CN206533346U - A kind of gain control - Google Patents
A kind of gain control Download PDFInfo
- Publication number
- CN206533346U CN206533346U CN201720089895.XU CN201720089895U CN206533346U CN 206533346 U CN206533346 U CN 206533346U CN 201720089895 U CN201720089895 U CN 201720089895U CN 206533346 U CN206533346 U CN 206533346U
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- Prior art keywords
- circuit
- gain
- detection circuit
- gain control
- control circuit
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Abstract
The utility model provides a kind of gain control, amplitude detection circuit and gain control circuit are pushed up including forward gain amplifier, voltage control circuit, modulation circuit, amplitude detection circuit, zero cross detection circuit, anti-cut, the forward gain amplifier, voltage control circuit and modulation circuit are sequentially connected, the voltage control circuit connects the gain control circuit by the amplitude detection circuit and zero cross detection circuit respectively, and the modulation circuit connects the gain control circuit by the anti-top amplitude detection circuit of cutting.The gain control that the utility model is provided can keep good sound quality, while loudspeaker can be protected effectively, it is to avoid loudspeaker exceedes peak power and damaged.
Description
Technical field
The utility model is related to electronic circuit technology field, more particularly to a kind of gain control.
Background technology
Audio-frequency amplifier is that audio signal is carried out into power amplification, and the purpose that amplifies is reached with drive the speaker.At audio
During reason, in order to lift the effect of music, increase the loudness of music, it usually needs the audio signal to input is entered
Row automatic growth control, come the signal amplitude of the audio signal that adjusts input, decay significantly value signal amplifies small size value signal,
Ensure the steady of signal amplitude.Current audio-frequency power amplifier carries automatic growth control (AGC) function mostly.AGC is to make
The autocontrol method adjusted Gain Automaticly with signal intensity of amplifying circuit, the effect of AGC automatic gain control circuits
Be input signal amplitude change very greatly in the case of, it is automatic keep that amplitude output signal changes in the range of very little it is a kind of certainly
Dynamic control circuit.
Gain control method of the prior art, can be more than predetermined power-threshold in the power output for detecting amplifier
During value, power output is maintained to the power threshold of setting.But existing gain control method is easily made when controlling gain
Into distortion, audio result of broadcast is influenceed；Simultaneously when the output signal for detecting amplifier is more than predetermined predetermined threshold value, although
Can reduce output signal automatically, but during signal value output already exceed the maximum power value of loudspeaker, easily cause and raise
Sound device is damaged.
Publication No. CN104485909A patent document provides a kind of gain control method and device, and it uses multigroup
AGC control circuits judge the output of amplifier, the gain for doing different time for different output size is controlled, Ke Yiti
The result of broadcast of sharp music file, lifts the experience of user.But when output is more than the first predetermined threshold value (maximum of such as loudspeaker
Power) when, although gain meeting rapid decrease, signal output still alreadys exceed the maximum power value of loudspeaker, or meeting
Make speaker damage.Simultaneously as it is to export to judge from integrator that D audio frequency amplifier, which judges whether output cuts top, and judge
Different output power is the output judgement from first order variable gain amplifier, and the position that two kinds of mechanism judge is differed, therefore
It is unsuitable to apply in D audio frequency amplifier.
Publication No. CN104767498A patent document provides a kind of gain control method and device, and it uses zero passage
Detection, it is to avoid the gain to amplifier at the peak value of output signal is adjusted, so as to improve music effect.But work as
When having multigroup AGC controls circuit, it is impossible to choose whether to need zero passage detection to change gain.It is defeated if any a low frequency musical signal
It is fashionable, when output signal exceedes the limitation of loudspeaker peak power, it is necessary to quickly reduce gain, if it is necessary to waited until
It could change gain after zero detection, be likely to result in loudspeaker and be damaged.Make in addition, the second detection circuit of zero cross detection circuit has
It is not just to send out zero passage detection in minimum point to believe that output signal, i.e. output signal are judged with high threshold and lower threshold level
Number, so certain noise still can be caused when changing gain, influence result of broadcast.
Utility model content
For problem above, the utility model patent purpose is to devise a kind of gain control, can keep good
Good sound quality, while loudspeaker can be protected effectively, it is to avoid loudspeaker exceedes peak power and damaged.
