JP2003111200

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DESCRIPTION JP2003111200
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for
example, a sound processing apparatus in which a speaker is provided in a headrest portion
mounted on a backrest portion of a chair.
[0002]
2. Description of the Related Art A reclining chair or the like having a headrest (head support
portion) provided with a speaker has come to be provided. As described above, by providing the
speaker in the headrest, the speaker can be provided in the vicinity of the listener's ear.
[0003]
As described above, by using a headrest provided with a speaker, high-quality sound is emitted
near the listener's ear and provided to the listener. . That is, even without using headphones or
the like, an environment in which a listener can listen to high-quality sound through a speaker
positioned near the listener's ear has been established.
[0004]
For example, when a speaker is provided in the headrest portion of a chair (seat), although high-
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quality sound can be emitted near the listener's ear, it is directly from the back of the listener's
ear Since the sound is emitted, the listener's consciousness is attracted to the back of the listener,
and depending on the music to be listened to, the sense of incongruity or so-called listening
fatigue may occur.
[0005]
For this reason, by performing sound image localization processing, the sound emitted from the
speaker behind the listener's ear can be heard against the audio signal so that it can be heard
from a previously assumed position such as the front of the listener. It is conceivable to perform
so-called sound image localization processing.
Positioned behind the listener's ear by performing sound image localization processing and
localizing the sound image of the sound emitted from the speaker located behind the listener's
ear to the listener's front or other assumed position It is possible to prevent discomfort and
tiredness by listening to the sound emitted from the speaker.
[0006]
In this case, what is important to localize the sound image of the sound emitted from the speaker
to the assumed position is from the speaker to the listener's ear in the reproduction sound field
where the sound is actually heard. Transfer function for the speech of With regard to the sound
emitted from the speaker after the sound image localization process, the sound image of the
sound emitted from the speaker can not be accurately localized at an assumed position unless
the influence of the transfer function in the reproduction sound field is removed.
[0007]
For this reason, the influence of the transfer function in the reproduction sound field is
eliminated by using the transaural system, which is one of the methods for strictly reproducing
the sound using the speaker, and the sound of the listener's ear is reduced. A sound image of
sound emitted from a speaker provided at, for example, a headrest located on the rear side can
be localized at an assumed position in front of the listener.
[0008]
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By the way, conventionally, only one headrest is provided in association with a chair or a seat,
and this is used in a fixed manner.
However, in the future, a wide variety of headrests will be provided that differ in shape, material,
speaker position, speaker performance and characteristics, etc., so that listeners can select and
use one that suits their preferences. It is possible to do.
[0009]
In addition to using a headrest provided with a speaker in a car seat and also using the same
headrest in a home chair, an audio system or audio visual of a headrest according to one's
preference may be used. It is also conceivable to share the system.
[0010]
However, in the headrest provided with the speaker, the transfer function is different if the
shape, the material, the position of the speaker, the performance or the characteristics of the
speaker, etc. are different.
For this reason, it is necessary to be able to perform transaural processing according to an
appropriate transfer function for each headrest that differs in shape, material, speaker position,
speaker performance, and characteristics.
[0011]
Also, strictly speaking, when a listener uses a headrest provided with a speaker, the positional
relationship between the speaker and the listener's ear varies depending on the use of the
headrest, and the headrest is always under the same conditions. It is difficult to listen to the
sound emitted from the speakers provided in.
[0012]
However, the position of the listener's head is forcibly regulated so that the listener's head
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position (ear position) is always the same position with respect to the speaker provided on the
headrest. It is not preferable to inhibit the listener's sense of relaxation.
In addition, since the head is not always in contact with the headrest, it is difficult to fix the
position of the listener's head relative to the speaker.
[0013]
In view of the above, the present invention is an audio processing apparatus which can be used
in various audio reproduction systems such as audio systems and audio visual systems to be
used, and can properly listen to reproduced speech. Furthermore, it is another object of the
present invention to provide an audio processing apparatus which can listen to a sound in an
appropriate state without discomfort, even if the positional relationship between the speaker and
the listener's ear is not always constant.
[0014]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the sound
processing apparatus according to the invention of claim 1 is directed to a speaker device and an
audio signal to be supplied to the speaker device. A sound image localization processing unit for
performing processing to localize a sound image of sound based on the sound signal at a
predetermined position; and the sound image based on processing information according to the
position of the head of the listener relative to the speaker device A correction processing unit
that performs correction processing on an audio signal from the localization processing unit, a
storage unit that stores and holds the processing information used by the correction processing
unit, and a storage unit that stores and holds the processing information And a control unit
configured to supply the processing information to the correction processing unit and control the
correction processing unit.
[0015]
According to the sound processing apparatus of the first aspect, the sound signal supplied to the
speaker device is localized by the sound image localization processing unit so that the sound
image of the reproduced sound by the sound signal is localized at a predetermined position. After
being processed, correction processing is performed in consideration of the speaker device and
the position of the listener's head (the position of the listener's ear), whereby the sound image of
the sound emitted from the speaker device is at a predetermined position. It is made to orientate.
[0016]
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In this case, it is information used for correction processing such as a function or coefficient used
in the correction processing unit, for example, the shape and material of the headrest provided
with the speaker device, the installation position of the speaker device, the speaker Processing
information corresponding to the performance, characteristics, etc. of the head is held in advance
in the storage unit, the processing information is supplied to the correction processing unit
through the control unit, and the headrest corresponding to the portion where the speaker is
provided The correction processing can be performed properly.
[0017]
Thus, even when, for example, a headrest provided with a speaker device is shared by a seat of a
car and a chair of a home, the sound image of the sound emitted from the speaker can be sent to
the listener in both of them. Thus, the sound can be localized at a predetermined position, and
the user can listen to the sound emitted without discomfort or tiredness.
[0018]
In addition, processing information corresponding to a transfer function to the ear of an
individual listener who is a purchaser who has a speaker device provided in the storage unit and
is to be measured, for example, when purchasing a headrest is stored. Thus, the sound emitted
from the speaker device can be provided to the listener best.
[0019]
According to a second aspect of the present invention, there is provided the sound processing
apparatus according to the first aspect, wherein in the storage unit, a possible position of the
head of the listener relative to the speaker device. The head processing unit further includes a
head position detection unit configured to store the processing information supplied to the
correction processing unit, and detecting a position of a listener's head relative to the speaker
device; The processing information of the storage unit determined in accordance with the
detection result from the head position detection unit may be supplied to the correction
processing unit to control the correction processing unit.
[0020]
According to the sound processing apparatus of the second aspect, the speaker device is
provided, for example, in the headrest, and when the headrest provided with the speaker device
is used, the head of the listener with respect to the speaker device The position of the (ear
position) is not always constant.
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At times of listening, the user will hear the sound emitted from the speaker device in the most
comfortable posture.
[0021]
Therefore, in the storage unit, the processing information corresponding to the transfer function
from the speaker device to the listener's ear at each of the plurality of possible positions of the
listener's head with respect to the speaker device It is stored in association with the position of.
Then, the head position detection unit detects the position of the head of the listener who is
trying to listen to the sound from the speaker device.
[0022]
Then, processing information corresponding to the listener's actual head position detected by the
head position detection unit by the control unit is read out from the storage unit, and this is
supplied to the correction processing unit and the listener is Correction processing is performed
according to the actual head position of
[0023]
Thus, even if the position of the listener's head (ear position) with respect to the speaker device is
not always at a constant position, the correction processing unit uses processing information
corresponding to the listener's head position. Since appropriate correction processing is
performed accordingly, the effect of sound image localization is not insufficient depending on the
position of the listener's head, and the speaker device is favorably released from the speaker
device without discomfort and without causing tiredness. It is made possible to listen to the
sound to be heard.
[0024]
According to a third aspect of the present invention, there is provided the sound processing
apparatus according to the first or second aspect, wherein at least the speaker device and the
storage unit are a plurality of units. It is characterized in that it is provided in a headrest which is
made detachable with respect to a backrest of a chair.
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[0025]
According to the sound processing apparatus of the third aspect, at least the speaker device and
the storage unit are provided in the detachable headrest, and the other parts such as the sound
image localization processing unit and the correction processing unit are the same. It is provided
in a portion other than the headrest such as a backrest portion of a chair to which the headrest
can be attached and a reproduction device of an audio signal.
[0026]
As a result, the storage unit in which the processing information corresponding to the shape and
material of the headrest, the installation position of the speaker device, etc. is stored is present
on the headrest side.
Then, when the headrest is mounted on various chairs and used, the processing information from
the storage unit provided in the headrest is provided to the correction processing unit to be
provided in a portion other than the headrest. The correction process according to the headrest
is properly performed, and the sound emitted from the speaker device provided in the headrest
can be listened favorably without causing discomfort and without causing tiredness.
[0027]
Further, since at least the sound image localization processing unit and the correction processing
unit are not provided in the headrest provided with the speaker device, the shape, the material,
and the installation position of the speaker device differ according to the listener's needs. Various
types of headrests can be provided more inexpensively, and listeners can select and use
headrests that suit their preferences.
Also, the headrest provided with the speaker device can be easily replaced as needed.
[0028]
According to a fourth aspect of the present invention, in the sound processing apparatus
according to the second aspect, the head position detecting unit may include an ultrasonic wave
transmitting means for transmitting an ultrasonic wave; Ultrasonic wave receiving means for
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receiving the reflected ultrasonic wave transmitted from the sound wave transmitting means and
reflected by the head of the listener, presence or absence of reception of the reflected ultrasonic
wave by the ultrasonic wave receiving means, and the ultrasonic wave receiving means Head
position that identifies the position of the head of the listener relative to the speaker based on the
velocity of the ultrasonic wave and the time from transmission of the ultrasonic wave to
reception as the reflected ultrasonic wave when the reflected ultrasonic wave is received It is
characterized in that it consists of specifying means.
[0029]
According to the sound processing apparatus of the fourth aspect, the presence or absence of the
reflected ultrasonic wave and the ultrasonic wave transmitted from the ultrasonic wave
transmitting means are reflected by the head of the listener and the ultrasonic wave receiving
means is used. The position of the listener's head with respect to the speaker device is specified
by the head position specifying means based on the time until reception and the speed of the
ultrasonic wave known in advance, and the head of the specified listener is specified. The control
unit controls the correction processing unit according to the position of the unit.
[0030]
As described above, by using the ultrasonic wave transmitting means and the ultrasonic wave
receiving means provided at a specific position with respect to the speaker device, the speaker
device and the listener who listens to the audio using the speaker device can The positional
relationship with the head is reliably and accurately detected, and based on this, appropriate
processing information to be used in the correction processing unit can be extracted from the
storage unit and used.
