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JP2010087891

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2010087891
An object of the present invention is to clearly collect a user's speech while suppressing an
increase in the number of component parts. A mobile phone uses a microphone 19 incorporated
in its own device as a "microphone" that picks up a user's speech when in a call state, and
performs control to help the user adjust the position and attitude of the mobile phone. When
done, it is also used as an "ultrasonic sensor" to identify the distance between the user and the
diaphragm 1921. As a result, without separately providing components such as sensors, the
mobile phone specifies the distance between the user and the diaphragm 1921 using the
microphone 19 for picking up the user's voice, and the user's voice is clearly It is possible to
prompt the user to correct the position and posture of the mobile phone so that the sound is
collected. [Selected figure] Figure 4
Sound collecting device and mobile phone
[0001]
The present invention relates to a technology for picking up sound.
[0002]
A user who uses a mobile phone adjusts his / her posture and position while putting his / her
phone main body on his / her ear, and there is one disclosed in Patent Document 1 as a
technique for assisting it.
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1
In Patent Document 1, the distance between the handset and the user's mouth is detected, and
when the distance is large and the collected voice of the user's voice is unclear, the user is urged
to correct the position or posture of the handset. It is disclosed. Unexamined-Japanese-Patent No.
2003-188957
[0003]
When the configuration such as a sensor for detecting the distance is provided in the portable
telephone, the number of components of the entire apparatus inevitably increases, which is not
preferable especially for portable telephones where size reduction and weight reduction are
important. Therefore, an object of the present invention is to make it possible to clearly pick up a
user's speech while suppressing an increase in the number of component parts.
[0004]
In order to solve the problems described above, a sound collection device according to a first
configuration of the present invention includes a diaphragm, a back plate provided so as to face
the diaphragm, and the diaphragm and the back that change due to the vibration of the
diaphragm. A microphone having generation means for generating an audio signal according to a
capacitance between the plate and a sound output control means for supplying an audio signal to
a diaphragm of the microphone to emit a predetermined reference sound; After the diaphragm of
the microphone vibrates and the reference sound is emitted according to the sound signal
supplied by the sound emission control means, the diaphragm is vibrated by the reflected sound
of the reference sound and the reflected sound is collected. Measuring means for measuring a
period until the sound is generated, and a period measured by the measuring means or a user
specified by the period And the distance between said diaphragm, and judging means for judging
whether or not the range determined, characterized in that it comprises a notifying means for
notifying the determination result by the determination unit to the user.
[0005]
The sound collection device according to a second configuration of the present invention is the
sound collection device according to the first configuration, wherein the notification means
determines that the distance between the user and the diaphragm specified by the measured
period or the period is the range. If the frequency of the audio signal generated by the generation
means of the microphone belongs to the audible range and the amplitude of the audio signal is
equal to or higher than the threshold, the user and the diaphragm Informing that the distance
between them is appropriate.
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[0006]
A sound pickup apparatus according to a third configuration of the present invention is the
sound pickup apparatus according to the first or second configuration, wherein the plurality of
microphones are provided at different positions, and the measurement unit is configured to
perform the period for each of the plurality of microphones And the determination means is
based on whether each period measured by the measurement means, or whether the distance
between the user specified by those periods and each of the microphones is within a determined
range To perform the determination.
[0007]
A portable telephone according to the present invention comprises a sound collection device
according to any one of the first to third configurations, communication means for wireless
transmission and reception, sound output means, and sound corresponding to audio data
received by the communication means. Control means is provided for causing the sound emitting
means to emit sound, converting an audio signal generated by the microphone into audio data,
and transmitting the audio data from the communication means.
[0008]
According to the present invention, it is possible to clearly collect the user's speech while
suppressing the increase in the number of components.
[0009]
Next, the best mode for carrying out the present invention will be described with reference to the
drawings.
The mobile phone described below is not limited to a legal mobile phone, but includes a
phone such as PHS (Personal Handyphone System (registered trademark)) having the same
function as this, and is portable by the user, and wireless communication It refers to the whole
telephone set that performs transmission and reception using
(1) Configuration FIG. 1 is a view showing the appearance of a mobile phone 10.
