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DESCRIPTION JP2011217067

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DESCRIPTION JP2011217067
The present invention provides a technology for outputting an input sound signal without
clipping it. SOLUTION: Compression control information predetermined in accordance with a
microphone volume for amplifying an output signal of a microphone 10 is inputted from a
compressor control unit 103 to a compressor 104, and the compressor 104 receives an audio
signal from the microphone 10. And the compression control information according to the
microphone volume instructed from the compressor control unit 103, the signal level of the
audio signal is compared with a predetermined threshold, and the audio signal exceeding the
threshold is compared with the microphone volume. Compression processing according to the
specified compression mode and output. [Selected figure] Figure 2
Sound signal output control device
[0001]
The present invention relates to a sound signal output control device.
[0002]
The compressor performs signal compression processing so as not to reach the maximum signal
level when a sound signal exceeding a predetermined signal level is input, and is also used in a
karaoke apparatus or the like.
Patent Document 1 below discloses a karaoke apparatus having a recording function of
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performing gain-down and mixing so that the output data of audio data and audio data having
different output levels are matched to the lower output level.
[0003]
JP 2004-295934 A
[0004]
By the way, when the input signal exceeds the threshold value set in the compressor, the
compressor performs compression processing to cause distortion in the waveform of the audio
signal.
Since there is a demand for outputting the audio signal from the microphone in the karaoke
apparatus as much as possible without distortion, it is preferable not to perform compression
processing by the compressor. On the other hand, when the volume value of the amplifier for
amplifying the audio signal from the microphone is large, there is a problem that the clip occurs
if the compression processing by the compressor is not effectively applied. The present invention
provides an audio output control device for outputting an input sound signal without clipping it.
[0005]
The sound signal output control device according to claim 1 of the present invention defines a
sound volume detection unit that detects a microphone sound volume that amplifies a sound
signal input from a microphone, and a compression mode of the sound signal according to the
microphone sound volume. Storage means for storing compression control information, and
when the sound signal input from the microphone exceeds a preset threshold value, the storage
means in the storage means according to the microphone volume detected by the volume
detection means The audio signal processing apparatus is characterized by comprising
compression means for performing compression processing on the sound signal exceeding the
threshold according to compression control information, and output means for outputting the
sound signal compressed by the compression means.
[0006]
A sound signal output control device according to claim 2 of the present invention is the sound
signal output control device, wherein the howling detection means analyzes the frequency
component of the sound signal and detects the frequency component causing the howling;
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Attenuation amount storage means for storing the attenuation amount of the sound signal
according to the microphone volume, and the frequency component causing the howling
detected by the howling detection means according to the microphone volume detected by the
volume detection means Attenuation amount storage means includes a howling suppression
means for attenuating according to the attenuation amount, and the output means outputs a
sound signal subjected to the compression processing by the compression means and the
attenuation processing in the howling suppression means. .
[0007]
In the sound signal output control device according to claim 3 of the present invention, in the
sound signal output control device, the threshold value is a threshold value determined in
advance according to the microphone volume, and the compression control information is The
first time from when the sound signal input from the microphone exceeds the threshold to the
compression, and the second time from when the sound signal becomes less than the threshold
again to the end of compression, the ratio of compression And the compression means, based on
the compression control information according to the microphone volume detected by the
volume detection means, after the first time has elapsed from the time when the sound signal
exceeds the threshold, The sound signal is compressed according to the ratio of the compression,
and the compression of the sound signal is stopped when the second time has elapsed from the
time when the sound signal becomes less than the threshold.
[0008]
According to the configuration of the first aspect, the sound signal input from the microphone
can be output without clipping.
[0009]
According to the configuration described in claim 2, howling of the sound signal input from the
microphone can be suppressed.
[0010]
According to the third aspect of the present invention, the compression process according to the
microphone volume can be appropriately performed on the sound signal input from the
microphone.
[0011]
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It is a block diagram showing composition of a karaoke device concerning an embodiment.
It is a figure explaining the composition of the sound signal processing part concerning an
embodiment.
(A) is a figure showing composition and data examples of compression control information
concerning an embodiment.
(B) is a figure showing composition and data examples of howling control information concerning
an embodiment.
It is the figure which illustrated the waveform of the audio signal concerning an embodiment.
