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DESCRIPTION JP2008278003

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DESCRIPTION JP2008278003
The present invention provides an audio signal processing apparatus which can suitably use a
microphone for vocals and speech. An audio signal processing apparatus 1 is an apparatus for
mixing and outputting an audio signal and a microphone signal, and a microphone signal
adjustment unit 13 for adjusting at least one of volume and sound quality of the microphone
signal, and presence or absence of an audio signal And an audio signal detection unit 11 for
detecting the The microphone signal adjustment unit 13 is a vocal adjustment unit 61 in which a
vocal adjustment characteristic suitable for using the microphone 23 for vocals and a speech in
which a speech adjustment characteristic suitable for using the microphone 23 for speech is set
An adjustment unit 63 is provided, and switching to the vocal adjustment unit 61 or the speech
adjustment unit 63 according to the presence or absence of the audio signal. [Selected figure]
Figure 1
Audio signal processing device
[0001]
The present invention relates to an audio signal processing apparatus that mixes and outputs an
audio signal and a microphone signal.
[0002]
Conventionally, an audio signal processing apparatus called a mixer is used in various facilities
such as a banquet hall.
10-04-2019
1
The mixer is connected to the sound source device and the microphone. The sound source device
is a performance device or the like, and inputs an audio signal (sound signal of performance) to
the mixer. Also, a microphone signal (audio signal generated by the microphone) is input to the
mixer from the microphone. Then, the mixer mixes the audio signal and the microphone signal
and outputs the mixed signal to an amplifier or the like.
[0003]
Also, conventionally, in this type of audio signal processing apparatus, a technique has been
proposed for detecting the presence or absence of an audio signal and blocking the input of the
microphone signal to the mixer amplifier when there is no audio signal. According to this prior
art, it is possible to eliminate the manual operation of turning off the microphone power when
the performance is over (see Patent Document 1). JP-A-8-33089
[0004]
However, although the conventional audio signal processing apparatus saves time and effort to
turn off the microphone power when the performance is over, there is a problem that it can not
cope with the case where the same microphone is used after the performance.
[0005]
In order to cope with the speech after the performance, it is also conceivable to continue to input
the microphone signal to the mixer amplifier regardless of the presence or absence of the audio
signal.
However, if you use the microphone you used for vocals as it is for speech, the volume may be
insufficient or howling may occur, and you may not hear the speech well.
[0006]
The present invention has been made to solve the conventional problems, and it is an object of
the present invention to provide an audio signal processing apparatus which can suitably use a
microphone for vocals and speech.
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2
[0007]
The audio signal processing apparatus according to the present invention is an apparatus for
mixing and outputting an audio signal and a microphone signal, and a microphone signal
adjustment unit for adjusting at least one of volume and sound quality of the microphone signal,
and presence or absence of the audio signal And an audio signal detection unit for detecting the
microphone signal adjustment unit, the microphone signal adjustment unit being suitable for
using the microphone as a vocal adjustment unit in which a vocal adjustment characteristic
suitable for using the microphone as a vocal is set, and the microphone A speech adjustment unit
in which the speech adjustment characteristic is set, and an adjustment characteristic switching
unit for switching to the vocal adjustment unit or the speech adjustment unit according to the
presence or absence of the audio signal.
[0008]
With this configuration, the presence or absence of an audio signal is detected, and the
adjustment characteristic of the microphone signal adjustment unit is switched between the vocal
adjustment characteristic and the speech adjustment characteristic according to the presence or
absence of the audio signal.
As a result, the microphone signal can be adjusted according to the vocal adjustment
characteristic during performance, and the microphone signal can be automatically adjusted
according to the speech adjustment characteristic when the performance is finished, so that the
microphone can be suitably used for vocals and speech.
[0009]
In the audio signal processing device according to the present invention, the microphone signal
adjustment unit adjusts the volume of the microphone signal, and the vocal adjustment
characteristic and the speech adjustment characteristic are different in volume adjustment
amount, and the speech adjustment characteristic is The volume adjustment amount is a value
obtained by adding a difference amount that compensates for the voice amount difference
between the vocal and the speech to the volume adjustment amount of the vocal adjustment
characteristic.
