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DESCRIPTION JPH04363995

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DESCRIPTION JPH04363995
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speech processing apparatus for processing speech.
[0002]
2. Description of the Related Art Conventionally, as an apparatus for processing audio, an audio
signal is formed by converting audio into an electrical signal by a microphone or the like, and the
formed audio signal is recorded on a recording medium by a tape recorder or the like. There is a
voice recording device.
[0003]
In the above-mentioned voice recording apparatus, the frequency characteristic of the voice
signal amplification circuit for amplifying the voice signal generated from the microphone is
often almost constant. In this case, when the wind or the like hits the microphone, recording is
attempted. In order to prevent the influence of the wind by mounting a wind screen or the like to
the microphone, the sound of the wind is mixed with the sound in the form of noise as noise and
degrades the sound signal.
[0004]
Further, since noise generated by the above-mentioned wind noise is a low frequency signal in
terms of frequency, in recent years, the frequency characteristic of the audio signal amplifier
circuit is such that low frequency components can be removed from the audio signal. The user
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can prevent the influence of the wind by providing the changeover switch and operating the
changeover switch in the presence of wind to operate the voice signal amplification circuit so as
to remove the low frequency components of the voice signal. .
[0005]
However, in the case of the above-mentioned conventional apparatus, there is a problem that the
apparatus becomes large in size when the influence of the wind is prevented by the windscreen.
[0006]
When the operator operates the changeover switch to operate the audio signal amplification
circuit so as to remove the low frequency components of the audio signal by operating the
changeover switch, the operator can prevent the wind from being affected. It is very difficult to
determine the presence or absence of the switch to operate the changeover switch, and there is
the possibility of erroneous operation.
[0007]
That is, in order to determine how much the effect of the wind sound is on the operator, it is
necessary to constantly monitor the sound collected by the microphone, which is inconvenient
for the operator.
[0008]
Further, when the changeover switch is operated without monitoring the voice, for example,
although the wind is applied to the microphone, if the changeover switch is not operated and the
low frequency component of the audio signal is not removed, The level of the sound of wind is
higher than the level of the sound to be recorded, and the level of the entire sound collected by
the microphone by the sound of wind is lowered by the function of AGC (AutoGain Controller) in
the sound signal amplifier circuit Also, even if the microphone does not hit the wind, if the switch
is operated and the low frequency components of the audio signal are removed, the low
frequency components of the sound collected by the microphone will always be Because it is
removed, the sound quality of the audio that you are trying to record is impaired To become.
[0009]
The present invention solves the above-mentioned problems, and provides a voice processing
apparatus capable of easily processing voice without being affected by noise such as wind with a
simple configuration without increasing the size of the apparatus. The purpose is to
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[0010]
SUMMARY OF THE INVENTION A voice processing apparatus according to the present invention
is an apparatus for processing voice, comprising: wind detection means for detecting the strength
of wind; and an input voice input voice signal. Low-frequency attenuation means for attenuating
and outputting low-frequency signals of the signal, and control means for controlling the
attenuation characteristics of the low-frequency attenuation means according to the wind
intensity detected by the wind detection means And converting means for converting sound into
an audio signal and outputting it, wind detecting means for detecting wind intensity provided in
the vicinity of the converting means, and sound output from the converting means A low
frequency frequency attenuation means for inputting a signal, attenuating a low frequency signal
of the input audio signal and outputting the same, and the low frequency frequency attenuation
means according to the wind intensity detected by the wind detection means Damping
characteristics at Control means, and wind detection means for detecting the strength of the
wind, and frequency characteristic variable means for inputting an audio signal, varying the
frequency characteristic of the input audio signal, and outputting the variable. Control means for
controlling the variable characteristic of the frequency characteristic variable means according to
the wind intensity detected by the wind detection means, and converting means for converting
sound into an audio signal and outputting the sound signal Wind detection means for detecting
the strength of the wind provided in the vicinity of the conversion means, and the audio signal
output from the conversion means are input, and the frequency characteristic of the input audio
signal is varied and output It has a frequency characteristic variable means, and a control means
for controlling the variable characteristic of the frequency characteristic variable means
according to the wind intensity detected by the wind detection means.
[0011]
According to the above configuration, the voice can be easily processed without being affected by
noise having a low frequency band such as wind with a simple configuration without upsizing the
device. It becomes like.
[0012]
EXAMPLES Hereinafter, the present invention will be described using examples of the present
invention.
[0013]
FIG. 1 is a view showing the schematic arrangement of a voice recording apparatus according to
a first embodiment of the present invention.
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[0014]
In FIG. 1, 1 is a microphone for converting voice into an electrical signal, 2 is a variable filter for
changing the frequency characteristic of the audio signal generated from the microphone 1, 3 is
output from the variable filter 2 An amplifier for amplifying an audio signal, 4 is a recording unit
for recording the audio signal amplified by the amplifier 3 on a recording medium such as a
magnetic tape, and 5 is a wind detection sensor for detecting the presence or absence of wind.