It is a figure explaining the compression aspect of the audio | voice signal which concerns on
embodiment.
(A)-(d) is a figure explaining compression processing concerning an embodiment. It is a figure
explaining howling suppression processing of an audio signal concerning an embodiment.
[0012]
The sound signal output control device according to the present embodiment will be described
by way of example in the case of being incorporated and used in a karaoke device, but may be
used alone or in combination with a tone generator other than the karaoke device. It is also good.
Hereinafter, the configuration of the karaoke apparatus according to the present embodiment
will be described.
[0013]
FIG. 1 is a block diagram showing the configuration of the karaoke apparatus according to the
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present embodiment. In the karaoke apparatus 1, the microphone 10 is connected to the
microphone connection terminal, and includes the control unit 11, the operation unit 12, the
storage unit 13, the sound source unit 14, the display unit 15, and the audio signal processing
unit 16. .
[0014]
The microphone 10 is, for example, a speaker microphone such as a condenser microphone, and
sends to the audio signal processing unit 16 a sound signal obtained by collecting the singing
voice emitted by the singer. The control unit 11 includes a CPU and a memory such as a RAM
and a ROM, and controls each unit connected to the control unit 11 by executing a control
program stored in the ROM using the RAM as a working area. . In particular, the control unit 11
detects a microphone volume (gain) for amplifying the output signal of the microphone 10
according to the volume of the microphone 10 set by the operation unit 12 described later, and
detects the detected microphone volume as the audio signal processing unit 16 Send to
[0015]
The operation unit 12 is an operation means for receiving an operation from a user by wire or
wireless, and a microphone volume operation knob for receiving an operation to set a
microphone volume, a music volume operation knob for receiving a music volume adjustment
operation, a singing sound And a main volume adjustment knob for accepting the adjustment
operation of the entire volume combining the respective audio signals of the music, and an
operation element such as an operation button for instructing the selection operation of the
music and reproduction or stop of the music. The operation unit 12 sends an operation signal
indicating an operation by the user to the control unit 11.
[0016]
The storage unit 13 is composed of a non-volatile storage medium, and stores audio signal
processing control information 130 referred to in the signal processing of the audio signal
processing unit 16 in addition to music data such as MIDI and lyrics data. ing. The audio signal
processing control information 130 includes compression control information and howling
control information, the details of which will be described later.
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[0017]
Under the control of the control unit 11, the sound source unit 14 reproduces the instructed
music data to generate a musical tone signal, and sends it to the audio signal processing unit 16.
The display unit 15 is configured of a liquid crystal display or the like, and displays the lyrics
data of the instructed music and the operation content accepted by the operation unit 12 under
the control of the control unit 11.
[0018]
The audio signal processing unit 16 is an example of a sound signal output control device
according to the present invention, and the audio signal processing unit 16 performs
predetermined signal processing on a sound signal input from the microphone 10 under the
control of the control unit 11. Apply and output. Here, the details of the audio signal processing
unit 16 will be described. FIG. 2 is a block diagram centering on the configuration of the audio
signal processing unit 16. The audio signal processing unit 16 includes a preamplifier 101, an A
/ D conversion unit 102, a compressor control unit 103, a compressor 104, a howling
suppression unit 105, a howling suppression control unit 106, a mixer 107, a D / A conversion
unit 108, an amplifier 109, a speaker It is comprised including 110. In the present embodiment,
the compressor control unit 103, the compressor 104, the howling suppression unit 105, the
howling suppression control unit 106, and the mixer 107 are realized by a DSP (Digital Signal
Processor).
[0019]
The preamplifier 101 amplifies the output signal from the microphone 10 according to the
microphone volume instructed by the control unit 11 and sends the amplified signal to the A / D
conversion unit 102. The A / D converter 102 A / D converts the output signal output from the
preamplifier 101, and sends the A / D converted audio signal to the compressor 104.
[0020]
The compressor control unit 103 detects the microphone volume output from the control unit
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11, reads compression control information corresponding to the detected microphone volume
from the storage unit 13, and sends the compression control information to the compressor 104.
