JP2015041803

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DESCRIPTION JP2015041803
The present invention provides an audio reproduction device and an audio reproduction method
capable of suppressing a chattering phenomenon and suppressing deterioration in sound quality.
SOLUTION: From a speaker 20 for emitting a sound by using a first sound signal and an inherent
vibration frequency of a housing 30 to which the speaker 20 is attached among frequency
components included in an input second sound signal The level at the time of sound output of
the required first frequency band is suppressed below the first level, and the level at the time of
sound output of the second frequency band adjacent to the first frequency band is suppressed
below the second level, And a signal control unit 12 that generates a first audio signal. [Selected
figure] Figure 5
Voice reproduction apparatus and voice reproduction method
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an
audio reproduction apparatus that outputs sound and an audio reproduction method executed by
the audio reproduction apparatus.
[0002]
In an audio reproduction apparatus provided with a housing to which a speaker is attached, a socalled chattering phenomenon may occur in which the housing resonates by the sound output
from the speaker.
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The chattering phenomenon is caused by, for example, sound of a specific frequency band
(hereinafter, referred to as resonance frequency band ) which causes resonance in the case
among sounds output from the speaker.
[0003]
When a chattering phenomenon occurs, there may be cases such as vibration (chatter) of the
case due to sound in the resonance frequency band and abnormal noise or distortion of sound
caused by sound in the human audio frequency band of the resonance frequency band. There is a
problem of being there. In particular, when a voice with a large volume in the resonance
frequency band is output from the speaker, the chattering phenomenon becomes more
remarkable, which may deteriorate the sound quality.
[0004]
As a configuration for suppressing such a chattering phenomenon, for example, a sound
reproduction device that suppresses the occurrence of the chattering phenomenon by detecting a
frequency band in which the chattering phenomenon occurs and attenuating the level of sound
pressure in the detected frequency band. Are disclosed (see, for example, Patent Document 1).
[0005]
JP, 2011-79389, A
[0006]
However, in the audio reproduction apparatus described in Patent Document 1, there is a
problem that the sound quality may be deteriorated because the volume of the frequency band in
which the chattering phenomenon occurs is attenuated.
[0007]
The present invention has been made to solve the above-described problems, and it is an object
of the present invention to provide an audio reproduction device and an audio reproduction
method capable of suppressing a chattering phenomenon and suppressing deterioration in sound
quality. Do.
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[0008]
In order to achieve the above object, an audio reproduction apparatus according to an aspect of
the present invention includes a speaker for emitting an audio using a first audio signal, and a
frequency component included in an input second audio signal, The level at the time of sound
output of the first frequency band determined from the inherent vibration frequency of the
housing to which the speaker is attached is suppressed to the first level or lower, and further, in
the second frequency band adjacent to the first frequency band. And a signal control unit that
generates the first audio signal by suppressing the level at the time of sound output to a second
level or less.
[0009]
In the audio reproducing apparatus having the above configuration, not only the first frequency
band in which the chattering phenomenon occurs but also the level (amplitude) of the second
frequency band adjacent to the first frequency band is adjusted, so that the deterioration of the
sound quality is suppressed. Becomes possible.
[0010]
For example, the signal control unit divides the voice into a plurality of frequency bands having
the same bandwidth, identifies a part of the plurality of frequency bands as the second frequency
band, and for each of the second frequency bands, The upper limit value of the amplitude may be
set as the second level so as to maintain the magnitude relationship between the amplitude of the
frequency band adjacent to the second frequency band and the second frequency band.
[0011]
In the audio reproducing apparatus having the above configuration, the level of the second
frequency band is adjusted so as to maintain the magnitude relationship between the amplitude
of the second frequency band and the frequency band adjacent to the second frequency band. It
becomes possible to suppress appropriately.
[0012]
In addition, the signal control unit includes a plurality of units for each of the plurality of
frequency bands, and each of the plurality of units is a band pass filter that passes one frequency
band of the plurality of frequency bands; The upper limit value of the amplitude corresponding
to one frequency band may be used to have a limiter for limiting the amplitude of the signal
output from the band pass filter.