The specific technical scheme of the utility model is as follows：
A kind of gain control, including forward gain amplifier, voltage control circuit, modulation circuit, amplitude detection electricity
Road, zero cross detection circuit, anti-cut push up amplitude detection circuit and gain control circuit, the forward gain amplifier, voltage control
Circuit and modulation circuit are sequentially connected, and the voltage control circuit passes through the amplitude detection circuit and zero cross detection circuit respectively
The gain control circuit is connected, the modulation circuit connects the gain control electricity by the anti-top amplitude detection circuit of cutting
Road；Wherein,
The voltage control circuit is used for the output signal for detecting and controlling the forward gain amplifier；
The amplitude detection circuit is used to receive the output signal of the voltage control circuit and compared with predetermined threshold value
Compared with the corresponding gain signal of output；
The zero cross detection circuit be used to judging the voltage control circuit output signal whether zero crossing, and in zero passage
During point corresponding gain signal is exported to the gain control circuit；
The anti-top amplitude detection circuit of cutting is used to detecting whether the output signal of the modulation circuit to occur cutting top, and
Appearance exports corresponding gain signal when cutting top to the gain control circuit；
The gain control circuit is used for according to the amplitude detection circuit, zero cross detection circuit and prevents cutting top amplitude detection
The gain signal of circuit output judges whether to need to carry out gain control, and when needing to carry out gain control to the prime
The gain of gain amplifier is controlled.
Specifically, gain control described in the utility model is applied to D audio frequency amplifier.
Specifically, amplitude detection circuit described in the utility model includes N number of amplitude detection circuit, N >=1.
Specifically, gain control circuit described in the utility model further comprises：Receive respectively the amplitude detection circuit,
Zero cross detection circuit and anti-cut push up the gain signal that amplitude detection circuit is exported, and judge whether to need zero crossing to be to carry out gain
Control.
Specifically, voltage control circuit described in the utility model includes：First comparator, the first controlling switch, the second ratio
Compared with device and the second controlling switch；
The input of the first comparator connects the output signal and the first reference voltage of forward gain amplifier respectively,
The output end of first comparator connects the first controlling switch；
The input of second comparator connects the output signal and the second reference voltage of forward gain amplifier respectively,
The output end of second comparator connects the second controlling switch.
Specifically, zero cross detection circuit described in the utility model includes：3rd comparator, the first delay circuit, second prolong
Slow circuit and XOR gate, the input of the 3rd comparator connect the output signal of the voltage control circuit, the 3rd respectively
The output end of comparator connects the first delay circuit by NOT gate all the way, and another road is directly connected to the second delay circuit, and described the
The output end of one delay circuit and the second delay circuit connects two inputs of the XOR gate respectively.
The gain control that the utility model is provided has advantages below compared with prior art：
(1) loudspeaker can be effectively protected by voltage control circuit, it is to avoid loudspeaker exceedes peak power and damaged；
(2) the multigroup AGC gain control function proposed, top detection is cut with reference to zero passage detection with anti-, judgement that can be complete
Output signal, to determine whether gain, how this changes, and effectively loudspeaker can be protected, and keeps simultaneously well
Sound quality；
(3) gain can be changed in minimum signal by zero cross detection circuit, it is to avoid miscellaneous during generation change in gain
Sound, can keep good sound quality.
Brief description of the drawings
The utility model embodiment is described further referring to the drawings, wherein：
Fig. 1 is circuit diagram of the present utility model；
Fig. 2 is the circuit diagram of the utility model embodiment one；
Fig. 3 is the utility model the utility model amplifier signal and gain relationship figure；
Fig. 4 is the circuit diagram of the utility model voltage control circuit；
Fig. 5 is the circuit diagram of the utility model amplitude detection circuit；
Fig. 6 is the input and output schematic diagram of the utility model amplitude detection circuit；
Fig. 7 is the circuit diagram of the utility model zero cross detection circuit；
Fig. 8 is the input and output schematic diagram of the utility model zero cross detection circuit.
Embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
The utility model proposes a kind of gain control, referring to Fig. 1, including forward gain amplifier, voltage control
Circuit processed, modulation circuit, amplitude detection circuit, zero cross detection circuit, anti-cut push up amplitude detection circuit and gain control circuit, institute
State forward gain amplifier, voltage control circuit and modulation circuit to be sequentially connected, the voltage control circuit is respectively by described
Amplitude detection circuit and zero cross detection circuit connect the gain control circuit, and the modulation circuit is prevented cutting top amplitude by described
Detect that circuit connects the gain control circuit.Wherein,
The voltage control circuit is used for the output signal for detecting and controlling the forward gain amplifier；
The amplitude detection circuit is used to receive the output signal of the voltage control circuit and compared with predetermined threshold value
Compared with the corresponding gain signal of output；
The zero cross detection circuit be used to judging the voltage control circuit output signal whether zero crossing, and in zero passage
During point corresponding gain signal is exported to the gain control circuit；
The anti-top amplitude detection circuit of cutting is used to detecting whether the output signal of the modulation circuit to occur cutting top, and
Appearance exports corresponding gain signal when cutting top to the gain control circuit；
The gain control circuit is used for according to the amplitude detection circuit, zero cross detection circuit and prevents cutting top amplitude detection
The gain signal of circuit output judges whether to need to carry out gain control, and when needing to carry out gain control to the prime
The gain of gain amplifier is controlled.
