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JP2013183196

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DESCRIPTION JP2013183196
Abstract: [Problem] To provide a microphone device capable of obtaining an audio output taking
advantage of the characteristics of an audio microphone and a throat microphone according to
the degree of noise. An audio microphone M1, a throat microphone M2, and switching selection
switches SW1 and SW2 are provided. When the switching selection switches SW1 and SW2
select the first selection mode M, only the output from the audio microphone M1 is derived to
the output terminal OUT, and when the second selection mode B is selected, the audio
microphone M1 An output obtained by adding the output from the throat microphone M2 to the
output is derived to the output terminal OUT. When the third selection mode P is selected, only
the output from the throat microphone M2 is derived to the output terminal OUT. [Selected
figure] Figure 1
Microphone device
[0001]
The present invention relates to a microphone device capable of utilizing the functions of a
throat microphone and a voice microphone according to the degree of noise.
[0002]
Conventionally, it has been proposed to use a throat microphone under high noise.
The throat microphone converts the vibration of the throat into an electrical signal using, for
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example, a piezoelectric element, and can collect voiced sounds without being affected by
ambient noise. (See, for example, Patent Document 1) However, since this throat microphone
detects the vibration of the part of the throat, the frictional noise and the bursting sound of the
voice can not be collected, and the clarity of the voice is reduced.
[0003]
On the other hand, condenser microphones are often used as the above-mentioned voice
microphones, taking advantage of the small size. In particular, electret condenser microphones
are convenient to be used as unidirectional close talk microphones because polarization voltage
does not need to be applied to the unit. This voice (close-talking) microphone can exhibit sound
collection characteristics with high intelligibility in a relatively low noise environment. (For
example, refer to patent document 2)
[0004]
Japanese Patent Application Laid-Open No. 10-79999 Japanese Patent Application Laid-Open No.
2011-135481
[0005]
As described above, it is preferable to use the throat microphone under high noise, and by using
the voice microphone as a close-talking microphone under relatively low noise, it is possible to
take advantage of the respective characteristics, and the degree of noise It was necessary to use
both separately made by separate set.
[0006]
Therefore, when moving between a high noise place and a low noise place, or in an environment
where the noise level changes frequently even at the same place, the above-mentioned throat
microphone and voice microphone are used properly. The treatment is very cumbersome.
[0007]
The present invention has been made focusing on the above-mentioned problems, and when the
noise is high, only the output of the throat microphone is derived, and when the noise is medium,
the throat microphone and the voice microphone are combined. Output can be derived, and when
the noise is low (minor), the output of the voice microphone alone can be derived, so that the
voice output that makes use of the characteristics of each microphone under any noise It is an
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object of the present invention to provide a microphone device capable of obtaining
[0008]
A microphone device according to the present invention, which has been made to solve the
above-mentioned problems, includes an audio microphone, a throat microphone, and a switching
selection switch, and the switching selection switch can select at least first to third selection
modes. And in the first selection mode, only the output from the voice microphone is output to
the output terminal, and in the second selection mode, the output from the voice microphone and
the output from the throat microphone are added to the output terminal. In the third selection
mode, only the output from the throat microphone is derived to the output terminal.
[0009]
In this case, as the throat microphone, a configuration using a piezoelectric element as an audio
signal output source can be suitably adopted.
In addition, a configuration in which a condenser microphone or a dynamic microphone is
preferably used as the close talk type microphone as the voice microphone can be suitably
adopted.
[0010]
And in a preferred embodiment, in the second selection mode in the case where a condenser
microphone is used as the voice microphone, the piezoelectric element of the throat microphone
is connected in series to the output terminal of the impedance converter of the condenser
microphone. An output obtained by adding an output of the throat microphone to an output of
the voice microphone is derived to the output terminal.
[0011]
According to the above-described microphone device according to the present invention, it is
possible to select the first to third selection modes using the switching selection switch according
to the degree of noise.
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Thereby, when the first selection mode is selected, for example, only the output from the close
talk type audio microphone can be used, and an audio signal with high clarity can be obtained.
When the second selection mode is selected, an output obtained by adding the output of the
throat microphone to the output of the voice microphone can be used, and the high clarity audio
signal canceled by the noise is affected by the noise. It can be covered by the difficult throat
microphone output.
[0012]
Further, when the third selection mode is selected, only the output from the throat microphone
can be used, so that the function of transmitting the audio signal can be exhibited even under
high noise.
