CN102223428A - Noise reducing method and mobile terminal - Google Patents
Noise reducing method and mobile terminal Download PDFInfo
- Publication number
- CN102223428A CN102223428A CN2011101724384A CN201110172438A CN102223428A CN 102223428 A CN102223428 A CN 102223428A CN 2011101724384 A CN2011101724384 A CN 2011101724384A CN 201110172438 A CN201110172438 A CN 201110172438A CN 102223428 A CN102223428 A CN 102223428A
- Authority
- CN
- China
- Prior art keywords
- signal
- noise
- digital
- noise signal
- portable terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6016—Substation equipment, e.g. for use by subscribers including speech amplifiers in the receiver circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Telephone Function (AREA)
Abstract
The embodiment of the invention provides a noise reducing method and a mobile terminal. The method is applied to the downlink of the mobile terminal and comprises the following steps of: performing reversal processing on an acquired noise signal synchronous to environmental noise; and superposing the noise signal subjected to the reversal processing, with a voice signal received by the mobile terminal, and outputting the superposed signal. According to the noise reducing method and the mobile terminal provided by the invention, the noise reduction problem in noisy environment is solved effectively, but also the transmission quality of voice is taken into consideration.
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to a kind of method and portable terminal that reduces noise.
Background technology
At present, portable terminal has become indispensable communication tool in people's life, uses very general.Its applied environment varies, and can use under more noisy environment inevitably, as large-scale dining room, public transport, downtown area and road limit etc.
The mobile phone of existing decrease of noise functions all is to carry out noise reduction process on up link on the market now, and its implementation mainly is divided into hardware noise reduction and Digital Signal Processing (DSP) noise reduction.
Hardware noise reduction scheme, implementation method is simple, and single Mike (Mic) just can realize decrease of noise functions.But it has shortcoming, is exactly in noise reduction, also be very large to the decay of voice, and distortion is serious, and voice have spacious and suddenly big or suddenly small phenomenon.Especially when background noise is bigger, must adopt strong noise reduction mode, voice can become especially little like this, and it is very painstaking that the other side sounds.
DSP noise reduction scheme is divided into single Mic and two kinds of two Mic; Single Mic scheme, hardware is realized simple, by the control of DSP parameter, operates more flexible; Shortcoming is that the effect of noise reduction is limited, does not especially reach expected effect for nonstationary noise (as Caf é noise).Two Mic schemes by DSP parameter control, operates more flexibly, and noise reduction is obvious, and the fidelity of voice is higher, and volume decays less.
Portable terminal uses more prevalent under noisy environment, as the construction site, subway and public transport etc., it is the up demand that decrease of noise functions can not satisfy the user far away that has, because can only guarantee that like this receiving talking can be to hear voice more clearlyly, and calling party is in more noisy environment on every side, even Headphone volume is big again, also is difficult to not hear the content of the other side's voice.
Summary of the invention
The embodiment of the invention provides a kind of method and portable terminal that reduces noise, and when receiving calls under noisy environment to solve existing portable terminal, calling party can't not heard the problem of the other side's voice content.
The embodiment of the invention provides a kind of method that reduces noise, is applied to the down link of portable terminal, and this method comprises:
Carry out anti-phase processing with what collect with the synchronous noise signal of ambient noise;
The voice signal that noise signal after the anti-phase processing and described portable terminal are received superposes, and the signal after the output stack.
Preferably, the synchronous noise signal of described that will collect and ambient noise is carried out anti-phase processing and is comprised:
The noise signal that collects is amplified and analog-to-digital conversion, the noise signal after the analog-to-digital conversion is carried out relevant and Synchronous Processing with ambient noise, and the noise signal after relevant and the Synchronous Processing is carried out anti-phase processing.
Preferably, the signal after the described output stack comprises:
Signal after the stack is carried out exporting after digital-to-analogue conversion and the processing and amplifying.
The embodiment of the invention also provides a kind of portable terminal, and this portable terminal comprises:
Anti-phase treatment circuit is used for carrying out anti-phase processing with what collect with the synchronous noise signal of ambient noise;
Superimposer is used for the voice signal that the noise signal after the anti-phase processing of described anti-phase treatment circuit and described portable terminal receive is superposeed; And
Receiver is used to export the signal after described superimposer superposes.
