CN1209889C - Phoneme background noise inhibitor - Google Patents
Phoneme background noise inhibitor Download PDFInfo
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- CN1209889C CN1209889C CN 03121988 CN03121988A CN1209889C CN 1209889 C CN1209889 C CN 1209889C CN 03121988 CN03121988 CN 03121988 CN 03121988 A CN03121988 A CN 03121988A CN 1209889 C CN1209889 C CN 1209889C
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- 230000000452 restraining effect Effects 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 7
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- 210000000629 knee joint Anatomy 0.000 claims 1
- 230000002441 reversible effect Effects 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
- 230000001960 triggered effect Effects 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 11
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Abstract
The present invention relates to a novel design of a speech background noise suppression device. In the design, two one-way microphones with the same nature are reversely arranged, and two audio signals which contain speech and environment noise are taken out by using two emission following magnifying circuits. Differential amplifying circuits with high common mode suppression degree are adopted as basic circuits to eliminate noise, and one of the differential amplifying circuits is arranged under speech control. Without speech, the two differential amplifying circuits eliminate noise in an inverse balance mode; with the speech, a result after differential amplification and superposition makes a speech signal-to-noise ratio reach above 50dB. Even under 84dB environment noise, the output speech signal-to-noise ratio of the circuits is not lower than 30dB in the worst frequency range.
Description
Technical field
The invention belongs to the voice traffic transmission field, particularly be suitable for being used for the occasion that voice signal is converted into high-fidelity telecommunication signal in the stronger environment of background noise.
Background technology
The communication level has become a modern sign, language message also becomes the main means that modern society exchanges, also become the scheme that high-quality precision and sophisticated technology is selected for use with voice-operated electronic equipment, so the transmission of high fidelity speech has become crucial science and technology field, particularly how the inevitable occasion of ambient noise suppresses noise, make voice messaging accurately become very urgent problem in the glitch-free side of being interviewed that reaches, except that the larynx microphone, other various anti-interference formula microphone is very undesirable above situation under the 70dB situation at ambient noise level.Do platform by the software administration of computer technology utilization complexity with microprocessor and various noises are classified, discern, handled form artificial intelligence ear technology for addressing this problem.Though respond well but technical sophistication, cost height, and be not suitable for the product for civilian use and common communications industry.The interference of effectively resisting background noise need with low cost and the outstanding effect product to adapt to the needs of domestic consumer.
The inventor once designed a kind of design (seeing the L97212892.1 patent documentation) of simple and easy anti-noise microphone for this reason, two unidirectional microphones that adopted in the document oppositely are provided with, differential amplifier circuit by low pass filter and high cmrr is formed noise cancellation apparatus, though certain effect is arranged, but circuit design is too simple, during noise jamming in suppressing the multiple reflection environment, effect is relatively poor.Because in the space of our life, the size and the voice of a lot of objects and building, the wavelength of ambient noise signal is suitable, so stack of direct wave and reflected wave, can change the same a kind of ripple intensity adjacent that calculates in theory at 2 in the space, with the single audio frequency is that ambient noise is carried out actual measurement, in two points measured the worst situation of intensity difference in voice band be-5dB (difference should be the smaller the better) at a distance of 10mm, measure with the interior single-frequency that intrinsic microphone is carried out analog voice at 30cm, the worst situation also for-5dB (difference is the bigger the better) if such situation, former design suppresses the noise ability will become very poor.
Summary of the invention
The purpose of this invention is to provide a kind ofly has the device of highly inhibited energy to noise, with adapt to transfer out under the interference environment noise of 80dB the voice signal to noise ratio greater than 30dB more than.
Key of the present invention is the de-noising circuit design.In differential amplifier, intend increasing floating ground, further improved the common-mode rejection ratio of differential amplifier, circuit such as the formation of ambient noise zero output, voice control impuls and filtering interfering when having increased controlled differential amplifier, voice signal identification, no voice signal, performance index, advance and practicality all spy are better than applying for a patent of past.
From the spectrum analysis of voice as can be known, the frequency band that energy intensity is the highest is 300-500HZ, and the intensity that is higher than the 500HZ frequency reduces gradually, begins intensity from 300HZ and descends with the slope of every octave 6dB.If in voice, remove the frequency below the 2KHZ, just can't understand the meaning of voice; And remove frequency more than the 2KHZ, but can not influence understanding to voice.From the angle of auditory masking, voice and interference noise occur simultaneously again, shelter mutually to form influence to people's auditory threshold.If remove to shelter the environmental interference noise, must be higher than noise signal 20dB at the output voice signal with voice.That is to say that the signal to noise ratio of output voice is greater than the 20dB ambient noise just can not cause being sick of of the sense of hearing.If there is not voice signal to shelter, it is just very clear that the noise of 40dB sounds, so we can the pulse of term sound control system come control circuit, and the zero noise output when realizing not having voice signal.
