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DESCRIPTION JP2014160948

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DESCRIPTION JP2014160948
Abstract: To provide an earphone microphone that can be miniaturized and has an inexpensive
echo suppression function. SOLUTION: An earphone microphone is outputted from at least one of
a single speaker 21, a first and second microphones 22a and 22b, a main body case 23 in which
an acoustic space is formed, and a first and second microphones. And an output control unit
configured to amplify an audio signal to be output. The acoustic space includes a sound output
path 232, a first sound input path 233, and a second sound input path 234. In the sound
emission way, the output sound of the speaker is propagated. The first sound collecting passage
communicates with the outside of the main body case. In the first sound collecting path, the
sound input to the first microphone propagates. In the second sound collecting path, the sound
input to the second microphone propagates. The sound emission path is branched into one path
communicating with the outside of the main body case and the other path communicating with
the second sound collecting path. The earphone microphone collects the input sound from the
external sound source of the main body case and suppresses the collection of the output sound
of the speaker by amplifying the sound signal. [Selected figure] Figure 3
イヤホンマイク
[0001]
The present invention relates to an earphone microphone, and more particularly to an earphone
microphone equipped with a speaker and a microphone.
[0002]
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1
Conventionally, an earphone microphone incorporating a speaker and a microphone is known.
The user can transmit the user's voice input to the microphone while listening to the voice such
as the speaking voice output from the speaker through the earphone microphone worn on the
ear. Therefore, it is used for hands-free communication of mobile phones and the like.
[0003]
However, the voice of the speaker emitted in the ear canal of the user is reflected in the user's
eardrum and in the ear canal, etc., and is input to the earphone microphone as noise (echo
component). Therefore, the microphone built in the earphone microphone picks up the echo
component of the sound outputted from the speaker in addition to the user's sound. Therefore,
there is a problem that the echo component is mixed as noise with the voice transmitted from the
earphone microphone.
[0004]
Therefore, for example, as in Patent Document 1, an earphone microphone having an echo
cancellation function is known. The earphone microphone of Patent Document 1 incorporates
two speakers and a microphone. One speaker outputs a voice such as a speaking voice, and the
other speaker outputs a voice for canceling an echo component of the voice output from the one
speaker. The echo component of the sound output from one of the speakers and the sound of the
other speaker are input to the microphone, and the echo component is suppressed by canceling
out each other.
[0005]
Unexamined-Japanese-Patent No. 2007-201887
[0006]
However, since the earphone microphone of Patent Document 1 incorporates a plurality of
speakers in the main body case, the space for mounting the speakers and the sound path thereof
increases inside the main body case.
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Therefore, there is a problem that it is difficult to miniaturize the main body case. In addition,
there is also a problem that it is relatively expensive because of the high manufacturing cost.
[0007]
The present invention has been made in view of such circumstances, and it is an object of the
present invention to provide an earphone microphone that can be miniaturized and has an
inexpensive echo suppression function.
[0008]
In order to achieve the above object, an earphone microphone according to one aspect of the
present invention comprises one speaker, first and second microphones, a main housing in which
an acoustic space is formed, and first and second microphones. And an output control unit for
amplifying an audio signal output from at least one of the plurality of sound sources, wherein the
acoustic space communicates with a sound emission path through which the output audio of the
speaker propagates, and the outside of the main body housing, The first sound collecting path
through which the sound input to one microphone propagates and the second sound collecting
path through which the sound input to the second microphone propagates, and the sound
discharging path is outside the main body casing Bifurcated into one path communicating with
the other and the other path communicating with the second sound collecting path, and the input
sound from the external sound source of the main body case is collected by amplification of the
audio signal, and Sound output of the speaker Characterized in that win.
[0009]
According to the above configuration, the earphone microphone has one speaker.
Also, the sound emission path branches into one path communicating with the outside of the
main body casing and the other path communicating with the second sound collecting path.
Therefore, the output sound of the speaker propagates to the first microphone via one path and
the first sound collecting path, and also propagates to the second microphone via the other path
and the second sound collecting path. Furthermore, the earphone microphone amplifies the
audio signal output from at least one of the first and second microphones, thereby collecting the
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input audio from the external sound source and suppressing the collection of the output audio of
the speaker. Therefore, the earphone microphone can realize the echo suppression function of
the output sound of the speaker without requiring a plurality of speakers. Furthermore, the
earphone microphone can transmit input voice while suppressing noise derived from the output
voice of the speaker. Accordingly, it is possible to provide an earphone microphone that can be
miniaturized and has an inexpensive echo suppression function.
[0010]
In the above configuration, a sound pressure detection unit that detects a sound pressure level of
the audio signal, and an amplification factor adjustment unit that sets an amplification factor of
the audio signal based on a detection result of the sound pressure detection unit. The
amplification factor of the audio signal may be based on a first sound pressure level of a first
audio signal based on the output audio of the speaker input to a first microphone and the output
audio input to a second microphone. The difference from the second sound pressure level of the
second audio signal is smaller after amplification of the audio signal than before amplification of
the audio signal, and the difference from the external sound source input to the first microphone
One of the third sound pressure level of the first sound signal based on the input sound and the
fourth sound pressure level of the second sound signal based on the input sound input to the
second microphone to be larger than the other Is set It may be.
[0011]
According to this configuration, the amplification factor adjustment unit sets the amplification
factor of the audio signal based on the detection result of the sound pressure detection unit.
Further, by setting the amplification factor, it is possible to make the output sounds of the
speakers input to the first and second microphones mutually weak. On the other hand, the input
voices (for example, the user's speaking voice etc.) of the external sound source input to the first
and second microphones can be made not to cancel each other. Therefore, the input voice can be
transmitted while suppressing noise derived from the output voice of the speaker.
[0012]
Further, in the above configuration, in the amplification factor of the audio signal, the first sound
pressure level is substantially equal to the second sound pressure level, and one of the third and
fourth sound pressure levels is larger than the other. It may be set as
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4
[0013]
According to this configuration, by setting the amplification factor of the audio signal, it is
possible to make the output sounds of the speakers input to the first and second microphones
cancel each other.