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[0013]
In the audio reproduction apparatus of the above configuration, the reduction in sound quality
can be suppressed with a simple configuration.
[0014]
Further, the signal control unit obtains the amplitude of the audio signal for each of the plurality
of frequency bands, derives an envelope formed by the amplitude for each of the plurality of
frequency bands, and determines maximum values and minimum values of the envelope. The
upper limits of the amplitudes of the second frequency band and the second frequency band may
be set so as not to change the position and the number.
[0015]
In the sound reproducing apparatus of the above configuration, the level of the second frequency
region is adjusted so as not to change the position and number of the maximum value and the
minimum value of the envelope, so that the sound quality deterioration can be suppressed more
appropriately. become.
[0016]
Further, the signal control unit may set a frequency band other than the first frequency band
between frequency bands taking two minimal values surrounding the first frequency band
among frequency bands taking minimal values in the envelope. The second frequency band may
be set.
[0017]
In the sound reproducing apparatus having the above configuration, of the frequency bands
which take the local minimum value in the envelope, two frequency bands surrounding the first
frequency band, and a frequency band other than the first frequency band between the two
frequency bands Is set as the second frequency band, so that the second frequency band can be
set in an appropriate range.
It becomes possible to make the range which adjusts a level into a small range.
[0018]
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The present invention can not only be realized as an audio reproduction apparatus provided with
such a characteristic processing unit, but also an audio reproduction method having a process
executed by a characteristic processing unit included in the audio reproduction apparatus as a
step. Can be realized as
In addition, a program for causing a computer to function as a characteristic processing unit
included in an audio reproduction apparatus or a program for causing a computer to execute
characteristic steps included in an audio reproduction method can also be realized.
It goes without saying that such a program can be distributed via a computer readable nontemporary recording medium such as a CD-ROM (Compact Disc-Read Only Memory) or a
communication network such as the Internet. .
[0019]
According to the present invention, it is possible to provide an audio reproduction device and an
audio reproduction method capable of suppressing a chattering phenomenon and suppressing
deterioration in sound quality.
[0020]
It is a block diagram showing an example of an audio reproduction device.
FIG. 1 is a block diagram showing a configuration of an audio reproduction unit of a first
embodiment.
5 is a flowchart showing an operation of the audio reproduction unit of the first embodiment.
It is a graph which shows an example of the amplitude according to frequency band of the 2nd
audio signal.
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5 is a graph showing an example of the amplitude of each of the first audio signals according to
the first embodiment for each frequency band.
It is a graph which shows an example of the amplitude according to the frequency band of the
conventional 1st audio signal.
FIG. 8 is a block diagram showing a configuration of an audio reproduction unit of a second
embodiment.
15 is a flowchart showing an operation of the audio reproduction unit of the third embodiment.
[0021]
<Details of Problem> As described above, in the audio reproduction apparatus, a chattering
phenomenon may occur.
[0022]
When vibrations occur in the case in the audible frequency band of a person due to the
chattering phenomenon, abnormal noise may be generated and distortion of sound may occur.
In addition, when vibration occurs in the housing due to the chattering phenomenon, there is a
possibility that a member disposed in the vicinity of the housing and the housing intermittently
contact to generate a tapping noise.
In particular, in the case of reproducing a sound at a large volume, for example, when a music
source close to 0 dBfs is reproduced at a large volume close to the rating of the speaker, the
vibration of the case becomes large and problems such as generation of abnormal noise become
more noticeable It is considered to be
[0023]
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Here, as described above, the chattering phenomenon occurs due to the vibration of the housing.
Therefore, it is considered that the chattering phenomenon can be suppressed by increasing the
strength of the housing to which the speaker is attached.
[0024]
However, in recent years, for example, products such as TVs have been required to be thinner
and lighter.
Therefore, a technique for suppressing the chattering phenomenon without increasing the
strength of the housing is desired.