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With this configuration, it is possible to increase the volume when using speech more than when
using vocals, and to avoid the volume shortage in speech. Thus, the same microphone can be
used after vocals to make the speech more audible.
[0010]
Further, in the audio signal processing device according to the present invention, the microphone
signal adjustment unit adjusts the sound quality of the microphone signal, and the vocal
adjustment characteristic and the speech adjustment characteristic differ in frequency
characteristics for adjusting the sound quality. In the speech adjustment characteristic, frequency
components unnecessary for speech use are suppressed with respect to the frequency
characteristic of the vocal adjustment characteristic. This configuration focuses on the fact that
the frequency band required for speech usage is narrower than for vocal usage. Based on this
point, howling can be reduced by suppressing unnecessary frequency components when using
speech.
[0011]
The audio signal processing apparatus according to the present invention further includes an
echo processing unit that generates an echo signal, the echo processing unit including an echo
signal generation unit that generates the echo signal, and an input side of the echo signal
generation unit. And an echo input switching unit for switching whether or not the microphone
signal is input to the echo signal generation unit according to the presence or absence of the
audio signal.
[0012]
With this configuration, echo on / off can also be switched automatically.
Conventionally, the echo output is muted, whereas in the present invention the echo input is
muted. Thereby, echo processing of the microphone signal already input at the switching time is
continued to the end. Therefore, it is possible to prevent the echo from being unnaturally cut off
suddenly, and to make the break of the echo natural.
[0013]
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The audio signal processing apparatus according to the present invention further includes an
audio volume adjustment unit that adjusts the volume of the audio signal, and the audio signal
detection unit may change the volume of the signal output from the audio volume adjustment
unit. Detect the presence or absence of an audio signal.
[0014]
With this configuration, the presence or absence of the audio signal is detected based on the
presence or absence of the volume in the signal output from the audio volume adjustment unit.
As a result, the microphone can be suitably used for speech not only when the performance is
finished and the audio input is finished but also when the audio volume adjuster reduces the
volume. For example, even when speech is suddenly required in the middle of a performance, the
microphone can be suitably used for speech automatically by reducing the volume by the audio
volume adjustment unit.
[0015]
The audio signal processing apparatus according to the present invention further includes a
manual operation unit for manually switching the vocal adjustment characteristic and the speech
adjustment characteristic in the adjustment characteristic switching unit. With this configuration,
when it is desired to use the microphone for vocals without playing, for example, in the case of a
cappella, the microphone can be suitably used for vocals.
[0016]
Another aspect of the present invention is an audio signal processing method of mixing and
outputting an audio signal and a microphone signal, detecting the presence or absence of the
audio signal, and according to the detection result of the presence or absence of the audio signal,
A microphone signal adjustment process for adjusting at least one of volume and sound quality
in a microphone signal is performed, and in the microphone signal adjustment process, vocal
adjustment characteristics suitable for using the microphone for vocals and the microphone for
using the microphone for speech A suitable speech adjustment characteristic is set, and switching
to the vocal adjustment characteristic or the speech adjustment characteristic is made according
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5
to the presence or absence of the audio signal. This method also provides the advantages of the
invention described above.
[0017]
According to the present invention, the microphone can be suitably used for vocals and speech
by providing a configuration for switching the adjustment characteristic of the microphone signal
adjustment unit between the vocal adjustment characteristic and the speech adjustment
characteristic according to the presence or absence of the audio signal. An audio signal
processing device having an effect can be provided.
[0018]
Hereinafter, an audio signal processing apparatus according to an embodiment of the present
invention will be described using the drawings.
[0019]
An audio signal processing apparatus according to an embodiment of the present invention is
shown in FIG.
The audio signal processing apparatus 1 is an apparatus that roughly mixes an audio signal and a
microphone signal and outputs the mixed signal, and is, for example, a mixer apparatus provided
in facilities such as a banquet hall.
The audio signal is an audio signal of a performance, and the microphone signal is an audio
signal input from the microphone.
