CN101123629A - An environmental noise filtering method and device for mobile phone - Google Patents
An environmental noise filtering method and device for mobile phone Download PDFInfo
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- CN101123629A CN101123629A CNA2006100298001A CN200610029800A CN101123629A CN 101123629 A CN101123629 A CN 101123629A CN A2006100298001 A CNA2006100298001 A CN A2006100298001A CN 200610029800 A CN200610029800 A CN 200610029800A CN 101123629 A CN101123629 A CN 101123629A
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Abstract
The invention discloses an environmental noise filtration method and device. The invention can largely weaken the effect of outside noise on speaking voice and greatly improves communication quality. An art scheme of the invention is that the method and device collect the environmental noise through a first pickup equipment, collect the communication voice including the environmental noise through a second pickup equipment, connect the differential amplification circuits of the first and the second pickup equipments through a connection, and output the difference of the environmental noise signal and the communication voice signal after the amplification. The invention can be applied to all speaking systems, which utilize a microphone.
Description
Technical field
The present invention relates to a kind of environmental noise filtering method and device, relate in particular to a kind of method and apparatus that solves external environmental noise to the influence of mobile phone calling quality.
Background technology
Usually, when the intelligencer made a phone call, the noise of its one's voice in speech and surrounding environment all can pass in the microphone of mobile phone, passed in those who answer's the ear.If ambient noise is less, can be very not big to the influence of communication quality.If the next door is the crowd of clamour or has locomotive rumbling to cross that those who answer just is difficult to hear intelligencer's sound.
Existing way is that a sound thresholding is set, when sound just can be transmitted during greater than this threshold value.If noise is very little and when not surpassing this threshold value, this way is effective, noise is not transmitted.But the noise that surpasses threshold value still can be transmitted, and this way does not play corresponding effect.
Summary of the invention
The objective of the invention is to address the above problem, a kind of environmental noise filtering method and device are provided, it can weaken the influence of external noise to the sound of speaking significantly, improves communication quality greatly.
Technical scheme of the present invention is: a kind of environmental noise filtering device that is used for mobile phone, be used to eliminate the influence of ambient noise to mobile phone, and wherein, described device comprises:
One first pick up facility is used to gather ambient noise;
One second pick up facility is used to gather the conversation sound that comprises ambient noise;
One differential amplifier circuit connects described first pick up facility and second pick up facility, and the ambient noise signal and the difference of conversation voice signal are amplified back output.
The above-mentioned environmental noise filtering device that is used for mobile phone, wherein, described first pick up facility and second pick up facility are microphones.
The above-mentioned environmental noise filtering device that is used for mobile phone, wherein, described first pick up facility is placed on distance sound position far away in a minute, and described second pick up facility is placed on from the nearer position of caller.
The above-mentioned environmental noise filtering device that is used for mobile phone, wherein, described differential amplifier circuit further comprises:
One follower circuit is connected the output of described first pick up facility and second pick up facility, reception environment noise signal and comprise the conversation voice signal of ambient noise;
One subtracter is connected after the described follower circuit, the difference of output environment noise signal and conversation voice signal;
One capacitance is connected after the described subtracter, filters out AC signal and output from the output signal of subtracter.
The above-mentioned environmental noise filtering device that is used for mobile phone, wherein, described follower circuit is formed in parallel by two amplifiers, and wherein first amplifier connects described first pick up facility, and second amplifier connects described second pick up facility.
The above-mentioned environmental noise filtering device that is used for mobile phone, wherein, described subtracter is an amplifier.
A kind of environmental noise filtering method that is used for mobile phone is used to eliminate the influence of ambient noise to mobile phone, and wherein, described method comprises:
Use pick up facility to gather ambient noise and the conversation sound that comprises ambient noise;
Ambient noise signal and conversation voice signal are subtracted each other, and the difference signal after will subtracting each other amplifies.
The above-mentioned noise filtering method that is used for mobile phone, wherein, described pick up facility is a microphone.
The above-mentioned noise filtering method that is used for mobile phone wherein, uses differential amplifier circuit that ambient noise signal and conversation voice signal are subtracted each other and amplify.
