CN105007050A - Automatic audio signal amplitude limiting device with adjustable threshold value - Google Patents
Automatic audio signal amplitude limiting device with adjustable threshold value Download PDFInfo
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- CN105007050A CN105007050A CN201510471603.4A CN201510471603A CN105007050A CN 105007050 A CN105007050 A CN 105007050A CN 201510471603 A CN201510471603 A CN 201510471603A CN 105007050 A CN105007050 A CN 105007050A
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Abstract
The invention relates to an automatic audio signal amplitude limiting device with an adjustable threshold value. The automatic audio signal amplitude limiting device comprises an amplitude attenuation circuit, an absolute value circuit and a threshold value adjusting circuit, wherein the amplitude attenuation circuit is used for receiving a feedback signal from the threshold value adjusting circuit to allow the amplitude, which exceeds a preset threshold value, of an audio input signal to attenuate to be lower than the preset threshold value; the absolute value circuit is used for obtaining an audio output signal of the amplitude attenuation circuit to get an audio signal with positive amplitude, and transmitting the audio signal with positive amplitude to the threshold value adjusting circuit; and the threshold value adjusting circuit is used for outputting a feedback signal to the amplitude attenuation circuit when judging that the amplitude of the audio signal with positive amplitude exceeds the preset threshold value. According to the automatic audio signal amplitude limiting device with the adjustable threshold value, damage to audio amplifying equipment or various signal distortion phenomena caused by the audio signals with large amplitudes can be avoided.
Description
Technical field
The present invention relates to electronic device field, particularly relate to the audio signal automatic amplitude limiting apparatus that a kind of threshold value is adjustable.
Background technology
After entering 21 century, various portable electronic equipment becomes a kind of important development trend of electronic equipment, and it comprises mobile phone as means of communication and the notebook computer that is convenient for carrying, even also comprises the MP3 player etc. as amusement equipment.These portable electronic equipments all possess a common ground, and that is exactly have audio frequency to export, and namely each electronic equipment all needs an audio frequency amplifier.High efficiency audio frequency amplifier does not just need in portable equipment, also needs in powerful electronic equipment.And the improvement of living conditions along with people, high-fidelity audio equipment and more high-grade home theater also start to rise gradually.In such devices, the audio power of tens watts of even several hectowatts is often needed.At this moment, low distortion, high efficiency audio frequency amplifier just become critical component wherein.
But in the application of audio frequency amplifier; usually can run into input signal is some special state such as non-standard signal; 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 the peak power output of setting; it not only can cause damage to audio frequency amplifier; also may cause the generation of various distorted signals phenomenon, may there is irreversible fault to all the other equipment making to be connected with audio frequency amplifier in serious.
At present, although there is people to propose the method for some solution relevant issues, as the input at audio frequency amplifier increases automatic volume control circuit, audio amplitude with input adjusts gain automatically, but automatic volume control circuit is comparatively complicated, and cost is higher, and response speed is slower.
Summary of the invention
For the deficiencies in the prior art, object of the present invention is intended to provide a kind of and avoids the input of the audio signal of higher magnitude to cause the damage of audio frequency multiplying arrangement or the adjustable audio signal automatic amplitude limiting apparatus of the threshold value that makes various distorted signals phenomenon occur.
For achieving the above object, the present invention adopts following technical scheme:
The audio signal automatic amplitude limiting apparatus that threshold value is adjustable, comprises amplitude attenuation circuit, absolute value circuit and threshold regulating circuit;
Described amplitude attenuation circuit, for receiving the feedback signal from threshold regulating circuit, exceedes the amplitude attenuation of the audio input signal of predetermined threshold value extremely less than or equal to described predetermined threshold value to make amplitude;
Described absolute value circuit is positive audio signal for the audio output signal obtaining amplitude attenuation circuit to obtain amplitude, and is that positive audio signal transmission is to threshold regulating circuit by this amplitude;
Described threshold regulating circuit, for when determine described amplitude be the amplitude of positive audio signal exceed predetermined threshold value time, then export described feedback signal to described amplitude attenuation circuit.
