CN101894562A - Method and terminal for reducing influence of environment noise on video - Google Patents
Method and terminal for reducing influence of environment noise on video Download PDFInfo
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- CN101894562A CN101894562A CN2010102183437A CN201010218343A CN101894562A CN 101894562 A CN101894562 A CN 101894562A CN 2010102183437 A CN2010102183437 A CN 2010102183437A CN 201010218343 A CN201010218343 A CN 201010218343A CN 101894562 A CN101894562 A CN 101894562A
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Abstract
The invention relates to a method and a terminal for reducing influence of environment noise on video. The method comprises the following steps: picking up the environment noise by a terminal MIC when a terminal plays a program; denoising program sound by a denoising method; performing A/D and D/A conversion on the MIC collected environment noise and the denoised program sound; and outputting the denoised video sound by a Speaker. Users can select whether a mobile TV program requires denoising or not according to the intensity of the environment noise, because denoising processing can increase load of a mobile phone baseband processor and reduce standby duration of the mobile phone. In the invention, the mobile phone with a mobile TV function is changed little, is convenient for use, and enriches functions of the mobile terminal, thus fulfilling the requirement that a user needs to hear clear sound when watching the mobile TV in a noisy background environment.
Description
Technical field
The present invention relates to the acoustic processing technical field, more specifically, relate to a kind of method and terminal that reduces environmental noise to audible effects.
Background technology
By terminal, particularly portable terminal watches video frequency program or listening to audio program very general, and in recent years, along with being in fashion of mobile TV, the user watched that by mobile phone mobile TV program is also more and more general.Mobile TV is to be terminal device with the mobile phone, and a technology of TV transmission content is to utilize portable terminal that the business of video information service is provided for the user.Its advantage is can be mutual, and user management and billing mechanism are perfect, can carry out the customization and the interactive operation of video frequency program easily.At present, the mobile TV standard and the disunity of various countries, the mobile TV industry standard of China is CMMB.CMMB is the abbreviation of English China Mobile Multimedia Broadcasting (China Mobile multimedia broadcasting).It is the system of first cover of domestic independent research towards multiple portable terminals such as mobile phone, PDA, MP3, notebook computers, utilizes the S-band signal to realize that " world " one covers, whole nation roaming, supports 25 cover TV programme and 30 cover broadcast programs.
Now, CMMB network large tracts of land covers each provincial capital and more than 100 prefecture-level city, has occurred the mobile phone terminal of increasing support CMMB mobile TV on the market immediately.The user can watch the rich video program whenever and wherever possible under the state that moves, but no matter on the subway or on the bus, noisy environmental noise all can interfere with the effect that the user listens to, and improves the demand that the user watches the mobile TV satisfaction in the noisy environment of background noise so just be created in.
Summary of the invention
The objective of the invention is do not changing under the precondition that has mobile phone hardware framework now, only need to adjust software frame and add noise-reduction method, be implemented in and export mobile TV sound clearly in the noisy environment with mobile TV function.
For achieving the above object, the present invention proposes a kind of terminal that reduces environmental noise to audible effects, and it comprises digital signal processor (DSP), audio codec (CODEC), MIC and audio output device;
Described digital signal processor (DSP) is used for the environmental noise that MIC picked up by noise-reduction method and the sound signal of terminal is handled;
Described CODEC carries out A/D and D/A conversion to environmental noise and the audio sound after the noise reduction process that MIC picks up;
Described audio output device output is through the audio sound behind the noise reduction.
Further, described sound signal is the mobile TV sound signal.
Further, described terminal also comprises mobile TV antenna and mobile TV processing unit, and described mobile TV antenna is used to receive the mobile TV signal; Described mobile TV processing unit is used to receive mobile TV program and carries out demodulation, filtering and decoding.
Further, digital signal processor is included in the described terminal baseband processor, is used for the mobile TV signal that the environmental noise that MIC picked up by noise-reduction method and mobile TV processing unit export to baseband processor and handles.
Further, described noise-reduction method is meant that DSP by the audio digital signals of exporting to baseband processor by the digital signal that carries environmental noise information and the terminal of CODEC input is handled, makes the terminal audio frequency signal that must export carry component of signal identical with the environmental noise amplitude, that phase place is opposite.