[0031]
According to a fifth aspect of the present invention, in the acoustic processing apparatus
according to the fourth aspect, the ultrasonic wave transmitting means and the ultrasonic wave
receiving means are in the high frequency range of the speaker device. It is characterized by
being a speaker.
[0032]
According to the sound processing apparatus of the fifth aspect, the ultrasonic wave transmitting
means and the ultrasonic wave receiving means for detecting the positional relationship between
the speaker device and the position of the head of the listener are the speaker device High-range
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speakers are used.
That is, the high sound range speaker itself is used as the ultrasonic wave transmission means
and the ultrasonic wave reception means.
[0033]
Thus, in order to detect the positional relationship between the speaker device and the head of
the listener, it is possible to use the existing high sound range speaker as an ultrasonic wave
without additionally providing an ultrasonic wave transmitting means and an ultrasonic wave
receiving means. The relationship between the speaker device and the head of the listener is
detected using the transmitting unit and the ultrasonic receiving unit, and processing information
corresponding to the position can be extracted from the storage unit and used.
[0034]
According to a sixth aspect of the present invention, in the acoustic processing apparatus
according to the fourth aspect, the ultrasonic wave transmission means is a high-range speaker
of the two-channel left and right speaker devices. The ultrasonic wave receiving means comprises
a plurality of ultrasonic wave sensing elements arranged at a predetermined position, and
transmitting high frequency sound waves of different frequencies from the high frequency range
speakers of the left and right two channels. It features.
[0035]
According to the sound processing apparatus of the sixth aspect, the high sound range speakers
of the left and right channel speaker devices are used as the ultrasonic wave transmission means,
and the ultrasonic wave reception means is, for example, the vicinity of the ultrasonic wave
transmission means. A plurality of ultrasonic sensing elements are arranged in a so-called array
structure to be used.
[0036]
Then, ultrasonic waves having different frequencies are transmitted from the high-range
speakers of the left and right channels, respectively, and the ultrasonic sensing element which
detects the reflected ultrasonic waves reflected by the head of the listener of the ultrasonic waves
is also used. In consideration, the position of the listener's head relative to the speaker device is
to be detected.
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Thereby, the positional relationship between the speaker device and the head of the listener is
more accurately detected, and processing information corresponding to the detected accurate
position of the head of the listener is extracted from the storage unit and used. To be able to
[0037]
The sound processing apparatus according to claim 7 is the sound processing apparatus
according to claim 2, wherein the head position detection unit listens to the sound through the
speaker device. It is characterized by comprising: image pickup means for picking up an image
including the head of the person; and image analysis means for analyzing the image picked up by
the image pickup means and detecting the position of the head of the listener relative to the
speaker device. I assume.
[0038]
According to the sound processing apparatus of the seventh aspect, the image pickup means
picks up an image including the head of the listener who is in a position to listen to the sound
through the speaker device, and the picked up image is an image The analysis means analyzes
the information so as to detect the positional relationship between the speaker device and the
head of the listener.
[0039]
Thus, the positional relationship between the speaker device and the head of the listener is
accurately detected based on the image including the head of the listener at the position where
the user listens to the sound through the speaker device. The processing information used in the
correction processing unit is extracted from the storage unit, and the correction processing in the
correction processing unit can be appropriately performed using this.
[0040]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a sound processing
apparatus according to the present invention will be described below with reference to the
drawings.
In the embodiment to be described below, for example, a sound processing apparatus in which a
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speaker device is mounted on a headrest that is detachable from both a seat of a car and a chair
used at home will be described as an example.
[0041]
First Embodiment FIG. 1 is a block diagram for explaining a sound processing apparatus 1 of a
first embodiment to which the present invention is applied, and FIG. 2 is a block diagram of the
first embodiment. It is a figure for demonstrating the external appearance of the chair in which
the sound processing apparatus of embodiment is used.
The sound processing apparatus 1 according to the first embodiment can process audio signals
of the left and right channels.
[0042]
In FIG. 1, a disc 100 is for providing audio signals of two channels (two-channel sound source (ch
is a channel abbreviation)).
The audio signals of the two left and right channels reproduced from the disc 100 are supplied to
the sound processing apparatus 1 of the first embodiment shown in FIG.
[0043]
For this reason, as shown in FIG. 1, the sound processing apparatus 1 according to the first
embodiment receives the left channel input signal Lin from the disc 100 serving as the 2ch
sound source and the left channel input terminal Lin. , And the right channel input terminal Rin
for receiving the supply of the audio signal of the right channel.
[0044]
As shown in FIG. 1, the sound processing apparatus 1 according to the first embodiment has a
sound image localization processing filter unit 10, a transaural system filter unit 20, and left and
right two-channel speaker devices. A left speaker (left channel speaker) SL, a right speaker (right
channel speaker) SR, a recording medium 30, and a CPU (central processing unit) 50 are
provided.
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[0045]
As the left and right speakers SL and SR, there may be one speaker each, or a so-called HiFi
speaker device capable of emitting high-quality sound provided with a super tweeter or a woofer.
It is possible.
In the case of the first embodiment, the left and right speakers SL, SR are HiFi speaker devices
provided with a super tweeter or a woofer.
[0046]
The sound processing apparatus according to the first embodiment including the left and right
speakers SL and SR can be detached from the seat of an automobile or the backrest of a chair
used at home, as shown in FIG. The headrest portion St3 is configured as described above.
Headrest part St3 is corresponded to the part (head support part) which supports a user's head
in the seat of a car, a chair used at home, etc., as shown in FIG.
[0047]
That is, as shown in FIG. 2, a so-called chair (seat) St such as a seat for a car or a reclining seat
used in a home can be roughly divided into a seat portion St1 which is a portion where a user
lays down The backrest portion St2 is a portion for holding the back of the person, and the
headrest portion St3 is a portion for supporting the head of the user.
[0048]
In the first embodiment, the sound processing apparatus shown in FIG. 1 includes the left and
right two-channel speakers SL and SR in a portion corresponding to the headrest portion St3
shown in FIG.
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And 2 from the audio reproduction device (car stereo device) installed in the car which
reproduces the audio signal from 2 channel sound source and the audio reproduction system
(audio reproduction device of home audio system or home theater system) provided in the home
It is arranged to be able to receive the respective supply of the audio signal of the channel.
[0049]
When the sound processing apparatus according to the first embodiment configured to be
configured in the headrest portion St3 is used, as can be understood from the view shown in FIG.
2, the headrest portion St3 is mounted. A listener (user) sitting on the chair St listens to the
emitted sound from the left speaker SL and the right speaker SR located diagonally behind his
head.
[0050]
Although the headrest portion is integrally formed with the backrest portion and some of the
headrest portion can not be removed, in this embodiment, as described above, a car seat or a
home chair as described above. And the like, and can be shared by a plurality of chairs.
[0051]
In the sound processing apparatus 1 of the first embodiment, the sound is shifted by shifting the
localization of the sound from the position of the actually fixed speaker to the position of the
virtual speaker. The sense of incongruity and discomfort caused by hearing from near the back of
the listener's head and behind the listener's ear is eliminated.
[0052]
That is, in the first embodiment, the sound emitted from the left speaker SL and the right speaker
SR by the sound image localization processing filter unit 10 and the transoral system filter unit
20 is shown in FIG. In FIG. 2, the left virtual speaker VSL and the right virtual speaker VSR
indicated by dotted lines are sounded to be emitted.
In other words, the sound image of the sound emitted from the real speakers SL and SR is
localized so as to feel like the one emitted from the virtual speakers VSL and VSR.
[0053]
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In the first embodiment, the virtual speakers VSL and VSR are virtual positions for localizing the
sound emitted from the left speaker SL and the right speaker SR, as shown in FIGS. As shown in
the diagram, when the head of the listener with respect to the headrest portion st3 is at a
predetermined position, the head position is set to a predetermined position in the forward
direction of the listener.
[0054]
As described above, the sound emitted from the left speaker SL and the right speaker SR of the
head rest portion St is localized as if the sound is emitted from the positions indicated by the left
and right virtual speakers VSL and VSR, so that the sound is generated. The sense of incongruity
and discomfort caused by hearing from near the back of the listener's head and the back of the
listener's ear is eliminated, and the listener can listen as a natural sound.
[0055]
Hereinafter, each part of the sound processing apparatus according to the first embodiment will
be described in detail.
First, in describing the sound image localization processing filter unit 10, the principle of the
sound image localization processing will be described.
FIG. 3 is a diagram for explaining the principle of the sound image localization process.
[0056]
As shown in FIG. 3, in a predetermined reproduction sound field, the position of the dummy head
DH is taken as the position of the listener, and the right and left to try to localize the sound image
for the listener at the position of the dummy head DH. The left real speaker SPL and the right
real speaker SLR are actually installed at the virtual speaker position (the position where it is
assumed that there is a speaker).
[0057]
Then, the sound emitted from the left real speaker SPL and the right real speaker SPR is collected
at both ears of the dummy head DH, and the sound emitted from the left real speaker SPL and
the right real speaker SPR is When reaching both ears of the dummy head DH, a transfer
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function (HRTF) indicating how it changes is measured in advance.
[0058]
As shown in FIG. 3, in the first embodiment, the transfer function of sound from the left real
speaker SPL to the left ear of the dummy head DH is M11, and the left real speaker SPL to the
dummy head DH. It is assumed that the transfer function of the sound to the right ear of is M12.
Similarly, it is assumed that the transfer function of sound from the right real speaker SPR to the
left ear of the dummy head DH is M21, and the transfer function of sound from the right real
speaker SPR to the right ear of the dummy head DH is M22.
[0059]
In this case, the transfer function measured in advance as described above with reference to FIG.
3 for the voice signal of the voice emitted from the speakers SL and SR of the headrest portion
St3 to be positioned near the listener's ear To process the voice signal to emit the processed
voice signal.
[0060]
Thus, the sound emitted from the speakers SL and SR of the headrest portion St3 is emitted as if
from the virtual speaker position (the position of the virtual speakers VSL and VSR in FIGS. 1 and
2). As a listener feels, the sound image of the sound emitted from the speakers SL and SR can be
localized.
[0061]
Although the dummy head DH is used to measure the transfer function (HRTF) here, the present
invention is not limited to this.
A human may be actually seated in the reproduction sound field for measuring the transfer
function, and a microphone may be placed near the ear to measure the transfer function of voice.
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[0062]
As described above, in order to localize the sound image at a predetermined position, the portion
for performing the processing by the transfer function of the sound to be measured in advance is
the sound image localization processing filter unit 10 shown in FIG.
The sound image localization processing filter unit 10 according to this embodiment can process
audio signals of two channels on the left and right, and as shown in FIG. 1, four filters 11, 12, 13,
14 and two filters It consists of the adders 15 and 16.
[0063]
The filter 11 processes the audio signal of the left channel supplied through the left input
terminal Lin with the transfer function M11, and supplies the processed audio signal to the
addition section 15 for the left channel.