[0025]
As a configuration that suppresses the chattering phenomenon while responding to the thinning
and weight reduction of the housing, the chattering phenomenon occurs in the audio output from
the speaker as in the above-described audio reproduction device described in Patent Document 1
It is conceivable to reduce the volume of the frequency band to be used.
Specifically, it is conceivable to suppress the volume of the frequency band in which the
chattering phenomenon occurs to a certain level or less.
[0026]
However, when the volume is suppressed only in the frequency band of the resonance frequency
in which the chattering phenomenon occurs, there is a problem that the sound quality is
degraded.
[0027]
Hereinafter, embodiments of the present invention will be described in detail with reference to
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the drawings.
The respective drawings do not necessarily show the respective dimensions or the respective
dimensional ratios etc. exactly.
[0028]
Further, all the embodiments described below show one preferable specific example of the
present invention. Numerical values, shapes, materials, components, arrangement positions and
connection forms of components, steps, order of steps, and the like shown in the following
embodiments are merely examples, and the present invention is not limited thereto. The
invention is specified by the claims. Therefore, among the components in the following
embodiments, components not described in the independent claims are not necessarily required
to achieve the object of the present invention, but are described as constituting a more preferable
embodiment. Be done.
[0029]
(First Embodiment) The audio reproduction apparatus and the audio reproduction method
according to the first embodiment will be described with reference to FIGS.
[0030]
The sound reproducing apparatus according to the present embodiment does not change the
magnitude relationship of the level (amplitude) of the sound pressure between the adjacent
frequency bands, in the sound pressure of the frequency band (first frequency band) where the
chattering phenomenon occurs. In addition to level suppression, adjustment of the sound
pressure level of the second frequency band adjacent to the first frequency band is performed.
[0031]
The frequency at which the chattering phenomenon occurs is, specifically, a vibration frequency
specific to a housing that accommodates the audio reproduction device.
More specifically, it is the resonance frequency of the sound emitted from the speaker of the
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sound reproduction apparatus and the casing.
Further, among the frequencies at which the chattering phenomenon occurs, it is considered that
abnormal noise occurs at a frequency in the human audible range (for example, 20 Hz or more
and 1400 to 16000 Hz or less).
[0032]
FIG. 1 is a block diagram showing an example of an audio reproduction apparatus. The audio
reproduction apparatus according to the present embodiment is a TV (television) 1 as shown in
FIG. The TV 1 includes, in a housing 30, a circuit constituting the audio reproduction unit 10A
(10) and a speaker 20.
[0033]
<1−1. Configuration of Audio Reproduction Unit 10A> The configuration of the audio
reproduction unit 10A will be described with reference to FIG. FIG. 2 is a block diagram showing
the configuration of the audio reproduction unit 10A.
[0034]
The audio reproduction unit 10A is configured to include a circuit such as an LSI (Large Scale
Integration: large scale integrated circuit) or the like that executes processing for reducing
chatter on the input second audio signal.
[0035]
The audio reproduction unit 10A includes an audio signal input unit 11, a signal control unit 12,
and an audio amplifier 13 as shown in FIG.
[0036]
The audio signal input unit 11 is a circuit that receives the second audio signal from the outside
and outputs the second audio signal to the signal control unit 12.
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[0037]
The signal control unit 12 includes units LV (LV1 to LVn) and a threshold setting unit ST.
Note that n is an integer of 2 or more, and more specifically, may be a power of two.
[0038]
The units LV (LV1 to LVn) are provided for each of a plurality of frequency bands fr1 to frn of
the same bandwidth.
[0039]
The unit LVi (i = 1 to n) includes a band-pass filter (BPF) Bi and a limiter LIi.
[0040]
The band pass filter Bi is a filter that passes a specific frequency band of the input second audio
signal.
The frequency bands fr1 to frn of the band pass filters B1 to Bn are set so as not to overlap and
that there is no frequency that can not pass through any of the band pass filters B1 to Bn.
