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JPH09271086

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DESCRIPTION JPH09271086
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects voice
vibration propagating in bone when a person utters, that is, bone conduction voice vibration from
a part of bone around the ear and converts it into an electrical signal to transmit it. The present
invention relates to a bone conduction microphone or a bone conduction microphone-earphone
having a mechanism to
[0002]
2. Description of the Related Art In this type of bone conduction microphone and bone
conduction earphone microphone, clothes, hair, hands, etc. come in contact with the body case
and the connection cable in order to use the body case and the connection cable attached to the
body. When this happens, noise may be mixed into the transmission signal, and due to this
problem, conventionally, for example, a vibration detector fixed to the main body case via a gellike substance (Japanese Patent Laid-Open No. 3-108997) Also, the mass of the earphone
microphone main body is increased, and the main body part that is likely to touch the outside of
the main body and the case part incorporating the signal detector are attached by a member
having a large elastic coefficient and added to the earphone microphone case A device in which
noise and vibration are not transmitted to the detector (Japanese Patent Application Laid-Open
Nos. 58-188993 and 3-108997 etc.) or an output of the vibration detector As to prevent the
transmission of noise to the cross-sectional by operating the pitch (JP 58-188997 JP), and the
like.
[0003]
08-05-2019
1
However, since the bone conduction microphone of this type detects the voice vibration signal
transmitted to the skull when it is beaten by the vibration detector in the main body case, the
main body case of the vibration detector is used. The sensitivity of the vibration detector is
influenced by the way of fixing the vibration sensor, and it is difficult to satisfy both the vibration
detection sensitivity and the noise detection sensitivity.
[0004]
Also, in the case of using a manual switch to turn off the output of the vibration detector, noise
vibration caused by swinging at the time of use, etc., generation of noise signal due to rubbing
between connection cable and clothes, frequency near resonance point There is a poor effect on
external noise vibration or the like in which the main body case having a component is directly
vibrated, and the switch is easily forgotten to be pushed, and there is also a problem that the
switch is turned on and off.
[0005]
For this reason, the present invention can provide an bone conduction microphone which can
eliminate the need for ON / OFF operation by a manual switch or the like when it is used, and can
prevent offensive noise from being transmitted without lowering the sensitivity of voice. With the
goal.
[0006]
For this purpose, according to the first aspect of the present invention, there is provided an audio
vibration detecting section for detecting an audio vibration transmitted through a bone and
converting it into an electric signal, and amplifying the electric signal of the audio vibration
detecting section. And a control unit for controlling the amplification degree of the amplifier and
an operation signal generation unit for operating the control unit, and the operation signal
generation unit includes the above-mentioned operation signal generation unit. When the voice
vibration detection unit detects a signal of a predetermined frequency or higher that is to be
regarded as a noise signal, the control unit is operated, and the operated control unit cuts off the
amplifier or reduces the amplification factor of the amplifier. It features.
[0007]
In the invention according to claim 2, the operation signal generation unit is a filter that outputs
only a signal of a frequency above a certain level that is to be regarded as a noise signal among
the electric signals of the voice vibration detection unit, and a direct current corresponding to the
output A signal level detector that outputs a voltage, a comparator that compares the voltage
output by the signal level detector with a preset reference value and outputs the voltage to the
08-05-2019
2
control unit when the voltage output by the signal level detector is larger And.
[0008]
In the invention according to claim 3, the operation signal generation unit is a filter that outputs
only a signal having a frequency equal to or higher than a predetermined frequency that is to be
regarded as a noise signal among electric signals of the voice vibration detection unit; And a
signal level detector for outputting a voltage, and the control unit is characterized in that the
amplifier is interrupted or the amplification degree of the amplifier is reduced according to the
output of the signal level detector.
[0009]
In the invention according to claim 4, the operation signal generation unit is a signal level
detector that outputs a DC voltage according to the output of the voice vibration detection unit, a
voltage output by the signal level detector, and a predetermined value or more. It is characterized
in that it has a comparator that compares with a reference value that is supposed to contain
noise, and outputs it to the control unit when the voltage output from the signal level detector is
larger.