The filter 12 processes the audio signal of the left channel supplied through the left input
terminal Lin with the transfer function M12, and supplies the processed audio signal to the
addition unit 16 for the right channel.
[0064]
The filter 21 processes the audio signal of the right channel supplied through the right input
terminal Rin with the transfer function M21, and supplies the processed audio signal to the
addition unit 15 for the left channel. .
The filter 22 processes the audio signal of the right channel supplied through the right input
terminal Rin with the transfer function M22, and supplies the processed audio signal to the
adding unit 16 for the right channel.
[0065]
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Thereby, the sound by the output sound signal from the left channel addition section 15 and the
sound by the output sound signal from the right channel addition section 16 are the left virtual
speaker VSL in FIGS. 1 and 2. The sound image is localized so as to be emitted from the right
virtual speaker VSR.
[0066]
However, as shown in FIG. 1, the sound emitted from the left speaker SL and the right speaker SR
provided in the headrest portion St3 is, as shown in FIG. Under the influence of the transfer
functions G11, G12, G21, and G22, there are cases where the sound image of the reproduced
sound can not be accurately localized at the intended virtual speaker position.
[0067]
Therefore, in the first embodiment, the transaural system filter unit 20 is used to perform
correction processing on the audio signal from the sound image localization processing filter unit
10, so that the left speaker can be realized. SL, The sound emitted from the right speaker SR is
localized as if it were emitted from the virtual speakers VSL and VSR on the left and right of the
virtual speaker position.
[0068]
The transaural system filter unit 20 is an audio filter formed by applying the transaural system.
The trans-aural system is a technology that attempts to realize the same effect as the binaural
system system, which is a system for strictly reproducing sound using headphones, even when a
speaker is used.
[0069]
The transoral system will be described by taking the case of FIG. 1 as an example. With regard to
the sounds emitted from the left speaker SL and the right speaker SR, the left and right listeners
of the sounds emitted from the respective speakers are referred to. By removing the influence of
the transfer functions G11, G12, G13, and G14 to the ear, the sound emitted from the left
speaker SL and the right speaker SR is strictly reproduced.
[0070]
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Therefore, the transaural system filter unit 20 shown in FIG. 1 removes the influence of the
transfer function in the reproduction sound field for the sound to be emitted from the left
speaker SL and the right speaker SR. The sound image of the sound emitted from the speaker SL
and the right speaker SR is localized at a position according to the virtual speaker position
accurately.
[0071]
Specifically, the transaural system filter unit 20 removes the influence of the transfer function
from the left speaker SL and the right speaker SR to the left and right ears of the listener by
making the right and left ears of the listener from the right speaker SR. It comprises filters 21,
22, 23, 24 for processing audio signals in accordance with the inverse function of the transfer
function up to the point, and adders 25, 26.
In the first embodiment, the filters 21, 22, 23, 24 perform processing in consideration of the
inverse filter characteristics so that more natural reproduced speech can be emitted.
[0072]
By the way, the transfer function from the speaker provided in the headrest portion St3 to the
listener's left and right ears varies depending on the shape, material, installation position of the
speaker device, performance and characteristics of the speaker, etc. of the headrest portion St3.
It will
That is, it can be said that the transfer function is different for each headrest portion St3 having a
different shape or the like in which the speaker device is provided.
[0073]
FIG. 4 is a view for explaining an example of a headrest portion St3 having a different shape
which is made detachable with respect to the backrest portion St2.
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As shown in FIG. 4, as a headrest portion detachable from the backrest portion St2, a box-shaped
headrest portion St31, an arc-shaped headrest portion St32 provided with speakers SL and SR on
the curved surface, and speakers SL and SR are provided. There are various types such as an
overhang-type headrest St33, a semicircular headrest 34, and the like, which have an overhang
and position the speakers SL and SR in the lateral direction of the listener's ear.
[0074]
As understood from FIG. 4, if the shape of the headrest portion is different, the positional
relationship between the speakers SL and SR provided in the headrest portion and the ears of the
listener changes, and the sound is emitted from the speakers Since the sound emission direction
of the sound also changes, the transfer function of the sound emitted from the speaker to the
listener's ear will be different.
In addition, even if the headrest portion has the same shape, the transfer function of the sound
emitted from the speaker to the listener's ear may change due to different sound absorption rates
if the material is different. Conceivable.
[0075]
Therefore, coefficient data obtained according to a transfer function in which the recording
medium 30, which is one of the components of the sound processing system constructed in the
headrest portion St3, is measured using the headrest portion St3. Coefficient data used in each of
the filters 21, 22, 23, 24 of the transaural system filter unit 20 in order to remove the influence
of the transfer function when listening to voice using the headrest portion St3. I will remember.
[0076]
At the time of sound reproduction, the CPU 40 supplies coefficient data for each filter of the
transaural system filter unit 20 stored in the storage medium 30 to each filter of the transaural
system filter unit 20.
As a result, the audio signal from the sound image localization processing filter 10 can be
subjected to appropriate correction processing according to the shape of the headrest portion
St3 or the like in the transaural system filter portion 20.
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[0077]
As described above, each of the filters 21, 22, 23, 24 of the transaural system filter section 20
has the shape, the material, the installation position of the speaker device, and the position of the
speaker device of the headrest St3 stored in advance in the recording medium. The filter
coefficients for each filter can be set through the CPU 40 according to the performance,
characteristics, etc., and processing according to the set coefficient data can be performed.
[0078]
The output audio signal from the left channel addition unit 15 of the sound image localization
processing filter unit 10 is supplied to the left channel filter 21 of the transaural system filter
unit 20 and the right channel filter 22. Also, the output sound signal from the right channel
addition unit 16 of the sound image localization processing filter unit 10 is supplied to the left
channel filter 23 of the transaural system filter unit 20 and the right channel filter 24. Ru.
[0079]
Each of the filters 21, 22, 23, 24 performs predetermined processing using the filter coefficients
from the CPU 40. Specifically, as described above, the speakers SL, SR are provided. The headrest
St3 is used to perform processing for removing the influence of the transfer function of the voice
to the listener's ear, which has been measured, on the voice signal supplied to the self-filter.
[0080]
Here, each filter of the transaural system filter 20 sets the coefficient data stored in the recording
medium 30 through the CPU 40 to obtain the transfer functions G1, G2, and G3 shown in FIG. ,
G4 by processing the audio signal, thereby removing the influence of the transfer functions G1,
G2, G3 and G4 in the reproduced sound field.
[0081]
The output from the filter 21 is supplied to the adder 25 for the left channel, and the output from
the filter 22 is supplied to the adder 26 for the right channel.
Similarly, the output from the filter 23 is supplied to the adder 25 for the left channel, and the
output from the filter 24 is supplied to the adder 26 for the right channel.
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[0082]
The adders 25 and 26 add the audio signals supplied thereto, the adder 25 supplies the audio
signal to the left speaker SL, and the adder 26 transmits the audio signal to the right speaker SR.
Supply.
As a result, the sound emitted from the speakers SL and SR of the headrest portion St3 is not
influenced by the transfer function according to the position of the head of the present listener in
the reproduction sound field, and the sound image is accurately left virtual. It is made to be able
to localize like the audio ¦ voice emitted from the speaker VSL and the right virtual speaker VSR.
[0083]
As described above, in the sound processing apparatus 1 according to the first embodiment, a
listener whose head is positioned in the vicinity of the headrest portion St3 provided with the
speakers SL and SR is the speaker SL of the headrest portion St3. , SR can be listened to as if it
were emitted from the virtual speaker positions VSL, VSR.
[0084]
Therefore, in spite of listening to the sound emitted from the left speaker SL and the right
speaker SR located diagonally behind the listener's head, the audio can be heard from the front of
the listener Sound so that the sound emitted from the left speaker SL and the right speaker SR
sticks to the back side of the listener and can be heard well without feeling discomfort or
discomfort Can.
[0085]
When the headrest St3 on which the sound processing apparatus 1 of this embodiment is
mounted is shared by, for example, a seat installed in a car and a chair placed in a home, In any
home, the sound image of the sound emitted from the speakers SL and SR of the headrest portion
St3 can be localized at a predetermined position with respect to the listener.
[0086]
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21
Therefore, by using the headrest portion St3 on which the sound processing apparatus 1
according to the first embodiment is mounted, the listener can be placed at a predetermined
position ahead of himself / herself in either a car or a home. It is possible to listen to the sound to
be localized.
That is, despite listening to the sound emitted from the speakers SL and SR of the headrest
portion St3 located behind the listener's ear, the sound does not feel like sticking to the back, and
You can make sure that you don't get tired of listening.
[0087]
Further, in the first embodiment, the front part of the components of the sound processing
apparatus 1 shown in FIG. 1, that is, the sound image localization processing filter 10, the
transoral system filter 20, the recording medium 30, the CPU 40, It has been described that the
front portions of the left and right two-channel speakers SL and SR are provided in the headrest
portion St3.
[0088]
In this case, the left and right audio signal output terminals of the audio reproduction apparatus
provided in the car and the audio reproduction apparatus provided in the home, and the left and
right audio signal input terminals of the audio processing process 1 By connecting them, it is
possible to listen to the sound subjected to the sound image localization processing using the
sound processing apparatus 1 without a sense of discomfort.
[0089]
However, it is not necessary to provide the front of the component parts of the sound processing
apparatus 1 shown in FIG. 1 in the headrest portion St3.
For example, the headrest portion St3 may be provided with at least two left and right channels
of speakers SL and SR and the recording medium 30, and the other components may be provided
in addition to the headrest portion St3.
[0090]
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22
FIG. 5 is a view for explaining an acoustic processing apparatus in which the left and right
speakers SL and SR and the recording medium 30 are provided in the headrest portion St3 and
the other components are not provided in the headrest St3. It is.
The sound processing apparatus shown in FIG. 5 is configured substantially the same as the
sound processing apparatus 1 shown in FIG.
[0091]
In the case of the sound processing apparatus shown in FIG. 5, the upper parts separated by the
dotted line, ie, the speakers SL and SR and the recording medium 30 are provided in the headrest
St3.
Then, the portions below the dotted line, that is, the portions other than the speakers SL and SR
and the recording medium 30, reproduce, for example, audio signals recorded in the sound
source such as the backrest St2 or the seat St1 or a disc. Provided on the audio playback device
side.
[0092]
By doing this, the sound image localization processing unit 10, the transoral system filter unit 20
and the like do not need to be mounted on the headrest portion St3, and the speaker which is
one of the components of the sound processing apparatus The provided headrest portion St3 can
be configured inexpensively.
Therefore, the listener can feel free to replace the headrest St3.
