CN210629837U - Audio control circuit and equipment - Google Patents
Audio control circuit and equipment Download PDFInfo
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- CN210629837U CN210629837U CN201922312227.0U CN201922312227U CN210629837U CN 210629837 U CN210629837 U CN 210629837U CN 201922312227 U CN201922312227 U CN 201922312227U CN 210629837 U CN210629837 U CN 210629837U
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Abstract
The utility model relates to the technical field of audio playing, in particular to an audio control circuit and audio control equipment, which comprises a high-low frequency band adjusting module, a power amplifying module and a noise eliminating module, wherein an audio signal is respectively input into the power amplifying module and the noise eliminating module after passing through the high-low frequency band adjusting module, and the output end of the noise eliminating module is electrically connected with the output control end of the power amplifying module; the noise elimination module comprises a signal amplification module and a signal comparison module. The utility model provides a pair of audio control circuit and equipment, noise when the audio frequency is in lower volume eliminates through the noise elimination module, when power amplification module has audio signal output, handles audio signal's that the volume is low high frequency and low frequency signal via high low band adjusting module, guarantees that people can obtain abundant high frequency signal and low frequency signal.
Description
Technical Field
The utility model belongs to the technical field of the audio playback technique and specifically relates to indicate an audio control circuit and equipment.
Background
In the prior art, the requirement on the cleanness of a signal is high, and in the process of audio playing, noise of the audio signal is eliminated usually by adding a circuit structure for eliminating noise, but when the volume is low, even no fine noise is generated when the audio signal is output, the noise cannot be eliminated well, and when the noise with low volume is not eliminated, the audio signal at high frequency and low frequency is influenced, so that people cannot obtain rich high-frequency sound and low-frequency sound.
Disclosure of Invention
The utility model discloses problem to prior art provides an audio control circuit and equipment, and noise when the audio frequency is in lower volume eliminates through the noise elimination module, when power amplification module has audio signal output, handles audio signal's that the volume is low high frequency and low frequency signal via high low frequency section adjusting module, guarantees that people can obtain abundant high frequency signal and low frequency signal.
In order to solve the technical problem, the utility model discloses a following technical scheme: an audio control circuit comprises a high-low frequency band adjusting module, a power amplifying module and a noise eliminating module, wherein an audio signal passes through the high-low frequency band adjusting module and then is respectively input into the power amplifying module and the noise eliminating module, and the output end of the noise eliminating module is electrically connected with the output control end of the power amplifying module; the high-low frequency band adjusting module comprises a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1 and an adjustable potentiometer RP1, wherein a first fixed end of the adjustable potentiometer RP1 is electrically connected with one end of the capacitor C1, a second fixed end of the adjustable potentiometer RP1 is grounded, the other end of the capacitor C1 is electrically connected with one end of the capacitor C2, the other end of the capacitor C2 is electrically connected with the resistor R1, the other end of the resistor R1 is grounded, taps of the adjustable potentiometer RP1 are respectively electrically connected with the capacitor C1 and the capacitor C2, and an adjusting end of the adjustable resistor RP1 is connected with an input end of the power amplifying module; the noise elimination module comprises a signal amplification module and a signal comparison module, the signal amplification module is used for amplifying the output signals of the high-low frequency band adjustment module, and the signal comparison module is used for receiving the signals amplified by the signal amplification module and outputting control signals to the output control end of the power amplification module according to the signals.
Preferably, the signal amplification module comprises a first-stage amplification unit and a second-stage amplification unit, the output end of the first-stage amplification unit is connected with the input end of the second-stage amplification unit, the input end of the first-stage amplification unit is connected with the output end of the high-low frequency band adjustment module, and the output end of the second-stage amplification unit is connected with the input end of the signal comparison module.
Preferably, the primary amplification unit comprises a transistor Q1, a capacitor C12, a resistor R9, a resistor R7 and a resistor R8, and the secondary amplification unit comprises a transistor Q2 and a resistor R10; the output signal of the high-low frequency band adjusting module is input into the base of a triode Q1 through a capacitor C12, the base of the triode Q1 is grounded after sequentially passing through a resistor R7 and a resistor R8, the collector of the triode Q1 is connected with the base of a triode Q2, the emitter of the triode Q2 is grounded after passing through a resistor R8, the collector of the triode Q2 is an amplified signal output end, the resistor R9 is a pull-up resistor of the collector of the triode Q1, and the resistor R10 is a pull-up resistor of the collector of the triode Q2.
