CN1797544A - Method and device for voice process at wireless terminal - Google Patents
Method and device for voice process at wireless terminal Download PDFInfo
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- CN1797544A CN1797544A CN 200410103578 CN200410103578A CN1797544A CN 1797544 A CN1797544 A CN 1797544A CN 200410103578 CN200410103578 CN 200410103578 CN 200410103578 A CN200410103578 A CN 200410103578A CN 1797544 A CN1797544 A CN 1797544A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
- G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
- G10L2021/02166—Microphone arrays; Beamforming
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Abstract
The invention discloses a voice processing method for wireless terminal, comprising: receiving a sound signal from voice direction and converting the sound signal into a sound pressure signal, and simultaneously receiving the other sound signal from the second direction and converting it into a sound pressure signal, and amplifying the two sound pressure signals; and differentially processing and outputting them. The invention also discloses a voice processing device for wireless terminal, comprising two microphones, two analog amplifier circuits, and a differential processing circuit, where the two microphones receives the sound signals and convert them into sound pressures signals and input the pressure signals to the analog amplifier circuits, respectively, then the differential processing circuit differential processes the output signals of the analog amplifier circuits, ensuring the wireless terminal can largely reduce noises even though in strong noise environment, and has excellent call quality.
Description
Technical field
The present invention relates to audio signal processing technique, refer to a kind of method and device of wireless terminal speech processes especially.
Background technology
At present, the speech processes scheme is referring to shown in Figure 1 in the wireless terminal, and Fig. 1 is prior art wireless terminal speech processing circuit figure.
Among Fig. 1, resistance R 4 is connected with power supply VCC, and (MIC) provides bias voltage for microphone; Resistance R 1=resistance R 2, resistance R 1 and 2 couples of power supply VCC of resistance R dividing potential drop, for operational amplifier A 1 provides offset operation voltage, and this moment operational amplifier the dynamic range maximum; Capacitor C 1 is used for every directly, and capacitor C 2 is used for filtering; The enlargement factor of this analog amplify circuit operational amplifier A 1 is a resistance R _ f and the ratio of resistance R 3, i.e. enlargement factor β=Rf/R3.Here, the installation direction of MIC in wireless terminal is that the callee of MIC reception voice signal faces toward the people, receives the voice signal from the voice direction.
According to Fig. 1, MIC converts the voice signal that receives to sound electric signal, i.e. sound pressure signal.If the sound pressure signal of MIC output is Vi, comprise voice sound pressure signal V1 and neighbourhood noise sound pressure signal Vcm among the Vi, then through the output voltage signal behind this analog amplify circuit be:
Vo=(V1+Vcm) * Rf/R3+ (R2/ (R1+R2)) * VCC is because R1=R2, so,
Vo＝β×(V1+Vcm)+VCC/2 ...(1)
From formula (1) as can be seen, in the sound pressure signal of MIC output, comprise voice sound pressure signal and neighbourhood noise sound pressure signal simultaneously, prior art is not separated with neighbourhood noise voice, sends into audio coder but simultaneously they are inserted after analog amplify circuit amplifies.
As can be seen from Figure 1, in the prior art, wireless terminal only adopts MIC to receive voice signal, and promptly sends into audio coder after using a cover simulation amplifying circuit that the sound pressure signal of MIC output is amplified.
Like this, under strong noise environment, such as building site, workshop, the first-class use wireless terminal of bus, owing to neighbourhood noise is not carried out necessary processing, can cause a large amount of neighbourhood noises to be entrained in the voice, through after the existing wireless terminal speech processes, can make can not hear clearly the other side's voice of take over party; The caller will raise one's voice simultaneously, and to increase the voice sound pressure, conversing painstakingly could guarantee not hearing reluctantly.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of method of wireless terminal speech processes, and this method can reduce the influence of neighbourhood noise to conversation, reduces noise greatly, thereby guarantees the speech quality of wireless terminal well.
Another object of the present invention is to provide a kind of device of wireless terminal speech processes, this apparatus structure is simple, can reduce the influence of neighbourhood noise easily, weaken the neighbourhood noise sound pressure signal greatly, thereby guarantee the speech quality of wireless terminal well conversation.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method of wireless terminal speech processes may further comprise the steps:
A. the voice signal that receives from voice direction also converts this voice signal to sound pressure signal, receive from the voice signal of other direction simultaneously and convert this voice signal to sound pressure signal, the sound pressure signal to the different directions that receives carries out processing and amplifying respectively;
B. the sound pressure signal through the different directions after the processing and amplifying is carried out exporting after the difference processing.
