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JP2011176489

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DESCRIPTION JP2011176489
The present invention provides an acoustic signal correction apparatus and an acoustic signal
correction method capable of easily achieving high sound quality of a listening sound by
suppressing a resonance phenomenon caused by occlusion of the ear canal. An amplitude value
in a frequency band in which resonance may occur due to an ear canal occlusion is emphasized,
and an amplitude value in the frequency position is calculated for each of a plurality of frequency
positions included in the frequency band. Corresponding to the acoustic signal received by the
selection accepting means, an output means for outputting a plurality of corrected acoustic
signals, a selection accepting means for accepting selection of one acoustic signal from the
plurality of acoustic signals outputted by the output means And holding means for holding the
setting relating to the correction at the frequency position as the setting for sound quality
correction. [Selected figure] Figure 2
Acoustic signal correction apparatus and acoustic signal correction method
[0001]
The present invention relates to an acoustic signal correction apparatus and an acoustic signal
correction method.
[0002]
It is known that the occlusion of the ear canal by earphones or headphones causes a resonance
phenomenon in the ear canal.
08-05-2019
1
Since such a resonance phenomenon affects the sound and so on, the listener hears an unnatural
sound. Therefore, in order to eliminate the generation of the unnatural sound, a technique has
been proposed for the purpose of suppressing a resonance phenomenon generated in a space
formed by the ear and the earphone or the ear and the headphone.
[0003]
For example, Patent Document 1 discloses a correction method for canceling a peak (resonance
peak) of a resonance frequency detected by a measurement earphone to which a microphone is
attached. Further, in Patent Document 1, a sound source signal is output from an earphone for
measurement, a frequency characteristic of an audio signal collected by a microphone attached
to the earphone for measurement and disposed in an ear canal is determined, and detected from
the frequency characteristic. A method is disclosed for reducing resonant frequency components
in the ear canal. Further, Patent Document 2 discloses a listener as a technology for eliminating a
sense of blockage when wearing headphones, by clustering transfer functions different for each
individual and reducing the type of filter coefficient of a filter that controls the sense of sound
image localization. A technique is disclosed to reduce the burden of setting the
[0004]
JP, 2009-194769, A Patent 271817
[0005]
However, in the technique of Patent Document 1, hardware for measuring the sound in the ear
canal is required, so there is a problem that the hardware implementation cost increases.
There is also a problem that it is difficult to obtain such hardware generally. Further, in the
technique of Patent Document 2, at least 16 times of trial listening are required to determine an
appropriate filter coefficient, there is a problem that setting of the filter coefficient is still
complicated. In addition, since there are cases where the difference between different settings is
minute, it is not easy to recognize the difference in sound quality in each setting.
[0006]
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2
The present invention has been made in view of the above, and it is an acoustic signal correction
apparatus and an acoustic signal correction method capable of easily achieving high-quality
listening sound by suppressing a resonance phenomenon caused by occlusion of the ear canal.
Intended to provide.
[0007]
In order to solve the problems described above and achieve the object, the present invention
emphasizes amplitude values in a frequency band in which resonance may occur due to an ear
canal occlusion, and any of the frequency bands included in the frequency band Output means
for outputting a plurality of acoustic signals in which the amplitude value at the frequency
position is corrected for each of a plurality of frequency positions, and selection accepting means
for receiving selection of one acoustic signal from the plurality of acoustic signals outputted by
the output means And holding means for holding the setting relating to the correction at the
frequency position corresponding to the audio signal received by the selection receiving means
as the setting for sound quality correction.
[0008]
Further, according to the present invention, the output means emphasizes an amplitude value in
a frequency band in which resonance may occur due to an ear canal occlusion, and the frequency
is set for each of a plurality of frequency positions included in the frequency band. An output
step of outputting a plurality of acoustic signals in which the amplitude value at the position is
corrected; a selection receiving step of accepting selection of one acoustic signal from the
plurality of acoustic signals output in the output step; And a holding step of holding the setting
relating to the correction at the frequency position corresponding to the acoustic signal received
in the selection receiving step as the setting of the sound quality correction.
[0009]
According to the present invention, it is possible to provide an acoustic signal correction
apparatus and an acoustic signal correction method capable of suppressing the resonance
phenomenon caused by the occlusion of the ear canal and easily achieving high sound quality of
the listening sound.
[0010]
FIG. 1 is a diagram illustrating an example of the sound processing apparatus.
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FIG. 2 is a diagram showing the configuration of the sound reproduction device.
FIG. 3 is a view showing an example of the measurement result of the resonance generated in the
ear canal.
FIG. 4 is a diagram showing the relationship between primary resonance frequency and
secondary resonance frequency measured for the left ear of many subjects.
FIG. 5 is a diagram showing the relationship between primary resonance frequency and
secondary resonance frequency measured for the right ear of many subjects. FIG. 6 is a diagram
showing an example of the frequency characteristic of the test signal. FIG. 7 is a diagram for
explaining the operation of the band extraction unit. FIG. 8 is a diagram for explaining the
operation of the adding unit. FIG. 9 is a diagram for explaining the principle of the correction
filter used in the signal processing unit. FIG. 10 is a diagram for explaining the operation of the
signal processing unit. FIG. 11 is a diagram illustrating the correction filters included in the
signal processing unit. FIG. 12 is a diagram illustrating an example of a UI provided by the
selection unit. FIG. 13 is a diagram illustrating an example of the procedure of the filter change
process. FIG. 14 is a diagram for explaining the filter change process. FIG. 15 is a diagram for
explaining the filter change process. FIG. 16 is a diagram showing another configuration example
of the sound reproduction device. FIG. 17 is a diagram showing another configuration example of
the sound reproduction device.