[0010]
The invention according to claim 5 includes a voice vibration detection unit that detects voice
vibration transmitted to a bone and converts it into an electric signal, and an amplifier that
amplifies the electric signal of the voice vibration detection unit and outputs the signal to another
device. A noise / vibration detection unit that detects vibration propagating to a bone conduction
microphone body or a connection line connected to the bone conduction microphone body and
converts it into an electric signal in a bone conduction microphone; a control unit that controls
the amplification degree of the amplifier The operation signal generation unit operates the
control unit when the noise / vibration detection unit detects a signal of a predetermined
frequency or higher that is assumed to be a noise signal. The control unit operates to cut off the
amplifier or reduce the amplification degree of the amplifier.
[0011]
In the invention according to claim 6, the operation signal generation unit is a signal level
detector that outputs a DC voltage according to the electric signal of the noise and vibration
detection unit, and a voltage output by the signal level detector and preset. And a comparator
which compares with a reference value which is supposed to contain noise and which is output
to the control unit when the voltage output from the signal level detector is larger.
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3
[0012]
In the invention according to claim 7, the operation signal generation unit has a signal level
detector that outputs a DC voltage according to the electric signal output from the noise and
vibration detection unit, and the control unit outputs the signal level detector. The amplifier is
characterized in that the amplifier is turned off or the amplification degree of the amplifier is
reduced when it is assumed that the noise contains a certain level or more.
[0013]
In the invention according to claim 8, the noise / vibration detection unit is fixed to the bone
conduction microphone main body by the fixing means that easily propagates the vibration
propagating through the bone conduction microphone main body or the connection line
connected to the bone conduction microphone main body. It features.
[0014]
The invention according to claim 9 includes an electro-acoustic transducer for converting an
electrical signal from another transceiver into an audio signal, and the electro-acoustic
transducer is vibrated in the vicinity of the resonance frequency with the audio vibration
detection unit. It is characterized in that it is fixed to the bone conduction microphone main body
by a fixing means for preventing propagation of
[0015]
In the invention according to claim 10, the speech vibration detection unit is a speech vibration
detection element having a characteristic that detection sensitivity in a frequency band where
noise vibration appears more than speech vibration is lower than that in other frequency bands.
Do.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. The components denoted by the same reference
numerals represent the same or corresponding components.
FIG. 1 is a perspective view of a bone conduction microphone according to this embodiment, in
which 1 is a case main body having a size and shape that can be attached to the ear, and 2 is a
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4
case main body 1 and an external device It is a connection line for connecting to a machine etc.,
and inputs / outputs a transmission / reception signal.
An electro-acoustic transducer (speaker) 3 converts a received electric signal input from a
transceiver into an acoustic signal, and 4 detects bone conduction voice vibration propagating in
a bone when a person utters it It is a voice vibration detector that converts it into an electrical
signal and outputs it as a transmission signal to an external transceiver.
[0017]
FIG. 2 is a detailed block diagram of the voice vibration detector 4; 5 is a voice vibration
detection unit comprising a voice vibration detection element for detecting bone conduction
voice vibration propagating through bone; 6 is a voice vibration detection unit 5; It is an
amplifier which amplifies the electric signal to output and outputs it to the transmitter / receiver
(not shown) which is another apparatus via the connection line 2.
Reference numeral 11 denotes a gain control unit as a control unit that controls the amplification
degree of the amplifier 6, and 30 operates the gain control unit 11 when the voice vibration
detection unit 5 detects a signal of a predetermined frequency or higher to be simulated as a
noise signal. It is an operation signal creation unit.
The operation signal generation unit 30 in FIG. 2 includes an amplifier 7, a filter 8, a signal level
detector 9, and a comparator 10.
Among these, the amplifier 7 is connected in parallel to the amplifier 6, amplifies the electric
signal output from the voice vibration detection unit 5, and outputs it to the filter 8.
The filter 8 is for passing only a signal in the high-frequency band with severe attenuation in
voice vibration, and a high pass filter or a band pass filter is used.
