CN105007050B - A kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value - Google Patents
A kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value Download PDFInfo
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- CN105007050B CN105007050B CN201510471603.4A CN201510471603A CN105007050B CN 105007050 B CN105007050 B CN 105007050B CN 201510471603 A CN201510471603 A CN 201510471603A CN 105007050 B CN105007050 B CN 105007050B
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Abstract
The present invention relates to a kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value, including amplitude attenuation circuit, absolute value circuit and threshold regulating circuit；The amplitude attenuation circuit, for receiving the feedback signal from threshold regulating circuit, so that the amplitude attenuation that amplitude exceedes the audio input signal of predetermined threshold value is extremely less than the predetermined threshold value；The absolute value circuit, it is positive audio signal transmission to threshold regulating circuit for obtaining the audio output signal of amplitude attenuation circuit to obtain amplitude as positive audio signal, and by the amplitude；The threshold regulating circuit, for when determine the amplitude be positive audio signal amplitude exceed predetermined threshold value when, then to feedback signal described in the amplitude attenuation circuit output.The present invention can avoid the audio signal of higher magnitude from inputting the damage or so that the generation of various distorted signals phenomenons caused to audio multiplying arrangement.
Description
Technical field
The present invention relates to electronic device field, more particularly to a kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value.
Background technology
Into after 21 century, a kind of important development that various portable electronic equipments become electronic equipment becomes
Gesture, it includes the mobile phone and the notebook computer that is convenient for carrying as means of communication, or even also includes as amusement equipment
MP3 player etc..These portable electronic equipments all possess a common ground, that is, have audio output, i.e., each electricity
Sub- equipment has been required to an audio-frequency amplifier.Efficient audio-frequency amplifier is more than needing in portable equipment,
It is also required in powerful electronic equipment.And the improvement of the living conditions with people, high-fidelity audio equipment and more high-grade
Home theater also gradually starts to rise.In such devices, tens watts even audio power of several hectowatts are generally required.At this moment,
Low distortion, efficient audio-frequency amplifier just turn into critical component therein.
But in the application of audio-frequency amplifier, it will usually run into input signal for some special shapes such as non-standard signals
State, when the amplitude of audio input signal is much larger than specified input voltage, the power output of audio-frequency amplifier can be caused to exceed and set
Fixed peak power output, it can not only be caused to damage to audio-frequency amplifier, it is also possible to cause the hair of various distorted signals phenomenons
Raw, serious may give remaining equipment for be connected with audio-frequency amplifier irreversible failure occur.
At present, although it is proposed that the method for some solution relevant issues, such as the input increase in audio-frequency amplifier
Automatic volume control circuit, with the audio amplitude adjust automatically gain of input, but automatic volume control circuit is complex, into
This is higher, and response speed is slower.
The content of the invention
In view of the shortcomings of the prior art, the purpose of the present invention is intended to provide a kind of audio signal for avoiding higher magnitude
Input cause damage to audio multiplying arrangement or cause the adjustable audio signal of threshold value that various distorted signals phenomenons occur from
Dynamic amplitude limiter.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value, including amplitude attenuation circuit, absolute value circuit and threshold
Value regulation circuit；
The amplitude attenuation circuit, for receiving the feedback signal from threshold regulating circuit, preset so that amplitude exceedes
The amplitude attenuation of the audio input signal of threshold value is extremely less than or equal to the predetermined threshold value；
The absolute value circuit, for obtaining the audio output signal of amplitude attenuation circuit to obtain amplitude as positive audio
Signal, and by the amplitude be positive audio signal transmission to threshold regulating circuit；
The threshold regulating circuit, exceed predetermined threshold value for the amplitude that the amplitude is positive audio signal ought to be determined
When, then to feedback signal described in the amplitude attenuation circuit output.
Preferably, the amplitude attenuation circuit includes photo-coupler, resistance R1, resistance R2 and the first operational amplifier；
One end of the resistive element of the photo-coupler and resistance R1 one end are connected with the first signal input part, institute
The other end for stating resistance R1 is connected with the reverse input end of the first operational amplifier, the resistive element of the photo-coupler it is another
End is connected by resistance R2 with the positive input of the first operational amplifier, one end of the light-emitting component of the photo-coupler and threshold
The output end of value regulation circuit is connected, the other end ground connection of the light-emitting component of the photo-coupler, first operational amplifier
Output end be connected with the input of absolute value circuit；
Wherein, the output end of first operational amplifier is also the first signal output part, first signal input part
For inputting audio input signal, first signal output part is used to export audio output signal.