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The mobile phone 10 has an operation unit 13 including a plurality of buttons and a display unit
14 for displaying various information on the front of the main body, and an antenna 16 for
wirelessly exchanging data with other communication devices. .
A sound receiving area 30 is provided above the display unit 14.
The user applies his / her ear 100 to the sound receiving area 30 when listening to a voice such
as the other party's voice. A speaker 18 described later is built in the position of the sound
receiving area 30 of the mobile phone 10, and the user listens to the sound emitted from the
speaker 18 to the external space. A sound transmission area 40 is provided below the operation
unit 13. The microphone 19 is built in at the position of the sound transmission area 40, and the
voice such as the user's voice is propagated into the portable telephone 10 through the hole HM
and collected by the microphone 19. The voice collected by the microphone 19 in this manner is
sent to the telephone of the other party. When the user grips the cellular phone 10 and places
the ear in the sound receiving area 30, the sound transmitting area 40 is located near the mouth
of the user.
[0010]
FIG. 2 is a block diagram showing the configuration of the mobile telephone 10. As shown in the
figure, the mobile phone 10 includes a control unit 11, a storage unit 12, an operation unit 13, a
display unit 14, a communication unit 15, an antenna 16, an audio processing unit 17, and a
speaker 18. , And a microphone 19. The control unit 11 includes, for example, a central
processing unit (CPU), a read only memory (ROM), and a random access memory (RAM), and
controls each unit of the mobile phone 10. The ROM stores control programs for the CPU to
execute various controls, and the CPU performs various controls using the RAM as a work area
based on the control programs stored in the ROM and the storage unit 12.
[0011]
The storage unit 12 is, for example, an EEPROM (Electrically Erasable and Programmable Read
Only Memory) or a flash memory, and stores various information such as a program in which a
procedure of processing executed by the control unit 11 is described. The operation unit 13 is
provided with various buttons such as a numeric keypad from 0 to 9 and a transmission
button for instructing transmission of a telephone number or the like, for example. Supply. The
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control unit 11 determines the content instructed by the user's operation based on the operation
signal, and performs control according to the determination result. The display unit 14 includes,
for example, a liquid crystal display and a liquid crystal drive circuit, and displays various
information in accordance with the control of the control unit 11.
[0012]
The communication unit 15 performs wireless transmission and reception. When the mobile
telephone 10 and another telephone set are in a communicable state (calling state), the
communication unit 15 receives a radio signal transmitted from a base station of a mobile
telephone network (not shown) by the antenna 16 as follows: It demodulates and demodulates
this, and outputs digital speech data obtained by demodulation to the speech processing unit 17.
When the communication unit 15 acquires voice data in digital format from the voice processing
unit 17, the communication unit 15 performs modulation, frequency conversion, and the like on
the voice data, and transmits a wireless signal via the antenna 16. Hereinafter, audio data in
digital format may be simply referred to as audio data , and audio signals in analog format
may be simply referred to as audio signals .
[0013]
The audio processing unit 17 includes, for example, a DSP (Digital Signal Processor) and an
oscillation circuit, and performs various audio processing. For example, the audio processing unit
17 performs D / A (digital / analog) conversion and amplification on audio data supplied from
the communication unit 15 and supplies an audio signal of an analog format to the speaker 18.
Further, the audio processing unit 17 subjects the audio signal supplied from the microphone 19
to amplification and A / D (analog / digital) conversion to convert into digital audio data, and
converts the converted audio data into the communication unit 15. Output to The oscillation
circuit includes a harmonic oscillator, an amplification circuit, and the like, and the audio
processing unit 17 oscillates a predetermined frequency by the oscillation circuit.
[0014]
The speaker 18 is a sound emitting means for emitting a sound such as a received sound in
accordance with the audio signal supplied from the audio processing unit 17. The microphone 19
is, for example, a silicon microphone, picks up a voice such as the user's voice, and outputs a
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voice signal representing the picked-up voice to the voice processing unit 17. The microphone
19 is a very small and lightweight microphone manufactured by MEMS (Micro Electro
Mechanical Systems) technology.
