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JP2013153364

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DESCRIPTION JP2013153364
Abstract: In a throat microphone that outputs vibration generated in a throat of a human body as
an audio signal, generation of noise due to vibration applied from the outside other than the
throat is prevented. A throat microphone having a first vibration-electric transducer (20) pressed
against a throat through a neckband (10) or the like attached to a neck of a human body and
converting vibration generated in the throat into an audio signal. A second vibration-electric
converter 30 for detecting mechanical vibration applied to the neck band 10 as an electrical
noise signal, and the second vibration-electric converter 30 performs a first vibration-electric
conversion Control the audio output level of the [Selected figure] Figure 1
Throat microphone
[0001]
The present invention relates to a throat microphone that outputs as an audio signal a vibration
generated in a throat of a human body, and more particularly to a technology for preventing
noise generation due to an externally applied vibration other than the throat.
[0002]
The throat microphone which detects the vibration of the throat is used in the environment
where the noise which is difficult to transmit with a normal condenser microphone or a dynamic
microphone is large, for example, a repair shop of an airplane or a construction site in a tunnel.
[0003]
The throat microphone has a vibration-electric converter consisting of a piezoelectric element as
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its pickup (vibration detection unit), and is used by pressing it against the throat.
[0004]
In that case, in order to be able to transmit while both hands are free, it is often formed in a Cshape to press the pickup against the throat, since it is inconvenient if one hand is pressed by
hand. The used neck band is used (see Patent Documents 1 and 2).
[0005]
Patent Document 1: Japanese Patent Application Laid-Open No. 10-79999 Patent Document 2:
Japanese Patent Application Laid-Open No. 2005-117536
[0006]
However, since the pickup picks up any vibration due to its structure, for example, when the
throat microphone is attached or detached, or when the pickup is touched, the vibration may
output unpleasant noise together with the audio signal.
[0007]
Therefore, an object of the present invention is to prevent noise generation due to vibration
applied from the outside other than the throat in a throat microphone that outputs the vibration
generated in the throat of the human body as an audio signal.
[0008]
In order to solve the above problems, the present invention is a throat microphone having a first
vibration-electric transducer that is pressed against the throat through a holding member for a
human body and converts the vibration generated in the throat into an audio signal. A second
vibration-electric converter is provided which detects mechanical vibration applied to the holding
member as an electrical noise signal, and the first vibration-electric converter is operated by the
second vibration-electric converter. It is characterized in that the audio output level of is
controlled.
[0009]
According to a preferred aspect of the present invention, a VOX circuit is connected between the
first vibration-electric converter and the audio signal output terminal, and an output side of the
second vibration-electric converter is connected. A level detection circuit for detecting the level
of the detected noise signal is connected, and the output of the level detection circuit controls the
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VOX circuit.
[0010]
In a preferred embodiment of the present invention, the VOX circuit comprises an on / off switch
circuit or an attenuation circuit.
[0011]
Further, the holding member includes a pickup case in which the vibration-electric converters are
accommodated, and the first vibration-electric converter is disposed in the pickup case via a
predetermined vibration isolation means. Preferably, the second vibration-electric converter is
directly attached to the inner surface of the pickup case.
[0012]
The holding member is preferably a neck band made of a substantially C-shaped elastic wire
attached around the neck of a human body, but a microphone support arm of a headset may be
used.
[0013]
According to the present invention, the mechanical vibration applied to the holding member such
as the neck band by the tentacle at the time of attachment / detachment of the throat
microphone or the like is detected by the second vibration-electric transducer for noise detection,
thereby the first vibration. -Since the sound output level of the electrical converter is controlled
(e.g., off at 0 level or attenuated to a predetermined level), it is possible to prevent the generation
of noise due to externally applied vibration other than the throat.
[0014]
FIG. 1 is a schematic view of an embodiment of a throat microphone according to the present
invention.
The circuit diagram of the throat microphone in the said embodiment.
[0015]
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Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
However, the present invention is not limited to this.
[0016]
As shown in FIG. 1, the throat microphone 1 basically includes a neck band 10 as a holding
member for a human body, and two first and second vibration-electric transducers 20 and 30.
The vibration-electric converter may be called "pickup".
[0017]
The neck band 10 is made of a substantially C-shaped elastic wire (including a round bar and a
band plate) attached around the neck of a human body (not shown).