The enlargement factor of processing and amplifying described in this method step A equates.
The described difference processing of this method step B comprises: the sound pressure signal to described different directions carries out making digital difference processing after the analog/digital conversion.
Other direction described in this method step A is the direction opposite with the sound input direction of wireless terminal.
The device of a kind of wireless terminal voice front-end processing, this device comprise the first microphone MIC, are used to receive from the voice signal of the phonetic entry direction of wireless terminal and convert this voice signal to sound pressure signal; First analog amplify circuit is used to amplify the sound pressure signal from a MIC; It is characterized in that this device also comprises:
The 2nd MIC, the voice signal that is used to receive from the direction beyond the phonetic entry direction of wireless terminal also converts this voice signal to sound pressure signal;
Second analog amplify circuit is used to amplify the sound pressure signal from the 2nd MIC;
The difference processing circuit is used to receive respectively the output sound pressure signal after amplifying from first analog amplify circuit and second analog amplify circuit, and the two-way sound pressure signal is carried out difference processing.
This callee face that installs the callee of a described MIC and the 2nd MIC in the opposite direction.
This enlargement factor of installing described first analog amplify circuit equates with the enlargement factor of second analog amplify circuit.
This installs described difference processing circuit and comprises first resistance R 5, second resistance R 6, the 3rd resistance R 7, the 4th resistance R 8 and operational amplifier A 3;
One end of first resistance R 5 is connected to the first analog amplify circuit output terminal, and the other end is connected the reverse input end of operational amplifier A 3 and an end of the 3rd resistance R 7, the other end ground connection of the 3rd resistance R 7 simultaneously;
One end of second resistance R 6 is connected to the second analog amplify circuit output terminal, and the other end is connected the input end in the same way of operational amplifier A 3 and an end of the 4th resistance R 8 simultaneously, and the other end of resistance R 8 is connected on the output terminal of operational amplifier A 3;
Wherein, first resistance R 5 equates with second resistance R, 6 resistances; The 3rd resistance R 7 equates with the 4th resistance R 8 resistances.
This installs described operational amplifier A 3 and is the single power supply operational amplifier.
This installs described difference processing circuit is digital signal processor DSP.
As seen from the above technical solution, the inventive method adopts two MIC to receive and exports after voice signal also converts this voice signal to sound pressure signal, and wherein a MIC mainly exports the voice sound pressure signal, the main output environment noise of another MIC sound pressure signal; And respectively voice sound pressure signal and the neighbourhood noise sound pressure signal of exporting amplified, again the result after amplifying is carried out sending into audio coder after the difference processing afterwards.The inventive method has improved the speech quality of wireless terminal under strong noise environment.Two MIC of apparatus of the present invention employing, two cover simulation amplifying circuits and a cover difference processing circuit are finished the processing to wireless terminal voice front end.Apparatus of the present invention are simple in structure, realized easily and flexibly separating voice sound pressure signal and the neighbourhood noise sound pressure signal that wireless terminal MIC receives, and especially can guarantee the speech quality of wireless terminal under strong noise environment.
Description of drawings
Fig. 1 is prior art wireless terminal speech processing circuit figure;
Fig. 2 is a wireless terminal speech processes block diagram of the present invention;
Fig. 3 is a wireless terminal speech processing circuit structural representation of the present invention.
Embodiment
Core concept of the present invention is: adopt two MIC to receive voice signal, wherein the main recipient's acoustic sound of a MIC signal also becomes sound pressure signal with this conversion of signals, amplifies an end of back input difference treatment circuit through analog amplify circuit; The main reception environment noise sound of another MIC signal also becomes the noise sound pressure signal with this conversion of signals, through the other end of input difference treatment circuit behind the analog amplify circuit; Difference channel carries out difference processing to two input signals, has weakened the neighbourhood noise sound pressure signal greatly, and the output sound pressure signal that makes the difference processing circuit mainly is the voice sound pressure signal, and the sound pressure signal of sending into audio coder like this mainly is the voice sound pressure signal.Processing by such has guaranteed speech quality of both sides.
