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JP2017200025

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DESCRIPTION JP2017200025
Abstract: The present invention provides an acoustic signal compensation device that improves
the quality of actual reproduced sound. An acoustic signal compensation device generates a
simulated reproduced sound signal by convoluting an acoustic signal with a transfer function and
a first frequency analysis unit that performs frequency analysis processing on an actual
reproduced sound signal input from a microphone. Simulated reproduction sound signal
generating means 30, second frequency analysis means 40 for performing frequency analysis
processing on the simulated reproduction sound signal input from the simulated reproduction
sound signal generation means 30, and frequencies of the actual reproduction sound signal and
the simulated reproduction sound signal Noise frequency band detection means 50 for detecting
a noise frequency band by comparing analysis results, a speaker selection means 70 for selecting
one compensated speaker among a plurality of speakers S, and an acoustic signal corresponding
to the compensated speaker Acoustic signal compensation means 80 for compensating the noise
frequency band of [Selected figure] Figure 2
Acoustic signal compensation device and program thereof
[0001]
The present invention relates to an acoustic signal compensation apparatus that compensates for
noise when a plurality of speakers reproduce an acoustic signal in a noise environment, and a
program thereof.
[0002]
07-05-2019
1
In public viewing and exhibition halls, due to background noise of the environment and noise
generated by people coming and going, the sound signal to be reproduced may be difficult to
hear or the sound quality may be deteriorated.
Then, the invention which compensates the acoustic signal buried in noise conventionally is
proposed (for example, patent document 1). The invention described in Patent Document 1
controls the loudness of an acoustic signal in a noisy environment to be equal to the loudness of
an acoustic signal in a noiseless environment.
[0003]
Patent 3505085 (Japanese Patent Application Laid-Open No. 11-298990)
[0004]
However, in the above-described prior art, when reproducing the sound signal with multiple
channels, the sound signals of all the channels are uniformly compensated (adjusted), so the
effect of noise is different for each listening point. In some cases there may be excess or
deficiency.
As a result, there is a problem that the quality of the actually reproduced sound is lowered, for
example, the actually reproduced sound becomes too loud and the actually reproduced sound is
heard with a sound different from the initial assumption.
[0005]
An object of the present invention is to provide an acoustic signal compensation device that
improves the quality of actually reproduced sound, and a program thereof.
[0006]
In view of the above problems, an acoustic signal compensation device according to the present
invention is an acoustic signal compensation device that compensates for noise when a plurality
of speakers reproduce an acoustic signal under a noise environment, and the first frequency
analysis means , Simulated reproduced sound signal generation means, second frequency
analysis means, noise frequency band detection means, speaker selection means, and acoustic
signal compensation means.
07-05-2019
2
[0007]
According to this configuration, the acoustic signal compensation device receives the actually
reproduced sound input by inputting the actually reproduced sound signal in which the sound
signals reproduced by the plurality of speakers are picked up by the microphone at the
predetermined position by the first frequency analysis means. Perform frequency analysis on the
signal.
The acoustic signal compensation device is a simulated reproduced sound signal that is an
acoustic signal reproduced by the plurality of speakers in a noiseless environment by convoluting
the acoustic signal into transfer functions from the plurality of speakers to the microphone by
the simulated reproduced sound signal generation unit. Generate
[0008]
The acoustic signal compensation device performs frequency analysis processing on the
simulated reproduction sound signal by the second frequency analysis means.
The acoustic signal compensation device compares the frequency analysis result of the real
reproduction sound signal and that of the simulated reproduction sound signal by the noise
frequency band detection means so that the noise frequency band which is a frequency band in
which the real reproduction sound signal is buried in noise. To detect.
[0009]
The acoustic signal compensation apparatus selects one speaker as a target of noise
compensation from among a plurality of speakers as a speaker to be compensated by the speaker
selection means. The acoustic signal compensation device compensates the noise frequency band
of the acoustic signal corresponding to the compensated speaker by the acoustic signal
compensation means.