The above-mentioned noise filtering method that is used for mobile phone, wherein, described method also comprises: filter out AC signal the difference signal after amplifying.
The present invention contrasts prior art following beneficial effect: the present invention utilizes two pick up facilities reception environment noise and the conversation sound that comprises ambient noise respectively, by a differential amplifier ambient noise signal and conversation voice signal is subtracted each other to remove ambient noise.The contrast prior art, the present invention is simple and effective, can not produce unnecessary overhead, and can be used for the phone system of various use microphones.
Description of drawings
Fig. 1 is the block diagram of noise filtering device one preferred embodiment of the present invention.
Fig. 2 is the circuit diagram of the differential amplifier circuit of Fig. 1 embodiment.
Fig. 3 is the flow chart of noise filtering method one preferred embodiment of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 shows a preferred embodiment of noise filtering device of the present invention.As shown in Figure 1, this noise filtering device 1 comprises two microphones and the differential amplifier circuit 12 that is attached thereto.Wherein pick up microphone 10 that voice uses and be placed on from the closer position of caller receiving telephone user's sound, its actual signal that receives is the pure conversation voice signal and the stack of ambient noise signal, has promptly comprised the conversation sound of ambient noise.The microphone 11 that pick-up noise is used is placed on apart from the distant position of voice sound to receive the noise of surrounding environment, such as being placed on the mobile phone back side or the earpiece back side etc., can decide according to concrete structure.Differential amplifier circuit 12 is connected after two microphones, and ambient noise signal that receives and the conversation voice signal that comprises ambient noise are subtracted each other to remove ambient noise, obtains pure conversation voice signal and amplifies output.
Fig. 2 shows the physical circuit of differential amplifier circuit among Fig. 1 embodiment.As shown in Figure 2, this differential amplifier circuit comprises the follower circuit that is formed in parallel by two amplifiers 121,122, is connected on subtracter 123 and capacitance 124 after the follower circuit.The microphone 10 that voice is used is picked up in the input connection of amplifier 121, and the voltage negative of output feeds back to the inverting input of self.Similarly, the input of amplifier 122 connects the microphone 11 that pick-up noise is used, and the voltage negative of output feeds back to the inverting input of self.Follower circuit has high input impedance and low output impedance, and input signal is identical with the phase place of output signal.In the present embodiment, subtracter 123 also is an integrated transporting discharging, and input connects the output of amplifier 121 and 122 respectively, reception environment noise signal and the conversation voice signal that comprises ambient noise signal, the difference of two signals of output.The output of subtracter 123 connects capacitance 124, and capacitance 124 filters out AC signal and is sent in the Audio Processing chip 2.
Because the signal that picks up in the microphone 10 that voice uses is the stack of ambient noise and pure voice, and the signal in the microphone 11 that pick-up noise is used has only ambient noise, therefore these two signals have just obtained pure voice after subtraction circuit subtracts each other, thereby have reached the purpose with noise filtering.
The circuit structure that should be understood that Fig. 2 is a kind of example, and other circuit that plays similar effect all should comprise in the present invention.
Fig. 3 shows a flow process of noise filtering method of the present invention.See also Fig. 3, filter method comprises following step.
Step S1: the conversation sound that uses pick up facility such as microphone for example to gather ambient noise and comprise ambient noise.
Step S2: use differential amplifier circuit that ambient noise signal that collects among the step S1 and the conversation voice signal that comprises ambient noise are subtracted each other, the difference that obtains is pure conversation voice signal, exports after remaking processing and amplifying.
Step S3: from the output signal of step S2, filter out AC signal.
Through above-mentioned steps, this AC signal can convert digital signal to by Audio Processing, is used for follow-up transmission or other processing.
Should be understood that noise filtering method and apparatus of the present invention also can be applicable to the telephone system of awarding of various use microphones.
The foregoing description provides to those of ordinary skills and realizes or use of the present invention; those of ordinary skills can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (10)
1. an environmental noise filtering device that is used for mobile phone is used to eliminate the influence of ambient noise to mobile phone, it is characterized in that described device comprises:
One first pick up facility is used to gather ambient noise;
One second pick up facility is used to gather the conversation sound that comprises ambient noise;
One differential amplifier circuit connects described first pick up facility and second pick up facility, and the ambient noise signal and the difference of conversation voice signal are amplified back output.
