CN116032232A - Automatic amplitude limiting circuit of voltage tracking audio frequency - Google Patents
Automatic amplitude limiting circuit of voltage tracking audio frequency Download PDFInfo
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- CN116032232A CN116032232A CN202310122774.0A CN202310122774A CN116032232A CN 116032232 A CN116032232 A CN 116032232A CN 202310122774 A CN202310122774 A CN 202310122774A CN 116032232 A CN116032232 A CN 116032232A
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Abstract
The invention discloses a voltage tracking audio automatic amplitude limiting circuit, which comprises: the voltage comparison circuit module is used for detecting the rising and falling change of the input voltage, comparing the input voltage with a reference voltage and outputting a voltage difference; the voltage tracking circuit module is used for tracking the voltage output by the voltage comparison circuit module and adjusting the conduction quantity of the optocoupler; and the audio amplitude limiting circuit module is used for carrying out real-time amplitude limiting on the input audio signal according to the optocoupler flux output by the voltage tracking circuit module. The invention can realize that the gain of the circuit can be changed along with the intensity of the input signal; when a weak signal is input, the gain of the circuit is high; when a strong signal is input, the gain of the circuit is low, so that the influence of the strong and weak change of the input signal on the output signal is reduced, and the function of normally amplifying the input signal with larger amplitude difference is realized.
Description
Technical Field
The invention relates to a limiting circuit, in particular to a voltage tracking audio automatic limiting circuit.
Background
The audio signal is a frequency, amplitude varying information carrier of regular sound waves with speech, music and sound effects. Since the fluctuation of the audio signal is large, and the output amplitude difference of different audio signal sources is also large. During the reception of an audio signal, if an input signal having a large amplitude is received, the output audio signal may be distorted or even the speaker may be damaged. Therefore, it is desirable that the gain of the amplifying circuit can be changed depending on the intensity of the input signal when the circuit is designed, that is, when the weak signal is input, the gain of the amplifying circuit is high; when a strong signal is input, the gain of the amplifying circuit is low, so that the influence of the strength of the input signal is reduced, and the function of normal amplification of the input signal with larger amplitude difference is achieved. Meanwhile, the amplified signal can keep low distortion.
In view of this, the present application is specifically proposed.
Disclosure of Invention
The invention provides a voltage tracking audio automatic limiting circuit, which solves the problem that the output audio signal is distorted due to the fact that the fluctuation of the audio input signal is large when the audio input signal is processed by the existing amplifying circuit.
The invention is realized by the following technical scheme:
the voltage tracking audio automatic limiting circuit comprises: the voltage comparison circuit module is used for detecting the rising and falling change of the input voltage, comparing the input voltage with a reference voltage and outputting a voltage difference; the voltage tracking circuit module is used for tracking the voltage output by the voltage comparison circuit module and adjusting the conduction quantity of the optocoupler; the audio amplitude limiting circuit module is used for carrying out real-time amplitude limiting on the input audio signal according to the optocoupler flux output by the voltage tracking circuit module; the signal amplifying circuit module is used for amplifying the limited audio signals output by the audio limiting circuit module and driving the loudspeaker to sound; and the power supply circuit module is used for supplying power to the voltage comparison circuit module, the voltage tracking circuit module and the audio amplitude limiting circuit module.
Wherein the voltage comparison circuit module includes: the voltage change detection circuit unit is used for detecting the rising and falling change of the input voltage, outputting the changed voltage to the voltage comparison circuit unit along with the rising and falling change of the input voltage; a reference voltage input circuit unit for providing a base reference voltage to the voltage comparison circuit unit; and the voltage comparison circuit unit is used for comparing the voltage output by the voltage change detection circuit unit with a base reference voltage and outputting different voltage differences to the voltage tracking circuit module according to the rising and falling conditions of the input voltage.