More specifically, the second audio signal is divided into n frequency bands fr1 to frn of the same
bandwidth, and one of the frequency bands fr1 to frn is assigned to each of the band pass filters
B1 to Bn.
In addition, the frequency range is not appropriately set for each second voice signal to be
actually input, but the entire range of frequencies that may be input as the second voice signal is
divided into n, and each band is divided. The frequency bands fr1 to frn of the pass filters B1 to
Bn are set.
In the following description, of the frequency bands fr1 to frn, the resonance frequency band is
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frj.
[0041]
The limiter LIi is a circuit that limits the level (amplitude) of the signal output from the band pass
filter Bi to a threshold (upper limit) set by a threshold setting unit ST described later.
[0042]
The threshold setting unit ST is a circuit that sets thresholds for the limiters LI1 to LIn.
The threshold setting unit ST extracts the amplitudes of the frequency bands fr1 to frn from the
second audio signal. The threshold setting unit ST sets the threshold so as to maintain the
magnitude relationship between the amplitudes of adjacent two frequency bands for each of the
plurality of frequency bands fr1 to frn. Further, the threshold value of the resonance frequency
band frj is a value that is considered not to generate a chattering phenomenon, and in the
present embodiment, it is a fixed value regardless of the second audio signal.
[0043]
<1−2. Operation of Audio Reproduction Unit 10A> The operation of the audio reproduction
unit 10A will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of
the audio reproduction unit 10A in the present embodiment.
[0044]
The threshold setting unit ST receives the second audio signal from the audio signal input unit
11, and acquires an amplitude for each frequency band (S10). FIG. 4 is a graph showing an
example of the amplitude of each frequency band of the second audio signal. In the present
embodiment, as described above, the division number n of the second audio signal is a power of
2, for example, 16, 32, and the second audio signal is divided into frequency bands fr1 to frn. .
FIG. 4 shows frequency bands fr1 to fr9 of a part of the second audio signal for the sake of
explanation. In FIG. 4, a solid line is a threshold value LT provided corresponding to the
chattering phenomenon. In FIG. 4, as can be understood from the threshold value LT, the
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frequency band fr3 is a frequency band in which the chattering phenomenon occurs.
[0045]
The threshold setting unit ST sets the second frequency band and the threshold of the second
frequency band when the amplitude of the frequency band fr3 in which the chattering
phenomenon occurs is equal to or less than the first level ( below the first level in S11). End
the process.
[0046]
When the amplitude of the frequency band fr3 in which the chattering phenomenon occurs is
larger than the first level ( greater than the first level in S11), the threshold setting unit ST
sets the threshold (first) to the limiter LI3 corresponding to the frequency band fr3. Set the level).
[0047]
The threshold setting unit ST derives an envelope of amplitude for each frequency band (S12).
In FIG. 4, the envelope LE1 is indicated by an alternate long and short dash line.
As shown in FIG. 4, the envelope LE1 has two maximum values PT1 and PT2 and three minimum
values PB1 to PB3.
[0048]
The threshold setting unit ST sets a second frequency band using the envelope LE1 (S13). The
threshold setting unit ST sets a frequency band fr2 other than the frequency band fr3 between
the two frequency bands fr1 and fr5 surrounding the frequency band fr3 in which the chatter
phenomenon occurs among the three frequency bands having the minimum values PB1 to PB3
and the frequency band fr2 and Set fr4 as the second frequency band. In the present
embodiment, frequency bands fr1 and fr5 taking minimum values PB1 and PB2 are further set as
the second frequency band.
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[0049]
The frequency bands fr1 and fr5 which take the minimum values PB1 and PB2 may not be set as
the second frequency band. Further, whether or not to set the second frequency band may be
dynamically changed according to the magnitude relationship between the frequency bands fr1
and fr5 and the threshold of the frequency band fr3 in which the chattering phenomenon occurs.
For example, when the levels of the frequency bands fr1 and fr5 are larger than the
predetermined value set according to the upper limit value of the amplitude of the frequency
band fr3, the second frequency band is set. If the levels of the frequency bands fr1 and fr5 are
smaller than a predetermined value, they may not be set as the second frequency band.
[0050]
The threshold setting unit ST sets the upper limit value (second level) of the amplitude of the
second frequency band (S14). The threshold setting unit ST sets the upper limit value of the
amplitude so that the magnitude relation of the amplitude does not change between the adjacent
frequency bands for each of the frequency bands fr1, fr2, fr4, and fr5 which are the second
frequency band. . The upper limit value of the amplitude of the frequency band fr3 is determined
according to the chattering phenomenon, so a fixed value is set.
[0051]
In FIG. 4, the upper limit values of the amplitudes of the frequency bands fr2 and fr4 are set to
values smaller than the frequency band fr3. The upper limit value of the amplitude of the
frequency band fr1 is set to a value smaller than the frequency band fr2. The upper limit value of
the amplitude of the frequency band fr5 is set to a value smaller than the frequency band fr4.
[0052]
More specifically, for example, the ratio of the threshold to the level of the frequency band fr3
multiplied by the level of the frequency bands fr1 to fr5 is set as the upper limit value of the
amplitude. Alternatively, an envelope corresponding to the upper limit value of the amplitude of
the frequency band fr3 may be derived among the frequency bands fr1 to fr5, and the upper
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limit value of the amplitude of the frequency bands fr1 to fr5 may be determined based on the
envelope.
[0053]
FIG. 5 is a graph showing an example of the amplitude of each frequency band of the first audio
signal obtained by level adjustment of the second audio signal. In FIG. 5, the magnitude
relationship of the amplitudes of the frequency bands, the number of maximum values PT11 and
PT2 of the envelope LE2, and the positions and numbers of the minimum values PB11, PB12,
and PB3 are the same as those in FIG.
[0054]
The threshold setting unit ST sets the upper limit value (second level) of the amplitude obtained
in step S14 as the threshold of the limiters LI1 to LIn (S15).
[0055]
<1−3.
Effect etc.> The TV 1 (an example of the audio reproduction device) of the present embodiment
suppresses the sound volume not only in the frequency band causing the chattering phenomenon
but also in the frequency band adjacent to the frequency band, so the output from the speaker
20 It is possible to suppress the degradation of voice quality.
[0056]
As described above, in the TV 1 of the present embodiment, the upper limit value of the
amplitude is set so as to maintain the magnitude relationship between the second frequency
band and the frequency band adjacent to the second frequency band. More specifically, the
upper limit value of the amplitude is set so as to maintain the number of maximum values and
minimum values of the envelope. This is because it is considered that the sound quality is
degraded if the magnitude relationship, more specifically, the number of maximum values and
minimum values of the envelope changes.
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[0057]
Here, FIG. 6 shows an example of the sound output from the speaker 20 when the volume of only
the frequency band fr3 causing the chattering phenomenon is limited. In FIG. 6, the maximum
values of the envelope LE3 are three, that is, PT21, PT22, and PT23, and the minimum values are
four, that is, PB1, PB21, PB22, and PB3. The numbers of maximum values and minimum values
of the envelope LE3 shown in FIG. 6 are different from the numbers of maximum values and
minimum values of the envelope LE1 shown in FIG. Therefore, in the case of FIG. 6, the sound
quality is considered to be degraded.
[0058]
On the other hand, in the present embodiment, as shown in FIG. 5, the numbers of maximum
values and minimum values of the envelope LE2 are the same as the numbers of maximum
values and minimum values of the envelope LE1 shown in FIG. There is. It can be understood
from FIG. 5 that the TV 1 of the present embodiment can suppress the deterioration of the sound
quality.
[0059]
Second Embodiment An audio reproduction apparatus and an audio reproduction method
according to a second embodiment will be described with reference to FIGS. 7 and 8. FIG.