Preferably, described anti-phase treatment circuit comprises:
With reference to Mike, be used for the acquisition noise signal;
Sef-adapting filter is used for the described noise signal that collects with reference to Mike is carried out relevant and Synchronous Processing with ambient noise;
Inverter is used for to described sef-adapting filter the noise signal after the relevant and Synchronous Processing and carries out anti-phase processing.
Preferably, described anti-phase treatment circuit also comprise successively series connection and described with reference to amplifier and analog to digital converter between Mike and the described sef-adapting filter, wherein:
Described amplifier is used for described noise signal with reference to Mike's collection is amplified;
Described analog to digital converter is used for the noise signal after the described amplifier amplification is carried out analog-to-digital conversion, and the noise signal after the analog-to-digital conversion is sent to described sef-adapting filter.
Preferably, described portable terminal also comprises:
Connect successively and digital to analog converter and amplifier between described superimposer and described receiver, wherein:
Described digital to analog converter is used for the signal after the described superimposer stack is carried out digital-to-analogue conversion, and the signal after the digital-to-analogue conversion is sent to described amplifier;
Described amplifier exports receiver to after being used for the signal that described digital to analog converter sends amplified.
The method of above-mentioned reduction noise and portable terminal have not only solved the noise reduction problem under the noisy environment effectively, have also taken into account the transmission quality of voice simultaneously.
Description of drawings
Fig. 1 is the up link decrease of noise functions theory diagram of the embodiment of the invention;
Fig. 2 is the down link decrease of noise functions theory diagram of the embodiment of the invention;
Fig. 3 is main mic and the signal schematic representation that receives with reference to mic in the up link of the embodiment of the invention;
Fig. 4 is the ambient noise signal schematic diagram that the embodiment of the invention is extracted based on the reference mic among Fig. 3;
Fig. 5 is the ascending voice signal schematic representation of embodiment of the invention input baseband chip;
Fig. 6 is the noise signal of embodiment of the invention receiver output and the schematic diagram of ambient noise signal.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter will be elaborated to embodiments of the invention in conjunction with the accompanying drawings.Need to prove that under the situation of not conflicting, embodiment among the application and the feature among the embodiment be combination in any mutually.
The embodiment of the invention provides a kind of portable terminal, and this portable terminal all has the function that reduces noise on up link and down link; Wherein, the DSP scheme of the two Mic that are based on up link that on up link, adopt, as shown in Figure 1, it is the up link decrease of noise functions theory diagram of the embodiment of the invention, for guaranteeing good noise reduction, generally all can use two Mic, one is main Mic, be used for normally receiving voice, simultaneously with noise; One is with reference to Mic (or secondary Mic), is mainly used to gather ambient noise.If can guarantee suitably to widen on the consistency of Mic monomer and the layout distance (as greater than 8cm) of two Mic, so obtained noise reduction can be better.Because this scheme is same as the prior art, no longer describe in detail herein; Also introduced a kind of improved noise reduction scheme on down link, it comprises: anti-phase treatment circuit is used for carrying out anti-phase processing with what collect with the synchronous noise signal of ambient noise; Superimposer is used for the voice signal that the noise signal after the anti-phase processing of described anti-phase treatment circuit and described portable terminal receive is superposeed; And receiver, be used to export the signal after described superimposer superposes.
Wherein, described anti-phase treatment circuit can comprise: with reference to Mike, be used for the acquisition noise signal; Sef-adapting filter is used for the described noise signal that collects with reference to Mike is carried out relevant and Synchronous Processing with ambient noise; Inverter is used for to described sef-adapting filter the noise signal after the relevant and Synchronous Processing and carries out anti-phase processing.Described anti-phase treatment circuit can also comprise successively series connection and described with reference to amplifier and analog to digital converter between Mike and the described sef-adapting filter, wherein: described amplifier is used for described noise signal of gathering with reference to Mike is amplified; Described analog to digital converter is used for the noise signal after the described amplifier amplification is carried out analog-to-digital conversion, and the noise signal after the analog-to-digital conversion is sent to described sef-adapting filter.