Compared with the prior art, the invention has the following advantages and beneficial effects: by detecting, comparing and tracking the rise and fall change of the input voltage and carrying out real-time amplitude limiting on the input audio signal according to the optical coupling flux, the gain of the circuit can be changed along with the intensity of the input signal. When a weak signal is input, the gain of the circuit is high; when a strong signal is input, the gain of the circuit is low, so that the influence of the change of the intensity of the input signal on the output signal is reduced, the function of normally amplifying the input signal with larger amplitude difference is realized, and the amplified signal can keep lower distortion.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an overall structure of a voltage tracking audio automatic limiting circuit according to an embodiment of the present invention
Fig. 2 is a schematic diagram of a voltage comparison circuit module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a voltage tracking circuit module according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an audio clipping circuit module according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a signal amplifying circuit module according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a power supply circuit module according to an embodiment of the present invention.
In the drawings, the reference numerals and corresponding part names:
the circuit comprises a 1-voltage comparison circuit module, a 2-voltage tracking circuit module, a 3-audio amplitude limiting circuit module, a 4-signal amplifying circuit module, a 5-power supply circuit module, an 11-voltage change detection circuit unit, a 12-reference voltage input circuit unit, a 13-voltage comparison circuit unit, a 31-primary amplifying circuit unit, a 32-secondary amplifying circuit unit, a 131-first comparing circuit subunit and a 132-second comparing circuit subunit.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Examples
The embodiment provides a voltage tracking audio automatic limiting circuit, the circuit structure of which is shown in fig. 1, and the circuit structure comprises a voltage comparison circuit module 1, a voltage tracking circuit module 2, an audio limiting circuit module 3, a signal amplifying circuit module 4 and a power supply circuit module 5. The voltage comparison circuit module 1 is used for detecting the rising and falling change of the input voltage, comparing the input voltage with a reference voltage and outputting a voltage difference; the voltage tracking circuit module 2 is used for tracking the voltage output by the voltage comparison circuit module 1 and adjusting the conduction quantity of the optocoupler; the audio amplitude limiting circuit module 3 is used for carrying out real-time amplitude limiting on an input audio signal according to the optocoupler flux output by the voltage tracking circuit module 2; the signal amplifying circuit module 4 is used for amplifying the limited audio signal output by the audio limiting circuit module 3 and driving the loudspeaker to sound; the power supply circuit module 5 is used for supplying power to the voltage comparison circuit module 1, the voltage tracking circuit module 2 and the audio clipping circuit module 3.
The circuit structure of the voltage comparison circuit module is shown in fig. 2, and includes a voltage change detection circuit unit 11, a reference voltage input circuit unit 12, and a voltage comparison circuit unit 13. The voltage change detection circuit unit 11 is configured to detect a rise and fall change of an input voltage, and output the changed voltage to the voltage comparison circuit unit 13 along with the rise and fall change of the input voltage; the reference voltage input circuit unit 12 is configured to provide a base reference voltage to the voltage comparison circuit unit 13; the voltage comparing circuit unit 13 is configured to compare the voltage output by the voltage change detecting circuit unit 11 with a reference voltage, and output different voltage differences to the voltage tracking circuit module according to the rising and falling conditions of the input voltage.
The specific circuit configuration of each of the above-described circuit units is described in detail below.
The voltage change detection circuit unit 11 includes a voltage follower U1A, a resistor R17, a resistor R4, and a capacitor C3; one end of a resistor R17 is connected with PVCC voltage, and the other end of the resistor R17 is connected with the positive input end of a voltage follower U1A; the resistor R4 is connected with the capacitor C3 in parallel, one end of the resistor R4 and one end of the capacitor C3 are both connected with the positive input end of the voltage follower U1A, and the other end of the resistor R4 and the other end of the capacitor C3 are both grounded; the inverting input terminal of the voltage follower U1A is interconnected with the output terminal of the voltage follower U1A, and the output terminal of the voltage follower U1A is connected to the input terminal of the reference voltage input circuit unit 12.