[0011]
Hereinafter, embodiments of an acoustic signal correction apparatus and an acoustic signal
correction method according to the present invention will be described in detail with reference to
the accompanying drawings. Although an example in which the present invention is applied to an
audio processing apparatus such as a portable audio player will be described below, the present
invention is not limited to this embodiment.
[0012]
FIG. 1 is a diagram showing an example of a sound processing apparatus 100 according to the
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4
present embodiment. As shown in the figure, the sound processing device 100 is composed of a
sound reproduction device 110 and an earphone 120.
[0013]
The sound reproduction device 110 includes a two-folded housing coupled by a hinge portion
(not shown), and a display portion 31 and an operation input portion 32 described later are
provided on the inner side surface thereof. The earphone 120 is a canal type earphone or the
like, and is used in a state of being attached to the listener's ear. In addition, although the case
where the earphone 120 is a canal type is described in the present embodiment, the present
invention is not limited to this, and another format or headphones may be used.
[0014]
FIG. 2 is a diagram showing the configuration of the sound reproduction device 110. As shown in
FIG. As shown in the figure, the sound reproduction device 110 includes a test signal generation
unit 10, a conversion unit 20, a selection unit 30, an sound signal generation unit 40, and a filter
processing unit 50. The test signal generation unit 10 is configured to include a band extraction
unit 11, an addition unit 12, and a signal processing unit 13.
[0015]
The band extraction unit 11 is a high pass filter, a band pass filter, or the like, and extracts a
component of a specific frequency band with respect to a test acoustic signal (hereinafter
referred to as a test signal) output from the acoustic signal generation unit 40. . The frequency
band to be extracted by the band extraction unit 11 will be described below with reference to
FIGS. 3 to 5.
[0016]
As described above, when the listener L wears the earphone 120 and listens to sounds,
resonance occurs in the closed space in the ear including the ear canal formed by the ear of the
listener L and the earphone 120. . Here, FIG. 3 is a view showing an example of the measurement
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5
result of the resonance state generated in the ear canal of a subject (listener L) wearing the
earphone 120. As shown in FIG.
[0017]
The graph shown in FIG. 3 shows the measurement results of the respective resonance
characteristics as the ear characteristics of the subject's right and left ears, where the horizontal
axis represents frequency and the vertical axis represents frequency amplitude (gain). ing. As can
be seen from FIG. 3, it is measured that there are resonance peaks as the amplitudes of the
respective frequencies of the right and left ears, which indicate the resonance of each ear.
[0018]
Specifically, in the frequency characteristic of the left ear shown by the solid line in FIG. 3, there
is a peak (hereinafter referred to as a resonance peak) generated by a resonance phenomenon
around the frequency position shown by fL1 and the frequency position shown by fL2. Existing.
Further, in the frequency characteristic of the right ear indicated by the broken line, a resonance
peak is present in the vicinity of the frequency position indicated by fR1 and the frequency
position indicated by fR2. Hereinafter, in the present embodiment, of the resonance frequencies
at which the amplitude is a resonance peak in each ear, the one with lower frequency (fL1, fR1) is
called primary resonance frequency, and the one with higher frequency (fL2, fR2) is called It is
called secondary resonance frequency.
[0019]
By the way, since the shape of the human ear is different for each individual, the ear
characteristics are also different for each individual. For this reason, the resonance characteristic
which arises at the time of earphone wearing also differs for every individual. The inventors
analyzed the result of measuring the resonance characteristics when wearing the earphone for a
plurality of persons, and revealed that a resonance peak occurs in a band higher than 5 kHz.
[0020]
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6
FIGS. 4 and 5 are diagrams showing the relationship between the primary resonance frequency
and the secondary resonance frequency measured for the ears (left ear, right ear) of a large
number of subjects wearing the earphone 120. FIG. Here, FIG. 4 is a view showing the
relationship between the primary resonance frequency and the secondary resonance frequency
generated in the left ear of each subject, and the horizontal axis represents the distribution of the
primary resonance frequency, and the vertical axis represents the secondary resonance. It
represents the distribution of frequency. FIG. 5 is a diagram showing the relationship between
the primary resonance frequency and the secondary resonance frequency generated in the right
ear of each subject, the horizontal axis representing the distribution of primary resonance
frequencies and the vertical axis representing the secondary resonance frequencies. Represents
the distribution of
[0021]
According to the measurement results shown in FIG. 4 and FIG. 5, it can be seen that the primary
resonance frequency is distributed approximately at 5 kHz to 9 kHz. It can be seen that the
secondary resonance frequencies are distributed approximately at 10 kHz to 14 kHz. Therefore,
in the band extraction unit 11, among the frequency bands constituting the test signal, a
frequency band in which resonance may occur due to occlusion of the ear canal, that is, a
frequency including the above-mentioned primary resonance frequency and secondary
resonance frequency. The components of the band (5 kHz to 14 kHz) are extracted. Hereinafter, a
frequency band in which resonance may occur due to an ear canal occlusion is referred to as a
resonance frequency band.
[0022]
For example, assuming that the test signal is represented by the frequency characteristic P
shown in FIG. 6, the band extraction unit 11 sets f 1 to f 2 including the primary resonance
frequency and the secondary resonance frequency shown in FIG. Extract components (amplitude
values) of the frequency band. Here, FIG. 6 is a diagram showing an example of the frequency
characteristic of the test signal, and FIG. 7 is a diagram for explaining the operation of the band
extraction unit 11. The horizontal axis represents frequency, and the vertical axis represents It
represents the amplitude (gain) of the frequency.