Analyze from frequency, low frequency is sheltered much larger than high frequency sheltering low frequency high frequency.That is to say, low-frequency noise to the interference of voice much larger than the interference of high-frequency noise to voice.Disturb emphasis should consider of the interference of low frequency noise so suppress voice noise to voice.In the process that suppresses noise, promptly be that the high-end frequency of voice signal causes damage, can not influence judgement and understanding to voice yet.
As previously mentioned, we adopt special structure, guarantee that the two-way voice signal minimal difference that bi-directional microphones is taken out is-8dB; The maximum difference of ambient noise is-5dB.Voice in the circuit, noise signal identification, poor according to the thresholding that these two kinds of signals are not less than 3dB, realize by two high-performance linear amplifiers and two Shi Misi triggers.Calculate for convenience, the distance of two microphones is pressed 10mm and is calculated.To the noise signal of sound source far away, this relative amplitude difference of 2 can be similar to following formula and calculate: S=1-cos360L/a wherein L is two relative distances between the microphone, and a is the wavelength of this frequency.Like this we can calculate in relative amplitude difference at a distance of 2 3.4KHZ of 10mm be 20%, the relative amplitude difference of 2KHZ is 6.7%, the relative amplitude difference of 1KHZ is 1.7%, the relative amplitude difference of 500HZ is 0.42%, the relative amplitude difference of 300KHZ is 0.15%.Differential amplifier is to Noise Suppression degree L=20logS (dB).Be that 3.4KHZ is 14dB, 3KHZ is 16.5dB, and 2KHZ is 23dB, and 1KHZ is 35dB, and 500HZ is 47.5ddB, and 300HZ is 56.5dB.This shows that the distance of two microphones can impact the high-end noise suppressed degree of speech frequency.The index such as intensity, definition, signal to noise ratio that fortunately influences voice signal is all determined by the frequency below the 2KHZ in the voice signal.So be higher than voice and interference noise more than the 3.4KHZ with low pass filter filters out, help improving the interference free performance of voice background noise.
Key of the present invention is the de-noising circuit designed according to above theory analysis, is two same sex omnidirectional microphone, instead be provided with back one dorsad and be used as voice and send words, another as the antiphase difference amplify de-noising with reference to microphone.And comprise in the noise cancellation apparatus structure that two are penetrated with amplifier, exchange circuit for and voice control signal circuits for triggering are formed by the background noise inhibitor of forming for the compound differential amplifier circuit of floating ground, low pass filter, voice signal control signal.Wherein two input signals of penetrating with amplifier come from the audio signal that two microphones that oppositely are provided with collect, divide two-way from penetrating the audio signal of drawing with amplifier, one pass is gone into the background noise inhibitor of the controlled differential amplifier circuit composition of differential amplifier circuit of compound band floating ground, another pass is gone into the voice control signal and is extracted circuit, the voice control impuls of exporting is delivered to circuits for triggering through anti-jamming circuit, send the amplifier that control signal sends in the compound differential amplifier circuit by circuits for triggering and consist of controlled differential amplifier circuit, the realization noise is offset fully when no voice output, make controlled differential amplifier circuit change differential amplifier circuit under the unbalance attitude into when only voice being arranged, to improve the voice signal to noise ratio.
Calculate background noise at 84dB by the circuit of above principle design, low coverage with normal intensity to microphone talk (about 30dB) voice signal to noise ratio in voice band several typical frequency band.The poorest signal to noise ratio in voice output between the 300HZ-3.4KHZ also has more than the 30dB.
Schematic diagram further specifies and the objective of the invention is to realize as protecting among the embodiment that provides below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is an amplifier circuit for sound frequency signal
Fig. 3 is differential amplifier circuit, superposition circuit and the anti-jamming circuit of compound band floating ground
Fig. 4 voice control signal is extracted circuit theory diagrams
Fig. 5 low pass filter electrical schematic diagram, Fig. 6 are flip-flop circuit.