[0020]
In FIG. 1, the audio signal processing device 1 includes audio input terminals 3 and 3 on the L
side and R side to which audio signals are input, a microphone input terminal 5 to which
microphone signals are input, and input audio signals and microphone signals. It comprises a
mixing unit 7 for mixing, and L-side and R-side output terminals 9 and 9 for outputting the audio
signal mixed by the mixing unit 7. Furthermore, the audio signal processing device 1 includes an
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6
audio signal detection unit 11 that detects the presence or absence of an audio signal, a
microphone signal adjustment unit 13 that adjusts the volume and sound quality of the
microphone signal, and an echo processing unit that generates an echo signal from the
microphone signal. And a manual operation unit 17 for manually switching the characteristics of
the microphone signal adjustment unit 13. In the above configuration, the configuration such as
the audio signal detection unit 11, the microphone signal adjustment unit 13, and the echo
processing unit 15 may be configured by a DSP (digital signal processor) together with the
mixing unit 7.
[0021]
A performance device 21 is connected to the audio input terminals 3 and 3, and an audio signal
is input from the performance device 21. A sound source device other than the performance
device 21 may be connected, and for example, an audio reproduction device such as a CD player
may be connected. A microphone 23 is connected to the microphone input terminal 5, and a
microphone signal is input from the microphone 23. The microphone 23 may be of a wireless
type, and a microphone signal may be input via a wireless transceiver. Further, although not
shown, a speaker is connected to the output terminals 9 and 9 via an amplifier. Of course, an
amplifier built-in speaker may be connected to the output terminals 9, 9.
[0022]
Further, an audio signal amplifier 31 and an audio volume adjustment unit 33 are disposed
between the audio input terminals 3 and 3 and the mixing unit 7. The audio volume adjustment
unit 33 supplies an audio signal to the mixing unit 7 and the audio signal detection unit 11.
[0023]
The audio signal detection unit 11 includes a MIX unit 41, a detector 43, and a switch 45. The
MIX unit 41 is an adder, and adds the L side and R side audio signals. The detector 43 detects the
audio signal after addition. The detector 43 may detect an audio signal when the volume level of
the audio signal is equal to or higher than a predetermined threshold. The switch 45 is used for
manual / automatic switching as described later. The detection result of the presence or absence
of the audio signal is supplied from the detector 43 to the microphone signal adjustment unit 13
and the echo processing unit 15 via the switch 45.
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[0024]
A microphone signal amplifier 51, a microphone volume adjustment unit 53 and a microphone
signal adjustment unit 13 are disposed between the microphone input terminal 5 and the mixing
unit 7, and from the microphone signal adjustment unit 13 to the mixing unit 7 and the echo
processing unit 15, The adjusted microphone signal is supplied. A howling suppression unit 55
(digital howling suppressor) may be further provided between the microphone signal adjustment
unit 13 and the mixing unit 7 as indicated by a dotted line in the drawing.
[0025]
The microphone signal adjustment unit 13 is configured to adjust the volume and sound quality
of the microphone signal, and includes a vocal adjustment unit 61, a speech adjustment unit 63,
a first switching unit 65, and a second switching unit 67.
[0026]
Vocal adjustment characteristics are set in the vocal adjustment unit 61.
The vocal adjustment characteristic is a characteristic suitable for utilizing the microphone 23 for
vocals. More specifically, the vocal adjustment unit 61 includes a vocal equalizer 71 and a vocal
volume adjustment unit 73. Among these, the sound quality is adjusted by the frequency
characteristic control function of the equalizer. The frequency characteristics of the vocal
equalizer 71 and the volume of the vocal volume adjuster 73 are set appropriately for use of the
microphone 23 vocals.
[0027]
Similarly, in the speech adjustment unit 63, speech adjustment characteristics are set. The speech
adjustment characteristic is a characteristic suitable for utilizing the microphone 23 for speech.
The speech adjustment unit 63 has a speech equalizer 75 and a speech volume adjustment unit
77, and the frequency characteristics of the speech equalizer 75 and the volume of the speech
volume adjustment unit 77 are set appropriately for use of the speech of the microphone 23. .