[0023]
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Returning to FIG. 2, the adding unit 12 is an adder, an amplifier, or the like, adds the component
of the specific band extracted by the band extracting unit 11 to the test signal, and outputs the
test signal to the signal processing unit 13. For example, assuming that the component extracted
by the band extraction unit 11 is a component of the f1 to f2 band in FIG. 7, the addition unit 12
adds this component to the frequency characteristic P, as shown by a solid line in FIG. Generate a
frequency characteristic P1. That is, the adding unit 12 cooperates with the band extracting unit
11 to amplify the amplitude value in the resonance frequency band included in the test signal.
Here, FIG. 8 is a diagram for explaining the operation of the adding unit 12, and the broken line
indicates the frequency characteristic P before being added. Note that the degree (amplification
factor) of addition to the frequency characteristic P can be set to any value.
[0024]
As a characteristic of the human ear, it is known that the sound in the resonance frequency band
including the primary resonance frequency and the secondary resonance frequency has a
resolution that is not very high as described later. For this reason, even if a sense of incongruity
occurs in the sound to be heard due to the resonance phenomenon occurring in the ear canal, it
is difficult to determine the frequency band that is the cause. Therefore, the adder 12 cooperates
with the band extraction unit 11 to amplify the amplitude value of the resonance frequency band,
thereby modulating the test signal so that the change in the sound quality due to the resonance
phenomenon can be easily determined.
[0025]
In this embodiment, the amplitude value in the resonance frequency band is amplified to
emphasize the component in the resonance frequency band. However, the present invention is
not limited to this. Instead of amplifying the amplitude value in the resonance frequency band,
the resonance frequency may be increased. The components in the resonance frequency band
may be emphasized by reducing the components other than the band. In this case, for example, a
test signal input to the test signal generation unit 10 to which multiplication is applied is used as
one input to the addition unit 12 and a test signal other than the resonance frequency band
extracted by the band extraction unit 11 By attenuating the internal components, the
components of the resonant frequency band can be emphasized. Alternatively, components other
than the resonance frequency band in the test signal are extracted using the band extraction unit
11 realized by a low pass filter, band pass filter or the like, and the addition unit 12 is changed to
a subtraction unit and extracted by the band extraction unit 11 Components other than the
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8
resonance frequency band in the test signal may be subtracted from the test signal to emphasize
the components in the resonance frequency band. Also, instead of the adding unit 12 and the
band extracting unit 11, the same function may be realized by a filter having a frequency
characteristic that emphasizes the resonance frequency band.
[0026]
Returning to FIG. 2, the signal processing unit 13 subjects the test signal input from the addition
unit 12 to signal processing for changing the frequency characteristic of the test signal, and
outputs the result to the conversion unit 20. Specifically, the signal processing unit 13 is added
by the addition unit 12 using a correction filter having a frequency characteristic instructed from
the listener L through the selection unit 30 among a plurality of types of correction filters having
different frequency characteristics. Correction of the frequency characteristic portion. It is
assumed that a signal processing circuit and each correction filter according to each frequency
characteristic are incorporated in the signal processing unit 13 in advance.
[0027]
FIG. 9 is a diagram for explaining the principle of the correction filter used in the signal
processing unit 13. In the figure, the solid line represents the ear characteristic E of the listener L
wearing the earphone 120. The broken line represents the frequency characteristic of the
correction filter. Here, the correction filters F11 to F13 are correction filters for suppressing
(reducing) the resonance peak at the primary resonance frequency, and the correction filters F21
to F23 are correction filters for suppressing the resonance peak at the secondary resonance
frequency. is there. The horizontal axis represents the frequency, and the vertical axis represents
the amplitude (gain) of the frequency.
[0028]
As shown in FIG. 9, the correction filter used by the signal processing unit 13 is a frequency filter
for suppressing the resonance peak at the primary resonance frequency and the secondary
resonance frequency. The signal processing unit 13 has a plurality of types of correction filters
having different center frequencies in order to correspond to the ear characteristics of each
person who is the listener L, and the signal processing unit 13 responds to the selection signal
from the selection unit 30 among the plurality of correction filters. The frequency characteristics
08-05-2019
9
of the test signal output from the adding unit 12 are changed by using the correction filter.
[0029]
For example, when the test signal having the frequency characteristic P1 shown in FIG. 8 is
output from the adding unit 12 and the correction filters F11 and F21 are designated via the
selecting unit 30, the signal processing unit 13 as shown in FIG. Then, the frequency
characteristics of the frequency characteristic P1 are changed using the correction filters F11
and F21. Here, FIG. 10 is a diagram for explaining the operation of the signal processing unit 13.
[0030]
By the way, as a characteristic of the human ear, it is known that the frequency resolution
becomes coarser as it goes to a higher range. For this reason, when determining the filter
coefficients of the correction filter, the resonance frequencies of the listener L and the center
frequency of the correction filter do not have to be exactly the same.
[0031]
In this regard, the inventors precisely match the resonance frequency to the center frequency of
the correction filter, and place the center frequency of the correction filter at a frequency
position shifted by about 500 Hz before and after the resonance frequency. A comparative
experiment was performed. As a result, it is confirmed that the difference in sound quality can
not be determined between the two. In addition, since the second resonance frequency band is in
a higher tone range, it is possible to cope with the adjustment with coarser precision than the
first resonance frequency band.
