CN2256610Y - Background noise silencer for voice receiving system - Google Patents
Background noise silencer for voice receiving system Download PDFInfo
- Publication number
- CN2256610Y CN2256610Y CN 96213415 CN96213415U CN2256610Y CN 2256610 Y CN2256610 Y CN 2256610Y CN 96213415 CN96213415 CN 96213415 CN 96213415 U CN96213415 U CN 96213415U CN 2256610 Y CN2256610 Y CN 2256610Y
- Authority
- CN
- China
- Prior art keywords
- background noise
- receiving system
- amplifier
- voice receiving
- transmitter
- 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.)
- Expired - Fee Related
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- Noise Elimination (AREA)
Abstract
The utility model relates to a background noise silencer for a voice receiving system, mainly composed of a main telephone transmitter M [1] and an auxiliary telephone transmitter M [2]. Simultaneously, the back parts of the M [1] and the M [2] are provided with a background noise signal processing passage which is composed of amplifiers A [1] and A [2], a subtracter A and a band pass filter BPF and an automotive interest increasing controlling circuit AGC which is composed of trap filters BEF [1] and BEF [2] and a subtracter A'. A main voice signal which is input by the M [1] and has a background noise signal is processed by the signal processing passage and controlled by the AGC circuit to filter the background noise. Thereby, the clear voice signal is obtained, and the quality of the voice receiving system is enhanced.
Description
The utility model relates to a kind of device that can effectively eliminate background noise in the voice receiving system, belongs to the inhibition and the restriction technologies of noise in the electric communication transmission field or interference.
The voice receiving system is by transmitter the sound wave of voice signal to be converted to the signal of telecommunication, amplify then, handle, the frequency response bandwidth of transmitter almost comprises whole news territory (20HZ-20KHZ) scope, and people's voiceband is generally 300HZ-3KHZ, when transmitter converts voice signal to the signal of telecommunication, inevitably main speech and background noise (sound that sound source produces around the voice reception environment) are converted into the signal of telecommunication simultaneously, in speech processing system, be exaggerated, transmission, cause relatively poor voice processing effect, existing background noise is handled the digital processing of the architecture advances and the receiving system that mainly contain transmitter, though improve the selecting frequency characteristic that transmitter acoustic construction and amplification circuit structure can improve voice band, the noise beyond the voice band played to a certain degree inhibitory action; But to the most of noise in the voice band difficulty suppressed, eliminate function though digital processing system has good background noise, its complex structure, cost is higher, is difficult to be used widely in transmission field.
The purpose of this utility model provides a kind of reasonable in design, can effectively eliminate the novel apparatus of background noise.
The utility model is a voice receiving system background noise cancellation element, mainly by main transmitter M
1With secondary transmitter M
2Etc. formation, lead transmission principle according to electricity, the input signal I of main transmitter is the stack of main speech signal and background sound signal, and the input signal II of secondary transmitter is the background noise input signal, with the signal subtraction of main transmitter and secondary transmitter, its output signal then is:
Output signal=input signal I-input signal II
=(main speech signal+ambient noise signal)-ambient noise signal
=main speech signal
Based on above principle, behind the major and minor transmitter both positive and negative polarity reverse parallel connection of two same characteristic features, after the positive harmonic wave stack of the ambient noise signal of the negative harmonic wave of the ambient noise signal of secondary transmitter output and the output of main transmitter, filtering ambient noise signal, only stay the main speech signal of main transmitter output.
Another technical scheme of the present utility model is to be provided with by amplifier A behind described major and minor transmitter
1, A
2, subtracter A, the ambient noise signal treatment channel that band pass filter BPF constitutes, and by trapper BEF
1And BEF
2, the automative interest increasing controlling circuit AGC of subtracter A ' formation.Major and minor transmitter M
1And M
2, input signal I and II respectively by amplifier A
1And A
2After the amplification, send into subtracter A, subtract each other after filter BPF obtains voice signal, and amplifier A
2Be subjected to automative interest increasing controlling circuit AGC effect, control A
2Gain, make amplifier A
2The same A of ambient noise signal amplitude of output
1In the background noise amplitude equate, thereby on amplifier A with A
2And A
1The signal subtraction of output, the background noise of realizing ideal is eliminated effect.In addition,, also the voice band of 300HZ-3KHZ can be divided into two sections of 300HZ-fHZ and fHZ-3KHZ, handle respectively for improving the definition of voice.
The utility model compared with prior art, structural design is simple and practical, adopt the transmitter and the rational electronic circuit of two performance unanimities, can distinguish main speech and background noise effectively, and eliminate background noise, improve the quality of voice receiving system, the utility model can be widely used in wire communication (as telephone set), wireless telecommunications (as mobile telephone), recording studio, phonetic teaching equipment, voice such as outdoor environment receive the various occasions of handling.
Accompanying drawing has provided structural representation of the present utility model.
