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JP2009159312

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DESCRIPTION JP2009159312
To provide a comfortable acoustic environment for a listener without impairing the clarity of
sound at a listening position. An audio reproduction apparatus according to the present invention
reproduces audio via a speaker 17 consisting of speaker units 17a to 17f and a speaker 17
'consisting of speaker units 17'a to f. Then, for each of the speakers, the amplitude detection unit
13, the delay amount detection unit 12, and the control unit 15 detect a speaker unit positioned
closest to the user's listening position among the speaker units that constitute the speaker. .
Then, the speaker selection circuit 10 selects, for each of the speakers, the speaker unit detected
by the detection means as a speaker unit for outputting the sound in the speaker. [Selected
figure] Figure 1
Audio reproducing apparatus, audio reproducing method, audio reproducing system, control
program, and computer readable recording medium
[0001]
The present invention relates to an audio reproduction apparatus, an audio reproduction method,
an audio reproduction system, a control program, and a computer readable recording medium,
which reproduces audio via a speaker including a plurality of speaker units such as a polyhedral
speaker.
[0002]
At present, television is often used mainly in scenes where users watch movies and television
programs closely.
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1
However, when considering the viewing condition of a large screen television exceeding 100
inches, for example, natural images are displayed in a BGM casually manner, or the appearance
of another room or the outdoors is as if there. There is a use scene that has never been seen,
such as displaying. In that case, the relationship between the screen position and the viewing
position is more flexible than a television with a small screen.
[0003]
For example, in the case of a television with a small screen, the user needs to be located near the
television screen in order to view the displayed image, but if the screen is large, the image can be
viewed sufficiently even if it is far from the television screen it can. Also, as described above,
when a natural video is displayed in BGM, the user is not always looking closely at the video, so it
is not necessarily located near the screen. Absent.
[0004]
Therefore, in the case of a television in which a speaker and a screen are integrally provided, at a
normal volume, a user located away from the screen can not listen to voice. Also, if the volume is
increased so that a user away from the screen can listen to the sound of the television, the
volume is too large for the user watching the television near the screen, and it is not possible to
view comfortably.
[0005]
In such a situation, it is not necessary to provide the speakers and the screen integrally, for
example, by arranging the wireless speakers in the center of the room or by arranging a plurality
of the speakers at various places in the room. A configuration in which the
[0006]
By the way, polyhedral speakers have come to be used in recent years.
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For example, Patent Document 1 discloses an acoustic device in which a plurality of speakers are
disposed on one circumference in one casing, and automatic adjustment is performed to a correct
sound image for a listener who performs remote control operation. .
[0007]
In the configuration of Patent Document 1, in order to realize multi-channel surround
reproduction, a configuration is disclosed in which audio signals of different channels are
supplied to each speaker unit constituting a polyhedral speaker, and different audio is
reproduced in each speaker unit. However, a configuration is conceivable in which the same
audio signal is supplied to each of the speaker units constituting the polyhedral speaker, and the
same audio is reproduced in each of the speaker units.
[0008]
Then, it is conceivable to apply a polyhedral speaker in order to realize a more comfortable
viewing environment in the above-described large screen television exceeding 100 inches.
JP-A-8-182098 (published on July 12, 1996)
[0009]
However, the speaker of the above polyhedron is applied to a large screen television, the same
sound signal of the same phase and the same amplitude is supplied to each speaker unit
constituting the polyhedron speaker, and the same sound is reproduced in each speaker unit In
the case of the configuration described above, since each speaker unit points in a different
direction, the sound output from each speaker unit is a sound of a different phase and amplitude
to the listener as a result of the influence of the reflection of the room. To reach as. Also, the
higher the frequency characteristic is, the lower the position away from the center of the speaker
due to the directivity characteristic of the speaker.
[0010]
FIG. 7 is a diagram showing the waveform of the original sound reproduced by the polyhedral
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speaker, the waveform at the listening position of the sound outputted from each speaker unit,
and an image of the synthesized waveform thereof. FIG. 7 (a) is a diagram showing an image of
the waveform of the original sound, and FIG. 7 (b) is a diagram showing an image of the
waveform at the listening position of the sound outputted from the front speaker unit. Is a
diagram showing an image of a waveform at a listening position of sound output from the side
speaker unit, and FIG. 7 (d) is a diagram showing an image of a waveform at a listening position
of sound output from a rear speaker unit FIG.7 (e) is a figure which shows the image of the
waveform which synthesize ¦ combined the waveform of (b)-(d). As shown in FIG. 7B, the
waveform of the sound output from the front speaker unit shows substantially the same
waveform as the original sound at the listening position, and becomes a sound substantially
similar to the original sound. Further, as shown in FIGS. 7C and 7D, in the waveform of the sound
output from the speaker unit on the side and the speaker unit on the back, the high frequency
component is deteriorated due to the influence of the directivity characteristic, and the signal
does not rise. Maru. Then, the waveform of the sound at the listening position, that is, the
waveform of the sound obtained by combining the waveforms of FIGS. 7B to 7D is largely
changed from the waveform shown in FIG. 7A, as shown in FIG. You can see that Although FIG. 7
shows an image of the waveform of the sound that directly reaches the listening position from
the speaker unit, actually, the reflected sound from the wall or floor also reaches the listening
position.
[0011]
As a result, finally, at the position of the listener, the reflected sound from the wall or floor is
synthesized, so that sounds of different phases and amplitudes are synthesized. Therefore, the
dullness of the waveform is further aggravated, and further, the fluctuation of the amplitude
occurs, the sound clarity is lost, and there is a problem that a comfortable acoustic environment
can not be realized for the listener.
[0012]
The present invention has been made in view of the above-mentioned conventional problems,
and its object is to impair the clarity of the sound at the listening position in the case of
outputting the sound by the speaker constituted by including a plurality of speaker units. It is an
object of the present invention to provide an audio reproduction apparatus, an audio
reproduction method, an audio reproduction system, a control program, and a computer readable
recording medium that can realize a comfortable acoustic environment for a listener.
[0013]
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An audio reproduction apparatus according to the present invention is an audio reproduction
apparatus that reproduces audio through a plurality of speakers including a plurality of speaker
units, and for each of the speakers, of the plurality of speaker units constituting the speaker, A
detection unit that detects a speaker unit located closest to a user's listening position, and, for
each of the speakers, a selection that selects the speaker unit detected by the detection unit as a
speaker unit that outputs sound in the speaker And means.
[0014]
According to the above configuration, the audio reproduction device reproduces the audio
through the plurality of speakers.
And each speaker is comprised by several speaker units, such as a polyhedron speaker, for
example.
[0015]
Further, according to the above configuration, the detection means detects, for each of the
speakers, a speaker unit located closest to the user's listening position among the speaker units
constituting each speaker.
That is, the detection means detects one speaker unit closest to the user's listening position for
each of the above speakers.
[0016]
Further, according to the above configuration, the selection unit selects each of the speaker units
detected by the detection unit as a speaker unit that outputs the sound in each of the speakers.
That is, the selection unit selects one speaker unit closest to the user's listening position as a
speaker unit for outputting sound, for all the speakers.
[0017]
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That is, according to the audio reproduction device according to the present invention, audio can
be output from one speaker unit closest to the user's listening position in a plurality of speakers
constituted by a plurality of speaker units.