07-05-2019
3
[0010]
As described above, since the acoustic signal compensation apparatus selects one compensated
speaker and compensates the noise frequency band of the acoustic signal output from the
selected compensated speaker, the acoustic signals of all channels are uniformly compensated. In
comparison with the above, it is less likely to cause over- or under-compensation.
[0011]
The present invention can also be realized by an acoustic signal compensation program that
causes hardware resources of a computer, such as a CPU, a memory, and a hard disk, to
cooperate as an acoustic signal compensation device.
[0012]
According to the present invention, the following excellent effects can be obtained.
Since the acoustic signal compensation device according to the present invention is less likely to
cause overcompensation or undercompensation, it is possible to prevent the situation where the
actual reproduced sound becomes too large or that the actual reproduced sound is heard with a
different sound than originally expected Sound quality can be improved.
[0013]
It is a schematic block diagram of the sound system concerning a 1st embodiment.
It is a block diagram which shows the structure of the acoustic signal compensation apparatus of
FIG. In 1st Embodiment, it is the graph which showed the relationship of the sound pressure level
of noise and a simulation reproduction | regeneration sound signal for every frequency band, (a)
is an example when performing compensation, (b) is not compensated. An example of the time It
is a flowchart which shows operation | movement of the acoustic signal compensation apparatus
of FIG. It is a schematic block diagram of the sound system concerning a 2nd embodiment. It is a
block diagram which shows the structure of the acoustic signal compensation apparatus of FIG.
[0014]
07-05-2019
4
Hereinafter, each embodiment will be described in detail with reference to the drawings as
appropriate. In each embodiment, means having the same function are denoted by the same
reference numeral, and the description thereof is omitted.
[0015]
First Embodiment [Arrangement of Acoustic System] The arrangement of an acoustic system 1
according to the first embodiment will be described with reference to FIG. The sound system 1
reproduces a multi-channel sound signal under a noise environment. At this time, the sound
system 1 reproduces the actual reproduction sound with the optimum sound quality (quality) at
the listening point 91 preset in the listening space 90.
[0016]
The listening space 90 is a space where the listener 9 listens to the acoustic signal, that is, a
space where the acoustic signal is reproduced. In the present embodiment, the listening space 90
is an indoor space. The listening point 91 is a position in the listening space 90 at which the
acoustic signal is to be listened. Usually, the listening point 91 is at the same position as the head
of the listener 9. The noise environment is an environment in which noise is generated regardless
of the cause and type of noise. In the present embodiment, the listening space 90 is said to be
under a noise environment because noise is generated by the listener 9. A noiseless environment
is one in which no noise occurs. The actual reproduction sound is a sound when the sound signal
is actually reproduced in the listening space 90. That is, the actual reproduction sound is affected
by the same noise as the listener 9. The acoustic signal is a signal obtained by collecting a
desired sound (for example, the sound of a broadcast program). Of course, the acoustic signal is
not affected by noise.
[0017]
As shown in FIG. 1, the acoustic system 1 includes a plurality of speakers S, one microphone M,
and an acoustic signal compensation device 10. In the present embodiment, the sound system 1
is provided with ten speakers S. In FIG. 1, in order to make the drawing easy to see, only a part of
the signal output from the acoustic signal compensation device 10 to the speaker is shown, and
07-05-2019
5
some reference numerals are omitted.
[0018]
The speaker S is a general speaker that reproduces an acoustic signal input from the acoustic
signal compensation device 10. The speaker S can be disposed at any place in the listening space
90. Each speaker S is assigned identification information (for example, a channel number) that
can uniquely identify the speaker S.
[0019]
The microphone M is a general microphone that picks up the sound reproduced by the speaker S.
The microphone M is preferably disposed near the listening point 91 because the sound picked
up by the microphone M is treated as an actual reproduction sound to be a judgment reference
of noise.