Preferably, the signal comparison module includes a rectification filter unit and a switch control unit, the rectification filter unit is configured to rectify and filter the amplified output signal of the signal amplification module into a dc level signal, and the switch control unit is configured to determine to output a high level signal or a low level signal according to the dc level signal.
Preferably, the rectifying and filtering unit includes a rectifying diode D1, a rectifying diode D2, a capacitor C13 and a capacitor C14, a cathode of the rectifying diode D2 and an anode of the rectifying diode D1 are both connected to one end of the capacitor C13, the other end of the capacitor C13 is connected to an output end of the signal amplification module, an anode of the rectifying diode D2 is grounded, and a cathode of the rectifying diode D1 is grounded through the capacitor C14; the switch control unit comprises a triode Q3, a triode Q4, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a voltage stabilizing diode D3, the output end of the rectifying and filtering unit is connected with the base of the triode Q3 through the resistor R12, the base of the triode Q3 is grounded through the resistor R11, the resistor R14 is a pull-up resistor of the collector of the triode Q3, the base of the triode Q4 is grounded through the resistor R13, the cathode of the voltage stabilizing diode D3 is connected with the collector of the triode Q3, the anode of the voltage stabilizing diode D3 is connected with the base of the triode Q4, and the collector of the triode Q4 is connected with the output control end of the power amplification module.
Preferably, the power amplification module comprises an RC filtering unit, an audio power amplifier U1 and a speaker Y1; be equipped with resistance R5 and resistance R6 that are used for controlling power amplification module output volume between audio power amplifier U1's the input and the RC filtering unit, audio power amplifier U1's output is connected with loudspeaker Y1's input, audio power amplifier U1's power input end connects the power, audio power amplifier U1's power input end is equipped with the electric capacity filtering unit.
Preferably, the power amplification module further includes a capacitor C9, a capacitor C10, a magnetic bead L2, and a magnetic bead L3, two output ends of the audio power amplifier U1 are respectively connected to two input ends of the speaker Y1 through a magnetic bead L2 and a magnetic bead L3, and two input ends of the speaker Y1 are respectively grounded through a capacitor C9 and a capacitor C10.
An audio device comprises the audio control circuit.
The utility model has the advantages that:
the utility model provides a pair of audio control circuit and equipment, when the audio frequency is in lower volume, amplify the audio signal that the volume is low by signal amplification module earlier, be convenient for follow-up size comparison, the signal of amplification is compared with the setting value in the signal comparison module, if the signal of amplification is less than the setting signal in the signal comparison module, then signal comparison module output high level to the output control end of power amplification module, control power amplification module does not have the output, the noise of low volume can not be exported; when the amplified signal is greater than the set signal of the signal comparison module, the signal comparison module outputs a low-level signal to an output control end of the power amplification module, so that the power amplification module outputs the signal; namely, noise can be eliminated through the noise elimination module when the audio signal is in a low volume state; when audio is played, the high-frequency and low-frequency signals of the audio signals with low volume are processed through the high-frequency and low-frequency band adjusting module, and people can obtain abundant high-frequency signals and low-frequency signals.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
The reference numerals in fig. 1 include:
the device comprises a 1-high-low frequency band adjusting module, a 2-power amplifying module, a 21-RC filtering unit, a 22-capacitance filtering unit, a 3-noise eliminating module, a 31-signal amplifying module, a 32-signal comparing module, a 311-first-stage amplifying unit, a 312-second-stage amplifying unit, a 321-rectifying filtering unit and a 322-switch control unit.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention will be described in detail with reference to the accompanying drawings.
