JP2013025281A - Electronic device, noise processing method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve high sound quality recording by cancelling any noise due to a wind without adding any special component.SOLUTION: A control section (CPU) 12 detects a pressure change (a wind pressure change) from a sound hole by a speaker (piezoelectric) 11 during motion image shooting, on the basis of voices from a microphone (for conversation) 9 and a microphone (for recording) 10 and the pressure change (the wind pressure change) detected by the speaker (piezoelectric) 11, generates a noise canceller signal of an opposite phase to a noise, and emits a sound equivalent to the noise canceller signal of the opposite phase from the speaker (piezoelectric) 11 via a voice processing section 8. The speaker (piezoelectric) 11 outputs a sound that cancels the noise taken by the microphone (for conversation) 9 and the microphone (for recording) 10.

Description

  The present invention relates to an electronic device, a noise processing method, and a program that are used in an electronic device such as a mobile phone and can reproduce a good call sound quality even in an outdoor environment.

  In recent years, with the expansion of demand for mobile phones, device manufacturers are working on the development of thin and stylish mobile phones equipped with video phone, video playback, and hands-free phone functions. Among these, there is a great demand for acoustic functions, and in particular, a demand for high-quality voice calls is high.

  Conventionally, mobile phones include a normal call using a handset and a hands-free call in which a phone call is made without holding the phone by hand. When considering the convenience of mobile phones that can be used anytime and anywhere, they are required to be used not only indoors but also outdoors. When used outdoors, there is a problem that it is difficult to hear the voice associated with the call due to noise from the wind, noise from the surroundings, and the like. Therefore, it is conceivable to incorporate a noise canceller that detects an external wind pressure and cancels the wind pressure.

  For example, Patent Documents 1 and 2 disclose techniques relating to a wind pressure sensor that measures a weak wind pressure. Further, in Patent Document 3, a sound receiving plate made of a piezoelectric element that generates a voltage corresponding to an external sound pressure is provided, and a current corresponding to the voltage generated by the sound receiving plate is passed through a resistor to generate a joule. Technology to provide a speaker, sound wave output circuit, etc. that attenuates the sound that is consumed as heat, detects sound that has passed through the sound receiving plate, and outputs sound waves that have the same phase and amplitude as the sound that has passed. Is disclosed.

JP 2002-148273 A JP 59-218961 A JP-A-6-308969

  However, in the above-described prior art, in order to cancel noise caused by wind, it is necessary to add a special part, and there is a problem that it is difficult to realize with a mobile phone that must be downsized.

  Accordingly, an object of the present invention is to provide an electronic device, a noise processing method, and a program that can cancel noise caused by wind and realize high-quality sound recording without specially adding components.

  The electronic apparatus of the present invention collects audio by a microphone, records the video captured by the imaging unit as video with audio, displays the video with audio being reproduced on the display unit, and reproduces the audio being reproduced. An electronic device that outputs audio of an attached video by a speaker, and at the time of recording video with audio, wind pressure change detecting means for detecting a wind pressure change by the speaker, audio collected by the microphone, and the wind pressure change detecting means Corresponding to a noise canceller signal generated by the noise canceller signal generating means and a noise canceller signal generating 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 a control means for radiating sound from the speaker. It is an electronic device that.

  The noise processing method of the present invention includes a microphone that collects sound, a photographing unit that captures a video by a photographing unit, a display unit that displays a video with audio that is being reproduced, and audio of the video with audio that is being reproduced. A noise processing method in an electronic device comprising a speaker that outputs a sound, comprising: a wind pressure change detecting step for detecting a wind pressure change by the speaker during video recording with sound; a sound collected by the microphone; and the wind pressure change detection Based on the wind pressure change detected in the step, a noise canceller signal generation step for generating a noise canceller signal for removing noise included in the sound collected by the microphone, and a noise canceller signal generated in the noise canceller signal generation step And a control step of emitting a corresponding sound from the speaker. A noise processing method characterized.

  The program of the present invention outputs a microphone for collecting sound, a photographing unit for photographing a video by a photographing unit, a display unit for displaying a video with a sound being reproduced, and a sound with a sound being reproduced. A wind pressure change detecting function for detecting a wind pressure change by the speaker when recording a video with sound, a sound collected by the microphone, and a wind pressure change detected in the wind pressure change detecting step. And a noise canceller signal generation function for generating a noise canceller signal for removing noise included in the sound collected by the microphone, and a sound corresponding to the noise canceller signal generated by the noise canceller signal generation function is radiated from the speaker. This is a program characterized by causing a control function to be executed.

  According to the present invention, it is possible to cancel noise caused by wind and achieve high-quality sound recording without adding special parts.

It is a block diagram which shows the structure of the mobile telephone 1 by embodiment of this invention. 1 is a schematic diagram illustrating an external configuration of a mobile phone according to an embodiment. FIG. 4 is a flowchart for explaining the operation of the mobile phone 1 according to the present embodiment. FIG.