[0020]
The acoustic signal compensation device 10 compensates for noise when a plurality of speakers
S reproduce an acoustic signal in the listening space 90. In the present embodiment, the acoustic
signal compensation device 10 receives an actual reproduced sound signal from the microphone
M and outputs an acoustic signal subjected to noise compensation to each speaker S.
[0021]
[Configuration of Acoustic Signal Compensation Device] The configuration of the acoustic signal
compensation device 10 will be described with reference to FIG. As shown in FIG. 2, the acoustic
signal compensation device 10 includes a first frequency analysis unit 20, a simulated
reproduction sound signal generation unit 30, a second frequency analysis unit 40, a noise
frequency band detection unit 50, and position information storage. A means 60, a speaker
selection means 70, and an acoustic signal compensation means 80 are provided.
07-05-2019
6
[0022]
The first frequency analysis means 20 receives an actual reproduction sound signal from the
microphone M, and performs a frequency analysis process on the input real reproduction sound
signal. The actual reproduction sound signal is a signal obtained by collecting the sound signal
reproduced by the plurality of speakers S by the microphone M. In the present embodiment, the
first frequency analysis unit 20 performs octave band analysis processing (for example, 1/3
octave band analysis processing) as a frequency analysis processing on the actually reproduced
sound signal. Then, the first frequency analysis means 20 outputs the result of frequency
analysis of the real reproduction sound signal (sound pressure level of the real reproduction
sound signal for each frequency band) to the noise frequency band detection means 50.
[0023]
The simulated reproduction sound signal generation unit 30 generates a simulated reproduction
sound signal by convoluting an acoustic signal into a transfer function from the plurality of
speakers S to the microphone M. The simulated reproduction sound signal is an acoustic signal
reproduced by a plurality of speakers in a noiseless environment. In this embodiment, ten
transfer functions from each speaker S to the microphone M are measured in advance. Further,
the simulated reproduction sound signal generation means 30 receives an acoustic signal
reproduced by each speaker S, that is, an acoustic signal of 10 channels. Then, the simulated
reproduction sound signal generation unit 30 generates a simulated reproduction sound signal
by convoluting the transfer function corresponding to the speaker S and the acoustic signal for
each speaker S. Thereafter, the simulated reproduction sound signal generation means 30
outputs the generated simulated reproduction sound signal to the second frequency analysis
means 40.
[0024]
The second frequency analysis means 40 performs frequency analysis processing on the
simulated reproduction sound signal input from the simulated reproduction sound signal
generation means 30. Here, the second frequency analysis means 40 performs the same
frequency analysis processing as the first frequency analysis means 20 on the simulated
reproduction sound signal. Then, the second frequency analysis means 40 outputs the result of
frequency analysis of the simulated reproduction sound signal (sound pressure level of the
simulation reproduction sound signal for each frequency band) to the noise frequency band
07-05-2019
7
detection means 50.
[0025]
The noise frequency band detection means 50 compares the frequency analysis result of the real
reproduction sound signal inputted from the first frequency analysis means 20 with the
frequency analysis result of the simulated reproduction sound signal inputted from the second
frequency analysis means 40. It is a thing. Then, the noise frequency band detection means 50
detects, from the comparison result, a noise frequency band which is a frequency band in which
the actual reproduced sound signal is buried in the noise.
[0026]
Here, assuming that the simulated reproduction sound is a reference and the actual reproduction
sound is a comparison sound, the sound pressure level of the actual reproduction sound becomes
higher than the sound pressure level of the simulated reproduction sound when the actual
reproduction sound contains noise. . Therefore, a band in which both sound pressure levels are
the same and a band in which the sound pressure level of the actual reproduction sound is higher
than the sound pressure level of the simulated reproduction sound appear.
