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DESCRIPTION JP2013025281

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DESCRIPTION JP2013025281
Abstract: To cancel noise caused by wind and realize high-quality sound recording without
adding any special parts. A control unit (CPU) 12 detects a pressure change (wind pressure
change) from a sound hole with a speaker (piezoelectric) 11 during moving image shooting, and
a microphone (for call) 9 and a microphone (for recording) 10 A noise canceller signal in the
reverse phase to the noise is generated based on the voice and the pressure change (wind
pressure change) from the speaker (piezoelectric) 11, and the noise canceler signal
corresponding to the reverse phase is generated through the voice processing unit 8. Sound is
emitted from the speaker (piezoelectric) 11. The speaker (piezoelectric) 11 outputs a sound that
cancels the noise captured by the microphone (for communication) 9 and the microphone (for
recording) 10. [Selected figure] Figure 1
Electronic device, noise processing method, and program
[0001]
The present invention relates to an electronic device, noise processing method, and program that
can be used for electronic devices such as mobile phones and can reproduce good speech quality
even in an outdoor environment.
[0002]
In recent years, with the growing demand for mobile phones, device manufacturers are working
on developing thin and stylish mobile phones equipped with video phones, video playback, and
hands-free phone functions.
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Among these, the demand for the sound function is large, and in particular, the demand for highquality speech is high.
[0003]
Conventionally, in a mobile phone, there are a normal call using a handset and a hands-free call
in which a call is made without holding the phone manually. When considering the convenience
of a mobile phone that can be used anytime and anywhere, not only indoor use but also outdoor
use is required. In the outdoor use, there is a problem that noise due to the call becomes difficult
to hear due to wind noise and noise from the surroundings. Therefore, it is conceivable to
incorporate a noise canceller that detects an external wind pressure and cancels the wind
pressure.
[0004]
For example, Patent Literatures 1 and 2 disclose techniques relating to a wind pressure sensor
that measures weak wind pressure. Further, in Patent Document 3, a sound receiving plate
comprising a piezoelectric element for generating a voltage according to the sound pressure from
the outside is provided, and a current according to the voltage generated by the sound receiving
plate is supplied to the resistor to A technology for providing a speaker, a sound wave output
circuit, etc. that consumes as heat, detects a sound that has passed through the sound receiving
plate, and outputs a sound wave with the same amplitude in the reverse phase as the passed
sound. Is disclosed.
[0005]
JP-A-2002-148273 JP-A-59-218961 JP-A-6-308969
[0006]
However, in the above-mentioned prior art, in order to cancel noise due to wind, it is necessary to
add a special part, and there is a problem that it is difficult to realize in a mobile phone which
must be miniaturized.
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[0007]
Therefore, an object of the present invention is to provide an electronic device, a noise
processing method, and a program capable of realizing high-quality sound recording by
canceling noise due to wind without adding a special part.
[0008]
The electronic device according to the present invention records a video taken by the imaging
unit as a video with sound while collecting a voice by the microphone, and displays a video of the
video with sound being reproduced by the display unit, and the sound being reproduced is being
reproduced. An electronic apparatus for outputting an audio of an attached video through a
speaker, wherein the apparatus for detecting a change in wind pressure detects the change in
wind pressure by the speaker when recording an image with audio, an audio collected by the
microphone, and Noise canceller signal generation means for generating a noise canceller signal
for removing noise contained in the sound collected by the microphone based on the detected
wind pressure change, and noise canceller signal generated by the noise canceller signal
generation means Control means for emitting a sound from the speaker It is an electronic device
that.
[0009]
According to the noise processing method of the present invention, a microphone for collecting
voice, a shooting unit for shooting a video by a shooting unit, a display unit for displaying a video
with a voice-added video being played back, and a voice of a video with voice being played back
Method of processing noise in an electronic device comprising a speaker for outputting a wind
pressure change detection step of detecting a wind pressure change by the speaker at the time of
video recording with audio, sound collected by the microphone, and the wind pressure change
detection A noise canceller signal generation step of generating a noise canceller signal for
removing noise contained in the sound collected by the microphone based on a wind pressure
change detected in the step; and a noise canceller signal generated in the noise canceller signal
generation step Controlling the corresponding sound to be emitted from the speaker A noise
processing method characterized.
[0010]
A program according to the present invention outputs a voice of a video with audio being played
back, a microphone which picks up a voice, a shooting unit which shoots a video by the shooting
unit, a display unit which displays a video of a video with voice being played back, To the
computer of the electronic device including the speaker, the wind pressure change detection
function of detecting the wind pressure change by the speaker, the voice collected by the
microphone, and the wind pressure change detected in the wind pressure change detection step.
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A noise canceller signal generation function for generating a noise canceller signal for removing
noise contained in the voice collected by the microphone, and a sound corresponding to the noise
canceller signal generated by the noise canceller signal generation function is emitted from the
speaker It is a program characterized by executing a control function to be performed.
