CN2319965Y - Dynamic noise reducing language processor - Google Patents
Dynamic noise reducing language processor Download PDFInfo
- Publication number
- CN2319965Y CN2319965Y CN 97202235 CN97202235U CN2319965Y CN 2319965 Y CN2319965 Y CN 2319965Y CN 97202235 CN97202235 CN 97202235 CN 97202235 U CN97202235 U CN 97202235U CN 2319965 Y CN2319965 Y CN 2319965Y
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- CN
- China
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- output
- phase
- resistance
- amplifier
- oppisite phase
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Abstract
The utility model relates to a dynamic noise reducing language processor, which is suitable for the work in the environment of strong noise. The utility model is used for recognizing and processing the input signals, the speech signals can be separated from the noise, the speech signals can be amplified, and the background noise can be repressed. The utility model mainly comprises a speech following circuit and a background noise automatic monitoring circuit, the speech following circuit can be used for amplifying the speech signals, and the background noise automatic monitoring circuit can be used for separating the speech signals from the background noise.
Description
The utility model relates to a kind of DNR dynamic noise reduction language processor, is applicable to the work under the high-noise environment.This product belongs to communication and application of electronic technology field.
At aerospace field, as aircraft, aircraft INCOM intercom device, radio station, telephone, voice is not easy to identify in noise circumstance, influences communication effect; In addition, in many places, people adopt the computer language recognition system, promptly directly control machine works with language.People send different speech signals, and machine just can be carried out different operations, but after ambient noise was greater than 65db, then the machine error rate sharply increased, even can not correctly work.
The purpose of this utility model is to provide a kind of input signal is discerned and handled, and speech signal is separated from noise, and amplified the DNR dynamic noise reduction language processor of speech signal, inhibition background noise.
The utility model mainly is made up of two parts: the automatic supervisory circuit of voice follow circuit and background noise.When input had speech signal to occur, the automatic supervisory circuit of background noise detected speech signal, and the voice follow circuit amplifies speech; When speech signal stops, the automatic supervisory circuit of background noise does not detect speech signal, and the voice follow circuit is in attenuation state to noise, and suppresses its output.Promptly in high-noise environment, noise can not enter circuit by transmitter, and speech signal can be exaggerated, thereby reaches the purpose of eliminating noise.
The utility model comprises by A
5, A
6, A
7Three high cmrr pre-amplification circuits that operational amplifier is formed; By A
4, D
1, D
2With proportional amplifier A
2, programmable amplifier LM146, voltage follower A
8The voice follow circuit of forming and by A
2, A
3, C
A, R
A, B
1Form the background noise watch-dog Deng device.Its circuit connecting relation is:
Operational amplifier A
5, A
6In-phase end accept input signal, A
5, A
6End of oppisite phase by series resistance R
1Link to each other feedback resistance R
2Be connected in parallel on A
6Output and A
6Between the end of oppisite phase, feedback resistance R
3Be connected in parallel on A
5Output and A
5Between the end of oppisite phase, A
5The resistance R of output by being in series with it
4With operational amplifier A
7End of oppisite phase link to each other resistance R
5Be connected in parallel on operational amplifier A
7Output and end of oppisite phase between, A
6The resistance R of output by being in series with it
6With operational amplifier A
7In-phase end link to each other resistance R
7Be connected in parallel on operational amplifier A
7In-phase end and ground between; A
7Output one tunnel be serially connected with coupling capacitance C
1Insert the in-phase end of programmable amplifier LM146, R
8, C
4Be connected between LM146 select lines and the ground R
9Be serially connected in LM146 select lines and A
3Output between, LM146 output termination A
8In-phase end, A
8Output termination output coupling capacitor C
2, C
2Another termination R
10, R
11The resistors match network of forming can directly connect with other communication apparatus; A
7Another road of output through coupling capacitance C
3With D.C. resistance R
12A is received in series connection
4In-phase end, A
4, D
1, D
2Form logarithmic amplifier, logarithmic amplifier A
4Output through diode D
3Receive proportioner A
2In-phase end, C
B, R
BBe connected on A
2Between in-phase end and the ground, D
3, R
B, C
BForm half-wave rectifying circuit, R
13, R
14, C
5Form the series resistance bleeder circuit, R
13, R
14Be connected between supply voltage and the ground R
13, R
14Contact provide the quiescent operation current potential for amplifier.C
5And R
14Parallel connection plays pressure stabilization function, A
2End of oppisite phase and A
3End of oppisite phase connect A
3Output be connected with the LM146 select lines; The background noise watch-dog is by A
2, A
3, C
A, R
A, B
1Form A Deng device
2In-phase end be connected the output of A1, A
2End of oppisite phase and A
3End of oppisite phase connect B
1Be connected on A
3In-phase end and A
2End of oppisite phase between.
