CN205491092U - Audio frequency limit circuit - Google Patents
Audio frequency limit circuit Download PDFInfo
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- CN205491092U CN205491092U CN201620030349.4U CN201620030349U CN205491092U CN 205491092 U CN205491092 U CN 205491092U CN 201620030349 U CN201620030349 U CN 201620030349U CN 205491092 U CN205491092 U CN 205491092U
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Abstract
The utility model discloses an audio frequency limit circuit, this audio frequency limit circuit include sampling circuit, amplifier circuit, rectifier circuit, time delay regulator circuit, impedance matching circuit and photo resistance, sampling circuit is used for taking a sample to the audio signal of input, exports amplifier circuit with the audio signal of sample, exports rectifier circuit after enlargeing the audio signal of sample through amplifier circuit, exports the time delay regulator circuit after carrying out the rectification through rectifier circuit to the audio signal after enlargeing, through time delay adjustment circuit regulation audio signal's the time that the amplitude limiting started to control and the amplitude limiting releases to it shunts to export the adjusted audio signal of amplitude limiting to photo resistance. This for the scheme photo resistance add the driven mode and solve in the past limit circuit amplitude limiting range and limited and have a problem of various distortions.
Description
Technical field
This utility model relates to electronic technology field, particularly relates to a kind of audio amplitude limiting circuit.
Background technology
Along with the development of society, people are more and more higher to the quality requirements of sound, not only require to need big dynamic range, and more and more lower to the tolerance thresholding of the distortion of sound.Because audio frequency is a signal persistently changed, and the amplitude of input signal is also being continually changing, but for power amplifier or loudspeaker, himself amplifying power and the power that can bear are limited, complexity due to audio signal, it is difficult to ensure that voltage or electric current are not over maximum, limited power is for the signal of Larger Dynamic, in actual application, will necessarily produce and various cut top, blasting, causing the distortion of waveform, make the quality of sound drastically reduce, serious being likely to directly damages power amplifier or loudspeaker.
Therefore in amplifier circuit for sound frequency signal, it is necessarily required to add amplitude limiter circuit, but in current audio amplitude limiting circuit, a kind of extremely simple, only with diode or triode as amplitude limit, and diode or triode is limited as non-linear element thresholding, the limited extent of amplitude limit will necessarily be made and cause various non-linear distortion；Sound is processed and adds amplitude limit by another kind of employing Digital Signal Processing, in the system of such a set of complexity, sound is through various conversions, process, being mixed into of loss in detail and various noise can be there is unavoidably, and it is with high costs, power supply station additionally, due to Digital Signal Processing limits, and the amplitude for amplitude limit is the most limited.
Utility model content
In order to overcome all deficiencies of existing Related product, the utility model proposes a kind of audio amplitude limiting circuit, the mode adding driving with photoconductive resistance solves conventional amplitude limiter circuit amplitude limit limited extent and the problem that there is various distortion.
This utility model solves its technical problem and be the technical scheme is that
A kind of audio amplitude limiting circuit provided by the utility model, including: sample circuit, amplifying circuit, rectification circuit, delay adjustment circuit and photoconductive resistance；Described sample circuit one ending connecting audio inputs, and the other end is connected with amplifying circuit and photoconductive resistance respectively；One end of described amplifying circuit connects sample circuit, and the other end is connected with one end of rectification circuit；The other end of described rectification circuit is connected with one end of delay adjustment circuit；The other end of described delay adjustment circuit is connected with photoconductive resistance.
As further improvement of the utility model, described sample circuit, comprising the partial ohmic limit of resistance R1 and photoconductive resistance, resistance R1 mono-ending connecting audio inputs, and the other end connects photoconductive resistance and amplifying circuit.