[0011]
According to the present invention, noise due to wind can be canceled and high-quality sound
recording can be realized without adding a special part.
[0012]
FIG. 1 is a block diagram showing the configuration of a mobile phone 1 according to an
embodiment of the present invention.
It is a mimetic diagram showing the appearance composition of the mobile phone by this
embodiment.
It is a flowchart for demonstrating the operation | movement of the mobile telephone 1 by this
embodiment.
FIG. 5 is a configuration diagram of Supplementary Note 1;
[0013]
The present invention detects the air volume in real time by detecting a pressure change from
the sound hole using a speaker composed of a piezoelectric element disposed on the same
surface (in the vicinity) as a microphone for moving image recording. It is characterized in that
high-quality sound recording is realized by outputting the sound of the phase opposite to the
noise from the speaker so as to cancel the noise during the input recording.
[0014]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
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[0015]
FIG. 1 is a block diagram showing the configuration of a mobile phone 1 according to an
embodiment of the present invention.
In the figure, the mobile phone 1 includes a communication unit 2, an imaging unit 3, a ROM 4, a
RAM 5, a touch panel 6, a display unit 7, a voice processing unit 8, a microphone (for call) 9, a
microphone (for recording) 10, and a speaker (piezoelectric) Element 11 is provided.
[0016]
The communication unit 2 performs voice communication and data communication via a
telephone network.
The photographing unit 3 includes a lens group such as a focus lens and a zoom lens, and an
imaging device (CCD etc.), adjusts autofocusing, aperture, zooming etc according to the control
signal from the imaging control unit 3 The light of the subject projected through is converted
into an electrical signal and output as an imaging signal.
The photographing unit 3 is capable of photographing moving pictures in addition to still
pictures.
The present embodiment provides a technique for suppressing noise due to wind or the like at
the time of moving image shooting.
[0017]
The ROM 4 stores programs necessary for control of each unit of the mobile phone 1 by the
control unit (CPU) 12 and data necessary for control of each unit.
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The RAM 5 is used as a buffer memory for temporarily storing image data captured by the
imaging unit 3 and moving image data, and is also used as a working memory of the control unit
(CPU) 12.
[0018]
The touch panel 6 is provided on the display unit 7 and is used to touch an operation instruction,
data input, and the like according to the display displayed on the display unit 7.
The display unit 7 includes a color LCD and its drive circuit, and displays a captured image by the
imaging unit 3, a moving image, and various information related to communication / call.
[0019]
The voice processing unit 8 supplies the voice from the microphone (for call) 9 to the control
unit (CPU) 12, processes the voice signal, and outputs it from the speaker (piezoelectric) 11
during a call. Further, at the time of moving image shooting, the audio processing unit 8
performs stereo recording (including noise) of voice using a microphone (for call) 9 and a
microphone (for recording) 10, and a speaker (piezoelectric). 11) takes in a change in pressure
(wind pressure) from the sound hole and supplies it to the control unit (CPU) 12.
[0020]
The control unit (CPU) 12 is a one-chip microcomputer that controls each unit of the mobile
phone 1. In particular, in the present embodiment, the control unit (CPU) 12 receives a change in
pressure (wind pressure) from the speaker (piezoelectric) 11, a microphone (for call) 9 and a
microphone (for recording) 10 during moving image shooting. Based on the audio signal, wind
pressure (or air volume) is regarded as positive phase noise, and a sound of reverse phase is
emitted from the speaker (piezoelectric) 11 to the noise, and the microphone (for speech) 9 and
the microphone ( Reduce the noise contained in the stereo sound from 10).
[0021]
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FIG. 2 is a schematic view showing an appearance configuration of the mobile phone according
to the present embodiment. The parts corresponding to FIG. 1 are assigned the same reference
numerals and explanation thereof is omitted. The display unit 7 (including the touch panel 6) is
disposed substantially at the center of one surface of the housing. A photographing unit 3 is
disposed on the upper surface and the back surface, and an image photographed by the
photographing unit 3 is displayed on the display unit 7. Further, the microphone (for call) 9 and
the microphone (for recording) 10 are provided at both ends (upper and lower ends in the figure)
across the display unit 7. A speaker (piezoelectric) 11 is also provided on the same surface as the
microphone (for call) 9 and the microphone (for recording) 10.
[0022]
Next, the operation of the above-described embodiment will be described. FIG. 3 is a flowchart
for explaining the operation of the mobile phone 1 according to the present embodiment. First,
the control unit (CPU) 12 determines whether or not moving image shooting has been started
(step S10), and waits until moving image shooting is started (NO in step S10). Then, when
moving image shooting is started (YES in step S10), the control unit (CPU) 12 inputs a sound
(stereo sound) from the microphone (for call) 9 and the microphone (for recording) 10, The
moving image is photographed at step 3 (step S12).