The present invention also proposes a kind of method that reduces environmental noise to audible effects, and it is included in terminal when carrying out playing programs, and terminal MIC picks up environmental noise; Program sound is carried out noise reduction process by noise-reduction method; Environmental noise and the program sound after the noise reduction process that MIC is picked up carry out A/D and D/A conversion; By the audio sound behind the audio output device output process noise reduction.
Further, described sound signal is the mobile TV sound signal.
Further, described terminal connects receives the mobile TV signal, and carries out demodulation, filtering and decoding.
Further, described noise-reduction method is meant that DSP is logical the audio digital signals of exporting to baseband processor by the digital signal that carries environmental noise information and the terminal of CODEC input is handled, makes the terminal audio frequency signal that must export carry component of signal identical with the environmental noise amplitude, that phase place is opposite.
In sum, the present invention only need increase the noise-reduction method to the mobile TV audio frequency in mobile phone, just can realize exporting the effect of clear mobile TV sound, satisfy the user when watching the mobile TV video frequency program, for the demand of listening to of clear audio frequency.
Description of drawings
Fig. 1 is that mobile phone of the present invention picks up environmental noise by MIC, carries out the structured flowchart of noise reduction process by noise-reduction method;
Fig. 2 is that mobile phone of the present invention picks up environmental noise by MIC, realizes the process flow diagram of mobile phone sound noise reduction process by noise-reduction method;
Fig. 3 is that the present invention runs on the software module and the course of work in the digital signal processor (DSP).
Embodiment
Technical solution of the present invention is only adjusted software frame and is added noise-reduction method under the precondition that does not change existing terminal hardware, is implemented in and exports sound comparatively clearly in the noisy environment.
Technical solution of the present invention comprises following feature:
The user selects whether need carry out noise reduction process when broadcasting mobile TV program or other video-audio programs according to the power of environmental noise;
When carrying out playing programs, terminal MIC picks up environmental noise;
Program sound is carried out noise reduction process by noise-reduction method;
The preferential mobile TV sound of selecting after noise reduction process is carried out in earphone output;
If do not insert earphone, then select to export the mobile TV sound that carries out after the noise reduction process by Speaker (loudspeaker).
Below in conjunction with accompanying drawing, and be that example describes technical scheme of the present invention with mobile phone terminal mobile phone television viewing program.
As shown in Figure 1, be that mobile phone of the present invention picks up environmental noise by MIC, carry out the structured flowchart of noise reduction process by noise-reduction method, it comprises mobile TV antenna, mobile TV processing unit, digital signal processor, CODEC (audio codec), Speaker (loudspeaker), earphone jack and MIC.
Wherein, the mobile TV antenna is used for mobile phone reception mobile TV signal; The mobile TV processing unit is used for mobile phone and receives mobile TV program and carry out demodulation, filtering and decoding; Digital signal processor (DSP) is included in the mobile phone baseband processor, is used for the mobile TV signal that environmental noise that mobile phone picks up MIC by noise-reduction method and mobile TV processing unit export to baseband processor and handles; CODEC is used for mobile phone environmental noise and the mobile TV sound after the noise reduction process that MIC picks up is carried out A/D (analog signal conversion digital signal) and D/A (digital signal converting analogue signals) conversion, and Speaker is used for the mobile phone output sound; Earphone jack is used to insert earphone and is used to export handset audio sound, and MIC is used for mobile phone and picks up environmental noise.Certainly, Speaker and earphone can be selected to use.
As shown in Figure 2, mobile phone picks up environmental noise by MIC, realizes that by noise-reduction method the concrete operations flow process of mobile TV sound noise reduction process is as follows:
S201: open mobile phone player;
In the function menu of mobile phone, open mobile phone player, the mobile TV processing unit begins by the mobile TV antenna aerial mobile TV signal to be received, this signal is carried out demodulation, filtering and process of decoding, and it is pending to send to baseband processor etc. then.
S202: the MIC of mobile phone picks up environmental noise, exports to CODEC;
In MIC carries out process that environmental noise picks up,, must use corresponding wave filter to carry out interference eliminated except environmental noise also can be introduced some other interference.And since people's ear the sound frequency that can hear be within the specific limits, so in the signal that MIC picked up, useful information is preserved by the bandpass filter of selecting suitable cutoff frequency.The signal that guarantees input CODEC to the full extent comprises environmental noise information as far as possible, especially the environmental noise information of the respective frequencies that can hear of people's ear.
