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JP2015082701

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2015082701
The present invention provides a wireless microphone system and a microphone that can
perform voice correction processing corresponding to directivity characteristics and proximity
effect characteristics, improve voice performance, and realize voices that are easier to hear. The
wireless microphone system according to the present embodiment is a wireless microphone
system that transmits and receives voice input to the wireless microphone 10 by radio wave, and
an angle detection unit 13 that detects angle information of the wireless microphone 10; And an
audio processing unit that performs an audio signal correction process based on the detection
result of the unit. The sound processing unit 23 may further include a sound volume detection
unit 12 that detects the sound volume of the sound signal, and the sound processing unit 23 may
perform correction processing of the sound signal based on the detection result of the sound
volume detection unit 12 and the angle detection unit 13. [Selected figure] Figure 1
Wireless microphone system and microphone
[0001]
The present invention relates to a wireless microphone system and a microphone provided with a
detection device that detects angle information such as a gyroscope sensor.
[0002]
Wireless microphone systems are used in broadcast stations, schools, train stations, theaters and
the like.
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1
A wireless microphone is used as a loudspeaker and the user lets the listener listen to his / her
voice through the wireless microphone.
[0003]
The wireless microphone has directivity and proximity effect characteristics in the microphone
head unit that picks up sound. Therefore, the obtained frequency characteristics differ depending
on the angle and distance between the microphone and the sound source. That is, as shown in
FIG. 4, the sensitivity tends to decrease as the angle between the microphone and the sound
source increases, and as shown in FIG. 5, the sensitivity is enhanced in the low frequency region
as the sound source and the microphone approach. There is a tendency. Therefore, in order to
obtain desired characteristics, the user needs to be aware of these characteristics and input
speech.
[0004]
JP, 2001-912267, A
[0005]
However, the distance between the user's mouth and the microphone, the angle, etc. may not
always be constant.
For example, the user may unintentionally tilt the microphone, and the distance between the
microphone and the mouth gradually increases. In such a case, not only the performance of the
microphone can not be fully utilized, but also the sound quality is not constant, which makes it
difficult for the listener to hear.
[0006]
At present, in the above case, it can be coped with by correcting the sound with a sound
adjusting device (mixer) or the like, but this has been a burden to the operator of the mixer.
[0007]
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2
The present invention has been made to solve the above problems, and it is possible to perform
voice correction processing corresponding to directivity characteristics and proximity effect
characteristics, to improve voice performance, and to realize more audible voice. A microphone
system and a microphone are provided.
[0008]
The wireless microphone system of the present invention is a wireless microphone system that
transmits and receives voice input to a microphone by radio waves, and is characterized by
having the following configuration.
(1) An angle detection unit that detects angle information of the microphone.
(2) An audio processing unit that performs correction processing of an audio signal for the audio
based on a detection result by the angle detection unit.
[0009]
The audio processing unit may further include a sound volume detection unit that detects a
sound volume of the sound signal, and the sound processing unit may perform the correction
process of the sound signal based on detection results by the sound volume detection unit and
the angle detection unit.
[0010]
Further, according to the present invention, there is provided a microphone for converting an
input voice into a voice signal, and the correction of the voice signal based on the detection result
of the angle detection unit for detecting angle information of the microphone and the angle
detection unit. And a voice processing unit that performs processing.
The audio processing unit may further include a sound volume detection unit that detects a
sound volume of the sound signal, and the sound processing unit may perform the correction
process of the sound signal based on detection results by the sound volume detection unit and
the angle detection unit. .
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3
[0011]
According to the present invention, it is possible to obtain a wireless microphone system and a
microphone that can perform voice correction processing corresponding to directivity
characteristics and proximity effect characteristics, improve voice performance, and realize
voices that are easier to hear.
[0012]
BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the
wireless microphone system which concerns on 1st Embodiment.
