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DESCRIPTION JP2017092817

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DESCRIPTION JP2017092817
Abstract: Even when an audio signal is converted into a different audio format and reproduced,
the audio signal is reproduced according to the reference acoustic feature quantity. An acoustic
feature amount adjustment device according to the present invention adjusts an acoustic feature
amount of a to-be-adjusted audio signal, which is an audio signal to be adjusted, in accordance
with a reference acoustic feature amount. An analysis unit 11 which extracts an audio feature of
the signal and determines an adjustment value of the audio feature of the audio signal to be
adjusted based on the audio feature as a reference and the audio feature of the audio signal to be
adjusted extracted; And an adjusting unit that adjusts the acoustic feature of the audio signal to
be adjusted according to the adjustment value determined by the unit. [Selected figure] Figure 1
Acoustic feature amount adjustment apparatus and program
[0001]
The present invention relates to an acoustic feature value adjustment apparatus and program for
adjusting an acoustic feature value of a to-be-adjusted audio signal, which is an audio signal to be
adjusted, in accordance with a reference acoustic feature value.
[0002]
Audio formats for broadcasting defined by the ARIB (Association of Radio Industries Business)
standard range from 2 channels stereo, 5.1 channels surround, 22.2 multi-channel audio, etc.
(see Non-Patent Document 1).
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1
Although these audio formats are assumed to be reproduced with the number of channels of the
original audio signal, the number of channels is made different by converting the number of
channels by downmixing or rendering depending on the reproduction environment. It may be
reproduced (see Non-Patent Documents 1 and 2).
[0003]
ARIB STD-B 32 "Video Coding, Audio Coding, and Multiplexing Method in Digital Broadcasting"
Version 3.3 (2015) Sugimoto, S. Oode, and Y. Nakayama, "Downmixing method for 22. 2
multichannel sound signal in 8K Super Hi-Vision broadcasting," Audio Eng. Soc.
Vol.63,No.7/8 pp.590−599(2015)
[0004]
When an audio signal is reproduced with different number of channels by conversion of the
number of channels by downmixing or rendering, the acoustic feature value of the audio signal
such as loudness value or energy changes from the audio signal before conversion, and It
becomes impossible to reproduce according to the acoustic feature quantity of the audio signal
before conversion.
[0005]
An object of the present invention is to solve the problems described above and to reproduce an
audio signal according to the acoustic feature of the audio signal before conversion even when
the audio signal is converted to a different audio format and reproduced. An object of the present
invention is to provide a feature amount adjustment device and program.
[0006]
In order to solve the above problems, an acoustic feature adjustment device according to the
present invention adjusts an acoustic feature amount of a to-be-adjusted audio signal, which is an
audio signal to be adjusted, in accordance with a reference acoustic feature. And extracting an
acoustic feature quantity of the to-be-adjusted audio signal, based on the acoustic feature
quantity serving as the reference and the acoustic feature quantity of the extracted to-beadjusted voice signal; An analysis unit that determines an adjustment value, and an adjustment
unit that adjusts an acoustic feature of the sound signal to be adjusted according to the
adjustment value determined by the analysis unit.
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[0007]
Further, in order to solve the above problem, in the sound feature amount adjustment device
according to the present invention, the analysis unit extracts a sound feature amount of a
reference sound signal which is a sound signal serving as a reference as the sound feature
amount serving as the reference. Is preferred.
[0008]
Further, in order to solve the above problems, in the acoustic feature amount adjustment device
according to the present invention, the analysis unit accumulates the audio signal by a
predetermined amount, and then extracts the acoustic feature amount of the accumulated audio
signal. Is preferred.
[0009]
Moreover, in order to solve the above-mentioned subject, in the acoustic feature quantity
adjustment device according to the present invention, it is preferable that the analysis unit
extract the acoustic feature quantity of the adjusted audio signal after adjustment of the acoustic
feature quantity by the adjustment unit. .
[0010]
Furthermore, in order to solve the above problems, the acoustic feature quantity adjustment
device according to the present invention further includes a delay unit provided in a front stage
of the adjustment unit and delaying the adjusted audio signal for input to the adjustment unit. Is
preferred.