[0018]
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5
The signal level detector 9 converts the output of the filter 8 into a DC voltage according to the
level and outputs the DC voltage to the comparator 10, and it is preferable to output the leveled
DC voltage to the comparator 10.
The comparator 10 compares the DC voltage output from the signal level detector 9 with a
preset voltage value, and outputs the comparison result to the gain control unit 11.
The gain control unit 11 performs control to change the amplification degree of the amplifier 6
according to the output of the comparator 10. However, in the case of FIG. 2, the amplification
degree of the amplifier 6 is reduced or the amplification degree of the amplifier 6 is zero.
The voice vibration detection unit 5 is a piezoelectric bimorph vibration detection element using
a piezoelectric plate, or a semiconductor vibration detection element that converts vibration of a
silicon beam into an electrical signal by a piezoelectric element material attached to the base of a
silicon beam. It can be configured by a vibrating element or the like of a type that converts a
change in capacitance component caused by a change in distance between two electrodes into an
electrical signal.
[0019]
Here, a propagation characteristic when speech vibration propagates in a bone will be described,
and a preferable characteristic as a vibration detection sensitivity of an element according to the
speech vibration detection unit 5 of this example will be described.
Fig. 3 shows a long-time frequency spectrum when a person utters, where A is a spectral
distribution when air conduction speech is detected at 10 to 15 cm in front of the mouth, and B
is a flat vibration detection frequency characteristic in the bone around the ear canal The longtime spectrum of bone conduction voice vibration when pressing and measuring a vibration pickup element is shown.
It is understood from FIG. 3 that the vibration propagating through the bone (characteristic B)
significantly attenuates the high frequency band (particularly, 1 KHz or more) than the vibration
(characteristic A) conducting air in front of the mouth.
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6
[0020]
Therefore, when a vibration detection element having a flat frequency characteristic having the
characteristic B in FIG. 3 is used for a call such as a telephone, if the characteristic B is outputted
from the amplifier 6 to the telephone side, the high frequency component is dropped. It becomes
a muddy sound.
In order to avoid this phenomenon, the high frequency component is compensated, and if the
transmission frequency has a flat characteristic, the built-in sound is compensated, but the noise
contained in the high frequency component is also compensated. turn into.
[0021]
FIG. 4 shows the frequency characteristic of the vibration detection level representing the
vibration detection sensitivity of the voice vibration detection element 5 according to the bone
conduction microphone, and in particular, a mechanical resonance point is set around 2 to 3 KHz
to compensate high frequency components. doing.
That is, as described above, since the voice vibration propagating the bone has few high
frequency components, the transmission signal with high clarity can be obtained by
appropriately setting the mechanical resonance region C having the highest sensitivity in the
high frequency portion. be able to.
However, since the resonance shown in FIG. 4 has a high impedance of its vibration system, it
has a high Q.
[0022]
FIG. 5 shows a characteristic D of a long time spectrum when bone conduction voice vibration is
detected by the voice vibration detection unit 5 having the characteristics of FIG. Compared to
the characteristic A when the air conduction voice signal is detected in front of the mouth, the
high frequency component is largely lost. Therefore, by setting the region in which the sensitivity
08-05-2019
7
drops sharply to a high frequency band outside the frequency band necessary for ordinary calls,
it is possible to obtain a more clearly transmitting speech signal.
[0023]
On the other hand, according to experiments, the vibration generated by touching or rubbing the
bone conduction microphone is flat. Therefore, the frequency characteristic of the detection
voltage generated by the noise vibration applied to the bone conduction microphone main body
1 is the frequency characteristic of the vibration detection element itself regardless of the voice
vibration detection unit 5 having any sensitivity frequency characteristic. . On the other hand,
since the voice signal output to the transmitter is a frequency characteristic in which the
frequency characteristic of the voice vibration detection unit 5 and the bone conduction
characteristic are combined, the noise and the voice have a difference due to the bone
conduction characteristic. Therefore, in this example, the high frequency component is taken out
by the filter 8, and when the comparator 10 indicates a value exceeding the reference value, the
control unit 11 lowers the amplification degree of the amplifier 6, By setting it to 0, transmission
of a noise signal to another device is prevented.
[0024]
Now, the operation of the bone conduction microphone according to the present embodiment
having the above configuration will be described in order below. When a person wearing the
bone conduction microphone main body 1 utters, the sound vibration detection unit 5 of the
sound vibration detector 4 detects sound vibration propagating in the bone around the ear and
outputs it to the amplifiers 6 and 7.
[0025]
The amplifier 6 outputs the amplified electric signal to another device via the connection line 2,
and the amplifier 7 outputs the amplified electric signal to the filter 8. The filter 8 passes only a
high frequency (for example, 4 KHz or higher) signal that can be simulated with a noise signal
and outputs it to the signal level detector 9, and the signal level detector 9 converts the signal
into a DC voltage according to the signal level. Convert and level to comparator 10 and output.
Then, the comparator 10 compares the input voltage with a preset voltage value (reference
value), operates the gain control unit 11 when the input signal is larger than the reference value,
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8
and causes the gain control unit 11 to operate than the reference value. When it is smaller, the
gain control unit 11 is not operated. The gain control unit 11 lowers the amplification degree of
the amplifier 6 by the operation signal output of the comparator 10, and makes the output or the
output 0 at a lower level to other devices. The passage reference value of the filter 8 and the
reference value of the comparator 10 may be set by selecting as appropriate, but may be set to a
size corresponding to the frequency generated by the contact or rubbing of the bone conduction
microphone main body 1.
[0026]
According to the bone conduction microphone of this example, among the vibrations detected by
the voice vibration detector 4 for detecting the voice vibration propagating in the bone, the
vibrations in the high frequency band above a certain level are not voice vibrations but the bone
conduction microphone body 1 The noise is almost always noise caused by rubbing (Figs. 3 to 5),
and the filter extracts only the signal that is assumed to be a noise signal in the high frequency
band above this fixed frequency, and this signal (noise signal) Since the gain control unit 11
performs control, by setting the amplification degree of the amplifier 6 to 0 or lower when the
noise signal is a predetermined value or more, it is possible to automatically prevent transmission
of offensive noise during a call.
[0027]
Further, although the speech vibration detection unit 5 is insensitive in advance to vibrations in a
high frequency band which hardly appears in normal conversation, it does not lower the speech
sensitivity in the practical range.
Further, according to the present embodiment, the on / off operation by the manual switch can
be made unnecessary particularly at the time of use. Furthermore, since the signal detected by
the voice vibration detection element 5 is amplified only once by the amplifier 6, it is
advantageous compared to the case where it is amplified twice (FIG. 8).
[0028]
Second Embodiment As shown in FIG. 6, the gain control unit 11 is replaced by a power control
unit 12 for controlling the power supply of the amplifier 6, and the power supply to the amplifier
6 is cut off only when there is an output of the comparator 10. In addition to this, the same effect
as that of the first embodiment can be obtained even when the amplifier 6 is turned on.
08-05-2019
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[0029]
Third Embodiment The present embodiment is configured by the amplifier 7, the filter 8, and the
signal level detector 9 except for the comparator 10 from the operation signal generation unit 30
of the first embodiment, and a block diagram thereof is shown in FIG. .
The signal level detector 9 outputs a DC voltage according to the output of the filter 8, but the
gain control unit 11 disconnects the amplifier 6 or reduces the amplification of the amplifier 6
according to the output of the signal level detector 9. Therefore, as in the first embodiment, it is
possible to prevent transmission of noise signals to other devices, and the comparator 10 can be
made unnecessary. In addition, in order to remove the comparator 10, it is desirable to set the
frequency band outputted by the filter 9 slightly lower than that of the first embodiment.
[0030]
Fourth Embodiment The present embodiment is an implementation of the first embodiment in
another form (FIG. 8), and the amplifier 7 of the first embodiment is connected in front of the
amplifier 6 to form the amplifier 13, the amplifier 13 An amplifier 6 for outputting to an external
device is connected behind the. In this device, the voice vibration detection element 5 detects
vibration, converts it into an electric signal and outputs it to the amplifier 13, and the signal is
amplified, but the amplified signal is output to the amplifier 6 and the filter 8, The operation is
the same as in the first embodiment.