2. the environmental noise filtering device that is used for mobile phone according to claim 1 is characterized in that described first pick up facility and second pick up facility are microphones.
3. the environmental noise filtering device that is used for mobile phone according to claim 2 is characterized in that, described first pick up facility is placed on distance sound position far away in a minute, and described second pick up facility is placed on from the nearer position of caller.
4. the environmental noise filtering device that is used for mobile phone according to claim 1 is characterized in that described differential amplifier circuit further comprises:
One follower circuit is connected the output of described first pick up facility and second pick up facility, reception environment noise signal and comprise the conversation voice signal of ambient noise;
One subtracter is connected after the described follower circuit, the difference of output environment noise signal and conversation voice signal;
One capacitance is connected after the described subtracter, filters out AC signal and output from the output signal of subtracter.
5. the environmental noise filtering device that is used for mobile phone according to claim 4 is characterized in that described follower circuit is formed in parallel by two amplifiers, and wherein first amplifier connects described first pick up facility, and second amplifier connects described second pick up facility.
6. the environmental noise filtering device that is used for mobile phone according to claim 4 is characterized in that, described subtracter is an amplifier.
7. an environmental noise filtering method that is used for mobile phone is used to eliminate the influence of ambient noise to mobile phone, it is characterized in that described method comprises:
Use pick up facility to gather ambient noise and the conversation sound that comprises ambient noise;
Ambient noise signal and conversation voice signal are subtracted each other, and the difference signal after will subtracting each other amplifies.
8. the noise filtering method that is used for mobile phone according to claim 7 is characterized in that described pick up facility is a microphone.
9. the noise filtering method that is used for mobile phone according to claim 7 is characterized in that, uses differential amplifier circuit that ambient noise signal and conversation voice signal are subtracted each other and amplify.
10. the noise filtering method that is used for mobile phone according to claim 7 is characterized in that described method also comprises: filter out AC signal the difference signal after amplifying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100298001A CN101123629A (en) | 2006-08-08 | 2006-08-08 | An environmental noise filtering method and device for mobile phone |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006100298001A CN101123629A (en) | 2006-08-08 | 2006-08-08 | An environmental noise filtering method and device for mobile phone |
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| CN101123629A true CN101123629A (en) | 2008-02-13 |
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| CNA2006100298001A Pending CN101123629A (en) | 2006-08-08 | 2006-08-08 | An environmental noise filtering method and device for mobile phone |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145278A1 (en) * | 2009-09-23 | 2010-12-23 | 中兴通讯股份有限公司 | Device and method for eliminating environmental noise |
| WO2011153779A1 (en) * | 2010-06-09 | 2011-12-15 | 中兴通讯股份有限公司 | Method and terminal for noise suppression using dual-microphone |
| CN102340562A (en) * | 2010-07-22 | 2012-02-01 | 杭州华三通信技术有限公司 | Phone for realizing noise reduction of voice input signal of hand-free microphone and noise reduction method |
| CN102456352A (en) * | 2010-10-26 | 2012-05-16 | 深圳Tcl新技术有限公司 | Background audio frequency processing device and method |
| CN102984639A (en) * | 2012-11-08 | 2013-03-20 | 长春芬达电子有限公司 | Hearing aid and training and entertainment system for deaf mutes |