As further improvement of the utility model, described amplifying circuit, comprising resistance R4, R5, R6, electric capacity C2, operational amplifier U1-B, the 5th foot of operational amplifier U1-B is connected to R1 and photoconductive resistance；6th foot of operational amplifier U1-B is connected to resistance R4, R5, R6；7th foot of operational amplifier U1-B is connected to electric capacity C2, resistance R6 and rectification circuit；Electric capacity C2 connects with resistance R5, the series circuit one terminating resistor R6 of C2 Yu R5 and the 6th foot of operational amplifier U1-B, and the other end is connected to the other end of resistance R6 and the 7th foot of operational amplifier U1-B；Resistance R6 mono-terminates the 7th foot and the rectification circuit of operational amplifier U1-B, the 6th foot of another termination operational amplifier U1-B；Resistance R4 mono-terminates the 6th foot of operational amplifier U1-B, other end ground connection.
As further improvement of the utility model, described rectification circuit, comprising diode D1, D2, D3, D4, the positive pole of diode D1 connects the negative pole of D2 and the 7th foot of operational amplifier U1-B, and the negative pole of D1 connects negative pole and the delay adjustment circuit of D3；The positive pole of diode D2 connects the positive pole of D4 and delay adjustment circuit and photoconductive resistance, and the negative pole of D2 connects the positive pole of D1 and the 7th foot of operational amplifier U1-B；The plus earth of diode D3, negative pole connects negative pole and the delay adjustment circuit of D1；The positive pole of diode D4 connects the positive pole of D2 and delay adjustment circuit and photoconductive resistance, minus earth.
As further improvement of the utility model, described delay adjustment circuit, comprise resistance R7, R8, R9 and electrochemical capacitor C1, the negative pole of termination D3 and D1 of resistance R7, one end of the other end connecting resistance R8, R9 and the positive pole of electrochemical capacitor C1；Resistance R8 is in parallel with electrochemical capacitor C1, terminating resistor R7, a R9, the positive pole of another terminating diode D2, D4 and photoconductive resistance；Terminating resistor R7, R8 of resistance R9 and the positive pole of electrochemical capacitor C1, another terminates photoconductive resistance.
As further improvement of the utility model, described photoconductive resistance, comprise resistance and a LED, one end of the 1st foot connecting resistance R9 of photoconductive resistance OPT1 that light reception intensity controls；2nd foot connects the positive pole of diode D2, D4, one end of resistance R8 and the negative pole of electrochemical capacitor C1；3rd foot ground connection；One end of 4th foot connecting resistance R1, the 3rd foot of operational amplifier U1-A and the 5th foot of operational amplifier U1-B；Described 3rd foot and the 4th foot are in sample circuit.
As further improvement of the utility model, described audio amplitude limiting circuit can also include that impedance matching circuit, described impedance matching circuit one end connect sample circuit and amplifying circuit, and another terminates audio output apparatus.
As further improvement of the utility model, described impedance matching circuit, comprise operational amplifier U1-A and resistance R2, R3；One end of the 1st foot connecting resistance R2 of described operational amplifier U1-A and audio output apparatus；2nd foot connecting resistance R2 and R3 of operational amplifier U1-A；3rd foot connecting resistance R1, the 4th foot of photoconductive resistance and the 5th foot of operational amplifier U1-B of operational amplifier U1-A；First foot of the one termination operational amplifier U1-A of resistance R2 and audio output apparatus, the 2nd foot of another termination operational amplifier U1-A and one end of resistance R3；2nd foot of the one termination operational amplifier U1-A of resistance R3, other end ground connection.
Compared with prior art, this utility model has the advantage that
1, the photoconductive resistance used achieves the amplitude limit of audio signal, in signal path, there is no any non-linear element, such as diode, audion etc., thus avoid various non-linear distortion, the most there is not the restriction of the ON-OFF voltage of various diode, audion, so the amplitude of amplitude limit is the biggest, it is to avoid various cut top distortion.
2, use the undistorted amplitude limit of the most succinct circuit realiration, on the one hand provide cost savings, on the other hand it also avoid the tonequality loss that the circuit of complexity is brought.
Accompanying drawing explanation
Fig. 1 is this utility model audio amplitude limiting circuit theory diagram；
Fig. 2 is this utility model audio amplitude limiting circuit circuit theory diagrams.
Detailed description of the invention
For the ease of understanding this utility model, below with reference to relevant drawings, this utility model is described more fully.Accompanying drawing gives preferred embodiment of the present utility model.But, this utility model can realize in many different forms, however it is not limited to embodiment described herein.On the contrary, providing the purpose of these embodiments is to make the understanding to disclosure of the present utility model more thorough comprehensively.
Unless otherwise defined, all of technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model are generally understood that.It is intended merely to describe the purpose of specific embodiment at term used in the description of the present utility model herein, it is not intended that in limiting this utility model.
Refering to shown in Fig. 1, described audio amplitude limiting circuit includes sample circuit, amplifying circuit, rectification circuit, delay adjustment circuit and photoconductive resistance；Described sample circuit one ending connecting audio inputs, and the other end is connected with amplifying circuit and photoconductive resistance respectively；One end of described amplifying circuit connects sample circuit, and the other end is connected with one end of rectification circuit；The other end of described rectification circuit is connected with one end of delay adjustment circuit；The other end of described delay adjustment circuit is connected with photoconductive resistance.
Described audio amplitude limiting circuit can also include that impedance matching circuit, described impedance matching circuit one end connect sample circuit and amplifying circuit, and another terminates audio output apparatus.
Audio signal inputs from sample circuit, and a road to impedance matching circuit exports after overmatching；Described sample circuit is for being sampled the audio signal of input, the audio signal of sampling is exported amplifying circuit, after being amplified the audio signal of sampling by amplifying circuit, output is to rectification circuit, after the audio signal after amplifying being carried out rectification by rectification circuit, output is to delay adjustment circuit, the amplitude limit being adjusted audio signal by delay adjustment circuit is started to control and the time of amplitude limit release, and the audio signal output after amplitude limit adjustment is shunted to photoconductive resistance.
Refering to shown in Fig. 2, described sample circuit, comprise the partial ohmic limit of resistance R1 and photoconductive resistance, resistance R1 mono-ending connecting audio inputs, and the other end connects photoconductive resistance, impedance matching circuit and amplifying circuit；Described sample circuit is for being sampled the audio signal of input.
Described amplifying circuit, comprises resistance R4, R5, R6, electric capacity C2, operational amplifier U1-B, and the 5th foot of operational amplifier U1-B is connected to R1, impedance matching circuit and photoconductive resistance；6th foot of operational amplifier U1-B is connected to resistance R4, R5, R6；7th foot of operational amplifier U1-B is connected to electric capacity C2, resistance R6 and rectification circuit；Electric capacity C2 connects with resistance R5, the series circuit one terminating resistor R6 of C2 Yu R5 and the 6th foot of operational amplifier U1-B, and the other end is connected to the other end of resistance R6 and the 7th foot of operational amplifier U1-B；Resistance R6 mono-terminates the 7th foot and the rectification circuit of operational amplifier U1-B, the 6th foot of another termination operational amplifier U1-B；Resistance R4 mono-terminates the 6th foot of operational amplifier U1-B, other end ground connection；Described amplifying circuit is for being amplified the audio signal after sampling, to allow signal have enough amplitudes to go to drive photoconductive resistance.
Described rectification circuit, comprises diode D1, D2, D3, D4, and the positive pole of diode D1 connects the negative pole of D2 and the 7th foot of operational amplifier U1-B, and the negative pole of D1 connects negative pole and the delay adjustment circuit of D3；The positive pole of diode D2 connects the positive pole of D4 and delay adjustment circuit and photoconductive resistance, and the negative pole of D2 connects the positive pole of D1 and the 7th foot of operational amplifier U1-B；The plus earth of diode D3, negative pole connects negative pole and the delay adjustment circuit of D1；The positive pole of diode D4 connects the positive pole of D2 and delay adjustment circuit and photoconductive resistance, minus earth；Described rectification circuit, for the signal after amplifying is carried out rectification, becomes AC signal into the separate signal of positive-negative half-cycle.
Described delay adjustment circuit, comprises resistance R7, R8, R9 and electrochemical capacitor C1, the negative pole of termination D3 and D1 of resistance R7, one end of the other end connecting resistance R8, R9 and the positive pole of electrochemical capacitor C1；Resistance R8 is in parallel with electrochemical capacitor C1, terminating resistor R7, a R9, the positive pole of another terminating diode D2, D4 and photoconductive resistance；Terminating resistor R7, R8 of resistance R9 and the positive pole of electrochemical capacitor C1, another terminates photoconductive resistance；Described delay adjustment circuit is used for that the amplitude limit of audio signal is started to control the time and amplitude limit is adjusted release time.
