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JP2002125298

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DESCRIPTION JP2002125298
[0001]
The present invention relates to a microphone device and an earphone microphone device using
a bone conduction microphone, and more particularly to improvement of output sound quality.
[0002]
2. Description of the Related Art A bone conduction microphone has been put into practical use,
in which a piezoelectric element or the like is brought into contact with a bone on the cheek or
the ear canal to pick up bone vibration caused by the user's speech. A bone conduction
microphone is often used when using a transceiver or a mobile phone in a noisy place or the like
because the microphone does not respond to anything other than the voice of the wearer due to
its structure.
[0003]
However, as described above, since the bone conduction microphone picks up the vibration of
the bone with a piezoelectric element, the frequency characteristic is different from that of a
commonly used condenser microphone etc. There was a case that I felt something strange such
as "the voice is different from usual". Under the circumstances, it has been conventionally
proposed that a speech sound signal input from a bone conduction microphone is passed
through a filter to cut unnecessary frequency components or the frequency characteristic is
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corrected by an equalizer.
[0004]
However, in the above-described conventional method, the frequency characteristics of the input
audio signal are adjusted because it is unknown how to adjust the frequency characteristics of
the signal input from the bone conduction microphone so that it becomes easy to hear as a
normal audio signal. It was not possible to judge whether the characteristics were correctly
converted, and there was a possibility that they were converted to frequency characteristics far
from the original voice.
[0005]
An object of the present invention is to provide a microphone device and an earphone
microphone device capable of outputting an audio signal having no sense of incongruity by
converting frequency characteristics in accordance with a reference audio signal.
[0006]
SUMMARY OF THE INVENTION The present invention comprises a bone conduction microphone
for converting bone vibration due to the voice of the wearer's speech into an electrical signal, and
an equalizer for adjusting the frequency characteristic of the signal converted by the bone
conduction microphone. In the microphone device which outputs the signal output from the
equalizer to the next stage as a speech sound signal, a microphone for setting which converts
external air vibration due to the speaker's speech into the electric signal, and a bone conduction
microphone in the setting mode The converted signal is compared with the signal converted by
the setting microphone, and based on the comparison result, the frequency characteristic of the
signal output from the equalizer approaches the frequency characteristic of the signal converted
by the setting microphone. And setting means for setting the characteristics.
The present invention comprises a bone conduction microphone that converts bone vibration due
to the speaker's speech into an electrical signal, and an equalizer that adjusts the frequency
characteristics of the signal converted by the bone conduction microphone, and the speech
output from the equalizer is speech speech In the microphone device that outputs to the next
stage as a signal, the setting microphone converts the external air vibration due to the voice of
the wearer into the electric signal, and the signal output from the equalizer in the setting mode
and the setting microphone convert Setting means for comparing the signal with the signal and
setting the characteristic of the equalizer so that the frequency characteristic of the signal output
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from the equalizer approaches the frequency characteristic of the signal converted by the setting
microphone based on the comparison result It is characterized by
The present invention is characterized in that the setting microphone and the setting means are
attached only in the setting mode. According to the present invention, there is provided a built-in
speaker including the above microphone device, the bone conduction microphone provided in an
earpiece to be inserted into the ear canal of a wearer, and outputting an audio signal input to the
earpiece as sound. It is characterized by
[0007]
In the present invention, the voiced speech is picked up by the bone conduction microphone that
is strong in a noisy environment. The bone conduction microphone has a frequency
characteristic different from that of a condenser microphone generally used in a transceiver, a
mobile phone, etc. Therefore, the frequency characteristic of the picked up signal is adjusted by
an equalizer and output to a subsequent stage (transceiver, mobile phone, etc.). The
characteristics of the equalizer adjust the frequency characteristics of the signal input from the
bone conduction microphone (the bone conduction microphone converted to an electrical signal)
to be close to the frequency characteristics of speech input from normal use such as a condenser
microphone Set to such characteristics. In this setting, the same speech sound is input to both the
bone conduction microphone and the setting microphone (such as a condenser microphone) in
the setting mode, and the setting unit performs the setting based on the sound. As a result, the
uttered voice input from the bone conduction microphone is transmitted to the subsequent stage
with substantially the same sound quality as the sound input from the condenser microphone or
the like, which is usually used, and the call partner does not feel discomfort. And since it is a
bone conduction microphone, it is possible to make a high quality call without picking up noise
even in a noisy environment.