On the other hand, the input voices (for example, the user's speaking voice etc.) of the external
sound source input to the first and second microphones can be made not to cancel each other.
Therefore, the input voice can be transmitted without mixing the output voice of the speaker as
noise.
[0014]
Furthermore, in the above configuration, the amplification factor of the audio signal is set such
that the first sound pressure level is substantially equal to the second sound pressure level, and
the difference between the third and fourth sound pressure levels is maximized. May be
[0015]
According to this configuration, by setting the amplification factor of the audio signal, it is
possible to make the output sounds of the speakers input to the first and second microphones
cancel each other.
On the other hand, the input voice (for example, the user's speech etc.) of the external sound
source input to the first and second microphones can be made the largest. Therefore, the input
voice can be transmitted without mixing the output voice of the speaker as noise.
[0016]
Further, in the above configuration, the first audio signal output from the first microphone may
be amplified more than the second audio signal output from the second microphone.
[0017]
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5
According to this configuration, the first audio signal is amplified more than the second audio
signal.
The output sound of the speaker is input from more paths in the second microphone than in the
first microphone. Therefore, normally, the first sound pressure level of the first audio signal is
smaller than the second sound pressure level of the second audio signal. Therefore, by
amplifying the first audio signal larger than the second audio signal, the echo suppression
function can be realized without increasing the amplification factor of at least one of the first and
second audio signals so much. .
[0018]
According to the present invention, it is possible to provide an earphone microphone that can be
miniaturized and has an inexpensive echo suppression function.
[0019]
It is an external appearance perspective view of an earphone microphone.
It is a figure which shows the state with which the earphone microphone was mounted | worn
with the user's external ear canal. It is sectional drawing of the main-body part in 1st
Embodiment. It is a front view of the main-body part seen from the user's ear canal side in 1st
Embodiment. It is a side view of a main part. It is a front view which shows the other example of
formation of the 2nd and 3rd opening in a 1st embodiment. It is a front view which shows the
other example of formation of the 2nd and 3rd opening in a 1st embodiment. It is a front view
which shows the other example of formation of the 2nd and 3rd opening in a 1st embodiment. It
is a block diagram showing composition of a control unit. It is a conceptual block diagram which
shows the propagation path of the output sound of the speaker input into a 1st and 2nd
microphone in 1st Embodiment. It is a sound collection block diagram of the output voice in a 1st
embodiment. It is a conceptual block diagram which shows the propagation path of the input
audio | voice from the external sound source input into a 1st and 2nd microphone in 1st
Embodiment. It is a sound collection block diagram of the input speech in a 1st embodiment. It is
a conceptual block diagram of the earphone microphone concerning 2nd Embodiment. It is a
front view of the main-body part seen from the user's ear canal side in 2nd Embodiment. It is a
front view which shows the other example of formation of the 2nd and 3rd opening in a 2nd
embodiment. It is a front view which shows the other example of formation of the 2nd and 3rd
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opening in a 2nd embodiment. It is a conceptual block diagram which shows the propagation
path of the output sound of the speaker input into a 1st and 2nd microphone in 2nd
Embodiment. It is a sound collection block diagram of the output voice in a 2nd embodiment. It is
a conceptual block diagram which shows the propagation path of the input audio | voice from
the external sound source input into a 1st and 2nd microphone in 2nd Embodiment. It is a sound
collection block diagram of the input speech in a 2nd embodiment. It is a conceptual block
diagram which shows another example of the earphone microphone which concerns on 1st
Embodiment. It is a conceptual block diagram which shows another example of the earphone
microphone which concerns on 2nd Embodiment.
[0020]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. First Embodiment (Configuration of Earphone Microphone)
[0021]
FIG. 1 is an external perspective view of an earphone microphone. The earphone microphone 1 is
a sound collection device connected to an electronic device (not shown) such as a mobile phone,
for example. As shown in FIG. 1, the earphone microphone 1 includes a main body 2, a control
unit 3, a first cable 41, a second cable 42, and a connector 5.
[0022]
The main unit 2 is attached to the user's ear, emits an output sound, and collects an input sound
from an external sound source (e.g., a user's speaking voice). The specific configurations of the
main body 2 and the control unit 3 will be described in detail later. The first cable 41 is a signal
line that is connected between the main unit 2 and the control unit 3 and that transmits and
receives signals between the main unit 2 and the control unit 3. The second cable 42 is
connected between the control unit 3 and the connector 5 and transmits / receives a signal
between the control unit 3 and an electronic device (not shown) to which the earphone
microphone 1 is connected via the connector 5 It is a line. The connector 5 is an input / output
terminal connected to an interface of an electronic device (not shown).
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7
[0023]
FIG. 2 is a view showing a state in which the earphone microphone is attached to the user's ear
canal. As shown in FIG. 2, the earphone microphone 1 is attached to the ear EAR of the user, and
emits the sound based on the audio signal output from the electronic device (not shown) toward
the eardrum E1 of the user. Further, not only the voice emitted by the user is emitted from the
mouth, but a part of the voice is transmitted from the tympanic membrane E1 to the ear canal E2
through the skull and the muscles of the face. The earphone microphone 1 picks up a voice such
as the user's voice (i.e., an input voice from an external sound source), and further generates a
voice signal based on the collected voice and outputs it to an electronic device (not shown) Do.
The electronic device to which the earphone microphone 1 is connected is not particularly
limited.
[0024]
Here, the output sound emitted from the earphone microphone 1 into the ear canal E2 of the
user is reflected by the user's eardrum E1, the ear canal E2, etc., and is input to the earphone
microphone 1 as noise. Below, this noise is called an echo component. The earphone microphone
1 has an echo suppression function for suppressing noise derived from such an echo component
as described later. Therefore, the earphone microphone 1 can collect clear sound in which noise
(in particular, an echo component of output sound) is suppressed.
[0025]
Next, the configuration of the main unit 2 will be described in detail. FIG. 3 is a cross-sectional
view of the main body in the first embodiment. FIG. 4 is a front view of the main body viewed
from the side of the user's ear canal in the first embodiment. FIG. 5 is a side view of the main
body. In addition, FIG. 3 has shown the cross-section of the main-body part 2 in alignment with
dashed-dotted line AA of FIG.