An audio control circuit provided in this embodiment, as shown in fig. 1, includes a high-low band adjusting module 1, a power amplifying module 2, and a noise canceling module 3, where an audio signal passes through the high-low band adjusting module 1 and then is input to the power amplifying module 2 and the noise canceling module 3, and an output end of the noise canceling module 3 is electrically connected to an output control end of the power amplifying module 2; the high-low frequency band adjusting module 1 comprises a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1 and an adjustable potentiometer RP1, wherein a first fixed end of the adjustable potentiometer RP1 is electrically connected with one end of the capacitor C1, a second fixed end of the adjustable potentiometer RP1 is grounded, the other end of the capacitor C1 is electrically connected with one end of a capacitor C2, the other end of the capacitor C2 is electrically connected with a resistor R1, the other end of the resistor R1 is grounded, taps of the adjustable potentiometer RP1 are respectively electrically connected with the capacitor C1 and the capacitor C2, and an adjusting end of the adjustable resistor RP1 is connected with an input end of the power amplification module 2; the noise cancellation module 3 includes a signal amplification module 31 and a signal comparison module 32, where the signal amplification module 31 is configured to amplify an output signal of the high-low band adjustment module 1, and the signal comparison module 32 is configured to receive the signal amplified by the signal amplification module 31 and output a control signal to an output control end of the power amplification module 2 according to the signal.
Specifically, when the audio is at a low volume, the signal amplification module 31 amplifies the audio signal with a low volume, so as to facilitate subsequent size comparison, the amplified signal is compared with a set value in the signal comparison module 32, and if the amplified signal is smaller than the set signal in the signal comparison module 32, the signal comparison module 32 outputs a high level to the output control end of the power amplification module 2, so as to control the power amplification module 2 to have no output, i.e., the low volume noise cannot be output; when the amplified signal is greater than the setting signal of the signal comparison module 32, the signal comparison module 32 outputs a low level signal to the output control end of the power amplification module 2, so that the power amplification module 2 outputs a signal; namely, noise can be eliminated through the noise elimination module 3 when the audio signal is in a low volume state; when audio is played, the high-frequency and low-frequency signals of the audio signal with low volume are processed through the high-low frequency band adjusting module 1, and people can obtain abundant high-frequency signals and low-frequency signals.
The working principle of the high-low frequency band adjusting module 1 is as follows: the tap a position of the adjustable potentiometer RP1 is shown in fig. 1, which is a loudness control for the left channel, the right channel being symmetric to the left channel. In fig. 1, a capacitor C1, a capacitor C2, and a resistor R1 constitute a compensation circuit.
When the volume is small, when the audio input signal ui is a high-frequency signal, because the capacitive reactance of the capacitor C1 is small, the audio input signal ui directly passes through the capacitor C1, the tap a of the adjustable potentiometer RP1 and the adjusting end of the adjustable potentiometer RP1 in sequence, and then is input into the power amplification module 2, so that the high-frequency signal is boosted without the partial voltage of the adjustable potentiometer RP 1. For the middle and low frequency band signals of the audio signal ui, the capacitance C1 is small, so that the signals can be transmitted to the adjusting terminal only through the adjustable potentiometer RP 1. An RC series network formed by the capacitor C2 and the resistor R1 connected between the tap a of the adjustable potentiometer RP1 and the ground is a low-frequency boost network, the turning frequency of the RC series network is f, and the impedance of the RC series network to the intermediate-frequency signal higher than the frequency f is small, so that the shunt attenuation of the intermediate-frequency signal is realized, and relatively speaking, the impedance of the capacitor C2 and the resistor R1 to the low-frequency signal is large and the shunt attenuation is not realized, so that the low-frequency signal is boosted. Although the high band signal is also affected by the shunt, the attenuation of the high band is limited because the resistance of the resistor R1 is set to be larger, and the high band signal is still boosted because the high band signal is already boosted by the capacitor C1. In practical applications, when the adjusting end of the adjustable potentiometer RP1 is located at the tap a, the high-frequency and low-frequency band signals are maximally boosted, and when the adjusting end of the adjustable potentiometer RP1 slides downward from the tap a, the amounts of boosting of the high-frequency and low-frequency bands are kept unchanged. When the adjusting end of the adjustable potentiometer RP1 is slid up from the tap a, the amount of boost for high and low frequencies is gradually reduced, and when the adjusting end of the adjustable potentiometer RP1 is slid to the top, the volume of the audio signal ui is maximized, and at this time, the high and low frequency signals have no boost effect, because the volume is large enough, no boost is needed. The high-low band adjustment module 1 is thus able to make up for the lack of sensitivity of people to high and low frequency signals at low volumes. And the noise elimination module 3 is matched, so that the audio signal has a good processing effect when the volume is low.