Preferably, described amplitude attenuation circuit comprises optical coupler, resistance R1, resistance R2 and the first operational amplifier;
One end of the resistive element of described optical coupler and one end of resistance R1 are all connected with the first signal input part, the other end of described resistance R1 is connected with the reverse input end of the first operational amplifier, the other end of the resistive element of described optical coupler is connected with the positive input of the first operational amplifier by resistance R2, one end of the light-emitting component of described optical coupler is connected with the output of threshold regulating circuit, the other end ground connection of the light-emitting component of described optical coupler, the described output of the first operational amplifier is connected with the input of absolute value circuit;
Wherein, the output of described first operational amplifier is also the first signal output part, and described first signal input part is for inputting audio input signal, and described first signal output part is used for output audio output signal.
Preferably, described amplitude attenuation circuit also comprises electric capacity C1, electric capacity C2, resistance R3 and resistance R4; One end of described electric capacity C1 is connected with the reverse input end of the first operational amplifier, and the other end of described electric capacity C1 is connected with the output of the first operational amplifier, and described resistance R3 is in parallel with electric capacity C1; One end of described electric capacity C2 is connected with the positive input of the first operational amplifier, the other end ground connection of described electric capacity C2, and described resistance R4 is in parallel with electric capacity C2.
Preferred further, the model of described first operational amplifier is NE5532.
Preferred further, the model of described optical coupler is LCR0202.
Preferably, described absolute value circuit comprises resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, diode D1, diode D2, second operational amplifier and the 3rd operational amplifier, described one end of resistance R5 is connected with the output of threshold regulating circuit, the other end of described resistance R5 is connected with the positive input of the second operational amplifier by resistance R6, reverse input end and the output of described second operational amplifier are all connected with the positive pole of diode D1, the reverse input end of described second operational amplifier is also connected with the reverse input end of the 3rd operational amplifier by resistance R7, the positive input ground connection of described 3rd operational amplifier, the reverse input end of described 3rd operational amplifier is also connected with the positive pole of diode D2 by resistance R8, the output of described 3rd operational amplifier is connected with the positive pole of diode D2, the negative pole of described diode D1 and the negative pole of diode D2 are all connected with the negative pole of diode D3, the positive pole of described diode D3 is connected with the first voltage input end by resistance R9, the negative pole of described diode D1 and the negative pole of diode D2 are all connected with the second voltage input end by resistance R10, the positive pole of described diode D3 is also connected with the input of threshold regulating circuit.
Preferably, the model of described second operational amplifier and the 3rd operational amplifier is NE5532.
Preferred further, described threshold regulating circuit comprises four-operational amplifier, resistance R11, resistance R12, resistance R14, resistance R15, diode D4, voltage-stabiliser tube D5 and diode D6, the described positive input of four-operational amplifier is connected with the output of absolute value circuit, the reverse input end of described four-operational amplifier is connected with the positive pole of diode D4 by resistance R11, the reverse input end of described four-operational amplifier is by resistance R14 ground connection, described resistance R15 is in parallel with resistance R14, the output of described four-operational amplifier is connected with the positive pole of diode D4, the positive pole of described diode D4 is connected with the negative pole of voltage-stabiliser tube D5, the positive pole of described voltage-stabiliser tube D5 is connected with the positive pole of diode D6 by resistance R12, the negative pole of described diode D6 is connected with the feedback signal reception end of amplitude attenuation circuit.
Preferably, described threshold regulating circuit also comprises resistance R13, electric capacity C7 and electric capacity C8, and the positive pole of described voltage-stabiliser tube D5 is successively by resistance R13 and electric capacity C7 ground connection, and the negative pole of described diode D6 is by electric capacity C8 ground connection.
Preferred further, the model of described four-operational amplifier is LM358.
Beneficial effect of the present invention is as follows:
The present invention can avoid the input of the audio signal of higher magnitude to cause the damage of audio frequency multiplying arrangement or the generation making various distorted signals phenomenon.It not only can be widely used in audio frequency multiplying arrangement, also can be widely used in wireless device.
Accompanying drawing explanation
Fig. 1 is the module map of the better embodiment of the adjustable audio signal automatic amplitude limiting apparatus of a kind of threshold value of the present invention.
Fig. 2 is the circuit diagram of the better embodiment of the adjustable audio signal automatic amplitude limiting apparatus of a kind of threshold value of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described further:
Refer to Fig. 1, the present invention relates to the audio signal automatic amplitude limiting apparatus that a kind of threshold value is adjustable, its better embodiment comprises amplitude attenuation circuit, absolute value circuit and threshold regulating circuit.