Wherein 1 represent the audio frequency sensing circuit, the microphone that 1A, 1B represent two lists, the same sexes and oppositely coordinate, 2,3 representatives are penetrated with amplifier, the background noise inhibitor that the differential amplifier circuit of the compound band floating ground of 4 representatives is formed.4A, 4B represent two band floating ground differential amplifier circuits, 4C represents anti-phase audio signal adder, 4D represents electronic switch, 5 represent low pass filter, on behalf of the voice control signal, 6 extract circuit, 6A, 6B are that the identical audio signal of two-way is changeed the pulse signal change-over circuit, 6AA and 6BA are the audio analog signals linear amplifier, 6AB and 6BB are that analog signal is changeed pulse signal circuit, and 6C extracts circuit for the voice pulse signal, and 6D is an anti-jamming circuit, 7 is voice pulse signal trigger, R is the resistance sign, and C is the electric capacity sign, U
1～U
4Be the four high guaily unit sign, U
5Be trigger, U
6Represent XOR gate, U
7Represent electronic switch, U
8Be the Cd4098 integrated package, D represents diode.
Embodiment
The differential amplifier circuit (4A, 4B) that in the physical circuit that background noise inhibitor 4 of the present invention is taked is the high common mode inhibition degree of the identical band floating ground of two performances is formed, one of them differential amplifier 4A is a convertible differential amplifier that is subjected to voice signal control (triggering of voice pulse signal) of particular design, it controls 4A by having or not of voice, be converted to differential amplifier by unbalanced differential amplifier, the audio signal (voice and noise) that these two basic identical circuit are exported is at set adder 4C, i.e. a variable resistance W
1On converge addition, by variable resistor W
1Travelling arm on take out voice signal after the addition by filter circuit 5 outputs.Such difference channel.Such design can not reach quiet boundary from the noise level of cancelling out each other basically when having voice to import into.And when the forte signal is arranged, can be from variable resistor W
1On take out voice signal clearly, background noise is eliminated basically fully, sound resembling not being under the noise circumstance that this is one of evident characteristic of forming of the present invention just.The key of step design is exactly how to finish automatic switchover to de-noising circuit with the proposition voice signal so down.
Control to controlled differential amplifier circuit 4A is to have added electronic commutator 4D, utilizes two short circuit wiring on the electronic commutator, is connected the balance resistance R of differential amplifier circuit
26Two ends, R when electronic switch 4D conducting
26Short circuit differential amplifier circuit 4A becomes common amplifying circuit, and voice signal is effectively amplified, and shelters background noise with the high-gain of voice, obtains the excellent communications effect, and when electronic switch 4D open circuit, can not finely tune W when promptly having phonetic entry
1Thereby, make the noise background basic neutralisation obtain desirable conversation environment and obtain acoustically " totally ".
Comprise in the extraction circuit 6 of voice control signal by the very consistent Audio Signal Processing passage of two-way.Promptly be pulse signal change-over circuit (6A, 6B).The signal of two-way output becomes pulse signal through circuits for triggering (6AB, 6BB).Above circuit and voice pulse signal extract the extraction that circuit 6C realizes the voice pulse.From two microphone (1A, penetrating 1B) with amplifier (2, the two-way audio analog signal of 3) drawing is imported the circuit (6A of two symmetric designs respectively, 6B), utilize trigger (6AB, 6BB) being easy to the two-way analog signal conversion is the two-way audio pulse signal, because in the two-way audio signal, voice amplitude difference minimum is 8dB, the noise magnitude difference is 5dB to the maximum, so the thresholding of trigger is made as 1.8V, power settings is 3.3V, be easy to an amplitude like this and be converted to dephased pulse signal less than the 5dB noise signal, and amplitude difference is converted to one road pulse signal greater than the voice signal of 8dB, this two paths of signals optimizes the voice pulse signal when being the main circuit of voice pulse extraction circuit 6C with the XOR gate.The pulse phase difference of introducing owing to the amplitude difference of noise, and the noise that is higher than speech frequency all can be filtered when next stage anti-jamming circuit 6D and decreases and remaining single voice pulse signal.Remaining single voice pulse signal can further be widened in subordinate's circuits for triggering 7, thereby guarantees the continuity of language in the voice.So just from audio frequency, taken out control differential amplifier circuit 4A voice pulse signal.
From Fig. 2～Fig. 5 given be embodiment of circuit, wherein as can be seen from Figure 1 the audio frequency of microphone (1A, 1B) to penetrate with amplifying circuit (2,3) be by two operational amplifier (U
1A, U
1B) and peripheral Resistor-Capacitor Unit: R1～R4, C
1～C
2Overlap joint forms.Export by penetrating after linearity is amplified by language and noise that microphone (1A, 1B) is gathered with amplifier.
