CN219287469U - Audio static noise elimination circuit - Google Patents
Audio static noise elimination circuit Download PDFInfo
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- CN219287469U CN219287469U CN202223271019.9U CN202223271019U CN219287469U CN 219287469 U CN219287469 U CN 219287469U CN 202223271019 U CN202223271019 U CN 202223271019U CN 219287469 U CN219287469 U CN 219287469U
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- power amplifier
- audio
- triode
- loudspeaker
- power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model provides an audio static noise elimination circuit, which relates to the technical field of power amplifiers and comprises a power amplifier control module and a power amplifier module, wherein the power amplifier control module comprises a triode Q8, the base electrode of the triode Q8 receives an intercom enabling signal, the emitting electrode is grounded, and the collecting electrode is connected with the power amplifier module and is used for enabling the power amplifier module to work when receiving the intercom enabling signal; the power amplifier module receives the audio signal, and is connected with the loudspeaker for the audio signal of during operation with the input is amplified the back and is broadcast through loudspeaker, has realized under the static environment, and the power amplifier circuit is inoperative, has avoided appearing the electric current sound of audio interference.
Description
Technical Field
The utility model relates to the technical field of power amplifiers, in particular to an audio static noise elimination circuit.
Background
With the increasing demands of monitoring and intercom in the security industry, speakers are built in electronic devices such as many cameras to realize intercom of users. In the use process of the electronic equipment, interference signals, such as reduced filter capacitance of a power circuit and large contact impedance between an audio output signal wire of a front-stage network board and a ground wire, can cause an alternating current signal of power frequency 50HZ, and also can cause a loudspeaker to output buzzing current sound, particularly, the buzzing current sound is particularly harsh in a quiet environment, and the use feeling of the electronic equipment product is seriously affected.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides an audio static noise elimination circuit.
The technical scheme adopted for solving the technical problems is as follows: in an audio static noise cancellation circuit, the improvement comprising: the power amplifier comprises a power amplifier control module and a power amplifier module, wherein the power amplifier control module comprises a triode Q8, the base electrode of the triode Q8 receives an intercom enabling signal, the emitting electrode is grounded, and the collecting electrode is connected with the power amplifier module and is used for enabling the power amplifier module to work when receiving the intercom enabling signal; the power amplification module receives the audio signal and is connected with the loudspeaker and used for amplifying the input audio signal and playing the audio signal through the loudspeaker when in operation.
In the above circuit, the power amplifier module includes a power amplifier U4, and an enabling port of the power amplifier U4 is connected to a collector of the triode Q8, so that the power amplifier U4 works when the triode Q8 receives an intercom enabling signal;
the audio input port of the power amplifier U4 receives an audio signal, and the audio output port is connected with a loudspeaker and is used for amplifying the input audio signal and playing the amplified audio signal through the loudspeaker when the power amplifier U4 works.
In the circuit, the power supply module further comprises a power supply chip U5, the power supply chip U5 is connected with the first voltage and converts the first voltage into the second voltage, and the second voltage supplies power for the triode Q8 and the power amplifier U4.
The beneficial effects of the utility model are as follows: by receiving the intercom enabling signal, the power amplifier is controlled to work, even if audio interference occurs, the power amplifier cannot work, current sound of the audio interference cannot be amplified and output, the fact that the power amplifier circuit does not work in a static environment is achieved, and the current sound of the audio interference is avoided.
Drawings
Fig. 1 is a circuit schematic diagram of a power amplifier control module in an audio static noise cancellation circuit according to the present utility model.
Fig. 2 is a circuit schematic diagram of a power amplifier module in an audio static noise cancellation circuit according to the present utility model. Fig. 3 is a circuit schematic of a power module in an audio static noise cancellation circuit according to the present utility model.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all the coupling/connection relationships referred to in the patent are not direct connection of the single-finger members, but rather, it means that a better coupling structure can be formed by adding or subtracting coupling aids depending on the specific implementation. The technical features in the utility model can be interactively combined on the premise of no contradiction and conflict.
Referring to fig. 1 and 2, the utility model discloses an audio static noise cancellation circuit, which comprises a power amplifier control module 10 and a power amplifier module 20, wherein the power amplifier control module 10 comprises a triode Q8, the power amplifier module 20 comprises a power amplifier U4, the base electrode of the triode Q8 receives an intercom enabling signal, the emitter electrode is grounded, and the collector electrode is connected with an enabling port of the power amplifier U4 and is used for enabling the power amplifier U4 to work when receiving the intercom enabling signal; the audio input port of the power amplifier U4 receives an audio signal, the audio output port is connected with a loudspeaker, and the power amplifier U4 amplifies the input audio signal and plays the amplified audio signal through the loudspeaker when working. By receiving the intercom enabling signal, the power amplifier U4 is controlled to work, even if audio interference occurs, the power amplifier U4 does not work, current sound of the audio interference is not amplified and output, and therefore the problem that current buzzing in the circuit is thoroughly solved because a power amplifier circuit does not work in a static environment is solved.