[0011]
Further, in order to solve the above problems, in the acoustic feature quantity adjustment device
according to the present invention, the analysis unit determines the adjustment value at each
predetermined timing, and changes the adjustment value from the previous adjustment value to
the current timing. When updating to the adjustment value determined in step b., It is preferable
to continuously change the adjustment value over a predetermined time from the immediately
preceding adjustment value to the adjustment value determined at the current timing.
[0012]
Further, in order to solve the above problems, in the acoustic feature quantity adjustment device
according to the present invention, the analysis unit determines the adjustment value at each
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predetermined timing, and adjusts the immediately preceding adjustment value and the
adjustment value at this time. It is preferable to determine the adjustment value so that the
difference of is included in a predetermined range.
[0013]
Further, in order to solve the above problems, in the acoustic feature quantity adjustment device
according to the present invention, the analysis unit determines an adjustment value such that
the adjustment value is included in a predetermined range at each predetermined timing. Is
preferred.
[0014]
Further, in order to solve the above problems, in the acoustic feature amount adjustment device
according to the present invention, the analysis unit extracts the acoustic feature amount based
on an audio signal included in the time window while moving the time window. At least one of
the determinations of the adjustment value is performed, and depending on the condition of
adjustment, the time window is moved without overlapping the continuous time windows, or the
continuous time windows partially overlap. It is preferable to appropriately select whether to
move.
[0015]
Moreover, in order to solve the said subject, the program which concerns on this invention
makes a computer function as said acoustic feature-value adjustment apparatus.
[0016]
According to the sound feature adjustment device and program of the present invention, even
when the sound signal is converted into a different sound format and reproduced, the sound
signal can be reproduced according to the reference sound feature.
[0017]
It is a block diagram which shows the structure of the acoustic feature quantity adjustment
apparatus which concerns on the 1st Embodiment of this invention.
It is a block diagram which shows the structure of the analysis part shown in FIG.
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It is a flowchart which shows operation | movement of the acoustic feature-value adjustment
apparatus shown in FIG.
It is a block diagram which shows the structure of the acoustic feature quantity adjustment
apparatus which concerns on the 2nd Embodiment of this invention.
It is a flowchart which shows operation | movement of the acoustic feature-value adjustment
apparatus shown in FIG.
It is a block diagram which shows the structure of the acoustic feature quantity adjustment
apparatus which concerns on the 3rd Embodiment of this invention.
[0018]
Hereinafter, embodiments of the present invention will be described.
[0019]
First Embodiment FIG. 1 is a block diagram showing the configuration of an acoustic feature
quantity adjustment apparatus 10 according to a first embodiment of the present invention.
The present invention is to adjust the acoustic feature of a to-be-adjusted audio signal, which is
an audio signal to be adjusted, in accordance with the acoustic feature of a reference audio signal
which is a reference audio signal.
In the following, a 22.2ch audio signal for 8K SHV (Super Hi-Vision) is used as a reference audio
signal, and a 5.1ch audio signal generated by downmixing the 22.2ch audio signal is a controlled
audio signal. This will be described using an example.
[0020]
The acoustic feature quantity adjustment device 10 illustrated in FIG. 1 includes an analysis unit
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11 and an adjustment unit 12.
[0021]
The analysis unit 11 receives and receives the 22.2 channel audio signal which is a reference
audio signal and the 5.1 channel audio signal which is an adjusted audio signal generated by
downmixing the 22.2 channel audio signal. The acoustic feature of the 22.2ch audio signal and
the acoustic feature of the 5.1ch audio signal are extracted.
[0022]
Specific examples of the acoustic feature quantity of the audio signal extracted by the analysis
unit 11 include various things such as the energy of the audio signal, the loudness value, the
maximum value of the amplitude, and the formant.
The loudness value is an index indicating the loudness of the sound felt by people, and it is based
on the momentary loudness value that is an instantaneous value of 400 ms, the short term
loudness value that is the average value of the loudness values for 3 seconds, and the short term
loudness value. The average loudness value which is an average value in a long period is also
common.
In the present embodiment, the acoustic feature quantities of the audio signal extracted by the
analysis unit 11 include, in addition to these loudness values, instantaneous values of a period
shorter than the short term loudness value (400 ms), and the like.