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8
[0028]
The above-mentioned vocal adjustment characteristic and speech adjustment characteristic are
preset using a preset function. These adjustment characteristics may be set at the time of
manufacture or may be set by user operation.
[0029]
Referring now to FIG. 2, a preferred example of vocal and speech adjustment characteristics will
be described. In FIG. 2, the horizontal axis is frequency, the vertical axis is volume, and the vocal
adjustment characteristic and the speech adjustment characteristic are indicated by the
relationship between frequency and volume.
[0030]
First, to describe the volume setting, as shown in the drawing, the line of the speech adjustment
characteristic is higher than the vocal adjustment characteristic in the main bands excluding the
high-tone and low-tone bands. Thus, regarding the volume, it is preferable to make the volume
adjustment of speech larger than the volume adjustment of vocals.
[0031]
To further explain the volume setting, there is generally a voice volume difference (difference in
voice volume) between speech and vocal, and the voice input (speaker's voice) is smaller than the
vocal voice (singer's voice) as the microphone input volume. There is a trend. Therefore, if the
volume adjustment amount is the same at the time of vocal and speech, the volume of the speech
(speaker output) may be reduced, and the speech may not be heard well. Taking this into
consideration, the volume adjustment amount of the speech adjustment characteristic is set to a
value obtained by adding the difference amount to compensate for the voice volume difference
between the vocal and the speech to the volume adjustment amount of the vocal adjustment
characteristic. The speech volume adjustment setting is greater than the vocal volume adjustment
setting.
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[0032]
In an actual system, the volume of vocal and speech may be adjusted on site, and as a result, the
amount of vocal volume adjustment and the amount of speech volume adjustment may be set
differently by a difference amount that compensates for the above-mentioned voice amount
difference. Also, the difference in voice volume between standard vocal and speech may be
determined from statistical values and the like, and the difference may be calculated from the
difference in voice volume.
[0033]
Next, setting of the sound quality will be described. Sound quality is represented by a frequency
characteristic that is a change in volume according to the frequency. As shown in FIG. 2, in the
vocal adjustment characteristic, the frequency specification is almost flat in the whole region. On
the other hand, in the speech adjustment characteristic, the band is narrower than the vocal
adjustment characteristic, and the frequency components of the high tone side and the low tone
side band are suppressed. These suppression bands are necessary to enrich the expression at the
time of vocals, but are unnecessary at the time of speech, where bands unnecessary for speech
are suppressed. By thus suppressing the unnecessary band components, the occurrence
probability of howling can be reduced and the howling at the time of speech can be reduced.
[0034]
The vocal adjustment characteristic and the speech adjustment characteristic have been
described above. These characteristics are realized by the vocal adjustment unit 61 and the
speech adjustment unit 63 of the microphone signal adjustment unit 13 of FIG. 1 as described
above. The frequency characteristic of the vocal equalizer 71 in the vocal adjustment unit 61 and
the volume adjustment amount of the vocal volume adjustment unit 73 are set together to realize
the vocal adjustment characteristic of FIG. 2, and similarly, the speech in the speech adjustment
unit 63 The frequency characteristic of the equalizer 75 and the volume adjustment amount of
the speech volume adjustment unit 77 are set together to realize the speech adjustment
characteristic of FIG.
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10
[0035]
Further, in FIG. 1, the first switching unit 65 and the second switching unit 67 are provided on
the input side and the output side of the microphone signal adjustment unit 13 and these
function as the adjustment characteristic switching unit, and the presence or absence of the
audio signal Switching between the vocal adjustment characteristic and the speech adjustment
characteristic according to Although each of the first switching unit 65 and the second switching
unit 67 is conceptually illustrated as a relay and a switch in the drawing, in an actual
configuration, the first switching unit 65 and the second switching unit 67 are realized by a DSP.
(The same applies to the echo switching unit described later).
[0036]
A detection result of the presence or absence of an audio signal is input from the audio signal
detection unit 11 to the relay units of the first switching unit 65 and the second switching unit
67. When the audio signal is present, the first switching unit 65 and the second switching unit
67 cause the vocal adjustment unit 61 to process the microphone signal. When there is no audio
signal, the first switching unit 65 and the second switching unit 67 cause the speech adjustment
unit 63 to process the microphone signal.