The gain control that the utility model is provided can effectively protect loudspeaker, it is to avoid loudspeaker is damaged.In the first order
Forward gain amplifier is exported, and adds voltage control circuit, peak power of the voltage control point set to load loudspeaker
PMAX., can be by voltage control circuit limitation in this maximum voltage when the output voltage of amplifier exceedes the peak power of loudspeaker
Point, does not allow voltage to exceed, while amplitude detection circuit can detect the output of voltage control circuit, and export the signal of drop gain to
Gain control circuit, quickly reduces gain.
Specifically, gain control circuit described in the utility model further comprises：Receive respectively the amplitude detection circuit,
Zero cross detection circuit and anti-cut push up the gain signal that amplitude detection circuit is exported, and judge whether to need zero crossing to be to carry out gain
Control.Zero passage detection of the present utility model judges it is to judge whether to need to drop in signal zero passage via gain control circuit
Gain.If output signal alreadys exceed PMAXOr voltage output signal is cut when pushing up distortion, zero passage letter is now withouted waiting for
Number, gain control circuit can be at once with most fast speed droop gain.When especially input is low frequency signal, if also waiting for zero passage
Gain could drop in signal, and loudspeaker can be under high-voltage case for a long time, be easily caused damage.And lost if top is cut in output
Very, it without rapid drop gain, can be damaged sound timbre.The utility model is by test point closer to zero point, it is to avoid signal compared with
High position changes gain, causes noise.
Specifically, gain control described in the utility model is applied to D audio frequency amplifier, modulation circuit uses D classes
Modulation circuit.Refer to the circuit diagram that Fig. 2 is the present embodiment one.
Amplitude detection circuit can have many groups, and the amplitude detection circuit includes N number of amplitude detection circuit, N >=1.Can
According to the power limited range of loudspeaker, carry out the speed of adjust gain decline, increase the dynamic range of sound.
Fig. 3 amplifier signals and gain relationship figure are referred to, the present embodiment is provided with third gear amplitude detection circuit, is respectively
Peak power PMAX, buffered power PMED, rated power PRMS.Power of loudspeaker may not exceed PMAX, otherwise can damage.Loudspeaker work(
Rate then can long-time operation in PRMSUnder, and between PMAXWith PRMSBetween just can be appropriate adjustment, allow sound to stop in a short time
This power bracket is stayed in, the dynamic range of sound can be so increased.This this, add PMEDPower judge, PMEDIt is approximately PRMS's
1.2 times, be PRMSBuffered power, many one group of power judge and time control, sound intensity can be made more rich.
Region A in Fig. 3 is referred to, when sound becomes big suddenly, more than PMAXWhen, voltage control circuit can limit output voltage
System does not allow loudspeaker to have the risk of damage, while gain control circuit controls gain rapid decrease is (such as in control voltage point
0.16ms/dB), signal is reduced to PMAXBelow.Or other situations, when When APS amplifier power supply voltages are relatively low, also drowned
To PMAXWhen, output just cuts top distortion, and now, gain control circuit also controls gain rapid decrease (such as 0.16ms/dB),
Make voice signal undistorted, it is to avoid the discordant sound of output.
Region B in Fig. 3 is referred to, when output is between PMAXWith PMEDWhen, gain meeting middling speed declines (such as 0.64ms/dB), permits
Perhaps of short duration big volume output.Region C in Fig. 3, when output is between PMEDWith PRMSWhen, control gain descending at slow speed (such as 21ms/
DB), the of short duration big volume is allowed to export.Region D in Fig. 3, when output is between PRMSWith PHYSWhen, gain can be maintained.In Fig. 3
Region E, F, G, when input signal diminishes, gain can be maintained first after 10ms, gain (such as 41ms/dB) is slowly being replied, until returning
Complex gain initial value, or export between PRMSWith PHYSShi Caihui is stopped.