[0026]
As shown in FIG. 3, the main body portion 2 is configured to include a speaker 21, a first
microphone 22 a, a second microphone 22 b, a main body case 23, and an ear pad 25.
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[0027]
The speaker 21 is an audio output unit having a sound emission hole 21 a for outputting an
output sound.
The speaker 21 is electrically connected to the first cable 41, and outputs an output sound based
on an audio signal transmitted from an electronic device (not shown) via the connector 5.
Although the sound emission hole 21a of the speaker 21 is directed in a direction substantially
perpendicular to the direction in which the sound emission path 232 extends in FIG. 3, the
direction of the speaker 21 is not limited to the example of FIG. The orientation of the speaker 21
may be, for example, substantially parallel to the direction in which a sound emission path 232
described later extends.
[0028]
The first and second microphones 22a and 22b are voice input units, and are electrically
connected to the control unit 3 (in particular, a control circuit unit 32 described later) via the
first cable 41. The first and second microphones 22a and 22b are not particularly limited, and
for example, a MEMS microphone, an ECM microphone or the like can be used. The first
microphone 22a has a first sound collection hole 221a, and generates a first sound signal based
on the sound input to the first sound collection hole 221a. The second microphone 22b has a
second sound collecting hole 221b, and generates a second sound signal based on the sound
input to the second sound collecting hole 221b. The generated first and second audio signals are
output to the control unit 3 via the first cable 41. In FIG. 3, the first and second sound collection
holes 221a and 221b are arranged in a direction substantially parallel to the direction in which
the sound paths (for example, the sound emission path 232 and the like) described later extend.
The arrangement direction is not limited to the example of FIG.
[0029]
One speaker 21 and first and second microphones 22 a and 22 b are mounted on the main body
case 23. Further, as shown in FIGS. 3 to 5, an insertion portion 23 a is formed in the main body
case 23. In the insertion portion 23a, as shown in FIG. 4, voice is input to the earphone
microphone 1 on the surface facing the eardrum E1 of the user when the main body 2 is
attached to the user's ear EAR as shown in FIG. Second and third openings 231b and 231c for
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9
output are formed.
[0030]
The shapes of the second and third openings 231 b and 231 c formed in the insertion portion 23
a are not particularly limited. 6A to 6C are front views showing another example of forming the
second and third openings in the first embodiment. The shapes of the second and third openings
231 b and 231 c may be, for example, polygonal shapes such as a circle (FIG. 6A), a quadrangle
(FIG. 6B), and a triangle (FIG. 6C). The shapes and sizes of the second and third openings 231b
and 231c may be substantially the same or different.
[0031]
Further, as shown in FIG. 3, an acoustic space including a sound output path 232, a first sound
collection path 233, and a second sound collection path 234 is formed inside the main body
casing 23.
[0032]
The sound emission path 232 is a sound path through which the output sound of the speaker 21
propagates.
In the sound emission path 232, the speaker 21 is disposed, and a first opening 231a
communicating with the second sound collection path 234 is formed. Therefore, the sound
emission path 232 branches into one path communicating from the speaker 21 to the outside of
the main body case 23 and the other path communicating with the second sound collecting path
234 through the first opening 231 a. ing. One of the paths communicates with the second
opening 231 b, and emits the output sound output from the sound output hole 21 a of the
speaker 21 to the outside of the main body housing 23 through the second opening 231 b. The
other path propagates the output sound to the second sound collection path 234 through the
first opening 231a. A branch for connecting the sound emission path 232 and the second sound
collection path 234 between the sound emission path 232 and the second sound collection path
234 instead of the first opening 231 a shown in FIG. 3. A sound path may be formed.
[0033]
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10
The first sound collection path 233 is a sound path through which the sound input to the first
sound collection hole 221a propagates, and is in communication with the third opening 231c.
The sound from the outside of the main body case 23 propagates to the first sound collecting
path 233 via the third opening 231 c. For example, the echo component of the output sound of
the speaker 21 and the input sound from an external sound source (for example, the user's
speaking voice propagated via the eardrum E1 and the ear canal E2) are propagated. The first
sound collecting path 233 guides these voices to the first sound collecting hole 221a.
[0034]
The second sound collecting path 234 is a sound path through which the sound input to the
second sound collecting hole 221 b is propagated. In the second sound collection path 234, the
echo component of the output sound of the speaker 21 and the sound such as the input sound
from the external sound source are transmitted from the outside of the main body case 23 to the
second opening 231b, the sound emission path 232, the first opening It propagates via the part
231a. Further, the output sound is directly propagated from the speaker 21 to the second sound
collection path 234 via the sound emission path 232 and the first opening 231a. The second
sound collecting path 234 guides these voices to the second sound collecting hole 221 b.
[0035]
The ear pad 25 is formed of, for example, a resin material, a rubber material, or the like, and is
put on the insertion portion 23a. When the main body 2 is attached to the ear EAR of the user
(see FIG. 2), the ear pad 25 is inserted into the ear canal E2 of the user together with the
insertion portion 23a. At this time, the ear pad 25 seals the gap between the insertion portion
23a and the opening of the user's external ear canal E2 substantially without a gap. Therefore, it
is possible to substantially block external sound that enters from between the insertion portion
23a and the opening of the ear canal E2.
[0036]
Next, the configuration of the control unit 3 will be described. FIG. 7 is a block diagram showing
the configuration of the control unit 3. As shown in FIG. 7, the control unit 3 includes an
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operation unit 31, a control circuit unit 32, a power supply unit 33, and a housing unit 35.
[0037]
Operation unit 31 receives an input operation of the user, such as adjustment of the volume of
speaker 21, for example.
[0038]
The control circuit unit 32 controls each component of the earphone microphone 1.
As shown in FIG. 7, the control circuit unit 32 includes an output control unit 321, a sound
pressure detection unit 322, and an amplification factor adjustment unit 323.