[0037]
Next, the echo processing unit 15 will be described. The echo processing unit 15 includes an
echo signal generation unit 81, an echo volume adjustment unit 83, and an echo input switching
unit 85. The echo signal generation unit 81 generates an echo signal by delaying the microphone
signal. The echo volume adjustment unit 83 adjusts the volume of the echo signal. Then, the
adjusted echo signal is supplied to the mixing unit 7 and mixed with the audio signal and the
microphone signal.
[0038]
The echo input switching unit 85 is configured to switch on / off of the echo function. The echo
input switching unit 85 is provided on the input side of the echo signal generation unit 81, and
switches whether to input a microphone signal to the echo signal generation unit 81 according to
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11
the presence or absence of the audio signal. Similar to the first switching unit 65 and the second
switching unit 67, the echo input switching unit 85 conceptually includes a relay and a switch.
Then, the detection result of the presence or absence of the audio signal is input from the audio
signal detection unit 11 to the relay unit. When an audio signal is present, the echo input
switching unit 85 inputs a microphone signal to the echo signal generation unit 81. When there
is no audio signal, the echo input switching unit 85 performs switching operation so that the
microphone signal is not input to the echo signal generation unit 81.
[0039]
Next, the manual operation unit 17 will be described. The manual operation unit 17 is configured
to manually switch the characteristic switching in the microphone signal adjustment unit 13 and
the on / off of the echo in the echo processing unit 15. When the manual operation unit 17 is
operated, the switch 45 is switched to the manual side. Then, by operating the manual operation
unit 17, the operation signal is supplied to the first switching unit 65 and the second switching
unit 67 of the microphone signal adjustment unit 13, and the adjustment characteristic can be
switched regardless of the presence or absence of the audio signal. it can. In addition, the
operation signal is also input to the echo input switching unit 85 of the echo processing unit 15,
and the on / off of the echo can be switched regardless of the presence or absence of the audio
signal.
[0040]
The configuration of the audio signal processing device 1 according to the present embodiment
has been described above. Next, the operation of the audio signal processing device 1 will be
described. First, the operation when there is an audio signal will be described. Here, it is assumed
that the switch 45 is set to the automatic side.
[0041]
When an audio signal is input from the performance device 21 and the volume is not reduced by
the audio volume adjustment unit 33, the audio signal is input to the audio signal detection unit
11 and the detector 43 via the MIX unit 41. , And an audio signal is detected by the detector 43.
Then, “audio signal present” is transmitted to the microphone signal adjustment unit 13 and
the echo processing unit 15.
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[0042]
In the microphone signal adjustment unit 13, information with audio is supplied to the first
switching unit 65 and the second switching unit 67, and the first switching unit 65 and the
second switching unit 67 process the microphone signal in the vocal adjustment unit 61. Let This
processes the microphone signal with the vocal adjustment characteristic. That is, the
microphone signal is processed by the vocal equalizer 71 with frequency characteristics suitable
for vocals, and the microphone volume is further processed by the vocal volume adjuster 73 with
volume settings suitable for vocals. The adjusted microphone signal is supplied to the mixing unit
7 and the echo processing unit 15.
[0043]
In the echo processing unit 15, information on the presence of an audio signal is input to the
echo input switching unit 85, and the echo input switching unit 85 causes a microphone signal to
be input to the echo signal generation unit 81. The echo signal generation unit 81 generates an
echo signal by delay processing, the volume of the echo signal is adjusted by the echo volume
adjustment unit 83, and the adjusted echo signal is supplied to the mixing unit 7.
[0044]
The mixing unit 7 mixes the audio signal, the microphone signal and the echo signal, and the
mixed audio signal is output from the output terminals 9 and 9 to the speaker. Thus, when an
audio signal is detected, the microphone signal is processed according to the vocal adjustment
characteristics suitable for vocals, and an echo is also applied.
[0045]
Next, the operation when there is no audio signal will be described. Also here, the switch 45 is set
to the automatic side.