Preferably, the amplitude attenuation circuit also includes electric capacity C1, electric capacity C2, resistance R3 and resistance R4；The electric capacity
C1 one end is connected with the reverse input end of the first operational amplifier, the other end of the electric capacity C1 and the first operational amplifier
Output end is connected, and the resistance R3 is in parallel with electric capacity C1；One end of the electric capacity C2 and the positive input of the first operational amplifier
End is connected, the other end ground connection of the electric capacity C2, and the resistance R4 is in parallel with electric capacity C2.
It is further preferred that the model NE5532 of first operational amplifier.
It is further preferred that the model LCR0202 of the photo-coupler.
Preferably, the absolute value circuit include resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10,
Diode D1, diode D2, the second operational amplifier and the 3rd operational amplifier, one end and the threshold value of the resistance R5 are adjusted
The output end of circuit is connected, the positive input phase that the other end of the resistance R5 passes through resistance R6 and the second operational amplifier
Even, positive pole of the reverse input end and output end of second operational amplifier with diode D1 is connected, second fortune
The reverse input end for calculating amplifier is also connected by resistance R7 with the reverse input end of the 3rd operational amplifier, the 3rd computing
The positive input ground connection of amplifier, the reverse input end of the 3rd operational amplifier also pass through resistance R8's and diode D2
Positive pole is connected, and the output end of the 3rd operational amplifier is connected with diode D2 positive pole, the negative pole of the diode D1 with
And negative pole of the diode D2 negative pole with diode D3 is connected, the positive pole of the diode D3 passes through resistance R9 and first voltage
Input is connected, and the negative pole of the diode D1 and diode D2 negative pole pass through resistance R10 and second voltage input
It is connected, the positive pole of the diode D3 is also connected with the input of threshold regulating circuit.
Preferably, the model of second operational amplifier and the 3rd operational amplifier is NE5532.
It is further preferred that the threshold regulating circuit includes four-operational amplifier, resistance R11, resistance R12, resistance
R14, resistance R15, diode D4, voltage-stabiliser tube D5 and diode D6, the positive input of the four-operational amplifier with absolutely
The output end of value circuit is connected, the reverse input end of the four-operational amplifier by resistance R11 and diode D4 just
Extremely it is connected, the reverse input end of the four-operational amplifier is grounded by resistance R14, and the resistance R15 and resistance R14 is simultaneously
Connection, the output end of the four-operational amplifier are connected with diode D4 positive pole, the positive pole and voltage-stabiliser tube of the diode D4
D5 negative pole is connected, and the positive pole of the voltage-stabiliser tube D5 is connected by resistance R12 with diode D6 positive pole, the diode D6's
Negative pole is connected with the feedback signal reception end of amplitude attenuation circuit.
Preferably, the threshold regulating circuit also includes resistance R13, electric capacity C7 and electric capacity C8, the voltage-stabiliser tube D5's
Positive pole passes sequentially through resistance R13 and electric capacity C7 ground connection, and the negative pole of the diode D6 is grounded by electric capacity C8.
It is further preferred that the model LM358 of the four-operational amplifier.
Beneficial effects of the present invention are as follows：
The present invention can avoid the audio signal of higher magnitude from inputting the damage or so that various caused to audio multiplying arrangement
The generation of distorted signals phenomenon.It not only can be widely applied to audio multiplying arrangement, can also be widely used in radio and set
It is standby.
Brief description of the drawings
Fig. 1 is a kind of module map of the better embodiment of the adjustable audio signal automatic amplitude limiting apparatus of threshold value of the present invention.
Fig. 2 is a kind of circuit diagram of the better embodiment of the adjustable audio signal automatic amplitude limiting apparatus of threshold value of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described further：
Fig. 1 is referred to, the present invention relates to a kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value, its better embodiment
Including amplitude attenuation circuit, absolute value circuit and threshold regulating circuit.
The amplitude attenuation circuit, for receiving the feedback signal from threshold regulating circuit, preset so that amplitude exceedes
The audio input signal Vi of threshold value amplitude attenuation is extremely less than or equal to the predetermined threshold value.Wherein, less than the predetermined threshold value,
I.e. amplitude can be decayed between the 50%~100% of predetermined threshold value more than the audio input signal Vi of predetermined threshold value amplitude
Any one value.