Fig. 1 is a basic structure schematic diagram of the present utility model;
Fig. 2 contains the structural representation of signal processing channel and automative interest increasing controlling circuit AGC for the utility model;
Fig. 3 contains the structural representation of high band and low-frequency range noise control loop for the utility model.
Below in conjunction with embodiment the utility model is further described.
Voice band with 300HZ-3KHZ on the basis of the described structure of Fig. 2 becomes two sections at arbitrary f frequency (300HZ ∠ f ∠ 3KHZ) apportion, and is provided with by amplifier A
3, A
4, A
7, A
9, A
10, the low-frequency range noise control loop that low pass trapper LPF/3KHZ, HPF/fHZ constitute and by amplifier A
5, A
6, A
8, A
11, A
12, high pass trapper HPF/300HZ, the high band noise control loop that LPF/fHZ constitutes is handled the background noise of low-frequency range and high channel respectively, then by amplifier A
13And A
14Input summer A
15Addition is after band pass filter BFE further eliminates the outer ambient noise of voice band, and voice signal is exported by output OUF.Simultaneously, in high and low frequency range noise control loop, adopt identical circuit structure and device, make two loop amplitude-frequencies, phase-frequency characteristic unanimity, want desirable background noise treatment effect to obtain.
Claims (4)
1, a kind of voice receiving system background noise cancellation element comprises main transmitter M
1, it is characterized in that also comprising secondary transmitter M
2, secondary transmitter M
2With main transmitter M
1By both positive and negative polarity oppositely and connect.
2, by the described voice receiving system of claim 1 background noise cancellation element, it is characterized in that also including by amplifier A
1And A
2, subtracter A, the ambient noise signal treatment channel that band pass filter BPF constitutes, A
1And A
2Link to each other with secondary transmitter with main transmitter respectively.
3, connect the described voice receiving system of claim 2 background noise cancellation element, it is characterized in that at amplifier A
1And A
2Between also be provided with by frequency band trapper BEF
1And BEF
2, the automative interest increasing controlling circuit AGC of subtracter A ' formation.
4, by claim 1 or 2,3 described voice receiving system background noise cancellation elements, it is characterized in that described amplifier A
1And A
2Between also be provided with by amplifier A
3, A
4, A
7, A
9, A
10, the low-frequency range noise control loop that low pass trapper LPF/3KHZ, HPF/fHZ constitute and by amplifier A
5, A
6, A
8, A
11, A
12, high pass trapper HPF/300HZ, the high band noise control loop that LPF/fHZ constitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96213415 CN2256610Y (en) | 1996-05-31 | 1996-05-31 | Background noise silencer for voice receiving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96213415 CN2256610Y (en) | 1996-05-31 | 1996-05-31 | Background noise silencer for voice receiving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2256610Y true CN2256610Y (en) | 1997-06-18 |
Family
ID=33895762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96213415 Expired - Fee Related CN2256610Y (en) | 1996-05-31 | 1996-05-31 | Background noise silencer for voice receiving system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2256610Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006017993A1 (en) * | 2004-08-18 | 2006-02-23 | Huawei Technologies Co., Ltd. | A background noise eliminate device and method for speech communication terminal |
| CN100370515C (en) * | 2001-10-03 | 2008-02-20 | 皇家飞利浦电子股份有限公司 | Method for canceling unwanted loudspeaker signals |
| CN101079261B (en) * | 2007-07-02 | 2012-06-13 | 徐忠义 | Voice extraction circuit for suppressing environment noise |
| CN111131947A (en) * | 2019-12-05 | 2020-05-08 | 北京小鸟听听科技有限公司 | Earphone signal processing method and system and earphone |
-
1996
- 1996-05-31 CN CN 96213415 patent/CN2256610Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370515C (en) * | 2001-10-03 | 2008-02-20 | 皇家飞利浦电子股份有限公司 | Method for canceling unwanted loudspeaker signals |
| WO2006017993A1 (en) * | 2004-08-18 | 2006-02-23 | Huawei Technologies Co., Ltd. | A background noise eliminate device and method for speech communication terminal |
| CN100337270C (en) * | 2004-08-18 | 2007-09-12 | 华为技术有限公司 | Device and method for eliminating voice communication terminal background noise |
| CN101079261B (en) * | 2007-07-02 | 2012-06-13 | 徐忠义 | Voice extraction circuit for suppressing environment noise |
| CN111131947A (en) * | 2019-12-05 | 2020-05-08 | 北京小鸟听听科技有限公司 | Earphone signal processing method and system and earphone |
| US11245976B2 (en) | 2019-12-05 | 2022-02-08 | Beijing Xiaoniao Tingting Technology Co., LTD. | Earphone signal processing method and system, and earphone |
| CN111131947B (en) * | 2019-12-05 | 2022-08-09 | 小鸟创新(北京)科技有限公司 | Earphone signal processing method and system and earphone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |