CN218550159U - Audio squelch circuit - Google Patents
Audio squelch circuit Download PDFInfo
- Publication number
- CN218550159U CN218550159U CN202221844999.4U CN202221844999U CN218550159U CN 218550159 U CN218550159 U CN 218550159U CN 202221844999 U CN202221844999 U CN 202221844999U CN 218550159 U CN218550159 U CN 218550159U
- Authority
- CN
- China
- Prior art keywords
- audio
- module
- detection
- circuit
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 230000003321 amplification Effects 0.000 claims abstract description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 16
- 230000005236 sound signal Effects 0.000 claims abstract description 12
- 238000007493 shaping process Methods 0.000 claims 1
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model provides an audio squelch circuit, which comprises an audio input module, an audio detection module, a waveform sorting module and a control output module; the audio input module is connected with the audio detection module, the audio detection module is connected with the waveform sorting module, and the waveform sorting module is connected with the control output module; the audio detection circuit is used for detecting whether an audio signal exists in the circuit or not by adjusting the voltage division value of the detection resistor, wherein the resistance value of the detection resistor can be adjusted according to the characteristics of the input audio signal; the waveform sorting module is used for eliminating useless signals generated in the detection circuit and sending the audio signals to the control output module. The utility model discloses control and stop audio frequency amplification output when no sound source input, solved the noise problem of audio equipment when the standby.
Description
Technical Field
The utility model belongs to the technical field of the audio frequency is handled, concretely relates to audio frequency squelch circuit.
Background
At present, most audio power amplification chips are not provided with an output control switch, and output of output signals is not controlled in the aspect of sound sources, so that noise is easy to generate when audio equipment is in a standby state, and the noise is difficult to eliminate; at present, the mode of controlling the power supply and the audio input of the power amplifier chip is not ideal, so that a more optimized control circuit is urgently needed to realize the mode.
Disclosure of Invention
The above-mentioned not enough to prior art, the utility model provides an audio muting circuit to solve above-mentioned technical problem.
The utility model provides an audio muting circuit, include: the device comprises an audio input module, an audio detection module, a waveform sorting module and a control output module; the audio input module is connected with the audio detection module, the audio detection module is connected with the waveform sorting module, and the waveform sorting module is connected with the control output module;
the audio detection circuit is used for detecting whether an audio signal exists in the circuit or not by adjusting the voltage division value of the detection resistor, wherein the resistance value of the detection resistor can be adjusted according to the characteristic of the input audio signal;
the waveform sorting module is used for eliminating useless signals generated in the detection circuit and sending the audio signals to the control output module;
the control output module comprises an MOS tube and an audio power amplification chip, wherein the MOS tube is used as an output control switch, and the power amplification output is stopped under the condition of no audio input.
Further, the audio frequency detection circuit includes LM4250 chip.
Further, the waveform finishing module comprises a CD4093 chip.
Further, the audio power amplification chip is an LA4278 chip.
The utility model provides an audio muting circuit, can be effectual detect whether sound source input, control chip stops audio amplification output under the condition that there is no sound source input, the production of effective noise reduction; the problem of noise output when audio equipment does not have audio input is solved.
Furthermore, the utility model relates to a principle is reliable, and simple structure has very extensive application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a circuit according to an embodiment of the present application.
Fig. 2 is a circuit diagram of one embodiment of the present application.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 and fig. 2, the present embodiment provides an audio muting circuit, which includes an audio input module, an audio detection module, a waveform sorting module, and a control output module; the audio input module is connected with the audio detection module, the audio detection module is connected with the waveform sorting module, and the waveform sorting module is connected with the control output module; the audio detection circuit is used for detecting whether an audio signal exists in the circuit or not by adjusting the voltage division value of the detection resistor, wherein the resistance value of the detection resistor can be adjusted according to the characteristics of the input audio signal; the waveform sorting module is used for eliminating useless signals generated in the detection circuit and sending the audio signals to the control output module; the control output module comprises an MOS tube and an audio power amplification chip, wherein the MOS tube is used as an output control switch, and the power amplification output is stopped under the condition of no audio input.
The MOS tube inputs the control signal after waveform arrangement into the audio power amplification chip, pulse noise reduction is carried out through the audio power amplification chip, a capacitor pin of the audio power amplification chip is grounded with a power supply, and power amplification output is stopped under the condition that no audio is input. In this embodiment, the audio detection circuit includes an LM4250 chip; the waveform sorting module comprises a CD4093 chip; the audio power amplification chip is an LA4278 chip.