Described photoconductive resistance, comprises resistance and a LED, one end of the 1st foot connecting resistance R9 of photoconductive resistance OPT1 that light reception intensity controls；2nd foot connects the positive pole of diode D2, D4, one end of resistance R8 and the negative pole of electrochemical capacitor C1；3rd foot ground connection；One end of 4th foot connecting resistance R1, the 3rd foot of operational amplifier U1-A and the 5th foot of operational amplifier U1-B；Described 3rd foot and the 4th foot are in sample circuit；Described photoconductive resistance is for the size of control signal amplitude.
Described impedance matching circuit, comprises operational amplifier U1-A and resistance R2, R3；One end of the 1st foot connecting resistance R2 of described operational amplifier U1-A and audio output apparatus；2nd foot connecting resistance R2 and R3 of operational amplifier U1-A；3rd foot connecting resistance R1, the 4th foot of photoconductive resistance and the 5th foot of operational amplifier U1-B of operational amplifier U1-A；First foot of the one termination operational amplifier U1-A of resistance R2 and audio output apparatus, the 2nd foot of another termination operational amplifier U1-A and one end of resistance R3；2nd foot of the one termination operational amplifier U1-A of resistance R3, other end ground connection；Described impedance matching circuit is a series voltage negtive backword, and input impedance is big, output impedance is little, reduces the impact on audio amplitude limiting circuit of the successive load circuit, also improves the carrying load ability of audio amplitude limiting circuit simultaneously.
Described audio amplitude limiting circuit work process is as follows:
Audio signal is input to sample circuit, exports from R1, is then divided into three tunnels: a road is input to impedance matching circuit；One tunnel is input to amplifying circuit；Another road is input to the resistance terminal of photoconductive resistance, and input signal is shunted by photoconductive resistance.
The road being input to amplifying circuit enters the 5th foot of operational amplifier U1-B, and U1-B and resistance R4, R5, R6, electric capacity C1 form an in-phase voltage amplifying circuit, can adjust the amplification of amplifying circuit by adjusting the ratio of resistance R6 Yu R4；R6 is the biggest, then amplification is the biggest, and the signal amplitude of output is the biggest, and the voltage after over commutation also can be the highest, can reach the turn-on threshold of the LED of photoconductive resistance faster, thus have adjusted the threshold value of amplitude limiter circuit.The i.e. amplification by adjusting amplifying circuit adjusts the threshold value of amplitude limit: amplification is the biggest, inputs the least signal and the LED of photoconductive resistance just can be made to turn on, and the threshold value of amplitude limit is the least；Amplification is the least, needs to input bigger signal and the LED of photoconductive resistance just can be made to turn on, and the threshold value of amplitude limit is the highest；Additionally C2 and R5 series connection, this series circuit is in parallel with the 6th foot of U1-B and the 7th foot, and this circuit structure is possible to prevent amplifying circuit self-excitation.
Audio signal is after amplifying circuit amplifies, and rectification circuit is arrived in output.The bridge rectifier that described rectification circuit is made up of diode D1, D2, D3, D4, audio signal is become, from exchange, the signal that a positive-negative half-cycle separates, the signal of positive half cycle delivers to the positive pole of the LED of photoconductive resistance OPT1 by delay adjustment circuit, the signal of negative half period delivers to the negative pole of the LED of photoconductive resistance, thus drives LED to carry out luminescence.