Such an instantaneous value can also be determined using the same formula as a general
loudness value.
[0023]
The analysis unit 11 determines, based on the acoustic feature quantities of each of the 22.2
channel audio signal and the 5.1 channel audio signal, that the acoustic feature value of the 5.1
channel audio signal, which is a controlled audio signal, is a reference audio signal. The
adjustment value of the acoustic feature of the 5.1ch audio signal that matches the acoustic
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feature of the signal is determined.
Specifically, for example, when extracting the energy of the audio signal as the acoustic feature
amount, the analysis unit 11 calculates the adjustment value according to the difference between
the energy of each of the 22.2 ch audio signal and the 5.1 ch audio signal. Do.
[0024]
The analysis unit 11 outputs the determined adjustment value to the adjustment unit 12.
[0025]
The adjustment unit 12 receives the 5.1ch audio signal which is a controlled audio signal, and
applies the adjustment value output from the analysis unit 11 to the input 5.1ch audio signal
(based on the adjustment value, 5.1ch Adjust the acoustic features of the audio signal).
Then, the adjustment unit 12 outputs the 5.1 ch audio signal after adjustment of the acoustic
feature amount to the outside of the acoustic feature amount adjustment device 10.
[0026]
Next, the configuration of the analysis unit 11 will be described in more detail.
[0027]
FIG. 2 is a block diagram showing the configuration of the analysis unit 11.
[0028]
The analysis unit 11 illustrated in FIG. 2 includes acoustic feature quantity extraction units 111-1
and 111-2, a difference calculation unit 112, and an adjustment value comparison unit 113.
In the following, when the acoustic feature quantity extraction units 111-1 and 111-2 are not
distinguished, they are referred to as an acoustic feature quantity extraction unit 111.
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[0029]
The acoustic feature quantity extraction unit 111-1 receives the 22.2 ch audio signal, extracts the
acoustic feature quantity of the input 22.2 ch audio signal, and outputs the acoustic feature
quantity to the difference calculation unit 112.
[0030]
The acoustic feature quantity extraction unit 111-2 receives the 5.1ch audio signal, extracts the
acoustic feature quantity of the input 5.1ch audio signal, and outputs the acoustic feature
quantity to the difference calculation unit 112.
[0031]
The acoustic feature quantity extraction unit 111 extracts the acoustic feature quantity of the
audio signal after accumulating the input audio signal by a predetermined amount (for a
predetermined period).
Further, the acoustic feature quantity extraction unit 111 extracts the acoustic feature quantity
of the audio signal included in the time window for each time window while moving the
predetermined time window with respect to the accumulated voice signal.
Here, the acoustic feature quantity extraction unit 111 may move the time window such that
successive time windows partially overlap.
By doing this, since the acoustic feature quantity can be obtained as a moving average value, it is
possible to reduce the influence of instantaneous fluctuation of the audio signal.
[0032]
The difference calculating unit 112 calculates the acoustic features of the 22.2 ch audio signal
output from the acoustic feature extracting unit 111-1 and the acoustic features of the 5.1 ch
audio signal output from the acoustic feature extracting unit 111-2. And the calculated difference
an is output to the adjustment value comparison unit 113.
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[0033]
The adjustment value comparison unit 113 determines an adjustment value at each
predetermined timing, and outputs the adjustment value to the adjustment unit 12.
Here, the adjustment value comparison unit 113 compares the adjustment value (preceding
adjustment value b n-1) determined at the previous timing with the difference a n output from
the difference calculation unit 112, and calculates the immediately preceding adjustment value b.
If the difference between n−1 and the difference an is included in a predetermined range, the
difference an is determined as the adjustment value b n at the current timing.
Further, when the difference between the immediately preceding adjustment value b n-1 and the
difference a n is not included in the predetermined range, the adjustment value comparison unit
113 sets the upper limit value or the lower limit value within the predetermined range to the
current value. It is determined as an adjustment value b n at the timing of
By doing this, it is possible to prevent the adjustment value from fluctuating rapidly.
[0034]
Further, when the difference an output from the difference calculation unit 112 is included in a
predetermined range, the adjustment value comparison unit 113 determines the adjustment
value calculated at the current timing as the adjustment value at the current timing. .