The compressor 104 is compression means according to the present invention, and the
compression control information sent from the compressor control unit 103 when the signal
level of the audio signal outputted from the A / D conversion unit 102 exceeds a threshold
according to the microphone volume. The audio signal is compressed according to
[0021]
Here, the compression control information will be described. FIG. 3A is a diagram showing an
example of the configuration and data of compression control information. In this figure, the
microphone volume indicates the range (V1 <V2 <V3... <Vn) of the microphone volume that can
be set by the microphone volume operation knob. The attack time (ΔT1) indicates the time from
when the audio signal exceeds the threshold to the start of compression processing, and the
release time (ΔT2) is after the audio signal falls below the threshold again until the compression
processing is stopped It shows time. Also, the ratio is a compression ratio that compresses the
audio signal according to the microphone volume. The threshold (Vth) is a signal level to be
compressed, and is set to a value smaller than the maximum signal level (Vmax) of the
compressor 104.
[0022]
For example, when the audio signal of the waveform 30 shown in FIG. 4 is output from the A / D
conversion unit 102, when this audio signal is input to the compressor 104, as shown in FIG.
From the time when the attack time ΔT1 corresponding to the microphone volume has elapsed,
the compression process of the audio signal is started according to the ratio corresponding to the
microphone volume. Then, the compression process is stopped when the release time ΔT2
according to the microphone volume elapses from t2 at which the signal level of the audio signal
becomes less than or equal to the threshold value Vth again. As a result of this compression
processing, the waveform 31 is compressed.
[0023]
In this embodiment, in the compression control information shown in FIG. 3A, the attack time
and the release time are set shorter as the microphone volume is larger (T31 <T21 <T11 <...),
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(T12) <T22 <T32 ...). Also, the ratio is set to a larger value as the microphone volume is larger
(R1 <R2 <R3...), And the threshold is set to a larger threshold as the microphone volume is larger
(Vth1 <Vth2 <Vth3. . That is, since the sound input to the microphone 10 is amplified as the
microphone volume is higher, the threshold is set to be higher by the amount amplified by the
microphone volume, and the ratio is increased to prevent clipping at the maximum signal level of
the compressor 104. In addition to setting, attack time and release time are set to be short, and
high compression processing is performed on the audio signal exceeding the threshold. When the
microphone volume is low, the amplification of the sound input to the microphone 10 is also
small, so the threshold is set smaller than when the microphone volume is high, and the attack
time and release time are longer than when the microphone volume is high. Set and perform low
compression processing on the audio signal exceeding the threshold. As described above, the
dynamic range of the appropriate volume according to the microphone volume is defined to
dynamically change the threshold, and the compression process according to the microphone
volume is performed, so that it is appropriate to which microphone volume is set. Since the signal
level of the audio signal can be automatically adjusted so as to obtain the dynamic range, the
volume can be made easy for the user to listen to.
[0024]
Here, examples of audio signals input from the microphone 10 when the microphone volume is
V3 and V1 (V3> V1) are shown in FIGS. 6 (a) and 6 (b). When the microphone volume is V3, as
shown in FIG. 6A, the audio signal from the microphone 10 has many peak waveforms with large
amplitudes, and these peak waveforms are processed as in the conventional case and the
compressor is The maximum signal level Vmax of 104 is reached. When the microphone volume
is V1, as shown in FIG. 6B, the audio signal from the microphone 10 has many peak waveforms
with small amplitude, and the compressor 104 is processed even if it is processed as in the prior
art. Maximum signal level Vmax is not reached. Hereinafter, the process when the audio signal of
each waveform of FIG. 6 (a) and (b) is input into the compressor 104 is each demonstrated.
[0025]
When an audio signal shown by the waveform in FIG. 6A is input to the compressor 104, the
compressor control unit 103 detects the microphone volume "V3" sent from the control unit 11,
and corresponds to the microphone volume "V3". The attack time “T31”, the release time
“T32”, the ratio “R3”, and the threshold value “Vth3” are selected from the compression
control information in the storage unit 13 and are sent to the compressor 104.
[0026]
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The compressor 104 starts compression processing of the audio signal at a compression ratio of
the ratio "R3" when the attack time "T31" elapses from the time when the signal level of the input
audio signal exceeds the threshold value Vth3 and the audio signal The compression process is
stopped when the release time "T32" elapses from when the value of V falls again below the
threshold value vth3.
By this compression processing, the audio signal input to the compressor 104 is compressed in a
compression mode according to the microphone volume before reaching the maximum signal
level, and becomes a waveform as shown in FIG. 6C, and the input audio signal is It is possible to
prevent clipping at the maximum signal level Vmax.