[0031]
Embodiment 5 With the exception of the filter 8 of the operation signal generation unit 30 of
FIG. 2, the amplified signal is output directly from the amplifier 7 to the signal level detector 9,
and the signal and voltage value The gain control unit 11 or the power supply control unit 12
may be controlled by comparing with the reference value. In this case, the reference value of the
comparator 10 needs to be at least a DC voltage corresponding to the vibration in the high
frequency band that is unlikely to appear in normal conversation. With this configuration, the
configuration of the operation signal control unit 30 can be implemented more easily and easily.
08-05-2019
10
[0032]
Embodiment 6 This embodiment shows another embodiment for obtaining the same effect as
that of Embodiment 1, and FIG. 9 is a perspective view of the bone conduction microphone main
body 1 according to this embodiment, which is different from FIG. The point is provided closer to
the connection line 2 than the voice vibration detector 4 and is a noise and vibration detector 14
that detects the vibration propagating to the bone conduction microphone body 1 or the
connection line 2 connected to the bone conduction microphone body 1. It is a point provided.
FIG. 10 is a detailed block diagram of the voice vibration detector 4 and the noise vibration
detection unit 14. Reference numeral 15 denotes a noise vibration detection unit of the noise
vibration detector 14, and the other configurations are substantially the same as those in FIG.
[0033]
The noise / vibration detection unit 15 includes a noise / vibration detection element that detects
vibration generated by an impact or rubbing applied to the bone conduction microphone body 1
or the connection line 2 connected to the bone conduction microphone body 1 and converts it
into an electric signal. . The output of the noise and vibration detection unit 15 is output to the
operation signal generation unit 30, and the operation signal generation unit 30 detects the gain
control unit 11 when the noise and vibration detection unit 15 detects a signal of a
predetermined frequency or more that is simulated as a noise signal. Activate. The gain control
unit 11 reduces the amplification degree of the amplifier 6 by the output of the operation signal
generation unit 30, and prevents the output of a signal accompanied by much noise from the
amplifier 6 to other devices.
[0034]
The operation signal generation unit 30 includes an amplifier 16 that amplifies the output of the
noise and vibration detection unit 15, a signal level detector 9 that outputs a DC voltage
according to the output of the amplifier 16, and a voltage that the signal level detector 9 outputs.
And a reference value which is set in advance and is assumed to contain noise of a
predetermined level or more, and the comparator 10 which outputs to the gain control unit 11
when the voltage output from the signal level detector is larger. Therefore, in the present
example, the operation signal generation unit 30 does not receive the signal of the voice
vibration detection unit 5 to judge this, but receives the signal of the noise signal detection unit
15 installed in the vicinity of the connection line 2 and does not receive it. It differs from the one
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11
in FIG. 2 in the point of judgment.
[0035]
The frequency characteristics of the vibration applied to the bone conduction microphone main
body 1 will be described with reference to FIG. Characteristic F is a flat characteristic showing
the frequency characteristic of noise vibration generated by rubbing of the bone conduction
microphone main body 1 or the connecting wire 2, and characteristic B is a long time of voice
vibration propagating in the same bone as that of FIG. It is the characteristic of the frequency
spectrum. The difference between the noise vibration and the bone conduction voice vibration
appears notably in the frequency region G. Therefore, the identification method may be the same
as in the first embodiment, and in this example, it is determined whether the vibration of the
bone conduction microphone main body 1 or the connection line 2 is voice vibration or noise
vibration by the output level of the noise vibration detector 15. It is something to do. Therefore,
when the noise and vibration detector 15 detects a high frequency band, for example, about 3 to
4 KHz or more, which is falsely controlled to include noise of a certain level or more, it is
determined that the noise and vibration occur exclusively and not voice vibration. Good.