[0018]
Thus, according to the audio reproduction device of the present invention, audio is not output
from the plurality of speaker units in one speaker configured by the plurality of speaker units.
Therefore, a plurality of sounds having different amplitudes and phases do not reach the
listening position from one speaker. In addition, since the sound is output from the speaker unit
closest to the user's listening position among the plurality of speaker units constituting the
speaker, the influence of the reflection by the wall, the floor or the like can be reduced.
Therefore, with respect to the sound output from each speaker, since a plurality of sounds having
different amplitudes and phases are not synthesized at the listening position, the rounding of the
sound pressure waveform reaching the listener's ear can be reduced. , Users will be able to listen
to clear sound quality voice.
[0019]
An audio reproduction method according to the present invention is an audio reproduction
method for reproducing audio through a plurality of speakers comprising a plurality of speaker
units, and for each of the speakers, of the plurality of speaker units constituting the speaker, A
detection step of detecting a speaker unit positioned closest to a user's listening position; and
selecting, for each of the speakers, the speaker unit detected by the detection means as a speaker
unit for outputting sound in the speaker And a step is included.
[0020]
According to the above configuration, the same operation and effect as the audio reproduction
device according to the present invention can be obtained.
[0021]
In the audio reproduction apparatus according to the present invention, the detection means
outputs, for each of the speakers, the audio with the largest amplitude at the listening position
among the audio output from the plurality of speaker units based on the same audio signal. It is
preferable to detect the speaker unit that is located as the speaker unit located closest to the
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listening position.
[0022]
According to the above configuration, the detection unit detects the amplitude at the listening
position of the sound waveform output from each of the speaker units constituting the speaker
and outputs the sound with the maximum amplitude for each of the speakers. Is detected as the
speaker unit disposed closest to the listening position.
[0023]
Thereby, the detection of the speaker unit located closest to the listening position can be
accurately performed with a simple configuration.
[0024]
In the audio reproduction apparatus according to the present invention, the detection means has
a minimum delay with respect to the audio signal at the listening position among the audio
output from the plurality of speaker units based on the same audio signal for each speaker. It is
preferable to detect a speaker unit that outputs the sound of the speaker unit as a speaker unit
located closest to the listening position.
[0025]
According to the above configuration, the detection unit detects, for each of the speakers, a delay
in the listening position of the sound waveform output from each of the speaker units
constituting the speaker, and outputs the sound with the minimum delay. Is detected as the
speaker unit disposed closest to the listening position.
[0026]
Thereby, the detection of the speaker unit located closest to the listening position can be
accurately performed with a simple configuration.
[0027]
In the sound reproducing apparatus according to the present invention, the sound to each
speaker is set such that the phases of all the sounds output from the speaker units selected by
the selecting unit in the speakers are equal at the listening position. Preferably, the apparatus
further comprises delay means for delaying the supply of the signal.
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[0028]
According to the above configuration, the delay means supplies the phases of the sound output
from the speaker unit selected as the speaker unit for outputting the sound of each speaker to
the respective speakers so as to be equal at the listening position. Delay the audio signal.
For example, at the timing when the sound output from the speaker farthest from the listening
position reaches the listening position, the audio signal supplied to the other speaker is also
supplied to the other speakers so that the audio output from the other speakers also reaches the
listening position Delay every.
Alternatively, the audio signal supplied to each speaker may be delayed for each speaker so that
the sound output from each speaker reaches the listening position at a predetermined delay time,
and is not particularly limited.
[0029]
As a result, the sounds output from all the speakers are in phase at the listening position.
For this reason, in the listening position, since the voices having different phases are not
synthesized, it is possible to reduce the dullness of the sound pressure waveform reaching the
listener's ear, and the user listens to the voice of clear sound quality. Will be able to
[0030]
In the sound reproducing apparatus according to the present invention, the amplitudes of all the
sounds output from the respective speaker units selected by the selection means in the
respective speakers are supplied to the respective speakers so as to be equal at the listening
position. It further comprises amplitude adjustment means for changing the magnitude of the
audio signal.
[0031]
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8
According to the above configuration, the amplitude adjusting means supplies the amplitudes of
the sound output from the speaker unit selected as the speaker unit for outputting the sound of
each speaker to the respective speakers so as to be equal at the listening position. Change the
magnitude of the audio signal to be
For example, the magnitude of the audio signal supplied to the other speakers such that the
amplitude at the listening position of the sound output from the speaker closest to the listening
position and the amplitude at the listening position of the sound output from the other speakers
are equal. Varies from speaker to speaker.
Alternatively, the magnitude of the audio signal supplied to each speaker may be changed for
each speaker so that the amplitude at the listening position of the sound output from each
speaker becomes a predetermined size, and the limitation is particularly limited. I will not.
[0032]
Thus, the sounds output from all the speakers have equal amplitude at the listening position.
For this reason, since voices of different amplitudes are not synthesized at the listening position,
it is possible to reduce the dullness of the sound pressure waveform reaching the listener's ear,
and the user listens to the voice of clear sound quality. Will be able to
[0033]
In the audio reproduction apparatus according to the present invention, the amplitude frequency
characteristics of all the audio output from each of the speaker units selected by the selection
means in each of the speakers are substantially constant at least in the audio frequency band at
the listening position. Thus, it is preferable to further include frequency characteristic correction
means for giving correction characteristics to the audio signals supplied to the respective
speakers.
[0034]
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9
According to the above configuration, the frequency characteristic correction means is
configured such that the amplitude frequency characteristic of the sound output from the
speaker unit selected as the speaker unit for outputting the sound of each speaker is
substantially at least at the listening frequency band at the listening position. A correction
characteristic is given to the audio signal supplied to each speaker so as to be constant.
The amplitude frequency characteristic may be flat in the entire frequency band, and is not
particularly limited.
[0035]
As a result, since the peaks and dips of the amplitude frequency characteristic are canceled at the
listening position and the sound output from all the speakers becomes flat amplitude frequency
characteristic, the voice can be reproduced more faithfully to the original sound at the listening
position. .
[0036]
An audio reproducing apparatus according to the present invention is an audio reproducing
apparatus that reproduces audio through a speaker including a plurality of speaker units, and
among the speaker units, the speaker unit located closest to the user's listening position is It is
characterized by comprising detection means for detecting, and selection means for selecting a
speaker unit detected by the detection means as a speaker unit for outputting sound.
[0037]
According to the above configuration, the audio reproduction device reproduces the audio
through a speaker including a plurality of speaker units, such as a polyhedral speaker, for
example.
[0038]
Moreover, according to said structure, a detection means detects the speaker unit located nearest
to a user's listening position among the speaker units which comprise a speaker.
That is, the detection means detects one speaker unit closest to the user's listening position.
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[0039]
Further, according to the above configuration, the selection unit selects the speaker unit detected
by the detection unit as a speaker unit that outputs sound.
That is, the selection means selects one speaker unit closest to the user's listening position as a
speaker unit for outputting sound.
[0040]
That is, according to the audio reproduction device according to the present invention, audio can
be output from one speaker unit closest to the user's listening position in a plurality of speakers
constituted by a plurality of speaker units.
[0041]
Thus, according to the audio reproduction device of the present invention, audio is not output
from the plurality of speaker units in one speaker configured by the plurality of speaker units.
Therefore, a plurality of sounds having different amplitudes and phases do not reach the
listening position.