The reference voltage input circuit unit 12 includes an operational amplifier U1C, a resistor R3, a resistor R5, and a capacitor C4. One end of a resistor R3 is connected with 12V stable voltage, and the other end of the resistor R3 is connected with the positive input end of an operational amplifier U1C; the resistor R5 is connected with the capacitor C4 in parallel, one end of the resistor R5 and one end of the capacitor C4 are both connected with the positive input end of the operational amplifier U1C, and the other end of the resistor R5 and the other end of the capacitor C4 are both grounded; the inverting input terminal of the operational amplifier U1C is interconnected with the output terminal of the operational amplifier U1C, and the output terminal of the operational amplifier U1C is connected to the input terminal of the reference voltage input circuit unit 12.
The voltage comparison circuit unit 13 includes a first comparison circuit sub-unit 131 and a second comparison circuit sub-unit 132. The comparison circuit subunit comprises an operational amplifier U1B, a resistor R6, a resistor R7, a resistor R1, a resistor R2, a resistor R12 and a capacitor C1. The two comparison circuit sub-units comprise an operational amplifier U1D, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R13 and a capacitor C2.
One end of a resistor R6 is connected with the output end of the voltage follower U1A, and the other end of the resistor R6 is connected with the positive input end of the operational amplifier U1B; one end of the resistor R8 is connected with the output end of the operational amplifier U1C, and the other end of the resistor R8 is connected with the positive input end of the operational amplifier U1D; one end of a resistor R7 is connected between the resistor R6 and the positive input end of the operational amplifier U1B, and the other end of the resistor R7 is connected between the output end of the operational amplifier U1C and the resistor R8; the resistor R2 is connected in parallel with the capacitor C1, the resistor R2 is connected across the inverting input end of the operational amplifier U1B and the output end of the operational amplifier U1B, and the capacitor C1 is connected across the inverting input end of the operational amplifier U1B and the output end of the operational amplifier U1B; the output end of the operational amplifier U1B is connected with the input end of the voltage tracking circuit module; the resistor R11 is connected in parallel with the capacitor C2, the resistor R11 is connected across the inverting input end of the operational amplifier U1D and the output end of the operational amplifier U1D, and the capacitor C2 is connected across the inverting input end of the operational amplifier U1D and the output end of the operational amplifier U1D; the output end of the operational amplifier U1D is connected with the input end of the voltage tracking circuit module; one end of the resistor R1 is grounded, and the other end of the resistor R1 is connected with the reverse input end of the operational amplifier U1B; one end of a resistor R9 is connected between the output end of the voltage follower U1A and a resistor R6, and the other end of the resistor R9 is connected with the reverse input end of the operational amplifier U1D; one end of the resistor R10 is grounded, and the other end of the resistor R10 is connected between the resistor R8 and the positive input end of the operational amplifier U1D; one end of the resistor R12 is grounded, and the other end of the resistor R12 is connected between the output end of the operational amplifier U1B and the input end of the voltage tracking circuit module 2; one end of the resistor R13 is grounded, and the other end of the resistor R13 is connected between the output end of the operational amplifier U1D and the input end of the voltage tracking circuit module.
The circuit structure of the voltage tracking circuit module is shown in fig. 3, and includes an operational amplifier U2A, an operational amplifier U2B, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a laser diode LD1, a laser diode LD2, a capacitor C6, a capacitor C7, a capacitor C8, and a voltage comparator OP1, where the laser diode LD2 and the voltage comparator OP1 form a photoresistor.