In addition, described portable terminal can also comprise: connect successively and digital to analog converter and amplifier between described superimposer and described receiver, wherein: described digital to analog converter, be used for the signal after the described superimposer stack is carried out digital-to-analogue conversion, and the signal after the digital-to-analogue conversion is sent to described amplifier; Described amplifier exports receiver to after being used for the signal that described digital to analog converter sends amplified.Concrete structure as shown in Figure 2.
The operation principle of noise reduction is exactly by real-time collection and analysis to ambient noise, produce one synchronous with it, but the opposite noise signal of phase place, and superpose with the signal of telecommunication or acoustical signal, make noise cancel out each other or decay, thereby reach the purpose that reduces noise.The uplink downlink noise reduction is difference slightly in realization, introduces the noise reduction process of up link and down link below respectively in detail.
The up link noise reduction is cancelling out each other of the signal of telecommunication or decays, as shown in Figure 3, and main Mic and receive voice signal (signal of telecommunication) and ambient noise signal simultaneously with noise with reference to Mic.Because far away apart from caller's mouth with reference to mic, therefore, more main mic is little for the voice signal amplitude.Generally require main mic place to reference to the acoustic attenuation that has between the mic place more than the 6dB.Signal processing technology is relatively ripe, and main Mic and carry out relevant treatment by sef-adapting filter with reference to the output signal of Mic extracts ambient noise, signal as shown in Figure 4, again by the anti-phase output of inverter.Noise signal with anti-phase output is superimposed upon in the voice link of main mic then, and then offsets the noise component(s) in the ascending voice signal, and the ascending voice signal that enters base band is exactly relatively pure voice signal, and this signal as shown in Figure 5; So just reached the purpose of ascending voice reduction noise.
The down link noise reduction is cancelling out each other of acoustical signal or decays.Ambient noise is gathered by reference Mic earlier, then, noise signal process amplifier and A/D converter are to sef-adapting filter, sef-adapting filter is finished the spectrum analysis of noise in real time, and carry out relevant and Synchronous Processing with ambient noise on every side, through the inverter downlink voice link that is added to, export by receiver together again with voice.The treated noise of receiver output is just opposite with on every side ambient noise phase place like this, and amplitude is close, and as shown in Figure 6, two noise sound waves produce in the space and superpose, and will cancel out each other, and then noise energy will decay.And right, the signal to noise ratio of voice will improve greatly relatively, and the definition of voice can be promoted significantly, realizes the purpose of noise reduction.
The embodiment of the invention also provides a kind of method that reduces noise, and this method comprises:
Step 1, will collect carry out anti-phase processing with the synchronous noise signal of ambient noise;
This step can for: the noise signal that collects is amplified and analog-to-digital conversion, the noise signal after the analog-to-digital conversion is carried out relevant and Synchronous Processing with ambient noise, and the noise signal after relevant and the Synchronous Processing is carried out anti-phase processing;
Wherein, relevant treatment is to describe two random signals in any two different t1 constantly, the degree of correlation between the value of t2.Synchronous Processing then is the accuracy that guarantees relevant treatment.Two signals have only in time one to one that to do relevant treatment under the situation just meaningful.
Step 2, the voice signal that the noise signal after the anti-phase processing and described portable terminal are received superpose, and the signal after the output stack.
Signal after the described output stack comprises: the signal after will superposeing carries out being exported by receiver after digital-to-analogue conversion and the processing and amplifying.
The method of above-mentioned reduction noise has not only solved the noise reduction problem under the noisy environment effectively, has also taken into account the transmission quality of voice simultaneously.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, said procedure can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, only with reference to preferred embodiment the present invention is had been described in detail.Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. method that reduces noise is applied to the down link of portable terminal, and this method comprises:
Carry out anti-phase processing with what collect with the synchronous noise signal of ambient noise;
The voice signal that noise signal after the anti-phase processing and described portable terminal are received superposes, and the signal after the output stack.