S203:CODEC exports to baseband processor by the A/D conversion with signal;
The CODEC of mobile phone picks up MIC by higher sample frequency and carries out A/D (simulating signal is to digital signal) through the environmental noise that has the respective frequencies that people's ear can hear of abundant filtering and change, the digital signal that carries environmental noise information after will changing is then exported to baseband processor, and this baseband processor inside is useful on the digital signal processor (DSP) that noise is handled.
S204:DSP carries out noise reduction process by noise-reduction method to mobile TV sound;
DSP in the mobile phone baseband processor passes through noise-reduction method, handle for the mobile TV digital signal of exporting to baseband processor by the digital signal that carries environmental noise information and the mobile TV processing unit of CODEC input, the mobile TV signal that must export is carried and the environmental noise component of signal that amplitude was identical, phase place is opposite (comprising various frequency components).
S205:CODEC carries out the D/A conversion with mobile TV sound;
The CODEC of mobile phone will by operation noise-reduction method in the baseband processor DSP imported carries and carry out A/D (simulating signal is to digital signal) with the mobile TV signal of environmental noise (the comprising various frequency components) component of signal that amplitude is identical, phase place is opposite and change, the simulating signal of passing through after the conversion also needs to carry out corresponding filtering.
S206: whether the earphone of detection of handset inserts, and exists if detect the earphone of mobile phone, in order to guarantee better to listen to the effect of mobile TV sound, then enters step S207; If the earphone of mobile phone does not exist, then enter step S208.
S207: open earphone passage output mobile TV sound;
The CODEC of mobile phone inserts by the earphone of detection of handset, open the earphone passage, output through operation noise-reduction method in the baseband processor DSP handled, and carried out the mobile TV speech simulation signal that A/D (simulating signal is to digital signal) changes.
S208: open speaker passage output mobile TV sound;
The CODEC of mobile phone does not insert by the earphone of detection of handset, open the Speaker passage, output through operation noise-reduction method in the baseband processor DSP handled, and carried out the mobile TV speech simulation signal that A/D (simulating signal is to digital signal) changes.
As shown in Figure 3, description is the software module and the course of work that runs in the digital signal processor (DSP):
The digital signal that carries environmental noise information by the CODEC input to its analysis of carrying out amplitude, calculates the conversion of current environment noise magnitude value and amplitude;
Generate the signal that is used to offset the current environment noise opposite with current environment noise phase place, that amplitude is identical;
To superpose synthetic with the signal that is used to offset the current environment noise (being the signal that current environment noise phase place is opposite, amplitude is identical) by the mobile TV signal that the mobile TV processing unit carries out demodulation, filtering and decoding;
The mobile TV signal that has the component of signal that is used to offset the current environment noise behind synthetic the finishing is exported to the CODEC that connects DSP.
Do not changing under the precondition that has mobile phone hardware framework now, only needing to adjust software frame and add noise-reduction method, be implemented in and export mobile TV sound clearly in the noisy environment with mobile TV function.The user selects whether need carry out noise reduction process when broadcasting mobile TV program according to the power of environmental noise, because noise reduction process can increase the mobile phone baseband processor load, reduces the cell phone standby time.The present invention changes less to existing mobile phone with mobile TV function, the convenient use enriched the function of portable terminal, has satisfied the demand of listening to clear sound when the user watches mobile TV in the noisy environment of background noise.
Certainly; the present invention also can have numerous embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making various corresponding changes or variation according to the present invention; in every case any modification of being done within the spirit and principles in the present invention, be equal to replacements, improvement, all should be included within protection scope of the present invention.
Claims (9)
1. terminal that reduces environmental noise to audible effects, it comprises digital signal processor (DSP), audio codec (CODEC), MIC and audio output device;
Described DSP is used for the environmental noise that MIC picked up by noise-reduction method and the sound signal of terminal is handled;
Described CODEC carries out A/D and D/A conversion to environmental noise and the audio sound after the noise reduction process that MIC picks up;
Described audio output device output is through the audio sound behind the noise reduction.
2. terminal as claimed in claim 1 is characterized in that: described sound signal is the mobile TV sound signal.
3. terminal as claimed in claim 2 is characterized in that: described terminal also comprises mobile TV antenna and mobile TV processing unit, and described mobile TV antenna is used to receive the mobile TV signal; Described mobile TV processing unit is used to receive mobile TV program and carries out demodulation, filtering and decoding.