The material may be either metal or synthetic resin, but it is preferable that the material has a
nice touch since it touches the neck directly.
Note that, instead of the neck band, a microphone support arm of a headset may be used.
[0018]
In this embodiment, at one end side of the neck band 10, a pickup case 11 for housing the
respective pickups 20, 30 is integrally provided.
The material of the pickup case 11 may be either metal or synthetic resin.
[0019]
For each of the first and second pickups 20 and 30, a piezoelectric element that generates a
voltage by an applied force (external force) is used.
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[0020]
There are several types of piezoelectric elements such as monomorphs and bimorphs, any of
which may be used.
The first pickup 20 and the second pickup 30 are preferably the same type of piezoelectric
element, but may be different types of piezoelectric elements.
[0021]
In this embodiment, the first pickup 20 is for detecting an audio signal, and the second pickup 30
is for detecting a noise signal.
[0022]
Therefore, the first pickup 20 is provided with a contact 20a that contacts the throat.
An opening 11a is bored in a portion corresponding to the throat of the pickup case 11, and the
contact 20a protrudes from the opening 11a.
[0023]
Further, the first pickup 20 for detecting an audio signal, including the portion of the pickup case
11, is made of a rubber elastic body as an anti-vibration means in order to make it difficult to
transmit an external force by a feeler or the like applied to the neck band 10. It is preferable to
be attached to the inside of the pickup case 11 via 23.
[0024]
On the other hand, since the second pickup 30 for noise signal detection directly detects
mechanical vibration due to an external force applied to the neck band 10 including the pickup
case 11, as shown in FIG. Preferably, it is directly attached to the inner surface of the pickup case
11.
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[0025]
Next, the circuit configuration of the throat microphone 1 will be described with reference to FIG.
2. The first pickup 20 for detecting an audio signal is connected to the audio signal output
terminal 22 with a VOX (Voice Operation Control) circuit. 21 is provided.
In this embodiment, the VOX circuit 21 comprises an on / off switch circuit, but may be
configured as an attenuation circuit.
[0026]
Further, the second pickup 30 for noise signal detection is connected with a level detection
circuit 31 for detecting the level of the detected noise signal.
[0027]
The level detection circuit 31 outputs, for example, a Lo signal to the VOX circuit 21 when
the level of the noise signal is lower than a predetermined threshold level, and, for example,
when the level of the noise signal exceeds the threshold level. "Hi" signal is output.
The level detection circuit 31 of this type is, for example, a part number NJM2072 manufactured
by New Japan Radio Co., Ltd.
[0028]
In operation, the throat microphone 1 is pressed against the throat of the human body (user)
through the neckband 10, and no external force such as a tentacle is applied to the neckband 10
including the pickup case 11, Since the output of the level detection circuit 31 is "Lo", the VOX
circuit 21 is kept switched on, an audio signal detected by the first pickup 20 appears at the
audio signal output terminal 22, and a predetermined signal not shown is generated. The signal
is transmitted to the receiving circuit on the receiving side via the transmitting circuit.
[0029]
On the other hand, when external force is applied to the neck band 10 including the pickup case
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11 by the tentacle or the like when the throat microphone 1 is attached or removed, vibration
due to the external force is detected as a noise signal by the second pickup 30. When the level of
the noise signal exceeds a predetermined threshold value, the output of the level detection circuit
31 changes from "Lo" to "Hi".
[0030]
As a result, since the VOX circuit 21 is switched off, the first pickup 20 and the audio signal
output terminal 22 are disconnected, and the output of the unpleasant noise signal is prevented.
When the VOX circuit 21 is an attenuation circuit, the level of the audio signal output from the
first pickup 20 is attenuated to a predetermined level.
[0031]
When the level of the noise signal due to the applied external force becomes smaller than the
predetermined threshold, the VOX circuit 21 is switched on, and an audio signal from the first
pickup 20 appears at the audio signal output terminal 22.
[0032]
As described above, according to the present invention, it is possible to prevent output of
unpleasant noise generated when attaching or detaching the throat microphone or touching the
microphone.
[0033]
DESCRIPTION OF SYMBOLS 1 throat microphone 10 neck band (holding member) 11 pickup
case 20 first vibration-electric transducer (first pickup) 20a contactor 21 VOX circuit 22 sound
signal output terminal 23 rubber elastic body (anti-vibration means) 30 first 2 vibration-electric
converter (second pickup) 31 level detection circuit
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