2. method according to claim 1 is characterized in that:
The synchronous noise signal of described that will collect and ambient noise is carried out anti-phase processing and is comprised:
The noise signal that collects is amplified and analog-to-digital conversion, the noise signal after the analog-to-digital conversion is carried out relevant and Synchronous Processing with ambient noise, and the noise signal after relevant and the Synchronous Processing is carried out anti-phase processing.
3. method according to claim 1 and 2 is characterized in that:
Signal after the described output stack comprises:
Signal after the stack is carried out exporting after digital-to-analogue conversion and the processing and amplifying.
4. portable terminal, this portable terminal comprises:
Anti-phase treatment circuit is used for carrying out anti-phase processing with what collect with the synchronous noise signal of ambient noise:
Superimposer is used for the voice signal that the noise signal after the anti-phase processing of described anti-phase treatment circuit and described portable terminal receive is superposeed; And
Receiver is used to export the signal after described superimposer superposes.
5. portable terminal according to claim 4 is characterized in that:
Described anti-phase treatment circuit comprises:
With reference to Mike, be used for the acquisition noise signal;
Sef-adapting filter is used for the described noise signal that collects with reference to Mike is carried out relevant and Synchronous Processing with ambient noise;
Inverter is used for to described sef-adapting filter the noise signal after the relevant and Synchronous Processing and carries out anti-phase processing.
6. portable terminal according to claim 5 is characterized in that:
Described anti-phase treatment circuit also comprise successively series connection and described with reference to amplifier and analog to digital converter between Mike and the described sef-adapting filter, wherein:
Described amplifier is used for described noise signal with reference to Mike's collection is amplified;
Described analog to digital converter is used for the noise signal after the described amplifier amplification is carried out analog-to-digital conversion, and the noise signal after the analog-to-digital conversion is sent to described sef-adapting filter.
7. portable terminal according to claim 6 is characterized in that, described portable terminal also comprises:
Connect successively and digital to analog converter and amplifier between described superimposer and described receiver, wherein:
Described digital to analog converter is used for the signal after the described superimposer stack is carried out digital-to-analogue conversion, and the signal after the digital-to-analogue conversion is sent to described amplifier;
Described amplifier exports receiver to after being used for the signal that described digital to analog converter sends amplified.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101724384A CN102223428A (en) | 2011-06-24 | 2011-06-24 | Noise reducing method and mobile terminal |
| PCT/CN2011/078637 WO2012174790A1 (en) | 2011-06-24 | 2011-08-19 | Noise reducing method and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101724384A CN102223428A (en) | 2011-06-24 | 2011-06-24 | Noise reducing method and mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102223428A true CN102223428A (en) | 2011-10-19 |
Family
ID=44779852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101724384A Pending CN102223428A (en) | 2011-06-24 | 2011-06-24 | Noise reducing method and mobile terminal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102223428A (en) |
| WO (1) | WO2012174790A1 (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801868A (en) * | 2012-08-28 | 2012-11-28 | 北京北纬点易信息技术有限公司 | System for carrying out real-time environmental noise inhibition in mobile terminal |
| CN103051774A (en) * | 2011-10-14 | 2013-04-17 | 浪潮乐金数字移动通信有限公司 | Mobile terminal based on multi-unit loudspeaker |