[0027]
Therefore, the noise frequency band detection means 50 compares the sound pressure levels
(frequency analysis results) of the actual reproduction sound signal and the simulated
reproduction sound signal, and the sound pressure level of the actual reproduction sound signal
is higher than that of the simulated reproduction sound. A band which becomes high is detected
as a noise frequency band. Furthermore, the noise frequency band detection means 50 calculates,
for the detected noise frequency band, the sound pressure level difference between the actual
reproduction sound signal and the simulated reproduction sound as the sound pressure level of
noise. Thereafter, the noise frequency band detection means 50 outputs the detected noise
frequency band, the sound pressure level of the simulated reproduction sound signal, and the
calculated sound pressure level of noise to the speaker selection means 70.
[0028]
07-05-2019
8
The position information storage means 60 is a memory for storing in advance position
information of the speaker S and the microphone M, and a storage device such as an HDD (Hard
Disk Drive). This position information is information representing where each speaker S and
microphone M are located in the listening space 90.
[0029]
The speaker selection means 70 selects one speaker S to be subjected to noise compensation
from among the plurality of speakers S as a compensated speaker. In the present embodiment,
the speaker selection means 70 selects one speaker S closest to the speaker S or the microphone
with the largest sound pressure level in the noise frequency band. Then, the speaker selection
means 70 includes acoustic signal compensation means for identification information of the
compensated speaker, the noise frequency band inputted from the noise frequency band
detection means 50, the sound pressure level of the simulated reproduction sound signal, and the
sound pressure level of the noise. Output to 80.
[0030]
That is, in the present embodiment, in order not to lose the balance of the sound reproduced by
each speaker S, the minimum compensation is performed only on the acoustic signal assigned to
the compensated speaker. Hereinafter, two specific examples of the method for selecting a
speaker will be described.
[0031]
<Method of Selecting Speakers: First Example> The method of the first example is to select one
speaker S having the largest sound pressure level in the noise frequency band at the listening
point 91. Specifically, for each of the speakers S, the speaker selection means 70 obtains the
sound pressure level of the simulated reproduction sound signal in the noise frequency band
input from the noise frequency band detection means 50. And the speaker selection means 70
selects the speaker S with the largest sound pressure level of the noise frequency band calculated
| required as a to-be-compensated speaker.
07-05-2019
9
[0032]
The speaker S with the largest sound pressure level in the noise frequency band can be said to be
the speaker with the largest contribution of the acoustic signal at the listening point 91.
Therefore, the acoustic signal compensation device 10 can perform compensation at the listening
point 91 with the minimum compensation amount by using only the speaker S as a compensated
speaker.
[0033]
<Method of Selecting Speaker: Second Example> The method of the second example is to select
one speaker S closest to the microphone M. Specifically, the speaker selection means 70 refers to
the position information stored in the position information storage means 60, and selects the
speaker S closest to the microphone M as a compensated speaker.
[0034]
The speaker selection means 70 sets in advance which of the methods of the first and second
examples is to be used. When the method of the second example is not used, the position
information storage unit 60 may not be provided.
[0035]
The acoustic signal compensation unit 80 compensates for the noise frequency band of the
acoustic signal corresponding to the compensated speaker by referring to the identification
information of the compensated speaker input from the speaker selection unit 70.
[0036]
Here, the acoustic signal compensation means 80 receives the noise frequency band, the sound
pressure level of the simulated reproduction sound signal, and the sound pressure level of noise
from the speaker selection means 70, and receives the acoustic signal.
07-05-2019
10
Then, the acoustic signal compensation means 80 compensates the noise frequency band of the
acoustic signal within a preset range (for example, within +6 dB) such that the sound pressure
level of the simulated reproduction sound signal is higher than the sound pressure level of noise.
Do.
[0037]
As described above, the band where the sound pressure level of noise exceeds the sound
pressure level of the simulated reproduction sound signal (frequency band f) is a band in which
the noise is larger than the simulated reproduction sound, and the simulated reproduction sound
is buried in the noise There is. Therefore, it is sufficient to compensate the sound pressure level
in the frequency band f.