Described amplitude attenuation circuit, for receiving the feedback signal from threshold regulating circuit, exceedes the amplitude attenuation of the audio input signal Vi of predetermined threshold value extremely less than or equal to described predetermined threshold value to make amplitude.Wherein, lower than described predetermined threshold value, the amplitude that namely amplitude exceedes the audio input signal Vi of predetermined threshold value can decay to predetermined threshold value 50% ~ 100% between any one value.
Described absolute value circuit is positive audio signal for the audio output signal Vo obtaining amplitude attenuation circuit to obtain amplitude, and is that positive audio signal transmission is to threshold regulating circuit by this amplitude.
Described threshold regulating circuit, for when determine described amplitude be the amplitude of positive audio signal exceed predetermined threshold value time, then export described feedback signal to described amplitude attenuation circuit.
Concrete, threshold regulating circuit can set certain threshold value as required, when amplitude be positive audio signal do not exceed the threshold value of setting time, do not carry out amplitude attenuation by the audio input signal of amplitude attenuation circuit.When the amplitude obtained by absolute value circuit be positive audio signal exceed the threshold value of setting time, then automatically carry out amplitude attenuation by the audio input signal of amplitude attenuation circuit.
Wherein, as shown in Figure 2, amplitude attenuation circuit comprises optical coupler U5, resistance R1, resistance R2 and the first operational amplifier U1.
Concrete, one end 1 of the resistive element of optical coupler and one end of resistance R1 are all connected with the first signal input part, the other end of described resistance R1 is connected with the reverse input end 2 of the first operational amplifier U1, the other end 2 of the resistive element of described optical coupler is connected with the positive input 3 of the first operational amplifier U1 by resistance R2, one end 3 of the light-emitting component of described optical coupler is connected with the output of threshold regulating circuit, the other end 4 ground connection of the light-emitting component of described optical coupler, the output 1 of described first operational amplifier U1 is connected with the input of absolute value circuit,
Wherein, the output 1 of described first operational amplifier U1 is also the first signal output part, and described first signal input part is for inputting audio input signal Vi, and described first signal output part is used for output audio output signal Vo.In the present embodiment, the first signal input part is the input of amplitude attenuation circuit, and the first signal output part is the output of amplitude attenuation circuit.
Preferred further, described amplitude attenuation circuit also comprises electric capacity C1, electric capacity C2, resistance R3 and resistance R4; One end of described electric capacity C1 is connected with the reverse input end 2 of the first operational amplifier U1, and the other end of described electric capacity C1 is connected with the output 1 of the first operational amplifier U1, and described resistance R3 is in parallel with electric capacity C1; One end of described electric capacity C2 is connected with the positive input 3 of the first operational amplifier U1, the other end ground connection of described electric capacity C2, and described 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 plays metering function.Wherein, the model of the first operational amplifier U1 can be NE5532.The model of optical coupler can be LCR0202.Optical coupler comprises a light-emitting diode and a photo resistance, wherein light-emitting diode is then above-mentioned light-emitting component, photo resistance is then above-mentioned resistive element, the resistance of this photo resistance changes along with the change of the brightness of light-emitting diode, namely the electric current flowing through light-emitting diode is larger, and the resistance of photo resistance is less.
Concrete, described absolute value circuit comprises resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, diode D1, diode D2, second operational amplifier U2 and the 3rd operational amplifier U3, one end of resistance R5 is connected with the output of threshold regulating circuit, the other end of described resistance R5 is connected with the positive input 3 of the second operational amplifier U2 by resistance R6, reverse input end 2 and the output 1 of described second operational amplifier U2 are all connected with the positive pole of diode D1, the reverse input end 2 of described second operational amplifier U2 is also connected with the reverse input end 2 of the 3rd operational amplifier U3 by resistance R7, the positive input ground connection of described 3rd operational amplifier U3, the reverse input end 2 of described 3rd operational amplifier U3 is also connected with the positive pole of diode D2 by resistance R8, the output 1 of described 3rd operational amplifier U3 is connected with the positive pole of diode D2, the negative pole of described diode D1 and the negative pole of diode D2 are all connected with the negative pole of diode D3, the positive pole of described diode D3 is connected with the first voltage input end V1 by resistance R9, the negative pole of described diode D1 and the negative pole of diode D2 are all connected with the second voltage input end V2 by resistance R10, the positive pole of described diode D3 is also connected with the input of threshold regulating circuit.