[0015]
Here, the configuration of the microphone 19 will be described. FIG. 3 is an exploded perspective
view showing the configuration of the microphone 19, and FIG. 4 is a view showing a cross
section when the sound collection element 192 is cut along the cutting line IV-IV shown in FIG.
The housing 191 is formed of ceramic in a box shape, and accommodates the sound pickup
element 192 and the signal processing circuit 193. The sound collection element 192 is a
condenser microphone provided with a diaphragm 1921, a back plate 1922, and a support
1923, and is a so-called silicon microphone. The diaphragm 1921 is a semiconductor film such
as polycrystalline silicon and vibrates in response to a sound. The diaphragm 1921 has, for
example, a circular shape, but may have a shape in which a part of the circular shape is cut out,
or the like. The back plate 1922 is supported by a support 1923 and fixedly provided to face the
diaphragm 1921 with a predetermined distance. The back plate 1922 is a semiconductor similar
to the diaphragm 1921 and is insulated from the diaphragm 1921. Also in the back plate 1922,
the shape is, for example, a circle, but it may be a shape in which a part of the circle is cut out, or
the like. The displacement of the diaphragm 1921 by an amount corresponding to the sound
pressure changes the capacitance of the sound collection element 192. That is, the sound
collection element 192 converts sound pressure into capacitance. The signal processing circuit
193 is, for example, an analog LSI (Large Scale integrated circuit), converts a change in
capacitance of the sound collection element 192 into an electrical signal, and outputs the
electrical signal as an audio signal to the audio processing unit 17. That is, the signal processing
circuit 193 is an example of a generation unit that generates an audio signal according to the
capacitance between the diaphragm 1921 and the back plate 1922, which changes due to the
vibration of the diaphragm 1921. The upper surface member 194 is a flat member whose
surface is a substantially square metal and is provided so as to close the opening of the housing
191. A hole P is provided in a part of the upper surface member 194, and the microphone 19
picks up a sound propagating inside the housing 191 through the hole P.
[0016]
The microphone 19 having the above configuration also functions as a speaker capable of
emitting an ultrasonic wave, and emits the sound according to the audio signal supplied from the
control unit 11. Specifically, when the control unit 11 causes the sound processing unit 17 to
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oscillate and supplies an electric signal (hereinafter referred to as an ultrasound signal ) for
causing the diaphragm 1921 of the microphone 19 to emit an ultrasonic wave, the diaphragm
1921 is generated. Becomes an ultrasonic transducer and vibrates, and emits an ultrasonic wave
according to the ultrasonic signal.
[0017]
FIG. 5 is a block diagram showing the functions of the control unit 11 and the audio processing
unit 17. Each function shown in the figure is realized by hardware or software of the control unit
11 and the voice processing unit 17. The oscillation unit 175 performs sound emission control
for emitting a predetermined reference sound by supplying an ultrasonic signal to the
microphone 19. The oscillation unit 175 oscillates and amplifies at a predetermined frequency fo
(here, 40 kHz) by the oscillation circuit to generate an ultrasonic signal, and supplies the
generated ultrasonic signal to the diaphragm 1921 of the microphone 19. The diaphragm 1921
vibrates in response to the supplied ultrasonic signal, and emits a reference sound which is an
ultrasonic wave.
[0018]
The collected sound acquisition unit 171 acquires a sound signal SA representing the sound
collected by the microphone 19, and supplies the acquired sound signal SA to the measurement
unit 172. Sound collection by the microphone 19 is performed when the reference sound is not
emitted by the microphone 19 (diaphragm 1921). That is, sound is collected by the microphone
19 during a period in which the above-described sound emission control is not performed by the
oscillation unit 175, and the collected sound acquisition unit 171 acquires the sound signal SA
representing the collected sound.