[0038]
As shown in FIG. 3A, consider the case where the difference Δ of the sound pressure level
between the simulated reproduction sound signal and the noise is within the set range. In this
case, the acoustic signal compensation means 80 brings the sound pressure level of the acoustic
signal closer to the sound pressure level of noise with the set range as the upper limit. Then, the
acoustic signal compensation unit 80 outputs the acoustic signal after compensation to the
speaker S selected as the compensated speaker.
[0039]
Here, in FIG. 3A, the vertical axis is the sound pressure level of the simulated reproduction sound
signal, and the horizontal axis is the frequency of the simulated reproduction sound signal. Also,
the sound pressure level of noise is illustrated by a broken line, and the noise frequency band is
illustrated by a symbol f. Further, the difference in sound pressure level between the simulated
reproduction sound signal and the noise in the noise frequency band f is illustrated by a symbol
Δ.
[0040]
07-05-2019
11
On the other hand, as shown in FIG. 3B, a case is considered where the difference Δ between the
simulated sound signal and the sound pressure level of the noise exceeds the set range. In this
case, if the sound pressure level of the simulated reproduction sound signal is brought close to
the sound pressure level of noise, the sound pressure level of the acoustic signal becomes too
high. For this reason, the acoustic signal compensating means 80 outputs the acoustic signal as it
is to the speaker S selected as the compensated speaker without performing the compensation of
the acoustic signal. The acoustic signal compensating means 80 outputs the acoustic signal as it
is to the speakers S other than the compensated speaker.
[0041]
[Operation of Acoustic Signal Compensation Device] The operation of the acoustic signal
compensation device 10 will be described with reference to FIG. 4 (see FIG. 2 as needed). As
shown in FIG. 4, in the acoustic signal compensation device 10, the first frequency analysis
means 20 performs a frequency analysis process on the actual reproduction sound signal
inputted from the microphone M (step S1). The acoustic signal compensation device 10
generates a simulated reproduced sound signal by convoluting the acoustic signal into transfer
functions from the plurality of speakers S to the microphones M by the simulated reproduced
sound signal generation unit 30 (step S2).
[0042]
The acoustic signal compensation device 10 performs frequency analysis processing on the
simulated reproduction sound signal generated by the simulated reproduction sound signal
generation unit 30 by the second frequency analysis unit 40 (step S3). The acoustic signal
compensation device 10 detects the noise frequency band by comparing the result of frequency
analysis of the actual reproduction sound signal and the simulated reproduction sound signal by
the noise frequency band detection means 50 (step S4).
[0043]
The acoustic signal compensation device 10 selects one speaker S to be a target of noise
compensation from among the plurality of speakers S as a speaker to be compensated by the
speaker selection means 70. For example, the speaker selection means 70 selects one speaker S
07-05-2019
12
of a channel for which the sound pressure level in the noise frequency band is maximum. The
speaker selection means 70 may select one speaker S closest to the microphone M (step S5).
[0044]
The acoustic signal compensation device 10 compensates the noise frequency band of the
acoustic signal corresponding to the compensated speaker selected by the loudspeaker selection
unit 70 by the acoustic signal compensating unit 80 (step S6).
[0045]
As described above, the acoustic signal compensation device 10 according to the present
embodiment selects one speaker S as the compensated speaker, and compensates only the
acoustic signal corresponding to the speaker S, so that the compensation excess or deficiency
occurs. It becomes difficult.
As a result, the sound signal compensation device 10 can prevent the situation where the actual
reproduction sound becomes too large or the actual reproduction sound may be heard with a
sound different from the initial assumption, and can improve the quality of the actual
reproduction sound. As a result, the acoustic system 1 can perform multi-channel reproduction
with the same quality in the listening space 90 even in a noise environment as when there is no
noise.
[0046]
Second Embodiment [Configuration of Audio System] The configuration of an audio system 1B
according to the second embodiment will be described with reference to FIG. 5 as to differences
from the first embodiment. In the first embodiment, the sound system 1 has been described as
including one microphone M. The second embodiment is different from the first embodiment in
that the acoustic system 1B includes a plurality of microphones M.