[0036]
That is, when an impact or rubbing occurs on the bone conduction microphone main body 1 or
the connection line 2, it is detected by the voice vibration detection unit 5 through the bone
conduction microphone main body 1 and is input to the amplifier 6 and noise vibration detection
unit 15 at the same time. Detects the noise vibration and outputs it to the operation vibration
creating unit 30. The amplifier 16 amplifies the electric signal from the noise and vibration
detection unit 15 and outputs the signal to the signal level detector 9. The signal level detector 9
outputs a DC voltage corresponding to the input electric signal to the comparator 10, and the
comparator 10 is assumed to include the voltage output by the signal level detector 9 and noise
set in advance and having a predetermined noise or more. To the gain control unit 11 when the
voltage output from the signal level detector is larger than the reference value, and the gain
control unit 11 controls the amplifier 6 according to the output of the comparator 10. For this
reason, the amplifier 6 can reduce or eliminate the amplification degree of the electrical signal of
the voice vibration detection unit 5 or can reduce or eliminate the output of the electrical signal
having many noise components to other devices.
[0037]
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12
In this example, in particular, the noise and vibration detection unit 15 is disposed at a position
closer to the connection line 2 than the voice and vibration detection unit 5, so noise vibration
can be detected more sensitively than the voice and vibration detection unit 5. And can be more
sensitive to noise.
[0038]
Even if the seventh embodiment or the sixth embodiment is configured as shown in the block
diagram of FIG. 12, it is possible to prevent transmission of noise vibration to another device.
That is, the gain control unit 11 is replaced by the power supply control unit 12 that controls the
power supply of the amplifier 6, and the power supply of the amplifier 6 is turned off when the
noise vibration detection unit 5 detects a vibration that is simulated as noise above a certain
level. Even if it can be realized.
[0039]
Eighth Embodiment Also, as shown in FIG. 13, the control of the gain control unit 11 is
performed according to the voltage output from the signal level detector 9, and the output
voltage of the signal level detector 9 is simulated with noise above a certain level. If it is assumed
that the voltage contains a voltage, the gain control unit 11 may cut off the amplifier 6 or reduce
the amplification degree of the amplifier 6. In this case, the operation signal generation unit 30 is
included in the gain control unit 11. With this configuration, the configuration of the operation
signal control unit 30 can be realized more easily.
[0040]
Although each embodiment of the ninth or more embodiment has been described as a bone
conduction microphone, even the bone conduction earphone microphone has the same effect,
and the electro-acoustic transducer 3 and the voice vibration detection unit 5 The noise /
vibration detection unit 15 can be prevented from malfunctioning if it is fixed by a fixing means
that hardly transmits the vibration in the vicinity of the resonance frequency, for example, an
adhesive or fixing member made of vinyl chloride or the like.
[0041]
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13
That is, the noise and vibration detection unit 15 may detect the vibration generated by the
electro-acoustic transducer 3 through the bone conduction microphone main body 1 and cause a
malfunction.
When the bone conduction microphone is connected to a transceiver of a telephone, the speech
band used for the telephone call is up to about 300 Hz to about 3.4 KHz. Therefore, when the
reception signal sound output from the electro-acoustic transducer 3 is transmitted as vibration
to the noise / vibration detection unit 15 through the bone conduction microphone main body 1,
unlike in the case of propagating the bone, the high frequency particularly There is a possibility
that it may be treated as a noise vibration because there is no phenomenon that is attenuated.
[0042]
Therefore, it is a member that hardly transmits the vibration near the resonance frequency so
that the vibration in the vicinity of the resonance frequency with the highest sensitivity of the
noise vibration detection unit 15 does not propagate from the electro-acoustic transducer 3 to
the bone conduction microphone main body 1 The electro-acoustic transducer 3 may be fixed to
the bone conduction microphone main body 1.
[0043]
According to the first aspect of the present invention, there is provided an operation signal
generation unit for operating the control unit for controlling the amplification degree of the
amplifier, and in the operation signal generation unit, the voice vibration detection unit is
simulated with a noise signal. When the controller detects a signal with a certain frequency or
higher, the controller activates the controller, which turns off the amplifier or reduces the
amplification factor of the amplifier. It can be made unnecessary and has the effect of being able
to prevent offensive noise from being transmitted without reducing the sensitivity of speech.
[0044]
In the invention according to claim 2, since the operation signal generation unit further includes
a filter, a signal level detector, and a comparator, noise and false noise can be easily controlled by
the filter and the comparator among the vibrations detected by the voice vibration detection unit.