[0023]
During moving image shooting, pressure change (wind pressure change) is detected from the
sound hole by the speaker (piezoelectric) 11 (step S14), and the sound from the microphone (for
call) 9 and the microphone (for recording) 10 and the speaker (piezoelectric) 11 A noise
canceller signal of the reverse phase to the noise is generated based on the pressure change
(wind pressure change) from step S17. Then, the control unit (CPU) 12 emits a sound
corresponding to the noise canceller signal of the reverse phase from the speaker (piezoelectric)
11 through the audio processing unit 8 (step S18).
[0024]
As a result, the speaker (piezoelectric) 11 outputs a sound that cancels the noise captured by the
microphone (for call) 9 and the microphone (for recording) 10, so substantially the microphone
(for call) 9 and the microphone (for The noise taken in at 10) is reduced.
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[0025]
Finally, the captured moving image is stored as a file (step S20).
Next, it is determined whether or not moving image shooting has ended (end by user operation
etc.) (step S22), and if shooting has not ended (NO in step S22), the process returns to step S12
and continues moving image shooting. On the other hand, if the photographing is ended (YES in
step S22), the process is ended.
[0026]
Although this embodiment is an example applied to a mobile phone as a terminal device, the
present invention is not limited to this. For example, a digital camera having a communication
function, a portable information terminal, a note pad, a personal computer It can be widely
applied to communication devices and other electronic devices.
[0027]
According to the above-described embodiment, the wind volume is detected using the existing
piezoelectric speaker used as the speaker, and feedback is performed on the wind noise
cancellation. It is possible to cancel noise and realize high-quality sound recording.
[0028]
The features of the present invention will be additionally described below.
Some or all of the above embodiments may be described as in the following appendices, but is
not limited to the following.
(Supplementary Note 1) FIG. 4 is a block diagram of supplementary note 1. As shown in this
figure, according to the invention described in appendix 1, the audio captured by the imaging
unit 22 is recorded as an audio-accompanying video while the audio is collected by the
microphone 21, and the audio-accompanying video is displayed. The electronic device 20 is
displayed by the unit 23 and outputs the sound of the audio-added video being reproduced by
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the speaker 24. The wind pressure change detection unit 25 detects a wind pressure change by
the speaker when recording the audio-added video; Noise canceller signal generation means for
generating a noise canceller signal for removing noise contained in the sound collected by the
microphone 21 based on the sound collected by the sound source 21 and the wind pressure
change detected by the wind pressure change detection means 25 26, a noise canceller signal
generated by the noise canceller signal generation means 26. And an electronic device
characterized by comprising: control means 27 for causing the speaker 24 to emit a
corresponding sound.
[0029]
(Supplementary Note 2) The electronic device according to Supplementary Note 1, wherein the
speaker is formed of a piezoelectric element.
[0030]
(Supplementary Note 3) The electronic device according to Supplementary note 1 or 2, wherein
the speaker and the microphone are disposed on the same surface of a housing of the electronic
device.
[0031]
(Supplementary Note 4) A microphone for collecting audio, a shooting unit for shooting an image
by the shooting unit, a display unit for displaying a video with audio during playback, and a
speaker for outputting a voice with audio during playback A method of processing noise in an
electronic device comprising: a wind pressure change detecting step of detecting a wind pressure
change by the speaker at the time of video recording with audio; a voice collected by the
microphone; and the wind pressure change detecting step. A noise canceller signal generation
step of generating a noise canceller signal for removing noise contained in the sound collected by
the microphone based on a wind pressure change; a sound corresponding to the noise canceller
signal generated in the noise canceller signal generation step Control step of emitting from the
speaker. It is the noise processing method.
[0032]
(Supplementary Note 5) The noise processing method according to supplementary note 4,
wherein the speaker is formed of a piezoelectric element.
[0033]
(Supplementary Note 6) The noise processing method according to supplementary note 4 or 5,
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characterized in that the speaker and the microphone are disposed on the same surface of a
housing of the electronic device.
[0034]
(Supplementary Note 7) A microphone for collecting voice, a shooting unit for shooting a video
by the shooting unit, a display unit for displaying a video with audio during playback, and a
speaker for outputting a voice with audio during playback And a wind pressure change detection
function for detecting a wind pressure change by the speaker at the time of video recording with
audio, a voice collected by the microphone, and a wind pressure change detected in the wind
pressure change detection step. A noise canceller signal generation function for generating a
noise canceller signal for removing noise contained in the voice collected by the microphone, and
a control for emitting a sound corresponding to the noise canceller signal generated by the noise
canceller signal generation function from the speaker It is a program characterized by executing
a function.
[0035]
Reference Signs List 1 mobile phone 2 communication unit 3 photographing unit 4 ROM 5 RAM
6 touch panel 7 display unit 8 audio processing unit 9 microphone (for telephone call) 10
microphone (for recording) 11 speaker (piezoelectric)
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