The positive input end of the operational amplifier U2A is connected with the output end of the operational amplifier U1B, the negative input end of the operational amplifier U2A is connected with the positive input end of the operational amplifier U2B, the negative input end of the operational amplifier U2B is connected with the output end of the operational amplifier U1D, and the output end of the operational amplifier U2A is connected with the output end of the operational amplifier U1B; the output end of the operational amplifier U2A is connected with one end of a resistor R19, the other end of the resistor R19 is connected with the cathode of the laser diode LD1, the anode of the laser diode LD1 is connected with one end of a capacitor C8, and the other end of the capacitor C8 is grounded; one end of the capacitor C6 is grounded, the other end of the capacitor C6 is connected with one end of the capacitor C7, the other end of the capacitor C7 is connected with the anode of the laser diode LD2, and the cathode of the laser diode LD2 is connected between the capacitor C6 and the capacitor C7; the output end of the operational amplifier U2B is connected with one end of a resistor R20, and the other end of the resistor R20 is connected between a capacitor C6 and a capacitor C7; one end of the voltage comparator OP1 is connected with the audio amplitude limiting circuit module, the other end of the voltage comparator OP1 is connected with one end of the resistor R21, and the other end of the resistor R21 is connected with the audio amplitude limiting circuit module; one end of a resistor R18 is connected between the reverse input end of the operational amplifier U2A and the positive input end of the operational amplifier U2B, and the other end of the resistor R18 is connected between a resistor R21 and the audio amplitude limiting circuit module; 12V voltage is connected between the anode of the laser diode LD1 and the capacitor C8 and between the capacitor C7 and the anode of the laser diode LD 2.
The circuit structure of the audio clipping circuit module is shown in fig. 4, and includes a BNC interface P1, a primary amplifying circuit unit 31, a secondary amplifying circuit unit 32 and a capacitor C13; the BNC interface P1, the primary amplifying circuit unit 31, the secondary amplifying circuit unit 32, and the capacitor C13 are sequentially connected.
The first-stage amplifying circuit unit 31 includes an operational amplifier U3A, a capacitor C11, a capacitor C14, a resistor R22, a resistor R23, and a resistor R14.
One end of the capacitor C11 is connected with the BNC interface P1, the other end of the capacitor C11 is connected with one end of the resistor R22, and the other end of the resistor R22 is connected with the reverse input end of the operational amplifier U3A; the positive input end of the operational amplifier U3A is connected with one end of a resistor R14, the other end of the resistor R14 is connected with a reference voltage, and the output end of the operational amplifier U3A is connected with the secondary amplifying circuit unit 32; the resistor R23 is connected in parallel with the capacitor C14, the resistor R23 is connected across the inverting input end of the operational amplifier U3A and the output end of the operational amplifier U3A, and the capacitor C14 is connected across the inverting input end of the operational amplifier U3A and the output end of the operational amplifier U3A.
The secondary amplifying circuit unit 32 includes a capacitor C12, a capacitor C15, a capacitor C10, a resistor R24, a resistor R25, a resistor R16, and a resistor R15.
One end of the capacitor C12 is connected with the output end of the operational amplifier U3A, the other end of the capacitor C12 is connected with one end of the resistor R24, and the other end of the resistor R24 is connected with the reverse input end of the operational amplifier U3B; one end of the resistor R15 is connected with 12V voltage, the other end of the resistor R15 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is grounded; the positive input end of the operational amplifier U3B is connected with one end of a resistor R16, the other end of the resistor R16 is connected between a resistor R15 and a capacitor C10, and a reference voltage is connected between the resistor R15 and the capacitor C10; the output end of the operational amplifier U3B is connected with one end of a capacitor C13, and the other end of the capacitor C13 is connected with the signal amplifying circuit module; the resistor R25 is connected in parallel with the capacitor C15, the resistor R25 is connected across the inverting input end of the operational amplifier U3B and the output end of the operational amplifier U3B, and the capacitor C15 is connected across the inverting input end of the operational amplifier U3B and the output end of the operational amplifier U3B; one end of the voltage comparator OP1 is connected with the reverse input end of the operational amplifier U3B, and the other end of the voltage comparator OP1 is connected with the output end of the operational amplifier U3B after being connected with the resistor R21 in series.
The circuit configuration of the signal amplifying circuit module is shown in fig. 5, and includes a volume regulator VOL, an operational amplifier U4, a resistor R26, a capacitor E1, a capacitor C16, and a speaker SP1.