[0093]
Moreover, it is coefficient data to be supplied to each of the filters 21, 22, 23, 24 of the transaural system filter unit 20 provided at a place other than the headrest unit St3, and the headrest
St3 provided with the speakers SL, SR. The corresponding coefficient data is stored in the
recording medium 30 provided on the headrest St3 side.
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[0094]
Therefore, even if the headrest St3 is removed from, for example, a car seat and attached to a
chair in the home and used, the sound emitted from the speakers SL and SR of the headrest St3 is
transmitted to the listener. It can be localized at a predetermined position.
That is, a plurality of chairs share the headrest St3 such as a car seat and a chair in a home, and
the sound image of the sound emitted from the speakers SL and SR of the headrest portion St3 is
used in any of the chairs. It can be localized and provided to a listener at a predetermined
position.
[0095]
Even when the front portion of the sound reproducing apparatus 1 is provided in the headrest
portion St3, or in the case where the left and right speakers SL, SR and the recording medium 30
are provided in the headrest portion St3. When the headrest portion St3 is attached to a chair
(seat) to which the headrest portion St3 can be attached and detached, coefficient data is read
from the recording medium 30 by the CPU 40 and set in each filter of the transaural system filter
portion 20.
[0096]
When the headrest St3 is attached to a chair (seat), the audio reproduction device for
reproducing the sound from the sound source is connected to the left and right speakers SL and
SR, and the sound signal from the sound source is received. Sound image localization processing
and transaural processing can be performed to emit sound from the processed sound signal from
the left and right speakers SL and SR.
[0097]
The recording medium 30 is, for example, a semiconductor memory such as a ROM or an
EEPROM.
Further, as the recording medium 30, a recording medium such as a magnetic disk, an optical
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24
disk, a magneto-optical disk or the like can be used.
[0098]
[Modification of First Embodiment] FIG. 6 is a block diagram for explaining a modification of the
sound processing apparatus of the first embodiment.
As shown in FIG. 6, the sound processing apparatus 2 of this example is the same as the first
shown in FIG. 1 except that a simplified transaural system filter unit 50 is mounted instead of the
transaural system filter unit 20. It is comprised similarly to the sound processing apparatus 1 of
embodiment.
Therefore, in the sound processing apparatus 2 shown in FIG. 6, the same reference numerals are
given to the parts configured in the same manner as the first sound processing apparatus 1
shown in FIG. 1, and the detailed description is omitted. .
[0099]
As shown in FIGS. 1, 2 and 6, the speakers SL and SR provided in the headrest St3 and the head
of the listener are generally close to each other, and the speakers SL and SR of the headrest St3
are And the crosstalk component from the speaker SL, SR to the opposite ear is much smaller
than the audio signal component from the speaker SL, SR to the ear corresponding to the speaker
due to the nature close to the listener's ear .
[0100]
That is, in the example shown in FIG. 1, since the transfer functions G12 and G21 of the crosstalk
component are much smaller than the transfer functions G11 and G22, the transfer functions
G12 and G21 of the crosstalk component should be ignored. it can.
For this reason, a simplified transaural system filter unit 50 shown in FIG. 6 is one that is
simplified by omitting the consideration of the crosstalk component from a normal transaural
system.
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25
[0101]
As shown in FIG. 6, this simplified transaural system filter section 50 is provided in the headrest
section St3 and is an inverse function of the sound transfer function G1 from the left speaker SL
to the left ear of the listener. A filter 51 for processing and a filter 52 for processing an audio
signal with an inverse function of a transfer function G2 of audio from the right speaker SR
provided in the headrest portion St3 to the right ear of the listener are provided.
As described above, even if the crosstalk component is ignored, it has been experimentally
confirmed that the localization of the sound emitted from the left and right speakers SL and SR
becomes the virtual speaker position.
[0102]
Then, for each of the two filters 51 and 52 of the simplified transaural system filter unit 50, the
left and right two-channel loudspeakers SL are provided similarly to the case of the sound
processing apparatus 1 described above with reference to FIG. , SR is supplied with coefficient
data according to a transfer function that is to be measured using a headrest unit.
The coefficient data is stored in advance in the recording medium 30 as in the case of the sound
processing apparatus 1 described above, and is supplied to the filters 51 and 52 of the simplified
transaural system filter 50 through the CPU 40.
[0103]
In this case, the coefficient data prepared in the recording medium 30 may be only for the filters
51 and 52, so the amount of data stored and held in the recording medium 30 can be reduced.
Therefore, a medium having a small storage capacity can be used as the recording medium 30.
Moreover, in the case of the sound processing apparatus 2 shown in FIG. 6, the configuration of
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26
the sound processing apparatus can be simplified by using the simplified transaural system filter
unit 50.
[0104]
Also in the case of the sound processing apparatus 2 shown in FIG. 6, as in the case of the sound
processing apparatus 1 of the first embodiment shown in FIG. In spite of listening to the sound
emitted from the left speaker SL and the right speaker SR located at the, the sound is made to be
heard from the front direction of the listener, so the sound is released from the left speaker SL
and the right speaker SR. It is possible to listen to the sound well without feeling discomfort or
discomfort such as the sound to be heard sticking to the back side of the listener.
[0105]
Second Embodiment FIG. 7 is a block diagram for explaining a sound processing apparatus 3
according to a second embodiment of the present invention.
The audio processing device 3 of the second embodiment can process audio signals from multichannel media such as DVD, for example, and in the second embodiment, audio of 5 channels is
processed. It is capable of processing signals.
[0106]
As shown in FIG. 7, the sound processing apparatus 3 according to the second embodiment
includes input terminals i1 to i5 for audio signals of five channels, and, for example, from a multichannel recording medium such as a DVD. It can receive the input of audio signals for 5
channels.
The sound processing apparatus 3 shown in FIG. 7 is provided with speakers SL and SR for the
two right and left channels, a recording medium 30, a CPU 40, a simplified transaural system
filter 50, and a sound image localization processing filter unit 60.
[0107]
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27
As in the case of the sound processing apparatus 1 of the first embodiment, the sound processing
apparatus 3 of the second embodiment is also configured as a headrest portion St3 that can be
attached to and detached from various chairs (seats). It is something to be done.
Further, as can be understood from FIG. 7, in the sound processing device 3 of the second
embodiment, the components other than the sound image localization processing filter unit 60
are the sound processing device 2 of the modification of the first embodiment and It is
constructed similarly.
[0108]
The sound image localization processing filter unit 60 of the sound processing apparatus 3 of the
second embodiment is basically the same as the sound image localization processing filter unit
10 of the sound processing apparatus of the first embodiment. On the basis of the principle of
the above, the sound image of the sound emitted from the speaker is localized.
[0109]
However, in the sound processing apparatus 3 of the second embodiment shown in FIG. 7, the
sound image of the sound emitted from the left and right speakers SL and SR provided in the
headrest portion St3 is shown in FIG. The sound is localized as emitted from the five virtual
speakers VS1 to VS5 indicated by dotted lines.
[0110]
FIG. 8 is a view for explaining the principle of the sound image localization processing filter unit
60 of the sound processing apparatus 3 of the second embodiment shown in FIG.
As shown in FIG. 8, in a predetermined reproduction sound field, a virtual speaker position where
the position of the dummy head DH is the position of the listener and the listener at the position
of the dummy head DH tries to localize the sound image The actual speakers SP1 to SP5 are
actually installed at the position where it is assumed that there are speakers.
Then, transfer functions (HRTFs) to the left and right ears of the dummy head DH of the sound
emitted from each of the actual speakers SP1 to SP5 are measured in advance.
10-05-2019
28
[0111]
As shown in FIG. 8, in the second embodiment, the transfer function of the sound from the real
speaker SP1 to the left ear of the dummy head DH is N11, and the right ear of the real speaker
SP1 to the right ear of the dummy head DH. The transfer function of up to speech is N12.
The transfer function of sound from the real speaker SP2 to the left ear of the dummy head DH is
N21, and the transfer function of sound from the real speaker SP2 to the right ear of the dummy
head DH is N22.
[0112]
Similarly, the transfer functions of the sound from the real speaker SP3 to the left and right ears
of the dummy head DH are N31 and N32, and the sound transfer from the real speaker SP4 to
the left and right ears of the dummy head DH The functions are N41 and N42.
The transfer functions of the sound from the actual speaker SP5 to the left and right ears of the
dummy head DH are N51 and N52.
[0113]
The audio signal input from each of the input terminals i1 to i5 is processed using the
corresponding transfer function measured in advance as described with reference to FIG. A
correction process is performed to remove the influence of the sound, and the sound based on
the sound signal after the process is supplied to the left and right speakers SL and SR provided in
the headrest portion St3 so that the sound is emitted.
[0114]
In this manner, the viewer can hear the sound emitted from the speakers SL and SR of the
headrest portion St3 as if the sound is emitted from the position indicated by the virtual speakers
VS1 to VS5 indicated by the dotted line in FIG. To make it possible to localize the sound image so
that
10-05-2019
29
[0115]
Then, in order to localize the sound image, the portion that performs processing with the transfer
function of the voice measured in advance is the sound image localization processing filter unit
60 shown in FIG. 7, which eliminates the influence of the transfer function in the reproduced
sound field. The part which performs the correction process for performing is a simplified
transaural system filter 50 as in the case of the modification of the first embodiment described
above.
[0116]
First, with regard to the sound image localization processing filter unit 60 of the second
embodiment, as described above, the sound image localization processing filter unit 60 can
process sound signals of five channels. Thus, as shown in FIG. 7, it comprises ten filters 61 to 70
and two adders 71 and 72.
[0117]
The filter 61 processes the audio signal supplied through the terminal i1 with the transfer
function N11, and supplies the processed audio signal to the left channel adder 71.
The filter 62 processes the audio signal supplied through the terminal i2 with the transfer
function N12, and supplies the processed audio signal to the addition unit 72 for the right
channel.
[0118]
The filter 63 processes the audio signal supplied through the terminal i2 with the transfer
function N21, and supplies the processed audio signal to the left channel adder 71.
The filter 64 processes the audio signal supplied through the terminal i2 with the transfer
function N22, and supplies the processed audio signal to the addition unit 72 for the right
channel.
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30
[0119]
The filter 65 processes the audio signal supplied through the terminal i3 with the transfer
function N31, and supplies the processed audio signal to the left channel adder 71.
The filter 66 processes the audio signal supplied through the terminal i3 with the transfer
function N32, and supplies the processed audio signal to the adding unit 72 for the right
channel.
[0120]
The filter 67 processes the audio signal supplied through the terminal i4 with the transfer
function N41, and supplies the processed audio signal to the left channel adder 71.
The filter 68 processes the audio signal supplied through the terminal i4 with the transfer
function N42, and supplies the processed audio signal to the right channel addition unit 72.
[0121]
The filter 69 processes the audio signal supplied through the terminal i5 with the transfer
function N51, and supplies the processed audio signal to the left channel adder 71.