The absolute value circuit, for obtaining the audio output signal Vo of amplitude attenuation circuit to obtain amplitude as positive sound
Frequency signal, and by the amplitude be positive audio signal transmission to threshold regulating circuit.
The threshold regulating circuit, exceed predetermined threshold value for the amplitude that the amplitude is positive audio signal ought to be determined
When, then to feedback signal described in the amplitude attenuation circuit output.
Specifically, threshold regulating circuit can set certain threshold value as needed, when amplitude is that positive audio signal does not have
When having more than the threshold value of setting, by the audio input signal of amplitude attenuation circuit without amplitude attenuation.When passing through absolute value
When the amplitude that circuit obtains is the threshold value that positive audio signal exceedes setting, then pass through the audio input signal of amplitude attenuation circuit
It is automatic to carry out amplitude attenuation.
Wherein, as shown in Fig. 2 amplitude attenuation circuit is put including photo-coupler U5, resistance R1, resistance R2 and the first computing
Big device U1.
Specifically, the resistive element of photo-coupler one end 1 and resistance R1 one end with the first signal input part phase
Even, the other end of the resistance R1 is connected with the first operational amplifier U1 reverse input end 2, the resistance member of the photo-coupler
The other end 2 of part is connected by resistance R2 with the first operational amplifier U1 positive input 3, the luminous member of the photo-coupler
One end 3 of part is connected with the output end of threshold regulating circuit, and the other end 4 of the light-emitting component of the photo-coupler is grounded, described
First operational amplifier U1 output end 1 is connected with the input of absolute value circuit；
Wherein, the output end 1 of the first operational amplifier U1 is also the first signal output part, the first signal input
Hold for inputting audio input signal Vi, first signal output part is used to export audio output signal Vo.In the present embodiment,
First signal input part is the input of amplitude attenuation circuit, and the first signal output part is the output of amplitude attenuation circuit
End.
It is further preferred that the amplitude attenuation circuit also includes electric capacity C1, electric capacity C2, resistance R3 and resistance R4；Institute
The one end for stating electric capacity C1 is connected with the first operational amplifier U1 reverse input end 2, the other end of the electric capacity C1 and the first fortune
The output end 1 for calculating amplifier U1 is connected, and the resistance R3 is in parallel with electric capacity C1；One end of the electric capacity C2 and the first operation amplifier
Device U1 positive input 3 is connected, the other end ground connection of the electric capacity C2, and the resistance R4 is in parallel with electric capacity C2.Electric capacity C1 and
Electric capacity C2 plays filter action, and resistance R3 and resistance R4 play metering function.Wherein, the first operational amplifier U1 model can
Think NE5532.The model of photo-coupler can be LCR0202.Photo-coupler includes a light emitting diode and a photo resistance,
Wherein light emitting diode is then above-mentioned light-emitting component, and photo resistance is then above-mentioned resistive element, the resistance of the photo resistance
Change with the change of the brightness of light emitting diode, that is, flow through that the electric current of light emitting diode is bigger, the resistance of photo resistance is got over
It is small.
Specifically, the absolute value circuit include resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10,
Diode D1, diode D2, the second operational amplifier U2 and the 3rd operational amplifier U3, resistance R5 one end and threshold value are adjusted
The output end of circuit is connected, and the other end of the resistance R5 passes through resistance R6 and the second operational amplifier U2 positive input 3
It is connected, the positive pole of the reverse input end 2 and output end 1 of the second operational amplifier U2 with diode D1 is connected, described
Second operational amplifier U2 reverse input end 2 is also connected by resistance R7 with the 3rd operational amplifier U3 reverse input end 2,
The positive input ground connection of the 3rd operational amplifier U3, the reverse input end 2 of the 3rd operational amplifier U3 also pass through
Resistance R8 is connected with diode D2 positive pole, and the output end 1 of the 3rd operational amplifier U3 is connected with diode D2 positive pole,
The negative pole of the negative pole of the diode D1 and diode D2 negative pole with diode D3 is connected, the positive pole of the diode D3
It is connected by resistance R9 with first voltage input V1, the negative pole of the diode D1 and diode D2 negative pole pass through electricity
Resistance R10 is connected with second voltage input V2, and the positive pole of the diode D3 is also connected with the input of threshold regulating circuit.
Wherein, the model of the second operational amplifier U2 and the 3rd operational amplifier U3 can be NE5532.Together
When, the magnitude of voltage of first voltage input V1 inputs can be+15V, and second voltage input V2 magnitude of voltage can be -15V.