[0019]
The measuring unit 172 vibrates the diaphragm 1921 of the microphone 19 according to the
audio signal supplied by the oscillating unit 175 to emit the reference sound, and then the
diaphragm 1921 vibrates by the reflected sound of the reference sound and the reflection is
generated. The period until the sound is collected is measured, and the measurement result is
supplied to the determination unit 173. When the collected sound acquisition unit 171 acquires
the sound signal SA of the reflected sound of the reference sound emitted when the sound
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reception area 30 of the mobile phone 10 is applied to the user's ear, the diaphragm 1921 of the
microphone 19 The reference sound emitted from the point is reflected by the user's mouth near
the sound transmission area 40, and the reflected sound is collected by the microphone 19. That
is, the measurement unit 172 measures the propagation time of the ultrasonic waves between
the diaphragm 1921 and the user.
[0020]
The determination unit 173 specifies the diaphragm 1921 (that is, the sound transmission area
40) and the distance L between users based on the measurement result supplied from the
measurement unit 172, and determines whether the distance L is included in the determined
range It is determined whether or not it is determined, and the determination result is supplied to
the notification unit 174 and the oscillation unit 175. The determination unit 173 can obtain the
distance L between the diaphragm 1921 and the user based on the same principle as the
ultrasonic sensor. Specifically, since the reference sound and the reflected sound are ultrasonic
waves and their propagation velocity is also known, the distance L can be obtained based on the
propagation velocity and the period measured by the measurement unit 172. Note that not only
the propagation time may be used, but the phase difference between the reference sound and the
reflected sound may be referred to. If the specified distance L is the distance L1 or more and the
distance L2 or less (if L1 ≦ L ≦ L2), the determination unit 173 determines that the distance
between the user and the diaphragm 1921 is within the determined range. . On the other hand, if
the specified distance is less than L1 (L <L1) or exceeds L2 (L> L2), the determination unit 173
determines that the distance L is not within the above range.
[0021]
The notification unit 174 notifies the user of the determination result by the determination unit
173. When it is determined by the determination unit 173 that the distance L between the user
and the diaphragm 1921 is within the determined range, the notification unit 174 causes the
speaker 18 to emit an alarm sound, indicating that the distance L is appropriate. The user is
notified of the determination result of If the notification unit 174 determines that the distance L
between the user and the diaphragm 1921 is not within the determined range by the
determination unit 173, the distance L is appropriate by not emitting an alarm sound. The user is
notified of the determination result of
[0022]
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The oscillation unit 175 performs sound emission control based on the determination result
supplied from the determination unit 173. If it is determined by the determination unit 173 that
the distance L between the user and the diaphragm 1921 is not within the determined range, the
oscillating unit 175 causes the diaphragm 1921 to continuously emit the reference sound. On
the other hand, when the determination unit 173 determines that the distance L between the
user and the diaphragm 1921 is within the determined range, the oscillating unit 175 stops the
emission of the reference sound by the diaphragm 1921 of the microphone 19.
[0023]
(2) Operation The operation performed by the control unit 11 of the mobile phone 10 having the
above configuration and functions when the user adjusts the position and attitude of the mobile
phone 10 will be described according to the flowchart shown in FIG. Here, a case where this
operation is performed when the mobile phone 10 is in a call state will be described.
[0024]
At the start of a call, the user operates the operation unit 13 to input the telephone number of
the person who wishes to make a call. Then, when the user presses the call button, the user
applies the ear to the sound receiving area 30 of the mobile phone 10 to prepare for a call, and
adjusts the position and posture of the mobile phone 10 main body. When the mobile phone 10
is in a call state, the control unit 11 controls the user to make a call with the other party
(hereinafter referred to as "call control"). ) (Step S1). Specifically, the control unit 11 controls the
voice processing unit 17 to cause the speaker 18 to emit voice according to the voice data
received by the communication unit 15, and voice data according to the voice collected by the
microphone 19. Are transmitted from the communication unit 15. During a period in which such
call control is performed, the control unit 11 causes the microphone 19 to pick up voice such as
the user's voice. Hereinafter, this period is referred to as a "sound collection period". The length
of the sound collection period is stored in the ROM as a preset period, and the control unit 11
continues the sound collection period for this period. Control unit 11 performs call control based
on the sound collected by microphone 19 until a predetermined sound collection period has
elapsed (step S2; NO), and when it is determined that the sound collection period is completed
(step S2; YES) ), Go to step S3.
