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JP2006352732

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DESCRIPTION JP2006352732
PROBLEM TO BE SOLVED: To output a voice that should be input exclusively to the right ear of
the listener from the right ear loudspeaker with a voice that the listener does not get tired of
listening and a voice that should be input exclusively to the left ear of the listener from the left
ear loudspeaker To provide an audio system capable of outputting SOLUTION: A loudspeaker
200LS for the left ear and a loudspeaker 200RS for the right ear, and an audio signal to be
inputted exclusively to the left ear of the listener is inputted to the loudspeaker for the left ear
and inputted exclusively to the right ear of the listener An audio system 100 comprising an audio
device 300 for inputting an audio signal to be processed to a loudspeaker for the right ear,
wherein the left and right ear loudspeakers are for the listener's both ears at a predetermined
listening position. The voice is output with a narrow directivity characteristic in which the voice
reaches only the right ear and the left ear respectively. [Selected figure] Figure 4
オーディオシステム
[0001]
According to the present invention, an audio signal of audio to be input exclusively to the left ear
of the listener is input to the loudspeaker for the left ear, and an audio signal of audio to be input
exclusively to the right ear of the listener is input to the loudspeaker for right ear It relates to the
audio system to be input.
[0002]
In recent years, an audio system for inputting binaural signals and the like to left and right
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loudspeakers disposed on the front right side and front left side of the listener has been generally
used (for example, Patent Document 1).
With this binaural signal, a sound to be delivered to the left ear of the listener is output from the
speaker for the left ear, and a voice to be delivered to the right ear of the listener is output from
the speaker for the right ear. To achieve
[0003]
For this reason, when a sound to be caused to reach the left ear is inputted to the right ear or a
sound to be caused to reach the right ear is inputted to the left ear, a certain predetermined
sense of stereotaxy is faded. The audio to be input to the left ear reaching the right ear and the
audio to be input to the right ear reaching the left ear are referred to as crosstalk. However, if
sound is emitted from the loudspeaker instead of the headphones, crosstalk will occur as shown
in FIG.
[0004]
In order to prevent such a disadvantage, in the conventional audio system, a signal for canceling
the crosstalk component is added to the audio signal input to the left and right speakers. That is,
the signal for canceling the crosstalk from the right speaker to the left ear of the listener is added
to the audio signal input to the left speaker. At the same time, a signal for canceling crosstalk
from the left speaker to the right ear of the listener is added to the audio signal input to the right
speaker.
[0005]
Such a cancellation signal cancels the crosstalk component before it is input to the listener's ear,
thereby preventing the crosstalk component from being input to the listener's ear. As a result,
even in the configuration in which sound is output from the loudspeaker, crosstalk can be
prevented and the listener can be made to recognize that the sound source is at the
predetermined position P. Patent document 1: JP-A-2000-059880
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2
[0006]
However, in the conventional audio system, processing for adding a signal for canceling crosstalk
to the audio signal of each of the left and right channels in this way is performed, so if listening
to the voice subjected to this processing for a long time, the listener becomes tired of listening
Had a problem.
[0007]
Therefore, in order to solve the above problems, the present invention outputs a voice that
should be input exclusively to the right ear of the listener from the right ear loudspeaker with a
voice that the listener does not get tired of listening to, and from the left ear loudspeaker An
object of the present invention is to provide an audio system capable of outputting an audio to be
input exclusively to the left ear of a listener.
[0008]
In order to solve the above-mentioned subject, the following means are adopted in the present
invention.
[0009]
(1) The present invention provides a loudspeaker for the left ear, a loudspeaker for the right ear,
and an audio signal to be input exclusively to the left ear of the listener into the loudspeaker for
the left ear and also exclusively to the listener's right ear. An audio system comprising an audio
device for inputting an audio signal to be input to the right ear loudspeaker, wherein the left ear
and right ear loudspeakers are each of the listener's both ears at a predetermined listening
position. The voice is output with a narrow directivity characteristic in which the voice reaches
only the left ear and the right ear, respectively.