Specifically, the threshold regulating circuit include four-operational amplifier U4, resistance R11, resistance R12, resistance R14,
Resistance R15, diode D4, voltage-stabiliser tube D5 and diode D6, the positive input of the four-operational amplifier U4 with definitely
The output end of value circuit is connected, the reverse input end of the four-operational amplifier U4 by resistance R11 and diode D4 just
Extremely it is connected, the reverse input end of the four-operational amplifier U4 is grounded by resistance R14, and the resistance R15 and resistance R14 is simultaneously
Connection, the output end of the four-operational amplifier U4 are connected with diode D4 positive pole, the positive pole of the diode D4 and voltage stabilizing
Pipe D5 negative pole is connected, and the positive pole of the voltage-stabiliser tube D5 is connected by resistance R12 with diode D6 positive pole, the diode D6
Negative pole be connected with the feedback signal reception end of amplitude attenuation circuit.
Voltage-stabiliser tube D5 conducting voltage can be 9.1V, it is of course possible to select the steady of different conducting voltages according to being actually needed
Pressure pipe.Here conducting voltage is default threshold value, and the amplitude only obtained from absolute value circuit surpasses for positive audio signal
The default threshold value is crossed, voltage-stabiliser tube D5 here can just be turned on, and now threshold regulating circuit can just send and feed back signal to amplitude
Attenuator circuit.If being not above the threshold value of setting, amplitude attenuation circuit does not have feedback voltage, then will not be to ensuing audio
Input signal is decayed.
In the case of given audio input signal Vi, regulation four-operational amplifier U4, resistance R11, resistance R14 with
And resistance R15 parameter, will change automatically threshold regulating circuit setting threshold value size；If four-operational amplifier
U4, resistance R11, resistance R14 and resistance R15 parameter constant, the change of voltage-stabiliser tube D3 parameter can also change threshold value tune
Save the size of the threshold value of circuit configuration.
Wherein, the threshold regulating circuit also includes resistance R13, electric capacity C7 and electric capacity C8, and the voltage-stabiliser tube D5 is just
Pole passes sequentially through resistance R13 and electric capacity C7 ground connection, and the negative pole of the diode D6 is grounded by electric capacity C8.Further preferably
, the model LM358 of the four-operational amplifier U4.
In the present embodiment, the concrete operating principle of circuit is as follows：
When audio input signal Vi inputs amplitude attenuation circuit by the first signal input part, and by the first signal output part
Export audio output signal Vo.Now, absolute value circuit obtains the audio output signal Vo from amplitude attenuation circuit, the audio
Output signal Vo enters the second operational amplifier U2 positive input by resistance R5 and resistance R6.
Wherein, if audio output signal Vo is malleation audio signal, the signal can directly pass through the second operational amplifier
U2 and diode D1 because diode D3 effect, now the magnitude of voltage of four-operational amplifier U4 positive input with
The magnitude of voltage of second operational amplifier U2 output end is equal, therefore passes through four-operational amplifier equivalent to the malleation audio signal
After U4 outputs, by diode D4, voltage-stabiliser tube D5 is reached.If the electricity of four-operational amplifier U4 malleation audio signal should be passed through
Conducting voltage of the pressure more than voltage-stabiliser tube D5, then voltage-stabiliser tube D5 conductings, the malleation audio for now passing through four-operational amplifier U4 are believed
Number after resistance R12 and diode D6, then as a feedback voltage, the photo-coupler of amplitude attenuation circuit is excited to work,
The resistance of photo resistance i.e. inside adjust automatically photo-coupler, now ensuing audio input signal Vi is caused to pass through amplitude
Certain amplitude is decayed to after attenuator circuit, that is, is decayed to less than default threshold value, it is precipitate so as to avoid or prevent
Damage of the input of the audio signal of higher magnitude to audio multiplying arrangement or wireless device, or cause distorted signals phenomenon
Generation.