Fig. 3 has provided the noise reducer circuit, the embodiment of low pass circuit.De-noising circuit is the compound differential amplifier circuit (4A, 4B) and the adder 4C of two essentially identical band floating grounds of common mode inhibition degree.Having provided this circuit among the figure is by two four high guaily unit integrated package (U
2, U
3) and peripheral Resistor-Capacitor Unit R
19～26Capacitor C～C
12Overlap joint is formed, and wherein 4A is a controlled differential amplifier circuit, and two short-circuit lines of electronic switch 4D are connected on balance resistance R
26Two ends, thereby form controlled convertible differential amplifier circuit 4A, the output of differential amplifier circuit (4A, 4B) of two band floating grounds is connected on adder 4C, i.e. a variable slide resistor W
1Two ends and since its phase place mutually on the contrary noise level can transfer to zero, the quiet effect when forming no voice.The trigger end of electronic switch 4D causes the output of trigger 7, in fact is subjected to the control of voice pulse.R when the voice pulse exists
26Short circuit, 4A is amplified to differential amplifier under the unbalance attitude by difference, changes the amplitude difference increasing that the back voice signal obtains to gain and makes the output voice signal by it; So producing the stronger system of having supported of noise background after superposition is pressed on adder 4C is that the voice signal to noise ratio reaches more than the 30dB, the inhibition of basic noise reaches the desirable index of theoretical demonstration.
What Fig. 4 provided is the electrical schematic diagram that the voice control signal is extracted circuit, comprising by will be by the voicefrequency circuit of two microphone collections and amplification, handle formation pulse signal change-over circuit (6A, 6B) by two paths, two circuit are just the same, comprise one by operational amplifier U
1C and peripheral component R
5～R
7Capacitor C
5The linear amplifier circuit of forming, the signal after the amplification is sent into the trigger gate circuit U
5ABe converted to pulse signal, the two-way audio signal promptly is converted to two pulse signals, and two pulse signals is sent into extracted circuit 6C, promptly be by XOR gate U
6AWhat the back was exported promptly is the voice pulse signals, and this signal is sent into anti-jamming circuit 6D.
This anti-jamming circuit 6D specifically is by the trigger gate circuit U
5C-U
5DAnd by diode D
1Resistance R
27 Electric capacity 10 is formed high frequency filters, takes the buffer circuit that string forms, and makes voice pulse signal in the audio frequency smoothly by delivering to trigger 7.
What Fig. 5 provided is the electrical schematic diagram of low pass filter 5, and this low pass filter is by operational amplifier U
4A and peripheral Resistor-Capacitor Unit C
8, C
9, C
10, R
25, R
29Overlap joint is formed, from W
1The audio signal of taking out on the travelling arm can filter noise signal more than the 3.4KH through resistance 28,29 input operational amplifiers.
The embodiment of Fig. 2 to Fig. 5 can form a complete voice background noise restraining device.
Because two-way voice signal and noise signal that microphone 1A, 1B obtain are passed through U respectively
1A, U
1What B constituted penetrates with carrying out impedance matching, makes microphone circuit be input to two differential amplifiers and two linear amplifiers simultaneously and is independent of each other each other.Operational amplifier U2, U3 use four inner separately separate units respectively, and peripheral components formed two differential amplifiers that have than the high cmrr performance respectively, and wherein the differential amplifier balance input resistance R26 that constitutes of U3 is subjected to the control of voice control impuls can make U3 carry out difference to the conversion between the common amplification.Because the input signal phase place of U2, U3 is opposite, so their output also is the signal that amplitude equates, phase place is opposite, when not having the voice control impuls, adder W1 not only can make the output of U2, U3 isolate mutually, and finely tunes centre tapped position and can eliminate the output that the amplification quantity difference of the U2, the U3 that cause owing to device parameters is discrete increases noise.When the voice control impuls is arranged, can be from W1 centre cap output voice signal.U
1C, U
1DAnd peripheral components constituted two linear amplifiers, the signal that takes out from the microphone group is carried out linear amplification after, again by trigger U
5A, U
5BChange control wave into.Because the amplitude difference of noise signal may reach 5dB, can introduce U
5A, U
5BThe phase difference of output pulse causes XOR gate U
6AOutput has a large amount of disturbing pulses; In addition, when noise frequency is higher than the voice highest frequency, also can introduce disturbing pulse.These serious interference have influenced the operate as normal of circuit, must use U
5C, U
5D, D
1, R
27In addition filtering of the anti-jamming circuit of forming, and obtain single voice control impuls.U
8A and peripheral components thereof have constituted stretch circuit, and be voice control impuls broadening, continuous, smooth with the voice that guarantee circuit output.U
4AAnd peripheral components formed low pass filter, and all signals that filtering 3.4KHZ is above can guarantee the definition of voice, can be because of this device to the noise suppressed degree step-down more than the 3.4KHZ, and the signal to noise ratio of output voice signal is degenerated.