In addition, since the sound is output from the speaker unit closest to the user's listening position
among the plurality of speaker units constituting the speaker, the influence of the reflection by
the wall, the floor or the like can be reduced.
Therefore, since a plurality of voices different in amplitude and phase are not synthesized at the
listening position, it is possible to reduce the dullness of the sound pressure waveform reaching
the listener's ear, and the user can You will be able to hear the audio.
[0042]
An audio reproduction method according to the present invention is an audio reproduction
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method for reproducing audio through a speaker including a plurality of speaker units, and
among the above speaker units, the speaker unit located closest to the user's listening position is
It is characterized by including a detection step of detection and a selection step of selecting the
speaker unit detected by the detection means as a speaker unit for outputting sound.
[0043]
According to the above configuration, the same operation and effect as the audio reproduction
device according to the present invention can be obtained.
[0044]
In the audio reproduction apparatus according to the present invention, the detection unit is a
speaker unit that outputs the audio with the largest amplitude at the listening position among the
audio output from the plurality of speaker units based on the same audio signal, It is preferable
to detect as a speaker unit located closest to the listening position.
[0045]
According to the above configuration, the detection means detects the amplitude at the listening
position of the audio waveform outputted from each of the speaker units constituting the
speaker, and outputs the audio with the largest amplitude as the speaker position which is the
most at the listening position. It detects as a speaker unit arranged near.
[0046]
Thereby, the detection of the speaker unit located closest to the listening position can be
accurately performed with a simple configuration.
[0047]
In the audio reproduction apparatus according to the present invention, the detection unit is a
speaker unit that outputs an audio with a minimum delay at the listening position among audios
output from the plurality of speaker units based on the same audio signal, It is preferable to
detect as a speaker unit located closest to the listening position.
[0048]
According to the above configuration, the detection means detects the delay in the listening
position of the audio waveform outputted from each speaker unit constituting the speaker, and
outputs the audio with the minimum delay as the speaker position which is the most at the
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listening position. It detects as a speaker unit arranged near.
[0049]
Thereby, the detection of the speaker unit located closest to the listening position can be
accurately performed with a simple configuration.
[0050]
An audio reproduction system according to the present invention collects the above-described
audio reproduction device and the audio output from the above-described audio reproduction
device, converts the collected audio into an electrical reception signal, and outputs the signal to
the above-described audio reproduction device. And a microphone.
[0051]
According to the above configuration, the audio reproduction device supplies an audio signal to
the speaker.
Then, from each speaker unit, sound is output based on the sound signal supplied to the speaker.
Furthermore, the microphone picks up the sound output from each speaker unit, converts it into
a reception signal, and outputs it to the above-mentioned sound reproduction apparatus.
[0052]
Thus, the audio reproduction device detects the speaker unit located closest to the user's
listening position based on the reception signal of the audio from each of the speaker units
collected by the microphone, and outputs the audio. Speaker unit can be selected.
Therefore, no sound is output from the plurality of speaker units in one speaker configured by
the plurality of speaker units.
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Therefore, a plurality of voices having different amplitudes and phases do not reach the listening
position, and a plurality of voices having different amplitudes and phases are not synthesized at
the listening position, and thus reach the listener's ear A dullness of the sound pressure
waveform can be reduced, and a voice reproduction system can be realized in which the user can
listen to a clear sound.
[0053]
In addition, the audio reproduction device may be realized by a computer.
In this case, a control program for realizing the above-described audio reproduction device on a
computer by operating the computer as the above respective means, and a computer readable
recording medium recording the control program also fall within the scope of the present
invention.
[0054]
An audio reproduction apparatus according to the present invention is an audio reproduction
apparatus that reproduces audio through a plurality of speakers including a plurality of speaker
units, and for each of the speakers, of the plurality of speaker units constituting the speaker, A
detection unit that detects a speaker unit located closest to a user's listening position, and, for
each of the speakers, a selection that selects the speaker unit detected by the detection unit as a
speaker unit that outputs sound in the speaker And means.
[0055]
An audio reproduction apparatus that reproduces audio via a speaker including a plurality of
speaker units, wherein the detection unit detects a speaker unit located closest to a user's
listening position among the speaker units, and And a selection unit configured to select the
speaker unit detected by the detection unit as the speaker unit for outputting the sound.
[0056]
Thereby, since a plurality of sounds having different amplitudes and phases do not reach the
listening position from one speaker, it is possible to reduce the rounding of the sound pressure
waveform reaching the listener's ear, and the user Will be able to listen to clear sound quality
voice.
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14
[0057]
(Audio Reproduction Device 1) The following describes an audio reproduction device 1 according
to an embodiment of the present invention with reference to FIGS.
FIG. 1 is a block diagram showing the configuration of an audio reproduction apparatus 1
according to the present invention.
As shown in FIG. 1, the audio reproduction device 1 includes an input terminal 2, an analog-todigital converter (ADC) 3, a delay circuit 4 (delay means), a frequency correction unit 5
(frequency characteristic correction means), and a gain adjustment unit 6 (amplitude adjustment
Means, selection circuit 7, digital analog converter (DAC) 8, amplifier 9, speaker selection circuit
10 (selection means), test signal generation circuit 11, delay amount detection unit 12, amplitude
detection unit 13 and analog digital converter (ADC) 14, a control unit 15, and a memory 16.
[0058]
Further, as shown in FIG. 1, a speaker 17 is connected to the audio reproduction device 1.
The speaker 17 is configured to include speaker units 17a, 17b, 17c, 17d, 17 and 17f.
The appearance of the speaker unit is, as shown in FIG. 2, a hexahedral shape, and speaker units
17a to 17f are arranged on six sides.
[0059]
FIG. 2 is a diagram showing the configuration of the audio reproduction system 100. As shown in
FIG.
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15
As shown in FIG. 2, the audio reproduction device 1 constitutes an audio reproduction system
100 together with the speakers 17 and 17 ′ and the microphone 18.
In the present embodiment, the audio reproduction device 1 wirelessly supplies an audio signal
to the speakers 17 and 17 '.
Similarly, the audio reproduction device 1 receives an audio signal from the microphone 18
wirelessly.
However, the audio reproduction device 1 may be connected to the speakers 17 and 17 'and the
microphone 18 by a communication cable, and is not particularly limited.
Further, in the present embodiment, the audio reproduction device 1 is configured to receive an
audio signal from the outside, but may be configured to have a reproduction function of a
compact disc or a cassette tape, and is not particularly limited.
[0060]
In the present embodiment, the audio reproduction system 100 is configured as a stereo
reproduction system, and an audio signal of L channel and an audio signal of R channel are input
to the music reproduction device 1.
The speaker 17 outputs sound based on the L channel audio signal, and the speaker 17 ′
outputs sound based on the R channel audio signal. Also, the microphone 18 can pick up the
sound output from the speakers 17 and 17 'and convert it into an electrical sound signal. In the
present embodiment, the same L channel signal is supplied to the speaker units 17a to 17f
constituting the hexahedral speaker 17. Similarly, the same R channel signal is supplied to the
speaker units 17'a to 17f constituting the speaker 17 '.
[0061]
Below, the outline ¦ summary of the function of each part which comprises the audio
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reproduction apparatus 1 is demonstrated. In FIG. 1, only the speaker 17 is shown for simplicity,
and only the configuration for controlling the audio reproduction of the L channel audio signal is
shown, but the audio reproduction device 1 is not limited to the audio signal of the R channel.