Specifically, referring to the circuit diagram that Fig. 4 is voltage control circuit, voltage control circuit described in the present embodiment includes：
First comparator OP_H, the first controlling switch MP_H, the second comparator OP_L and the second controlling switch MP_L.Described first compares
The input of device connects the output signal and the first reference voltage of forward gain amplifier respectively, and the output end of first comparator connects
Connect the first controlling switch；The input of second comparator connects the output signal and the second ginseng of forward gain amplifier respectively
Voltage is examined, the output end of the second comparator connects the second controlling switch.
Voltage control circuit purpose is preventing power output more than the peak power P of loudspeakerMAXAnd make speaker damage.
Operation principle is through output signal VOP, VON for detecting forward gain amplifier and reference voltage Vref _ H, Vref_L pass
System, when VOP or VON is more than upper limit Vref_H or less than lower limit Vref_L, can be respectively started comparator OP_H or OP_L circuit
Carry out the signal that controlling switch the first controlling switch MP_H or the second controlling switch MP_L carrys out the output of limiting gain amplifier, reach limit
VOP and VON processed voltage.
Specifically, refer to Fig. 5 be amplitude detection circuit circuit diagram, by the output signal VOP of voltage control circuit,
VON respectively with VrefRMS、VrefHYSCompare, ATT can be obtainedRMSWith RLSRMSSignal, is then sent through gain control circuit and does and increase
Benefit control.
Refer to the input and output schematic diagram that Fig. 6 is amplitude detection circuit, ATTRMSDuring for high level, gain control circuit
Prepare drop gain, RLSRMSDuring for high level, gain control circuit prepares to rise gain.VrefRMSWith VrefHYSDifference have to
It is more than the gain range of decrease more than 1 bit, the problem of otherwise having gain bob.The purpose of delay circuit is to prevent
Circuit is disturbed and causes misoperation, and time delay can be several microseconds.The judgement of other different amplitudes can use identical width
Degree detects circuit framework to reach.
It is anti-to cut the similar amplitude detection circuit of top amplitude detection circuit, referring to Fig. 5, reference voltage is then the upper limit of triangular wave
Value.D class modulation Qi Li PWM generator is VOP1, the VON1 and triangle wave for exporting integrator and obtains PWM signals.
When output signal has the situation for cutting top to occur, i.e. when OUTP and OUTN duty reach 100% or 0%, the output of integrator
Whether signal (VOP1 and VON1) can exceed the amplitude range of triangular wave, so exceeding by decision integrator output on triangular wave
Limit value can detect whether amplifier output cuts top.When cutting top, amplifier can fast prompt drop gain, it is to avoid hear mistake
Genuine sound
Specifically, referring to the circuit diagram that Fig. 7 is zero cross detection circuit.The zero cross detection circuit includes：3rd compares
Device, the first delay circuit, the second delay circuit and XOR gate, the input of the 3rd comparator connect the voltage control respectively
The output signal of circuit processed, the output end of the 3rd comparator connects the first delay circuit by NOT gate all the way, and another road directly connects
Connect the second delay circuit, it is two defeated that the output end of first delay circuit and the second delay circuit connects the XOR gate respectively
Enter end.Using the 3rd comparator comparison voltage control circuit output signal VOP and VON signal, by delay circuit with it is different
After OR gate computing, a pulse wave signal is obtained, this pulse bandwidth is determined by delay circuit.
Refer to the input and output schematic diagram that Fig. 8 is zero cross detection circuit.When input signal stops suddenly, VOP and VON meetings
It can not hand over more, comparator can not produce change, now, whether pulse wave circuit for detecting can be detected in a period of time without pulse wave news
Number bring.When also being brought as alreadyd exceed 50ms apart from last pulse wave signal without next pulse wave, pulse wave detecting
Circuit can be forced out a pulse wave signal, allow gain control circuit smoothly to control gain.The pulse wave that this root is forced out is
Sent out in the case of no input signal, so gain changes meeting when signal is minimum, so now changing gain simultaneously
Noise will not be produced.
Specifically, sub-gain control circuit is not received pushes up amplitude detection circuit and zero point from amplitude detection circuit, anti-cut
The signal of circuit is detected, judges whether to need reduction gain or recovers gain, and with which kind of speed droop gain, if needed
Gain etc. is reduced when zero point, to control the gain of preamplifier.
Embodiment of the present utility model described above, does not constitute the restriction to the utility model protection domain.
Any various other corresponding changes and deformation made according to technical concept of the present utility model, should be included in this practicality
In new scope of the claims.