Claims (10)
1, the voice background noise restraining device, comprise an omnidirectional microphone (1A) and another omnidirectional microphone (1B) that oppositely is provided with in the structure, and corresponding difference amplifying type de-noising circuit, it is characterized in that this device comprises that two are penetrated with amplifier (2,3), the background noise inhibitor (4) that has the controlled combined type differential amplifier circuit composition of floating ground, low pass filter (5), the voice control signal is extracted circuit (6), anti-jamming circuit (6D), voice-operated pulse signal trigger (7), wherein penetrate with amplifying circuit (2 for two, 3) input signal all comes from the microphone loop (1A that is followed, audio signal 1B), from penetrating with amplifier (2,3) Shu Chu signal is divided into two-way, one pass goes into to have the background noise inhibitor (4) that the differential amplifier circuit of the combined type of floating ground is formed, one pass is gone into the voice control signal and is extracted circuit (6), extracted the voice pulse signal of circuit (6) output isolates by anti-jamming circuit (6D) by voice signal, be added on the electronic switch (4D) among the controlled differential amplifier circuit 4A in the background noise inhibitor (4) by language pulse signal circuits for triggering (7), the voice signal after filter is made an uproar is drawn through low pass filter (5) output from background noise inhibitor (4).
2, according to the said voice background noise restraining device of claim 1, it is characterized in that background noise inhibitor (4) is made up of two combined type differential amplifiers (4A, 4B) that have floating ground of two common mode inhibition degree performance index unanimities, wherein differential amplifier (4A) is one and is subjected to the voice signal pulse-triggered can realize differential amplifier circuit balanced and the imbalance state conversion.The voice of two differential amplifier circuits (4A, 4B) output and noise signal are at variable resistor (W
1) compile synthetic back by variable resistor (W on the adder (4C) formed
1) in the middle of adjust on the arm and draw voice signal to low pass filter (5).
3,, it is characterized in that having the differential amplifier balance matched impedance resistance (R in the controlled differential amplifier circuit (4A) of floating ground according to the said voice background noise restraining device of claim 2
26) being connected with the short circuit of electronic commutator (4D) regulation and control line forms the reversible type differential amplifier circuit, wherein the trigger end of electronic switch (4D) links to each other with voice pulse signal trigger (7) output.
4, according to the said voice background noise restraining device of claim 1, it is characterized in that voice control signal extraction circuit (6) is by two pulse signals change-over circuit (6A, 6B) extracting circuit (6C) with the voice pulse signal forms, from penetrating with amplifier (2, the two-way audio signal of 3) drawing is imported two-way audio signal pulse change-over circuit (6A respectively, 6B) be converted into to converge behind the two-way audio pulse signal and enter voice pulse extraction circuit (6C), the voice pulse signal of therefrom drawing is again sent into anti-jamming circuit (6D) and be connected to voice pulse signal circuits for triggering (7) after being isolated denoising, sends the trigger end that control signal meets electronic switch (4D) by these circuits for triggering (7).
5, according to the said voice background noise restraining device of claim 1, penetrating of it is characterized in that microphone (1A) is connected with (1B) can be by two operational amplifier (U with amplifying circuit (2,3)
1A, U
2B) and peripheral Resistor-Capacitor Unit (R
1～R
4, C
1～C
2) the overlap joint composition.
6, according to claim 1 or 2 said voice background noise restraining devices, it is characterized in that having the background noise inhibitor (4) that the compound differential amplifier circuit of floating ground forms is by 4 amplifier integrated package (U
2A-U
2D) and peripheral Resistor-Capacitor Unit (R
8～R
15, C
3, C
7) and 4 amplifier integrated package (U
3A-U
3D) and peripheral Resistor-Capacitor Unit (R
19～R
26, C
11～C
12) form, wherein two short circuit control lines of electronic switch (4D) are connected on resistance (R
26) two ends form controlled differential amplifier circuit (4A), the output of two differential amplifier circuits (4A, 4B) be connected on adder (4C) can power transformation resistance (W
1Thereby) two ends on form de-noising circuit, the trigger end of electronic switch (4D) causes on voice signal pulse trigger (7) output of voice wire size control, variable resistor (W
1) free knee-joint low pass filter (5) on.