The voice reproduction of is controlled by the same configuration.
[0062]
The input terminal 2 is a terminal for inputting an audio signal from the outside to the audio
reproduction device 1. The ADC 3 converts an L channel audio input signal, which is an analog
signal input through the input terminal 2, into an L channel digital signal (hereinafter referred to
as an Lch signal), and outputs the L channel digital signal to the delay circuit 4. In the music
reproduction device 1, the audio input signal of the R channel is converted into a digital signal of
the R channel (hereinafter referred to as an Rch signal).
[0063]
The delay circuit 4 delays the Lch signal and outputs it to the frequency characteristic correction
unit 5. The frequency characteristic correction unit 5 corrects the frequency characteristic of the
Lch signal and outputs the corrected signal to the gain adjustment unit 6. The frequency
characteristic correction unit 5 filters the Lch signal so as to obtain a desired frequency
characteristic, and adjusts the gain of the Lch signal in a specific frequency region. The gain
adjusting unit 6 adjusts the gain of the entire Lch signal and outputs the adjusted signal to the
selection circuit 7. Further, in the audio reproduction device 1, test sound is reproduced through
the speaker 17 based on the test signal generated by the test signal generation circuit 11. At this
time, the test signal generation circuit 11 outputs a test signal to the selection circuit 7. The test
signal data representing the test signal is stored in the memory 16, and is supplied to the test
signal generation circuit 11 by the control unit 15. Further, in the present embodiment, the test
signal is generated as one signal supplied to the speaker units 17a to 17f in a time division
manner.
[0064]
The selection circuit 7 selects which of the Lch signal from the gain adjustment unit 6 and the
test signal from the test signal generation circuit 11 is to be output based on the control signal
from the control unit 15, and selects the selected signal to the DAC 8. Output. When the Lch
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signal which is a digital signal is selected in the selection circuit 7, the DAC 8 converts the Lch
signal into an analog Lch signal and outputs the Lch signal to the amplifier 9. When a test signal
which is a digital signal is selected, the DAC 8 converts it into an analog test signal and outputs it
to the amplifier 9. The amplifier 9 amplifies the Lch signal or the test signal and outputs the
amplified signal to the speaker selection circuit 10. Then, when the Lch signal is output from the
amplifier 9, the speaker selection circuit 10 outputs the sound based on the Lch signal among
the speaker units 17 a to 17 f configuring the speaker 17 according to the control signal from
the control unit 15. Select the speaker unit to output. Further, in the present embodiment, when
the test signal is output from the amplifier 9, the test signal supplied to the speaker units 17a to
17f is supplied in time division by one signal. In this case, in the speaker selection circuit 10,
based on the control signal from the control unit 15, the speaker units that output the test sound
are sequentially switched according to the timing at which the test signal corresponding to each
speaker unit is supplied.
[0065]
The microphone 18 picks up the test voice output from the speaker 17 (that is, the test voice
sequentially output from the speaker units 17a to 17f), and converts it into an electrical signal
(hereinafter referred to as a reception signal), The signal is output to the ADC 14 through an
input interface (not shown) for the microphone. The ADC 14 converts the above received signal
from an analog signal to a digital signal, and outputs the converted signal to the amplitude
detection unit 13. Furthermore, the amplitude detection unit 13 detects the maximum value of
the amplitude among the received signals of the test sound output from the speaker units 17a to
17f and collected by the microphone 18, and outputs the detection result to the control unit 15. ,
And outputs the received signal to the delay amount detection unit 12. In addition, the delay
amount detection unit 12 detects the delay amount with respect to the test signal which is the
original signal of the test sound from the received signal of the test sound from each speaker
unit, and outputs the detection result to the control unit 15. In the present embodiment, the
delay amount detection unit 12, the amplitude detection unit 13, and the control unit 15 are
realized by a microcomputer. The delay amount detection unit 12 and the amplitude detection
unit 13 may be configured as dedicated circuits, and are not particularly limited.
[0066]
The audio reproduction device 1 according to the present invention is characterized in that the
speaker unit 17a to 17f constituting the speaker 17 selects a speaker unit closest to the position
of the listener as a speaker unit for outputting sound. doing.
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[0067]
In the present embodiment, the microphone 18 is installed at the listening position of the user,
and the audio reproduction device 1 detects the detection result of the maximum value from the
amplitude detection unit 13 or the delay amount from the delay amount detection unit 12. Based
on the detection result, in the speaker selection circuit 10 (selection means), a speaker unit
closest to the microphone 18 is selected as a speaker unit for outputting sound.
Here, the detection unit in the claims is realized by the delay amount detection unit 12, the
amplitude detection unit 13, and the control unit 15.
[0068]
Further, the audio reproduction device 1 according to the present invention outputs the detection
result of the maximum value from the amplitude detection unit 13 or the delay amount detection
unit 12 when performing audio output using a plurality of speakers composed of a plurality of
speaker units. The delay of the Lch signal in the delay circuit 4, the correction of the frequency
characteristic of the Lch signal in the frequency characteristic correction unit 5, and the
adjustment of the gain of the Lch signal in the gain adjustment unit 6 based on the detection
result of the delay amount , It has the feature also in the configuration which controls the audio
output between the speakers.
[0069]
Hereinafter, the characteristic configuration of the audio reproduction device 1 according to the
present invention will be described in more detail.
[0070]
(Selection of Speaker Unit) In the audio reproduction device 1 according to the present invention,
when selecting a speaker unit for outputting audio, test audio is output from each speaker unit
based on the test signal, and the microphone 18 picks up the test audio. Using the received signal
obtained by
[0071]
FIG. 3 is a diagram for explaining the detection of the speaker unit closest to the listening
position. FIG. 3A is a diagram showing a time waveform of a test signal supplied to each of the
speaker units 17a to 17f constituting the speaker 17. FIG. 8B is a diagram showing a time
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waveform of a reception signal in the microphone 18.
[0072]
The horizontal axis of FIG. 3 (a), (b) has shown time.
As shown in FIG. 3A, each of the test signals supplied to the speaker units 17a to f is one cycle of
a sine wave, and the waveforms themselves are the same, but the phases are the speaker units
17a, 17b, The test signals supplied to 17c, 17d, 17e and 17f are delayed in order.
That is, one cycle of the sine wave included in the test signal is temporally supplied in the order
of the speaker units 17a, 17b, 17c, 17d, 17e and 17f.
Also, as described above, the test signal data representing the test signal is stored in the memory
16, but the test signal data may be, for example, compressed audio signal data representing the
test signal itself. Alternatively, it may be stored as a parameter representing the amplitude,
frequency or the like of the test signal, and is not particularly limited.
[0073]
When the test voice is reproduced, the control unit 15 reads test signal data from the memory 16
and supplies the test signal data to the test signal generation circuit 11.
Then, the test signal generation circuit 11 generates a test signal based on the supplied test
signal data. For example, in the case of audio signal data in which test signal data is compressed,
the test signal generation circuit 11 performs decoding processing and performs expansion
processing of the audio signal. When the test signal data is a parameter, the test signal
generation circuit 11 generates a signal of a waveform specified by the parameter.