Wherein, the model of described second operational amplifier U2 and the 3rd operational amplifier U3 can be all NE5532.Meanwhile, the magnitude of voltage that the first voltage input end V1 inputs can be+15V, and the magnitude of voltage of the second voltage input end V2 can be-15V.
Concrete, described threshold regulating circuit comprises four-operational amplifier U4, resistance R11, resistance R12, resistance R14, resistance R15, diode D4, voltage-stabiliser tube D5 and diode D6, the described positive input of four-operational amplifier U4 is connected with the output of absolute value circuit, the reverse input end of described four-operational amplifier U4 is connected with the positive pole of diode D4 by resistance R11, the reverse input end of described four-operational amplifier U4 is by resistance R14 ground connection, described resistance R15 is in parallel with resistance R14, the output of described four-operational amplifier U4 is connected with the positive pole of diode D4, the positive pole of described diode D4 is connected with the negative pole of voltage-stabiliser tube D5, the positive pole of described voltage-stabiliser tube D5 is connected with the positive pole of diode D6 by resistance R12, the negative pole of described diode D6 is connected with the feedback signal reception end of amplitude attenuation circuit.
The conducting voltage of voltage-stabiliser tube D5 can be 9.1V, certainly can select the voltage-stabiliser tube of different conducting voltage according to actual needs.Here conducting voltage is default threshold value, and the amplitude only obtained from absolute value circuit is that positive audio signal exceedes this default threshold value, and the just meeting conducting of voltage-stabiliser tube D5 here, now threshold regulating circuit just can send and feed back signal to amplitude attenuation circuit.If do not exceed the threshold value of setting, then amplitude attenuation circuit does not have feedback voltage, then can not decay to ensuing audio input signal.
When given audio input signal Vi, regulate the parameter of four-operational amplifier U4, resistance R11, resistance R14 and resistance R15, automatically will change the size of the threshold value of threshold regulating circuit setting; If the parameter constant of four-operational amplifier U4, resistance R11, resistance R14 and resistance R15, the change of the parameter of voltage-stabiliser tube D3 also can change the size of the threshold value of threshold regulating circuit setting.
Wherein, described threshold regulating circuit also comprises resistance R13, electric capacity C7 and electric capacity C8, and the positive pole of described voltage-stabiliser tube D5 is successively by resistance R13 and electric capacity C7 ground connection, and the negative pole of described diode D6 is by electric capacity C8 ground connection.Preferred further, the model of described four-operational amplifier U4 is LM358.
In the present embodiment, the specific works principle of circuit is as follows:
When audio input signal Vi is by the first signal input part input amplitude attenuation circuit, and output signal Vo by the first signal output part output audio.Now, absolute value circuit obtains the audio output signal Vo from amplitude attenuation circuit, and this audio output signal Vo enters the positive input of the second operational amplifier U2 by resistance R5 and resistance R6.
Wherein, if audio output signal Vo is malleation audio signal, then this signal directly can pass through the second operational amplifier U2 and diode D1, because the effect of diode D3, now the magnitude of voltage of the positive input of four-operational amplifier U4 is equal with the magnitude of voltage of the output of the second operational amplifier U2, therefore be equivalent to this malleation audio signal after four-operational amplifier U4 exports, by diode D4, arrive voltage-stabiliser tube D5.If the conducting voltage of voltage-stabiliser tube D5 should be greater than by the voltage of the malleation audio signal of four-operational amplifier U4, then voltage-stabiliser tube D5 conducting, now pass through the malleation audio signal of four-operational amplifier U4 after resistance R12 and diode D6, then as a feedback voltage, excite the optical coupler work of amplitude attenuation circuit, the i.e. resistance of the photo resistance of adjustment optical coupler inside automatically, now make ensuing audio input signal Vi by decaying to certain amplitude after amplitude attenuation circuit, namely decay to and be less than default threshold value, thus avoid or prevent the input of audio signal of precipitate higher magnitude to the damage of audio frequency multiplying arrangement or wireless device, or cause the generation of distorted signals phenomenon.