Fig. 2 is a wireless terminal speech processes block diagram of the present invention, and as can be seen from Fig. 2, apparatus of the present invention also comprise another MIC2 except comprising an existing MIC1 and a cover simulation amplifying circuit 1; An another set of analog amplify circuit 2 and a cover difference processing circuit.
MIC1 exports after being used to receive voice signal and converting this voice signal to sound pressure signal, reception mainly be voice voice signal in the voice signal; Analog amplify circuit 1 is used to amplify the sound pressure signal from MIC1;
MIC2 exports after being used to receive voice signal and converting this voice signal to sound pressure signal, reception mainly be neighbourhood noise voice signal in the voice signal;
Analog amplify circuit 2 is used to amplify the sound pressure signal from MIC2;
The difference processing circuit is used to receive respectively the output sound pressure signal after amplifying from analog amplify circuit 1 and analog amplify circuit 2, and two kinds of sound pressure signals are carried out difference processing.
Here, in order to guarantee the wherein main recipient's acoustic sound of MIC1 signal, and the main reception environment noise sound of another MIC2 signal, the mode that can adopt two MIC to install back-to-back, such as, MIC1 receives the callee of voice signal facing to the people, reception is from the voice signal of voice direction, consistent with the installation direction of existing MIC, and MIC2 and MIC1 install back-to-back, MIC2 receives the callee of voice signal back to the people, and promptly the callee face of the callee of MIC1 and MIC2 in the opposite direction.Because the directivity of voice is stronger, so, the voice voice signal that receives over against people's MIC1 is stronger, and the voice voice signal that the MIC2 at the back side receives a little less than; And the directivity of neighbourhood noise is relatively poor, so the neighbourhood noise sound that MIC1 and MIC2 receive is more or less the same.
Below with reference to Fig. 2, the inventive method is described below:
At first, respectively with the different sound pressure signal of MIC1 with MIC2 output: the sound pressure signal of establishing MIC1 output is Vi1, and wherein the voice sound pressure signal is V1, and the neighbourhood noise sound pressure signal is Vcm1; If the sound pressure signal of MIC2 output is Vi2, wherein the voice sound pressure signal is V2, and the neighbourhood noise sound pressure signal is Vcm2.According to above-mentioned MIC1, MIC2 mounting means, so, V1＞＞V2, Vcm1 ≈ Vcm2.
Then, respectively Vi1 and Vi2 are amplified, here, the parameter of analog amplify circuit 1 and analog amplify circuit 2 can be consistent, i.e. the enlargement factor unanimity of two circuit, i.e. β 1=β 2=β.It is Vo1 that Vi1 amplifies back output sound pressure signal through analog amplify circuit 1, and it is Vo2 that Vi2 amplifies back output sound pressure signal through analog amplify circuit 2,
Vo1=β (V1+Vcm1), Vo2=β (V2+Vcm2) are then arranged
At last, with the reverse input end of the output sound pressure signal Vo1 input difference treatment circuit of analog amplify circuit 1, promptly+end; With the input end in the same way of the output sound pressure signal Vo2 input difference treatment circuit of analog amplify circuit 2, promptly-end, the enlargement factor of supposing the operational amplifier A 3 of difference processing circuit here is β 3, then Vo=β 3 * (Vo1-Vo2),
Be Vo=β 3 * (β (V1+Vcm1)-β (V2+Vcm2)),
Also be Vo ≈ β 3 * (≈ β 3 * β * V1 of β * V1-β * V2) ... (2)
From formula (2) as can be seen, after the processing through the inventive method and device thereof, the sound pressure signal of sending into audio coder almost has only the voice sound pressure signal V1 of MIC1 output through the sound pressure signal after the processing and amplifying, and the neighbourhood noise sound pressure signal is offset after through the difference processing circuit greatly, even so just guaranteed that wireless terminal is under strong noise environment, also can have good speech quality, the caller also needn't raise one's voice again and converse arduously.
In addition, for the difference processing circuit, can also adopt digital signal processor (DSP) to realize:
Analog/digital conversion (A/D) port with the output sound pressure signal Vo2 input DSP of the output sound pressure signal Vo1 of analog amplify circuit 1 and analog amplify circuit 2, DSP carries out the digital differential processing to Vo1 after changing and Vo2 digital signal then, disposal route also is Vo=β 3 * (Vo1-Vo2), and just the signal here all is a digital signal.Vo digital signal after last DSP will handle is exported to audio coder after changing (D/A) through digital-to-analog.Processing can guarantee signal accuracy better like this.