[0032]
Therefore, in order to suppress the resonance peak due to the first resonance frequency, it is
necessary to obtain sufficient effects by using five types of correction filters, for example, every 5
kHz to 1 kHz based on the distribution results of FIG. 4 and FIG. Can. In addition, a sufficient
effect can be obtained by using a correction filter with a coarser accuracy to suppress the
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10
resonance peak due to the secondary resonance frequency.
[0033]
Note that the signal processing unit 13 has a plurality of types of correction filters for each of the
resonance peak (hereinafter referred to as the first resonance peak) generated by the first
resonance frequency and the resonance peak (hereinafter the second resonance peak) generated
by the second resonance frequency. It is good also as a form provided, and it is good also as a
form provided with multiple types of correction filters about any one resonance peak. In addition,
a plurality of types of correction filters capable of simultaneously suppressing the primary
resonance peak and the secondary resonance peak may be provided. In this case, according to
the distribution results shown in FIG. 4 and FIG. 5, there is a strong positive correlation between
the primary resonance frequency and the secondary resonance frequency that the higher the
primary resonance frequency, the higher the secondary resonance frequency. It is understood
that there is. Focusing on this correlation, it is possible to reduce the combination of filter
coefficients that suppress both the primary co-peak and the secondary resonance peak.
[0034]
For example, in FIG. 4, in the case of a person having a 7 kHz primary resonance phenomenon, it
can be seen that the secondary resonance phenomenon occurs near 12 kHz. In this case, there is
almost no second-order resonance phenomenon such as below 10 kHz or above 14 kHz.
Therefore, in order to suppress the secondary resonance phenomenon, three types of correction
filters having a center frequency of 11 to 13 kHz may be used. Furthermore, in consideration of
the roughness of the frequency resolution in high band listening, for example, only a correction
filter with a center frequency of 12 kHz may be used for the secondary resonance frequency.
[0035]
As described above, in the case of using a correction filter that simultaneously suppresses the
primary resonance peak and the secondary resonance peak, the types of correction filters can be
limited to several types. In the present embodiment, as shown in FIG. 11, the signal processing
unit 13 includes a correction filter F1 that suppresses resonance peaks in the 5 kHz band and 10
kHz band, and a correction filter F2 that suppresses the resonance peaks in the 6 kHz band and
11 kHz band, A total of four correction filters are provided, including a correction filter F3 that
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11
suppresses resonance peaks in the 7 kHz band and 12 kHz band, and a correction filter F4 that
suppresses resonance peaks in the 8 kHz band and 13 kHz band. Each correction filter can be
generated by a known method, and the amplitude and the band width forming the reverse peak
in each correction filter can be set to any value.
[0036]
Returning to FIG. 2, the conversion unit 20 converts the test signal output from the test signal
generation unit 10 (signal processing unit 13) or the acoustic signal output from the filter
processing unit 50 into an electrical signal, and outputs the electrical signal to the earphone 120.
. Then, the earphone 120 converts the electrical signal input from the conversion unit 20 into a
sound that can be heard by the listener L. Thus, the listener L can listen to the sound emitted
from the earphone 120 by attaching the earphone 120 to the ear. Also, the listener L is a
correction used to correct an audio signal from a UI (User Interface) described later provided by
the selection unit 30 based on a sound (hereinafter referred to as a test sound) emitted by an
electrical signal converted from a test signal. By selecting the filter, it is possible to change to a
desired sound quality.
[0037]
The selection unit 30 is configured by a microprocessor, a ROM, a RAM, and the like, and
includes a display unit 31 and an operation input unit 32. The display unit 31 includes a display
device such as an LCD or an organic EL, and displays information on an acoustic signal generated
by the acoustic signal generation unit 40 and a predetermined UI under the control of the
selection unit 30. The operation input unit 32 includes input devices such as various buttons and
a touch panel, and receives an operation input by the listener L.
[0038]
In addition, when the selection unit 30 receives an operation input to start changing the setting
of sound quality correction via the operation input unit 32, the display unit 31 causes the display
unit 31 to select a correction filter to be used for the correction of the audio signal. Display.
Then, the selection unit 30 outputs the selection result of the correction filter received via the
operation input unit 32 to the test signal generation unit 10 (signal processing unit 13) and the
filter processing unit 50 as a selection signal.
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12
[0039]
FIG. 12 is a diagram illustrating an example of a UI provided by the selection unit 30. In the
figure, selection buttons B1 and B2 are selection buttons (selection items) for receiving the
selection of the correction filter. When the selection button B1 or B2 is pressed, the selection unit
30 outputs, to the signal processing unit 13 and the filter processing unit 50, a selection signal
instructing a correction filter of the characteristic corresponding to the pressed button. Further,
the determination button B3 is a button for instructing selection determination of the correction
filter. It is assumed that the selection unit 30 holds information (for example, the filter name of
each correction filter, the filter coefficient, and the like) for specifying each of the correction
filters F1 to F4 in advance.
[0040]
The operations to the selection buttons B1 and B2 and the determination button B3 are
performed using various buttons of the operation input unit 32, a touch panel, and the like. The
pointer, the cursor, or the like shown on the display unit 31 may be operated by using various
buttons or touch pads of the operation input unit 32, and the selection buttons B1 and B2 and
the determination button B3 may be pressed. When the display unit 31 also functions as a touch
panel, the selection buttons B1 and B2 and the determination button B3 may be directly pressed.