[0010]
In the above configuration, the audio signal of the sound to be input exclusively to the left ear of
the listener is input to the left ear loudspeaker.
This causes the left-ear loudspeaker to emit sound that should be input exclusively to the left ear
of the listener.
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At the same time, an audio signal of a sound to be input exclusively to the right ear of the listener
is input to the right ear loudspeaker.
As a result, the right-ear loudspeaker emits the sound that should be input exclusively to the
right ear of the listener.
[0011]
Here, the left and right ear loudspeakers output sound in a narrow directional pattern in which
the sound reaches only the right and left ears of the listener's both ears at a predetermined
listening position.
For this reason, it becomes possible from the loudspeaker for the left ear to output an audio
beam which reaches only the left ear and does not reach the right ear at the listening position. In
addition, from the right ear loudspeaker, it is possible to output an audio beam that reaches only
the right ear and does not reach the left ear at the listening position.
[0012]
This makes it possible to effectively prevent the sound from the speaker for the left ear from
reaching the right ear and the sound from the speaker for the right ear from reaching the left
ear. The sound that is output from the left ear speaker and reaches the right ear and the sound
that is output from the right ear speaker and reaches the left ear is referred to as crosstalk. When
this crosstalk occurs, the listener recognizes the direction of the sound source from the volume
and input timing of the sound reaching the right ear and the sound reaching the left ear. This
crosstalk can be prevented, and the listener can be given a certain sense of stereotacticity by
inputting into the left ear the audio that should be input exclusively to the left ear and inputting
the audio that should only be input into the right ear into the right ear It becomes.
[0013]
Here, crosstalk is prevented only by the characteristics of the loudspeaker for the left ear and the
loudspeaker for the right ear without performing audio signal processing for canceling the
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crosstalk on the audio signal by the audio apparatus. For this reason, it is possible to output a
sound without tiredness in comparison with the sound of the audio signal subjected to the sound
signal processing for canceling the crosstalk.
[0014]
(2) According to the present invention, the left ear and right ear loudspeakers are array speakers
comprising a plurality of speaker units arranged in a line, and the audio device forms an audio
beam in the left direction. And processing the audio signal of the left ear and processing the
audio signal of the right ear so as to form an audio beam in the right direction.
[0015]
Thus, the front left and right ear loudspeakers are array speakers.
Then, the audio signal of the left ear is processed by the signal processing unit so as to form an
audio beam in the left direction, and the audio signal is input to the array speaker for the left ear.
Also, the audio signal of the right ear is processed so as to form an audio beam in the right
direction, and input to the array speaker for the right ear. For this reason, it is possible to output
an audio beam with such a narrow directivity that each of the listener's ears reaches only the
right and left ears at a predetermined listening position.
[0016]
Even in the case of an array speaker provided with speaker units arranged in a matrix or in a
staggered grid, it is included in the array speaker here because it has the configuration having
speaker units arranged in a line . Be
[0017]
According to the present invention, crosstalk can be prevented only by the characteristics of the
loudspeaker for the left ear and the loudspeaker for the right ear without applying audio signal
processing to the audio device to cancel crosstalk. .
As a result, it is possible to provide an audio system that outputs an audio without fatigue
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compared to the audio of an audio signal subjected to audio signal processing for canceling
crosstalk.
[0018]
An audio system 100 according to an embodiment of the present invention will be described with
reference to FIGS. 1 to 4. FIG. 1 is a diagram for explaining the arrangement of the speakers 200
of the audio system 100 according to the present embodiment and the sound output from the
speakers 200LS and 200RS. The audio system 100 is a 5.1 channel system. That is, the audio
system 100 outputs audio signals of channels l, r, c, rs, and ls. Therefore, the audio system 100
includes the speaker 200L (loudspeaker for left ear) for inputting the sound of the channels ls
and rs in addition to the speakers 200L and 200R for inputting the sound of the channels l, r and
c. It is equipped with 200 RS (right ear loudspeaker). The speakers 200L and 200LS are disposed
on the front left side (the back left side of the drawing) of the listener at the listening position lp,
and the speakers 200R and 200RS are disposed on the front right side (the drawing rear right
side) of the listener.