One end of the volume regulator VOL is connected with a capacitor C13; the positive input end of the operational amplifier U4 is connected with the volume regulator VOL, the negative input end of the operational amplifier U4 is connected with the fourth pin of the operational amplifier U4, the negative input end of the operational amplifier U4 is connected with one end of the capacitor C16, the other end of the capacitor C16 is connected with the seventh pin of the operational amplifier U4, the output end of the operational amplifier U4 is connected with one end of the capacitor E1, and the other end of the capacitor E1 is connected with the loudspeaker SP1; the inverting input end of the operational amplifier U4 is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with one end of a resistor R26, and the other end of the resistor R26 is connected between the output end of the operational amplifier U4 and a capacitor E1; resistor R26 is connected in series with capacitor C5 and then connected to ground.
The circuit structure of the power supply circuit module is shown in fig. 6, and includes an operational amplifier U1E, an operational amplifier U2C, an operational amplifier U3C, and a capacitor C9. One end of the operational amplifier U1E, the operational amplifier U2C, the operational amplifier U3C and the capacitor C9 which are connected in parallel is connected with 12V voltage, and the other end is grounded.
The voltage tracking audio automatic amplitude limiting circuit with the structure provided by the embodiment has the following working principle:
referring to fig. 2, the pvcc voltage is input to a voltage comparison circuit module, and after attenuation conditioning is performed by the electrons R17 and R14 in the voltage change detection circuit unit 11, filtering processing is performed by the capacitor C3; the processed voltage is output to the positive input end of the voltage follower U1A; the voltage follower U1A outputs the processed voltages to the positive input end of the operational amplifier U1B and the negative input end of the operational amplifier U1D respectively for accurate comparison. On the other hand, the 12V voltage is input to the voltage comparing circuit module, processed by the reference voltage input circuit unit 12, and then output to the positive input terminal of the operational amplifier U1B and the positive input terminal of the operational amplifier U1D, respectively. When the PVCC voltage drops or rises, the voltage follower U1A detects a voltage change, and compares the voltage change with the voltage comparison circuit unit 13 including the operational amplifiers U1B and U1D, and the voltage difference between vref_hi and vref_lo is different after the comparison.
Referring to fig. 3, in the voltage tracking circuit module, the voltage output by vref_hi is input to the positive input terminal of the operational amplifier U2A, the voltage output by vref_lo is input to the negative input terminal of the operational amplifier U2B, and the voltage is tracked to adjust the conduction flux of the optocoupler. The laser diode LD1 and the resistor R9 form an optocoupler limiting indicator lamp, and the working state of the optocoupler can be intuitively observed through the brightness of the optocoupler limiting indicator lamp.
Referring to fig. 4, in the audio clipping circuit module, the audio signal input by the BNC interface P1 is reversely amplified by the operational amplifier U3A and then output to the direction input end of the operational amplifier U3B, and the amplification factor of the operational amplifier U3B is changed by the linear change of the optocoupler, so that real-time clipping is performed on the audio signal, and the output audio signal is in a constant range without distortion. The voltage of the audio signal input by the BNC interface P1 can be 200 mV-4V, and the output of the audio signal is kept constant and undistorted after the amplitude limiting treatment of the operational amplifier U3B, so that the purpose of protecting the loudspeaker from damage is achieved.
In summary, the gain of the voltage tracking audio automatic limiting circuit provided in the embodiment may vary with the intensity of the input signal. Namely, when a weak signal is input, the gain of the circuit is high; when the input signal is strong, the gain of the circuit is low, so that the influence of the intensity of the input signal can be reduced, the function of normally amplifying the input signal with larger amplitude difference can be realized, and the amplified signal can keep lower distortion degree.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. An automatic voltage tracking audio limiting circuit, comprising
The voltage comparison circuit module (1) is used for detecting the rising and falling change of the input voltage, comparing the input voltage with a reference voltage and outputting a voltage difference;
the voltage tracking circuit module (2) is used for tracking the voltage output by the voltage comparison circuit module (1) and adjusting the conduction quantity of the optocoupler;
and the audio amplitude limiting circuit module (3) is used for carrying out real-time amplitude limiting on the input audio signal according to the optocoupler flux output by the voltage tracking circuit module (2).