| WO2015131634A1 (en) * | 2014-10-11 | 2015-09-11 | 中兴通讯股份有限公司 | Audio noise reduction method and terminal |
| CN105391829A (en) * | 2015-11-26 | 2016-03-09 | Tcl移动通信科技（宁波）有限公司 | Method and system for improving conversation tone quality of mobile terminal |
| CN105489212A (en) * | 2014-09-17 | 2016-04-13 | 中兴通讯股份有限公司 | Downlink active noise reduction device and method, and mobile terminal |
| CN105635914A (en) * | 2016-02-26 | 2016-06-01 | 国家电网公司 | Active noise reduction device used for outdoor power transformation box |
| WO2016177204A1 (en) * | 2015-08-03 | 2016-11-10 | 中兴通讯股份有限公司 | Noise processing method and apparatus |
| CN103051774B (en) * | 2011-10-14 | 2016-12-14 | 浪潮乐金数字移动通信有限公司 | A kind of mobile terminal based on multi-unit loudspeaker |
| CN106331257A (en) * | 2016-08-19 | 2017-01-11 | 青岛海信移动通信技术股份有限公司 | Noise elimination method and apparatus, and communication device |
| CN107071654A (en) * | 2017-05-24 | 2017-08-18 | 歌尔科技有限公司 | A kind of digital noise reduction method, device and a kind of audio-frequence player device |
| CN108462763A (en) * | 2017-02-22 | 2018-08-28 | 南昌黑鲨科技有限公司 | Noise reduction terminal and noise-reduction method |
| CN110198374A (en) * | 2019-05-30 | 2019-09-03 | 深圳市趣创科技有限公司 | A kind of mobile phone speech noise-reduction method and device based on error correction learning rules |
| CN110769111A (en) * | 2019-10-28 | 2020-02-07 | 珠海格力电器股份有限公司 | Noise reduction method, system, storage medium and terminal |
| WO2020048294A1 (en) * | 2018-09-07 | 2020-03-12 | 中兴通讯股份有限公司 | Noise cancelling method, apparatus, device, and storage medium |
| WO2020186740A1 (en) * | 2019-03-20 | 2020-09-24 | 成都天奥信息科技有限公司 | Real-time voice noise reduction system applied to ground-to-air communication |
| CN113327569A (en) * | 2021-05-18 | 2021-08-31 | 杭州爱思维仪器有限公司 | Noise reduction method, system and device for pure-tone audiometer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201260224Y (en) * | 2008-08-04 | 2009-06-17 | 宇龙计算机通信科技(深圳)有限公司 | Noise reducing device and noise reducing mobile terminal |
| WO2009088447A1 (en) * | 2007-12-31 | 2009-07-16 | Qualcomm Incorporated | Portable phone based noise cancellation |
| CN201616843U (en) * | 2010-03-18 | 2010-10-27 | 华为终端有限公司 | Audio frequency device capable of lowering noise and noise reducing mobile phone |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201054780Y (en) * | 2007-06-05 | 2008-04-30 | 炬力集成电路设计有限公司 | Automatic noise reduction earphone |
-
2011
- 2011-06-24 CN CN2011101724384A patent/CN102223428A/en active Pending
- 2011-08-19 WO PCT/CN2011/078637 patent/WO2012174790A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009088447A1 (en) * | 2007-12-31 | 2009-07-16 | Qualcomm Incorporated | Portable phone based noise cancellation |
| CN201260224Y (en) * | 2008-08-04 | 2009-06-17 | 宇龙计算机通信科技(深圳)有限公司 | Noise reducing device and noise reducing mobile terminal |
| CN201616843U (en) * | 2010-03-18 | 2010-10-27 | 华为终端有限公司 | Audio frequency device capable of lowering noise and noise reducing mobile phone |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051774A (en) * | 2011-10-14 | 2013-04-17 | 浪潮乐金数字移动通信有限公司 | Mobile terminal based on multi-unit loudspeaker |
| CN103051774B (en) * | 2011-10-14 | 2016-12-14 | 浪潮乐金数字移动通信有限公司 | A kind of mobile terminal based on multi-unit loudspeaker |
| CN102801868A (en) * | 2012-08-28 | 2012-11-28 | 北京北纬点易信息技术有限公司 | System for carrying out real-time environmental noise inhibition in mobile terminal |
| CN105489212A (en) * | 2014-09-17 | 2016-04-13 | 中兴通讯股份有限公司 | Downlink active noise reduction device and method, and mobile terminal |
| WO2015131634A1 (en) * | 2014-10-11 | 2015-09-11 | 中兴通讯股份有限公司 | Audio noise reduction method and terminal |
| WO2016177204A1 (en) * | 2015-08-03 | 2016-11-10 | 中兴通讯股份有限公司 | Noise processing method and apparatus |
| CN105391829B (en) * | 2015-11-26 | 2019-11-12 | Tcl移动通信科技（宁波）有限公司 | A kind of the call tone quality ameliorative way and system of mobile terminal |