In the audio control circuit provided by this embodiment, as shown in fig. 1, the signal amplifying module 31 includes a first-stage amplifying unit 311 and a second-stage amplifying unit 312, an output end of the first-stage amplifying unit 311 is connected to an input end of the second-stage amplifying unit 312, an input end of the first-stage amplifying unit 311 is connected to an output end of the high-low band adjusting module 1, and an output end of the second-stage amplifying unit 312 is connected to an input end of the signal comparing module 32. The primary amplification unit 311 comprises a transistor Q1, a capacitor C12, a resistor R9, a resistor R7 and a resistor R8, and the secondary amplification unit 312 comprises a transistor Q2 and a resistor R10; the output signal of the high-low frequency band adjusting module 1 is input to the base of a triode Q1 through a capacitor C12, the base of the triode Q1 is grounded after passing through a resistor R7 and a resistor R8 in sequence, the collector of the triode Q1 is connected with the base of a triode Q2, the emitter of the triode Q2 is grounded after passing through a resistor R8, the collector of the triode Q2 is an amplified signal output end, the resistor R9 is a pull-up resistor of the collector of the triode Q1, and the resistor R10 is a pull-up resistor of the collector of the triode Q2.
The signal comparison module 32 includes a rectifying and filtering unit 321 and a switch control unit 322, the rectifying and filtering unit 321 is configured to rectify and filter the amplified output signal of the signal amplification module 31 into a dc level signal, and the switch control unit 322 is configured to determine to output a high level signal or a low level signal according to the dc level signal; the rectifying and filtering unit 321 comprises a rectifying diode D1, a rectifying diode D2, a capacitor C13 and a capacitor C14, wherein a cathode of the rectifying diode D2 and an anode of the rectifying diode D1 are both connected with one end of the capacitor C13, the other end of the capacitor C13 is connected with an output end of the signal amplification module 31, an anode of the rectifying diode D2 is grounded, and a cathode of the rectifying diode D1 is grounded through the capacitor C14; the switch control unit 322 includes a triode Q3, a triode Q4, a resistor R11, a resistor R12, a resistor R13, a resistor R14, and a zener diode D3, the output end of the rectifying and filtering unit 321 is connected with the base of the triode Q3 through the resistor R12, the base of the triode Q3 is grounded through the resistor R11, the resistor R14 is a pull-up resistor of the collector of the triode Q3, the base of the triode Q4 is grounded through the resistor R13, the cathode of the zener diode D3 is connected with the collector of the triode Q3, the anode of the zener diode D3 is connected with the base of the triode Q4, and the collector of the triode Q4 is connected with the output control end of the power amplification module 2.
Specifically, after the output signal of the high-low band adjusting module 1 is amplified twice by the transistor Q1 and the transistor Q2 of the noise eliminating module 3, the audio signal is rectified and filtered by the rectifying and filtering unit 321 to become a dc level signal, the level value of the dc level signal is used to control the on/off of the switch control unit 322, when the level value of the dc level signal is higher than the set value, the switch control unit 322 is controlled to be turned on, and the power amplification module 2 is controlled to output a signal, otherwise, when the level value of the dc level signal is lower than the set value, the switch control unit 322 is turned off, and the power amplification module 2 does not output a signal, so that when there is no input audio signal or the audio signal is at the lowest volume, the other impurity signals cannot control the switch control unit 322 to be turned on due to weak signals, so that the power amplification module 2 does not output signals.
The rectifier diode D1 and the rectifier diode D2 rectify the signal, the capacitor C14 filters the rectified signal, the audio signal is rectified and filtered into a dc level signal, and then the dc level signal is inputted into the switch control unit 322, in the switch control unit 322, the transistor Q4 and the transistor Q3 are used as a switch, the resistor R12 and the resistor R11 are used for dividing voltage to provide a bias voltage for the base of the transistor Q3, if the dc level signal outputted from the rectifier and filter unit 321 is high enough to make the voltage passing through the resistor R12 reach the threshold voltage of the transistor Q3, the transistor Q3 is turned on, the cathode voltage of the zener diode D3 is pulled down, so that the zener diode D3 is not turned on, that is, the power voltage can pass through the voltage division of the resistor R14 and the resistor R13, the bias voltage cannot be provided for the base of the transistor Q4, so that the transistor Q4 is turned off, therefore, the level signal at the control terminal of the power amplification module 2 connected with the collector of the transistor Q4 is pulled up by the built, the high-level control end controls the power amplification module 2 to output an audio signal; if the dc level signal output by the rectifying and filtering unit 321 is low and the transistor Q3 cannot be turned on, the zener diode D3 is turned on, the transistor Q4 is turned on, the control terminal of the power amplification module 2 is pulled low, and the power amplification module 2 cannot output a signal.