The utility model, can amplify speech when input has speech signal to occur owing to adopt the voice follow circuit; When speech signal stops, noise signal is suppressed its output.And the automatic supervisory circuit of background noise can make a distinction (noise is more stable signal) to speech signal (being made up of a string sine wave) with background noise.
Below in conjunction with accompanying drawing the utility model is further specified;
Accompanying drawing 1 is the operation principle block diagram of the utility model DNR dynamic noise reduction language processor.
Accompanying drawing 2 is the circuit theory diagrams of the utility model DNR dynamic noise reduction language processor.
As seen from Figure 1, Figure 2, circuit connecting relation of the present utility model is:
The utility model comprises by A
5, A
6, A
7Three high cmrr pre-amplification circuits that operational amplifier is formed; By A
4, D
1, D
2With proportional amplifier A
2, programmable amplifier LM146, voltage follower A
8The voice follow circuit of forming and by A
2, A
3, C
A, R
A, B
1Form the background noise watch-dog Deng device;
Operational amplifier A
5, A
6In-phase end accept input signal, A
5, A
6End of oppisite phase by series resistance R
1Link to each other feedback resistance R
2Be connected in parallel on A
6Output and A
6Between the end of oppisite phase, feedback resistance R
3Be connected in parallel on A
5Output and A
5Between the end of oppisite phase, A
5The resistance R of output by being in series with it
4With operational amplifier A
7End of oppisite phase link to each other resistance R
5Be connected in parallel on operational amplifier A
7Output and end of oppisite phase between, A
6The resistance R of output by being in series with it
6With operational amplifier A
7In-phase end link to each other resistance R
7Be connected in parallel on operational amplifier A
7In-phase end and ground between; A
7Output one tunnel be serially connected with coupling capacitance C
1Insert the in-phase end of programmable amplifier LM146, R
8, C
4Be connected between LM146 select lines and the ground R
9Be serially connected in LM146 select lines and A
3Output between, LM146 output termination A
8In-phase end, A
8Output termination output coupling capacitor C
2, C
2Another termination R
10, R
11The resistors match network of forming can directly connect with other communication apparatus; A
7Another road of output through coupling capacitance C
3With D.C. resistance R
12A is received in series connection
4In-phase end, A
4, D
1, D
2Form logarithmic amplifier, logarithmic amplifier A
4Output through diode D
3Receive proportioner A
2In-phase end, C
B, R
BBe connected on A
2Between in-phase end and the ground, D
3, R
B, C
BForm half-wave rectifying circuit, R
13, R
14, C
5Form the series resistance bleeder circuit, R
13, R
14Be connected between supply voltage and the ground R
13, R
14Contact provide the quiescent operation current potential for amplifier.C
5And R
14Parallel connection plays pressure stabilization function, A
2End of oppisite phase and A
3End of oppisite phase connect A
3Output be connected with the LM146 select lines; The background noise watch-dog is by A
2, A
3, C
A, R
A, B
1Form A Deng device
2In-phase end be connected A
1Output, A
2End of oppisite phase and A
3End of oppisite phase connect B
1Be connected on A
3In-phase end and A
2End of oppisite phase between.