When the intercom is started, the base electrode of the triode Q8 receives an intercom enabling signal with high level, at the moment, the triode Q8 is conducted and saturated, the collector electrode and the emitter electrode of the triode Q8 are conducted, the enabling port CS of the low-power amplifier U4 is pulled, the power amplifier U4 works, intercom sound is input through the audio input port-IN of the power amplifier U4, and after the power amplifier U4 amplifies the audio, the power amplifier U4 outputs sound through a loudspeaker; when the intercom is not started, the power amplifier is required to be in a static state at the moment, when the intercom is not started, the base electrode of the triode Q8 receives a low-level signal, the triode Q8 is cut off at the moment, the power amplifier U4 does not receive an enabling signal, the power amplifier U4 does not work, the audio signal is not amplified, sound is not output from the loudspeaker, and current sound of audio interference is avoided.
The model of the triode Q8 is MMBT3904, and the model of the power amplifier U4 is INC_8002.
Referring to fig. 3, the present utility model further includes a power module 30, where the power module 30 includes a power chip U5, and the power chip U5 is connected to the first voltage 12V and converts the first voltage into the second voltage 5V, and the second voltage 5V supplies power to the triode Q8 and the power amplifier U4. The model of the power chip U5 is SY8201C.
When the user remotely talkbacks with the equipment, the audio output by the loudspeaker at the equipment end can be circularly transmitted to the user remote end through the pickup, and thus, the cyclic transmission can cause equipment self-excitation products. The utility model also picks up all the sound emitted by the environment and the sound emitted by the loudspeaker through the pickup, and processes and saves the sound generated by only recognizing the environment when the sound emitted by the loudspeaker is judged to be the sound emitted by the loudspeaker through program recognition and comparison.
According to the audio static noise eliminating circuit, the power amplifier is controlled to work by receiving the intercom enabling signal, even if audio interference occurs, the power amplifier cannot work, current sound of the audio interference cannot be amplified and output, the fact that the power amplifier circuit does not work under a static environment is achieved, and the current sound of the audio interference is avoided.
While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications or substitutions are included in the scope of the present utility model as defined in the appended claims.
Claims (3)
1. An audio static noise cancellation circuit, characterized in that: the power amplifier comprises a power amplifier control module and a power amplifier module, wherein the power amplifier control module comprises a triode Q8, the base electrode of the triode Q8 receives an intercom enabling signal, the emitting electrode is grounded, and the collecting electrode is connected with the power amplifier module and is used for enabling the power amplifier module to work when receiving the intercom enabling signal;
the power amplification module receives the audio signal and is connected with the loudspeaker and used for amplifying the input audio signal and playing the audio signal through the loudspeaker when in operation.
2. An audio static noise cancellation circuit according to claim 1, wherein: the power amplifier module comprises a power amplifier U4, an enabling port of the power amplifier U4 is connected with a collector electrode of the triode Q8, and the power amplifier U4 is enabled to work when the triode Q8 receives an intercom enabling signal;
the audio input port of the power amplifier U4 receives an audio signal, and the audio output port is connected with a loudspeaker and is used for amplifying the input audio signal and playing the amplified audio signal through the loudspeaker when the power amplifier U4 works.
3. An audio static noise cancellation circuit according to claim 2, wherein: the power supply module comprises a power supply chip U5, the power supply chip U5 is connected with a first voltage and converts the first voltage into a second voltage, and the second voltage supplies power for the triode Q8 and the power amplifier U4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223271019.9U CN219287469U (en) | 2022-12-06 | 2022-12-06 | Audio static noise elimination circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223271019.9U CN219287469U (en) | 2022-12-06 | 2022-12-06 | Audio static noise elimination circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219287469U true CN219287469U (en) | 2023-06-30 |
Family
ID=86920576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223271019.9U Active CN219287469U (en) | 2022-12-06 | 2022-12-06 | Audio static noise elimination circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219287469U (en) |
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2022
- 2022-12-06 CN CN202223271019.9U patent/CN219287469U/en active Active
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