(A) is a figure which shows the state before a microphone inclines, (b) is a figure which shows the
state which the microphone inclined. It is a flowchart which shows operation | movement of the
wireless microphone system which concerns on 1st Embodiment. It is a figure which shows an
example of the difference (directivity characteristic) of the frequency characteristic by the angle
between a microphone and a sound source. It is a figure which shows an example of the
difference (proximity effect characteristic) of the frequency characteristic by the distance of a
microphone and a sound source.
[0013]
Hereinafter, a wireless microphone system according to an embodiment of the present invention
will be described with reference to the drawings.
[0014]
[1.
First embodiment] [1-1. Configuration] FIG. 1 is a view showing the overall configuration of a
wireless microphone system according to the present embodiment. The present wireless
microphone system is used, for example, in a broadcasting station, a school, a station yard, a
theater, etc., detects the volume input to the microphone, and the posture and posture change of
the microphone, and based on these detection results, the volume and It performs change
01-05-2019
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correction processing of voice parameters such as sound quality. Such a wireless microphone
system includes a wireless microphone 10 that transmits a radio wave according to a voice input,
and a receiving device 20 that receives the radio wave.
[0015]
(Wireless Microphone 10) The wireless microphone 10 has a converter 11, a volume detector
12, and an angle detector 13. The converter 11, the volume detector 12, and the angle detector
13 are incorporated in the wireless microphone 10.
[0016]
The conversion unit 11 receives the sound wave emitted from the sound source and input to the
wireless microphone 10, and converts the sound wave into an audio signal which is an electrical
signal corresponding to the strength and frequency of the sound wave. As shown in FIG. 1, the
conversion unit 11 is connected to the sound volume detection unit 12 and an audio processing
unit 23 of the reception device 20 described later, and transmits the converted audio signal to
the sound volume detection unit 12 and the audio processing unit 23. Output.
[0017]
The sound volume detection unit 12 detects the sound volume based on the voltage of the input
audio signal. The volume detection unit 12 outputs the detected volume as a detection result to
the comparison determination unit 21 of the reception device 20. The detection of the sound
volume is continuously performed at predetermined time intervals. This time interval can be
changed as appropriate. Further, in the present embodiment, since the volume detector 12
detects the volume by the voltage of the input audio signal, it does not detect the change of the
frequency component.
[0018]
The angle detection unit 13 includes, for example, a detection device of angle information such
as a gyroscope sensor, and detects the angle of the wireless microphone 10 in use and its
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change. The angle information can include the angle of the wireless microphone 10 in use and /
or its change and / or angular velocity. In the present embodiment, the angle detection unit 13 is
an angle indicating how much the wireless microphone 10 is currently used with respect to the
reference angle, or when the user moves the wireless microphone 10, the current detection From
the used angle, an angle change indicating which direction and how much the angle changed to
which direction, and an angular velocity indicating how fast this angle change is performed are
detected.
[0019]
Here, the angle of the wireless microphone 10 means the central axis set on the wireless
microphone 10 and one point on the central axis (for example, the center of gravity of the
wireless microphone 10 or the central part of the microphone head of the wireless microphone
10) This is the angle between the line connecting the sound source and the sound source. The
reference angle is, for example, an angle when the sound source is on the central axis of the
wireless microphone 10 as shown in FIG. 2A, that is, when the angle of the wireless microphone
10 is 0 degrees. The posture of the wireless microphone 10 in such a state is referred to as a
reference posture. FIG. 2B shows the wireless microphone 10 tilted from the reference angle.
[0020]
Similar to the sound volume detection unit 12, the angle detection unit 13 continuously detects
an angle, an angle change, and an angular velocity at predetermined time intervals, and outputs
the detection result to the comparison determination unit 21 of the reception device 20. This
time interval can be changed as appropriate.
[0021]
(Receiving Device 20) The receiving device 20 includes a comparison determination unit 21, a
parameter storage unit 22 connected to the comparison determination unit 21, and an audio
processing unit 23 connected to the output side of the comparison determination unit 21. The
comparison and determination unit 21 includes a volume comparison and determination unit
21a and an angle comparison and determination unit 21b, compares the detection result
received from the wireless microphone 10 with various thresholds obtained from the parameter
storage unit 22, and corrects the audio signal. Determine the necessity of The determination
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result is output to the audio processing unit 23 as an audio correction processing signal
indicating the change degree of the audio parameter.