The filter 70 processes the audio signal supplied through the terminal i5 with the transfer
function N52, and supplies the processed audio signal to the right channel addition unit 72.
[0122]
Thus, the sound based on the output sound signal from left channel addition section 71 and the
sound based on the output sound signal from right channel addition section 72 are indicated by
the virtual speakers VS1 shown by dotted lines in FIG. The sound image is localized so as to be
emitted from the position of VS5.
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31
[0123]
Also in the case of the sound processing device 3 of the second embodiment, as in the case of the
sound processing devices 1 and 2 of the first embodiment, the left speaker provided in the head
rest portion St3 The sound emitted from the SL and the right speaker SR is localized at a virtual
speaker position aimed at the sound image of the reproduced sound under the influence of the
transfer function in the actual reproduced sound field even if the sound image localization
processing is performed It is thought that there are cases where it is impossible to
[0124]
Therefore, also in the sound processing device 3 of the second embodiment, the left and right
speakers SL and SR of the headrest portion St3 are used by using the simplified transaural
system filter unit 50 in which the crosstalk component is not taken into consideration. The sound
image of the sound emitted from the speaker is accurately localized at each position of each of
the virtual speakers VS1 to VS5.
[0125]
Also in the case of the sound processing apparatus 3 of the second embodiment, in the simplified
transaural system unit 50, the sound processing apparatus 2 of the modification of the first
embodiment described above with reference to FIG. Similarly to the above case, the coefficient
data stored in the storage medium 30 is supplied through the CPU 40 and determined according
to the transfer function according to the headrest portion St3 provided with the speakers SL and
SR, and the speaker SL in the reproduction sound field is It is possible to remove the influence of
the sound transfer function from SR to the listener's ear.
[0126]
In recent years, media having multi-channel sound sources, such as DVDs, have also become
popular, and it is possible to process 5-channel audio signals as in the sound processing
apparatus 3 of the second embodiment. As a result, it is possible to obtain a virtual five-channel
sound image through the two speakers SL and SR of the headrest portion St3 and enjoy powerful
reproduced sound.
[0127]
Also in the case of the second embodiment, according to the transfer function from the left and
right speakers SL, SR to the listener's ear when the headrest provided with the left and right
speakers SL, SR is used. In order to remove the influence of the transfer function, coefficient data
to be supplied to the filters 51 and 52 of the simplified transaural system filter unit 50 is
prepared in the storage medium 30 in advance.
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32
[0128]
Thus, when the headrest St3 in which the sound processing apparatus 3 of the second
embodiment shown in FIG. 7 is configured to be shared by a plurality of chairs (seats), which
chair (seat) will be used. In addition, even when the headrest St3 configured as the sound
processing apparatus 3 according to the second embodiment is attached and used, a sound is
provided to the listener such that the sound image is localized at a predetermined position. be
able to.
[0129]
In the sound processing apparatus 3 of the second embodiment, the simplified transaural system
filter 50 is replaced with the same as the sound processing apparatus 1 of the first embodiment
shown in FIG. Alternatively, the transoral system filter unit 20 may be used.
In this case, coefficient data corresponding to the headrest portion St3 may be set to four for
each of the filters 21, 22, 23, and 24.
[0130]
Also in the case of the sound processing device 3 of the second embodiment, at least the left and
right speakers SL, SR and the storage medium 30 are provided in the headrest portion St3, and
the other portions are the headrest portion St3. For example, it may be provided on the backrest
St2, on the side of the sound reproducing device, or between the sound reproducing device and
the left and right speakers SL and SR.
[0131]
As described above, by providing the headrest portion with only the minimum necessary portion
of the components of the sound processing device 3, the headrest portion that constitutes a part
of the sound processing device 3. Can be configured inexpensively.
Thereby, the user can respond to the user's request, such as being able to easily replace the
headrest portion provided with the speaker.
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33
[0132]
Third Embodiment For example, in the case of the sound processing apparatus 1 described above
with reference to FIG. 1, the virtual speakers VSL, the positional relationship from the virtual
speaker position indicated by VSR to the listener's both ears, If the positional relationship from
the speakers SL and SR to the listeners ears changes greatly between the transfer function
measurement and the system reproduction (when actually reproducing and listening to the
audio), each transfer function It is thought that the effect of the localization of the sound image
to the virtual speaker position may be diminished.
[0133]
Specifically, for example, in the case of the sound processing apparatus 1 shown in FIG. 1, the
transfer function from the left and right speakers SL, SL provided in the headrest portion St3 to
the listener's ear is transmitted When the listener's head is located at the position of the
functions G11, G12, G21, and G22, the listener is a virtual speaker for the sound emitted from
the left and right speakers SL and SR provided in the headrest portion St3. It can be heard as if
emitted from VSL and VSR.
[0134]
However, if the position of the head of the listener relative to the left and right speakers SL and
SR provided in the headrest portion St3 deviates from the assumed position, the left and right
speakers SL and SR provided in the headrest portion St3 The transfer function from the point to
the ear of the listener changes.
For this reason, the influence of the transfer function in the reproduction sound field can not be
reliably removed, and the virtual speaker localization effect of causing the sound image of the
sound emitted from the speakers SL and SR to be localized at the virtual speaker position is
sufficient. Can not be obtained.
[0135]
In particular, when the listener's head moves in the direction orthogonal to the sound emission
surface of the speaker, in the case where it moves in the vertical and horizontal directions
parallel to the sound emission surface of the speaker. The effect is greater than (when
approaching the speaker or when moving away from the speaker).
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34
[0136]
For this reason, in order to obtain the effect of virtual speaker localization sufficiently, the user is
required to listen to the sound so that the position of the listener's head (ear position) with
respect to the speaker is always determined, or It is desirable to measure the transfer functions
at various head positions of the listener and to reproduce the speech in a system that has a
transfer function or inverse filter that is appropriate for that position.
[0137]
However, it is difficult to always keep the position of the head of the listener who sits on the
chair having the headrest portion St3 at a predetermined position with respect to the speaker.
In addition, even if it is possible to hold it, it may also interfere with the listener's sense of
relaxation.
[0138]
Therefore, in the third embodiment, for example, the position of the listener's ear relative to the
speaker when the sound processing apparatus is in operation or when an instruction is given
from the listener. In other words, the position of the listener's head relative to the headrest unit
including the distance of the listener's head from the headrest unit provided with the speaker is
measured.
[0139]
Then, a plurality of coefficient data corresponding to a plurality of positions that the head of the
listener can take for the headrest St3 are prepared in advance in the recording medium 30, and
the head position of the listener is measured. The sound data is localized according to the latest
position of the listener's head by reading out the coefficient data from the storage medium 30
and supplying it to a filter for removing the influence of the transfer function in the reproduction
sound field. It is possible to apply an appropriate correction process to an audio signal of
[0140]
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35
FIG. 9 is a block diagram for explaining the sound processing apparatus 4 according to the third
embodiment.
The sound processing device 4 according to the third embodiment is also configured as a
headrest portion St3 which is attachable to and detachable from a plurality of chairs (seats).
[0141]
In the sound processing apparatus 4 shown in FIG. 9, the super tweeter of the speaker device
provided in the headrest portion St3 is used as a position detection sensor of the head of the
listener.
In recent years, the trend toward HiFi for reproduction audio has advanced, and it is not
uncommon to implement a speaker having reproduction performance beyond the audio
frequency band, so this is used.
[0142]
That is, the super tweeters of the speakers SL and SR of the sound processing apparatus 4
according to the third embodiment have a reproduction capability higher than the audible
frequency, and the listener (speaker device) of this configuration is a listener. By using it for
measuring the position of the head, it is not necessary to mount a dedicated sensor system such
as a pressure-sensitive type in order to detect the position of the listener's head.
[0143]
Specifically, an ultrasonic wave is transmitted from the speaker super tweeter which is also
received by the head rest portion St3, and the reflected wave (reflected ultrasonic wave) from the
head of the listener of the transmitted ultrasonic wave is transmitted to the super tweeter. And a
head position detection unit (hereinafter simply referred to as a detection unit).
The analysis at 80) detects the position of the listener's head relative to the headrest St3.
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36
[0144]
As described above, super tweeters of the left and right speakers SL and SR provided in the
headrest portion St3 are used as position detection sensors for detecting the position of the head
of the listener, and the head of the listener relative to the headrest portion St3. The sound
processing apparatus 4 of the third embodiment shown in FIG. 9 is substantially the same as the
sound processing apparatus 1 of the first embodiment except that a detection unit 80 for
detecting the position of the unit is provided. It is constructed similarly.
[0145]
Therefore, in the sound processing apparatus of the third embodiment shown in FIG. 9, the same
reference numerals are given to the parts configured similarly to the sound processing apparatus
1 shown in FIG. Detailed description will be omitted.
[0146]
Then, as described above, in the sound processing apparatus 4 of the third embodiment,
ultrasonic waves of a predetermined frequency are transmitted from the supertweeters of the
speakers SL and SR provided in the headrest portion St3, The reflection from the head of the
listener of this ultrasonic wave is mainly received through the super tweeters of the speakers SR
and SL of the headrest portion St3.
[0147]
Then, the presence or absence of reception of the reflected wave of the ultrasonic wave
transmitted from the super tweeter, and the time taken from the transmission of the ultrasonic
wave to the reception of the reflected wave, when the reflected wave is received, The position of
the listener's head relative to the headrest St3 is detected based on the distance between the
speaker and the listener obtained from time and ultrasonic velocity.
[0148]
FIG. 10 is a diagram for explaining the process of detecting the position of the head of the
listener performed in the sound processing apparatus 4 according to the third embodiment.
As shown in FIG. 10, ultrasonic waves of 40 kHz are transmitted from the supertweeters of the
left and right speakers SL and SR of the headrest portion St3 and the reflected waves from the
head of the user of the ultrasonic waves are similarly transmitted to the left and right of the
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37
headrest portion St3. The speakers SL and SR receive by the super tweeter.
[0149]
The control of the transmission of ultrasonic waves from the supertweeters of the left and right
speakers SL and SR is controlled by, for example, the CPU 40.
The ultrasonic waves received by the supertweeters of the left and right speakers SL and SR are
supplied to the detection unit 80.
When the detection unit 80 receives the presence or absence of a 40 kHz ultrasonic wave
(reflected wave) or the 40 kHz ultrasonic wave (reflected wave), the time taken from
transmission to reception of the ultrasonic wave, the speed of the ultrasonic wave, etc. The
position of the head of the listener relative to the left and right speakers SL and SR of the
headrest portion St3 is detected.
[0150]
That is, as shown in FIGS. 4A and 4B, when each of the speakers SL of the headrest St3 and the
supertweeter of the SR similarly receives the reflected waves of the ultrasonic waves transmitted
in the same manner, the transmission is performed. The position of the head of the listener
relative to the headrest St3 can be detected in accordance with the time taken from the time to
the time of reception.
[0151]
Briefly, for example, as shown in FIG. 4A, when the time taken from transmission to reception of
ultrasonic waves is relatively long, the listener's head is compared with the headrest St3. It can
be seen that it is located at a distant position.
Further, as shown in FIG. 4B, when the time taken from transmission to reception of the
ultrasonic wave is relatively short, the position of the head of the listener is positioned relatively
close to the headrest St3. You can see that
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[0152]
Also, as shown in FIG. 4C, for example, only the supertweeter of the left speaker SL receives an
ultrasonic wave similarly transmitted from the supertweeters of the left and right speakers SL
and SR provided in the headrest portion St3. If the SR supertweeter does not receive 40 kHz
ultrasound, it can be seen that the listener's head is offset to the left relative to the headrest St3.
[0153]
Conversely, for example, only the super tweeter of the right speaker SR receives ultrasonic waves
transmitted similarly from the super tweeters of the left and right speakers SL and SR provided in
the head rest portion St3, and the super tweeter of the left speaker SL If the 40 kHz ultrasonic
wave is not received, it can be seen that the listener's head is offset to the right with respect to
the headrest St3.
[0154]
As described above, based on the reflected waves from the head of the listener of the ultrasonic
waves transmitted from the left and right speakers, the detection unit 40 determines the distance
from the speakers SL and SR of the headrest St3 and the left and right offsets. (Separation) etc.
can be sensed.
In this case, the position of the listener's head is detected, for example, as a deviation (offset)
from the reference position where the listener's head should be located, and this is notified to the
CPU 40.
[0155]
Then, based on the detection result of the position of the head of the listener from the detection
unit 80, the CPU 40 refers to the coefficient data table recorded in the recording medium 30, and
detects the current head of the listener. The coefficient data to be supplied to the filters 21, 22,
23, 24 of the transaural system filter unit 20 according to the position is read out.
[0156]
In the third embodiment, the recording medium 30 is coefficient data to be supplied to each of
the filters 21, 22, 23, 24 of the transaural system filter unit 20, which corresponds to the
headrest unit St3. A plurality of coefficient data corresponding to a plurality of possible positions
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39
of the listener's head are stored in association with each position.
[0157]
That is, the transfer functions of the sound emitted from the speakers SL and SR of the headrest
portion St3 to the listener's left and right ears are measured in advance by changing various
positions of the listener's head with respect to the headrest portion St3. Based on the
measurement results, coefficient data used in each of the filters 21, 22, 23, 24 of the transaural
system filter unit 20 is determined, and the determined coefficient data is correlated with the
position of the head of the listener. The attached data is stored in the recording medium 30.
[0158]
Accordingly, in the recording medium 30, the position data of the listener's head is coefficient
data used in each of the filters 21, 22, 23, 24 of the transaural system filter unit 20 at the
position A, and the transformer at the position B. The coefficient data used by each of the filters
21, 22, 23, 34 of the oral system filter unit 20, ..., filters at each position of the head of the
listener whose position is changed with respect to the headrest unit St3. The coefficient data
used by 21, 22, 23, 24 is stored.
[0159]
The CPU 40 records coefficient data to be supplied to each of the filters 21, 22, 23, 24 of the
transaural system filter unit 20 based on the detection result of the current position of the user's
head from the detection unit 80. The data is read from the medium 30 and supplied to the
corresponding filter of the transaural system filter unit 20.
[0160]
Thus, even if the position of the head of the listener moves relative to the headrest St3, the actual
position of the head of the listener is measured, and the transfer function in the reproduced
sound field is determined according to the position. The transaural system filter unit 20 can
perform correction processing so as to remove the influence.
Therefore, the sound images of the sounds emitted from the left and right speakers SL and SR of
the headrest portion St3 can be localized at the virtual speaker position regardless of the position
of the head of the listener.
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40
[0161]
Moreover, since the coefficient data stored in the storage medium 30 corresponds to the
headrest portion St3 of the sound processing apparatus 4 of the third embodiment, the headrest
portion St3 is Even when this is mounted on any removable chair (seat) and used, the listener can
hear the sound image of the sound emitted from the left and right speakers SL and SR provided
on the headrest St3. It can be localized at a predetermined position.
[0162]
In the third embodiment, the recording medium 30 is transoral corresponding to each position of
the head based on the transfer function measured at each position that the head of the listener
can take. A function to be set to each filter of the system filter unit 20 may be obtained, and this
function and the position of the head may be associated and stored.
That is, the function itself used for correction may be stored in the recording medium 30 in
association with the position of the head, and this may be set in the target filter of the transaural
system filter unit 20.
[0163]
Also, for example, the transfer function at the reference position is measured, and necessary
parameters such as amplitude adjustment parameters and delay processing parameters for the
reference transfer function are set, and detection is performed based on the reference
parameters. Depending on the actual position of the listener's head to be performed, new
parameters may be obtained and set for each filter.
[0164]
That is, by setting one transfer function model and making adjustments to this model according
to the position of the listener's head, it is possible to respond to the listener's actual head
position. The correction process can also be performed on the audio signal.
In this case, if a parameter that can be placed at the reference position is held in a program
executed by the CPU, for example, as a reference model, no memory is required to hold the
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41
parameters, and only the reference parameter is stored in memory. If it is stored in the memory,
a memory with a large storage capacity will not be necessary.
[0165]
As described above, as processing information accumulated in the recording medium 30 and
supplied to each filter of the transaural system filter unit 20, there are a plurality of types such
as coefficient data, function data, parameter data, etc. However, these may be used in accordance
with the respective filter circuits to be actually mounted on the sound processing apparatus.
[0166]
In the third embodiment, the transaural system filter unit 20 is used, but the present invention is
not limited to this.
For example, as shown in FIG. 11, by using a simplified transaural system filter unit 50 instead of
the transaural system filter unit 20, it is possible to configure the sound processing device 5
having a good configuration simplified.
In this case, the data to be stored in advance in the storage unit 30 can be approximately half
that of the sound processing apparatus 4 of the third embodiment shown in FIG.
[0167]
Also, in place of the two-channel sound image localization processing filter 10, multi-channel
sound image localization processing filters such as the five-channel sound image localization
processing unit 50 shown in FIG. 7 can be used.
[0168]
Also in the case of the sound processing apparatus 4 shown in FIG. 9 and the sound processing
apparatus 5 shown in FIG. 11 of the third embodiment, the left and right speakers SL, SR and the
recording medium 30 The headrest portion St3 may be provided, and the other portions may be
provided on the backrest portion St2, the sound reproducing device side, or between the
speakers SL and SR and the sound reproducing device.
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42
[0169]
In such a case, an inexpensive headrest portion St3 provided with a speaker can be configured,
and various headrest portions different in shape, material, speaker installation position and the
like can be provided. You can purchase and use something that suits your taste.
[0170]
Fourth Embodiment By the way, in order to realize an audio processing apparatus capable of
providing higher quality voice, the detection accuracy of the position of the head of the listener
relative to the headrest portion is raised, and an audio signal is obtained. There is a demand that
the correction process by the transaural system can be performed more strictly.
[0171]
Therefore, also in the sound processing apparatus of the fourth embodiment, the ultrasonic
waves for detecting the position of the head of the listener are the same as the sound processing
apparatuses 4 and 5 of the third embodiment described above. In the same manner as in the
above case, the super tweeters of the speakers SL and SR provided in the headrest portion St3
transmit.
[0172]
However, in the sound processing apparatus according to the fourth embodiment, the reflected
wave of the transmitted ultrasonic wave is received by the headrest portion St3 or a plurality of
ultrasonic wave receiving elements provided in the vicinity thereof. The position of the listener's
head can be detected more accurately.
[0173]
FIG. 12 is a block diagram for explaining the sound processing apparatus 6 according to the
fourth embodiment.
As shown in FIG. 12, in the sound processing apparatus according to the fourth embodiment, a
plurality of ultrasonic receiving elements (ultrasonic sensing elements) are provided, for example,
in the headrest portion St3 or in the vicinity thereof, The configuration is the same as that of the
acoustic processing device 1 of the first embodiment shown in FIG. 1 except that a head position
detection unit 80A for receiving a detection output from an element is provided. In the sound
processing apparatus 6 of the fourth embodiment shown in FIG. 12, the parts configured in the
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43
same manner as the sound processing apparatus 1 of the first embodiment shown in FIG. 1 are
the sound of the first embodiment. The same reference numerals as those of the processing
apparatus 1 are given, and the explanation of the parts will be omitted.
[0174]
In the case of the sound processing apparatus 6 according to the fourth embodiment shown in
FIG. 12, six ultrasonic wave receiving elements (hereinafter referred to simply as receiving
elements) are provided in or near the headrest portion St3.
) SS1 to SS6 are provided in an array.
Then, ultrasonic waves with different frequencies are transmitted from the supertweeter of the
left channel SL and the supertweeter of the right channel SR, and the reflected waves are
received by the receiving elements SS1 to SS6, and the detecting unit 80A is based on the
detection output. Makes it possible to more accurately detect the position of the listener's head.
[0175]
FIG. 13 is a diagram for explaining the process of detecting the position of the head of the
listener performed in the sound processing apparatus 6 according to the fourth embodiment.
As shown in FIG. 13, ultrasonic waves of different frequencies are transmitted from the left and
right speakers SL and SR whose sound emission faces are directed in the direction in which the
head of the listener originally lies, and the listener of the transmitted ultrasonic waves The
reflected waves from the head of the head are received by the receiving elements SS1 to SS6.
[0176]
In the case of the example shown in FIG. 13, an ultrasonic wave with a frequency of 40 kHz is
transmitted from the supertweeter of the left speaker SL, and an ultrasonic wave with a
frequency of 50 kHz is transmitted from the supertweeter with the right speaker SR. I have to.
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44
By doing this, the accuracy of position detection is further improved.
[0177]
Then, as shown in FIG. 13A, none of the receiving elements SS1 to SS6 provided in the headrest
portion St3 can receive the reflected waves of the ultrasonic waves transmitted from the
supertweeters of the left and right speakers SL and SR. In this case, the position of the listener's
head can be detected as being at a position separated from the headrest portion St3 by a
predetermined distance or more.
[0178]
Also, as shown in FIG. 13B, the reflected wave from the head of the listener of the ultrasonic
wave transmitted from the supertweeter of the left speaker SL, that is, the ultrasonic wave of 40
kHz is received by the receiving element SS3 and The reflected wave from the head of the
listener of the ultrasonic wave transmitted from the supertweeter of the right speaker SR, that is,
the ultrasonic wave of 50 kHz is received by the receiving element SS1, the position of the head
of the listener is the headrest It can detect that it is in the position by the left speaker SL side of
part St3.
[0179]
Also, although not shown, contrary to the case of FIG. 13B, the reflected wave from the head of
the listener of the ultrasonic wave transmitted from the supertweeter of the left speaker SL, ie,
the ultrasonic wave of 40 kHz is the receiving element SS6. And the reflected wave from the head
of the listener of the ultrasonic wave transmitted from the supertweeter of the right speaker SR,
that is, the ultrasonic wave of 50 kHz is received by the receiving element SS4, the head of the
listener Can be detected as being located by the right speaker SL side of the headrest portion St3.
[0180]
Further, as shown in FIG. 13C, the reflected wave from the head of the listener of the ultrasonic
wave transmitted from the supertweeter of the left speaker SL, that is, the ultrasonic wave of 40
kHz is received by the receiving element SS3 and When the receiving element SS4 receives a
reflected wave from the head of the listener of the ultrasonic wave transmitted from the
supertweeter of the right speaker SR, that is, an ultrasonic wave of 50 kHz, the position of the
head of the listener is the headrest portion It can be detected that it is in the middle position of
the left and right speakers SL and SR of St3.
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[0181]
As described above, ultrasonic waves of different frequencies transmitted from the supertweeters
of the left and right speakers SL and SR are received by any of the six receiving elements
provided in the form of an array in the headrest portion St3. According to the heel, it is possible
to detect the offset of the head of the listener relative to the headrest portion St3.
[0182]
Furthermore, with regard to the ultrasonic waves transmitted from the supertweeters of the left
and right speakers, by measuring the time from the transmission to the reception by the
receiving element, according to the time and the speed of the ultrasonic waves. The distance
from the headrest St3 to the head of the listener can be detected.
The position of the listener's head relative to the headrest St3 can be detected more accurately
based on the offset and distance of the listener's head relative to the headrest St3.
[0183]
Then, as described above with reference to FIG. 13, the detection unit 80A determines the exact
position of the listener's head based on the detection output from each of the receiving elements
provided in an array on the headrest portion St3. To detect.
That is, as described above, the detection unit 80A receives the ultrasonic wave transmitted from
the supertweeter of each of the left and right speakers by which receiving element, and further
the ultrasonic wave transmitted from the supertweeter of each of the left and right speakers The
position of the listener's head is detected in consideration of the time from transmission to
reception.
[0184]
Then, the CPU 40 corresponds to the current position of the head of the listener relative to the
headrest portion St3 from the detection unit 80A, as in the case of the CPU 40 of the sound
processing apparatus 1 according to the first embodiment described above. The coefficient data
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is read from the recording medium 30, and the read coefficient data is supplied to the target
filters 21, 22, 23, 24 of the transaural system filter unit 20.
[0185]
Thus, in the transaural system unit 20, the correction process is performed on the sound signal
after the sound image localization process according to the position of the head of the listener
relative to the headrest unit St3 and the corrected sound signal is obtained. Is supplied to the left
and right speakers SL and SR, and the sound image of the sound emitted from the left and right
speakers SL and SR is placed at the virtual speaker position even if the position of the listener's
head changes with respect to the headrest St3. It can be localized.
[0186]
That is, even if the position of the head of the listener moves relative to the headrest St3, the
actual position of the head of the listener is measured, and the effect of the transfer function in
the reproduced sound field is determined according to the position. Correction processing can be
performed in the transaural system filter unit 20 so as to remove the
Therefore, the sound images of the sounds emitted from the left and right speakers SL and SR of
the headrest portion St3 can be localized at the virtual speaker position regardless of the position
of the head of the listener.
[0187]
Furthermore, the coefficient data stored in the storage medium 30 is the headrest portion St3 in
which the sound processing device 6 of the fourth embodiment is configured, as in the case of
the third embodiment described above. Therefore, even if the headrest portion St3 is mounted on
any chair (seat) to which the headrest portion St3 can be attached and detached, the left and
right speakers SL and SR provided on the headrest portion St3 are used. The sound image of the
sound emitted from can be localized at a predetermined position with respect to the listener.
[0188]
Also in the case of the sound processing apparatus 6 according to the fourth embodiment, the
data prepared in advance in the storage medium 30 is not limited to the coefficient data, but in
the case of the third embodiment. Similarly, it is possible to use appropriate ones according to
the configuration of each filter of the transaural system filter unit, such as function data and
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parameter data.
[0189]
Also in the fourth embodiment, as in the case of the third embodiment described above, a
simplified transaural system filter unit 50 is used in place of the transaural system filter unit 20.
The sound processing apparatus 5 can be configured with a good configuration simplified.
In this case, the data to be stored in advance in the storage unit 30 can be approximately half
that of the sound processing device 4 of the fourth embodiment shown in FIG.
[0190]
Also, in place of the two-channel sound image localization processing filter 10, multi-channel
sound image localization processing filters such as the five-channel sound image localization
processing unit 50 shown in FIG. 7 can be used.
[0191]
Also in the case of the sound processing apparatus 6 shown in FIG. 12 of the fourth embodiment,
the left and right speakers SL, SR and the recording medium 30 are provided in the headrest
portion St3, and the other portions are the backrest It may be provided between the unit St2, the
sound reproducing device side, or between the speakers SL and SR and the sound reproducing
device.
[0192]
In this case, an inexpensive headrest portion St3 provided with a speaker can be configured, and
various headrest portions different in shape, material, speaker installation position, etc. are
provided, and the user can You can purchase and use something that suits your taste.
[0193]
Also, in the case of the sound processing apparatus 4, 5, 6 of the third and fourth embodiments
described above, ultrasonic waves are used to detect the position of the head of the listener.
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48
Ultrasonic waves can not be heard as sounds in the human ear, so the listener is not aware that
he is performing head detection processing.
[0194]
Also, in the case of a normal music component, there is no problem with an ultrasonic
component that is involved in the detection system (measurement accuracy), so that interference
with the reproduced voice (music signal) for listening purposes becomes a problem. There is no.
That is, it is possible to measure and detect the position of the listener with respect to the
speaker while the music is being reproduced without degrading the reproduced sound and
without the listener being aware of it.
[0195]
In the sound processing apparatus 6 according to the fourth embodiment described above, the
six ultrasonic wave receiving elements are provided at or near the headrest portion St3. However,
the present invention is not limited to this. Of course, more ultrasound receiving elements may
be used, or a plurality of receiving elements may be provided in a plurality of rows.
In addition, the distance between the receiving elements, the direction of the sound emission
surface of the left and right speakers SL, SR, and the like can be appropriately adjusted.
[0196]
The position where the ultrasonic wave receiving element is provided may be provided at any
position where reception of reflection from the head of the listener can be received, in addition to
the headrest portion St3 and its vicinity.
[0197]
[Fifth Embodiment] In the third and fourth embodiments described above, ultrasonic waves are
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49
transmitted to the position of the head of the listener relative to the headrest portion provided
with the speaker, and the reflected wave thereof Was detected by receiving.
However, position detection of the listener's head is not limited to using ultrasound.
[0198]
For example, video phones capable of transmitting and receiving not only voice but also images
have come to be used at home.
Therefore, for example, as shown in FIG. 14, a so-called home theater is provided by a television
set (TV set) 200 and a chair equipped with a sound processing device having a headrest portion
St3 provided with left and right speakers SR, SL. In the case of constructing a system, a CCD
camera 210 usually used for a videophone can be used to detect the position of the head of the
listener relative to the headrest St3.
[0199]
Also, in many cases, the user listens to sounds such as music in the car (in the car).
Therefore, as shown in FIG. 15, it is conceivable to configure the acoustic processing device by
providing a headrest portion in which speakers (SL1, SR1 or SL2, SR2) of left and right two
channels are mounted on a seat in a car.
In such a case, by mounting, for example, the CCD camera 310 for a videophone in a car, it is
possible to use the CCD camera 310 for the videophone for detecting the position of the head of
the listener relative to the headrest portion. .
[0200]
[0200] Even in the present situation, in some types of automobiles, a CCD camera is provided
outside the automobile to eliminate blind spots, and an image captured through this CCD camera
is displayed on a display in the car. It is also possible to provide a camera that can be viewed as it
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50
is, and it is also possible to mount a CCD camera for in-vehicle imaging on a vehicle.
[0201]
Therefore, the sound processing device 7 of the fifth embodiment is a CCD camera (CCD device)
provided in the home or in a car for the position of the head of the listener relative to the
headrest portion provided with the speaker. By using the system to determine in real time how
far the listener's head is sitting with respect to the speaker and using a transfer function suitable
for that position, the virtual speaker localization effect can be achieved with a more free attitude
It is something that can be enjoyed.
[0202]
Incidentally, also in the sound processing apparatus 7 of the fifth embodiment, as in the case of
the sound processing apparatus 1 of the first embodiment described above, it is possible to
process the audio signals of the left and right channels. It is possible to localize the sound image
of the sound emitted from the left and right two-channel speakers provided in the headrest
portion St3 in the forward direction of the listener.
That is, the sound processing device 7 can localize the sound image as the sound emitted from
the left and right two-channel speakers provided in the headrest portion St3 is emitted from the
virtual speakers VSL and VSR.
[0203]
FIG. 16 is a block diagram for explaining the sound processing device 7 of the fifth embodiment.
The sound processing device 7 shown in FIG. 16 is provided in the interior of a home or in a car
as described with reference to FIGS. 14 and 15.
The sound processing apparatus 5 shown in FIG. 16 analyzes the image captured by the CCD
camera 210 and the CCD camera 210, and detects the position of the head of the listener relative
to the headrest St3. Except for the part 90, it is configured in the same manner as the sound
processing apparatus 1 according to the first embodiment shown in FIG.
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[0204]
For this reason, in the sound processing apparatus 7 of the fifth embodiment shown in FIG. 16,
the parts configured in the same manner as the sound processing apparatus 1 of the first
embodiment shown in FIG. The same reference numerals are given and the explanation of the
parts is omitted.
[0205]
Then, in the sound processing apparatus 7 of the fifth embodiment, the CCD camera 210 is set so
as to be directed to the listener, and can always capture an image in the listener direction. There
is.
Then, for example, under the control of the CPU 40, the CCD camera 210 picks up an image in
the direction of the listener at all times or every predetermined timing while the sound
processing device 7 is operating, and analyzes the picked up image. Supply to the unit 90.
[0206]
The image analysis unit 90 analyzes the image data from the CCD camera 210, detects the
position of the listener's head relative to the headrest St3, and notifies the CPU 40 of this.
Specifically, the position of the speakers SL and SR of the headrest portion St3 can be confirmed
in image processing by marking a predetermined position such as a headrest portion of a chair
or a seat where a listener sits down. .
[0207]
[0207] And, since the listener always moves a little while sitting in the chair, it can be used to
extract the edge portion of the listener by taking the time-axis difference of the still image .