[0027]
Next, when an audio signal shown by the waveform in FIG. 6B is input to the compressor 104,
the compressor control unit 103 detects the microphone volume “V1” sent from the control
unit 11, and the microphone volume “V1” is detected. The attack time “T11”, the release
time “T12”, the ratio “R1”, and the threshold value “Vth1” corresponding to “1” are
selected from the compression control information in the storage unit 13 and are sent to the
compressor 104.
[0028]
The compressor 104 starts compression processing of the audio signal at a compression ratio of
the ratio "R1" when the attack time "T11" passes from the time when the signal level of the input
audio signal exceeds the threshold value Vth1, and the audio signal The compression process is
stopped when the release time "T12" elapses from when the value of V falls again below the
threshold value vth1.
Among the audio signals input to the compressor 104, the audio signal exceeding the threshold
value is subjected to the low compression processing, resulting in a waveform as shown in FIG. 6
(d). The above is the compression processing by the compressor 104.
[0029]
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Return to FIG. 2 and continue the description. Howling suppression control unit 106 reads
howling control information indicating attenuation conditions according to the microphone
volume output from control unit 11 from storage unit 13 and instructs howling suppression unit
105. Here, howling control information will be described. FIG. 3B is a diagram showing an
example of howling control information and data. In this figure, the microphone volume indicates
the range (V1 <V2 <V3... <Vn) of the microphone volume that can be set by the microphone
volume operation knob similarly to the compression control information described above, and
corresponds to each microphone volume. The amount of gain attenuation is defined as the gain
of the howling frequency component. In the present embodiment, in view of the fact that the
amplitude level of the howling frequency increases as the microphone volume increases, the
attenuation amount is set to increase as the microphone volume increases (G1 <G2 <G3...).
[0030]
The howling suppression unit 105 performs frequency analysis processing using fast Fourier
transform on the audio signal output from the compressor 104, and generates audio of
frequency components exceeding the predetermined amplitude level (hereinafter referred to as
howling frequency components). The signal is attenuated using a notch filter in accordance with
the attenuation amount based on the howling control information instructed from the howling
suppression control unit 106. Specifically, for example, when a frequency spectrum as shown in
FIG. 7 is obtained as a result of frequency analysis of the input audio signal in howling
suppression section 105, a frequency exceeding predetermined amplitude level Ath It detects
that howling is occurring at f1. The howling suppression unit 105 uses the howling frequency f1
as the center frequency, determines the Q value based on the howling frequency f1 and the
amplitude level, and uses the notch filter with the gain of the howling control information
instructed from the howling suppression control unit 106 as an attenuation amount. The howling
frequency f1 component is attenuated.
[0031]
Return to FIG. 2 and continue the description. The mixer 107 outputs to the D / A converter 108
an audio signal obtained by combining the audio signal output by suppressing the howling in the
howling suppression unit 105 and the musical tone signal generated in the sound source unit 14.
The D / A conversion unit 108 performs D / A conversion processing on the audio signal output
from the mixer 107 and outputs the result to the amplifier 109. Then, the amplifier 109
amplifies the audio signal output from the D / A conversion unit 108 and outputs it to the
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speaker 110 according to the microphone volume instructed by the control unit 11 and the
volume set by the main volume operation control. The speaker 110 emits sound.
[0032]
In the embodiment described above, when the signal level of the audio signal input to the
compressor 104 exceeds a threshold appropriately set according to the microphone volume of
the microphone 10, an attack time, a release time according to the microphone volume, It can be
compressed according to the ratio. Therefore, the audio signal input in the compressor 104 can
not be clipped at the maximum signal level, and can be output so as to prevent unnatural sound
quality. In addition, since the howling frequency component in the audio signal output from the
compressor 104 can be attenuated and output using the attenuation amount appropriately set
according to the microphone volume, the audio emitted from the speaker 110 is Howling in the
case where the sound is picked up again by the microphone 10 can be suppressed.
[0033]
<Modification> Although the embodiment of the present invention has been described, the
present invention is not limited to the above-described embodiment, and can be practiced in
various other forms. For example, the above-mentioned embodiment may be modified as follows,
and the present invention may be implemented, and each modification may be combined and
implemented. Hereinafter, modifications of the embodiment according to the present invention
will be described.