[0074]
09-05-2019
20
Further, in this case, the control unit 15 supplies the selection circuit 7 with a control signal
instructing to output a test signal. Thus, the selection circuit 7 outputs a test signal, and an
analog test signal is supplied to the speaker selection circuit 10 through the DAC 8 and the
amplifier 9.
[0075]
As described above, the test signal supplied to the speaker units 17a to 17f is supplied in a time
division manner by one signal, and the control unit 15 performs a test corresponding to each
speaker unit with respect to the speaker selection circuit 10. In accordance with the timing at
which the signal is supplied, a control signal for instructing switching of the speaker unit that
outputs the test sound is supplied.
[0076]
In addition, the test voice may be played back when the user performs an operation to start
listening to the voice playback device 1, or the user may operate the remote control (not shown).
The configuration may be performed according to the above, and is not particularly limited.
[0077]
Furthermore, the speaker units 17a to 17f output the test sound sequentially based on the test
signal shown in FIG.
Then, the microphone 18 picks up the test sound output from the speakers 17a to 17f and
converts it into a reception signal shown in FIG.
The reception signal shown in FIG. 3B shows an example in which the microphone 18 is disposed
at the position shown in FIG. That is, the reception signal shown in FIG. 3B shows a waveform in
the case where the microphone 18 is disposed in front of the speaker unit 17a constituting the
speaker 17. As shown in FIG. 3B, the received signal includes six waveforms of one cycle of sine
waves having different amplitudes. The waveform for one cycle of each sine wave shown in FIG.
3B corresponds to the test voice output from the speaker units 17a, 17b, 17c, 17d, 17e and 17f
in order from the left.
[0078]
09-05-2019
21
Here, as described above, the microphone 18 is disposed in front of the speaker unit 17 a that
constitutes the speaker 17. That is, the speaker unit 17a is located closest to the microphone 18
which is the user's listening position. On the other hand, the speaker unit 17c is located behind
the microphone 18 in the speaker 17, and is located farthest from the user's listening position.
[0079]
Then, as shown in FIG. 3B, among the waveforms of the reception signals corresponding to the
test voices from the respective speaker units, the amplitude of the waveform corresponding to
the speaker unit 17a located closest to the microphone 18 is maximized. The amplitude of the
waveform corresponding to the speaker unit 17c located farthest from the microphone 18 is
minimized. That is, it can be seen that the speaker unit corresponding to the waveform with the
largest amplitude among the waveforms included in the received signal is located closest to the
microphone 18 which is the user's listening position.
[0080]
Therefore, in the audio reproduction device 1 according to the present invention, after the
reception signal from the microphone 18 is converted from an analog signal to a digital signal in
the ADC 14, the signal is supplied to the amplitude detection unit 13, and the amplitude
detection unit 13 is included in the reception signal. Among the waveforms to be detected, the
waveform with the largest amplitude is detected. Then, the amplitude detection unit 13 outputs,
to the control unit 15, speaker unit detection information representing a speaker unit
corresponding to the waveform with the largest amplitude. As a result, in the audio reproduction
device 1, the speaker unit located closest to the user's listening position is detected.
[0081]
Furthermore, the control unit 15 outputs, to the speaker selection circuit 10, a control signal
instructing selection of the speaker unit designated by the above-mentioned speaker unit
detection information as the speaker unit for outputting sound. Then, the speaker selection
circuit 10 selects a speaker unit in accordance with the control signal from the control unit 15.
09-05-2019
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[0082]
That is, in the example shown in FIG. 3B, the amplitude detection unit 13 detects that the
amplitude of the waveform corresponding to the speaker unit 17a is maximum. Then, the
amplitude detection unit 13 outputs information representing the speaker unit 17 a to the
control unit 15 as speaker unit detection information. Further, the control unit 15 outputs a
control signal instructing the speaker selection circuit 10 to select the speaker unit 17a as a
speaker unit for outputting sound. Then, the speaker selection circuit 10 selects the speaker unit
17 a in accordance with the control signal from the control unit 15. Thereby, in the audio
reproduction device 1 according to the present embodiment, of the speaker units 17a to 17f
constituting the speaker 17, the sound is output only from the speaker unit 17a.
[0083]
The above configuration is configured to detect the speaker unit closest to the user's listening
position based on the amplitude of the waveform included in the received signal, but the delay
amount of the received signal with respect to the test signal supplied to each speaker unit Based
on the configuration, a speaker unit closest to the user's listening position may be detected. The
configuration will be described in more detail as follows.
[0084]
In the audio reproduction device 1 according to the present invention, the received signal from
the microphone 18 is converted from an analog signal to a digital signal in the ADC 14 and then
supplied to the amplitude detection unit 13. Further, the amplitude detection unit 13 outputs the
received signal to the delay amount detection unit 12. Further, the test signal generation circuit
11 outputs a test signal, which is an original signal of test sound output from each speaker unit,
to the delay amount detection unit 12.
[0085]
Then, the delay amount detection unit 12 detects the delay amount with respect to the test signal
of the original signal with respect to the reception signal of the test sound output from each
09-05-2019
23
speaker unit. The amount of delay decreases as the distance between the speaker unit and the
microphone 18 decreases. Therefore, the speaker unit corresponding to the received signal with
the minimum amount of delay is located closest to the position of the microphone 18 (ie, the
listening position).
[0086]
In the present embodiment, the delay amount detection unit 12 outputs the test signal supplied
to each speaker unit shown in FIG. 3A and the microphone 18 of the test voice output from each
speaker unit shown in FIG. 3B. And the amount of delay of the received signal with respect to the
test signal is detected for each speaker unit. Then, the delay amount detection unit 12 outputs, to
the control unit 15, speaker unit detection information representing the speaker unit with the
smallest delay amount. As a result, in the audio reproduction device 1, the speaker unit located
closest to the user's listening position is detected. That is, in the example shown in FIG. 3B, since
the delay amount of the speaker unit 17a is the smallest, the delay amount detection unit 12
outputs information representing the speaker unit 17a to the control unit 15 as speaker unit
detection information. .
[0087]
Further, the control unit 15 outputs, to the speaker selection circuit 10, a control signal
instructing to select the speaker unit 17a designated by the above-mentioned speaker unit
detection information as a speaker unit for outputting sound. Then, the speaker selection circuit
10 selects the speaker unit 17 a according to the control signal from the control unit 15.
Thereby, in the audio reproduction device 1 according to the present embodiment, of the speaker
units 17a to 17f constituting the speaker 17, the sound is output only from the speaker unit 17a.
[0088]
As a result, no sound is output from a plurality of speaker units in one speaker 17 configured by
the speaker units 17a to 17f. Therefore, a plurality of sounds having different amplitudes and
phases do not reach the listening position from the speaker 17. Moreover, since the sound is
output from the speaker unit 17a closest to the user's listening position among the plurality of
speaker units 17a to 17f constituting the speaker 17, the influence of the reflection by the wall,
09-05-2019
24
the floor or the like can be reduced. Therefore, since a plurality of voices different in amplitude
and phase are not synthesized at the listening position, it is possible to reduce the dullness of the
sound pressure waveform reaching the listener's ear, and the user can You will be able to hear
the audio.
[0089]
(Adjustment Between Two Loudspeakers) As described above, the audio reproduction device 1
according to the present invention outputs audio only from the speaker unit closest to the
listening position in the speaker including a plurality of speaker units. Furthermore, the audio
reproduction apparatus 1 according to the present invention controls an audio output between
speakers in an audio reproduction system including a plurality of speakers composed of a
plurality of speaker units.