The utility model discloses audio muting circuit can accurately judge whether the circuit has audio input signal through audio frequency detection module to can accurately control audio output, realize the control audio frequency through the special pin of control audio power amplifier chip and enlarge the output. The circuit is simple in composition, ingenious in design and remarkable in effect.
Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and substance of the present invention, and these modifications or substitutions are intended to be within the scope of the present invention/any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. An audio muting circuit, comprising: the device comprises an audio input module, an audio detection module, a waveform sorting module and a control output module; the audio input module is connected with the audio detection module, the audio detection module is connected with the waveform sorting module, and the waveform sorting module is connected with the control output module;
the audio detection circuit is used for detecting whether an audio signal exists in the circuit or not by adjusting the voltage division value of the detection resistor, wherein the resistance value of the detection resistor can be adjusted according to the characteristics of the input audio signal;
the waveform sorting module is used for eliminating useless signals generated in the detection circuit and sending the audio signals to the control output module;
the control output module comprises an MOS tube and an audio power amplification chip, the MOS tube is used as an output control switch, and the power amplification output is stopped under the condition of no audio input.
2. The audio muting circuit according to claim 1, characterized in that the audio detection circuit comprises a LM4250 chip.
3. The audio muting circuit according to claim 1, characterized in that the waveform shaping module comprises a CD4093 chip.
4. The audio muting circuit according to claim 1, characterized in that the audio power amplification chip is a LA4278 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221844999.4U CN218550159U (en) | 2022-07-18 | 2022-07-18 | Audio squelch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221844999.4U CN218550159U (en) | 2022-07-18 | 2022-07-18 | Audio squelch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218550159U true CN218550159U (en) | 2023-02-28 |
Family
ID=85267696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221844999.4U Active CN218550159U (en) | 2022-07-18 | 2022-07-18 | Audio squelch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218550159U (en) |
-
2022
- 2022-07-18 CN CN202221844999.4U patent/CN218550159U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2091145B1 (en) | Pop noise suppression apparatus and audio output system utilizing the same | |
| CN203537555U (en) | Audio device | |
| CN204929213U (en) | Audio signal detects control circuit | |
| CN103346740A (en) | Class D audio power amplifier for suppressing noise and audio signal processing method thereof | |
| CN103166587A (en) | Audio processing circuit | |
| CN102438193B (en) | Safe earphone capable of automatically muting | |
| CN218550159U (en) | Audio squelch circuit | |
| CN102983825B (en) | A kind of category D amplifier chip | |
| CN102931931B (en) | Anti-sound break circuit for D-class power amplifier chip | |
| CN207184795U (en) | Mute circuit and audio frequency apparatus | |
| CN103458342A (en) | Circuit eliminating shutdown POP sound of audio power amplifier | |
| CN110504928A (en) | D class power amplifier powers on noise suppression circuit, method and apparatus | |
| CN101814897A (en) | Amplifying system and related method for improving glitch performance of amplifier | |
| US20190107570A1 (en) | Digital short detection method of class d amplifier | |
| CN203435137U (en) | Circuit for eliminating shutdown POP sound of audio power amplifier | |
| CN102685636B (en) | Voice-frequency circuit | |
| CN204578483U (en) | A kind of professional audio amplifier | |
| CN204408277U (en) | Power amplifier | |
| US20120263320A1 (en) | Gain Control Device for an Amplifier and Related Methods, and an Audio Processing Device | |
| CN209247871U (en) | A kind of power on and off detection circuit of automobile power system | |
| CN207677691U (en) | Audio amplifier circuit and signal amplify module | |
| CN202634678U (en) | Noise-reduction circuit | |
| CN201118792Y (en) | A silence control circuit | |
| CN209134366U (en) | A kind of standby heating system of switched mode power amplifier | |
| CN107864435B (en) | Audio power control method, control circuit and audio equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An Audio Muting Circuit Granted publication date: 20230228 Pledgee: Qilu bank Limited by Share Ltd. Ji'nan hero hill sub branch Pledgor: JINAN FUSHEN XINGAN TECHNOLOGY Co.,Ltd. Registration number: Y2024980013568 |