Here need explanation a bit: A/D conversion and D/A conversion can be the translation functions that adopts DSP self to have, and also can be to adopt special-purpose A/D conversion chip or D/A conversion chip.
Fig. 3 is a wireless terminal speech processing circuit structural representation of the present invention, as an embodiment, below the inventive method and device thereof is described in detail:
Comprise two microphones among Fig. 3, MIC1 and MIC2, wherein the MIC1 direction is facing to the people, is mainly used in recipient's acoustic sound signal and this conversion of signals is grown up to export behind several pressure signals; MIC2 and MIC1 install back-to-back, are mainly used in to export after reception environment noise sound signal also becomes sound pressure signal with this conversion of signals.
Comprise also among Fig. 3 that analog amplify circuit 1 is used to amplify the voice sound pressure signal of MIC1 output, analog amplify circuit 2 is used to amplify the neighbourhood noise sound pressure signal of MIC2 output.Hypothetical simulation amplifying circuit 1 is consistent with the circuit parameter of analog amplify circuit 2:
Resistance R 14 or R24 are connected with power supply VCC, for MIC1 or MIC2 provide bias voltage; Resistance R 11=resistance R 12, resistance R 11 and 12 couples of power supply VCC of resistance R dividing potential drop, for operational amplifier A 1 provides offset operation voltage, and this moment operational amplifier the dynamic range maximum; Equally, resistance R 21=resistance R 22, resistance R 21 and 22 couples of power supply VCC of resistance R dividing potential drop, for operational amplifier A 2 provides offset operation voltage, and this moment operational amplifier the dynamic range maximum.
Capacitor C 11 or capacitor C 21 are used for every directly, and capacitor C 12 or capacitor C 22 are used for filtering; The enlargement factor of analog amplify circuit 1 is a resistance R _ f 1 and the ratio of resistance R 13, i.e. enlargement factor β 1=Rf1/R13; The enlargement factor of analog amplify circuit 2 is resistance R _ f 2 and the ratio of resistance R 23, i.e. enlargement factor β 2=Rf2/R23.Because two cover simulation amplifying circuit parameters are consistent, so,
β 1=β 2=Rf1/R13=Rf2/R23, establishes β 1=β 2=β here
Outside, also comprise the difference processing circuit among Fig. 3, be used for the output sound pressure signal from analog amplify circuit 1 and analog amplify circuit road 2 is respectively carried out difference processing, through after the difference processing, keep the voice sound pressure signal, offset the neighbourhood noise sound pressure signal.
A termination of resistance R 5 is received from analog amplify circuit 1 output sound pressure signal in the difference processing circuit, and the other end is connected the reverse input end of operational amplifier A 3 and an end of resistance R 7, the other end ground connection of resistance R 7 simultaneously;
One termination of resistance R 6 is received from analog amplify circuit 2 output sound pressure signals, and the other end is connected the input end in the same way of operational amplifier A 3 and an end of resistance R 8 simultaneously, and the other end of resistance R 8 is connected on the output terminal of operational amplifier A 3;
Wherein, resistance R 5=resistance R 6, resistance R 7=resistance R 8, the enlargement factor β 3=R7/R5 of operational amplifier A 3.
The sound pressure signal of supposing MIC1 output is Vi1, and wherein the voice sound pressure signal is V1, and the neighbourhood noise sound pressure signal is Vcm1; The sound pressure signal of MIC2 output is Vi2, and wherein the voice sound pressure signal is V2, and the neighbourhood noise sound pressure signal is Vcm2.Because the MIC1 direction is facing to the people, and MIC2 and MIC1 install back-to-back, have so,
V1＞＞V2，Vcm1≈Vcm2。
Respectively Vi1 and Vi2 are inputed to analog amplify circuit 1 and analog amplify circuit 2, then have,
Vo1＝β(V1+Vcm1)+VCC/2，Vo2＝β(V2+Vcm2)+VCC/2
At last, with the reverse input end of the operational amplifier A 3 of the output voltage V o1 input difference treatment circuit of analog amplify circuit 1, promptly+end; With the input end in the same way of the operational amplifier A 3 of the output voltage V o2 input difference treatment circuit of analog amplify circuit 2, promptly-end, then
Vo＝β3×(Vo1-Vo2)，
Be Vo=β 3 * (β (V1+Vcm1)+VCC/2-β (V2+Vcm2)-VCC/2),
Also be Vo ≈ β 3 * (≈ β 3 * β * V1 of β * V1-β * V2)
Like this, after the processing through the inventive method and device thereof, the sound pressure signal of sending into audio coder almost has only the voice sound pressure signal V1 of MIC1 output through the sound pressure signal after the processing and amplifying, and ambient noise signal is offset after through the difference processing circuit greatly, even guaranteed that like this wireless terminal is under strong noise environment, also can have good speech quality, the caller also needn't raise one's voice again and converse arduously.