Wherein, if audio output signal is negative pressure audio signal, now the second operational amplifier U2 output of output end 1 is negative
Pressure, now diode D1 is reverse blocking state, and now the negative pressure audio signal passes through the reverse defeated of the 3rd operational amplifier U3
Enter the input of end 2, and exported by the 3rd operational amplifier U3 output end 1, so as to obtain it is anti-phase after malleation audio signal.Should
The malleation audio signal obtained after inverted, by diode D4, reaches voltage-stabiliser tube after four-operational amplifier U4 outputs
D5.If should by four-operational amplifier U4 it is inverted after the obtained voltage of malleation audio signal leading more than voltage-stabiliser tube D5
Be powered pressure, then voltage-stabiliser tube D5 is turned on, now by four-operational amplifier U4 it is inverted after obtained malleation audio signal pass through
After crossing resistance R12 and diode D6, then as a feedback voltage, the photo-coupler of amplitude attenuation circuit is excited to work, i.e., certainly
The resistance of photo resistance inside dynamic adjustment photo-coupler, now causes ensuing audio input signal to pass through amplitude attenuation electricity
Certain amplitude is decayed to after road, that is, is decayed to less than default threshold value, so as to avoid or prevent precipitate larger amplitude
Damage of the input of the audio signal of value to audio multiplying arrangement or wireless device, or cause the hair of distorted signals phenomenon
It is raw.
For those skilled in the art, technical scheme that can be as described above and design, make other each
Kind is corresponding to be changed and deforms, and all these change and deformed the protection model that should all belong to the claims in the present invention
Within enclosing.
Claims (10)
1. a kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value, it is characterised in that including amplitude attenuation circuit, absolute value electricity
Road and threshold regulating circuit；
The amplitude attenuation circuit, for receiving the feedback signal from threshold regulating circuit, so that amplitude exceedes predetermined threshold value
Audio input signal amplitude attenuation to being less than or equal to the predetermined threshold value；
The absolute value circuit, the audio output signal for obtaining amplitude attenuation circuit are believed using obtaining amplitude as positive audio
Number, and by the amplitude be positive audio signal transmission to threshold regulating circuit；
The threshold regulating circuit, for when determine the amplitude be positive audio signal amplitude exceed predetermined threshold value when,
Then to feedback signal described in the amplitude attenuation circuit output.
2. the adjustable audio signal automatic amplitude limiting apparatus of threshold value as claimed in claim 1, it is characterised in that：The amplitude attenuation
Circuit includes photo-coupler, resistance R1, resistance R2 and the first operational amplifier；
One end of the resistive element of the photo-coupler and resistance R1 one end are connected with the first signal input part, the electricity
The resistance R1 other end is connected with the reverse input end of the first operational amplifier, and the other end of the resistive element of the photo-coupler leads to
The positive input that resistance R2 is crossed with the first operational amplifier is connected, and one end and the threshold value of the light-emitting component of the photo-coupler are adjusted
The output end on economize on electricity road is connected, the other end of the light-emitting component of photo-coupler ground connection, first operational amplifier it is defeated
Go out end with the input of absolute value circuit to be connected；
Wherein, the output end of first operational amplifier is also the first signal output part, and first signal input part is used for
Audio input signal is inputted, first signal output part is used to export audio output signal.
3. the adjustable audio signal automatic amplitude limiting apparatus of threshold value as claimed in claim 2, it is characterised in that：The amplitude attenuation
Circuit also includes electric capacity C1, electric capacity C2, resistance R3 and resistance R4；One end of the electric capacity C1 is anti-with the first operational amplifier
It is connected to input, the other end of the electric capacity C1 is connected with the output end of the first operational amplifier, the resistance R3 and electric capacity
C1 is in parallel；One end of the electric capacity C2 is connected with the positive input of the first operational amplifier, another termination of the electric capacity C2
Ground, the resistance R4 are in parallel with electric capacity C2.
4. the adjustable audio signal automatic amplitude limiting apparatus of threshold value as claimed in claim 2, it is characterised in that：First computing
The model NE5532 of amplifier.
5. the adjustable audio signal automatic amplitude limiting apparatus of threshold value as claimed in claim 2, it is characterised in that：The photo-coupler
Model LCR0202.
6. the adjustable audio signal automatic amplitude limiting apparatus of threshold value as claimed in claim 1, it is characterised in that：The absolute value electricity
Put including resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, diode D1, diode D2, the second computing on road
Big device and the 3rd operational amplifier, one end of the resistance R5 are connected with the output end of threshold regulating circuit, the resistance R5
The other end be connected by resistance R6 with the positive input of the second operational amplifier, second operational amplifier it is reverse defeated
Enter the positive pole of end and output end with diode D1 to be connected, the reverse input end of second operational amplifier also passes through resistance
R7 is connected with the reverse input end of the 3rd operational amplifier, the positive input of the 3rd operational amplifier ground connection, and described the
The reverse input end of three operational amplifiers is also connected by resistance R8 with diode D2 positive pole, the 3rd operational amplifier
Output end is connected with diode D2 positive pole, and the negative pole of the diode D1 and diode D2 negative pole are with diode D3's
Negative pole is connected, and the positive pole of the diode D3 is connected by resistance R9 with first voltage input, the negative pole of the diode D1
And diode D2 negative pole is connected by resistance R10 with second voltage input, the positive pole of the diode D3 also with threshold
The input of value regulation circuit is connected.