  The present invention detects a flow of air in real time by detecting a pressure change from a sound hole using a speaker made of a piezoelectric element arranged on the same surface (near) as a moving image recording microphone. It is characterized in that high-quality sound recording is realized by outputting a sound having a phase opposite to that of the noise from a speaker so as to cancel noise during recording.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a mobile phone 1 according to an embodiment of the present invention. In the figure, a mobile phone 1 includes a communication unit 2, a photographing unit 3, a ROM 4, a RAM 5, a touch panel 6, a display unit 7, a voice processing unit 8, a microphone (for calling) 9, a microphone (for recording) 10, and a speaker (piezoelectric). Element) 11.

  The communication unit 2 performs voice communication and data communication via a telephone line network. The photographing unit 3 includes a lens group such as a focus lens and a zoom lens, and an image sensor (CCD or the like), and adjusts auto-focusing, aperture, zooming, and the like according to a control signal from the image capture control unit 3, and the lens group by the image sensor. The light of the subject projected via is converted into an electrical signal and output as an imaging signal. The photographing unit 3 can photograph a moving image in addition to a still image. In the present embodiment, a technique for suppressing noise caused by wind or the like during moving image shooting is provided.

  The ROM 4 stores a program necessary for controlling each part of the mobile phone 1 by the control unit (CPU) 12 and data necessary for controlling each part. The RAM 5 is used as a buffer memory for temporarily storing image data and moving image data captured by the photographing unit 3, and is also used as a working memory for the control unit (CPU) 12.

  The touch panel 6 is provided on the display unit 7 and is used for touch operation of operation instructions, data input, and the like according to the display displayed on the display unit 7. The display unit 7 includes a color LCD and a driving circuit thereof, and displays images captured by the imaging unit 3, moving images, and various information related to communication / calls.

  The voice processing unit 8 supplies the voice from the microphone (for calling) 9 to the control unit (CPU) 12 and processes the voice signal and outputs it from the speaker (piezoelectric) 11 during a call. In addition, the sound processing unit 8 performs stereo recording of sound (noise is included in the sound) using a microphone (for calling) 9 and a microphone (for recording) 10 during video shooting, and a speaker (piezoelectric). ) 11, the pressure (wind pressure) change from the sound hole is taken in and supplied to the control unit (CPU) 12.

  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 pressure (wind pressure) change from the speaker (piezoelectric) 11 and a microphone (for calling) 9 and a microphone (for recording) 10 during moving image shooting. Based on the audio signal, the wind pressure (or the air volume) is set as a normal phase noise, and a sound having a phase opposite to the noise is radiated from the speaker (piezoelectric) 11. (For recording) Reduce noise included in stereo sound from 10.

  FIG. 2 is a schematic diagram showing an external configuration of the mobile phone according to the present embodiment. It should be noted that portions corresponding to those in FIG. The display unit 7 (including the touch panel 6) is disposed approximately at the center of one surface of the housing. On the rear surface of the upper surface, a photographing unit 3 is arranged, and an image photographed by the photographing unit 3 is displayed on the display unit 7. A microphone (for calling) 9 and a microphone (for recording) 10 are provided at both ends (upper and lower ends in the figure) with the display unit 7 interposed therebetween. A speaker (piezoelectric) 11 is also provided on the same plane as the microphone (for calling) 9 and the microphone (for recording) 10.

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 is started (step S10), and waits until moving image shooting is started (NO in step S10). When the moving image shooting is started (YES in step S10), the control unit (CPU) 12 inputs the sound (stereo sound) from the microphone (for calling) 9 and the microphone (for recording) 10, and the shooting unit. The moving image is photographed at 3 (step S12).

  During video recording, the speaker (piezoelectric) 11 detects a pressure change (wind pressure change) from the sound hole (step S14), and the sound from the microphone (for calling) 9 and the microphone (for recording) 10 and the speaker (piezoelectric) 11 are detected. A noise canceller signal having a phase opposite to that of the noise is generated based on the pressure change (wind pressure change) from (step S16). And the control part (CPU) 12 radiates | emits the sound equivalent to this noise canceller signal of a reverse phase from the speaker (piezoelectric) 11 via the audio | voice process part 8 (step S18).

  As a result, the speaker (piezoelectric) 11 outputs a sound that cancels out the noise captured by the microphone (for calling) 9 and the microphone (for recording) 10. The noise taken in at (for recording) 10 is reduced.

  Finally, the captured moving image is saved as a file (step S20). Next, it is determined whether or not the moving image shooting has ended (such as an end by a user operation) (step S22). If the shooting has not ended (NO in step S22), the process returns to step S12 to continue moving image shooting. On the other hand, if the photographing is finished (YES in step S22), the process is finished.

  Although this embodiment is an example applied to a mobile phone as a terminal device, the present invention is not limited to this, and 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.

  According to the above-described embodiment, since the air volume is detected using the existing piezoelectric speaker used as the speaker and the feedback is performed for the wind noise canceling, it is possible to use the wind without adding any parts. Noise canceling and high sound quality recording can be realized.