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9
[0025]
When the sound collection period has elapsed, the control unit 11 causes the sound processing
unit 17 to oscillate at the frequency fo to supply an ultrasonic signal to the diaphragm 1921 of
the microphone 19 and emit the reference sound which is an ultrasonic wave for a
predetermined period. (Step S3). Thus, the microphone 19 functions as a speaker, and the
diaphragm 1921 emits a reference sound of the frequency fo, which is an ultrasonic wave.
[0026]
When the control unit 11 terminates the oscillation, the microphone 19 picks up the reflection
sound of the reference sound, and the sound processing unit 17 acquires an audio signal
representing the reflection sound (step S4). Next, the control unit 11 measures a period from
when the reference sound is emitted by the diaphragm 1921 of the microphone 19 to when the
diaphragm 1921 vibrates by the reflected sound of the reference sound and the reflected sound
is collected. Then, the control unit 11 specifies the distance L based on the measured period and
the propagation time of the ultrasonic wave (reference sound and reflection sound) between the
user and the diaphragm 1921 (step S5).
[0027]
Then, the control unit 11 determines whether the distance L is within the determined range (step
S6). The case where the distance between the user and the diaphragm 1921 is appropriate
means the case where the relationship of L1 ≦ L ≦ L2 is satisfied, and the user's speech is
clearly picked up by the microphone 19. For example, if the distance L is large enough to exceed
L2, the user's mouth and the microphone 19 are too far apart, the volume (amplitude) of the
collected voice tends to be small, and the user's speech is difficult to be clearly captured . On the
other hand, when the distance L is smaller than L1, the sound transmitting area 40 (microphone
19) for the user's mouth is deviated from the appropriate position, and the reference sound
emitted by the microphone 19 is, for example, the user's cheek. It is considered that there is a
high possibility that the control unit 11 has identified a distance to a site other than the user's
mouth, being blocked by a site such as a jaw or the like. In this case, the position and orientation
of the mobile phone 10 are not optimally adjusted, and it can be said that it is difficult for the
user's speech to be collected clearly. Based on such knowledge, the condition as to whether the
distance between the user and the diaphragm 1921 is appropriate is predetermined for the
distance L, and is stored in the ROM at the manufacturing stage.
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[0028]
When the control unit 11 determines YES in step S6, the control unit 11 causes the speaker
18 to emit an alarm sound to notify the user of a determination result indicating that the distance
L is appropriate (step S7). Upon hearing the alarm sound, the user recognizes that the distance L
is appropriate, and makes a call while maintaining the position and posture of the mobile phone
10 as it is. As a result, the user's speech can be clearly picked up by the microphone 19 and can
be easily heard by the other party. As described above, since the adjustment of the position and
orientation of the mobile phone 10 by the user is completed, the control unit 11 performs the
same call control as in step S1 as long as the call state is continued. That is, the control unit 11
continues the sound collection period, and causes the microphone 19 to collect the voice such as
the user's speech.
[0029]
When the control unit 11 determines NO in step S6, it notifies that the distance L is not
appropriate by not emitting an alarm sound from the speaker 18 (step S8). Then, the control unit
11 returns to step S1. If it returns to step S1, the control part 11 will start a sound collection
period, will perform telephone call control, and a user can call again with the other party. The
control unit 11 performs call control until the sound collection period elapses. And if a sound
collection period passes (step S2; YES), control part 11 will perform the above-mentioned
processing step S3-S8 like the above. Thus, the control unit 11 performs processing steps to
assist the user in adjusting the position and orientation of the mobile phone 10 until the distance
L between the user and the diaphragm 1921 falls within the above range (L1 ≦ L ≦ L2). The
control of S1 to S8 is repeated. While the user can not hear the alarm sound, the user recognizes
that the distance L between the two is undesirable, and adjusts the position and posture of the
mobile phone 10.