2. The voltage tracking audio auto-limiting circuit of claim 1, further comprising
The signal amplifying circuit module (4) is used for amplifying the limited audio signal output by the audio limiting circuit module (3) and driving the loudspeaker to sound;
and the power supply circuit module (5) is used for supplying power to the voltage comparison circuit module (1), the voltage tracking circuit module (2) and the audio amplitude limiting circuit module (3).
3. A voltage tracking audio auto-clipping circuit according to claim 2, characterized in that the voltage comparison circuit module (1) comprises
A voltage change detection circuit unit (11) for detecting a rise-fall change of the input voltage, and outputting the changed voltage to a voltage comparison circuit unit (13) following the rise-fall change of the input voltage;
a reference voltage input circuit unit (12) for providing a base reference voltage to the voltage comparison circuit unit (13);
the voltage comparison circuit unit (13) is used for comparing the voltage output by the voltage change detection circuit unit (11) with a base reference voltage and outputting different voltage differences to the voltage tracking circuit module (2) according to the rising and falling conditions of the input voltage.
4. A voltage tracking audio auto-clip circuit according to claim 3, characterized in that the voltage change detection circuit unit (11) comprises a voltage follower U1A, a resistor R17, a resistor R4 and a capacitor C3;
one end of a resistor R17 is connected with PVCC voltage, and the other end of the resistor R17 is connected with the positive input end of a voltage follower U1A; the resistor R4 is connected with the capacitor C3 in parallel, one end of the resistor R4 and one end of the capacitor C3 are both connected with the positive input end of the voltage follower U1A, and the other end of the resistor R4 and the other end of the capacitor C3 are both grounded; the reverse input end of the voltage follower U1A is interconnected with the output end of the voltage follower U1A, and the output end of the voltage follower U1A is connected with the input end of the reference voltage input circuit unit (12).
5. The voltage tracking audio auto-clipping circuit according to claim 4, characterized in that the reference voltage input circuit unit (12) comprises an operational amplifier U1C, a resistor R3, a resistor R5 and a capacitor C4;
one end of a resistor R3 is connected with 12V stable voltage, and the other end of the resistor R3 is connected with the positive input end of an operational amplifier U1C; the resistor R5 is connected with the capacitor C4 in parallel, one end of the resistor R5 and one end of the capacitor C4 are both connected with the positive input end of the operational amplifier U1C, and the other end of the resistor R5 and the other end of the capacitor C4 are both grounded; the inverting input terminal of the operational amplifier U1C is interconnected with the output terminal of the operational amplifier U1C, and the output terminal of the operational amplifier U1C is connected with the input terminal of the reference voltage input circuit unit (12).