The features of the present invention will be described below.
A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
FIG. 4 is a configuration diagram of Supplementary Note 1. As shown in this figure, the invention described in Appendix 1 is
While the sound is collected by the microphone 21, the video imaged by the imaging unit 22 is recorded as video with audio, and the video with audio being reproduced is displayed by the display unit 23, and the audio with the audio with audio being reproduced is displayed. Is output from the speaker 24, and
Wind pressure change detecting means 25 for detecting a wind pressure change by the speaker at the time of recording video with sound;
A noise canceler signal for generating a noise canceler signal for removing noise contained in the sound collected by the microphone 21 based on the sound collected by the microphone 21 and the wind pressure change detected by the wind pressure change detecting means 25. Generating means 26;
An electronic device comprising: a control unit 27 that radiates a sound corresponding to the noise canceller signal generated by the noise canceller signal generation unit 26 from the speaker 24.

(Appendix 2)
The electronic device according to attachment 1, wherein the speaker is made of a piezoelectric element.

(Appendix 3)
The electronic device according to appendix 1 or 2, wherein the speaker and the microphone are arranged on the same surface of a casing of the electronic device.

(Appendix 4)
An electronic device comprising: a microphone that collects sound; a photographing unit that captures a video by a photographing unit; a display unit that displays a video of a video with audio that is being reproduced; and a speaker that outputs audio of the video with audio that is being reproduced. A noise processing method in equipment,
A wind pressure change detecting step of detecting a wind pressure change by the speaker at the time of recording a video with sound;
A noise canceller signal generating step for generating a noise canceler signal for removing noise included in the voice collected by the microphone based on the voice collected by the microphone and the wind pressure change detected by the wind pressure change detecting step; ,
And a control step of emitting a sound corresponding to the noise canceller signal generated in the noise canceller signal generation step from the speaker.

(Appendix 5)
The noise processing method according to appendix 4, wherein the speaker is made of a piezoelectric element.

(Appendix 6)
6. The noise processing method according to appendix 4 or 5, wherein the speaker and the microphone are arranged on the same surface of the casing of the electronic device.

(Appendix 7)
An electronic device comprising: a microphone that collects sound; a photographing unit that captures a video by a photographing unit; a display unit that displays a video of a video with audio that is being reproduced; and a speaker that outputs audio of the video with audio that is being reproduced. On the machine computer,
A wind pressure change detecting function for detecting a wind pressure change by the speaker at the time of recording video with sound;
A noise canceller signal generation function for generating a noise canceler signal for removing noise included in the sound collected by the microphone, based on the sound collected by the microphone and the wind pressure change detected in the wind pressure change detection step;
A program for executing a control function for radiating sound corresponding to a noise canceller signal generated by the noise canceller signal generation function from the speaker.

1 Mobile phone 2 Communication unit 3 Shooting unit 4 ROM
5 RAM
6 Touch panel 7 Display unit 8 Audio processing unit 9 Microphone (for calling)
10 Microphone (for recording)
11 Speaker (piezoelectric)

Claims (7)

While collecting sound with a microphone, the video taken by the photographing unit is recorded as audio-added video, the video with audio being reproduced is displayed on the display unit, and the audio with the audio being reproduced is reproduced by a speaker. Output electronic equipment,
Wind pressure change detecting means for detecting a wind pressure change by the speaker during video recording with sound;
Noise canceller signal generating means for generating a noise canceler signal for removing noise contained in the sound collected by the microphone based on the sound collected by the microphone and the wind pressure change detected by the wind pressure change detecting means; ,
An electronic device comprising: control means for radiating sound corresponding to the noise canceller signal generated by the noise canceller signal generation means from the speaker.   The electronic apparatus according to claim 1, wherein the speaker includes a piezoelectric element.   The electronic device according to claim 1, wherein the speaker and the microphone are arranged on the same surface of a casing of the electronic device. An electronic device comprising: a microphone that collects sound; a photographing unit that captures a video by a photographing unit; a display unit that displays a video of a video with audio that is being reproduced; and a speaker that outputs audio of the video with audio that is being reproduced. A noise processing method in equipment,
A wind pressure change detecting step of detecting a wind pressure change by the speaker at the time of recording a video with sound;
A noise canceller signal generating step for generating a noise canceler signal for removing noise included in the voice collected by the microphone based on the voice collected by the microphone and the wind pressure change detected by the wind pressure change detecting step; ,
And a control step of emitting a sound corresponding to the noise canceller signal generated in the noise canceller signal generation step from the speaker.   The noise processing method according to claim 4, wherein the speaker includes a piezoelectric element.   The noise processing method according to claim 4, wherein the speaker and the microphone are arranged on the same surface of the casing of the electronic device. An electronic device comprising: a microphone that collects sound; a photographing unit that captures a video by a photographing unit; a display unit that displays a video of a video with audio that is being reproduced; and a speaker that outputs audio of the video with audio that is being reproduced. On the machine computer,
A wind pressure change detecting function for detecting a wind pressure change by the speaker at the time of recording video with sound;
A noise canceller signal generation function for generating a noise canceler signal for removing noise included in the sound collected by the microphone, based on the sound collected by the microphone and the wind pressure change detected in the wind pressure change detection step;
A program for executing a control function for radiating sound corresponding to a noise canceller signal generated by the noise canceller signal generation function from the speaker.

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