[0041]
Specifically, the selection unit 30 generates a plurality of groups (hereinafter, referred to as
primary filter groups) by dividing the correction filter group by the number (two in the present
embodiment) of the selection buttons displayed on the UI. . Then, the selection unit 30 selects
one correction filter (hereinafter, referred to as a primary representative filter) as a
representative from each of the primary filter groups, and assigns information for specifying the
primary representative filter to each selection button.
[0042]
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13
In order to make it easy to distinguish changes in sound quality, it is preferable that the
correction filters selected as primary representative filters from each primary filter group are not
adjacent to each other at the center frequency of the series of correction filters. When three or
more correction filters are included in the primary filter group, it is preferable to select a
correction filter having an intermediate center frequency in the primary filter group as a primary
representative filter. The same applies to the selection of representative filters after the second
order.
[0043]
When the selection unit 30 receives pressing of any of the selection buttons to which the
primary representative filter is assigned, the selection unit 30 outputs a selection signal
instructing the primary representative filter assigned to the selection button to the signal
processing unit 13 and the filter processing unit 50 Do. Furthermore, the selection unit 30
determines whether a plurality of correction filters are included in the primary filter group to
which the primary representative filter belongs, and if it is determined that a plurality of
correction filters are included, the correction filter group is used as a UI. A plurality of groups
(hereinafter, referred to as secondary filter groups) are generated by dividing the number of
selection buttons to be displayed. Then, the selection unit 30 selects one correction filter
(hereinafter, referred to as a secondary representative filter) as a representative from each of the
secondary filter groups, and assigns information for specifying the secondary representative
filter to each selection button.
[0044]
When the selection unit 30 receives pressing of the selection button to which the secondary
representative filter is assigned, the selection unit 30 outputs, to the signal processing unit 13
and the filter processing unit 50, a selection signal that indicates the secondary representative
filter assigned to the selection button. When a plurality of correction filters are included in the
second-order filter group to which the second-order representative filter belongs, similarly to the
above, division of the second-order filter group and a representative filter selected from each
group (third-order filter group) Assign to each selection button of (third-order representative
filter). Further, if it is possible to further group, the fourth and subsequent groups and the
selection of the representative filter are sequentially performed in the same manner as described
above.
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[0045]
In addition, in the case of assignment to the selection button of a representative filter,
identification information (for example, correction filter name or correction) capable of
identifying the representative filter that has been assigned to an image (such as an icon)
representing this selection button The center frequency of the filter, the filter coefficient, etc.
may be displayed.
[0046]
For example, in the case of the present embodiment, since the number of correction filters
(correction filters F1 to F4) is four and the number of selection buttons is two, the selection unit
30 sets a group of correction filters F1 and F2 as a first filter group. Divide into groups of
correction filters F3 and F4.
Subsequently, the selection unit 30 selects each of the correction filter F1 and the correction
filter F4 as a primary representative filter from the first order filter group of the correction filters
F1 and F2 and the first order filter group of the correction filters F3 and F4. . Next, the selection
unit 30 assigns information for specifying the correction filter F2 to the selection button B1, and
assigns information for specifying the correction filter F4 to the selection button B2.
[0047]
Here, for example, when the selection button B1 is pressed through the operation input unit 32,
the selection unit 30 selects a selection signal for instructing the correction filter F1 assigned to
the selection button B1 as the signal processing unit 13 and the filter processing unit 50. Output
to As a result, the signal processing unit 13 outputs the test signal subjected to the signal
processing using the correction filter F1, so the listener L wearing the earphone 120 hears the
sound of the test signal.
[0048]
After the correction filter F1 is selected, when pressing of the determination button B3 is
received, the selection unit 30 selects the correction filter group (correction filters F1 and F2)
included in the primary filter group to which the correction filter F1 belongs. By dividing the
number of buttons by 2, the group of the correction filter F1 and the group of the correction
filter F2 are generated as the second filter group.
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[0049]
Then, when the selection unit 30 selects the correction filter F1 and the correction filter F2 as
the secondary representative correction filter, respectively, information for specifying the
correction filter F1 is assigned to the selection button B1, and information for specifying the
correction filter F2 Is assigned to the selection button B2.
[0050]
Here, for example, when the selection button B2 is pressed through the operation input unit 32,
the selection unit 30 selects the selection signal for instructing the correction filter F2 assigned
to the selection button B2 as the signal processing unit 13 and the filter processing unit 50.
Output to
As a result, the signal processing unit 13 outputs the test signal subjected to the signal
processing using the correction filter F2, so that the listener L wearing the earphone 120 hears
the sound of this test signal.
When the decision button B3 is pressed after the selection of the correction filter F2, the
selection unit 30 deletes the UI displayed on the display unit 31.
[0051]
As described above, the selection unit 30 hierarchically divides a plurality of correction filters
into groups based on the number of selection buttons, and assigns one correction filter selected
from each group in the same hierarchy to each selection item. The listener L is provided with a UI
for selecting one correction filter from the group of the hierarchy to the group of the lower
hierarchy. As a result, the listener L can easily compare the difference in sound quality due to the
application of each correction filter, and can select a desired correction filter by an intuitive
operation. In addition, the number of times of listening to the test sound required to make the
final determination can be reduced, and the burden on the listener can be reduced.
[0052]
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Returning to FIG. 2, the sound signal generation unit 40 generates a digital sound signal from
sound data (music data, sound data, etc.) stored in a memory (not shown) or an analog sound
signal input from an external device. , To the filter processing unit 50. Further, when the sound
signal generation unit 40 receives an operation input to start setting change of the sound quality
correction through the operation input unit 32, the sound signal generation unit 40 starts
generation of the test signal and outputs it to the signal processing unit 13.