[0090]
Below, the structure which adjusts the audio ¦ voice output between the speakers 17 and 17
'which comprise the stereo sound reproduction system shown in FIG. 2 is demonstrated.
[0091]
FIG. 4 is a diagram showing the positional relationship between the speakers 17 and 17
'constituting the stereo reproduction system shown in FIG. 2 and the listener.
As shown in FIG. 4, the installation position (that is, the listening position) of the microphone 18
is in front of the speaker 17 and is closer to the speaker 17 than the speaker 17 ′. A
microphone 18 is installed at the position of the listener shown in FIG. 4 as shown in FIG.
[0092]
Moreover, as shown in FIG. 2, the speakers 17 and 17 'are both hexahedral speakers comprised
by six speaker units. Then, when adjusting the audio output between the speakers, the audio
reproduction device 1 first detects the speaker unit closest to the listening position for each of
the speakers 17 and 17 ′ by the method described above, and outputs the audio. It has been
09-05-2019
25
selected as a speaker unit. That is, from the speakers 17 and 17 ', sound is output from only one
of the six speaker units.
[0093]
Then, in the audio reproduction device 1 according to the present invention, when adjusting the
audio output between the speakers, the test sound is output from each speaker based on the test
signal, and the received signal obtained by collecting the sound by the microphone 18 is
obtained. Use to adjust.
[0094]
FIG. 5 is a diagram for explaining control of audio output between two speakers, where (a) shows
a time waveform of a test signal supplied to the speakers 17 and 17 ′, and (b) shows It is a
figure which shows the time waveform of the received signal in the microphone 18 of the test
audio ¦ voice output from speaker 17 and 17 '.
[0095]
The horizontal axes in FIGS. 5 (a) and 5 (b) indicate time.
As shown in FIG. 5 (a), each test signal supplied to the speakers 17 and 17 'is one cycle of a sine
wave, and although the waveforms themselves are the same, the test supplied to the speaker 17'
The signal is delayed in phase compared to the test signal supplied to the speaker 17.
That is, the timing at which one cycle of the sine wave included in the test signal is supplied to
the speaker 17 ′ is later than the timing at which the speaker 17 is supplied. Further, as in the
description of the test signal in FIG. 3, the memory 16 stores test signal data representing the
test signal.
[0096]
When the test voice is reproduced, the control unit 15 reads test signal data from the memory 16
and supplies the test signal data to the test signal generation circuit 11. Then, the test signal
generation circuit 11 generates a test signal based on the supplied test signal data.
09-05-2019
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[0097]
Further, in this case, the control unit 15 supplies the selection circuit 7 with a control signal
instructing to output a test signal. Thus, the selection circuit 7 outputs a test signal, and the
analog signal shown in FIG. 5A is supplied to the speaker selection circuit 10 through the DAC 8
and the amplifier 9. And the speaker 17 outputs a test sound based on the test signal shown to
Fig.5 (a).
[0098]
Although only the speaker 17 is shown in FIG. 1, the same test signal is supplied to the speaker
17 'by the same configuration. Then, the speaker 17 'outputs a test sound based on the test
sound shown in FIG. 5 (a).
[0099]
Then, the microphone 18 picks up the test sound output from the speakers 17 and 17 'and
converts it into a reception signal shown in FIG. 5 (b). The reception signal shown in FIG. 5B
shows an example in which the microphone 18 is disposed at a position closer to the speaker 17
as compared to the speaker 17 ', as shown in FIG. As shown in FIG. 5 (b), the reception signal
includes two waveforms of one cycle of sine waves having different amplitudes, which
correspond to the test voices output from the speakers 17 and 17 ', respectively.
[0100]
As described above, the microphone 18 is installed at a position closer to the speaker 17 than the
speaker 17 ′. Therefore, in the example shown in FIG. 5B, the amplitude of the received signal
corresponding to the test sound output from the speaker 17 is larger than the amplitude of the
received signal corresponding to the test sound output from the speaker 17 ′. . Further, the
delay amount of the reception signal with respect to the test signal of the speaker 17 is smaller
than the delay amount of the reception signal with respect to the test signal of the speaker 17 ′.
09-05-2019
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[0101]
For this reason, based on the same audio ¦ voice signal, the audio ¦ voice output from two
speakers differs in a phase and an amplitude in a listening position. Therefore, at the listening
position, voices with different phases and amplitudes are synthesized, so that the waveform of
the sound reaching the user's ear becomes dull and the clarity is lost.
[0102]
Therefore, in the audio reproduction device 1 according to the present invention, between the
speakers so that the waveform of the audio output from the speakers 17 and 17 'based on the
same audio signal becomes the same waveform at the listening position. Adjust the audio output.
In the following, the configuration of adjusting the audio output between the speakers in the
audio reproduction device 1 will be described in more detail.
[0103]
The microphone 18 picks up the test sound output from the speakers 17 and 17 'and converts it
into a reception signal shown in FIG. 5 (b). Further, in the audio reproduction device 1, the
received signal from the microphone 18 is converted from an analog signal to a digital signal in
the ADC 14 and then supplied to the amplitude value detection unit 13. Then, the amplitude
value detection unit 13 corresponds to the amplitude of the received signal corresponding to the
test sound output from the speaker 17 (referred to as the amplitude of the received signal from
the speaker 17) and the test sound output from the speaker 17 ′. The amplitude of the received
signal (referred to as the amplitude of the received signal from the speaker 17 ′) is detected and
output to the control unit 15.
[0104]
The control unit 15 calculates the ratio between the amplitude of the reception signal from the
speaker 17 and the amplitude of the reception signal from the speaker 17 ′ and writes the ratio
in the memory 16. When the control unit 15 outputs voice from the speakers 17 and 17 ′, the
09-05-2019
28
amplitude of the waveform of the voice output from the speakers 17 and 17 ′ based on the
same voice signal at the listening position using the above ratio Make adjustments so that are the
same.
[0105]
For example, when the amplitude of the received signal from the speaker 17 shown in FIG. 5B is
four times the amplitude of the received signal from the speaker 17 ′, the control unit 15
determines the level value of the audio signal supplied to the speaker 17. The gain adjustment
unit 6 is controlled so as to be 1/4 of the level value of the audio signal supplied to the speaker
17 '. More specifically, when audio signals having the same amplitude are supplied as the Lch
signal and the Rch signal, the control unit 15 reduces the gain to 1⁄4 of the gain adjustment unit
6 that adjusts the gain of the Lch signal. A control signal representing an instruction to set is
supplied, and a control signal representing an instruction to set the gain to 1 is supplied to a gain
adjustment unit (not shown) that adjusts the gain of the Rch signal. Alternatively, the control unit
15 may control the gain adjustment unit 6 so that the level value of the audio signal supplied to
the speaker 17 ′ is four times the level value of the audio signal supplied to the speaker 17.
There is no particular limitation.
[0106]
Thereby, the audio ¦ voices output from the speakers 17 and 17 'become equal in amplitude in a
listening position. For this reason, since voices of different amplitudes are not synthesized at the
listening position, it is possible to reduce the dullness of the sound pressure waveform reaching
the listener's ear, and the user listens to the voice of clear sound quality. Will be able to
[0107]
Further, in the audio reproduction device 1, as described above, the reception signal from the
microphone 18 is supplied to the amplitude value detection unit 13, but the amplitude value
detection unit 13 further supplies the reception signal to the delay amount detection unit 12. .