The signal that the positive-negative half-cycle that audio signal produces after rectification circuit separates, output is to delay adjustment circuit, after electrochemical capacitor C1 is charged by the positive half cycle of signal by resistance R7, the positive pole of the LED of photoconductive resistance OPT1 is delivered to again by resistance R9, the negative half period of signal is attached directly to the negative pole of the LED of photoconductive resistance OPT1, thus drives LED to carry out luminescence.Wherein, can be by adjusting the size of resistance R7 resistance, adjust the charging interval of electrochemical capacitor C1, R7 resistance is the biggest, and the charging of C1 is the slowest, and the LED of photoconductive resistance OPT1 turns on the most slowly, R7 resistance is the least, the charging of C1 is the fastest, and the LED of photoconductive resistance OPT1 turns on the soonest, thus has reached to adjust amplitude limit and started to control the purpose of time.On the other hand, the size of the resistance of resistance R8 can be adjusted, adjust the discharge time of electrochemical capacitor C1, R8 resistance is the biggest, and the electric discharge of C1 is the slowest, and the LED ON time of photoconductive resistance OPT1 is the longest, R8 resistance is the least, the electric discharge of C1 is the fastest, and the LED ON time of photoconductive resistance OPT1 is the shortest, thus has reached to adjust the purpose of amplitude limit release time.The LED strip connection of described resistance R9 and photoconductive resistance OPT1, can limit the electric current of LED by photoconductive resistance OPT1, thus play the purpose of protection LED.
Audio signal, after amplification, rectification passing through delay adjustment circuit, has been input to the two ends of photoconductive resistance OPT1LED.The resistance of described photoconductive resistance is affected by input signal amplitude, and the amplitude of signal is the biggest, and intensity luminous for LED is the brightest, and the resistance of photoconductive resistance is the least, and the signal of input more will be diverted to ground by photoconductive resistance, and the signal of output diminishes the most accordingly；The amplitude of signal is the least, and intensity luminous for LED is the most weak, and the resistance of photoconductive resistance is the biggest, and input signal less will be diverted to ground by photoconductive resistance, and the signal of output is also the most corresponding becomes big；Thus reached the purpose of amplitude limit.
Audio signal is after amplitude limit, and output to impedance matching circuit, after overmatching, audio signal thus exports.The series voltage negtive backword that described impedance matching circuit is made up of operational amplifier U1-A and resistance R2, R3, it has the characteristics such as input impedance is big, output impedance is little, spread bandwidth, reduction distortion, pass through impedance matching circuit, reduce the impact on audio amplitude limiting circuit of the successive load circuit, also improve the carrying load ability of audio amplitude limiting circuit simultaneously.
This utility model photoconductive resistance achieves the amplitude limit to audio signal, in signal path, there is no any non-linear element, such as diode, audion etc., thus avoid various non-linear distortion, the most there is not the restriction of the ON-OFF voltage of various diode, audion, so the amplitude of amplitude limit is the biggest, it is to avoid various cut top distortion.It uses the undistorted amplitude limit of the most succinct circuit realiration simultaneously, on the one hand provides cost savings, and on the other hand it also avoid the tonequality loss that the circuit of complexity is brought.
Above-described embodiment is this utility model preferably embodiment; but embodiment of the present utility model is also not restricted to the described embodiments; other any without departing from the change made under spirit of the present utility model and principle, modify, substitute, combine, simplify; all should be the substitute mode of equivalence, within being included in protection domain of the present utility model.
Claims (8)
1. an audio amplitude limiting circuit, it is characterised in that including:
Sample circuit, amplifying circuit, rectification circuit, delay adjustment circuit and photoconductive resistance；Described sample circuit one ending connecting audio inputs, and the other end is connected with amplifying circuit and photoconductive resistance respectively；One end of described amplifying circuit connects sample circuit, and the other end is connected with one end of rectification circuit；The other end of described rectification circuit is connected with one end of delay adjustment circuit；The other end of described delay adjustment circuit is connected with photoconductive resistance.
2. audio amplitude limiting circuit as claimed in claim 1, it is characterised in that: described sample circuit, comprise the partial ohmic limit of resistance R1 and photoconductive resistance, resistance R1 mono-ending connecting audio inputs, and the other end connects photoconductive resistance and amplifying circuit.
3. audio amplitude limiting circuit as claimed in claim 2, it is characterised in that: described amplifying circuit, comprise resistance R4, R5, R6, electric capacity C2, operational amplifier U1-B, the 5th foot of operational amplifier U1-B is connected to R1 and photoconductive resistance；6th foot of operational amplifier U1-B is connected to resistance R4, R5, R6；7th foot of operational amplifier U1-B is connected to electric capacity C2, resistance R6 and rectification circuit；Electric capacity C2 connects with resistance R5, the series circuit one terminating resistor R6 of C2 Yu R5 and the 6th foot of operational amplifier U1-B, and the other end is connected to the other end of resistance R6 and the 7th foot of operational amplifier U1-B；Resistance R6 mono-terminates the 7th foot and the rectification circuit of operational amplifier U1-B, the 6th foot of another termination operational amplifier U1-B；Resistance R4 mono-terminates the 6th foot of operational amplifier U1-B, other end ground connection.
4. audio amplitude limiting circuit as claimed in claim 1, it is characterized in that: described rectification circuit, comprising diode D1, D2, D3, D4, the positive pole of diode D1 connects the negative pole of D2 and the 7th foot of operational amplifier U1-B, and the negative pole of D1 connects negative pole and the delay adjustment circuit of D3；The positive pole of diode D2 connects the positive pole of D4 and delay adjustment circuit and photoconductive resistance, and the negative pole of D2 connects the positive pole of D1 and the 7th foot of operational amplifier U1-B；The plus earth of diode D3, negative pole connects negative pole and the delay adjustment circuit of D1；The positive pole of diode D4 connects the positive pole of D2 and delay adjustment circuit and photoconductive resistance, minus earth.
5. audio amplitude limiting circuit as claimed in claim 4, it is characterized in that: described delay adjustment circuit, comprise resistance R7, R8, R9 and electrochemical capacitor C1, the negative pole of termination D3 and D1 of resistance R7, one end of the other end connecting resistance R8, R9 and the positive pole of electrochemical capacitor C1；Resistance R8 is in parallel with electrochemical capacitor C1, terminating resistor R7, a R9, the positive pole of another terminating diode D2, D4 and photoconductive resistance；Terminating resistor R7, R8 of resistance R9 and the positive pole of electrochemical capacitor C1, another terminates photoconductive resistance.
6. audio amplitude limiting circuit as claimed in claim 4, it is characterised in that: described photoconductive resistance, comprise resistance and a LED, one end of the 1st foot connecting resistance R9 of photoconductive resistance OPT1 that light reception intensity controls；2nd foot connects the positive pole of diode D2, D4, one end of resistance R8 and the negative pole of electrochemical capacitor C1；3rd foot ground connection；One end of 4th foot connecting resistance R1, the 3rd foot of operational amplifier U1-A and the 5th foot of operational amplifier U1-B；Described 3rd foot and the 4th foot are in sample circuit.
7. audio amplitude limiting circuit as claimed in claim 1, it is characterised in that: described audio amplitude limiting circuit can also include that impedance matching circuit, described impedance matching circuit one end connect sample circuit and amplifying circuit, and another terminates audio output apparatus.
8. audio amplitude limiting circuit as claimed in claim 7, it is characterised in that: described impedance matching circuit, comprise operational amplifier U1-A and resistance R2, R3；One end of the 1st foot connecting resistance R2 of described operational amplifier U1-A and audio output apparatus；2nd foot connecting resistance R2 and R3 of operational amplifier U1-A；3rd foot connecting resistance R1, the 4th foot of photoconductive resistance and the 5th foot of operational amplifier U1-B of operational amplifier U1-A；First foot of the one termination operational amplifier U1-A of resistance R2 and audio output apparatus, the 2nd foot of another termination operational amplifier U1-A and one end of resistance R3；2nd foot of the one termination operational amplifier U1-A of resistance R3, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620030349.4U CN205491092U (en) | 2016-01-13 | 2016-01-13 | Audio frequency limit circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620030349.4U CN205491092U (en) | 2016-01-13 | 2016-01-13 | Audio frequency limit circuit |
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| CN205491092U true CN205491092U (en) | 2016-08-17 |
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| CN201620030349.4U Active CN205491092U (en) | 2016-01-13 | 2016-01-13 | Audio frequency limit circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2016
- 2016-01-13 CN CN201620030349.4U patent/CN205491092U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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