[0053]
Here, as a test signal, audio signals, such as white noise and music acquired from memory or an
external input, can be used, for example. In the case of compressed data such as audio coding,
voice coding, lossless coding, etc., it may be an audio waveform signal or the like acquired by
performing necessary decoding processing. In addition, although the audio signal of 2ch of L
(Left) and R (Right) is output, it may be a monaural signal or a multi-ch signal. If it is not a
narrow band signal such as a monotone signal but a signal having a broad frequency band
component to some extent, it can be used as a test signal.
[0054]
The filter processing unit 50 is a holding unit such as a storage medium holding a plurality of
correction filters (correction filters F1 to F4) having the same characteristics as the respective
correction filters included in the signal processing unit 13, and any of these correction filters.
And a means for changing the frequency characteristic of the acoustic signal by using one
correction filter. In addition, when receiving the selection signal from the selection unit 30, the
filter processing unit 50 holds the correction filter corresponding to the selection signal as a
correction filter used for sound quality correction of the sound signal input from the sound signal
generation unit 40. Then, the filter processing unit 50 changes the frequency characteristic of
the acoustic signal using the correction filter held for sound quality correction, and outputs the
result to the conversion unit 20.
[0055]
Hereinafter, with reference to FIGS. 13 to 15, the operation of the sound processing apparatus
100 according to the setting change of the correction filter will be described.
08-05-2019
17
[0056]
FIG. 13 is a diagram illustrating an example of the procedure of the filter change process
performed by the selection unit 30.
In addition, as a premise of this process, it is assumed that an operation input to start setting
change of the sound quality correction is performed via the operation input unit 32.
[0057]
First, when the selection unit 30 displays the UI shown in FIG. 12 on the display unit 31 (step
S11), the selection unit 30 assigns information for specifying the correction filter F1 to the
selection button B1 included in the UI and corrects the selection button B2. Information for
designating the filter F4 is assigned (step S12).
[0058]
Here, when the selection unit 30 receives pressing of the selection button B1 (step S13; F1), the
selection unit 30 outputs a selection signal instructing the correction filter F1 assigned to the
selection button B1 to the signal processing unit 13 and the filter processing unit 50. (Step S14).
Next, the selection unit 30 determines whether or not the determination button B3 has been
pressed, and if the pressing of the determination button B3 can not be confirmed (step S15; No),
the process returns to step S13 again.
[0059]
When the selection button B1 is pressed in step S13, the signal processing unit 13 changes the
frequency characteristic of the test signal using the correction filter F1, so that the sound with
the resonance phenomenon suppressed by the correction filter F1 is emitted from the earphone
120. Will be The listener L presses the selection button B1 and the selection button B2, and
determines which is the desired sound quality based on the sound emitted from the earphone
120. When the desired sound quality is determined, the enter button B3 is pressed.
08-05-2019
18
[0060]
After the selection unit 30 receives the selection of the correction filter F1 in step S13, and
receives the pressing of the determination button B3 (step S15; Yes), the information for
specifying the correction filter F1 is assigned to the selection button B1 and the selection button
Information for designating the correction filter F2 is assigned to B2 (step S16).
[0061]
Here, when the selection unit 30 receives pressing of the selection button B1 (step S17; F1), the
selection unit 30 outputs a selection signal instructing the correction filter F1 assigned to the
selection button B1 to the signal processing unit 13 and the filter processing unit 50. (Step S18).
Next, the selection unit 30 determines whether or not the determination button B3 has been
pressed, and if it is not possible to confirm the pressing of the determination button B3 (step
S20; No), the process returns to step S17 again.
[0062]
When the selection button B1 is pressed in step S17, the signal processing unit 13 changes the
frequency characteristic of the test signal using the correction filter F1, so that the sound with
the resonance phenomenon suppressed by the correction filter F1 is emitted from the earphone
120. Will be The listener L presses the selection button B1 and the selection button B2, and
determines which is the desired sound quality based on the sound emitted from the earphone
120. When the desired sound quality is determined, the enter button B3 is pressed.
[0063]
After accepting selection of the correction filter F1 in step S17, the selection unit 30 erases the
UI displayed on the display unit 31 (step S28) when the depression of the decision button B3 is
accepted (step S20; Yes). Finish.
[0064]
08-05-2019
19
In step S17, when depression of the selection button B2 is received (step S17; F2), the selection
unit 30 selects the selection signal indicating the correction filter F2 assigned to the selection
button B2 as the signal processing unit 13 and the filter processing unit It outputs to 50 (step
S19).
Next, the selection unit 30 determines whether or not the determination button B3 has been
pressed, and if it is not possible to confirm the pressing of the determination button B3 (step
S20; No), the process returns to step S17 again.
[0065]
When the selection button B2 is pressed in step S17, the signal processing unit 13 changes the
frequency characteristic of the test signal using the correction filter F2, so that the sound with
the resonance phenomenon suppressed by the correction filter F2 is emitted from the earphone
120. Will be The listener L determines whether or not the desired sound quality is obtained
based on the sound emitted from the earphone 120, and presses the determination button B3
when the sound quality is desired.
[0066]
After accepting selection of the correction filter F2 in step S17, the selection unit 30 erases the
UI displayed on the display unit 31 (step S28) when the depression of the determination button
B3 is accepted (step S20; Yes). Finish.