Wherein, if audio output signal is negative pressure audio signal, now the output 1 of the second operational amplifier U2 exports negative pressure, now diode D1 is reverse blocking state, now this negative pressure audio signal is inputted by the reverse input end 2 of the 3rd operational amplifier U3, and exported by the output 1 of the 3rd operational amplifier U3, thus obtain anti-phase after malleation audio signal.The malleation audio signal that this obtains after anti-phase, after four-operational amplifier U4 exports, by diode D4, arrives voltage-stabiliser tube D5.If the conducting voltage of voltage-stabiliser tube D5 should be greater than by the voltage of the malleation audio signal obtained after anti-phase of four-operational amplifier U4, then voltage-stabiliser tube D5 conducting, now by the malleation audio signal obtained after anti-phase of four-operational amplifier U4 after resistance R12 and diode D6, then as a feedback voltage, excite the optical coupler work of amplitude attenuation circuit, the i.e. resistance of the photo resistance of adjustment optical coupler inside automatically, now make ensuing audio input signal by decaying to certain amplitude after amplitude attenuation circuit, namely decay to and be less than default threshold value, thus avoid or prevent the input of audio signal of precipitate higher magnitude to the damage of audio frequency multiplying arrangement or wireless device, or cause the generation of distorted signals phenomenon.
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection range of the claims in the present invention.
Claims (10)
1. the audio signal automatic amplitude limiting apparatus that threshold value is adjustable, is characterized in that, comprises amplitude attenuation circuit, absolute value circuit and threshold regulating circuit;
Described amplitude attenuation circuit, for receiving the feedback signal from threshold regulating circuit, exceedes the amplitude attenuation of the audio input signal of predetermined threshold value extremely less than or equal to described predetermined threshold value to make amplitude;
Described absolute value circuit is positive audio signal for the audio output signal obtaining amplitude attenuation circuit to obtain amplitude, and is that positive audio signal transmission is to threshold regulating circuit by this amplitude;
Described threshold regulating circuit, for when determine described amplitude be the amplitude of positive audio signal exceed predetermined threshold value time, then export described feedback signal to described amplitude attenuation circuit.
2. the audio signal automatic amplitude limiting apparatus that threshold value as claimed in claim 1 is adjustable, is characterized in that: described amplitude attenuation circuit comprises optical coupler, resistance R1, resistance R2 and the first operational amplifier;
One end of the resistive element of described optical coupler and one end of resistance R1 are all connected with the first signal input part, the other end of described resistance R1 is connected with the reverse input end of the first operational amplifier, the other end of the resistive element of described optical coupler is connected with the positive input of the first operational amplifier by resistance R2, one end of the light-emitting component of described optical coupler is connected with the output of threshold regulating circuit, the other end ground connection of the light-emitting component of described optical coupler, the described output of the first operational amplifier is connected with the input of absolute value circuit;
Wherein, the output of described first operational amplifier is also the first signal output part, and described first signal input part is for inputting audio input signal, and described first signal output part is used for output audio output signal.
3. the audio signal automatic amplitude limiting apparatus that threshold value as claimed in claim 2 is adjustable, is characterized in that: described amplitude attenuation circuit also comprises electric capacity C1, electric capacity C2, resistance R3 and resistance R4; One end of described electric capacity C1 is connected with the reverse input end of the first operational amplifier, and the other end of described electric capacity C1 is connected with the output of the first operational amplifier, and described resistance R3 is in parallel with electric capacity C1; One end of described electric capacity C2 is connected with the positive input of the first operational amplifier, the other end ground connection of described electric capacity C2, and described resistance R4 is in parallel with electric capacity C2.
4. the audio signal automatic amplitude limiting apparatus that threshold value as claimed in claim 2 is adjustable, is characterized in that: the model of described first operational amplifier is NE5532.
5. the audio signal automatic amplitude limiting apparatus that threshold value as claimed in claim 2 is adjustable, is characterized in that: the model of described optical coupler is LCR0202.