[0019]
In the 5.1 channel system, in addition to the audio signals of the channels l, r, c, rs, and ls, there
are also channels to be output to the subwoofer, but in the present embodiment, the description
regarding the channels and the subwoofer is omitted. Moreover, when not distinguishing these
speakers 200L, 200R, 200LS, and 200RS, it describes as the speaker 200. FIG.
[0020]
The audio signals of the channels ls and rs are binaural audio signals, and an audio signal to be
exclusively delivered to the left ear of the listener is input to the speaker 200LS, and an audio
signal to be exclusively delivered to the right ear is input to the speaker 200RS . The audio signal
has its frequency characteristic adjusted to be localized at the position P (details will be described
later). This makes it possible for the listener to recognize that the sound source of the sound of
the channel ls, rs is at the position P.
[0021]
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In such a configuration, when the voice (cross talk) from the speaker 200 LS is input to the right
ear of the listener or the voice (cross talk) from the speaker 200 RS is input to the right ear of the
listener, a sense of localization is given. Will fade.
[0022]
In the present embodiment, the speakers 200LS and 200RS are configured by array speakers, the
left surround signal is directed to the left ear of the listener to be an audio beam, and the right
surround signal is directed to the right ear to the listener and the audio beam is formed. There is.
The figure symbolically shows the function of this array speaker. Then, at the listening position
lp, the speaker 200LS outputs an audio beam with a narrow directivity such that the audio
reaches only the right ear among the listener's both ears. In addition, the speaker 200 </ b> RS
outputs an audio beam with a narrow directivity such that audio reaches only the right ear
among the listener's both ears.
[0023]
This prevents cross talk as described above. Here, the speakers 200L and 200R are normal
loudspeakers and output sound so that the sound reaches the listening position lp in a directivity
range covering the entire listening position lp of the listener, but these are also array speakers It
may be configured.
[0024]
Thus, in the audio system 100, crosstalk cancellation is prevented by the characteristics of the
speakers 200LS and 200RS, and crosstalk is not prevented by audio signal processing. For this
reason, the sounds output from the speakers 200LS and 200RS do not become tired listening
sounds such as sounds subjected to audio signal processing for crosstalk cancellation.
[0025]
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The configuration of the speakers 200LS and 200RS will be described below with reference to
FIGS. 2 and 3. FIG. 2A is a front view of the speakers 200LS and 200RS, and FIG. 2B is a view
showing the principle of the speakers 200LS and 200RS of FIG. FIG. 3 is a diagram for explaining
the principle of focusing of the sound beam from the speakers 200LS and 200RS shown in FIG.
[0026]
Referring to FIG. 2, as shown in (A), the speakers 200LS and 200RS are array speakers in which a
plurality of speaker units su are arranged in a line. As shown in (B), the output sound from each
speaker unit su propagates radially (circularly). For this reason, when the same audio signal is
output from each speaker unit su, only the components propagating in the front direction of each
speaker unit su match the phases of the sound emitted from each speaker unit su and strengthen
each other . Then, the component propagating in the other diagonal direction is canceled out by
interfering with the component from the adjacent speaker unit su.
[0027]
As a result, the synthesized component of each speaker unit su is mainly the voice beam
propagating in the front direction of each speaker unit su. This audio beam can be focused by
adjusting the delay time of the audio signal input to each speaker unit su as shown in FIG. This
focusing is performed by adding a delay time (time indicated by an arrow in the figure) to the
audio signal input to each speaker unit su so that the sound output from each speaker unit su
simultaneously reaches the focus. .
[0028]
As described above, in the speakers 200LS and 200RS, the directivity direction of the sound
beam can be controlled in the arrangement direction of the speaker units su. Therefore, the
speakers 200LS and 200RS are arranged such that the arrangement direction coincides with the
horizontal direction in FIG.
[0029]
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8
FIG. 4 is a block diagram schematically showing the configuration of the audio system 100. As
shown in FIG. The audio system 100 includes the above-described speakers 200L, 200R, 200LS,
200RS, and an audio device 300 connecting these speakers 200. The audio device 300 includes
an audio interface 1, a signal processing unit 2, a DA converter 3, an amplification unit 4 and a
control unit 5.
[0030]
The audio interface 1 is an interface circuit for inputting a digital audio signal from an audio
reproduction apparatus (not shown) connected to the input terminal 6a via the input terminal 6a.
The signal processing unit 2 separates the audio signal input from the audio interface 1 into the
channels l, r, c, ls, and rs, and performs filter processing (frequency characteristic control) on the
separated audio signal to the speaker 200. Perform signal processing such as adjustment of
output level and delay time.
[0031]
The signal processing unit 2 includes, for example, a DSP (Digital Signal Processor) or the like,
and outputs an audio signal subjected to signal processing to the corresponding DA converter 3
for the channels l and r. At the same time, the signal processing unit 2 separates the audio signal
of the center channel c into two and inputs them to the adding units 71 and 72, respectively.
[0032]
The addition unit 71 is disposed in the signal path of the signal processing unit 2-DA converter 3
(31), and the addition unit 72 is disposed in the signal path of the signal processing unit 2-DA
converter 3 (32). The audio signals of channel c are added to the audio signals of channels l and r
by these adders 71 and 72, respectively. The added audio signal is input to the DA converters 31
and 32, respectively.
[0033]
Also, the signal processing unit 2 inputs the audio signals of the channels ls and rs to the rear
localization adding unit 8 described later.
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[0034]
The DA converter 3 converts the input digital audio signal into an analog signal.
The DA converter 3 is provided for each speaker 200, and the DA converter 31 corresponds to
the speaker 200L. The DA converter 32 corresponds to the speaker 200R. The DA converter 33
corresponds to the speaker 200LS. The DA converter 34 corresponds to the speaker RS.
[0035]
The audio signals of channels l and r to which the audio signals of channel c have been added via
the adding units 71 and 72 are input to the DA converters 31 and 32, respectively. Audio signals
of channels ls and rs are input to the DA converters 33 and 34.
[0036]
The amplification unit 4 (41 to 44) is provided for each speaker 200, amplifies the signal level of
the audio signal input from the DA converter 3, and inputs the amplified signal level to the
speaker 200 connected to the output terminal 6 b. As a result, the voices of the channels l, r, c, ls
and rs are respectively emitted from the speakers 200L, 200R, 200LS and 200RS.
[0037]
The control unit 5 includes a storage unit such as a memory, an operation unit that receives a
user's operation, and a CPU (Central Processing Unit), and executes the programs stored in the
memory to execute the operation of each unit of the audio device 300. Control.
[0038]
In addition to the above configuration, the audio apparatus 300 includes a rear localization
adding unit 8, a signal correction unit 9, and a delay adjustment unit 10 in order to perform
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audio signal processing on audio signals of channels ls and rs.
The rear localization adding unit 8 is realized by, for example, a FIR (Finite Impulse Response)
filter or the like, and corrects the frequency characteristic of the audio signal in order to localize
the sound of the channels l and r to a predetermined position P.
[0039]
When the sound reaches from the sound source to the human ear, the sound is attenuated
according to the distance and direction from the sound source to the ear, and the frequency
characteristic changes. In addition to this, the frequency characteristics also change due to
reflection by the head, surrounding, reflection by the pinnacle, and the like. Based on the change
of the frequency characteristic, the listener empirically recognizes the direction and distance of
the sound source.
[0040]
Therefore, by correcting the frequency characteristics, the rear localization adding unit 8 causes
the listener to recognize that there is a sound source (at the position P) in a predetermined
direction and distance. The rear localization adding unit 8 includes an LS rear localization adding
unit 8A that corrects the frequency characteristic of the audio signal of the channel 1 and an RS
rear localization adding unit 8B that corrects the frequency characteristic of the audio signal of
the channel r.
[0041]
The audio signal of the channel ls is input from the signal processing unit 2 to the LS rear
localization adding unit 8A. The LS rear localization adding unit 8A separates the input audio
signal into an audio signal (audio signal x1) for input to the speaker 200LS and an audio signal
(audio signal x2) for input to the speaker 200RS.
[0042]
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In the LS rear localization adding unit 8A, as shown in FIG. 1, a filter coefficient corresponding to
a head-related transfer function (HTRF) h1 from the position P to the left ear of the listener is set.
Also, a filter coefficient corresponding to a head-related transfer function h2 from the position P
to the right ear of the listener is set. The head related transfer function is a transfer function of
sound from the sound source to the ear of the listener.
[0043]
The LS rear localization adding unit 8A performs a convolution operation on the audio signal x1
with a filter coefficient corresponding to the head related transfer function h1. At the same time,
the audio signal x2 is convoluted with filter coefficients corresponding to the head-related
transfer function h2. By this, it is possible to correct the frequency characteristic of the audio
signal of the channel ls so that the sound is localized at the position P.
[0044]
In the RS rear localization adding unit 8B, filter coefficients corresponding to the head related
transfer functions h1 and h2 are set. The audio signal of the channel rs is input from the signal
processing unit 2 to the RS rear localization adding unit 8B. The RS rear localization adding unit
8B also separates the input audio signal into an audio signal (audio signal x3) for inputting to the
speaker 200RS and an audio signal (audio signal x4) for inputting to the speaker 200LS. .
[0045]
Then, the RS rear localization adding unit 8B also performs the convolution operation on the
audio signal x3 with the filter coefficient corresponding to the head transfer function h2, as in
the LS rear localization adding unit 8A. At the same time, the audio signal x4 is convoluted with
filter coefficients corresponding to the head-related transfer function h1. This makes it possible
to correct the frequency characteristics of the audio signal of the channel rs so that the sound is
localized at the position P.
[0046]
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After the frequency characteristics are corrected as described above, the audio signal x1 is input
from the LS rear localization adding unit 8A to the corresponding signal correction unit 9 (9A).
Further, the audio signal x1 is input from the RS rear localization adding unit 8B to the
corresponding signal correction unit 9 (9B). An addition unit 11A is disposed in the signal path
from the LS rear localization addition unit 8A to the signal correction unit 9 (9A). Further, an
addition unit 11B is disposed in a signal path from the RS rear localization adding unit 8B to the
signal correction unit 9 (9B).
[0047]
The audio signal x2 from the LS rear localization adding unit 8A is input to the addition unit 11B.
After the audio signal x2 is added to the audio signal x3 by the addition unit 11B, the addition
signal (audio signal x11) is input to the signal correction unit 9 (9B). The audio signal x4 from
the RS rear localization adding unit 8B is input to the addition unit 11A. After the audio signal x4
is added to the audio signal x1 by the addition unit 11A, the addition signal (audio signal x12) is
input to the signal correction unit 9 (9A).
[0048]
The signal correction unit 9 is realized by, for example, a FIR (Finite Impulse Response) filter or
the like. The signal correction unit 9 corrects the frequency characteristic of the input audio
signal in the same manner as the rear localization addition unit 8. However, the purpose of the
correction of the frequency characteristic in the signal correction unit 9 is to flatten the
frequency characteristic of the sound reaching the ear of the listener from the speakers 200LS
and 200RS.
[0049]
When the sound from the speakers 200LS and 200RS reaches the ear of the listener, it
attenuates according to the distance and the frequency characteristic changes. The frequency
characteristics also change due to reflection by the head, reflection and so on, and reflection by
the pinna. As described above, the human recognizes the direction of the sound source and the
distance from the sound source from the change of the frequency characteristic. For this reason,
if the audio signal is not corrected at all, the listener can not recognize that the sound is localized
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at the position P due to a change in frequency characteristics from the speakers 200LS and
200RS to the ear of the listener.