And a mechanical-electrical conversion element 7 such as a piezoelectric element that converts
the movement of the diaphragm 6 into an electrical signal and generates a frequency signal
according to the movement of the diaphragm 6 There is.
Reference numeral 8 denotes a filter for extracting a signal of a frequency band representing
generation of wind from a frequency signal generated by the electromechanical transducer 7 in
the wind detection sensor 5. Reference numeral 9 amplifies the frequency signal output from the
filter 8 Amplifier 10, a detection circuit for detecting a frequency signal amplified by the
amplifier 9 and outputting a detection signal, 11 a change in frequency characteristic of the
variable filter 2 controlled by the detection signal output from the detection circuit 10 Is a time
constant circuit for setting an attack recovery time so as not to be bothered by hearing.
[0015]
In FIG. 1, the sound collected by the microphone 1 is converted into an electric signal (ie, an
audio signal) and supplied to the variable filter 2.
[0016]
FIG. 4 shows the frequency characteristics of the signal output from the microphone 1. In FIG. 4,
A indicates the frequency characteristics of the voice to be recorded, and W in FIG. 4 indicates
the frequency of wind noise. It shows the characteristics.
[0017]
As shown in FIG. 4, since the frequency characteristics of voice are distributed around 1 KHz
except in special cases, a voice amplifier circuit such as a tape recorder is used to eliminate the
influence of the wind noise. As shown in 6, the signal component of the wind noise (W 'in the
figure) is often attenuated by attenuating the audio signal of 100 Hz or less.
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However, since wind noise seeds have several characteristics with a frequency of 100 Hz or
more, high frequency components of wind noise having a frequency band of 50 to 200 Hz, for
example, remain unattenuated, and the sound quality of the voice to be recorded Will deteriorate.
[0018]
Therefore, in the present embodiment, of the frequency signals generated by the wind detection
sensor 5 of FIG. 1, as shown in FIG. A signal of a frequency band as shown (for example, 10 to 70
Hz) is extracted by the filter 8 and a wind is generated according to the detection level of the
detection signal obtained by detecting the extracted frequency signal by the detection circuit 10
3 and detects the signal pass characteristic of the variable filter 2 to which the audio signal
generated from the microphone 1 is supplied, for example, changes the attenuation of the low
frequency as shown in FIG. 2, or By changing the cutoff frequency of the low band as shown in
FIG. 5, the influence of wind noise is eliminated.
[0019]
The above-described processing operation will be described in detail below.
[0020]
From the frequency signal generated by the wind detection sensor 5 of FIG. 1 with the generation
of wind, the filter 8 extracts the signal of the frequency band indicated by B in FIG. 4 and the
extracted signal is The signal is amplified by the stage amplifier 9 and supplied to the detection
circuit 10.
[0021]
The detection circuit 10 detects the frequency signal output from the amplifier 9, whereby the
detection signal is output from the detection circuit 10 and supplied to the time constant circuit
11.
[0022]
In the time constant circuit 11, the detection signal output from the detection circuit 10 is
integrated by a capacitor or the like, and when the level of the integrated signal exceeds a
predetermined threshold value, the variable filter is adjusted according to the level of the
integrated signal. The pass characteristic of No. 2 is continuously changed in the direction to
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attenuate the low frequency component, and the capacitor is discharged, and the pass
characteristic of the variable filter 2 is attenuated in the low frequency component even when
the capacitor is discharged. By changing it continuously, as shown in FIG. 7 by the variable filter
2, the change of the frequency characteristic for attenuating the wind noise signal component (W
′ ′ in the drawing) mixed in the sound signal I try not to be bitter.
[0023]
An audio signal whose wind noise signal component has been attenuated by the variable filter 2
is amplified by the amplifier 3 and then recorded on a recording medium such as a magnetic tape
in the recording unit 4.
[0024]
As described above, in the present embodiment, the frequency characteristic of the variable filter
for attenuating the low frequency components in the audio signal output from the microphone is
changed according to the wind intensity detected by the wind detection sensor. The wind noise
signal component mixed in the voice signal can be attenuated by configuring it so that, for
example, even if AGC is applied before recording on the recording medium, the wind noise signal
component affects the noise. It becomes possible to prevent the level of the audio signal
component to be recorded from being attenuated.
[0025]
FIG. 8 is a view showing the schematic arrangement of a voice recording apparatus according to
a second embodiment of the present invention.
[0026]
In FIG. 8, reference numeral 12 denotes a variable equalizer for changing the frequency
characteristic of the audio signal generated by the microphone 1. The other configuration is the
same as that of the first embodiment shown in FIG. Therefore, the same reference numerals are
attached and detailed description is omitted.
