CN109195067A - A kind of muting control circuit - Google Patents
A kind of muting control circuit Download PDFInfo
- Publication number
- CN109195067A CN109195067A CN201810800671.4A CN201810800671A CN109195067A CN 109195067 A CN109195067 A CN 109195067A CN 201810800671 A CN201810800671 A CN 201810800671A CN 109195067 A CN109195067 A CN 109195067A
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- CN
- China
- Prior art keywords
- power amplifier
- resistance
- integration module
- control circuit
- feedback resistance
- 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.)
- Pending
Links
- 230000010354 integration Effects 0.000 claims abstract description 20
- 230000005236 sound signal Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
A kind of muting control circuit disclosed by the invention, including power amplifier integration module, audio player is connected between two sound output pins of power amplifier integration module, feedback resistance is connected between the input terminal of power amplifier integration module and one of sound output pin, the input terminal of power amplifier integration module also accesses input audio signal, the both ends of feedback resistance are parallel with resistance adjustable elements, and resistance adjustable elements are connected with the GPIO pin of main control MCU.A kind of muting control circuit of the invention is made chip gain be intended to 0, reaches muting function, returned chip gain normal, reach the normal effect of sound using the feedback resistance that resistance sizes control varying circuit changes power amplifier chips to change the gain of chip；The change of chip gain simultaneously can stablize within the time of 1ms, to guarantee that mute state can be quickly switched into normal condition, do not influence the usage experience of user, improve the performance of building conversational system.
Description
Technical field
The invention belongs to audio control circuit technical fields, and in particular to a kind of muting control circuit.
Background technique
Power amplifier integrated chip (such as LM4980) in the audio signal processing of building conversational system is without mute control
Pin, but have shutdown control (SHUTDOWN) pin, main control MCU can give one low level of the pin when needing mute,
Power amplifier chips are made to enter off-mode, thus mute.Main control MCU gives shutdown control one high level of pin, chip from shutdown
State wakes up, then needs 170ms~220ms power amplifier chips that could work normally.
When in use, someone presses the button building conversational system, needs to issue key prompting voice.Key prompting voice continues
Time only has 400ms, if not postponing 170ms~220ms, sends key prompting voice immediately, then key prompting voice lacks
The signal of 170ms~220ms causes to be difficult to listen, influences the usage experience of user；If delay 170ms~220ms retransmit by
Key sound can then allow the reaction of user's sensory system more blunt, also can greatly influence the usage experience of user.
Summary of the invention
The purpose of the present invention is to provide a kind of muting control circuit, enable power amplifier chips in mute state and normal
State is quickly converted, and conversion time is less than 1ms, will not influence user experience.
The technical scheme adopted by the invention is that: a kind of muting control circuit, including power amplifier integration module, the power amplifier collection
At being connected with audio player between two sound output pins of module, the input terminal of the power amplifier integration module and wherein one
Feedback resistance is connected between a sound output pin, the input terminal of the power amplifier integration module also accesses input audio signal,
The both ends of the feedback resistance are parallel with resistance adjustable elements, and the resistance adjustable elements are connected with the GPIO pin of main control MCU.
The features of the present invention also characterized in that
Further, the resistance adjustable elements include a triode, and the collector of the triode connects described anti-
The low one end of resistive voltage is presented, the emitter of the triode connects one end high in the feedback resistance voltage, the triode
Base stage connect the GPIO pin in the main control MCU.
Further, the resistance adjustable elements include a fixed resistance, and the both ends of the fixed resistance connect respectively
Between the base stage of triode and the GPIO pin of main control MCU.
Further, the both ends of feedback resistance are also parallel with filter capacitor.
Example, the model LM4890 of the power amplifier integration module.
The beneficial effects of the present invention are: a kind of muting control circuit of the invention, controls varying circuit using resistance sizes
The feedback resistance for changing power amplifier chips makes chip gain be intended to 0, reaches muting function, make core to change the gain of chip
Piece gain returns normally, reaches the normal effect of sound；The change of chip gain simultaneously can stablize within the time of 1ms, from
And guarantee that mute state can be quickly switched into normal condition, the usage experience of user is not influenced, improves building conversational system
Performance.
Detailed description of the invention
Fig. 1 is the circuit diagram of muting control circuit of the invention.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The circuit diagram of muting control circuit provided by the invention is as shown in Figure 1, include power amplifier integration module, power amplifier integrates mould
Audio broadcasting is connected between two sound output pins (Voice Out1 and Voice Out2, be abbreviated as VO1 and VO2) of block
Device SP2 is connected with feedback resistance R2 between the input terminal and the end VO1 of power amplifier integration module, and the input terminal of power amplifier integration module is also
Input audio signal is accessed, the both ends of feedback resistance R2 are parallel with resistance adjustable elements, and resistance adjustable elements are connected to main control MCU
GPIO pin.The both ends of feedback resistance R2 are also parallel with filter capacitor C3.