6. The voltage tracking audio auto-clipping circuit according to claim 5, characterized in that the voltage comparison circuit unit (13) comprises a first comparison circuit subunit (131) and a second comparison circuit subunit (132);
the first comparison circuit subunit (131) comprises an operational amplifier U1B, a resistor R6, a resistor R7, a resistor R1, a resistor R2, a resistor R12 and a capacitor C1; the second comparison circuit subunit (132) comprises an operational amplifier U1D, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R13 and a capacitor C2;
one end of a resistor R6 is connected with the output end of the voltage follower U1A, and the other end of the resistor R6 is connected with the positive input end of the operational amplifier U1B; one end of the resistor R8 is connected with the output end of the operational amplifier U1C, and the other end of the resistor R8 is connected with the positive input end of the operational amplifier U1D; one end of a resistor R7 is connected between the resistor R6 and the positive input end of the operational amplifier U1B, and the other end of the resistor R7 is connected between the output end of the operational amplifier U1C and the resistor R8; the resistor R2 is connected in parallel with the capacitor C1, the resistor R2 is connected across the inverting input end of the operational amplifier U1B and the output end of the operational amplifier U1B, and the capacitor C1 is connected across the inverting input end of the operational amplifier U1B and the output end of the operational amplifier U1B; the output end of the operational amplifier U1B is connected with the input end of the voltage tracking circuit module (2); the resistor R11 is connected in parallel with the capacitor C2, the resistor R11 is connected across the inverting input end of the operational amplifier U1D and the output end of the operational amplifier U1D, and the capacitor C2 is connected across the inverting input end of the operational amplifier U1D and the output end of the operational amplifier U1D; the output end of the operational amplifier U1D is connected with the input end of the voltage tracking circuit module (2); one end of the resistor R1 is grounded, and the other end of the resistor R1 is connected with the reverse input end of the operational amplifier U1B; one end of a resistor R9 is connected between the output end of the voltage follower U1A and a resistor R6, and the other end of the resistor R9 is connected with the reverse input end of the operational amplifier U1D; one end of the resistor R10 is grounded, and the other end of the resistor R10 is connected between the resistor R8 and the positive input end of the operational amplifier U1D; one end of the resistor R12 is grounded, and the other end of the resistor R12 is connected between the output end of the operational amplifier U1B and the input end of the voltage tracking circuit module (2); one end of the resistor R13 is grounded, and the other end of the resistor R13 is connected between the output end of the operational amplifier U1D and the input end of the voltage tracking circuit module (2).
7. The automatic voltage tracking audio limiter circuit of claim 6 wherein the voltage tracking circuit module (2) includes an operational amplifier U2A, an operational amplifier U2B, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a laser diode LD1, a laser diode LD2, a capacitor C6, a capacitor C7, a capacitor C8, and a voltage comparator OP1, the laser diode LD2 and the voltage comparator OP1 forming a photo resistor;
the positive input end of the operational amplifier U2A is connected with the output end of the operational amplifier U1B, the negative input end of the operational amplifier U2A is connected with the positive input end of the operational amplifier U2B, the negative input end of the operational amplifier U2B is connected with the output end of the operational amplifier U1D, and the output end of the operational amplifier U2A is connected with the output end of the operational amplifier U1B; the output end of the operational amplifier U2A is connected with one end of a resistor R19, the other end of the resistor R19 is connected with the cathode of the laser diode LD1, the anode of the laser diode LD1 is connected with one end of a capacitor C8, and the other end of the capacitor C8 is grounded; one end of the capacitor C6 is grounded, the other end of the capacitor C6 is connected with one end of the capacitor C7, the other end of the capacitor C7 is connected with the anode of the laser diode LD2, and the cathode of the laser diode LD2 is connected between the capacitor C6 and the capacitor C7; the output end of the operational amplifier U2B is connected with one end of a resistor R20, and the other end of the resistor R20 is connected between a capacitor C6 and a capacitor C7; one end of the voltage comparator OP1 is connected with the audio amplitude limiting circuit module (3), the other end of the voltage comparator OP1 is connected with one end of the resistor R21, and the other end of the resistor R21 is connected with the audio amplitude limiting circuit module (3); one end of a resistor R18 is connected between the reverse input end of the operational amplifier U2A and the positive input end of the operational amplifier U2B, and the other end of the resistor R18 is connected between a resistor R21 and the audio amplitude limiting circuit module (3); 12V voltage is connected between the anode of the laser diode LD1 and the capacitor C8 and between the capacitor C7 and the anode of the laser diode LD 2.