[0039]
The output control unit 321 amplifies the first and second audio signals transmitted from the
first and second microphones 22a and 22b with a gain K1 (first amplification factor) and a gain
K2 (second amplification factor), respectively. Further, the output control unit 321 generates a
differential sound signal of the amplified first and second sound signals. The differential sound
signal is transmitted to an electronic device (not shown) to which the earphone microphone 1 is
connected via the second cable 42 and the connector 5.
[0040]
The sound pressure detection unit 322 detects the sound pressure level of the first and second
sound signals transmitted from the first and second microphones 22 a and 22 b to the control
circuit unit 32. The timing at which the sound pressure detection unit 322 detects the sound
pressure level is not particularly limited. The timing of detection may be real time or may be
every predetermined time.
[0041]
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The amplification factor adjustment unit 323 automatically sets the gains K1 and K2 used by the
output control unit 321 based on the detection result of the sound pressure detection unit 322.
The method of setting the gains K1 and K2 will be described later. The amplification factor
adjustment unit 323 may set the gains K1 and K2 based on the user input on the operation unit
31. Further, the timing at which the amplification factor adjustment unit 323 automatically sets
the gains K1 and K2 is not particularly limited. The gains K1 and K2 are automatically set so as
to satisfy Formula 1 (or Formula 3) described later in a state where the output sound of the
speaker 21 and its echo component are dominantly input to the first and second microphones
22a and 22b. Are set. Further, in a state in which the input voice (such as the user's speech) of
the external sound source is dominantly input to the first and second microphones 22a and 22b,
the gains K1 and K2 are expressed by Formula 2 (or Formula 4) described later Set automatically
to meet. Furthermore, the gains K1 and K2 may be adjusted by the user's operation input input
from the operation unit 31.
[0042]
The power supply unit 33 is a small battery that supplies drive power to the control circuit unit
32 and the other components. Examples of the power supply unit 33 include, but are not limited
to, button type batteries, lithium ion batteries, and lithium polymer batteries.
[0043]
The housing unit 35 is a housing on which the operation unit 31, the control circuit unit 32, the
power supply unit 33, and the like are mounted. Further, the operation unit 31 is disposed
outside the housing unit 35 (see FIG. 1). Further, on the opposite side of the operation unit 31, a
fastener (not shown) is provided to keep the housing unit 35 on the clothes (for example, a collar,
a pocket, etc.) of the user. (Echo suppression function of earphone microphone)
[0044]
Next, regarding the echo suppression function of the earphone microphone 1 according to the
first embodiment, the output sound of the speaker 21 is collected by the first and second
microphones 22a and 22b, and the input sound from the external sound source (for example, the
user Will be described separately in the case where the first and second microphones 22a and
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22b collect sound. ((When the output sound of the speaker is collected by the first and second
microphones))
[0045]
First, the case where the output sound of the speaker 21 is collected by the first and second
microphones 22a and 22b will be described. FIG. 8 is a conceptual block diagram showing a
propagation path of the output sound of the speaker input to the first and second microphones in
the first embodiment. Further, FIG. 9 is a sound collection block diagram of the output sound in
the first embodiment. In FIG. 8, for the sake of convenience, the sound emission direction of the
speaker 21 is directed in a direction substantially parallel to the sound emission path 232.
[0046]
As shown in FIG. 8, the output sound of the sound pressure P1 output from the speaker 21 is
emitted from the speaker 21 to the ear canal E2 via the sound emission path 232 and the second
opening 231b. The output sound emitted to the ear canal E2 is echoed by the user's eardrum E1
and the inner wall of the ear canal E2. The echo component propagates to the first sound
collecting path 233 and the sound emitting path 232.
[0047]
The echo component propagating to the first sound collecting path 233 is input to the first sound
collecting hole 221 a via the third opening 231 c and the first sound collecting path 233. As
shown in FIG. 9, the first microphone 22a generates a first audio signal of the first sound
pressure level M1 according to the first sound pressure of the echo component input to the first
sound collection hole 221a, and the control circuit Output to unit 32.
[0048]
On the other hand, the echo component propagating to the sound emission path 232 is input to
the second sound collection hole 221 b via the second opening 231 b, the sound emission path
232, the first opening 231 a, and the second sound collection path 234. Be done. In the second
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sound collection hole 221b, the output sound of the speaker 21 is directly output from the sound
emission hole 21a of the speaker 21 via the sound emission path 232, the first opening 231a,
and the second sound collection path 234. It is input. That is, the sound including the output
sound and the echo component is input to the second sound collection hole 221b. As shown in
FIG. 9, the second microphone 22b generates a second sound signal of the second sound
pressure level M2 according to the second sound pressure of the sound input to the second
sound collection hole 221b, and the control circuit unit Output to 32.
[0049]
The sound pressure detection unit 322 detects the first and second sound pressure levels M1
and M2 of the first and second audio signals transmitted to the control circuit unit 32. The
amplification factor adjustment unit 323 sets the gains K1 and K2 such that the first and second
sound pressure levels M1 and M2 detected by the sound pressure detection unit 322 satisfy the
following Expression 1. | (K1 * M1)-(K2 * M2) | ≒ 0 (Expression 1) K1 ≒ (M2 / M1) * K2
[0050]
That is, the amplification factor adjustment unit 323 approximately sets the first sound pressure
level (K1 * M1) of the amplified first audio signal and the second sound pressure level (K2 * M2)
of the amplified second audio signal. The gains K1 and K2 are set to be equal. The output control
unit 321 amplifies the first and second audio signals using the gains K1 and K2 set by the
amplification factor adjustment unit 323, and generates their differential audio signals.
[0051]
In this case, the audio level of the differential audio signal based on the amplified first and
second audio signals becomes almost zero. That is, it is possible to substantially cancel the output
sound of the speaker 21 collected by the first and second microphones 22a and 22b and the
echo component thereof. Therefore, the earphone microphone 1 can cancel the echo component
of the output sound of the speaker 21. ((When the input sound from an external sound source is
collected by the first and second microphones))
[0052]
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Next, a case where an input voice (for example, a user's speech) from an external sound source is
collected by the first and second microphones 22a and 22b will be described. FIG. 10 is a
conceptual block diagram showing a propagation path of input voice from an external sound
source input to the first and second microphones in the first embodiment. Further, FIG. 11 is a
sound collection block diagram of input voice in the first embodiment. In FIG. 10, the sound
emission direction of the speaker 21 is directed in a direction substantially parallel to the sound
emission path 232 for the sake of convenience.