[0047]
As shown in FIG. 5, the acoustic system 1B includes a plurality of speakers S, a plurality of
07-05-2019
13
microphones M, and an acoustic signal compensation device 10B. In the present embodiment,
the acoustic system 1B includes four microphones M.
[0048]
[Configuration of Acoustic Signal Compensation Device] The configuration of the acoustic signal
compensation device 10B will be described with reference to FIG. The acoustic signal
compensation device 10 </ b> B performs the same processing as the acoustic signal
compensation device 10 of FIG. 2 for each microphone M. That is, the acoustic signal
compensation device 10B compensates the acoustic signal for up to four speakers. As shown in
FIG. 6, the acoustic signal compensation device 10B includes a first frequency analysis unit 20B,
a simulated reproduction sound signal generation unit 30B, a second frequency analysis unit
40B, a noise frequency band detection unit 50B, and position information storage. A means 60, a
speaker selection means 70B, and an acoustic signal compensation means 80B.
[0049]
The first frequency analysis means 20B receives the actual reproduction sound signal picked up
by each microphone M and performs frequency analysis processing on the inputted real
reproduction sound signal for each microphone M as in the first embodiment. It is. Then, for each
microphone M, the first frequency analysis means 20B outputs the frequency analysis result of
the actual reproduction sound signal to the noise frequency band detection means 50B.
[0050]
The simulated reproduction sound signal generation unit 30B generates a simulated
reproduction sound signal by convoluting an acoustic signal into transfer functions from the
plurality of speakers S to the microphones M. In this embodiment, it is assumed that ten transfer
functions (40 in total) are measured in advance for each microphone M from each speaker S to
each microphone M. Further, the simulated reproduction sound signal generation means 30B
receives the sound signal reproduced by each speaker S, that is, the sound signal of 10 channels.
Then, the simulated reproduction sound signal generation unit 30B generates a simulated
reproduction sound signal by convolving the transfer function corresponding to each speaker S
with the acoustic signal for each microphone M. Thereafter, the simulated reproduction sound
signal generation means 30B outputs the generated simulated reproduction sound signal to the
07-05-2019
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second frequency analysis means 40B.
[0051]
The second frequency analysis means 40B performs frequency analysis processing on the
simulated reproduction sound signal input from the simulated reproduction sound signal
generation means 30B. Here, the second frequency analysis means 40B performs the same
frequency analysis processing as that of the first frequency analysis means 20B on the simulated
reproduction sound signal. Then, for each microphone M, the second frequency analysis means
40B outputs the frequency analysis result of the simulated reproduction sound signal to the
noise frequency band detection means 50B.
[0052]
The noise frequency band detection means 50B performs, for each microphone M, the frequency
analysis result of the actual reproduction sound signal inputted from the first frequency analysis
means 20B and the frequency analysis of the simulated reproduction sound signal inputted from
the second frequency analysis means 40B. It compares the results. Then, the noise frequency
band detection means 50B detects, for each microphone M, from the comparison result, a noise
frequency band which is a frequency band in which the actual reproduced sound signal is buried
in the noise. Further, the noise frequency band detection means 50B calculates, for each of the
microphones M, the sound pressure level difference between the actual reproduction sound
signal and the simulated reproduction sound as the sound pressure level of noise for the detected
noise frequency band. After that, the noise frequency band detection means 50B detects, for each
microphone M, the detected noise frequency band, the sound pressure level of the simulated
reproduction sound signal, the sound pressure level of the real reproduction sound signal, and
the sound pressure level of the calculated noise. Are outputted to the speaker selection means
70B.