| CN105391829A (en) * | 2015-11-26 | 2016-03-09 | Tcl移动通信科技（宁波）有限公司 | Method and system for improving conversation tone quality of mobile terminal |
| CN105635914A (en) * | 2016-02-26 | 2016-06-01 | 国家电网公司 | Active noise reduction device used for outdoor power transformation box |
| CN106331257A (en) * | 2016-08-19 | 2017-01-11 | 青岛海信移动通信技术股份有限公司 | Noise elimination method and apparatus, and communication device |
| CN106331257B (en) * | 2016-08-19 | 2019-07-02 | 青岛海信移动通信技术股份有限公司 | A kind of method of canceling noise, device and communication equipment |
| CN108462763A (en) * | 2017-02-22 | 2018-08-28 | 南昌黑鲨科技有限公司 | Noise reduction terminal and noise-reduction method |
| CN107071654A (en) * | 2017-05-24 | 2017-08-18 | 歌尔科技有限公司 | A kind of digital noise reduction method, device and a kind of audio-frequence player device |
| WO2020048294A1 (en) * | 2018-09-07 | 2020-03-12 | 中兴通讯股份有限公司 | Noise cancelling method, apparatus, device, and storage medium |
| WO2020186740A1 (en) * | 2019-03-20 | 2020-09-24 | 成都天奥信息科技有限公司 | Real-time voice noise reduction system applied to ground-to-air communication |
| CN110198374A (en) * | 2019-05-30 | 2019-09-03 | 深圳市趣创科技有限公司 | A kind of mobile phone speech noise-reduction method and device based on error correction learning rules |
| CN110769111A (en) * | 2019-10-28 | 2020-02-07 | 珠海格力电器股份有限公司 | Noise reduction method, system, storage medium and terminal |
| CN113327569A (en) * | 2021-05-18 | 2021-08-31 | 杭州爱思维仪器有限公司 | Noise reduction method, system and device for pure-tone audiometer |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012174790A1 (en) | 2012-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102223428A (en) | Noise reducing method and mobile terminal | |
| CN101277331B (en) | Sound reproducing device and sound reproduction method | |
| US7742790B2 (en) | Environmental noise reduction and cancellation for a communication device including for a wireless and cellular telephone | |
| US20070237339A1 (en) | Environmental noise reduction and cancellation for a voice over internet packets (VOIP) communication device | |
| CN104521247B (en) | Bluetooth headset hearing aid and anti-noise method and apparatus | |
| US20070263847A1 (en) | Environmental noise reduction and cancellation for a cellular telephone communication device | |
| CN103379231B (en) | A kind of wireless session phone and carry out the method for voice signal transmission | |
| CN102724360B (en) | Method and device for implementation of hearing-aid function of mobile phone and hearing-aid mobile phone | |
| CN102158778A (en) | Method, equipment and system for reducing headset noise | |
| CN202587132U (en) | Voice call circuit with echo suppression function and flat panel computer | |
| CN102543060A (en) | Active noise control system and design method thereof | |
| CN101641965A (en) | Acoustic processing system and method for electronic device and mobile telephone terminal | |
| CN201054780Y (en) | Automatic noise reduction earphone | |
| CN101437190B (en) | Earphone with hearing-aid function | |
| CN201491082U (en) | Mobile phone | |
| CN2884733Y (en) | Cell phone having double pick-up devices | |
| CN108510997A (en) | Electronic equipment and echo cancel method applied to electronic equipment | |
| CN102044252B (en) | Device and method for eliminating noise | |
| CN203968327U (en) | A kind of exempt from extract carry out low coverage dialogue earphone | |
| CN201708849U (en) | Mobile phone with hearing aid function | |
| CN101360155A (en) | Active noise silencing control system | |
| WO2007120734A2 (en) | Environmental noise reduction and cancellation for cellular telephone and voice over internet packets (voip) communication devices | |
| CN203151729U (en) | Multifunctional earphone | |
| CN112637438B (en) | Entrance guard double-end intercom method and system based on single-line transmission | |
| CN102340565B (en) | De-noising assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20111019 |