In order to guarantee the precision of difference processing circuit, operational amplifier A 3 is the single power supply operational amplifier here, for example the TLV2472 operational amplifier of company of Texas Instrument (TI).In order to guarantee the operate as normal of difference processing circuit, must guarantee resistance R 5=resistance R 6, resistance R 7=resistance R 8 simultaneously.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the method for a wireless terminal speech processes is characterized in that, this method may further comprise the steps:
A. the voice signal that receives from voice direction also converts this voice signal to sound pressure signal, receive from the voice signal of other direction simultaneously and convert this voice signal to sound pressure signal, the sound pressure signal to the different directions that receives carries out processing and amplifying respectively;
B. the sound pressure signal through the different directions after the processing and amplifying is carried out exporting after the difference processing.
2. method according to claim 1 is characterized in that: the enlargement factor of processing and amplifying described in the steps A equates.
3. method according to claim 1 is characterized in that, the described difference processing of step B comprises: the sound pressure signal to described different directions carries out making digital difference processing after the analog/digital conversion.
4. method according to claim 1 is characterized in that: other direction described in the steps A is the direction opposite with the sound input direction of wireless terminal.
5. the device of wireless terminal voice front-end processing, this device comprises the first microphone MIC, is used to receive from the voice signal of the phonetic entry direction of wireless terminal and converts this voice signal to sound pressure signal; First analog amplify circuit is used to amplify the sound pressure signal from a MIC; It is characterized in that this device also comprises:
The 2nd MIC, the voice signal that is used to receive from the direction beyond the phonetic entry direction of wireless terminal also converts this voice signal to sound pressure signal;
Second analog amplify circuit is used to amplify the sound pressure signal from the 2nd MIC;
The difference processing circuit is used to receive respectively the output sound pressure signal after amplifying from first analog amplify circuit and second analog amplify circuit, and the two-way sound pressure signal is carried out difference processing.
6. device according to claim 5 is characterized in that: the callee face of the callee of a described MIC and the 2nd MIC in the opposite direction.
7. device according to claim 5 is characterized in that: the enlargement factor of described first analog amplify circuit equates with the enlargement factor of second analog amplify circuit.
8. device according to claim 5 is characterized in that: described difference processing circuit comprises first resistance R 5, second resistance R 6, the 3rd resistance R 7, the 4th resistance R 8 and operational amplifier A 3;
One end of first resistance R 5 is connected to the first analog amplify circuit output terminal, and the other end is connected the reverse input end of operational amplifier A 3 and an end of the 3rd resistance R 7, the other end ground connection of the 3rd resistance R 7 simultaneously;
One end of second resistance R 6 is connected to the second analog amplify circuit output terminal, and the other end is connected the input end in the same way of operational amplifier A 3 and an end of the 4th resistance R 8 simultaneously, and the other end of resistance R 8 is connected on the output terminal of operational amplifier A 3;
Wherein, first resistance R 5 equates with second resistance R, 6 resistances; The 3rd resistance R 7 equates with the 4th resistance R 8 resistances.
9. device according to claim 8 is characterized in that: described operational amplifier A 3 is the single power supply operational amplifier.