[0053]
As shown in FIG. 10, when the earphone microphone 1 is attached to the user's external ear
canal E2 as shown in FIG. 2, the input sound of the sound pressure P2 (user's speaking voice etc.)
233 and the sound emission path 232 are propagated. An input voice propagating through the
first sound collecting path 233 is input to the first sound collecting hole 221 a via the third
opening 231 c and the first sound collecting path 233. As shown in FIG. 11, the first microphone
22a generates a first sound signal of the third sound pressure level N1 according to the third
sound pressure of the input sound input to the first sound collection hole 221a, and the control
circuit Output to unit 32.
[0054]
On the other hand, the input sound propagating to the sound emission path 232 is input to the
second sound collection hole 221 b via the second opening 231 b, the sound emission path 232,
the first opening 231 a, and the second sound collection path 234. Be done. As shown in FIG. 11,
the second microphone 22b generates a second sound signal of the fourth sound pressure level
N2 according to the fourth sound pressure of the input sound input to the second sound
collection hole 221b, and the control circuit Output to unit 32.
[0055]
The sound pressure detection unit 322 detects the third and fourth sound pressure levels N1 and
N2 of the first and second audio signals transmitted to the control circuit unit 32. The
amplification factor adjustment unit 323 sets the gains K1 and K2 such that the third and fourth
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sound pressure levels N1 and N2 detected by the sound pressure detection unit 322 satisfy the
following Expression 2. | K1 * N1-K2 * N2 |> 0 (Equation 2)
[0056]
That is, the amplification factor adjustment unit 323 determines the difference between the third
sound pressure level (K1 * N1) of the amplified first audio signal and the fourth sound pressure
level (K2 * N2) of the amplified second audio signal. The gains K1 and K2 are set such that is
greater than zero. The output control unit 321 amplifies the first and second audio signals by
using the gains K1 and K2 set by the amplification factor adjustment unit 323, and generates
their differential audio signals.
[0057]
In this way, the audio level of the differential audio signal based on the amplified first and second
audio signals becomes greater than zero. Therefore, it is possible to transmit input speech (such
as a user's speech) from an external sound source input to the first and second microphones 22a
and 22b without the input speech canceling each other. ((Reduction of echo component))
[0058]
In practice, in the first and second microphones 22a and 22b, the output sound of the speaker
21 and the input sound from an external sound source (such as the user's speech) are
simultaneously collected. Therefore, the gains K1 and K2 are set such that the left side of the
above equation 1 becomes smaller under the condition satisfying the above equation 2. In this
way, the earphone microphone 1 can be provided with an echo suppression function, and the
echo suppression function can transmit an input sound in which the echo component of the
output sound of the speaker 21 is suppressed to an electronic device (not shown). . Second
Embodiment
[0059]
Next, the earphone microphone 1 of the second embodiment will be described. FIG. 12 is a
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conceptual configuration diagram of an earphone microphone according to a second
embodiment. FIG. 13 is a front view of the main body as viewed from the side of the user's ear
canal in the second embodiment.
[0060]
As shown in FIGS. 12 and 13, in the second embodiment, a fourth opening 231 d is further
formed on the surface on which the second and third openings 231 b and 231 c of the insertion
portion 23 a are formed. Further, the acoustic space inside the main housing 23 further includes
a third sound collecting path 235 communicating with the second sound collecting path 234
from the outside of the main housing 23 through the fourth opening 231 d. Other than that is
the same as that of the first embodiment. Below, the same numerals are given to the same
composition as a 1st embodiment, and the explanation is omitted. (Configuration of earphone
microphone)
[0061]
As shown in FIG. 12, in the second embodiment, the sound including the sound output path 232,
the first sound input path 233, the second sound input path 234, and the third sound input path
235 in the main body case 23. Space is formed. The third sound collecting path 235 is a sound
path communicating with the second sound collecting path 234 from the fourth opening 231 d.
In the third sound collecting path 235, the echo component of the output sound of the speaker
21 and the sound such as the input sound from the external sound source propagate from the
outside of the main body case 23. The third sound collecting path 235 guides these voices to the
second sound collecting path 234.
[0062]
Further, as shown in FIG. 13, in the second embodiment, in the insertion portion 23 a, three
openings (a surface facing the eardrum E1 of the user when the main body 2 is attached to the
user's ear EAR) Second to fourth openings 231b, 231c, 231d) are formed. The shapes of the
openings 231b, 231c, and 231d formed in the insertion portion 23a are not particularly limited.
14A and 14B are front views showing another example of formation of the second and third
openings in the second embodiment. For example, the shapes of the second to fourth openings
231b, 231c, and 231d may be, for example, circular (see FIG. 14A), or may be polygonal such as
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square and triangle.
[0063]
The shapes and sizes of the second to fourth openings 231b, 231c and 231d may be
substantially the same or different. The shapes and sizes of the second to fourth openings 231b,
231c and 231d may be substantially the same or different. In addition, the second to fourth
openings 231b, 231c, and 231d may be arranged side by side in a predetermined direction as
shown in FIGS. 13 and 14A, and each of the openings 231b, 231c, and 231d as shown in FIG. It
may be arranged such that the center of is the position of the vertex of the virtual triangle. (Echo
suppression function of earphone microphone)
[0064]
Next, regarding the echo suppression function of the earphone microphone 1 according to the
second embodiment, the output sound of the speaker 21 is collected by the first and second
microphones 22a and 22b, and the input sound from the external sound source (for example, the
user Will be described separately in the case where the first and second microphones 22a and
22b collect sound. ((When the output sound of the speaker is collected by the first and second
microphones))
[0065]
First, the case where the output sound of the speaker 21 is collected by the first and second
microphones 22a and 22b will be described. FIG. 15 is a conceptual block diagram showing a
propagation path of the output sound of the speaker input to the first and second microphones in
the second embodiment. FIG. 16 is a sound collection block diagram of the output sound in the
second embodiment. In FIG. 15, for the sake of convenience, the sound emission direction of the
speaker 21 is directed in a direction substantially parallel to the sound emission path 232.