Further, when the calculated adjustment value is not included in the predetermined range, the
adjustment value comparison unit 113 can also determine the upper limit value or the lower
limit value within the predetermined range as the adjustment value at the current timing. .
By doing this, it is possible to prevent the adjustment value from fluctuating rapidly.
Furthermore, when the absolute value of the calculated difference an is smaller than a previously
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designated numerical value, the adjustment value may be set to zero.
[0035]
Further, the adjustment value comparison unit 113 determines the adjustment value based on
the acoustic feature amount of the audio signal included in the time window for each time
window while moving the predetermined time window. Here, the adjustment value comparison
unit 113 determines the adjustment value while moving the time window without overlapping
the continuous time windows or moving the continuous time windows so as to partially overlap.
May be By doing this, the adjustment value can be obtained as a moving average value, so that
the influence of instantaneous fluctuation of the audio signal can be reduced.
[0036]
Further, the adjustment value comparison unit 113 determines whether to move the time
window without overlapping the continuous time windows or to move the continuous time
windows so as to partially overlap, according to the condition of the adjustment. It may be
selected appropriately. In addition, as the condition of the condition of adjustment, for example,
there is a time derivative value of the acoustic feature amount. In this case, when the time
derivative value of the acoustic feature amount is smaller than the predetermined value, the
adjustment value comparison unit 113 moves the time window without overlapping the
successive time windows, and the time derivative value of the acoustic feature amount is If it is
larger than the predetermined value, the time windows are moved so that successive time
windows overlap.
[0037]
In addition, when updating the adjustment value, the adjustment value comparison unit 113
continuously changes the adjustment value over a predetermined time from the immediately
previous adjustment value to the adjustment value determined at the current timing. By doing
this, it is possible to prevent the occurrence of sudden fluctuations in the adjustment value. The
adjustment value may be changed linearly or non-linearly.
[0038]
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10
Next, the operation of the acoustic feature quantity adjustment device 10 according to the
present embodiment will be described with reference to the flowchart shown in FIG.
[0039]
When an audio signal (a reference audio signal and an adjusted audio signal) is input (step S101),
the analysis unit 11 starts an analysis.
[0040]
Specifically, the acoustic feature quantity extraction unit 111-1 extracts the acoustic feature
quantity of the reference voice signal, and the acoustic feature quantity extraction unit 111-2
extracts the acoustic feature quantity of the adjusted voice signal (step S102). ).
[0041]
The difference calculating unit 112 calculates the difference between the acoustic feature of the
reference audio signal extracted by the acoustic feature extracting unit 111-1 and the acoustic
feature of the to-be-adjusted audio signal extracted by the acoustic feature extracting unit 111-2.
An is calculated (step S103).
[0042]
The adjustment value comparison unit 113 derives the adjustment value b n at the current
timing from the difference an calculated by the difference calculation unit 112 (step S104).
Specifically, when the difference an is included in a predetermined range, the adjustment value
comparison unit 113 derives the difference an as the adjustment value b n at the current timing,
and the difference an is in a predetermined range. If not included, the upper limit value or the
lower limit value within the predetermined range is derived as the adjustment value b n at the
current timing.
As described above, the adjustment value comparison unit 113 may derive the adjustment value
b n at the present timing by comparing the immediately previous adjustment value b n-1 with the
difference an.
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[0043]
Next, the adjustment value comparison unit 113 determines whether or not the adjustment value
needs to be updated (step S105).
Specifically, if the adjustment value b n derived at the current timing is the same as the
immediately preceding adjustment value b n-1, the adjustment value comparison unit 113
determines that updating of the adjustment value is not necessary, If the adjustment value b n
derived at the current timing is different from the previous adjustment value b n-1, it is
determined that the adjustment value needs to be updated.
[0044]
When it is determined that the adjustment value is not required to be updated (Step S105: No),
the acoustic feature amount adjustment device 10 ends the process.
[0045]
When it is determined that the adjustment value needs to be updated (step S105: Yes), the
adjustment value comparison unit 113 determines the derived adjustment value as the
adjustment value at the current timing (step S106), and the adjustment unit 12 Output to
Based on the adjustment value output from the adjustment value comparison unit 113, the
adjustment unit 12 adjusts the acoustic feature of the sound signal to be adjusted (step S107),
and ends the process.