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The positional relationship between the listener's head and the speakers SL and SR of the
headrest portion St3 can be known from the listener's edge portion and the position of the
speaker.
[0208]
The CPU 40 reads out the coefficient data stored in the recording medium 30 based on the
detection result (the position of the head of the listener) from the image analysis unit 90, and the
coefficient data is read by the transaural system filter unit 20. Supply the filter.
[0209]
Thus, in the transaural system filter unit 20, the sound signal subjected to sound image
localization processing is subjected to correction according to the position of the head of the
listener, and the head of the listener for the headrest St3. Even when the position of (v) changes,
the sound image of the sound emitted from the left and right speakers SL and SR of the headrest
portion St3 can be localized so as to be emitted from the virtual speakers VSL and VSR.
[0210]
When an image picked up by the CCD camera 210 is analyzed, the head moves in the vertical
direction, which is a direction perpendicular to the head contact surface of the headrest St3, and
the headrest St3. Lateral movement of the latter is easier to detect when the head moves in the
lateral direction parallel to the head contact surface.
[0211]
Since the speaker is originally provided at the headrest St3 and located near the listener's ear,
even if the listener's head moves by the same amount, the head contact surface of the headrest
St3 is against the head contact surface. Between the head moving in the vertical direction, which
is perpendicular to the vertical direction, and the head moving in the horizontal direction, which
is a direction parallel to the head contact surface of the headrest St3, The change in transfer
function from the speaker to the listener's ear is worse in the case.
[0212]
Therefore, in the sound processing apparatus 7 of the fifth embodiment, the position (offset) of
the listener's head in the lateral direction is sensed by analyzing the image picked up by the CDD
camera 210. Accordingly, by using appropriate filter coefficients for each filter of the transaural
system fill unit 20, the sound image of the sound emitted from the left and right speakers SL and
SR of the headrest portion St3 is accurately corrected. It is made to localize to a predetermined
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position.
[0213]
Also in the sound processing device 7 of the fifth embodiment, a simplified transaural method is
used as in the case of the sound processing device 5 shown in FIG. 11 in place of the transaural
system filter unit 20. The system unit 50 can also be used.
Also, instead of the two-channel sound image localization processing filter unit 10, multi-channel,
for example, five-channel sound image localization processing filters 60 may be used.
[0214]
Therefore, also in the case of the sound processing apparatus 7 of the fifth embodiment, as in the
case of the sound processing apparatus of the third and fourth embodiments described above,
the listener for the headrest portion St3 The position of the head is measured constantly or at
any time, and correction processing (transaural processing) is performed according to the
transfer function according to the measured position, thereby measuring the position of the head
of the listener as in the prior art. To avoid effects such as localization of the sound image in front
of the sound image and localization of the sound image regardless of the position of the virtual
speaker localization effect due to the incorrect combination of the listening position and the
listening position, regardless of the position of the listeners head it can.
[0215]
In the first, second, third, and fourth embodiments described above, the sound emitting surface
of the speaker provided in the headrest portion is parallel to the surface of the headrest portion
in contact with the head. However, it is also possible to make an appropriate correction such as
tilting the sound emitting surface of the speaker provided in the headrest portion toward the
listener or the like.
[0216]
In the embodiment described above, the headrest portion is provided with two speakers, the left
speaker SL and the right speaker SR. However, the number of speakers must be two. There may
be one, or three or more.
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Further, as described above, it is needless to say that a so-called HiFi-oriented speaker device
provided with a tweeter or the like can be used.
[0217]
Also in the case of the sound processing apparatus 7 shown in FIG. 16 of the fifth embodiment,
the left and right speakers SL, SR and the recording medium 30 are provided in the headrest
portion St3, and the other portions are the backrest It may be provided between the unit St2, the
sound reproducing device side, or between the speakers SL and SR and the sound reproducing
device.
[0218]
In this case, an inexpensive headrest portion St3 provided with a speaker can be configured, and
various headrest portions different in shape, material, speaker installation position, etc. are
provided, and the user can You can purchase and use something that suits your taste.
[0219]
When purchasing a headrest unit incorporating a speaker and a recording medium, the transfer
function to the user's ear using the headrest unit is measured, and the transfer function specific
to the user using the headrest is taken. Corresponding coefficient data, function data and
parameter data may be stored in a recording medium.
[0220]
In this case, since the correction processing more suitable for the individual user using the
headrest portion can be performed on the audio signal, a sound processing apparatus suitable for
each user is configured. can do.
[0221]
Also, in the above embodiment, it has been described that the transfer function in the
reproduction sound field is different depending on the shape, material, speaker installation
position, performance and characteristics of the speaker, and the like of the headrest portion
where the speaker can be provided. .
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In this case, the performance of the speaker includes the directivity characteristics of the speaker
and the like, and the characteristics of the speaker include frequency characteristics and the like.
That is, the transfer function changes depending on the directivity characteristic and the
frequency characteristic of the speaker, but these can also be dealt with.
[0222]
Also, various methods can be used for storing coefficient data, function data, parameter data and
the like stored in a semiconductor memory used as a recording medium and various disks, and
various data formats can be used.
Also, as described above, the data stored in the recording medium may be a transfer function
from the playback speaker to the listener's volume ear, or the transaural operation is actually
performed, and the actual voice is Data in a form immediately before folding may be recorded on
a recording medium.
[0223]
Not only one transfer function but also a plurality of transfer function information can be stored
in the recording medium.
That is, transfer function information corresponding to the size, position, shape, presence or
absence of glasses, etc. of the listener's own face is recorded on the recording medium, and such
information is selected by the listener itself, or The effect of sound image localization of the
virtual speaker can be further enhanced by the automatic detection of the sensor and the
correction processing.
[0224]
Of course, one or more transfer functions may be recorded on the recording medium.
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In this case, there is an advantage that the position where the sound image localization effect is
enhanced can be selected and set at the time of headrest creation according to the shape of the
headrest portion where the speaker is provided and the installation position of the speaker
accompanying this. Sound image localization effect can be provided.
[0225]
In each of the above-described embodiments, a so-called power amplifier is omitted in the block
diagram for explaining the sound processing apparatus.
This is to simplify the explanation.
The power amplifier can be provided at an appropriate position such as the headrest portion
side, the chair side, or the reproduction device side.
[0226]
In addition to the coefficient data supplied to the correction processing unit, for example, music
data and other data may be stored in the storage medium and used.
[0227]
Also, coefficient data and function data stored in a recording medium provided in the headrest
portion can be updated relatively easily, for example, via a personal computer.
In this case, the headrest portion can be easily carried, and processing such as version upgrade
performed by connecting to the personal computer can be easily performed.
[0228]
Also, a new product called "functional headrest" can be provided, and a new business market can
be created.
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[0229]
As described above, according to the sound processing apparatus of the present invention, when
the speaker is provided, for example, in the headrest portion, the headrest portion including the
detachable head can be included in a plurality of different chairs. It is an acoustic processing
device, and it is possible to realize an acoustic processing device that does not cause
inconveniences such as lack of the effect of virtual speaker localization, even when the headrest
portion is attached to and used in any chair. it can.
[0230]
Further, when the listener changes the headrest portion provided with the speaker, the
information such as the shape and size of the headrest is manually operated to the correction
processing portion for correcting the sound signal in which the sound image is localized. It is
possible to incorporate data corresponding to the transfer function specific to the headrest
portion into the sound processing device only by the operation of connecting the headrest
portion to the chair portion without the need for troublesome work such as setting in the above.
[0231]
It is possible to inexpensively manufacture various headrests different in design, size, installation
position of the speaker, etc. in which the speaker is provided, and the user can fit his / her taste
and, for himself, the sound image localization effect It is possible to have a range of choices for
the headrest portion, such as being able to select the most effective headrest portion.
[0232]
Also, the position of the listener's head relative to the speaker is detected, and depending on the
actual listening position, the correction processing to be performed on the audio signal is suitably
performed to remove the influence of the transfer function in the reproduced sound field. It can
be done to
The listener can listen to the sound that is relaxed, subjected to sound localization processing,
and emitted in a comfortable state without restriction of the position of his head.
[0233]
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Brief description of the drawings
[0234]
1 is a block diagram for explaining a first embodiment of a sound processing apparatus
according to the present invention.
[0235]
2 is a diagram for explaining the appearance of a chair equipped with a sound processing
apparatus according to the first embodiment.
[0236]
3 is a diagram for explaining the principle of sound image localization processing performed in
the sound processing apparatus according to the first embodiment shown in FIG.
[0237]
<Drawing 4> It is the headrest section where the speaker is provided, is the figure in order to
explain the example of the headrest section which differs in form.
[0238]
5 is a diagram for explaining another configuration example of the sound processing apparatus
shown in FIG.
[0239]
6 is a view for explaining a modification of the sound processing apparatus shown in FIG.
[0240]
7 is a block diagram for explaining a second embodiment of the sound processing apparatus
according to the present invention.
[0241]
8 is a diagram for explaining the principle of the sound image localization process performed in
the sound processing apparatus according to the second embodiment shown in FIG.
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[0242]
<Figure 9> It is the block diagram in order to explain the form of 3rd execution of the sound
processing device due to this invention.
[0243]
10 is a diagram for explaining the process of detecting the position of the head of the listener
performed in the sound processing apparatus according to the third embodiment shown in FIG.
[0244]
11 is a block diagram for explaining a modification of the sound processing apparatus according
to the third embodiment shown in FIG.
[0245]
12 is a block diagram for explaining a fourth embodiment of the sound processing apparatus
according to the present invention.
[0246]
13 is a diagram for explaining the process of detecting the position of the head of the listener
performed in the sound processing apparatus according to the fourth embodiment shown in FIG.
[0247]
14 is a diagram for explaining an example of usage of the sound processing apparatus according
to the fifth embodiment of the present invention.
[0248]
FIG. 15 is a view for explaining another example of usage of the sound processing apparatus
according to the fifth embodiment of the present invention.
[0249]
<Figure 16> It is the block diagram in order to explain the acoustic processing unit of form of 5th
execution by this invention.
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[0250]
Explanation of sign
[0251]
DESCRIPTION OF SYMBOLS 10 ... Sound image localization process filter part, 11-14 ... Filter, 15,
16 ... Addition part, 20 ... Transoral system filter part, 21-24 ... Filter, 25, 26 ... Addition part, SL ...
Left speaker, SR ... Right Speaker, VSL: virtual left speaker, VSR: virtual right speaker, 30:
recording medium, 40: CPU, 50: simplified transaural system filter unit, 51, 52: filter, 60: sound
image localization processing filter unit, 61-70 ... filter 71, 72 ... addition unit, 80 ... head position
detection unit, SS1 to SS6 ... ultrasonic wave receiving element, 90 ... image analysis unit, 210,
310 ... CCD camera
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