[0067]
On the other hand, when the depression of the selection button B2 is accepted in step S13 (step
S13; F4), the selection unit 30 performs the signal processing unit 13 and the filtering process on
the selection signal instructing the correction filter F4 assigned to the selection button B2. It
outputs to the part 50 (step S21).
Next, the selection unit 30 determines whether or not the determination button B3 has been
pressed, and if it is not possible to confirm the pressing of the determination button B3 (step
S22; No), the process returns to step S13 again.
08-05-2019
20
[0068]
When the selection button B2 is pressed in step S13, the signal processing unit 13 changes the
frequency characteristic of the test signal using the correction filter F4, so that the sound with
the resonance phenomenon suppressed by the correction filter F4 is emitted from the earphone
120. Will be The listener L presses the selection button B1 and the selection button B2, and
determines which is the desired sound quality based on the sound emitted from the earphone
120. When the desired sound quality is determined, the enter button B3 is pressed.
[0069]
After the selection unit 30 receives the selection of the correction filter F4 in step S13, and
receives the pressing of the determination button B3 (step S22; Yes), the selection button B1
assigns information for specifying the correction filter F3 to the selection button Information for
designating the correction filter F4 is assigned to B2 (step S23).
[0070]
Here, when the selection unit 30 receives pressing of the selection button B1 (step S24; F3), the
selection unit 30 outputs a selection signal instructing the correction filter F3 assigned to the
selection button B1 to the signal processing unit 13 and the filter processing unit 50. (Step S25).
Next, the selection unit 30 determines whether or not the determination button B3 has been
pressed, and if it is not possible to confirm the pressing of the determination button B3 (step
S27; No), the process returns to step S24 again.
[0071]
When the selection button B1 is pressed in step S24, the signal processing unit 13 changes the
frequency characteristic of the test signal using the correction filter F3, so that the sound with
the resonance phenomenon suppressed by the correction filter F3 is emitted from the earphone
120. Will be The listener L presses the selection button B1 and the selection button B2, and
determines which is the desired sound quality based on the sound emitted from the earphone
08-05-2019
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120. When the desired sound quality is determined, the enter button B3 is pressed.
[0072]
After accepting selection of the correction filter F3 in step S24, the selection unit 30 erases the
UI displayed on the display unit 31 (step S28) when the depression of the determination button
B3 is accepted (step S27; Yes). Finish.
[0073]
In step S24, when depression of the selection button B2 is received (step S24; F4), the selection
unit 30 selects the selection signal for instructing the correction filter F4 assigned to the
selection button B2 as the signal processing unit 13 and the filter processing unit It outputs to
50 (step S26).
Next, the selection unit 30 determines whether or not the determination button B3 has been
pressed, and if it is not possible to confirm the pressing of the determination button B3 (step
S27; No), the process returns to step S24 again.
[0074]
When the selection button B2 is pressed in step S24, the signal processing unit 13 changes the
frequency characteristic of the test signal using the correction filter F4, so that the sound with
the resonance phenomenon suppressed by the correction filter F4 is emitted from the earphone
120. Will be The listener L determines whether or not the desired sound quality is obtained
based on the sound emitted from the earphone 120, and presses the determination button B3
when the sound quality is desired.
[0075]
After accepting selection of the correction filter F4 in step S24, the selection unit 30 erases the
UI displayed on the display unit 31 (step S28) when the depression of the decision button B3 is
accepted (step S27; Yes). Finish.
[0076]
08-05-2019
22
FIG. 14 and FIG. 15 are diagrams for explaining the above-mentioned filter change processing.
In FIG. 14 and FIG. 15, the solid line represents the ear characteristic E of a certain listener L
wearing the earphone 120. As shown in FIG. 14, when the correction filter F4 is applied by the
signal processing unit 13 as the setting of sound quality correction, the resonance peak of the
ear characteristic E can not be efficiently suppressed, so the listener L depends on the resonance
phenomenon. You will hear the affected test sound. In this case, the listener L feels that the test
sound is loud or audible. On the other hand, as shown in FIG. 15, when the correction filter F1
capable of efficiently suppressing the resonance peak is applied in the signal processing unit 13,
the listener L can test the test sound in which the resonance phenomenon is reduced. I will listen.
In this case, the listener L receives a feeling that the loudness of the test sound is reduced or the
feeling of hearing on the ear is reduced compared to the case of FIG. It is possible to select the
correction filter on an intuitive basis of whether it is noisy or not, and whether it is difficult to
make such difficult judgments as listening preferences.
[0077]
As described above, the listener L changes the setting while comparing the sound quality of the
test signal subjected to the signal processing by each correction filter using the UI displayed on
the display unit 31 in the filter change processing. It is possible to select the correction filter on
an intuitive basis of whether it is noisy or not, and whether it is difficult to make such difficult
judgments as listening preferences. Further, as shown in FIG. 15, it is possible to easily select a
correction filter capable of efficiently suppressing the resonance peak of the ear characteristic E.
As a result, an appropriate correction filter is applied to the filter processing unit 50, so that the
listener L listens to the sound signal that has been corrected to match his own ear characteristics
via the earphone 120. It becomes possible to enjoy the sound quality that has been improved.
[0078]
As mentioned above, although embodiment of this invention was described, this invention is not
limited to this, A various change, substitution, addition, etc. in the range which does not deviate
from the main point of this invention are possible.
[0079]
08-05-2019
23
In the above embodiment, each correction filter is stored in advance as the setting related to the
correction of the acoustic signal (test signal), and the mode of changing the frequency
characteristic of the test signal using the correction filter has been described. I assume.