As described above, it is possible to provide a microphone device capable of utilizing the
functions of the microphones according to the noise without reattaching, for example, the sets of
the close-talking voice microphones and the throat microphones.
[0013]
FIG. 1 is a block diagram showing a first embodiment of a microphone device according to the
present invention.
FIG. 7 is a block diagram showing a second embodiment of the present invention as well.
[0014]
Hereinafter, a microphone device according to the present invention will be described based on
an embodiment shown in the drawings.
First, FIG. 1 shows a first embodiment, which shows an example using an electret condenser
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microphone as a voice microphone. The code | symbol M1 has shown the electret condenser
microphone unit which functions as an audio | voice microphone, This microphone unit M1 is
utilized as a close talk microphone of a single directivity.
[0015]
Reference numeral BA denotes a buffer amplifier which operates as an impedance converter of
the microphone unit M1. The buffer amplifier includes a bias circuit built-in type FET Q1, and a
DC drive power source E1 is connected to the drain of the FET Q1. A source resistor is connected
to the source of the FET Q1 to form a source floor circuit, and thus the source of the FET Q1
constitutes an output terminal T1 of the impedance converter of the condenser microphone. The
diodes D1 and D2 and the resistor Rb connected in anti-parallel between the gate and the source
of the FET Q1 generate a gate bias of the FET Q1.
[0016]
One end of a coupling capacitor C1 for cutting a DC component is connected to the source of the
FET Q1 functioning as the output terminal T1 of the above-described impedance converter, and
the other end is a first switch SW1 of the interlock switch selection switch. 1 is connected to the
selected terminal M. Further, one end of a piezoelectric element M2 functioning as a throat
microphone is connected to the source of the FET Q1 functioning as an output terminal of the
impedance converter, and the other end is a second selected terminal B and a third target in the
first switch SW1. It is connected to the selection terminal P.
[0017]
The first selected terminal M and the second selected terminal B of the second switch SW2 are
connected to the reference potential point (earth), and the third selected terminal P of the second
switch SW2 is an impedance converter. It is connected to the source of the FET Q1 functioning as
the output terminal T1. The selection terminal of the first switch SW1 is an audio signal output
terminal OUT, and the selection terminal of the second switch SW2 is connected to a reference
potential point (earth).
[0018]
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In addition, as said piezoelectric element M2 which functions as a throat microphone, it is
desirable to utilize the lamination | stacking type | mold with large electrostatic capacitance,
Preferably that with an electrostatic capacitance of about 1000 nF is used. According to this, the
piezoelectric element M2 functions as a coupling capacitor having a relatively low impedance
with respect to an audio signal by the microphone unit M1 provided from the output terminal T1
of the impedance converter, and as a throat microphone by the piezoelectric element M2. The
voice output can be effectively added to the voice output of the condenser microphone.
[0019]
In the above configuration shown in FIG. 1, the first switch SW1 and the second switch SW2
constitute the interlocking type switching selection switch as described above, and the first and
second switches SW1 and SW2 are the first target In the first selection mode for selecting the
selection terminal M, only the output from the close-talking voice microphone is derived to the
output terminal OUT.
[0020]
That is, in the first selection mode, the output from the microphone unit (audio microphone) M1
is impedance-converted by the buffer amplifier BA, and is brought to the output terminal OUT via
the coupling capacitor C1 and the first switch SW1.
At this time, the second switch SW2 selects the reference potential, and does not affect the
selection operation of the first switch SW1.
[0021]
In the second selection mode in which the first and second switches SW1 and SW2 select the
second selected terminal B, the output by the throat microphone (piezoelectric element M2) is
output to the microphone unit (voice microphone) M1. Is derived to the output terminal OUT.
[0022]
That is, in the second selection mode, the output of the microphone unit M1 is impedance-
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converted to the source of the FET Q1 and output, and the piezoelectric element M2 of the throat
microphone is connected in series to the source to generate the output of the microphone unit
M1. The outputs from the throat microphone (piezoelectric element M2) are added and provided
to the output terminal OUT via the first switch SW1.
At this time, the second switch SW2 selects the reference potential, and does not affect the
selection operation of the first switch SW1.