Further, the test signal generation circuit 11 outputs a test signal, which is an original signal of
test sound output from each speaker unit, to the delay amount detection unit 12.
09-05-2019
29
[0108]
The delay amount detection unit 12 compares the test signal supplied to each speaker shown in
FIG. 5A with the received signal at the microphone 18 of the test sound output from each
speaker shown in FIG. The delay amount of the received signal with respect to the test signal is
detected for each speaker. Then, the delay amount detection unit 13 determines the delay
amount of the received signal with respect to the test signal of the speaker 17 (referred to as the
delay amount of the received signal from the speaker 17 ′) and the delay amount of the
received signal with respect to the test signal of the speaker 17 ′ (speaker And the delay
amount of the received signal from 17 'is output to the control unit 15.
[0109]
The control unit 15 calculates a difference value between the delay amount of the reception
signal from the speaker 17 and the delay amount of the reception signal from the speaker 17 ′
and writes the difference value in the memory 16. When the control unit 15 outputs the sound
from the speakers 17 and 17 ′, the phase of the sound output from the speakers 17 and 17 ′
based on the same sound signal at the listening position is obtained using the above difference
value. Make adjustments to be identical.
[0110]
For example, when the delay amount of the reception signal from the speaker 17 shown in FIG.
5B is smaller by 0.1 ms than the delay amount of the reception signal from the speaker 17 ′,
the control unit 15 outputs an audio signal to the speaker 17 ′. The delay circuit 4 is controlled
so as to supply an audio signal to the speaker 17 with a delay of 0.1 ms with respect to the
timing of supplying. More specifically, when audio signals with the same phase are supplied as
the Lch signal and the Rch signal, the control unit 15 delays the Lch signal by 0.1 ms with
respect to the delay circuit 4 that adjusts the delay of the Lch signal. A control signal
representing an instruction to cause the Rch signal to be supplied is supplied, and a control
signal representing an instruction not to delay the Rch signal is supplied to a delay circuit (not
shown) that adjusts the delay of the Rch signal. Alternatively, a control signal representing an
instruction to delay the Lch signal supplied to the speaker 17 by 0.2 ms is supplied to the delay
circuit 4 and the speaker to the delay circuit (not shown) that adjusts the delay of the Rch signal.
It may be configured to supply a control signal representing an instruction to delay the Rch
signal supplied to 17 ′ by 0.1 ms, and is not particularly limited.
09-05-2019
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[0111]
As a result, the sounds output from the speakers 17 and 17 'become in phase at the listening
position. For this reason, in the listening position, since the voices having different phases are not
synthesized, it is possible to reduce the dullness of the sound pressure waveform reaching the
listener's ear, and the user listens to the voice of clear sound quality. Will be able to
[0112]
Further, in the audio reproduction device 1, the audio signal supplied to the speakers 17 and 17
'can be corrected so that the amplitude frequency characteristic at the listening position of the
audio output from the speakers 17 and 17' becomes flat (substantially constant). The process for
making the amplitude frequency characteristic flat in the audio reproduction device 1 will be
described below.
[0113]
First, the sound reproduction device 1 picks up the sound output from the speaker 17 by the
microphone 18 based on the test signal, and measures the amplitude frequency characteristic at
the listening position from the obtained reception signal. More specifically, for example, a
frequency sweep signal of a sine waveform is supplied to the speaker 17 as a test signal, voice
output based on the sweep signal is picked up by the microphone 18, and the amplitude of the
obtained reception signal is calculated. The frequency detection of the sound pressure at the
listening position is obtained by the detection by the amplitude detection unit 13. Usually, the
sound pressure in a certain frequency band rises and falls depending on the characteristics of the
speaker and the surrounding environment, and the amplitude frequency characteristic is not flat
but includes peaks and dips. The configuration for measuring the amplitude frequency
characteristic may use a test signal other than the sweep signal, and is not particularly limited.
[0114]
The amplitude detection unit 13 outputs the detected amplitude of the received signal to the
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31
control unit 15. The control unit 15 stores data of the amplitude frequency characteristic at the
listening position of the sound output from the speaker 17 in the memory 16. Further, the
control unit 15 calculates a filter having an inverse characteristic of the amplitude frequency
characteristic measured based on the test signal.
[0115]
When the voice is output from the speaker 17 based on the voice signal input from the outside,
the control unit 15 applies a filter with the calculated inverse characteristic to the frequency
characteristic correction unit 5 to the voice signal. Supply a control signal to indicate. The
frequency characteristic correction unit 5 may be configured as an equalizer (IIR filter) of a
plurality of bands, and may be configured to impart an inverse characteristic to the audio signal
according to the control signal from the control unit 15, or an FIR filter , And may be configured
to obtain filter coefficients representing correction characteristics (that is, inverse characteristics)
from the control unit 15 and to perform convolution operation on the audio signal, and is not
particularly limited. Further, the frequency characteristic correction unit 5 may be configured to
correct the amplitude frequency characteristic of the entire frequency band, or may be
configured to correct the amplitude frequency characteristic only in the audio frequency band,
and the present invention is not particularly limited. I will not.
[0116]
Then, after correcting the amplitude frequency characteristic of the sound output from the
speaker 17, the amplitude frequency characteristic is corrected by the same processing also for
the sound output from the speaker 17 '.
[0117]
As a result, the rise and fall (i.e., peaks and dips) of the amplitude frequency characteristic at the
listening position of the sound output from the speakers 17 and 17 'are canceled out, and a flat
sound pressure characteristic (i.e., amplitude frequency characteristic) with respect to frequency
is obtained. Since it is possible to correct, the sound can be reproduced more faithfully to the
original sound at the listening position.
[0118]
In the present embodiment, the configuration for controlling the audio output by two hexahedral
09-05-2019
32
speakers has been described, but the number of speakers controlled by the audio reproduction
device 1 according to the present invention is not limited to two.
For example, the audio reproduction device 1 may be configured to control the audio output by
one hexahedral speaker by the same method as in the case of controlling the audio output by two
hexahedral speakers, or six The configuration may be such that the audio output by the
hexahedral speaker is controlled.
[0119]
FIG. 6 is a view showing a situation in which sound is reproduced by six hexahedral speakers,
and (a) shows that in one speaker, the position speaker unit closest to the position of the listener
is selected. It is a figure and (b) is a figure showing that sound is outputted from a speaker unit
nearest to a listener's position among six speaker units which constitute a speaker in six
speakers.
[0120]
In the configuration shown in FIG. 6, each sound of the left channel (Lch), center channel (Cch),
right channel (Rch), right surround channel (RSch), subwoofer channel (SW), and left surround
channel (LSch) A speaker for outputting a signal is provided.
[0121]
Even in the case of outputting voice by six hexahedral speakers, as in the case of outputting voice
by two hexahedral speakers, the audio reproduction device 1 is a user among the speaker units
constituting a hexahedral speaker for each hexahedral speaker. The speaker unit closest to the
listening position is selected as a speaker unit for outputting sound.