[0053]
The speaker selection means 70B is for selecting one speaker S to be subjected to noise
compensation among the plurality of speakers S as a compensated speaker. Here, the speaker
selection unit 70B selects a compensated speaker for each microphone M. Then, the speaker
selection means 70B detects the identification information of the compensated speaker, the noise
07-05-2019
15
frequency band input from the noise frequency band detection means 50B, the sound pressure
level of the simulated reproduction sound signal, the sound pressure level of the real
reproduction sound signal, and the noise. The sound pressure level is output to the acoustic
signal compensation means 80B. In addition, since the speaker selection means 70B can select
the speaker S by the method similar to 1st Embodiment, the description beyond this is abbreviate
| omitted.
[0054]
The acoustic signal compensation unit 80B compensates for the noise frequency band of the
acoustic signal corresponding to the compensated speaker by referring to the identification
information of the compensated speaker input from the speaker selection unit 70B.
[0055]
Here, the sound signal compensation means 80B receives the noise frequency band, the sound
pressure level of the simulated reproduction sound signal, the sound pressure level of the real
reproduction sound signal, and the sound pressure level of the noise for each microphone M
from the speaker selection means 70B. , An acoustic signal is input.
Further, the acoustic signal compensation unit 80B obtains, for each microphone M, the
difference in sound pressure level between the actual reproduction sound signal and the noise in
the noise frequency band. The acoustic signal compensation means 80B compensates for the
sound pressure level of the noise frequency band of the simulated reproduction sound signal to
be maximum at the microphones M other than the compensated speaker at the microphone M
where the difference between the sound pressure levels obtained is the largest. Select the
reference speaker. Further, the acoustic signal compensating means 80B compensates the noise
frequency band of the acoustic signal corresponding to the compensated speaker with the noise
frequency band component of the acoustic signal corresponding to the compensation reference
speaker.
[0056]
That is, from the acoustic signal allocated to the speaker S different from the compensated
speaker, the acoustic signal compensating means 80B extracts only the frequency component
necessary for compensation, and superimposes it on the acoustic signal allocated to the
07-05-2019
16
compensated speaker. As described above, the acoustic signal compensation unit 80B assigns the
acoustic signal allocated to the compensation reference speaker with a large contribution of the
acoustic signal at the listening point 91 to the speakers S other than the compensation reference
speaker, thereby affecting the entire listening area. It can be made as small as possible and
compensation can be performed at the listening point 91.
[0057]
Thereafter, the acoustic signal compensation unit 80B outputs the acoustic signal after
compensation to the speaker S selected as the compensated speaker. The acoustic signal
compensation unit 80B outputs the acoustic signal as it is to the speakers S other than the
compensated speaker. Moreover, since the operation of the acoustic signal compensation device
10B is the same as that of the first embodiment, the description thereof is omitted.
[0058]
As described above, the acoustic signal compensation device 10B according to the present
embodiment detects the noise frequency band at a plurality of listening points and performs
noise compensation at a plurality of listening points. Sound quality can be improved.
[0059]
As mentioned above, although each embodiment of the present invention has been described in
detail, the present invention is not limited to the above-described embodiment, and design
changes and the like within the scope of the present invention are also included.
For example, the acoustic signal compensation device may select the speaker most affected by
noise as the compensated speaker.
[0060]
Although the acoustic signal compensation device has been described as an independent
hardware in the above embodiment, the present invention is not limited to this. For example, the
present invention can also be realized by an acoustic signal compensation program that causes
07-05-2019
17
hardware resources of a computer such as a CPU, a memory, a hard disk and the like to
cooperate as an acoustic signal compensation device. This program may be distributed via a
communication line, or may be distributed by writing on a recording medium such as a CD-ROM
or a flash memory.
[0061]
1, 1B acoustic system 10, 10B acoustic signal compensation device 20, 20B first frequency
analysis means 30, 30B simulated reproduction sound signal generation means 40, 40B second
frequency analysis means 50, 50B noise frequency band detection means 60 position
information storage means 70, 70B Speaker selection means 80, 80B Acoustic signal
compensation means S Speaker M Microphone
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