[0023]
Further, in the third selection mode in which the first and second switches SW1 and SW2 select
the third selected terminal P, only the output by the throat microphone (piezoelectric element
M2) is led to the output terminal OUT To be done. That is, in this case, the second switch SW2
selects the reference potential, and sets one end of the piezoelectric element M2 constituting the
throat microphone to the reference potential. Further, since the first switch SW1 selects the other
end of the piezoelectric element M2 constituting the throat microphone, only the output from the
throat microphone M2 is provided to the output terminal OUT via the first switch SW1.
[0024]
As described above, according to the microphone device according to the first embodiment
described above, by setting the switching selection switch to the first to third selection modes
according to the degree of noise, under any noise, It is possible to obtain an audio output taking
advantage of the characteristics of the close talk type audio microphone and the throat
microphone, and it is possible to obtain the operation effects as described in the column of the
above-mentioned effects of the invention.
[0025]
Next, FIG. 2 shows a second embodiment, which shows an example using a dynamic microphone
as an audio microphone.
In FIG. 2, parts that perform the same functions as the parts shown in FIG. 1 are indicated by the
same reference numerals. Therefore, duplicate explanations are omitted.
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[0026]
According to the embodiment shown in FIG. 2, the dynamic microphone M3 is used as a single
directional close-talking microphone as an audio microphone. Therefore, according to this
embodiment, the buffer amplifier BA constituting the impedance converter shown in FIG. 1 and
the DC drive power source E1 for driving the buffer amplifier are not required, and the
configuration is further simplified.
[0027]
That is, the output terminal T1 of the voice microphone by the dynamic microphone M3 is
connected to the first selected terminal M in the first switch SW1 of the interlocking type
selection switches. Further, one end of a piezoelectric element M2 constituting a throat
microphone is connected to the output terminal T1 of the voice microphone M3, and the other
end of the piezoelectric element M2 is connected to a second selected terminal B of the first
switch SW1. It is connected to the third selected terminal P. On the other hand, the output
terminal T1 of the voice microphone M3 is connected to the third selected terminal P of the
second switch SW2 of the interlocking type switching selection switch.
[0028]
In the first selection mode in which the interlocked first and second switches SW1 and SW2
select the first selected terminal M in the above configuration shown in FIG. 2, only the output
from the audio microphone M3 is output terminal OUT To be derived. That is, in the first
selection mode, the output terminal T1 of the dynamic microphone (audio microphone) M3 is
connected to the output terminal OUT via the first switch SW1. At this time, the second switch
SW2 is not selected and does not affect the selection operation of the first switch SW1.
[0029]
In the second selection mode in which the first and second switches SW1 and SW2 select the
second selected terminal B, the output by the throat microphone (piezoelectric element M2) is
used as the output by the dynamic microphone (sound microphone) M1. Is derived to the output
terminal OUT.
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[0030]
That is, in the second selection mode, the piezoelectric element M2 of the throat microphone is
connected in series to the output terminal T1 of the dynamic microphone M3, and the output of
the throat microphone (piezoelectric element M2) is added to the output of the microphone M3.
It is brought to the output terminal OUT via the first switch SW1.
At this time, the second switch SW2 is not selected and does not affect the selection operation of
the first switch SW1.
[0031]
Further, in the third selection mode in which the first and second switches SW1 and SW2 select
the third selected terminal P, only the output by the throat microphone (piezoelectric element
M2) is led to the output terminal OUT To be done. That is, in this case, the second switch SW2
selects the reference potential, and sets one end of the piezoelectric element M2 constituting the
throat microphone to the reference potential. Further, since the first switch SW1 selects the other
end of the piezoelectric element M2 constituting the throat microphone, only the output from the
throat microphone M2 is provided to the output terminal OUT via the first switch SW1.
[0032]
As described above, also in the microphone device according to the second embodiment
described above, by setting the switching selection switch to the first to third selection modes
according to the degree of noise, contact is made under any noise. It is possible to obtain an
audio output taking advantage of the characteristics of the speech microphone and the throat
microphone, and to obtain the operation and effects as described in the column of the abovementioned effects of the invention.
[0033]
BA Buffer amplifier (impedance converter) C1 Coupling capacitor E1 DC drive power supply M1
Electret condenser microphone unit M2 Throat microphone (piezoelectric element) M3 Dynamic
microphone OUT Output terminal Q1 FET Rs Source resistance SW1 1st switch (switching
selection switch) SW2 2nd 2 switch (switch selection switch) T1 voice microphone output
terminal
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