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13
[0046]
It is assumed that the performance on the performance device 21 ends and the input of the audio
signal stops. Further, it is assumed that the audio signal is input but the audio volume adjustment
unit 33 reduces the volume. In these cases, the audio signal is not detected by the audio signal
detector 11, and "no audio signal" is transmitted to the microphone signal adjuster 13 and the
echo processor 15.
[0047]
In the microphone signal adjustment unit 13, the information without audio is supplied to the
first switching unit 65 and the second switching unit 67, and the first switching unit 65 and the
second switching unit 67 process the microphone signal in the speech adjustment unit 63.
Switching operation to process the microphone signal according to the speech adjustment
characteristic. That is, the microphone signal is processed with the frequency characteristic
suitable for speech in the speech equalizer 75, and the microphone signal is further processed in
the volume setting suitable for speech in the speech volume adjustment unit 77. As shown in FIG.
2, in the speech adjustment characteristic, frequency components unnecessary for speech are
suppressed to reduce howling. Also, in consideration of the tendency of the speech voice to be
smaller than that of the vocal, the volume setting is increased in the speech adjustment
characteristic, and the speech volume deficiency is avoided. The adjusted microphone signal is
supplied to the mixing unit 7 and the echo processing unit 15.
[0048]
In the echo processing unit 15, the information indicating no audio signal is input to the echo
input switching unit 85, and the echo input switching unit 85 performs switching operation so as
not to input the microphone signal to the echo signal generating unit 81.
[0049]
Therefore, when there is no audio signal, an echo signal is not generated and is not input to the
mixing unit 7.
An audio signal is also not input to the mixing unit 7. The mixing unit 7 outputs only the
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microphone signal to the output terminals 9 and 9. Thus, when no audio signal is detected, the
echo is turned off and only the microphone signal processed according to the speech adjustment
characteristic is output.
[0050]
In the above operation, when the audio signal presence state is switched to the audio signal
absence state, the echo processing unit 15 operates as follows. In the echo processing unit 15, an
echo input switching unit 85 is disposed on the input side. Therefore, the microphone signal after
switching can not pass through the echo input switching unit 85 and is not subjected to echo
processing. However, the microphone signal that has already passed through the echo input
switching unit 85 before switching is processed as it is by the echo signal generating unit 81 and
the echo volume adjusting unit 83, and is output to the mixing unit 7. The echo of the
microphone signal before switching lasts to the end, thus preventing the echo from being
unnaturally cut off artificially.
[0051]
Next, manual operation will be described. Here, in a so-called a cappella, it is assumed that the
microphone 23 is used for vocals without music. In this case, no audio signal is detected.
Therefore, temporarily following the automatic setting, the microphone adjustment unit 13 sets
the speech adjustment characteristic, and the echo processing unit 15 turns off the echo.
Adjustments suitable for vocals are not applied to the microphone signal and no echo is applied.
[0052]
Then, the manual operation unit 17 is operated. Thereby, the switch 45 is switched to the manual
side. Then, according to the operation signal from the manual operation unit 17, the first
switching unit 65 and the second switching unit 67 of the microphone signal adjustment unit 13
perform switching operation so that the vocal adjustment unit 63 processes the microphone
signal. Further, in the echo processing unit 15, the echo input switching unit 85 performs
switching operation so that the microphone signal is input to the echo signal generation unit 83,
whereby an echo signal is generated and passes through the echo volume adjustment unit 83 to
the mixing unit 7. Supplied. Then, although the audio signal is not input, the mixing unit 7 mixes
and outputs the microphone signal and the echo signal. In this way, even when there is no audio
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signal, the microphone signal is processed according to the vocal adjustment characteristics, and
echo is also applied, and the microphone 23 can be suitably used for a capella vocal.
[0053]
The audio signal processing device 1 according to the embodiment of the present invention has
been described above. According to the present embodiment, the presence or absence of an
audio signal is detected, and the adjustment characteristic of the microphone signal adjustment
unit 13 is switched between the vocal adjustment characteristic and the speech adjustment
characteristic according to the presence or absence of the audio signal. As a result, the
microphone signal can be adjusted according to the vocal adjustment characteristic during
performance, and the microphone signal can be adjusted according to the speech adjustment
characteristic after the performance is completed, and the microphone 23 can be suitably used
for vocals and speech.