10. device according to claim 5 is characterized in that, described difference processing circuit is a digital signal processor DSP.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2004101035786A CN100407293C (en) | 2004-12-30 | 2004-12-30 | Method and device for voice process at wireless terminal |
| PCT/CN2005/002399 WO2006069546A1 (en) | 2004-12-30 | 2005-12-30 | A speech processing approach and device of a wireless terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2004101035786A CN100407293C (en) | 2004-12-30 | 2004-12-30 | Method and device for voice process at wireless terminal |
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| Publication Number | Publication Date |
|---|---|
| CN1797544A true CN1797544A (en) | 2006-07-05 |
| CN100407293C CN100407293C (en) | 2008-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2004101035786A Active CN100407293C (en) | 2004-12-30 | 2004-12-30 | Method and device for voice process at wireless terminal |
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|---|---|
| CN (1) | CN100407293C (en) |
| WO (1) | WO2006069546A1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188875A (en) * | 2006-10-27 | 2008-05-28 | 安华高科技无线Ip（新加坡）私人有限公司 | Piezoelectric microphones |
| WO2013107307A1 (en) * | 2012-01-16 | 2013-07-25 | 华为终端有限公司 | Noise reduction method and device |
| US8824698B2 (en) | 2008-05-20 | 2014-09-02 | Funai Electric Advanced Applied Technology Research Institute Inc. | Integrated circuit device, voice input device and information processing system |
| CN104505099A (en) * | 2014-12-08 | 2015-04-08 | 北京云知声信息技术有限公司 | Method and equipment for removing known interference in voice signal |
| WO2015131634A1 (en) * | 2014-10-11 | 2015-09-11 | 中兴通讯股份有限公司 | Audio noise reduction method and terminal |
| CN105049970A (en) * | 2014-04-15 | 2015-11-11 | 快捷半导体(苏州)有限公司 | AUDIO ACCESSORY system, advanced slave circuit and audio jack ACCESSORY COMMUNICATION method |
| CN105635866A (en) * | 2016-02-26 | 2016-06-01 | 深圳市优科威科技有限公司 | Method and device for removing noise by adopting multiple microphones |
| CN107331407A (en) * | 2017-06-21 | 2017-11-07 | 深圳市泰衡诺科技有限公司 | Descending call noise-reduction method and device |
| CN108337353A (en) * | 2014-07-28 | 2018-07-27 | 华为技术有限公司 | The audio signal processing method and equipment of communication equipment |
| CN111356908A (en) * | 2017-09-29 | 2020-06-30 | 深圳传音通讯有限公司 | Noise reduction method and terminal |
| CN112086101A (en) * | 2020-08-19 | 2020-12-15 | 广州亚美智造科技有限公司 | Noise reduction circuit, voice recognition module and electronic equipment |
| CN114279625A (en) * | 2021-12-03 | 2022-04-05 | 北京晨晶精仪电子有限公司 | Vacuum degree detection circuit, vacuum degree detection method and vacuum gauge |
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| CN109378009B (en) * | 2018-09-21 | 2023-06-27 | 中国航空无线电电子研究所 | Airborne warning voice output device |
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| JPS6145638A (en) * | 1984-08-09 | 1986-03-05 | Mitsubishi Electric Corp | Portable type radio set |
| JPH04216597A (en) * | 1990-12-17 | 1992-08-06 | Nec Eng Ltd | Background noise eliminating circuit of voice recognition device |
| CN1209889C (en) * | 2003-04-21 | 2005-07-06 | 徐忠义 | Phoneme background noise inhibitor |
| JP2004361938A (en) * | 2003-05-15 | 2004-12-24 | Takenaka Komuten Co Ltd | Noise reduction device |
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- 2004-12-30 CN CN2004101035786A patent/CN100407293C/en active Active
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- 2005-12-30 WO PCT/CN2005/002399 patent/WO2006069546A1/en not_active Application Discontinuation
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| US8369555B2 (en) | 2006-10-27 | 2013-02-05 | Avago Technologies Wireless Ip (Singapore) Pte. Ltd. | Piezoelectric microphones |
| CN101188875A (en) * | 2006-10-27 | 2008-05-28 | 安华高科技无线Ip（新加坡）私人有限公司 | Piezoelectric microphones |
| CN101188875B (en) * | 2006-10-27 | 2016-06-08 | 安华高科技通用Ip(新加坡)公司 | Piezoelectric microphones |
| US8824698B2 (en) | 2008-05-20 | 2014-09-02 | Funai Electric Advanced Applied Technology Research Institute Inc. | Integrated circuit device, voice input device and information processing system |
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| CN114279625A (en) * | 2021-12-03 | 2022-04-05 | 北京晨晶精仪电子有限公司 | Vacuum degree detection circuit, vacuum degree detection method and vacuum gauge |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN100407293C (en) | 2008-07-30 |
| WO2006069546A1 (en) | 2006-07-06 |
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