[0027]
In the present embodiment, among the frequency signals generated by the wind detecting sensor
5 of FIG. 8, as shown in FIG. 5, as shown by B for the frequency band (A in the figure) of the
sound to be recorded. Whether or not the wind is generated according to the detection level of
the detection signal obtained by extracting a signal in a wide frequency band (for example, 10 to
70 Hz) by the filter 8 and detecting the extracted frequency signal by the detection circuit 10
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The frequency characteristic of the variable equalizer 12 to which the audio signal generated by
the microphone 1 is supplied is changed, for example, as shown in FIG. 9, or the level of the low
frequency component is changed, or as shown in FIG. It is configured to remove the influence of
wind noise by changing the cutoff frequency of the low band.
[0028]
The above-described processing operation will be described in detail below.
[0029]
From the frequency signal generated by the wind detection sensor 5 of FIG. 8 in accordance with
the generation of wind, the filter 8 extracts a signal of the frequency band indicated by B in FIG.
The signal is amplified by the stage amplifier 9 and supplied to the detection circuit 10.
[0030]
The detection circuit 10 detects the frequency signal output from the amplifier 9, so that the
detection signal is output from the detection circuit 10 and supplied to the time constant circuit
11.
[0031]
The time constant circuit 11 integrates the detection signal output from the detection circuit 10
with a capacitor or the like, and when the level of the integrated signal exceeds a predetermined
threshold, the variable equalizer is adjusted according to the level of the integration signal. The
frequency characteristic of 12 is continuously changed in the direction to attenuate the level of
the low frequency component, and the capacitor is discharged, and the frequency characteristic
of the variable equalizer 12 is reduced to the level of the low frequency component even when
the capacitor is discharged. Change in frequency characteristics for attenuating the wind noise
signal component (W ′ ′ in the figure) mixed in the audio signal as shown in FIG. 7 by the
variable equalizer 12 by continuously changing in the decreasing direction Is trying not to be
bothered by hearing.
[0032]
An audio signal whose wind noise signal component has been attenuated in the variable
equalizer 12 is recorded in a recording medium such as a magnetic tape in the recording unit 4.
[0033]
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As described above, in the present embodiment, the frequency characteristic of the variable
equalizer which reduces the level of the low frequency component in the audio signal output
from the microphone in accordance with the wind intensity detected by the wind detection
sensor. The wind noise signal component mixed in the voice signal can be attenuated, for
example, even if AGC is applied before recording on the recording medium, the wind noise signal
component The influence makes it possible to prevent the level of the audio signal component to
be recorded from being attenuated.
[0034]
Although in each of the embodiments the wind detection sensor is composed of a diaphragm and
a mechanical-electric conversion element such as a piezoelectric element, only the piezoelectric
element may be used as the wind detection sensor. The same effect can be obtained by using a
switch that is turned on / off according to the presence or absence of wind, a sensor whose
resistance value changes according to the intensity of wind using a photo coupler, etc. as a wind
detection sensor. .
[0035]
Furthermore, by installing the wind detection sensor in the vicinity of the microphone or in the
same case, the wind detection sensor can detect the wind strength substantially equal to the wind
hitting the microphone, so that the wind can be accurately measured. It becomes possible to
remove the influence of noise.
[0036]
As described above, according to the present invention, it is possible to easily process voice
without being affected by noise such as wind with a simple configuration without increasing the
size of the device. It will be possible to provide an audio processing device that can
[0037]
Brief description of the drawings
[0038]
1 is a diagram showing a schematic configuration of a voice recording apparatus as a first
embodiment of the present invention.
[0039]
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2 is a diagram showing the frequency characteristics of the variable filter 2 in the voice
recording apparatus shown in FIG.
[0040]
3 is a diagram showing another frequency characteristic of the variable filter 2 in the voice
recording apparatus shown in FIG.
[0041]
4 is a diagram showing the frequency characteristics of the signal output from the microphone 1
in the voice recording device shown in FIG.
[0042]
5 is a diagram showing the frequency characteristics of the filter 8 in the voice recording
apparatus shown in FIG.
[0043]
6 is a diagram showing the frequency characteristics of the signal output from the audio
amplification circuit in the conventional audio recording device.
[0044]
7 is a diagram showing the frequency characteristics of the signal output from the variable filter
2 in the voice recording device shown in FIG.
[0045]
<Figure 8> It is the figure which shows the outline constitution of the sound recording device as
2nd execution example of this invention.
[0046]
9 is a diagram showing the frequency characteristics of the variable equalizer 12 in the audio
recording device shown in FIG.
[0047]
10 is a diagram showing another frequency characteristic of the variable equalizer 12 in the
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sound recording apparatus shown in FIG.
[0048]
Explanation of sign
[0049]
Reference Signs List 1 microphone 2 variable filter 3 amplifier 4 recording unit 5 wind detection
sensor 6 diaphragm 7 electromechanical conversion element 8 filter 9 amplifier 10 detection
circuit 11 time constant circuit 12 variable equalizer
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