[0054]
Further, according to the present embodiment, the microphone signal adjustment unit 13 adjusts
the volume of the microphone signal, and the volume adjustment amount is different between the
vocal adjustment characteristic and the speech adjustment characteristic, and the volume
adjustment amount of the speech adjustment characteristic is This is a value obtained by adding
a difference amount that compensates for the voice amount difference between vocal and speech
to the volume adjustment amount of the vocal adjustment characteristic. This makes it possible
to increase the volume when using speech more than when using vocals, and to avoid the volume
shortage in speech. Thus, even after the vocals, the same microphone 23 can be used to make the
speech better audible.
[0055]
Further, according to the present embodiment, the microphone signal adjustment unit 13 adjusts
the sound quality of the microphone signal, and the vocal adjustment characteristic and the
speech adjustment characteristic are different in frequency characteristics for adjusting the
sound quality. With respect to the frequency characteristic of the adjustment characteristic,
frequency components that are unnecessary in speech use are suppressed. As described above,
focusing on the fact that the frequency band required for speech use is narrower than that for
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vocal use, it is possible to reduce howling by suppressing unnecessary frequency components for
speech use.
[0056]
Further, according to the present embodiment, the echo input switching unit 85 that switches on
/ off of the echo according to the presence or absence of the audio signal is provided on the
input side of the echo signal generation unit 81, and the echo input side is muted. Thereby, echo
processing of the microphone signal already input at the switching time is continued to the end.
Therefore, it is possible to prevent the echo from being unnaturally cut off suddenly, and to make
the break of the echo natural.
[0057]
Further, according to the present embodiment, the audio volume adjustment unit 33 that adjusts
the volume of the audio signal is provided, and the audio signal is detected based on the presence
or absence of the volume in the signal output from the audio volume adjustment unit 33. Thus,
the microphone 23 can be suitably used for speech not only when the performance is finished
and the audio input is finished but also when the audio volume adjustment section reduces the
volume. For example, even when speech is suddenly required in the middle of a performance, the
microphone can be suitably used for speech automatically by reducing the volume by the audio
volume adjustment unit.
[0058]
Further, according to the present embodiment, the manual operation unit 17 is provided, and
switching of the vocal adjustment characteristic and the speech adjustment characteristic can be
manually operated. Thus, when it is desired to use the microphone 23 for vocals without playing,
for example, in the case of a cappella, the microphone 23 can be suitably used for vocals.
[0059]
In the above embodiment, the microphone input is one channel. However, the microphone input
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may have multiple channels. In this case, the above configuration is provided for each channel,
that is, the switchable microphone signal adjustment function is also provided for each channel,
and the switchable echo processing unit is also provided for each channel. Also, the audio input
may be multi-channel, in which case the presence or absence of the audio signal in all the
channels is detected and used for switching control. Also, the output system may be multichanneled.
[0060]
The preferred embodiments of the present invention have been described above. However, the
present invention is not limited to the above-described embodiment, and it goes without saying
that those skilled in the art can modify the above-described embodiment within the scope of the
present invention.
[0061]
As described above, the audio signal processing device according to the present invention has an
effect that the microphone can be suitably used for vocals and speech, and is useful as a mixer or
the like of various facilities.
[0062]
Block diagram of audio signal processing device according to an embodiment of the present
invention. Diagram showing vocal adjustment characteristics and speech adjustment
characteristics set by the audio signal processing device.
Explanation of sign
[0063]
DESCRIPTION OF SYMBOLS 1 voice signal processing apparatus 7 mixing part 11 audio signal
detection part 13 microphone signal adjustment part 15 echo process part 17 manual operation
part 21 performance apparatus 23 microphone 61 vocal adjustment part 63 speech adjustment
part 65 1st switching part 67 2nd switching part 71 Equalizer for vocal 73 Vocal volume
adjustment unit 75 Equalizer for speech 77 Speech volume adjustment unit 81 Echo signal
generation unit 85 Echo input switching unit
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