[0060]
As in the first embodiment, the audio reproduction device according to the present embodiment
does not change the magnitude relation between the levels (amplitudes) of sound pressure
between adjacent frequency bands. In addition to the suppression of the sound pressure level of
one frequency band, the sound pressure level of the second frequency band adjacent to the first
frequency band is adjusted.
[0061]
In the present embodiment, a case where the configuration of the audio reproduction unit 10 is
different from that of the first embodiment will be described.
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[0062]
The audio reproduction apparatus of the present embodiment is a TV (television) 1 as in the first
embodiment shown in FIG.
The TV 1 includes an audio reproduction unit 10B (10) and a speaker 20 in a housing 30.
[0063]
<2−1.
Configuration of Audio Reproduction Unit 10B> The configuration of the audio reproduction unit
10B will be described with reference to FIG.
FIG. 7 is a block diagram showing the configuration of the audio reproduction unit 10B.
[0064]
The audio reproduction unit 10B is configured to include an input I / F (interface) 15, a CPU
(Central Processing Unit) 16, a storage unit 17, and an output I / F 18.
[0065]
The input I / F 15 receives the second audio signal from the outside.
[0066]
The CPU 16 reads a computer program (software) for executing each step included in the audio
reproduction method of the present embodiment from the storage unit 17 and executes the
computer program to execute the audio reproduction of the present embodiment. Execute the
method.
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Here, the computer program is configured by combining a plurality of instruction codes
indicating instructions to the computer in order to achieve a predetermined function.
[0067]
The CPU 16 generates a first audio signal capable of suppressing the occurrence of the
chattering phenomenon by executing each step included in the audio reproduction method on
the second audio signal acquired by the input I / F 15.
The CPU 16 outputs the generated first audio signal to the speaker 20 via an output I / F 18
described later.
[0068]
The storage unit 17 is configured using an arbitrary storage circuit such as a random access
memory (RAM) and a read only memory (ROM). The storage unit 17 stores the above-described
computer program and the like in the present embodiment.
[0069]
The output I / F 18 outputs the first audio signal generated by the CPU 16 to the speaker 20.
[0070]
<2−2.
Operation of Audio Reproduction Unit 10B> The operation of the audio reproduction unit 10B
will be described with reference to FIG. FIG. 8 is a flowchart showing the operation of the audio
reproduction unit 10B in the present embodiment.
[0071]
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When the CPU 16 receives the second audio signal from the input I / F 15, the CPU 16 performs
window processing on the second audio signal (S20). The window processing is processing for
dividing the second audio signal having a continuous time sequence into a plurality of window
signals of a specific length.
[0072]
The CPU 16 executes FFT (Fast Fourier Transform) processing on the window signal (S21). The
FFT processing is processing for converting a window signal in the time domain into a signal in
the frequency domain.
[0073]
The CPU 16 executes subband processing on the signal in the frequency domain (S22). In
subband processing, each component (coefficient) of the signal in the frequency domain is
regarded as one subband (frequency band), and level (amplitude) adjustment is performed on
each subband.
[0074]
The adjustment of the level includes the adjustment of the level to the first frequency band where
the chattering phenomenon occurs and the adjustment of the level to the second frequency band
adjacent to the first frequency band.
[0075]
The CPU 16 reduces the level of the first frequency band below the first level when the level of
the first frequency band where the chattering phenomenon occurs exceeds the first level.
The CPU 16 also derives an envelope from the level of each frequency band. The CPU 16 obtains
the maximum value and the minimum value of the envelope, and sets the second frequency band
according to the position of the first frequency band where the chattering phenomenon occurs
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and the position of the minimum value of the envelope. The method of setting the second
frequency band is the same as that of the first embodiment.
[0076]
The CPU 16 further sets a second level for each of the second frequency bands, and reduces the
level of the second frequency band below the second level. The setting method of the second
level is the same as that of the first embodiment. The CPU 16 sets the second level of the second
frequency band so that the magnitude relation of the amplitudes does not change between the
adjacent frequency bands.