7. the adjustable audio signal automatic amplitude limiting apparatus of threshold value as claimed in claim 6, it is characterised in that：Second computing
The model of amplifier and the 3rd operational amplifier is NE5532.
8. the adjustable audio signal automatic amplitude limiting apparatus of threshold value as claimed in claim 1, it is characterised in that：The threshold value regulation
Circuit include four-operational amplifier, resistance R11, resistance R12, resistance R14, resistance R15, diode D4, voltage-stabiliser tube D5 and
Diode D6, the positive input of the four-operational amplifier are connected with the output end of absolute value circuit, the 4th computing
The reverse input end of amplifier is connected by resistance R11 with diode D4 positive pole, the four-operational amplifier it is reverse defeated
Enter end to be grounded by resistance R14, the resistance R15 is in parallel with resistance R14, output end and two poles of the four-operational amplifier
Pipe D4 positive pole is connected, and the positive pole of the diode D4 is connected with voltage-stabiliser tube D5 negative pole, and the positive pole of the voltage-stabiliser tube D5 passes through
Resistance R12 is connected with diode D6 positive pole, the negative pole of the diode D6 and the feedback signal reception end of amplitude attenuation circuit
It is connected.
9. the adjustable audio signal automatic amplitude limiting apparatus of threshold value as claimed in claim 8, it is characterised in that：The threshold value regulation
Circuit also includes resistance R13, electric capacity C7 and electric capacity C8, the positive pole of the voltage-stabiliser tube D5 pass sequentially through resistance R13 and electric capacity
C7 is grounded, and the negative pole of the diode D6 is grounded by electric capacity C8.
10. the adjustable audio signal automatic amplitude limiting apparatus of threshold value as claimed in claim 8, it is characterised in that：4th fortune
Calculate the model LM358 of amplifier.
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| CN201510471603.4A CN105007050B (en) | 2015-07-31 | 2015-07-31 | A kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value |
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| CN201510471603.4A CN105007050B (en) | 2015-07-31 | 2015-07-31 | A kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106973340A (en) * | 2016-01-13 | 2017-07-21 | 深圳市三诺数字科技有限公司 | A kind of audio amplitude limiting circuit |
| CN109586711B (en) * | 2018-11-16 | 2023-07-18 | 广东核电合营有限公司 | Signal adjusting device and electronic equipment |
| CN117241174B (en) * | 2023-11-10 | 2024-02-23 | 杭州海康威视数字技术股份有限公司 | Audio processing circuit and apparatus |
| CN117240241B (en) * | 2023-11-10 | 2024-02-23 | 杭州海康威视数字技术股份有限公司 | Audio signal processing circuit for camera and camera |
| CN118042356B (en) * | 2024-04-12 | 2024-07-30 | 杭州海康威视数字技术股份有限公司 | Audio processing circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2365818Y (en) * | 1999-01-14 | 2000-02-23 | 江苏新科电子集团公司 | Power amplifing device for power amplifier |
| CN101102160A (en) * | 2007-06-13 | 2008-01-09 | 华为技术有限公司 | Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver |
| CN204721319U (en) * | 2015-07-31 | 2015-10-21 | 广州飞达音响股份有限公司 | The audio signal automatic amplitude limiting apparatus that a kind of threshold value is adjustable |
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2015
- 2015-07-31 CN CN201510471603.4A patent/CN105007050B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2365818Y (en) * | 1999-01-14 | 2000-02-23 | 江苏新科电子集团公司 | Power amplifing device for power amplifier |
| CN101102160A (en) * | 2007-06-13 | 2008-01-09 | 华为技术有限公司 | Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver |
| CN204721319U (en) * | 2015-07-31 | 2015-10-21 | 广州飞达音响股份有限公司 | The audio signal automatic amplitude limiting apparatus that a kind of threshold value is adjustable |
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