In the audio control circuit provided in this embodiment, as shown in fig. 1, the power amplification module 2 includes an RC filtering unit 21, an audio power amplifier U1, and a speaker Y1; be equipped with resistance R5 and resistance R6 that are used for controlling 2 output volumes of power amplification module between audio power amplifier U1's the input and the RC filter unit 21, audio power amplifier U1's output is connected with loudspeaker Y1's input, audio power amplifier U1's power input end connects the power, audio power amplifier U1's power input end is equipped with electric capacity filter unit 22. The power amplification module 2 further includes a capacitor C9, a capacitor C10, a magnetic bead L2 and a magnetic bead L3, two output ends of the audio power amplifier U1 are respectively connected with two input ends of the speaker Y1 through a magnetic bead L2 and a magnetic bead L3, and two input ends of the speaker Y1 are respectively grounded through a capacitor C9 and a capacitor C10.
Specifically, the RC filtering unit 21 filters out high-frequency noise in the audio signal, so as to reduce interference of the high-frequency noise to the circuit; the audio power amplifier U1 adopts single-ended input, the output of the RC filter unit 21 is connected with one input end of the audio power amplifier U1, an audio signal is input into the audio power amplifier U1, and the audio signal processed by the audio power amplifier U1 is output to a loudspeaker Y1 and is converted into a sound signal to be output; the audio power amplifier U1 is an MT6950 chip, which has low noise and ensures the sound quality of the audio signal after power amplification, the capacitance filtering unit 22 at the power input end of the audio power amplifier U1 comprises a decoupling capacitor C7, a decoupling capacitor C6 and a decoupling capacitor C8, which decouple the input power of the audio power amplifier U1, different capacitors act on different types of noise of the power, a capacitor C6 acts on high-frequency noise at the analog power input end VDD of the audio power amplifier U1, and a capacitor C8 and a capacitor C7 act on low-frequency noise and high-frequency noise at the power input end PVDD of the audio power amplifier U1, thereby ensuring sufficient power decoupling, reducing output total harmonic distortion and power supply rejection ratio, and ensuring the sound quality of the audio signal amplified by the audio power amplifier U1. The capacitor C9, the capacitor C10, the magnetic bead L2 and the magnetic bead L3 form LC high-frequency filtering, so that high-frequency signals in output signals of the audio power amplifier U1 are restrained, and wireless interference of the audio power amplifier U1 to the outside is reduced.
The audio device provided by the embodiment adopts the audio control circuit to control the audio signal, and can have better tone quality in a low-tone stage.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention is disclosed in the preferred embodiment, it is not limited to the above description, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, but all the technical solutions of the present invention are within the scope of the present invention.
Claims (8)
1. An audio control circuit, comprising: the device comprises a high-low frequency band adjusting module, a power amplifying module and a noise eliminating module, wherein an audio signal passes through the high-low frequency band adjusting module and then is respectively input into the power amplifying module and the noise eliminating module, and the output end of the noise eliminating module is electrically connected with the output control end of the power amplifying module;
the high-low frequency band adjusting module comprises a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1 and an adjustable potentiometer RP1, wherein a first fixed end of the adjustable potentiometer RP1 is electrically connected with one end of the capacitor C1, a second fixed end of the adjustable potentiometer RP1 is grounded, the other end of the capacitor C1 is electrically connected with one end of the capacitor C2, the other end of the capacitor C2 is electrically connected with the resistor R1, the other end of the resistor R1 is grounded, taps of the adjustable potentiometer RP1 are respectively electrically connected with the capacitor C1 and the capacitor C2, and an adjusting end of the adjustable resistor RP1 is connected with an input end of the power amplifying module;
the noise elimination module comprises a signal amplification module and a signal comparison module, the signal amplification module is used for amplifying the output signals of the high-low frequency band adjustment module, and the signal comparison module is used for receiving the signals amplified by the signal amplification module and outputting control signals to the output control end of the power amplification module according to the signals.