[0077]
The CPU 16 performs I-FFT (Inverse FFT, inverse fast Fourier transform) processing on the signal
in the frequency domain after subband processing, and inversely transforms it into a window
signal in the time domain (S23).
[0078]
The CPU 16 executes time axis restoration processing for generating a first audio signal having a
continuous time sequence, using the window signal generated in step S23 (S24).
More specifically, the CPU 16 rearranges the window signal along the time axis, and performs
addition processing of the overlapping portion of the edge of the window signal.
[0079]
<2−3. Effects etc.> As in the first embodiment, the TV 1 (an example of the audio
reproduction device) of this embodiment is not limited to the frequency band that generates the
chattering phenomenon, and the volume of the frequency band adjacent to the frequency band.
Since it suppresses, it becomes possible to suppress that the quality of the sound outputted from
speaker 20 falls.
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[0080]
In the first embodiment, the second audio signal is processed using a circuit such as an LSI,
whereas in the present embodiment, the second audio signal is processed by software. However,
it is possible to suppress the degradation of the quality of the sound output from the speaker 20.
[0081]
(Other Embodiments) Although the audio reproduction apparatus according to the embodiment
of the present invention has been described above, the present invention is not limited to this
embodiment.
[0082]
(1) For example, the audio reproduction apparatus may be applied to an apparatus other than the
TV 1, for example, an audio apparatus such as a BD (Blu-ray (registered trademark) Disc) player.
[0083]
(2) In the first embodiment, the case where the audio reproduction device is configured using
one system LSI has been described, but the present invention is not limited to this.
The system LSI is a super-multifunctional LSI manufactured by integrating a plurality of
components on one chip, and more specifically, a computer system including a microprocessor, a
ROM, a RAM, and the like. .
[0084]
Further, in the second embodiment, the case where the audio reproduction apparatus is
configured using a computer system including a CPU, a ROM, a RAM, and the like has been
described, but the present invention is not limited to this.
The computer system may include a microprocessor, a hard disk drive, a display unit, a keyboard,
a mouse, and the like.
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[0085]
Furthermore, in the second embodiment, part or all of the computer program may be stored in an
IC card or a single module that can be attached to and removed from each device.
The IC card or module is a computer system including a microprocessor, a ROM, a RAM, and the
like. The IC card or module may include the above-described ultra-multifunctional LSI. The IC
card or module achieves its functions by the microprocessor operating according to the
computer program. This IC card or this module may be tamper resistant.
[0086]
In the second embodiment, a computer program or a digital signal consisting of a computer
program can be recorded on a non-transitory computer-readable recording medium, such as a
flexible disk, a hard disk, a CD-ROM, an MO, a DVD, a DVD-ROM, a DVD. The data may be
recorded in a RAM, a BD (Blu-ray (registered trademark) Disc), a semiconductor memory, or the
like. In addition, the digital signal may be recorded on the non-temporary recording medium.
[0087]
In the present invention, the computer program or the digital signal may be transmitted via a
telecommunication line, a wireless or wired communication line, a network represented by the
Internet, data broadcasting, and the like.
[0088]
The present invention may be a computer system comprising a microprocessor and a memory,
wherein the memory stores the computer program, and the microprocessor operates according
to the computer program.
[0089]
In addition, another computer is independent by recording and transferring the program or the
digital signal on the non-temporary recording medium, or transferring the program or the digital
signal via the network or the like. It may be implemented by a system.
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[0090]
Furthermore, the above embodiment and the above modification may be combined respectively.
[0091]
The present invention is useful for an audio reproduction device that may generate chattering,
for example, an audio device such as a TV or a BD player.
[0092]
1 TV 10, 10A, 10B Audio Reproduction Unit 11 Audio Signal Input Unit 12 Signal Control Unit
13 Audio Amplifier 15 Input I / F 16 CPU 17 Storage Unit 18 Output I / F 20 Speaker 30 Case B,
B1 to Bn Band Pass Filters LI, LI1 to LIn limiter LV, LV1 to LVn unit ST threshold setting part
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