[0022]
The volume comparison and determination unit 21a has a storage unit (not shown), and
sequentially stores the detection results received from the volume detection unit 12 in the
storage unit. The volume comparison and determination unit 21a calculates the difference
between the received volume and the volume received immediately before this and stored in the
storage unit, and the magnitude of this volume change and the preset threshold of the volume
change. Compare Further, the volume comparison and determination unit 21a determines the
direction of the volume change based on the calculated volume change amount. As the direction
of the volume change, there are a direction in which the volume increases and a direction in
which the volume decreases.
[0023]
For example, when the volume emitted from the sound source is constant, when the wireless
microphone 10 moves from a reference posture as shown in FIG. 2A to an inclined posture as
shown in FIG. 2B, the wireless microphone As the distance between the sound source and 10
increases, the volume gradually decreases accordingly. The volume comparison and
determination unit 21a detects this change in volume and determines that the wireless
microphone 10 is moving in the direction of decreasing the volume, and in the opposite
relationship, moves in the direction of increasing the volume. judge.
[0024]
The angle comparison / determination unit 21 b compares the angle change amount detected by
the angle detection unit 13 with a preset threshold value of the angle change amount. If the
angle change amount exceeds the threshold value, it is determined that there is a possibility that
the audio signal correction process is required. If the angle change amount does not exceed the
threshold value, it is determined that the necessity is not required.
[0025]
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The angle comparison and determination unit 21b determines the direction of the change from
the change in angle detected by the angle detection unit 13. As the direction of angle change, a
direction in which the posture as shown in FIG. 2 (a) changes to a tilted posture as shown in FIG.
2 (b), ie, a direction away from the reference posture and the reverse standard. There is a
direction that approaches the posture.
[0026]
Based on the angular velocity detected by the angle detection unit 13, the angle comparison
determination unit 21b determines whether or not the change in the posture of the wireless
microphone 10 is intentional by the user. That is, the angle comparison / determination unit 21 b
compares the angular velocity detected by the angle detection unit 13 with the threshold of the
angular velocity set in advance. If the detected angular velocity is larger than the threshold, it is
determined that the user of the wireless microphone 10 intentionally changes the posture, and if
the angular velocity is smaller than the threshold, the user of the wireless microphone 10
unintentionally wirelessly It is determined that the attitude of the microphone 10 has changed,
and it is determined that there is a possibility that the correction process of the audio signal is
required.
[0027]
The comparison determination unit 21 determines whether the change direction of the volume
and the change direction of the angle match, based on the information obtained by the volume
comparison determination unit 21a and the angle comparison determination unit 21b. If the
change direction of the volume and the angle coincide with each other, it is determined that the
audio signal may need to be corrected. If not, it is determined that the necessity does not exist.
[0028]
When the change direction of the volume and the change direction of the angle match, the
volume decreases and the posture is inclined, and the microphone moves away from the sound
source, and the volume increases and approaches the reference posture and the microphone
approaches the sound source. Say. When the change direction of the sound volume and the
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change direction of the angle do not match, the cases where the sound volume is reduced and the
posture is correct, and the sound volume is increased and the posture is inclined.
[0029]
As described above, the comparison / determination unit 21 uses the volume change amount, the
angle change amount, the angular velocity, and the match between the volume and the change
direction of the angle as a determination material of the necessity of the correction process of the
audio signal. When it is determined that there is a need for correction processing in step (4), it is
determined that correction processing of the audio signal is necessary. If there is no need for
correction processing in any of the judgment materials, it is determined that correction
processing is unnecessary.
[0030]
The parameter storage unit 22 stores in advance a volume change amount, an angle change
amount, and an angular velocity threshold. The comparison / determination unit 21 acquires
various threshold values to be compared with the detection results from the parameter storage
unit 22. A plurality of these respective thresholds may be stored in the parameter storage unit 22
in accordance with the movement of the wireless microphone 10 of the user. As a result, it is
possible to determine the necessity of the correction processing appropriately according to the
pattern of the movement of the user.