[0046]
In the present embodiment, an example in which the acoustic feature of the audio signal to be
adjusted is adjusted according to the acoustic feature of the reference audio signal, that is, using
the acoustic feature of the reference audio as a reference. Although explained using, it is not
limited to this.
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For example, the acoustic feature amount of the sound signal to be adjusted may be adjusted as
the acoustic feature amount based on a predetermined acoustic feature amount. In this case,
since the reference acoustic feature amount is directly input to the difference calculation unit 11,
it is not necessary to provide the acoustic feature amount extraction unit 111-1 for extracting the
acoustic feature amount of the reference audio signal.
[0047]
As described above, in the present embodiment, the acoustic feature quantity adjustment device
10 extracts the acoustic feature quantity of the to-be-adjusted audio signal, and based on the
acoustic feature quantity serving as a reference and the acoustic feature quantity of the extracted
to-be-adjusted speech signal. The analysis unit 11 determines an adjustment value of the acoustic
feature of the to-be-adjusted audio signal, and the adjustment unit 12 adjusts the to-be-adjusted
audio signal according to the adjustment value determined by the analysis unit 11.
[0048]
Therefore, since the acoustic feature of the audio signal to be adjusted can be adjusted so that
the acoustic feature of the audio signal to be adjusted matches the acoustic feature as a
reference, the audio signal is converted to a different audio format and reproduced. Also in this
case, the audio signal can be reproduced in accordance with the reference acoustic feature.
[0049]
Second Embodiment FIG. 4 is a block diagram showing a configuration of an acoustic feature
quantity adjustment device 10a according to a second embodiment of the present invention.
In FIG. 4, the same components as in FIG. 1 will be assigned the same reference numerals and
descriptions thereof will be omitted.
[0050]
As compared with the acoustic feature amount adjustment device 10 shown in FIG. 1, the
acoustic feature amount adjustment device 10a shown in FIG. 4 has the adjusted audio signal
(5.1 ch audio signal) after adjustment of the acoustic feature amount by the adjustment unit 12
The point input to the analysis unit 11 is different.
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[0051]
The analysis unit 11 extracts the acoustic feature amounts of the 22.2 ch audio signal which is
the input reference audio signal and the 5.1 ch audio signal after adjustment of the acoustic
feature amount output from the adjustment unit 12.
Then, the analysis unit 11 determines the adjustment value from the acoustic feature amounts of
the 22.2 ch audio signal and the 5.1 ch audio signal.
The method of determining the adjustment value is the same as that of the first embodiment.
[0052]
Next, the operation of the acoustic feature quantity adjustment device 10a according to the
present embodiment will be described with reference to the flowchart shown in FIG. In FIG. 5, the
same processing as that of FIG. 3 is denoted by the same reference numeral, and the description
thereof is omitted.
[0053]
When an audio signal (a reference audio signal and an adjusted audio signal) is input (step S101),
the analysis unit 11 determines whether or not there is an adjustment value b n-1 immediately
before (step S201).
[0054]
When there is no immediately preceding adjustment value b n-1 (step S201: No), the analysis
unit 11 proceeds to the process of step S102.
[0055]
If there is the immediately previous adjustment value b n-1 (step S 201: Yes), the analysis unit 11
outputs the immediately previous adjustment value b n-1 to the adjustment unit 12.
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The adjustment unit 12 applies the adjustment value output from the analysis unit 11 to the
adjusted sound signal (adjusts the acoustic feature of the adjusted sound signal based on the
adjustment value) (step S202).
[0056]
After adjusting the acoustic feature of the audio signal to be adjusted on the basis of the
adjustment value b n-1 immediately before, the analysis unit 11 performs the process of step
S102, that is, the acoustic feature of the reference audio signal by the acoustic feature extraction
unit 111-1. The process proceeds to a process of extracting an amount and a process of
extracting an acoustic feature of the audio signal to be adjusted by the acoustic feature extraction
unit 111-2.