Operation principle of the present utility model is: input signal is from A
5, A
6In-phase end input, R
1, R
2, R
3Be respectively A
5, A
6Feedback resistance, A
5, A
6The difference mode signal quilt of output is by A
7, R
4, R
5, R
6, R
7After the subtraction circuit of forming amplifies, by A
7Output output.AC signal is by A
7Output divide two-way transmission: the one tunnel through coupling capacitance C
1Import the in-phase end of programmable amplifier LM146 into, another road is through coupling capacitance C
3Through D.C. resistance R
12Import A into
4In-phase end.AC signal enters A
4Behind the in-phase end, quilt is by A
4, D
1, D
2Forming logarithmic amplifier handles.The sensitivity of this logarithmic amplifier is by R
12, C
3Value determine respectively; Logarithmic amplifier feedback element D
1, D
2Logarithmic gain curve can be provided, and this has just enlarged the incoming signal level scope; Because the relation of input, output is a logarithmic relationship, circuit has the effect of amplifying that promotes to the small-signal of input, and has compression for the large-signal of input.After AC signal was exported by logarithmic amplifier, process was by D
3, R
B, C
BForm half-wave rectifying circuit, AC signal is become direct current signal, this direct current signal is to capacitor C
BCarry out quick charge, the charging interval is controlled in the 1ms, depends on C discharge time
BAnd R
BValue.C
B, R
BValue is suitable, C
BOn level value can follow the variation of incoming signal level value.R
13, R
14, C
5Form the series resistance bleeder circuit, R
13, R
14Contact provide the quiescent operation current potential for amplifier.C
5And R
14Parallel connection plays pressure stabilization function.Signal is through amplifier A
1After the amplification, enter by A
2, A
3, C
A, R
A, B
1Deng the background noise watch-dog that device is formed, it can make a distinction (noise is more stable signal) to speech signal (being made up of a string sine wave) with background noise, and the voltage level of representing average background noise is stored in A
2The capacitor C of end of oppisite phase
AIn, C
AValue is bigger, R
AC
ATime constant big (4～5 seconds), A
2End of oppisite phase C
AOn voltage be sent to and send detection comparator A
3End of oppisite phase.R
8, R
9, C
4Form the V/I change-over circuit.With A
3The voltage variety of output becomes the Current Control amount.The operating state of programmable amplifier LM146 depends on comparator A
3State.Work as A
3Control signal (A is arranged
3Just saturated is the 5V direct voltage), LM146 is in running order; Work as A
3No control signal (A
3The negative saturated 0V that is output as), LM146 is in attenuation state.A
8Be voltage follower,, have language and follow the effect of amplifying with electric current as the output stage of language processor.A
8Output termination output coupling capacitor C
2, C
2Another termination R
10, R
11The resistors match network of forming can directly connect with other communication apparatus.
The course of work of the present utility model is: do not having under the situation of speech signal, because A
3In-phase end has been accepted the voltage level lower than end of oppisite phase (low approximately 40mv), so comparator A
3Be in negative saturation condition, be output as low level, programmable amplifier is in attenuation state.The noise signal that enters preamplifier can not be transmitted.When the speech signal level is delivered to input, through A
1Ratio is amplified back output, and the speech signal level is at A
2The voltage of reverse input end (is C
AOn voltage) change before, arrive and send detection comparator A
3In-phase input end, make A
3Become just saturated, comparator A
3Output becomes high level, produces the control voltage signal, and programmable amplifier is in magnifying state, the output language signal.When in short having said A
3The level of in-phase input end is lower than noise level storing value, A again immediately
3Become negative saturated, A
3Be output as low level, programmable amplifier is in attenuation state again.When background noise changed, the noise level storing value also changed thereupon, when not having the speech signal input, and A
3End of oppisite phase is always than the low 40mv of in-phase end, A
3Be in negative saturatedly, make programmable amplifier be in attenuation state.When even the background noise sound level is very big, circuit still can reliably working.
Experiment shows that people's ear is insensitive to the pulse interference signal less than 1ms.In instant response, the time of supposing the interference signal generation, the effect of people's ear is equivalent to an integrator can not hear this class interference noise less than 1ms.According to this characteristic, when design circuit, the fast element of selection work is to guarantee the operating rate of circuit.When speech signal is done the time spent, programmable circuit in the time, is converting magnifying state by attenuation state less than 1ms, and behind the effect blackout, in 60～200ms, programmable circuit converts attenuation state to by magnifying state.The state conversion process of the imperceptible programmable amplifier of people's ear.Language is easy to by circuit, and noise then can not pass through.This circuit is to noise level decay average out to 20db.
DNR dynamic noise reduction language processor the key technical indexes is as follows:
1. circuit gain is 30db, and frequency bandwidth is 300～3400HZ.