[0122]
In the example shown in FIG. 6A, in the hexahedral speaker that outputs the Lch audio signal
surrounded by the dashed line, the audio represented by the solid arrow is more audible than the
audio represented by the dashed arrow. The amplitude of the waveform at the position is the
largest, and the amount of delay is the smallest.
Therefore, the audio reproduction device 1 selects, as the speaker unit for outputting the sound,
09-05-2019
33
the speaker unit for outputting the sound represented by the solid arrow in the hexahedral
speaker surrounded by the broken line shown in FIG. 6A.
[0123]
Furthermore, the audio reproduction device 1 sequentially selects the speaker unit closest to the
listening position also for each hexahedral speaker that outputs the Cch, Rch, RSch, SW, and LSch
audio signals.
[0124]
As a result, as shown in FIG. 6B, in each of the six speakers, sound is output only from the
speaker unit closest to the position of the listener among the six speaker units constituting the
speaker.
[0125]
Further, the audio reproduction device 1 adjusts the audio output between the six hexahedral
speakers.
That is, the audio reproduction apparatus 1 uses the same method as in the case of controlling
the audio output by the two hexahedral speakers, in the listening position of the user, the
amplitude (that is, the sound pressure) of the waveform of the audio output from each
hexahedral speaker The audio output from the six hexahedron speakers is adjusted so that the
delay amount (that is, the phase difference) from the original signal and the frequency
characteristic become the same.
[0126]
Further, the audio reproduction device 1 according to the present invention is not limited to the
configuration for controlling a hexahedral speaker, and can control various speakers including a
plurality of speaker units, in particular There is no limitation.
[0127]
The configuration of the present invention can also be expressed as follows.
09-05-2019
34
[0128]
Further, in the configuration of the present invention, a plurality of speaker units in which the
radiation direction of sound is changed are incorporated in one housing, and each speaker unit is
driven independently, and sound pressure and frequency characteristics are also controlled
independently. Thus, the sound quality environment optimum for the viewing position is realized.
[0129]
Further, in the configuration of the present invention, a test signal is individually output from
each of the above speaker units, and the amplitude of the signal detected by the sound collection
microphone placed at the viewing position is determined to allow any speaker unit to be a
viewer. To detect the direction of the
[0130]
Further, in the configuration of the present invention, one speaker closest to the viewer is
selected from the positional relationship between the speaker unit and the viewer determined by
the above method.
[0131]
Further, in the configuration of the present invention, when there are two or more "casings
incorporating a plurality of speaker units" adjusted by the above method, test signals are added
again to view the volume balance and delay between the casings. Adjust to be optimal at the
position.
[0132]
The present invention is not limited to the embodiments described above, and various
modifications are possible within the scope of the claims.
That is, an embodiment obtained by combining technical means appropriately modified within
the scope of the claims is also included in the technical scope of the present invention.
[0133]
Finally, each block included in the audio reproduction apparatus, in particular, the delay amount
09-05-2019
35
detection unit 12, the amplitude detection unit 13, and the control unit 15 may be configured by
hardware logic, using a CPU as follows. It may be realized by software.
[0134]
That is, the audio playback device is a CPU (central processing unit) that executes instructions of
a control program that realizes each function, a ROM (read only memory) that stores the
program, a RAM (random access memory) that expands the program, A storage device (recording
medium) such as a memory for storing the program and various data is provided.
Then, an object of the present invention is a recording medium in which a program code (an
executable program, an intermediate code program, a source program) of a control program of
an audio reproduction apparatus which is software that realizes the functions described above is
readably recorded by a computer. This can also be achieved by supplying the above-described
audio reproduction device and the computer (or CPU or MPU) reading out and executing the
program code stored in the recording medium.
[0135]
Examples of the recording medium include tape systems such as magnetic tapes and cassette
tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks
including optical disks such as CD-ROM / MO / MD / DVD / CD-R. A system, a card system such
as an IC card (including a memory card) / optical card, or a semiconductor memory system such
as a mask ROM / EPROM / EEPROM / flash ROM can be used.
[0136]
Further, the audio reproduction device may be configured to be connectable to a communication
network, and the program code may be supplied via the communication network.
The communication network is not particularly limited. For example, the Internet, intranet,
extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone
network, mobile communication network, satellite communication A network etc. are available.
09-05-2019
36
Also, the transmission medium constituting the communication network is not particularly
limited. For example, IEEE1394, USB, power line carrier, cable TV line, telephone line, wired line
such as ADSL line, infrared ray such as IrDA or remote control, Bluetooth ( It is also possible to
use a radio such as a registered trademark), an 802.11 radio, an HDR, a mobile telephone
network, a satellite link, and a terrestrial digital network.
The present invention can also be realized in the form of a computer data signal embedded in a
carrier wave, in which the program code is embodied by electronic transmission.
[0137]
The audio reproducing apparatus according to the present invention can be applied to an audio
reproducing apparatus that performs audio output using a speaker configured by a plurality of
speaker units, and is particularly suitable for an audio reproducing apparatus that outputs audio
using a polyhedral speaker.
[0138]
It is a block diagram showing composition of an audio reproduction device concerning the
present invention.
It is a figure showing the composition of the sound reproduction system concerning the present
invention.
FIG. 7 is a diagram for explaining detection of a speaker unit closest to a listening position in the
present embodiment, and FIG. 7A is a diagram showing a time waveform of a test signal supplied
to each speaker unit configuring the speaker 17; (B) is a figure which shows the time waveform
of the received signal in a microphone.
It is a figure which shows the positional relationship of two speakers and a listener who comprise
the stereo reproduction system shown in FIG.
It is a figure for demonstrating control of the audio ¦ voice output between two speakers in this
Embodiment, (a) is a figure which shows the time waveform of the test signal supplied to two
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speakers, (b) These are figures which show the time waveform of the received signal in the
microphone of the test sound output from two speakers.
It is a figure which shows a mode in the case of reproducing ¦ regenerating an audio ¦ voice by
six hexahedral speakers, and (a) is a figure which shows that the position speaker unit nearest to
a listener's position is selected in one speaker, (B) is a figure which shows that an audio ¦ voice is
output from the speaker unit nearest to a listener's position among six speaker units which
comprise a speaker in each of six speakers.
It is a figure which shows the waveform of the waveform of the original sound reproduced ¦
regenerated in a polyhedral speaker, the waveform in the listening position of the sound output
from each speaker unit, and those synthetic waveforms, and (a) is a figure which shows the
image of the waveform of original sound (B) shows an image of the waveform at the listening
position of the sound output from the front speaker unit, and (c) shows an image of the
waveform at the listening position of the sound output from the side speaker unit (D) is a figure
which shows the image of the waveform in the listening position of the sound output from the
speaker unit on the back, (e) shows the image of the waveform which synthesize ¦ combined the
waveform of (b)-(d) FIG.
Explanation of sign
[0139]
1 audio reproduction device 2 input terminal 3 ADC 4 delay circuit (delay means) 5 frequency
characteristic correction unit (frequency characteristic correction means) 6 gain adjustment unit
(amplitude adjustment means) 7 selection circuit 8 DAC 9 amplifier 10 speaker selection circuit
(selection means 11 test signal generation circuit 12 delay amount detection unit (detection
means) 13 amplitude detection unit (detection means) 14 ADC 15 control unit (detection means)
16 memory 17 speaker 17 'speaker 17a to 17f speaker unit 17'a to f speaker Unit 18
microphone 100 voice reproduction system
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