2. The audio control circuit of claim 1, wherein: the signal amplification module comprises a primary amplification unit and a secondary amplification unit, wherein the output end of the primary amplification unit is connected with the input end of the secondary amplification unit, the input end of the primary amplification unit is connected with the output end of the high-low frequency band adjustment module, and the output end of the secondary amplification unit is connected with the input end of the signal comparison module.
3. The audio control circuit of claim 2, wherein: the first-stage amplification unit comprises a triode Q1, a capacitor C12, a resistor R9, a resistor R7 and a resistor R8, and the second-stage amplification unit comprises a triode Q2 and a resistor R10;
the output signal of the high-low frequency band adjusting module is input into the base of a triode Q1 through a capacitor C12, the base of the triode Q1 is grounded after sequentially passing through a resistor R7 and a resistor R8, the collector of the triode Q1 is connected with the base of a triode Q2, the emitter of the triode Q2 is grounded after passing through a resistor R8, the collector of the triode Q2 is an amplified signal output end, the resistor R9 is a pull-up resistor of the collector of the triode Q1, and the resistor R10 is a pull-up resistor of the collector of the triode Q2.
4. The audio control circuit of claim 1, wherein: the signal comparison module comprises a rectification filtering unit and a switch control unit, the rectification filtering unit is used for rectifying and filtering the amplified output signal of the signal amplification module into a direct current level signal, and the switch control unit is used for judging and outputting a high level signal or a low level signal according to the direct current level signal.
5. The audio control circuit of claim 4, wherein: the rectifying and filtering unit comprises a rectifying diode D1, a rectifying diode D2, a capacitor C13 and a capacitor C14, wherein the cathode of the rectifying diode D2 and the anode of the rectifying diode D1 are both connected with one end of the capacitor C13, the other end of the capacitor C13 is connected with the output end of the signal amplification module, the anode of the rectifying diode D2 is grounded, and the cathode of the rectifying diode D1 is grounded through the capacitor C14;
the switch control unit comprises a triode Q3, a triode Q4, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a voltage stabilizing diode D3, the output end of the rectifying and filtering unit is connected with the base of the triode Q3 through the resistor R12, the base of the triode Q3 is grounded through the resistor R11, the resistor R14 is a pull-up resistor of the collector of the triode Q3, the base of the triode Q4 is grounded through the resistor R13, the cathode of the voltage stabilizing diode D3 is connected with the collector of the triode Q3, the anode of the voltage stabilizing diode D3 is connected with the base of the triode Q4, and the collector of the triode Q4 is connected with the output control end of the power amplification module.
6. The audio control circuit of claim 1, wherein: the power amplification module comprises an RC filtering unit, an audio power amplifier U1 and a loudspeaker Y1;
be equipped with resistance R5 and resistance R6 that are used for controlling power amplification module output volume between audio power amplifier U1's the input and the RC filtering unit, audio power amplifier U1's output is connected with loudspeaker Y1's input, audio power amplifier U1's power input end connects the power, audio power amplifier U1's power input end is equipped with the electric capacity filtering unit.
7. The audio control circuit of claim 6, wherein: the power amplification module further comprises a capacitor C9, a capacitor C10, a magnetic bead L2 and a magnetic bead L3, two output ends of the audio power amplifier U1 are respectively connected with two input ends of a loudspeaker Y1 through a magnetic bead L2 and a magnetic bead L3, and two input ends of the loudspeaker Y1 are respectively grounded through a capacitor C9 and a capacitor C10.
8. An audio device, characterized by: comprising an audio control circuit as claimed in any one of claims 1 to 7.
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| CN201922312227.0U CN210629837U (en) | 2019-12-20 | 2019-12-20 | Audio control circuit and equipment |
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| CN201922312227.0U CN210629837U (en) | 2019-12-20 | 2019-12-20 | Audio control circuit and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114401475A (en) * | 2022-02-23 | 2022-04-26 | 广州高新兴机器人有限公司 | Audio amplifier system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114401475A (en) * | 2022-02-23 | 2022-04-26 | 广州高新兴机器人有限公司 | Audio amplifier system |
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