[0050]
Therefore, the signal correction unit 9 corrects the frequency characteristic of the audio signal
(flatly) so that the sound reaches the ear of the listener in a state before the change of the
frequency characteristic.
[0051]
The signal correction unit 9 includes an LSch signal correction unit 9A and an RSch signal
correction unit 9B.
In the LSch signal correction unit 9A, a filter coefficient corresponding to a head-related transfer
function h3 from the speaker 200LS to the left ear of the listener is set.
[0052]
Here, the distance from each speaker unit su of the speaker 200LS to the left ear of the listener is
different. Therefore, the filter coefficients of the head-related transfer function h3 from each of
the speaker units su to the left ear of the listener are set in the LSch signal correction unit 9A.
That is, different filter coefficients are set for the number of speaker units su.
[0053]
As described above, the audio signal x11 is input to the LSch signal correction unit 9A. The LSch
signal correction unit 9A separates the input audio signal x11 by the number of the speaker units
su of the speaker 200LS. Then, the LSch signal correction unit 9A corrects the frequency
characteristics by performing a convolution operation on each of the separated audio signals x11
with the corresponding filter coefficients. The LSch signal correction unit 9A inputs each
corrected audio signal x11 to the corresponding delay adjustment unit 10 (10A).
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[0054]
A filter coefficient corresponding to a head-related transfer function h4 from the speaker 200RS
to the right ear of the listener is set in the RSch signal correction unit 9B. Here, the distance from
each speaker unit su of the speaker 200RS to the right ear of the listener is different. Therefore,
the filter coefficients of the head-related transfer function h4 from each of the speaker units su to
the right ear of the listener are set in the RSch signal correction unit 9B. That is, different filter
coefficients are set for the number of speaker units su.
[0055]
The audio signal x12 is input to the RSch signal correction unit 9B as described above. The RSch
signal correction unit 9B separates the input audio signal x12 by the number of the speaker units
su of the speaker 200RS. The RSch signal correction unit 9B corrects the frequency characteristic
of the audio signal x12 by performing convolution operation of the separated audio signals x12
with the corresponding filter coefficients. The RSch signal correction unit 9B inputs each
corrected audio signal x12 to the corresponding delay adjustment unit 10 (10B).
[0056]
As described above, in the LSch signal correction unit 9A and the RSch signal correction unit 9B,
the audio signals x11 and x12 are separated by the number of the speaker units su of the
speakers RS and LS. Then, to each of the separated audio signals x11 and x12, a frequency
characteristic based on the inverse function of the head-related transfer function from the
speaker unit su to which the signal is input to the listener's ear is given. By this, the frequency
characteristics of the audio signals x11 and x12 can be corrected to be sufficiently flat in
consideration of the difference in head-related transfer function from each speaker unit su to the
ear of the listener. Therefore, the listener can recognize that the sound is localized at the position
P without being influenced by the change in the frequency characteristic from the speakers LS
and RS to the ear of the listener.
[0057]
The delay adjustment unit 10 adds delay times to the audio signals x11 and x12. The delay
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adjustment unit 10A applies delay time to the audio signal x11, and the delay adjustment unit
10B applies delay time to the audio signal x12. The audio signal x11 is input to the delay
adjustment unit 10A, and the audio signal x12 is input to the delay adjustment unit 10B.
[0058]
Then, as shown in FIG. 3, the delay adjusting units 10A and 10B add delay times to the audio
signals x11 and x12. Thus, the focus of the sound beam output from the speaker 200LS is
focused on the left ear of the listener, and the focus of the sound beam output from the speaker
200RS is focused on the right ear of the listener.