[0034]
(1) In the embodiment described above, different threshold values are set in advance according
to the microphone volume, but only one fixed threshold is set for the microphone volume lower
than a predetermined value, and the predetermined value is set. In the case of a larger
microphone volume, different threshold values may be set according to the microphone volume
as in the embodiment. Further, only one ratio, one attack, and one release parameter may be set
for the microphone volume lower than a predetermined value.
[0035]
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(2) In the above-described embodiment, the compressor 104 performs compression processing
based on compression control information according to the microphone volume, but the
compressor control unit 103 determines that the microphone volume is equal to or less than a
predetermined value. Alternatively, the compressor 104 may be configured not to perform
compression processing.
[0036]
(3) In the embodiment described above, the howling suppression unit 105 attenuates the
component of the howling frequency by an attenuation amount according to the microphone
volume when the howling is detected regardless of whether the compression process is
performed by the compressor 104 or not. In the case where compression processing is
performed by the compressor 104, compression processing is performed such that the
attenuation amount of the howling frequency component is reduced by a predetermined amount
and attenuated as compared to the case where compression processing is not performed. The
amount of attenuation may be changed depending on whether or not it is.
In this case, information on whether or not compression processing has been performed by the
compressor 104 is notified to the howling suppression control unit 106 or the howling
suppression unit 105.
[0037]
(4) In the above-described embodiment, the attack time and the release time are set differently
according to the microphone volume, but only different ratios may be set according to the
microphone volume, or according to the microphone volume. Only different attack times may be
set. Also, only different release times may be set according to the microphone volume. Further,
any two parameters among the ratio, attack time, and release time may be set to be different
depending on the microphone volume.
[0038]
(5) Further, in the above-described embodiment, the compression control information and the
howling suppression information corresponding to the range of the microphone volume are
stored in the storage unit 13 in advance, but in the compression control information and the
howling suppression information The compression control information and the howling are
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stored using a predetermined arithmetic expression, such as storing only predetermined
reference values and adding or multiplying the reference values with the change amounts of the
compression control information and the howling suppression information according to the
microphone volume. You may make it ask for suppression information.
[0039]
(6) In the embodiment described above, the compression control information and the howling
suppression information according to the microphone volume are stored in the storage unit 13.
However, in addition to the microphone volume, for example, the karaoke apparatus 1 is
installed. The compression control information and the howling suppression information may be
stored according to the sound transfer characteristic of the room being played.
In this case, the sound transmission characteristic of each room where the karaoke apparatus 1 is
provided is measured in advance, and the compression control information and howling
corresponding to the sound transmission characteristic and the microphone volume according to
the room where the karaoke apparatus 1 is provided. The suppression information is configured
to be instructed to the compressor 104 and the howling suppression unit 105.
[0040]
(7) In the embodiment described above, the compressor control unit 103 and the howling
suppression control unit 106 instruct the compressor 104 and the howling suppression unit 105
to perform compression control information and howling control information. The compression
control information and the howling control information may be instructed to the 104 and the
howling suppression unit 105.
[0041]
(8) In the embodiment described above, when the howling suppression unit 105 detects that
howling occurs in a plurality of different frequency components, if the plurality of howling
frequencies is in the vicinity of the predetermined range, the plurality of howling frequencies is
May be configured to be attenuated by one notch filter.
For example, among the components of three different howling frequencies f1, f2 and f3 (f1 <f2
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<f3), if the howling frequencies f1 and f2 are within a certain range, the Q value is reduced to
include the howling frequencies f1 and f2 The frequency components are attenuated by the
notch filter.
[0042]
(9) Although the music data is stored in the storage unit 13 in the embodiment described above,
the karaoke device 1 is provided with a communication unit, and music data is acquired from an
external device connected via a communication line. It may be configured to be played back and
music data stored in a recording medium such as an optical disk may be obtained and played
back.
[0043]
DESCRIPTION OF SYMBOLS 1 ... Karaoke apparatus, 10 ... Microphone, 11 ... Control part, 12 ...
Operation part, 13 ... Storage part, 14 ... Sound source part, 15 ... Display part, 16 * · · Audio
signal processing unit, 101 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · compressor Suppression control unit 107: mixer 108: D /
A converter 109: amplifier 110: speaker
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