For example, only the values (cutoff frequency, Q value, etc.) representing the characteristics of
each correction filter may be held, and each correction filter may be generated each time using
these values.
[0080]
In the above embodiment, the correction is performed to suppress (reduce) the amplitude value
(resonance peak) of the acoustic signal using the correction filter. However, the present invention
is not limited to this. It may be For example, a component other than the frequency band in
which the resonance peak occurs may be increased, and correction may be performed such that
the frequency component that is the resonance peak does not protrude with respect to other
frequency band components.
[0081]
In the above embodiment, the band extraction unit 11 and the addition unit 12 are separately
provided. However, the present invention is not limited to this, and one process capable of
realizing functions in the band extraction unit 11 and the addition unit 12 It may be realized by a
part. Further, the functions of the band extracting unit 11, the adding unit 12, and the signal
processing unit 13 may be realized by one processing unit. In addition, when this configuration is
used, the number of times of signal processing to the acoustic signal (test signal) can be reduced
as compared with the configuration of FIG. 2, and since the circuit configuration can be
simplified, it is simpler. It is possible to show the same effect as the above-mentioned
embodiment by composition.
[0082]
In the above embodiment, the acoustic signal generation unit 40 generates a test signal, and the
band extraction unit 11 and the addition unit 12 amplify a component of a band in which
08-05-2019
24
resonance may occur due to the ear canal occlusion. However, it shall not be limited to this. For
example, as shown in FIG. 16, an acoustic signal equivalent to the test signal output from the
adding unit 12 is stored in advance in a storage medium, and a test signal is generated using the
acoustic signal stored in the storage medium. Alternatively, the listener L may be made to listen
as a test sound.
[0083]
Here, FIG. 16 is a diagram showing a configuration of a sound processing apparatus 200 which is
another form of the sound processing apparatus 100. As shown in FIG. As shown in the figure,
the sound processing device 200 is configured of a sound reproduction device 130
corresponding to the sound reproduction device 110 and an earphone 120. In the sound
reproducing apparatus 130, the configuration of the test signal generating unit 60 is different
from that of the sound reproducing apparatus 110, and a storage unit 61 storing an acoustic
signal equivalent to the test signal output from the adding unit 12; It is configured to have
[0084]
When the signal processing unit 62 reads out the acoustic signal stored in the storage unit 61,
the signal processing unit 62 performs processing for changing the frequency characteristic
using a correction filter corresponding to the selection signal from the selection unit 30, to the
acoustic signal. The signal is output to the conversion unit 20 as a signal.
[0085]
When the configuration of the sound processing apparatus 200 is used, the number of times of
processing the sound signal (test signal) can be reduced compared to the configuration of FIG. 2,
and the circuit configuration can be simplified. It is possible to show the same effect as the
above-mentioned embodiment by composition.
[0086]
Furthermore, in the configuration of the sound processing apparatus 200, a test signal processed
by each of the correction filters of the correction filters F1 to F4 may be stored in the storage
unit 61.
08-05-2019
25
In this case, the signal processing unit 62 reads from the storage unit 61 the acoustic signal
processed using the correction filter corresponding to the selection signal from the selection unit
30, and outputs the acoustic signal to the conversion unit 20 as a test signal. The same effect as
the above can be achieved.
[0087]
In the above embodiment, the signal processing unit 13 and the filter processing unit 50 are
separately provided. However, the present invention is not limited to this. As shown in FIG. 17,
the filter processing unit 80 corresponding to the filter processing unit 50 The test signal may be
generated using
[0088]
Here, FIG. 17 is a diagram showing a configuration of a sound processing apparatus 300 which is
another form of the sound processing apparatus 100. As shown in FIG.
As shown in the figure, the sound processing device 300 is configured of a sound reproduction
device 140 corresponding to the sound reproduction device 110 and an earphone 120.
In the sound reproducing apparatus 140, the configuration of the test signal generating unit 70
is different from that of the sound reproducing apparatus 110, and the signal processing unit 13
is removed from the test signal generating unit 10. Further, the filter processing unit 80
corresponding to the filter processing unit 50 receives the test signal from the adding unit 12,
and changes the frequency characteristic using the correction filter corresponding to the
selection signal from the selection unit 30. In the test signal generation unit 70, the band
extraction unit 11 and the addition unit 12 may be replaced with the storage unit 61 of FIG.
[0089]
When the configuration of the sound processing apparatus 300 is used, the circuit configuration
can be simplified as compared with the configuration of FIG. 2, and therefore, the same effect as
that of the above embodiment can be obtained with a simpler configuration.
[0090]
As described above, the audio signal correction apparatus and the audio signal correction method
08-05-2019
26
according to the present invention are useful for an audio processing apparatus that reproduces
an audio signal, and particularly suitable for an audio processing apparatus that emits sound
using earphones or headphones ing.
[0091]
DESCRIPTION OF SYMBOLS 100 Sound processing apparatus 110 Sound reproduction apparatus
120 Earphone 10 Test signal generation part 11 Band extraction part 12 Addition part 13 Signal
processing part 20 Conversion part 30 Selection part 31 Display part 32 Operation input part 40
Sound signal generation part 50 Filter processing part 200 Sound Processing device 130 sound
reproduction device 60 test signal generation unit 61 storage unit 62 signal processing unit 300
sound processing device 140 sound reproduction device 70 test signal generation unit 80 filter
processing unit
08-05-2019
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