[0059]
The audio signal x11 given the delay time is input from the delay adjustment unit 10A to the DA
converter 33. At the same time, the audio signal x12 to which the delay time is added is input
from the delay adjustment unit 10B to the DA converter 34. Thereafter, the audio signal x11 is
input to the speaker 200LS via the DA converter 33-the amplifier 43. Also, the audio signal x12
is input to the speaker 200RS via the DA converter 34-the amplifier 44.
[0060]
As a result, although the audio beam of the audio signal x11 is output from the speaker 200LS,
this audio beam does not reach the right ear but reaches only the left ear. Further, although a
voice beam of the audio signal x12 is output from the speaker 200RS, the voice beam does not
reach the left ear but reaches only the right ear. Therefore, crosstalk in which the sound from the
speaker 200LS reaches the right ear or crosstalk in which the sound from the speaker 200RS
reaches the left ear does not occur.
[0061]
As described above, in the present embodiment, the speakers 200LS and 200RS, which are array
speakers, are used. Then, the voice beam is directed to the left ear of the listener in such a
narrow directivity range that the sound from the speaker 200LS does not reach the right ear
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among the listeners ears. Then, the voice beam is directed to the right ear of the listener in such
a narrow directivity range that the sound from the speaker RS does not reach the left of the
listener's ears.
[0062]
In this manner, crosstalk is prevented by utilizing the characteristics of the speakers 200LS and
200RS. That is, in the present embodiment, crosstalk is not prevented by performing audio signal
processing for canceling crosstalk in audio signal processing. Therefore, the listener can hear the
sound of the channels ls and rs without being tired of listening even when listening for a long
time.
[0063]
The following modifications can be employed in the present embodiment.
[0064]
(1) In the present embodiment, only the speakers 200LS and 200RS are configured by array
speakers, but the speakers 200L and 200R may be configured by array speakers.
In addition, it is possible to output sound of l and r channels from the speakers 200L and 200R
configured by array speakers, and not to provide the speakers 200LS and 200RS.
[0065]
(2) Further, in the present embodiment, the arrangement of the speaker units su of the speakers
200LS and 200RS is in the form of a single line, but is not limited thereto. For example, the
speaker units su may be arranged in a matrix or in a staggered arrangement, as long as the
arrangement allows focusing of the sound beam.
[0066]
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(3) Moreover, although it is the structure which provides speaker 200LS and 200RS separately, it
is not limited to this structure. For example, the speakers 200LS and 200RS may be configured
by one array speaker. In this case, an audio beam directed from a part of the speaker unit group
of one array speaker to the right ear of the listener is output, and an audio beam directed to the
left ear of the listener from the other part is output .
[0067]
(4) Although the speakers 200LS and 200RS are array speakers, the present invention is not
limited to this. The speakers 200LS and 200RS may be speakers capable of outputting sound in a
narrow directivity range in which only the left ear and the right ear of the listener's both ears
reach the listening position lp.
[0068]
(5) Also, although the 5.1 channel multi-channel audio system 100 has been described, the
number of channels is not limited to this. Audio signals of at least two channels of audio to be
input exclusively to the left ear and audio to be input exclusively to the right ear may be input to
the corresponding speaker 200.
[0069]
(6) In the present embodiment, the listener must listen to the audio at the predetermined
listening position lp, but may be configured to control the pointing direction of the audio beam
following the movement of the listener.
[0070]
It is a figure for demonstrating arrangement ¦ positioning of the speaker of the audio system
concerning this embodiment, and the audio ¦ voice output from a speaker.
It is a front view of a speaker, and (B) is a figure which shows the principle which the speaker of
(A) outputs an audio ¦ voice beam. It is a figure for demonstrating the principle of focusing of the
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audio ¦ voice beam from the speaker shown in FIG. It is a block diagram showing composition of
an audio system roughly. It is a figure for demonstrating crosstalk.
Explanation of sign
[0071]
100-audio system 200 LS-speaker (speaker for left ear) 200 RS-speaker (speaker for right ear)
300-audio device 11-delay adjustment unit (signal processing unit) P-localization position
10-05-2019
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