8. The voltage tracking audio auto-clip circuit according to claim 7, wherein the audio clip circuit module (3) comprises a BNC interface P1, a primary amplifying circuit unit (31), a secondary amplifying circuit unit (32) and a capacitor C13; BNC interface P1, primary amplifying circuit unit (31), secondary amplifying circuit unit (32) and capacitor C13 are connected in sequence;
the primary amplifying circuit unit (31) comprises an operational amplifier U3A, a capacitor C11, a capacitor C14, a resistor R22, a resistor R23 and a resistor R14; one end of the capacitor C11 is connected with the BNC interface P1, the other end of the capacitor C11 is connected with one end of the resistor R22, and the other end of the resistor R22 is connected with the reverse input end of the operational amplifier U3A; the positive input end of the operational amplifier U3A is connected with one end of a resistor R14, the other end of the resistor R14 is connected with reference voltage, and the output end of the operational amplifier U3A is connected with the secondary amplifying circuit unit (32); the resistor R23 is connected in parallel with the capacitor C14, the resistor R23 is connected across the inverting input end of the operational amplifier U3A and the output end of the operational amplifier U3A, and the capacitor C14 is connected across the inverting input end of the operational amplifier U3A and the output end of the operational amplifier U3A;
the secondary amplifying circuit unit (32) comprises a capacitor C12, a capacitor C15, a capacitor C10, a resistor R24, a resistor R25, a resistor R16 and a resistor R15; one end of the capacitor C12 is connected with the output end of the operational amplifier U3A, the other end of the capacitor C12 is connected with one end of the resistor R24, and the other end of the resistor R24 is connected with the reverse input end of the operational amplifier U3B; one end of the resistor R15 is connected with 12V voltage, the other end of the resistor R15 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is grounded; the positive input end of the operational amplifier U3B is connected with one end of a resistor R16, the other end of the resistor R16 is connected between a resistor R15 and a capacitor C10, and a reference voltage is connected between the resistor R15 and the capacitor C10; the output end of the operational amplifier U3B is connected with one end of a capacitor C13, and the other end of the capacitor C13 is connected with the signal amplifying circuit module (4); the resistor R25 is connected in parallel with the capacitor C15, the resistor R25 is connected across the inverting input end of the operational amplifier U3B and the output end of the operational amplifier U3B, and the capacitor C15 is connected across the inverting input end of the operational amplifier U3B and the output end of the operational amplifier U3B; one end of the voltage comparator OP1 is connected with the reverse input end of the operational amplifier U3B, and the other end of the voltage comparator OP1 is connected with the output end of the operational amplifier U3B after being connected with the resistor R21 in series.
9. The automatic voltage tracking audio limiter circuit of claim 8 wherein the signal amplifying circuit module (4) includes a volume regulator VOL, an operational amplifier U4, a resistor R26, a capacitor E1, a capacitor C16, and a speaker SP1;
one end of the volume regulator VOL is connected with a capacitor C13; the positive input end of the operational amplifier U4 is connected with the volume regulator VOL, the negative input end of the operational amplifier U4 is connected with the fourth pin of the operational amplifier U4, the negative input end of the operational amplifier U4 is connected with one end of the capacitor C16, the other end of the capacitor C16 is connected with the seventh pin of the operational amplifier U4, the output end of the operational amplifier U4 is connected with one end of the capacitor E1, and the other end of the capacitor E1 is connected with the loudspeaker SP1; the inverting input end of the operational amplifier U4 is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with one end of a resistor R26, and the other end of the resistor R26 is connected between the output end of the operational amplifier U4 and a capacitor E1; resistor R26 is connected in series with capacitor C5 and then connected to ground.
10. A voltage tracking audio auto-clip circuit according to any of claims 1-9, characterized in that the power supply circuit module (5) comprises an operational amplifier U1E, an operational amplifier U2C, an operational amplifier U3C and a capacitor C9; one end of the operational amplifier U1E, the operational amplifier U2C, the operational amplifier U3C and the capacitor C9 which are connected in parallel is connected with 12V voltage, and the other end is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310122774.0A CN116032232A (en) | 2023-02-16 | 2023-02-16 | Automatic amplitude limiting circuit of voltage tracking audio frequency |
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| CN202310122774.0A CN116032232A (en) | 2023-02-16 | 2023-02-16 | Automatic amplitude limiting circuit of voltage tracking audio frequency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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