7,, it is characterized in that it is by operational amplifier (U that audio signal is converted to pulse signal circuit (6A or 6B) according to claim 1 or 4 said voice background noise restraining devices
1C) and trigger gate circuit (U
5A) and supporting Resistor-Capacitor Unit (R
5～R
7, C
5) take composition, audio signal penetrating with amplifying circuit (2) or (3) output behind the microphone (1A, 1B) introduced, by pulse signal pulse gate circuit (U
5A) export voice pulse extraction circuit (6C) to.
8, according to claim 1 or 4 said voice background noise restraining devices, the extraction circuit (6C) that it is characterized in that the voice pulse is a logic judging circuit of being made up of XOR gate, the two-way audio pulse signal by (6A) and (6B) exports the XOR gate input to, the voice pulse signal of selecting is transported to the pulse anti-jamming circuit, and anti-jamming circuit is by (U
5C～U
5F) trigger, diode (D1), resistance (R
27), electric capacity (C
10) high frequency filter that is barricaded as forms, and outputs signal to voice pulse signal circuits for triggering (7).
9,, it is characterized in that trigger (7) is to take integrated package Cd4098 and peripheral Resistor-Capacitor Unit (C according to the said voice background noise restraining device of claim 1
13, C
14, R
30) overlapping the monostable circuit that forms, the speech trigger pulse exports the input of integrated circuit block in anti-jamming circuit (6D), output termination electronic switch (U
7A) trigger end.
10,, it is characterized in that said low pass filter is by operational amplifier (U according to the said voice background noise restraining device of claim 1
4A) and peripheral Resistor-Capacitor Unit (R
27, R
28, C
8, C
9, C
4) overlap joint forms, the voice signal of input is drawn on the free arm of synthetic adjustable resistance (W1), and speech output signal is from amplifier (U
4A) output is through electric capacity (C
4) draw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03121988 CN1209889C (en) | 2003-04-21 | 2003-04-21 | Phoneme background noise inhibitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03121988 CN1209889C (en) | 2003-04-21 | 2003-04-21 | Phoneme background noise inhibitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1450739A CN1450739A (en) | 2003-10-22 |
| CN1209889C true CN1209889C (en) | 2005-07-06 |
Family
ID=28684408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03121988 Expired - Fee Related CN1209889C (en) | 2003-04-21 | 2003-04-21 | Phoneme background noise inhibitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1209889C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7133825B2 (en) * | 2003-11-28 | 2006-11-07 | Skyworks Solutions, Inc. | Computationally efficient background noise suppressor for speech coding and speech recognition |
| CN100407293C (en) * | 2004-12-30 | 2008-07-30 | 华为技术有限公司 | Method and device for voice processing of wireless terminal |
| CN101079261B (en) * | 2007-07-02 | 2012-06-13 | 徐忠义 | Voice extraction circuit for suppressing environment noise |
| CN101667426A (en) * | 2009-09-23 | 2010-03-10 | 中兴通讯股份有限公司 | Device and method for eliminating environmental noise |
| CN102044252B (en) * | 2010-09-23 | 2012-12-19 | 瑞声声学科技(深圳)有限公司 | Device and method for eliminating noise |
| JP5728215B2 (en) | 2010-12-13 | 2015-06-03 | キヤノン株式会社 | Audio processing apparatus and method, and imaging apparatus |
| US20130044901A1 (en) * | 2011-08-16 | 2013-02-21 | Fortemedia, Inc. | Microphone arrays and microphone array establishing methods |
| CN103079143A (en) * | 2012-12-20 | 2013-05-01 | 广州视睿电子科技有限公司 | sound pickup method and system |
| US10114064B2 (en) * | 2014-10-31 | 2018-10-30 | Panasonic Intellectual Property Management Co., Ltd. | Error detection device |
| CN109104672B (en) * | 2018-08-27 | 2020-11-24 | 上海咔滨船舶装备有限公司 | Sound noise reduction circuit and microphone |
| CN112751574A (en) * | 2019-10-31 | 2021-05-04 | 上海汽车集团股份有限公司 | Differential signal communication isolation circuit and system |
-
2003
- 2003-04-21 CN CN 03121988 patent/CN1209889C/en not_active Expired - Fee Related
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