[0030]
Incidentally, a period in which step S1 → step S2: NO → step S1... Is repeated is referred to as a
sound collection period , and in this sound collection period, the microphone 19 performs
sound collection . On the other hand, in steps S3 to S9, the control unit 11 specifies the
distance L using the microphone 19 as an "ultrasonic sensor", and performs control according to
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whether or not the distance L between the two is appropriate. The The period in which the
control unit 11 executes the process steps S3 to S8 is hereinafter referred to as a "distance
identification period".
[0031]
FIG. 7 is a diagram for explaining the transition of the sound collection period and the
distance identification period . In the figure, the horizontal axis represents time. As shown in
FIG. 7, when the control unit 11 performs "call control" in which sound is collected by the
microphone 19 in a sound collection period of a predetermined length T1, then, during a
distance identification period of a predetermined length T2, The distance L is specified using the
microphone 19 as an ultrasonic sensor. After that, the control unit 11 alternately repeats the
sound collection period and the distance identification period, and performs control according to
each period. Then, at time T, when the control unit 11 determines that the distance L is
appropriate, thereafter, the control unit 11 continues the sound collection period as long as the
call state is continued, and the call control causes the microphone 19 to pick up sound. I do. As
described above, during the distance identification period, the control unit 11 uses the
microphone 19 as an ultrasonic sensor, so that the call control is not performed. However, even
if the distance detection period using the ultrasonic sensor is considered, the distance specifying
period required for control relating to the specification of the distance L may be a very short
minute period with respect to the sound collecting period (T2 << T1 ), Does not interfere with the
user's call. Thus, the control unit 11 can perform control to help the user adjust the position and
orientation of the mobile phone 10 without interrupting the user's call.
[0032]
As described above, the mobile phone 10 uses the microphone 19 incorporated in its own device
as a "microphone" that picks up the user's voice in a call state, and the user adjusts the position
and attitude of the mobile phone 10 When performing an operation to assist the user, it is used
as an "ultrasonic sensor" to specify the distance between the user and the diaphragm 1921. Thus,
without separately providing components such as a distance detection sensor, the mobile phone
10 specifies the distance between the user and the diaphragm 1921 using the microphone 19
that picks up the user's speech, and the user's speech is It is possible to urge the user to correct
the position and posture of the mobile phone 10 so that the sound is collected clearly. In
addition, since the microphone 19 is small and lightweight, the user does not feel discomfort
such as heavy feeling.
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[0033]
(3) Modifications The above embodiment may be modified as follows. Specifically, the following
modifications may, for example, be mentioned. These modifications can also be combined
appropriately. (3-1) Modified Example 1 In the above-described embodiment, the mobile phone
10 determines whether the distance L between the user and the diaphragm 1921 is appropriate
based on only the distance L between the user and the diaphragm 1921. However, even if the
distance L satisfies the condition of L1 ≦ L ≦ L2, it is conceivable that the distance to another
part of the user's face accidentally meets this condition, and in such a case, the microphone In
some cases, the voice of the user may not be picked up clearly. Therefore, in order to increase the
accuracy for making the distance between the user and the diaphragm 1921 appropriate, the
configuration of the mobile phone 10 may be as follows.
[0034]
For example, the control unit 11 may notify that the distance L between the two is appropriate
only when the amplitude of the voice such as the user's voice collected by the mobile phone 10
in the sound collection period is equal to or greater than the threshold. Good. As described above,
the purpose of specifying the distance L by the control unit 11 is to allow the microphone 19 to
clearly pick up the voice, so that the amplitude of the collected voice is temporarily If the volume)
is smaller than the threshold, the user's voice does not reach the microphone 19 sufficiently, and
it can not be said that the voice is collected clearly. Therefore, the control unit 11 determines
that the distance L specified in the distance specifying period is included in the predetermined
range (L1 ≦ L ≦ L2), and the amplitude of the sound collected in the sound collecting period is
equal to or greater than the threshold. It reports that the distance L is appropriate. In this way, it
is possible to make it easier for the microphone 19 to pick up the sound more clearly. In this
configuration, since the control unit 11 makes the determination based on the volume of the
user's voice, the frequency of the audio signal collected by the microphone 19 belongs to the
audible range, and the amplitude of the audio signal is at least the threshold. In this case, it is
informed that the distance between the user and the diaphragm 1921 is appropriate. The audible
range refers to the frequency band of sound waves that can be heard by humans as sounds, and
the non-audible range refers to a frequency band that is not the audible range. Generally, there
are individual differences between the audible and inaudible regions, which are not constant.