It has the effect of being able to easily make settings for specifying the noise level.
[0045]
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14
According to the third aspect of the invention, the control of the amplifier can be realized by the
control unit, the filter, and the signal level detector, so that the configuration of the operation
signal generation unit can be simplified.
[0046]
According to the fourth aspect of the present invention, the control of the amplifier can be
realized by the control unit, the signal level detector, and the comparator, so that the
configuration of the operation signal generation unit can be simplified.
[0047]
In the invention according to claim 5, since the operation signal generation unit determines the
level of noise based on the vibration detected by the noise signal detection unit and operates the
control unit, the speech vibration detection unit exclusively detects the speech vibration; Since
the noise and vibration detection unit only needs to detect noise and vibration, it has an effect of
being able to detect noise with high sensitivity and reduce or block the transmission of a signal
containing noise.
[0048]
In the invention according to claim 6, since control of the amplifier can be realized by the control
unit, the signal level detector, and the comparator, the configuration of the operation signal
generation unit can be realized more easily.
[0049]
In the invention according to claim 7, since control of the amplifier can be realized by the control
unit and the signal level detector, the configuration of the operation signal generation unit can be
realized more easily.
[0050]
In the invention according to claim 8, the noise / vibration detection unit is further fixed to the
bone conduction microphone main body by the fixing means that easily propagates the vibration
in the vicinity of the resonance frequency of the bone conduction microphone main body. It has
the effect of being able to sensitively detect rubbing and the like.
[0051]
In the invention according to claim 9, further, since the electro-acoustic transducer does not
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15
propagate the vibration near the resonance frequency to the bone conduction microphone main
body, the noise vibration detection unit detects a signal inputted from the outside to the bone
conduction microphone and erroneously It has an effect which can prevent operating.
[0052]
In the invention according to claim 10, since the speech vibration detection unit is a speech
vibration detection element having a characteristic that detection sensitivity in a frequency band
where noise vibration appears more than speech vibration is lower than that in other frequency
bands. It becomes difficult for the vibration detection unit to detect noise in the frequency band
corresponding to the voice vibration generated in normal conversation, and it is possible to
reduce the transmission of noise to other devices.
[0053]
Brief description of the drawings
[0054]
FIG. 1 is a perspective view of a bone conduction earphone microphone according to
Embodiment 1 of the present invention.
[0055]
FIG. 2 is a block diagram of a voice and vibration detector according to Embodiment 1 of the
present invention.
[0056]
3 is a diagram showing a long time frequency spectrum when a person utters.
[0057]
FIG. 4 is a characteristic diagram of a vibration detection frequency according to Embodiment 1
of the present invention.
[0058]
FIG. 5 is a characteristic diagram of a vibration detection frequency according to Embodiment 1
of the present invention.
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[0059]
FIG. 6 is a block diagram according to Embodiment 2 of the present invention.
[0060]
FIG. 7 is a block diagram according to Embodiment 3 of the present invention.
[0061]
FIG. 8 is a block diagram according to Embodiment 4 of the present invention.
[0062]
FIG. 9 is a perspective view of a bone conduction earphone microphone according to
Embodiment 6 of the present invention.
[0063]
FIG. 10 is a block diagram according to Embodiment 6 of the present invention.
[0064]
FIG. 11 is a characteristic diagram of a vibration detection frequency according to a sixth
embodiment of the present invention.
[0065]
FIG. 12 is a block diagram according to Embodiment 7 of the present invention.
[0066]
FIG. 13 is a block diagram according to Embodiment 8 of the present invention.
[0067]
Explanation of sign
[0068]
1 is a main body case, 2 is a connection line, 4 is a voice vibration detector, 5 and 15 are voice
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vibration detection elements, 6, 7, 13 and 16 are amplifiers, 8 is a filter, 9 is a signal level
detector, and 10 is a comparison 11 is a gain control unit, 12 is a power supply control unit, 14
is a noise vibration detection element, 15 is a noise vibration detection unit, and 30 is an
operation signal generation unit.
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