[0008]
DESCRIPTION OF THE PREFERRED EMBODIMENTS A microphone device according to an
embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a
block diagram of the microphone device. This microphone device has a vibration sensor 1 which
is a bone conduction microphone, an amplifier 2, an equalizer 3 and an output terminal 4. The
vibration sensor 1 is inserted into the ear canal of the wearer, and contacts the bone of the ear
canal from above the skin to detect the vibration of the bone. The vibration sensor 1 is composed
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of a piezoelectric element, and converts this vibration into an electric signal (voltage fluctuation)
and outputs it. This electrical signal is amplified by the amplifier 2 and input to the equalizer 3.
The equalizer adjusts the frequency characteristic of the electrical signal and outputs it from the
output terminal 4 to a device (such as a transceiver or a mobile phone) in the subsequent stage.
[0009]
Further, this microphone device has an external microphone 6 which is a setting microphone, an
amplifier 7 and a comparison controller 8 in order to set the characteristics of the equalizer. The
external microphone 6 is formed of a general condenser microphone, and is used to receive the
voice of the wearer. The audio signal input from the external microphone 6 is amplified by the
amplifier 7 and input to the comparison controller 8. The comparison controller 8 also receives
the signal of the vibration sensor 1 amplified by the amplifier 2.
[0010]
The comparison controller 8 operates when the setting mode is set. The user sets the mode to
the setting mode at a place with little noise (indoor or the like), inserts the vibration sensor 1
which is a bone conduction microphone into the external ear canal, and speaks as a speech voice
is input to the external microphone 6 . As a result, both the audio signal input from the vibration
sensor 1 and the audio signal input from the external microphone 6 are input to the comparison
control unit 8. The comparison control unit 8 analyzes the frequency of these two signals to
determine the frequency spectrum, and obtains the difference between them. Then, an equalizing
characteristic that cancels this difference is set in the equalizer 3.
[0011]
FIG. 2 is a diagram showing the signal input from the vibration sensor 1, the signal input from
the external microphone 6, and the equalizing characteristics set in the equalizer 3. The signal
input from the vibration sensor 1 which is a bone conduction microphone has a level slightly
lower in the high frequency range than the signal which is input from the external microphone 6
which is a condenser microphone. Characteristics are set.
[0012]
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As a result, the characteristics of the equalizer 3 can be automatically adjusted, and the
frequency characteristics of the speech sound detected by the vibration sensor 1 are adjusted so
as to approach the frequency characteristics of the external microphone 6 as a comparison
reference. Can be
[0013]
The external microphone 6, the amplifier 7, and the comparison controller 8 may be built in the
microphone device and always connected, or may be connected to the amplifier 2 or the
equalizer 3 only in the setting mode.
When the comparison controller 8 is connected to the amplifier 2 or the equalizer 3, the
microphone device (equalizer 3) may be set to the setting mode.
[0014]
In the above embodiment, the detection signal of the vibration sensor 1 and the detection signal
of the external microphone 6 are compared, and the equalizer 3 is set based on the comparison
result. Alternatively, the equalizer 3 may be set based on the comparison result of the output of
the external microphone 6 and the detection signal of the external microphone 6.
[0015]
FIG. 3 is a view showing an example in which the present invention is applied to an earphone
microphone.
The earphone microphone is integrally provided with an earphone (speaker) and a bone
conduction microphone, and is mounted on the external ear canal. While the voice is output from
the speaker to the external ear canal, the bone conduction microphone detects speech vibration.
In the figure, an earplug 11 is provided at the tip of the case 10. A speaker 12 and a vibration
sensor 1 which is a bone conduction microphone are built in the case 10. The speaker 12 is
spatially connected to the ear canal via ports 10 a and 11 a opened at the center of the case 10
and the earplug 11. The vibration sensor 1 is also connected to the earplug 11 via the actuator
1a, and detects bone vibration via the earplug 11 and the actuator 1a. As described above, by
incorporating the speaker 12 and the vibration sensor 1 in the earphone, both the transmission
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and the reception can be performed by inserting the earphone into the ear canal.
[0016]
The applications of the microphone device and the earphone microphone device of the present
invention are not limited to communication applications such as transceivers and mobile phones,
and can be applied to all applications for transmitting the user's speech.
[0017]
As described above, according to the present invention, even if a bone conduction microphone
using a piezoelectric element or the like is used, an utterance voice signal having substantially
the same sound quality as that of a condenser microphone usually used can be output. There is
no sense of discomfort to the other party.
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