However, in this case, it is only necessary to pick up voice so that the other party can clearly hear
the user's speech, so that the frequency band that refers to the amplitude may be included
somewhere in the audible range. Therefore, a frequency band determined in advance may be
stored in the ROM as an audible range, and the control unit 11 may make the above
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determination based on the amplitude of this frequency band. Also, the control unit 11 may make
the above determination based on the amplitudes of a plurality of different frequency bands.
[0035]
(3-2) Modified Example 2 In the above-described embodiment, only one microphone 19 is built
in at the position of the sound transmission area 40 of the mobile phone 10. However, the same
plural microphones are different from those of the mobile phone 10. It may be prepared in
position. In this case, the control unit 11 specifies the distance for each of the plurality of
microphones, and the distance L is appropriate based on whether the distance between the
specified positions is within the predetermined range determined for each of the microphones.
Determine if it is or not. FIG. 8 shows a cellular phone 10a in which the microphones 19a to 19f
are provided at a plurality of positions on the front surface of the main body. The microphones
19a to 19f are provided to specify the distance to each part of the face such as the user's cheek
or jaw. Also in this case, similarly to the microphone 19, the microphone may be built in each
position of the mobile phone 10a.
[0036]
The control unit 11 specifies the distance from each microphone to each part of the user's face,
and comprehensively determines the results to determine whether the distance between the user
and the diaphragm 1921 is appropriate. Although there are individual differences in human
contours, if the position and posture of the mobile phone 10a are properly adjusted, it is
considered that individual differences from each microphone to each part of the user's face do
not differ significantly. Based on such a reason, the control unit 11 determines whether the
distance at each position identified by each of the plurality of microphones is within a range
determined for each position. Then, when the control unit 11 determines that the number of
distances equal to or larger than the threshold among the specified distances is included in the
predetermined range, the distance between the user and the diaphragm 1921 (the sound
transmission area 40) is appropriate. Informs that there is something. In this case, in order for
the control unit 11 to notify that the distance L is appropriate, a microphone which should be
always included in the range may be determined, and it is determined whether the distance L is
appropriate or not. The conditions for judgment are not limited to those described herein. As a
result, the microphone 19 can more clearly capture the user's speech clearly. Here, although the
configuration in which the six microphones 19a to 19f are provided in the mobile phone 10a has
been described, the number may be more or less than that.
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[0037]
(3-3) Modified Example 3 In the embodiment described above, the control unit 11 executes an
operation to help the user adjust the position and orientation of the mobile phone 10 in the call
state, but this operation is performed The time to do may be another time. For example, the
control unit 11 may be triggered by the pressing of a predetermined button. In this case, when
an operation signal indicating pressing of a button is acquired, the control unit 11 performs
control similar to that of the embodiment in the order of the above-described processing steps S1
to S8. However, when the mobile phone 10 is not in a call state, the control unit 11 does not have
to perform call control, so only the control according to the distance identification period (that is,
steps S3 to S8) is performed until the call state. Do.
[0038]
Further, in the above-described embodiment, the control unit 11 specifies the distance L between
the user and the diaphragm 1921 and is appropriate depending on whether the distance L falls
within the range of the distance L1 or more and the distance L2 or less. It was judged whether
there was any. On the other hand, the control unit 11 may make the determination based on the
period measured by the measurement unit 172 without specifying the distance L. Because the
propagation speed of the ultrasonic wave is substantially determined by the medium (in this case,
air) which propagates it, the distance L is large if the measured period is long, and the distance L
is small if the period is short. In this case, if the length of the measured period is included in the
predetermined range, the control unit 11 notifies that the distance L is appropriate, and the
length is included in the predetermined range. If not, it is informed that the distance L is not
appropriate.
