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JP2007027811

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2007027811
The present invention provides an earphone microphone integrated with an earphone and a
microphone that can prevent picking up noise from the surroundings and can easily separate an
input signal of the microphone from an output audio signal. A mechanical vibration is
transmitted between a piezoelectric actuator (5) to which an electrical signal (9) is applied, a
piezo sensor (6) from which an electrical signal is taken, and the same diaphragm (7). [Selected
figure] Figure 1
Earphone microphone which shares diaphragm
[0001]
The present invention relates to an earphone microphone, and more particularly to an earphone
microphone in which an earphone and a microphone are integrated.
[0002]
A so-called earphone microphone in which a conventional earphone and a microphone (referred
to as a microphone in the present specification) are connected to a wireless device or the like
with a single cord, as shown in FIG. It was connected to a radio or the like through the cord 3 and
the connector 4.
[0003]
When the earphone and the microphone are separate parts in this way, when using a
communication device such as a wireless device or a mobile phone in a hands-free manner,
attachment of the earphone and the microphone is troublesome, and the noise of the microphone
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is around In order to pick up, clear sound collection under noisy environment was difficult.
[0004]
Although there is also a bone conduction microphone as a device to prevent picking up noise
from the surroundings, it is necessary to be in close contact with the bone, and significant
deterioration in sound quality can not be avoided.
[0005]
Conventionally, there has been a magnetic type earphone microphone in which an earphone and
a microphone are integrated, but this generates a sound from the diaphragm by applying an
electric signal to a voice coil fixed to the diaphragm, to the diaphragm By adding a sound wave,
an audio signal is obtained from the same voice coil.
Since this type of earphone microphone has a single input / output system, it has been very
difficult to separate signals generated from sound waves (input separation).
And since input processing requires DSP processing, it has been expensive.
[0006]
The speaker and microphone device of the portable wireless device proposed in Japanese Patent
Application Laid-Open No. 9-139691 is that the speaker and the microphone are separate parts,
so it is difficult to clear the sound collection under the above-mentioned noise environment.
There was a problem.
JP-A-9-139691, paragraph 0013, FIG.
[0007]
The present invention has been made in view of the above-described point, and the object of the
present invention is to prevent picking up noise from the surroundings and to easily separate the
input signal of the microphone from the audio signal to be output. It is to provide an earphone
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microphone that integrates an earphone and a microphone that can
[0008]
The earphone microphone sharing the diaphragm according to the present invention is
configured such that mechanical vibration is transmitted between the same piezoelectric
diaphragm and both the piezo actuator to which the electrical signal is applied and the piezo
sensor from which the electrical signal is extracted. It is.
[0009]
Further, in the earphone microphone that shares the diaphragm, the diaphragm, the piezo
actuator, and the piezo sensor are stacked.
[0010]
Further, in the earphone microphone sharing the same diaphragm, a piezo actuator and a piezo
sensor are concentrically fixed to the diaphragm.
[0011]
According to the earphone microphone of the present invention, it is possible to prevent noise
from being picked up from the surroundings, and it is possible to easily separate the input signal
of the microphone from the audio signal to be output.
[0012]
Hereinafter, the best mode for carrying out the present invention will be described according to
an embodiment.
[0013]
FIG. 1 is a schematic side view showing a configuration of an earphone microphone according to
a first embodiment of the present invention.
The piezo actuator 5, the piezo sensor 6 and the diaphragm 7 shown in the figure are in the form
of a disc, and are adhered in a coaxially overlapped state.
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[0014]
The piezo actuator 5, the piezo sensor 6 and the diaphragm 7 integrated in this way are covered
with a cover not shown to form an earphone microphone.
An earphone output signal 9 having a waveform shown by a is applied to the piezo actuator 5.
Then, the piezo actuator 5 vibrates in the waveform of the input signal.
[0015]
The vibration of a waveform indicated by b is transmitted to the diaphragm 7 from the tympanic
membrane or bone by the sound production of the speaker wearing the above-mentioned
earphone microphone, and the vibration sound transmitted from the piezo actuator 5 via the
piezo sensor 6 Radiate.
[0016]
The vibration of the diaphragm 7 and the piezo actuator 5 is transmitted to the piezo sensor 6,
and the piezo sensor 6 vibrates in the waveform of a synthetic wave shown by c.
Then, the electric signal of the waveform of the composite wave is output to the subtraction
circuit 10.
[0017]
The subtraction circuit 10 subtracts the signal corresponding to the signal of the earphone
output signal 9 from the output signal of the piezo sensor 6 to extract the signal of the sound
wave input to the diaphragm 7 as an electric signal.
In this way, simultaneous processing of the sound output signal of the speaker with the earphone
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microphone and the earphone output signal becomes possible.
[0018]
In this embodiment, since the disk-shaped piezoelectric actuator 5, the piezoelectric sensor 6,
and the diaphragm 7 are coaxially fixed, divided vibration is less likely to occur, and the input /
output characteristics (frequency gain characteristics) are not deteriorated.
In addition, noise signals from the environment are reduced because the speaker's speech signal
is input from the diaphragm of the earphone.
[0019]
Fig.2 (a) is a schematic front view which shows the earphone microphone which is Example 2 of
this invention, FIG.2 (b) is AA sectional drawing in Fig.2 (a).
In this example, a disk-shaped piezoelectric actuator 5 and a ring-shaped piezoelectric sensor 8
are coaxially bonded to a disk-shaped diaphragm 7.
The piezo actuator 5, the piezo sensor 8 and the diaphragm 7 integrated in this way are covered
with a cover not shown to form an earphone microphone.
[0020]
Although not shown, the earphone output signal is applied to the piezo actuator 5 as in the first
embodiment, and the output signal from the piezo sensor 8 is output to the subtraction circuit.
The vibration transmitted to the diaphragm 7 from the piezoelectric actuator 5 and the vibration
transmitted to the diaphragm 7 from the speaker's sound generation signal are transmitted to the
piezo sensor 8 and a composite signal of these is output to the subtraction circuit.
[0021]
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The subtraction circuit subtracts the signal corresponding to the signal of the earphone output
signal from the output signal of the piezo sensor 8 and extracts the signal of the sound wave
input to the diaphragm 7 as an electric signal. In this way, simultaneous processing of the sound
output signal of the speaker with the earphone microphone and the earphone output signal
becomes possible.
[0022]
In this embodiment, since the disk-shaped piezoelectric actuator 5, the ring-shaped piezoelectric
sensor 8 and the diaphragm 7 are coaxially fixed, the divided vibration hardly occurs and the
input / output characteristics are not deteriorated. In addition, noise signals from the
environment are reduced because the speaker's speech signal is input from the diaphragm of the
earphone.
[0023]
The embodiment is configured as described above, but the invention is not limited thereto. For
example, the ring-shaped piezoelectric actuator and the disk-shaped piezoelectric sensor may be
coaxially fixed to the diaphragm.
[0024]
It is a schematic side view which shows the structure of the earphone microphone which is
Example 1 of this invention.
Fig.2 (a) is a schematic front view which shows the earphone microphone which is Example 2 of
this invention, FIG.2 (b) is AA sectional drawing in Fig.2 (a). It is a perspective view which shows
the example of the conventional earphone microphone.
Explanation of sign
[0025]
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1 earphone 2 microphone 3 code 4 connector 5 piezo actuator 6 piezo sensor 7 diaphragm 8
piezo sensor 9 earphone output signal 10 subtraction circuit
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