[0057]
As described above, in step S104, the adjustment value comparison unit 113 may derive the
adjustment value b n at the current timing by comparing the previous adjustment value b n-1
with the difference an.
In this case, the adjustment value comparison unit 113 compares the immediately previous
adjustment value b n-1 with the difference an calculated by the difference calculation unit 112.
Then, when the difference between the previous adjustment value b n-1 and the difference an is
included in a predetermined range, the adjustment value comparison unit 113 derives the
difference an as the adjustment value b n at the current timing. If the difference between the
immediately preceding adjustment value b n-1 and the difference an is not included in the
predetermined range, an upper limit value within the predetermined range is derived as the
adjustment value b n at the current timing.
[0058]
As described above, in the present embodiment, the acoustic feature quantity is input to the
analysis unit 11 from the adjusted audio signal after adjustment of the acoustic feature quantity
by the adjustment unit 12.
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[0059]
The adjusted audio signal after adjustment of the acoustic feature amount is input to the analysis
unit 11, so that the analysis unit 11 determines whether or not the adjustment of the acoustic
feature amount of the adjusted audio signal based on the adjustment value is appropriate. While
the adjustment value can be determined.
Therefore, the adjustment accuracy can be enhanced so that the acoustic feature of the adjusted
audio signal matches the acoustic feature of the reference audio signal.
[0060]
Third Embodiment FIG. 6 is a block diagram showing a configuration of an acoustic feature
quantity adjustment device 10b according to a third embodiment of the present invention. In FIG.
6, the same components as in FIG. 1 are denoted by the same reference numerals, and the
description thereof will be omitted.
[0061]
The acoustic feature adjustment device 10b shown in FIG. 6 differs from the acoustic feature
adjustment device 10 shown in FIG. 1 in that a delay unit 13 is added.
[0062]
The delay unit 13 is provided at the front stage of the adjustment unit 12, and receives a 5.1 ch
audio signal which is a controlled audio signal.
Then, the delay unit 13 delays the input 5.1 channel audio signal by a predetermined time, and
outputs the delayed 5.1 channel audio signal to the adjustment unit 12. Here, the time for which
the delay unit 13 delays the sound signal to be adjusted is a time corresponding to a time delay
due to the extraction of the acoustic feature amount by the analysis unit 11 and the
determination of the adjustment value.
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[0063]
As described above, in the present embodiment, the acoustic feature quantity adjustment device
10 b is provided in the previous stage of the adjustment unit 12, delays the input adjusted audio
signal by a predetermined time, and outputs it to the adjustment unit 12. And a delay unit 13.
[0064]
Therefore, the audio signal used to determine the adjustment value can be matched with the
audio signal to be adjusted.
[0065]
In each embodiment described above, the reference audio signal is a 22.2ch audio signal, and the
adjusted audio signal is a 5.1ch audio signal generated by downmixing the 22.2ch audio signal.
Although described using, the present invention is not limited to this.
For example, the present invention is applicable to the case where the reference audio signal is a
5.1ch audio signal and the adjusted audio signal is a 22.2ch audio signal generated by upmixing
the 5.1ch audio signal. is there.
The present invention is also applicable to audio signals of other audio formats than 5.1 ch audio
signal and 22.2 ch audio signal. The present invention is also applicable to the case where the
adjusted audio signal is not an audio signal generated by downmixing or upmixing the reference
audio signal.
[0066]
The method performed by the sound feature amount adjustment apparatus 10, 10a, 10b
according to the present invention may be applied to a program to be executed by a computer. In
addition, the program can be stored in a storage medium, and can be provided to the outside via
a network.
[0067]
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Although the present invention has been described based on the drawings and embodiments, it
should be noted that those skilled in the art can easily make various changes or modifications
based on the present disclosure. Therefore, it should be noted that these variations or
modifications are included in the scope of the present invention. For example, functions included
in each block or step can be rearranged so as not to be logically inconsistent, and a plurality of
blocks or steps can be combined or divided into one.
[0068]
10, 10a, 10b Acoustic feature adjustment device 11 Analysis unit 12 Adjustment unit 13 Delay
unit 111-1, 111-2 Acoustic feature extraction unit 112 Difference calculation unit 113
Adjustment value comparison unit
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