[0066]
As shown in FIG. 15, the output sound of the sound pressure P1 output from the speaker 21 is
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emitted from the speaker 21 to the ear canal E2 via the sound emission path 232 and the second
opening 231b. The output sound emitted to the ear canal E2 is echoed by the user's eardrum E1
and the inner wall of the ear canal E2. The echo component propagates to the first sound
collecting path 233, the third sound collecting path 235, and the sound emitting path 232.
[0067]
The echo component propagating to the first sound collecting path 233 is input to the first sound
collecting hole 221 a via the third opening 231 c and the first sound collecting path 233. As
shown in FIG. 16, the first microphone 22a generates a first audio signal of the first sound
pressure level M1 according to the first sound pressure of the echo component input to the first
sound collection hole 221a, and the control circuit Output to unit 32.
[0068]
On the other hand, the echo component propagating to the third sound collecting path 235 is
input to the second sound collecting hole 221 b via the fourth opening 231 d and the second
sound collecting path 234. In addition, the echo component propagating to the sound emission
path 232 is input to the second sound collection hole 221 b through the second opening 231 b,
the sound emission path 232, the first opening 231 a, and the second sound collection path 234.
Be done. Furthermore, in the second sound collection hole 221b, the output sound of the speaker
21 is directly output from the sound emission hole 21a of the speaker 21 through the sound
emission path 232, the first opening 231a, and the second sound collection path 234. It is input.
Therefore, a voice including an output voice and an echo component propagating through the
two sound paths is input to the second sound collection hole 221b. As shown in FIG. 16, the
second microphone 22b generates a second audio signal of the second sound pressure level M2
according to the second sound pressure of the sound input to the second sound collection hole
221b, and the control circuit unit Output to 32.
[0069]
The sound pressure detection unit 322 detects the first and second sound pressure levels M1
and M2 of the transmitted first and second sound signals. The amplification factor adjustment
unit 323 sets the gains K1 and K2 such that the first and second sound pressure levels M1 and
M2 detected by the sound pressure detection unit 322 satisfy the following Expression 3. | (K1 *
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M1)-(K2 * M2) | ≒ 0 (Equation 3) K1 ≒ (M2 / M1) * K2
[0070]
That is, the amplification factor adjustment unit 323 approximately sets the first sound pressure
level (K1 * M1) of the amplified first audio signal and the second sound pressure level (K2 * M2)
of the amplified second audio signal. The gains K1 and K2 are set to be equal. The output control
unit 321 amplifies the first and second audio signals by using the gains K1 and K2 set by the
amplification factor adjustment unit 323, and generates their differential audio signals.
[0071]
In this case, the audio level of the differential audio signal based on the amplified first and
second audio signals becomes almost zero. That is, the echo component of the output sound of
the speaker 21 collected by the first and second microphones 22a and 22b can be substantially
cancelled. Therefore, the earphone microphone 1 can cancel the echo component of the output
sound of the speaker 21. ((When the input sound from an external sound source is collected by
the first and second microphones))
[0072]
Next, a case where an input voice (for example, a user's speech) from an external sound source is
collected by the first and second microphones 22a and 22b will be described. FIG. 17 is a
conceptual configuration diagram showing a propagation path of input voice from an external
sound source input to the first and second microphones in the second embodiment. FIG. 18 is a
sound collection block diagram of input speech in the second embodiment. In FIG. 17, the sound
emission direction of the speaker 21 is directed in a direction substantially parallel to the sound
emission path 232 for convenience.
[0073]
As shown in FIG. 17, when the earphone microphone 1 is attached to the user's external ear
canal E2 as shown in FIG. 2, the input sound of the sound pressure P2 (user's speaking voice etc.)
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The second sound collecting path 235 and the sound emitting path 232 are propagated. An input
voice propagating through the first sound collecting path 233 is input to the first sound
collecting hole 221 a via the third opening 231 c and the first sound collecting path 233. As
shown in FIG. 18, the first microphone 22a generates a first sound signal of the third sound
pressure level N1 according to the third sound pressure of the input sound input to the first
sound collection hole 221a, and the control circuit Output to unit 32.
[0074]
Further, the input sound propagating to the third sound collecting path 235 is input to the
second sound collecting hole 221 b via the fourth opening 231 d, the third sound collecting path
235, and the second sound collecting path 234. . Also, the input sound propagating to the sound
emission path 232 is input to the second sound collection hole 221 b via the second opening
231 b, the sound emission path 232, the first opening 231 a, and the second sound collection
path 234. Be done. That is, a voice including input voices from two sound paths is input to the
second sound collection hole 221b. As shown in FIG. 18, the second microphone 22b generates a
second sound signal of the fourth sound pressure level N2 according to the fourth sound
pressure of the input sound input to the second sound collection hole 221b, and the control
circuit Output to unit 32.
[0075]
The sound pressure detection unit 322 detects the third and fourth sound pressure levels N1 and
N2 of the transmitted first and second audio signals. The amplification factor adjustment unit
323 sets the gains K1 and K2 such that the third and fourth sound pressure levels N1 and N2
detected by the sound pressure detection unit 322 satisfy the following equation 4. | (K1 * N1)(K2 * N2) |> 0 (Equation 4)
[0076]
That is, the amplification factor adjustment unit 323 determines the difference between the third
sound pressure level (K1 * N1) of the amplified first audio signal and the fourth sound pressure
level (K2 * N2) of the amplified second audio signal. The gains K1 and K2 are set such that is
greater than zero. The output control unit 321 amplifies the first and second audio signals by
using the gains K1 and K2 set by the amplification factor adjustment unit 323, and generates
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their differential audio signals.