| CN104703091A (en) * | 2013-12-06 | 2015-06-10 | 上海果壳电子有限公司 | Wearable equipment provided with noise elimination device |
| WO2015096440A1 (en) * | 2013-12-24 | 2015-07-02 | 中兴通讯股份有限公司 | Microphone apparatus and earphone |
| CN104780481A (en) * | 2015-03-31 | 2015-07-15 | 袁晶 | Microphone device and sound system |
| CN105577909A (en) * | 2015-05-26 | 2016-05-11 | 东莞酷派软件技术有限公司 | Denoising method and device |
| CN106373586A (en) * | 2015-07-24 | 2017-02-01 | 南宁富桂精密工业有限公司 | Noise filtering circuit |
| CN107764897A (en) * | 2017-10-17 | 2018-03-06 | 四川升拓检测技术股份有限公司 | Contactless continuous-moving type lossless detection method based on air acceleration |
| CN108886647A (en) * | 2018-04-04 | 2018-11-23 | 万魔声学科技有限公司 | Earphone noise-reduction method and device, main earphone, from earphone and earphone noise reduction system |
| CN109547883A (en) * | 2017-09-14 | 2019-03-29 | Ess技术有限公司 | Determine the circuit influence on the environment of electrical load device and method |
| CN110352334A (en) * | 2017-08-31 | 2019-10-18 | 深圳市大疆创新科技有限公司 | Hit detection method, strike detection device and armoring trolley |
| CN111537851A (en) * | 2020-05-22 | 2020-08-14 | 刘莹雪 | Cable monitoring system based on Internet of things |
| CN114501236A (en) * | 2022-01-25 | 2022-05-13 | 中核安科锐(天津)医疗科技有限责任公司 | Noise reduction pickup apparatus and noise reduction pickup method |
-
2006
- 2006-08-08 CN CNA2006100298001A patent/CN101123629A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145278A1 (en) * | 2009-09-23 | 2010-12-23 | 中兴通讯股份有限公司 | Device and method for eliminating environmental noise |
| WO2011153779A1 (en) * | 2010-06-09 | 2011-12-15 | 中兴通讯股份有限公司 | Method and terminal for noise suppression using dual-microphone |
| CN102340562A (en) * | 2010-07-22 | 2012-02-01 | 杭州华三通信技术有限公司 | Phone for realizing noise reduction of voice input signal of hand-free microphone and noise reduction method |
| CN102456352A (en) * | 2010-10-26 | 2012-05-16 | 深圳Tcl新技术有限公司 | Background audio frequency processing device and method |
| CN102984639A (en) * | 2012-11-08 | 2013-03-20 | 长春芬达电子有限公司 | Hearing aid and training and entertainment system for deaf mutes |
| CN104703091A (en) * | 2013-12-06 | 2015-06-10 | 上海果壳电子有限公司 | Wearable equipment provided with noise elimination device |
| WO2015096440A1 (en) * | 2013-12-24 | 2015-07-02 | 中兴通讯股份有限公司 | Microphone apparatus and earphone |
| CN104780481A (en) * | 2015-03-31 | 2015-07-15 | 袁晶 | Microphone device and sound system |
| CN105577909A (en) * | 2015-05-26 | 2016-05-11 | 东莞酷派软件技术有限公司 | Denoising method and device |
| CN106373586A (en) * | 2015-07-24 | 2017-02-01 | 南宁富桂精密工业有限公司 | Noise filtering circuit |
| CN106373586B (en) * | 2015-07-24 | 2020-03-17 | 南宁富桂精密工业有限公司 | Noise filtering circuit |
| CN110352334A (en) * | 2017-08-31 | 2019-10-18 | 深圳市大疆创新科技有限公司 | Hit detection method, strike detection device and armoring trolley |
| CN109547883A (en) * | 2017-09-14 | 2019-03-29 | Ess技术有限公司 | Determine the circuit influence on the environment of electrical load device and method |
| CN109547883B (en) * | 2017-09-14 | 2021-01-22 | Ess技术有限公司 | Circuit and method for determining an environmental impact on an electrical load device |
| CN107764897A (en) * | 2017-10-17 | 2018-03-06 | 四川升拓检测技术股份有限公司 | Contactless continuous-moving type lossless detection method based on air acceleration |
| CN108886647A (en) * | 2018-04-04 | 2018-11-23 | 万魔声学科技有限公司 | Earphone noise-reduction method and device, main earphone, from earphone and earphone noise reduction system |
| CN111537851A (en) * | 2020-05-22 | 2020-08-14 | 刘莹雪 | Cable monitoring system based on Internet of things |
| CN111537851B (en) * | 2020-05-22 | 2020-12-08 | 国网江苏省电力有限公司苏州供电分公司 | Cable monitoring system based on Internet of things |
| CN114501236A (en) * | 2022-01-25 | 2022-05-13 | 中核安科锐(天津)医疗科技有限责任公司 | Noise reduction pickup apparatus and noise reduction pickup method |
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Open date: 20080213 |