6. the audio signal automatic amplitude limiting apparatus that threshold value as claimed in claim 1 is adjustable, it is characterized in that: described absolute value circuit comprises resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, diode D1, diode D2, second operational amplifier and the 3rd operational amplifier, described one end of resistance R5 is connected with the output of threshold regulating circuit, the other end of described resistance R5 is connected with the positive input of the second operational amplifier by resistance R6, reverse input end and the output of described second operational amplifier are all connected with the positive pole of diode D1, the reverse input end of described second operational amplifier is also connected with the reverse input end of the 3rd operational amplifier by resistance R7, the positive input ground connection of described 3rd operational amplifier, the reverse input end of described 3rd operational amplifier is also connected with the positive pole of diode D2 by resistance R8, the output of described 3rd operational amplifier is connected with the positive pole of diode D2, the negative pole of described diode D1 and the negative pole of diode D2 are all connected with the negative pole of diode D3, the positive pole of described diode D3 is connected with the first voltage input end by resistance R9, the negative pole of described diode D1 and the negative pole of diode D2 are all connected with the second voltage input end by resistance R10, the positive pole of described diode D3 is also connected with the input of threshold regulating circuit.
7. the audio signal automatic amplitude limiting apparatus that threshold value as claimed in claim 6 is adjustable, is characterized in that: the model of described second operational amplifier and the 3rd operational amplifier is NE5532.
8. the audio signal automatic amplitude limiting apparatus that threshold value as claimed in claim 1 is adjustable, it is characterized in that: described threshold regulating circuit comprises four-operational amplifier, resistance R11, resistance R12, resistance R14, resistance R15, diode D4, voltage-stabiliser tube D5 and diode D6, the described positive input of four-operational amplifier is connected with the output of absolute value circuit, the reverse input end of described four-operational amplifier is connected with the positive pole of diode D4 by resistance R11, the reverse input end of described four-operational amplifier is by resistance R14 ground connection, described resistance R15 is in parallel with resistance R14, the output of described four-operational amplifier is connected with the positive pole of diode D4, the positive pole of described diode D4 is connected with the negative pole of voltage-stabiliser tube D5, the positive pole of described voltage-stabiliser tube D5 is connected with the positive pole of diode D6 by resistance R12, the negative pole of described diode D6 is connected with the feedback signal reception end of amplitude attenuation circuit.
9. the audio signal automatic amplitude limiting apparatus that threshold value as claimed in claim 8 is adjustable, it is characterized in that: described threshold regulating circuit also comprises resistance R13, electric capacity C7 and electric capacity C8, the positive pole of described voltage-stabiliser tube D5 is successively by resistance R13 and electric capacity C7 ground connection, and the negative pole of described diode D6 is by electric capacity C8 ground connection.
10. the audio signal automatic amplitude limiting apparatus that threshold value as claimed in claim 8 is adjustable, is characterized in that: the model of described four-operational amplifier is LM358.
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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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109586711A (en) * | 2018-11-16 | 2019-04-05 | 广东核电合营有限公司 | Digital regulating device and electronic equipment |
| CN117241174A (en) * | 2023-11-10 | 2023-12-15 | 杭州海康威视数字技术股份有限公司 | Audio processing circuit and apparatus |
| CN117240241A (en) * | 2023-11-10 | 2023-12-15 | 杭州海康威视数字技术股份有限公司 | Audio signal processing circuit for camera and camera |
Family Cites Families (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 |
| CN101102160B (en) * | 2007-06-13 | 2010-06-09 | 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
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109586711A (en) * | 2018-11-16 | 2019-04-05 | 广东核电合营有限公司 | Digital regulating device and electronic equipment |
| CN117241174A (en) * | 2023-11-10 | 2023-12-15 | 杭州海康威视数字技术股份有限公司 | Audio processing circuit and apparatus |
| CN117240241A (en) * | 2023-11-10 | 2023-12-15 | 杭州海康威视数字技术股份有限公司 | Audio signal processing circuit for camera and camera |
| 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 |
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| CN105007050B (en) | 2018-03-13 |
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Address after: 510820, Guangzhou, Guangdong province Huadu District charcoal step Feida Industrial Park Patentee after: Guangzhou Feida Audio Co.,Ltd. Address before: 510820, Guangzhou, Guangdong province Huadu District charcoal step Feida Industrial Park Patentee before: FIRST AUDIO MANUFACTURING Co.,Ltd. |