[0077]
In this way, the audio level of the differential audio signal based on the amplified first and second
audio signals becomes greater than zero. Therefore, it is possible to transmit the input voice
(such as the user's speech) from the external sound source input to the first and second
microphones 22a and 22b without the input voices canceling each other. ((Reduction of echo
component))
[0078]
In practice, in the first and second microphones 22a and 22b, the output sound of the speaker
21 and the input sound from an external sound source (such as the user's speech) are
simultaneously collected. Therefore, the gains K1 and K2 are set such that the left side of the
above equation 3 becomes smaller under the condition satisfying the above equation 4. In this
way, the earphone microphone 1 can be provided with an echo suppression function, and the
echo suppression function can transmit an input sound in which the echo component of the
output sound of the speaker 21 is suppressed to an electronic device (not shown). .
[0079]
The embodiments of the present invention have been described above. It is to be understood by
those skilled in the art that the above-described embodiment is an exemplification, and that
various modifications can be made to the respective constituent elements and combinations of
the respective processes, and the present invention is within the scope of the present invention.
[0080]
For example, in the above-described first and second embodiments, the amplification factor
adjustment unit 323 automatically sets both gains K1 and K2 based on the detection result of the
sound pressure detection unit 322. However, the application of the present invention The scope
is not limited to this configuration. The amplification factor adjustment unit 323 may
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automatically set only one of the gains K1 and K2 based on the detection result of the sound
pressure detection unit 322. In this way, the earphone microphone 1 can realize the echo
suppression function with a simpler configuration.
[0081]
Further, in the above-described first and second embodiments, when the output sound of the
speaker 21 is collected by the first and second microphones 22a and 22b, the gains K1 and K2
are the first and second sounds after amplification. The condition is set such that the difference
between the first and second sound pressure levels of the signal | K1 * M1-K2 * M2 | is
approximately zero. However, the scope of application of the present invention is not limited to
this configuration. The gains K1 and K2 are set so that the difference | K1 * M1-K2 * M2 |
between the first and second sound pressure levels is smaller after amplification than before the
first and second audio signals are amplified. It may be set. In this way, the earphone microphone
1 can realize an echo suppression function.
[0082]
In the first and second embodiments described above, when the input sound from the external
sound source is collected by the first and second microphones 22a and 22b, the gains K1 and K2
are the first and second gains after amplification. The conditions (see Equations 2 and 4) are set
such that the difference between the third and fourth sound pressure levels of the audio signal is
greater than zero. Here, the input voice transmitted by the earphone microphone 1 becomes the
largest under the condition that the difference | K1 * N1-K2 * N2 | between the third and fourth
sound pressure levels is maximized. Therefore, it is desirable that the gains K1 and K2 be set
under the condition that the difference | K1 * N1-K2 * N2 | becomes maximum. By so doing, it is
possible to maximize the sound pressure level of the input voice from which noise derived from
the echo component of the output voice of the speaker 21 has been removed. Therefore, it is
possible to transmit the input sound input from the external sound source to the earphone
microphone 1 at the highest sound pressure level.
[0083]
Further, in the first and second embodiments described above, when the output voice and the
input voice are simultaneously collected by the first and second microphones 22a and 22b, the
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gains K1 and K2 can be expressed by Equation 2 (or Equation 4). Is set so that the left side of
Equation 1 (or Equation 3) described above becomes smaller. At this time, it is desirable that the
gains K1 and K2 be set so as to satisfy both of Equations 1 and 2 (or Equations 3 and 4)
described above. In this way, by making full use of the echo suppression function of the
earphone microphone 1, it is possible to transmit the input sound from which the echo
component of the output sound of the speaker 21 is substantially removed to the electronic
device (not shown).
[0084]
Furthermore, in such a case, the gains K1 and K2 satisfy the condition that Equation 2 (or
Equation 4) is maximized (ie, the third and fourth sound pressure levels) under the condition
satisfying Equation 1 (or Equation 3) described above. It is more desirable that the difference |
K1 * N1-K2 * N2 | In this way, the earphone microphone 1 can transmit the input sound from
which the echo component of the output sound of the speaker 21 is substantially removed to the
electronic device (not shown).
[0085]
In the first and second embodiments described above, the sound propagation path is cut off in
the sound output path 232, the first to third sound collection paths 233 to 235, and the first to
fourth openings 231a to 231d. Although no damping member is arranged, the present invention
is not limited to these configurations. FIG. 19 is a conceptual configuration diagram showing
another example of the earphone microphone according to the first embodiment. FIG. 20 is a
conceptual configuration diagram showing another example of the earphone microphone
according to the second embodiment. As shown in FIG. 19 and FIG. 20, sound that blocks or
attenuates passing sound in the sound output path 232, the first to third sound input paths 233
to 235, and the first to fourth openings 231a to 231d. The resistance member 24 may be
provided. In addition, it is not limited to the illustration of FIG.19 and FIG.20, The acoustic
resistance member 24 is the sound emission path 232, 1st-3rd sound-collection path 233-235,
and 1st-4th opening part 231a-231d. It may be provided in at least one of In this case, in
addition to the settings of the gains K1 and K2, the acoustic resistance of the acoustic resistance
member 24 can collect the input sound of the external sound source and can suppress the
collection of the echo component. Therefore, the design freedom of the earphone microphone 1
can be increased, and the echo suppression function can be realized more easily.
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[0086]
In the first and second embodiments described above, the earphone microphone 1 is provided
with one main body 2 as shown in FIG. 1, but the present invention is not limited to this
configuration. The earphone microphone 1 may be provided with two main body parts 2.
Furthermore, one of the two body parts 2 may not have an echo suppression function. In other
words, on the other hand, the speaker 21 may be mounted, but the first and second microphones
22a and 22b may not be mounted. In this way, the user can listen to the output sound of the
earphone microphone 1 with both ears.
[0087]
Further, in the first and second embodiments described above, in order to facilitate
understanding of the configuration for realizing the echo suppression function of the earphone
microphone 1, the conceptual configuration diagram and the sound collection block diagram of
the earphone microphone 1 are shown in FIGS. 11 and FIG. 12 and FIG. 15 to FIG. The
configurations shown in FIGS. 12 and 15 to 18 can be considered substantially the same as in
FIGS. 8 to 11, provided that the sound does not propagate through the third sound collecting
path 235.
[0088]
In the embodiment described above, the earphone microphone 1 includes the single speaker 21,
the first and second microphones 22a and 22b, the main housing 23 in which the acoustic space
is formed, and the output control unit 321. . The output control unit 321 also amplifies an audio
signal output from at least one of the first and second microphones 22a and 22b. The acoustic
space includes a sound emission path 232, a first sound collection path 233, and a second sound
collection path 234. The sound output from the speaker 21 is propagated to the sound emission
path 232. The first sound collecting path 233 communicates with the outside of the main
housing 23. Also, the sound input to the first microphone 22 a propagates to the first sound
collecting path 233. The sound input to the second microphone 22 b propagates to the second
sound collection path 234. Further, the sound output path 232 branches into one path
communicating with the outside of the main housing 23 and the other path communicating with
the second sound collecting path 234. The earphone microphone 1 collects an input voice (for
example, a user's speaking voice etc.) from an external sound source of the main body case 23 by
amplification of the voice signal and suppresses the collection of the output voice of the speaker
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21.
[0089]
According to this configuration, the earphone microphone 1 includes one speaker 21. Further,
the sound output path 232 branches into one path communicating with the outside of the main
housing 23 and the other path communicating with the second sound collecting path 234.
Therefore, the output sound of the speaker 21 propagates to the first microphone 22 a via one
path and the first sound collecting path 233 and the second microphone 22 b via the other path
and the second sound collecting path 234. It also propagates. Furthermore, the earphone
microphone 1 collects an input voice from an external sound source by amplifying an audio
signal output from at least one of the first and second microphones 22a and 22b, and collects the
output voice of the speaker 21. Suppress the sound. Therefore, the earphone microphone 1 can
realize the echo suppression function of the output sound of the speaker 21 without requiring
the plurality of speakers 21. Furthermore, the earphone microphone 1 can transmit input voice
while suppressing noise derived from the output voice of the speaker 21. Accordingly, it is
possible to provide the earphone microphone 1 which can be miniaturized and has an
inexpensive echo suppression function.
[0090]
Further, in the embodiment described above, the earphone microphone 1 determines the gain
(amplification factor of the audio signal) based on the detection results of the sound pressure
detection unit 322 that detects the sound pressure level of the audio signal and the sound
pressure detection unit 322. And A) an amplification factor adjustment unit 323 for setting K1
and K2. Further, the gains K1 and K2 of the audio signal are the first sound pressure level M1 of
the first audio signal based on the output audio of the speaker 21 input to the first microphone
22a and the output audio input to the second microphone 22b. The difference with the second
sound pressure level M2 of the second sound signal based on the second sound signal is set to be
smaller after amplification of the sound signal than before amplification of the sound signal.
Further, the gains K1 and K2 are based on the third sound pressure level N1 of the first sound
signal based on the input sound from the external sound source input to the first microphone
22a and the input sound input to the second microphone 22b. One of the fourth sound pressure
levels N4 of the two audio signals is set to be larger than the other.
[0091]
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According to this configuration, the amplification factor adjustment unit 323 sets the gains K1
and K2 of the audio signal based on the detection result of the sound pressure detection unit
322. Further, by setting the gains K1 and K2, it is possible to weaken the output sound of the
speaker 21 input to the first and second microphones 22a and 22b. On the other hand, the input
sounds (for example, the user's speech) of the external sound source input to the first and second
microphones 22a and 22b can be prevented from canceling each other. Therefore, the input
voice can be transmitted while suppressing the noise derived from the output voice of the
speaker 21.
[0092]
Furthermore, the gains K1 and K2 of the audio signal are such that the first sound pressure level
M1 is substantially equal to the second sound pressure level M2, and one of the third and fourth
sound pressure levels N1 and N2 is greater than the other. It is desirable to be set to be large.
[0093]
In this way, by setting the gains K1 and K2 of the audio signal, it is possible to make the output
sound of the speaker 21 input to the first and second microphones 22a and 22b cancel each
other.
On the other hand, the input sounds (for example, the user's speech) of the external sound source
input to the first and second microphones 22a and 22b can be prevented from canceling each
other. Therefore, the input voice can be transmitted without mixing the output voice of the
speaker 21 as noise.
[0094]
Further, the gains K1 and K2 of the audio signal are set such that the first sound pressure level
M1 becomes substantially equal to the second sound pressure level M2, and the difference
between the third and fourth sound pressure levels N1 and N2 becomes largest. It is more
desirable to be set.
[0095]
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In this way, by setting the gains K1 and K2 of the audio signal, it is possible to make the output
sound of the speaker 21 input to the first and second microphones 22a and 22b cancel each
other.
On the other hand, the input sound (for example, the user's speaking voice etc.) of the external
sound source inputted to the first and second microphones 22a and 22b can be made the largest.
Therefore, the input voice can be transmitted without mixing the output voice of the speaker 21
as noise.
[0096]
In the embodiment described above, it is preferable that the first audio signal output from the
first microphone 22a be amplified to a larger extent than the second audio signal output from
the second microphone 22b.
[0097]
According to this configuration, the first audio signal is amplified more than the second audio
signal.
The output sound of the speaker 21 is input from more paths in the second microphone 22b
than in the first microphone 22a. Therefore, normally, the first sound pressure level M1 of the
first audio signal is smaller than the second sound pressure level M2 of the second audio signal.
Therefore, by amplifying the first audio signal larger than the second audio signal, the echo
suppression function is realized without increasing the gains K1 and K2 of at least one of the first
and second audio signals so much. Can.
[0098]
DESCRIPTION OF SYMBOLS 1 earphone microphone 2 main-body part 21 speaker 21a sound
emitting hole 22a 1st microphone 221a 1st sound collecting hole 22b 2nd microphone 221b
2nd sound collecting hole 23 main body case 23a penetration part 231a, 231b, 231c, 231d 1stthe 1st 4 opening 232 sound emitting path 233 first sound collecting path 234 second sound
collecting path 24 third sound collecting path 24 acoustic resistance member 25 ear pad 3
control unit 31 operation unit 32 control circuit unit 321 output control unit 322 sound
pressure detection unit 323 amplification factor adjustment unit 33 power supply unit 35
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housing unit 41 first cable 42 second cable 5 connector EAR ear E1 tympanic membrane E2
outer ear canal
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