4. terminal as claimed in claim 1, it is characterized in that: digital signal processor is included in the described terminal baseband processor, is used for the mobile TV signal that the environmental noise that MIC picked up by noise-reduction method and mobile TV processing unit export to baseband processor and handles.
5. terminal as claimed in claim 1, it is characterized in that: described noise-reduction method is meant that DSP by the audio digital signals of exporting to baseband processor by the digital signal that carries environmental noise information and the terminal of CODEC input is handled, makes the terminal audio frequency signal that must export carry component of signal identical with the environmental noise amplitude, that phase place is opposite.
6. method that reduces environmental noise to audible effects, it is included in terminal when carrying out playing programs, and terminal MIC picks up environmental noise; Program sound is carried out noise reduction process by noise-reduction method; Environmental noise and the program sound after the noise reduction process that MIC is picked up carry out A/D and D/A conversion; By the audio sound behind the audio output device output process noise reduction.
7. method as claimed in claim 6 is characterized in that: described sound signal is the mobile TV sound signal.
8. method as claimed in claim 7 is characterized in that: described terminal receives the mobile TV signal, and carries out demodulation, filtering and decoding.
9. method as claimed in claim 6, it is characterized in that: described noise-reduction method is meant that DSP is logical the audio digital signals of exporting to baseband processor by the digital signal that carries environmental noise information and the terminal of CODEC input is handled, makes the terminal audio frequency signal that must export carry component of signal identical with the environmental noise amplitude, that phase place is opposite.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102183437A CN101894562A (en) | 2010-07-02 | 2010-07-02 | Method and terminal for reducing influence of environment noise on video |
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Cited By (6)
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| CN102784433A (en) * | 2012-01-10 | 2012-11-21 | 王培人 | Integral sleep improvement device based on multi-sensor information |
| WO2013067958A1 (en) * | 2011-11-11 | 2013-05-16 | 杭州硅星科技有限公司 | Headset circuit |
| CN109412730A (en) * | 2018-11-24 | 2019-03-01 | 六安富华智能信息科技有限公司 | A kind of emergent broadcast terminal having audio broadcasting self-checking function |
| WO2019084886A1 (en) * | 2017-11-03 | 2019-05-09 | 深圳传音通讯有限公司 | Audio denoising method and denoising device, mobile terminal and readable storage medium |
| CN112682915A (en) * | 2020-12-21 | 2021-04-20 | 珠海格力电器股份有限公司 | Air conditioner control method and device, storage medium and air conditioner |
| CN113421577A (en) * | 2021-05-10 | 2021-09-21 | 北京达佳互联信息技术有限公司 | Video dubbing method and device, electronic equipment and storage medium |
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| WO2008049311A1 (en) * | 2006-10-27 | 2008-05-02 | Huawei Technologies Co., Ltd. | A method, system and apparatus for transmitting the encoded code stream of the background noise |
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| CN1737905A (en) * | 2004-08-18 | 2006-02-22 | 华为技术有限公司 | Device and method for eliminating voice communication terminal background noise |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013067958A1 (en) * | 2011-11-11 | 2013-05-16 | 杭州硅星科技有限公司 | Headset circuit |
| CN102784433A (en) * | 2012-01-10 | 2012-11-21 | 王培人 | Integral sleep improvement device based on multi-sensor information |
| WO2019084886A1 (en) * | 2017-11-03 | 2019-05-09 | 深圳传音通讯有限公司 | Audio denoising method and denoising device, mobile terminal and readable storage medium |
| CN111316355A (en) * | 2017-11-03 | 2020-06-19 | 深圳传音通讯有限公司 | Audio noise reduction method, noise reduction device, mobile terminal and readable storage medium |
| CN109412730A (en) * | 2018-11-24 | 2019-03-01 | 六安富华智能信息科技有限公司 | A kind of emergent broadcast terminal having audio broadcasting self-checking function |
| CN112682915A (en) * | 2020-12-21 | 2021-04-20 | 珠海格力电器股份有限公司 | Air conditioner control method and device, storage medium and air conditioner |
| CN113421577A (en) * | 2021-05-10 | 2021-09-21 | 北京达佳互联信息技术有限公司 | Video dubbing method and device, electronic equipment and storage medium |
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Application publication date: 20101124 |