Claims (6)
1. a kind of gain control, it is characterised in that including forward gain amplifier, voltage control circuit, modulation circuit, width
Degree detection circuit, zero cross detection circuit, anti-cut push up amplitude detection circuit and gain control circuit, the forward gain amplifier,
Voltage control circuit and modulation circuit are sequentially connected, and the voltage control circuit passes through the amplitude detection circuit and zero passage respectively
Detect that circuit connects the gain control circuit, the modulation circuit connects described increase by the anti-top amplitude detection circuit of cutting
Benefit control circuit；Wherein,
The voltage control circuit is used for the output signal for detecting and controlling the forward gain amplifier；
The amplitude detection circuit is used to receive the output signal of the voltage control circuit and is compared with predetermined threshold value, defeated
Go out corresponding gain signal；
The zero cross detection circuit be used to judging the voltage control circuit output signal whether zero crossing, and in zero crossing
Corresponding gain signal is exported to the gain control circuit；
The anti-top amplitude detection circuit of cutting is used to detect whether the output signal of the modulation circuit occurs cutting top, and is occurring
When cutting top corresponding gain signal is exported to the gain control circuit；
The gain control circuit is used for according to the amplitude detection circuit, zero cross detection circuit and prevents cutting top amplitude detection circuit
The gain signal of output judges whether to need to carry out gain control, and when needing to carry out gain control to the forward gain
The gain of amplifier is controlled.
2. gain control according to claim 1, it is characterised in that the gain control is applied to D assonances
Audio amplifier.
3. gain control according to claim 1, it is characterised in that the amplitude detection circuit includes N number of amplitude
Detect circuit, N >=1.
4. gain control according to claim 1, it is characterised in that the gain control circuit further comprises：
The amplitude detection circuit, zero cross detection circuit and anti-cut are received respectively and pushes up the gain signal that amplitude detection circuit is exported, and are sentenced
It is disconnected whether to need to carry out gain control during zero crossing.
5. gain control according to claim 1, it is characterised in that the voltage control circuit includes：First ratio
Compared with device, the first controlling switch, the second comparator and the second controlling switch；
The input of the first comparator connects the output signal and the first reference voltage of forward gain amplifier, first respectively
The output end of comparator connects the first controlling switch；
The input of second comparator connects the output signal and the second reference voltage of forward gain amplifier, second respectively
The output end of comparator connects the second controlling switch.
6. gain control according to claim 1, it is characterised in that the zero cross detection circuit includes：3rd ratio
Compared with device, the first delay circuit, the second delay circuit and XOR gate, the input of the 3rd comparator connects the voltage respectively
The output signal of circuit is controlled, the output end of the 3rd comparator connects the first delay circuit by NOT gate all the way, and another road is direct
The second delay circuit is connected, the output end of first delay circuit and the second delay circuit connects the two of the XOR gate respectively
Input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720089895.XU CN206533346U (en) | 2017-01-20 | 2017-01-20 | A kind of gain control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720089895.XU CN206533346U (en) | 2017-01-20 | 2017-01-20 | A kind of gain control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206533346U true CN206533346U (en) | 2017-09-29 |
Family
ID=59917493
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720089895.XU Expired - Fee Related CN206533346U (en) | 2017-01-20 | 2017-01-20 | A kind of gain control |
Country Status (1)
| Country | Link |
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| CN (1) | CN206533346U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656085A (en) * | 2017-01-20 | 2017-05-10 | 深圳市中移联半导体科技有限公司 | Gain control device |
| CN109788402A (en) * | 2019-01-31 | 2019-05-21 | 维沃移动通信有限公司 | A kind of acoustic signal processing method and audio signal processor |
-
2017
- 2017-01-20 CN CN201720089895.XU patent/CN206533346U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656085A (en) * | 2017-01-20 | 2017-05-10 | 深圳市中移联半导体科技有限公司 | Gain control device |
| WO2018133565A1 (en) * | 2017-01-20 | 2018-07-26 | 深圳市中移联半导体科技有限公司 | Gain control device |
| CN109788402A (en) * | 2019-01-31 | 2019-05-21 | 维沃移动通信有限公司 | A kind of acoustic signal processing method and audio signal processor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190505 Address after: 518000 Guangdong Province, Futian District, Shenzhen, 1063 Xiangmei Road, Shuixie Flower Du Mingcuiju 2 20B Patentee after: Lin Qiliang Address before: 518000 No. 22 Huanping Road, Gaoqiao Community, Pingdi Street, Longgang District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN ZYL SEMICONDUCTOR TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170929 Termination date: 20220120 |
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| CF01 | Termination of patent right due to non-payment of annual fee |