[0039]
(3-4) Modification 4 In the embodiment described above, the control unit 11 executes an
operation that helps the user adjust the position and orientation of the mobile phone 10 in the
call state, but this operation is performed The time to do may be another time. For example, the
control unit 11 may be triggered by the pressing of a predetermined button. In this case, when
an operation signal indicating pressing of a button is acquired, the control unit 11 performs
control similar to that of the embodiment in the order of the processing steps S1 to S8 described
above. However, when the mobile phone 10 is not in a call state, the control unit 11 does not
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have to perform the call control, so it is preferable to perform only the control according to the
distance specifying period until the call state is reached.
[0040]
(3-5) Modification 5 In the embodiment described above, the control unit 11 outputs an alarm
sound by the speaker 18 to notify the user that the distance L is appropriate, and the speaker 18
emits the alarm sound. The user is informed that the distance L is not appropriate by not
sounding. The notification aspect of such a judgment result is not limited to the aspect described
in the embodiment. For example, the control unit 11 may emit an alarm sound continuously
when the distance L is not appropriate, and may stop the emission of the alarm sound when the
distance L becomes appropriate. In addition, the control unit 11 may emit an alarm sound
according to each determination result, and any kind of sound may be used. In addition, the
control unit 11 may notify the determination result by using a vibration function of the mobile
phone or by emitting light such as an LED (Light Emitting Diode).
[0041]
In the embodiment, when the distance L satisfies L1 ≦ L ≦ L2, the control unit 11 determines
that the distance L is appropriate. However, for example, it is appropriate if the distance L is
equal to or less than a threshold It may be determined that the value may be appropriately set as
needed. In the embodiment, the control unit 11 oscillates the frequency fo and emits the
reference sound which is an ultrasonic wave by the microphone 19. However, any frequency may
be used for this frequency, and a frequency range where the distance L can be specified Can be
used.
[0042]
(3-6) Modification 6 In the embodiment described above, the case where the sound collection
device of the present invention is applied to a mobile phone has been described, but sound
collection is performed for a home telephone, a single microphone, a headset, a transceiver, etc.
The present invention can be applied to a sound collection device for collection of sound. In
short, it has a microphone having the same function as that of the microphone 19 and functions
as a sound collection device having a configuration for specifying the distance between the user
and the diaphragm using sound generated by the diaphragm of the microphone vibrating. I hope
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16
there is.
[0043]
Also, each function realized by the control unit 11 and the voice processing unit 17 of the mobile
phone 10 described above may be realized by a combination of a plurality of programs or may be
realized by cooperation of a plurality of hardware resources. When each function is executed by
a program, the program may be a magnetic recording medium (magnetic tape, magnetic disk,
etc.), an optical recording medium (optical disk (CD, DVD), etc.), a magneto-optical recording
medium, a semiconductor memory, etc. It can provide in the state recorded on the computer
readable recording medium. It is also possible to download via a network such as the Internet.
[0044]
It is a figure showing the appearance of a mobile phone. It is a block diagram which shows the
structure of a mobile telephone. It is an exploded perspective view showing the composition of a
microphone. It is a sectional view showing the composition of a microphone. It is the block
diagram which showed the function of the control part and the audio processing part. It is the
flowchart which showed the procedure of the operation which a control part performs. It is a
figure explaining the mode of a transition of a "sound collection period" and a "distance specific
period." It is a figure showing the appearance of a mobile phone.
Explanation of sign
[0045]
10, 10a: mobile phone, 11: control unit, 12: storage unit, 13: operation unit, 14: display unit, 15:
communication unit, 16: antenna, 17: voice processing unit, 171: collected sound acquisition
unit, 172: measuring unit, 173: judging unit, 174: notifying unit, 175: oscillating unit, 18:
speaker, 19: microphone, 191: housing, 192: sound collecting element, 1921: diaphragm, 1922:
back plate, 1923 ... Support body 193 Signal processing circuit 194 Upper surface member 30
Sound receiving area 40 Sound transmitting area
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