2. transmitter input impedance scope is 40～300 Ω, the moving-coil type transmitter.
3. operating supply voltage is 5V, and static working current is 5～7mv.
4. reliably working in the noise circumstance below 125db does not need any adjusting.
5. working temperature :-40 ℃～+ 85 ℃.
Claims (1)
1. DNR dynamic noise reduction language processor is characterized in that:
This processor comprises by A
5, A
6, A
7Three high cmrr pre-amplification circuits that operational amplifier is formed; By A
4, D
1, D
2With proportional amplifier A
2, programmable amplifier LM146, voltage follower A
8The voice follow circuit of forming and by A
2, A
3, C
A, R
A, B
1Form the background noise watch-dog Deng device; Its circuit connecting relation is:
Operational amplifier A
5, A
6In-phase end accept input signal, A
5, A
6End of oppisite phase by series resistance R
1Link to each other feedback resistance R
2Be connected in parallel on A
6Output and A
6Between the end of oppisite phase, feedback resistance R
3Be connected in parallel on A
5Output and A
5Between the end of oppisite phase, A
5The resistance R of output by being in series with it
4With operational amplifier A
7End of oppisite phase link to each other resistance R
5Be connected in parallel on operational amplifier A
7Output and end of oppisite phase between, A
6The resistance R of output by being in series with it
6With operational amplifier A
7In-phase end link to each other resistance R
7Be connected in parallel on operational amplifier A
7In-phase end and ground between;
A
7Output one tunnel be serially connected with coupling capacitance C
1Insert the in-phase end of programmable amplifier LM146, R
8, C
4Be connected between LM146 select lines and the ground R
9Be serially connected in LM146 select lines and A
3Output between, LM146 output termination A
8In-phase end, A
8Output termination output coupling capacitor C
2, C
2Another termination R
10R
11The resistors match network of forming can directly connect with other communication apparatus; A
7Another road of output through coupling capacitance C
3With D.C. resistance R
12A is received in series connection
4In-phase end, A
4, D
1, D
2Form logarithmic amplifier, logarithmic amplifier A
4Output through diode D
3Receive proportioner A
2In-phase end, C
B, R
BBe connected on A
2Between in-phase end and the ground, D
3, R
B, C
BForm half-wave rectifying circuit, R
13, R
14, C
5Form the series resistance bleeder circuit, R
13, R
14Be connected between supply voltage and the ground R
13, R
14Contact provide the quiescent operation current potential for amplifier.C
5And R
14Parallel connection plays pressure stabilization function, A
2End of oppisite phase and A
3End of oppisite phase connect A
3Output be connected with the LM146 select lines;
The background noise watch-dog is by A
2, A
3, C
A, R
A, B
1Form A Deng device
2In-phase end be connected A
1Output, A
2End of oppisite phase and A
3End of oppisite phase connect B
1Be connected on A
3In-phase end and A
2End of oppisite phase between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97202235 CN2319965Y (en) | 1997-03-05 | 1997-03-05 | Dynamic noise reducing language processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97202235 CN2319965Y (en) | 1997-03-05 | 1997-03-05 | Dynamic noise reducing language processor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2319965Y true CN2319965Y (en) | 1999-05-19 |
Family
ID=33923447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97202235 Expired - Fee Related CN2319965Y (en) | 1997-03-05 | 1997-03-05 | Dynamic noise reducing language processor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2319965Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110431434A (en) * | 2017-03-01 | 2019-11-08 | 索尔塔雷有限公司 | System and method for detecting target sound |
| CN113257263A (en) * | 2020-04-10 | 2021-08-13 | 徐忠义 | Voice environment noise self-adaptive suppression circuit |
-
1997
- 1997-03-05 CN CN 97202235 patent/CN2319965Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110431434A (en) * | 2017-03-01 | 2019-11-08 | 索尔塔雷有限公司 | System and method for detecting target sound |
| CN113257263A (en) * | 2020-04-10 | 2021-08-13 | 徐忠义 | Voice environment noise self-adaptive suppression circuit |
| CN113257263B (en) * | 2020-04-10 | 2024-03-12 | 徐忠义 | Self-adaptive suppression circuit for voice environment noise |
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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 |