[0031]
In addition, the parameter storage unit 22 stores in advance the degree of change in audio
parameters (volume, frequency characteristics, etc.) in association with the detection results of
the volume detection unit 12 and the angle detection unit 13 and the audio correction
processing. . That is, since the wireless microphone 10 has unique directional characteristics and
proximity effect characteristics, the degree of change of the voice parameter according to the
change of the volume and angle is determined in advance at the time of design. For example, a
table of the degree of change in which the vertical axis is the volume change amount and the
horizontal axis is the angle change amount is created in advance and stored. The degree of
correction can be set as appropriate. Further, since the directivity characteristics and the
proximity effect characteristics are different for each wireless microphone 10, the plurality of
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wireless microphones 10 can be appropriately set.
[0032]
As described above, the volume change amount, the angle change amount, the angular velocity,
and the change degree of the voice parameter are stored in association with each other.
Therefore, when the comparison and determination unit 21 determines that the correction
process of the audio signal is necessary, it is possible to determine the change degree of the
audio parameter according to the detection result. The comparison / determination unit 21
acquires information on the degree of change of the audio parameter according to the detection
result from the parameter storage unit 22, and outputs an audio correction processing signal
having this information to the audio processing unit 23. The voice correction processing signal is
a control signal of the voice processing unit 23.
[0033]
The voice processing unit 23 includes a volume change unit 23a and a sound quality change unit
23b, and based on the voice correction processing signal from the comparison determination
unit 21, the voice signal received from the wireless microphone 10 is converted into voice
parameters in real time. Perform processing to change. The audio processing unit 23 can be
configured by, for example, an analog audio processing circuit using an amplifier or the like, or a
digital processor.
[0034]
That is, the volume changer 23a changes the volume of the input audio signal based on the audio
correction processing signal from the comparison determination unit 21. The sound quality
changing unit 23 b is an equalizer, and changes the sound quality (frequency characteristic) of
the input sound signal based on the sound correction processing signal from the comparison and
determination unit 21. The audio processing unit 23 outputs an audio signal whose volume and
sound quality have been changed to the outside of the wireless microphone system.
[0035]
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10
[1−2. Operation] As an example of the situation where the voice correction processing is
performed in this wireless microphone system, a scene where the distance between the
microphone and the user's mouth gradually separates in a situation not intended by the user of
the microphone It is assumed. This is a situation in which the attitude shown in FIG. 2 (a)
changes to the attitude shown in FIG. 2 (b). In such a situation, the speed of the microphone
posture change is slow. On the contrary, when the microphone is intentionally removed from the
mouth as the sound source, the change speed of the posture becomes faster.
[0036]
The operation of the wireless microphone system of this embodiment will be described below
with reference to FIG. FIG. 3 is a flowchart showing an example of the operation of the wireless
microphone system. Note that the order of operations of the flowchart in FIG. 3 is an example,
and the present invention is not necessarily limited to this order.
[0037]
As shown in FIG. 3, first, when the wireless microphone 10 is activated (step S01), the volume
detector 12 and the angle detector 13 input the volume of the wireless microphone 10, the angle
of the wireless microphone 10, and the change in the angle, And angular velocity is detected
(step S02). These detection results are output to the comparison determination unit 21 (step
S03). Thereafter, the above detection and the output of the detection result are performed until
the wireless microphone 10 is stopped.
[0038]
Here, the comparison and determination unit 21 determines whether or not the audio signal
correction process is necessary. That is, first, the comparison and determination unit 21 acquires,
from the parameter storage unit 22, a threshold necessary for comparison in the angle
comparison and determination unit 21b and the volume comparison and determination unit 21a
(step S04).
[0039]
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11
Next, the angle comparison / determination unit 21b compares the amount of angle change with
the threshold of the amount of angle change, and determines whether the amount of angle
change exceeds the threshold (step S05). If the angle change amount exceeds the threshold (Yes
in step S05), the angle comparison determination unit 21b compares the angular velocity with
the threshold of the angular velocity, and determines whether the angular velocity is within the
threshold (step S06). If the angular velocity is within the threshold (Yes in step S06), the
comparison determination unit 21 determines whether the change direction of the volume and
the change direction of the angle match (step S07).
[0040]
If the change directions match (Yes in step S07), the volume change amount is calculated by
calculating the difference between the volume input from the volume detection unit 12 and the
volume input immediately before being stored in the storage unit (step S08). The volume
comparison and determination unit 21a compares the magnitude of the determined volume
change with the threshold of the magnitude of the volume change, and determines whether the
volume change exceeds the threshold (step S09).
[0041]
When the volume change exceeds the threshold (Yes in step S09), the comparison determination
unit 21 determines that the voice correction process is necessary, and acquires a voice correction
parameter according to the detection result from the parameter storage unit 22 (step S10), An
audio correction processing signal based on this parameter is output to the audio processing unit
23 (step S11). The voice processing unit 23 executes a voice signal correction process based on
the voice correction process signal (step S12).
[0042]
On the other hand, when the angle change amount does not exceed the threshold (No in step
S05), when the angular velocity exceeds the threshold (No in step S06), when the change
directions do not match (No in step S07), and the volume change is the threshold If it does not
exceed (No at step S09), it is determined that the voice correction process is unnecessary, and
neither the output of the voice correction processing signal nor the voice correction process is
performed, and the process returns to step S05.
01-05-2019
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[0043]
As described above, in the present embodiment, the determination accuracy is improved by
performing the multi-step determination as in steps S05 to S07 and S09 to determine the
necessity of the voice correction process.
That is, when the angle change amount does not exceed the predetermined threshold value, the
correction process is not necessary at all. If the angle change amount exceeds the predetermined
threshold value, correction processing may be necessary, but it is unclear whether the angle
change reflects the user's intention. Therefore, in the present embodiment, the angular velocity is
usually monitored by focusing attention on the point that it is considered that the posture of the
wireless microphone 10 is intended to be changed quickly when it is intentionally changed.
Thereby, it can be determined whether or not the change in posture is intended by the user. By
monitoring the consistency between the angle and the change direction of the sound volume, it is
determined whether or not the frequency characteristic has largely changed, and this is used as
an index of the necessity of the correction process. In addition, by monitoring the change in
volume, it is possible to improve the determination accuracy of necessity of the correction
process.
[0044]
[1−3. Effects] (1) The wireless microphone system of the present embodiment is a wireless
microphone system that transmits and receives voice input to the wireless microphone 10 by
radio wave, and the angle detection unit 13 that detects the angle and angular velocity of the
wireless microphone 10; And an audio processing unit that performs an audio signal correction
process based on the detection result of the angle detection unit. As a result, since the frequency
characteristic correction process is performed according to the posture change of the wireless
microphone 10, the audio performance is improved, and a voice that is easier to hear can be
realized.
[0045]
(2) The audio processing unit 23 further includes a volume detection unit 12 that detects the
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13
volume of the audio signal, and the audio processing unit 23 performs correction processing of
the audio signal based on the detection result by the volume detection unit 12 and the angle
detection unit 13 . As a result, the correction process is performed not only on the frequency
characteristics according to the posture change of the wireless microphone 10 but also on the
volume, so that the quality of the voice is improved, and a voice that is easier to hear can be
realized.
[0046]
(3) The audio processing unit 23 further includes the parameter storage unit 22 storing the
correction degree corresponding to the detection result of the volume detection unit 12 and the
angle detection unit 13 detected in advance. The audio signal correction processing is performed
based on the correction degree corresponding to the detection result of the detection unit 13.
Thereby, the effectiveness of the correction can be adjusted according to the user. Further, since
the correction processing is automatically performed based on the detection result, it is possible
to eliminate the burden of the operator performing the sound correction processing by the mixer.
[0047]
(4) A comparison determination unit 21 is further provided which determines the necessity of
the correction processing of the audio signal by comparing the detection results of the sound
volume detection unit 12 and the angle detection unit 13 with various threshold values which
are comparison references set in advance. I did it. As a result, since the correction processing of
the audio signal is performed only when the correction processing is necessary, unnecessary
processing can be prevented.
[0048]
(5) The comparison determination unit 21 determines whether or not the audio signal correction
process is necessary based on the amount of change in the angle detected by the angle detection
unit 13. That is, if the detected angle change amount exceeds the predetermined threshold, it is
determined that the audio signal correction processing may be required, and if the detected angle
does not exceed the predetermined threshold, the correction is performed in the first place. Since
there is no need for processing, it is determined that correction processing is unnecessary. This
01-05-2019
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can prevent unnecessary processing.
[0049]
(6) The comparison and determination unit 21 determines whether or not the audio signal
correction process is necessary based on the angular velocity detected by the angle detection
unit 13. That is, the determination is made based on the comparison between the angular
velocity detected by the angle detection unit 13 and a predetermined threshold. In this way, it is
possible to determine whether the change in the attitude of the wireless microphone 10 is
intended by the user or unintended and unintended. In the case of an unintended posture
change, the picked up sound volume and the frequency characteristic are unintentionally
changed by the directivity characteristic and the proximity effect characteristic, but the change
can be corrected. Moreover, the accuracy of the necessity determination of correction processing
can be improved by making a determination from two viewpoints of the angle change amount
and the angular velocity.
[0050]
(7) The comparison and determination unit 21 determines the necessity of the correction process
of the audio signal based on the coincidence between the angle and the change direction of the
sound volume. As a result, when the change directions coincide with each other, that is, when the
frequency characteristics greatly change, it can be determined that the correction process is
necessary, so that the accuracy of the necessity determination of the correction process can be
improved.
[0051]
[2. Other Embodiments] (1) In the first embodiment, the audio processor 23 is provided in
the receiving device 20, but may be incorporated in a microphone. For example, in this case, the
audio processing unit can be configured as an internal circuit of the microphone.
[0052]
01-05-2019
15
(2) In the first embodiment, the degree of correction of the voice parameter is changed according
to the detection result, so that the degree of correction is different if the detection result is
different, for example, the angle change amount is If correction processing is necessary, for
example, if it exceeds the predetermined threshold or if the angular velocity is within the
predetermined threshold, the frequency characteristics are corrected uniformly so as to have the
same frequency characteristics as the attitude of the predetermined angle. It is good. The posture
of the predetermined angle is not particularly limited, and for example, a reference posture of an
angle of 0 ° can be mentioned. By doing this, it is possible to realize voice of a certain quality.
[0053]
(3) When the amount of change in angle exceeds the threshold, the frequency characteristic at an
angle closer to the reference posture by a predetermined angle may be corrected.
[0054]
(4) In the first embodiment, the comparison / determination unit 21 uses the volume change
amount, the angle change amount, the angular velocity, and the coincidence between the volume
and the change direction of the angle as a determination criterion of necessity of correction
processing of the audio signal, When it is determined that all of the determination criteria require
the correction process, it is determined that the audio signal correction process is necessary.
However, at least one or more determination criteria are selected from these determination
criteria, and the selection is made. When it is determined that all the determination criteria need
to be corrected, the correction process of the audio signal may be determined.
[0055]
(5) In the first embodiment, the sound volume is detected by the sound volume detection unit 12
and the sound volume change is monitored by the sound volume comparison and determination
unit 21a. However, the configurations of the sound volume detection unit 12 and the sound
volume comparison and determination unit 21a are If not, it is within the scope of the present
invention.
[0056]
10 wireless microphone 11 conversion unit 12 volume detection unit 13 angle detection unit 20
reception device 21 comparison determination unit 21a volume comparison determination unit
21b angle comparison determination unit 22 parameter storage unit 23 audio processing unit
23a volume change unit 23b sound quality change unit
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