Specifically, resistance adjustable elements include a triode Q1 and fixed resistance R3, the collector of triode Q1 is connect
Feedback resistance voltage R2 low one end, emitter connect the one of the high one end of feedback resistance R2 voltage, base stage and fixed resistance R3
End is connected, another GPIO pin for terminating at main control MCU of fixed resistance R3.
Example, the model LM4890 of the power amplifier integration module of muting control circuit of the present invention, call receive sound with
The audio input signals such as jingle bell, keypad tone access its input terminal after capacitor C1 and resistance R1, and the DC5V voltage of power supply module connects
In its vdd terminal mouth, DC5V voltage is grounded after electrolytic capacitor C4, and vdd terminal mouth is also grounded, and the port BYPASS with NC connects electricity
It is grounded after holding C2.
The size of feedback resistance of the invention can influence the gain of power amplifier integration module；The GPIO pin of main control MCU can
Export high level or low level.
In use, triode Q1 conducting, feedback resistance R2 becomes smaller and is intended to 0, function when GPIO pin exports low level
The gain for putting integration module also tends to 0, into mute state；When GPIO pin exports high level, triode Q1 cut-off, feedback
Resistance R2 switchs to normally, and the gain of power amplifier integration module is switched to normal condition, the rapid external output audio signal in 1ms,
Ensuring to occur to postpone for a long time or lack voice signal influences user experience.
Claims (5)
1. a kind of muting control circuit, which is characterized in that including power amplifier integration module, two sound of the power amplifier integration module
Be connected with audio player between output pin, the input terminal of the power amplifier integration module and one of sound output pin it
Between be connected with feedback resistance, the input terminal of the power amplifier integration module also accesses input audio signal, the two of the feedback resistance
End is parallel with resistance adjustable elements, and the resistance adjustable elements are connected with the GPIO pin of main control MCU.
2. muting control circuit as described in claim 1, which is characterized in that the resistance adjustable elements include three poles
Pipe, the collector of the triode connect one end low in the feedback resistance voltage, and the emitter of the triode connects described
The high one end of feedback resistance voltage, the base stage of the triode connect the GPIO pin in the main control MCU.
3. muting control circuit as claimed in claim 2, which is characterized in that the resistance adjustable elements include a fixed electricity
Resistance, the both ends of the fixed resistance are connected to respectively between the base stage of triode and the GPIO pin of main control MCU.
4. muting control circuit as described in claim 1, which is characterized in that the both ends of the feedback resistance are also parallel with filtering
Capacitor.
5. muting control circuit as described in claim 1, which is characterized in that the model of the power amplifier integration module
LM4890。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810800671.4A CN109195067A (en) | 2018-07-20 | 2018-07-20 | A kind of muting control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810800671.4A CN109195067A (en) | 2018-07-20 | 2018-07-20 | A kind of muting control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109195067A true CN109195067A (en) | 2019-01-11 |
Family
ID=64936435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810800671.4A Pending CN109195067A (en) | 2018-07-20 | 2018-07-20 | A kind of muting control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109195067A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3942036A (en) * | 1970-09-05 | 1976-03-02 | Daimler-Benz Aktiengesellschaft | Brake force control system for vehicles especially motor vehicles |
| US4379997A (en) * | 1980-02-08 | 1983-04-12 | Tokyo Shibaura Denki Kabushiki Kaisha | Power amplifier |
| EP0095774A2 (en) * | 1982-05-31 | 1983-12-07 | Nec Corporation | A switching circuit operable as an amplifier and a muting circuit |
| US20020017951A1 (en) * | 2000-05-12 | 2002-02-14 | Tsuneo Kikuchi | Preamplification circuit |
| CN200969673Y (en) * | 2006-08-07 | 2007-10-31 | 海信集团有限公司 | Earphone silent circuit and television set having the same |
| CN201479354U (en) * | 2009-09-18 | 2010-05-19 | 青岛海信电器股份有限公司 | Power amplifier muting circuit |
| CN202870500U (en) * | 2012-10-08 | 2013-04-10 | 南京长峰航天电子科技有限公司 | Switch amplifying and switching link unit |
| CN103888874A (en) * | 2014-03-25 | 2014-06-25 | 建荣集成电路科技(珠海)有限公司 | Audio input and output device and audio input and output method |
| US20150219772A1 (en) * | 2014-02-04 | 2015-08-06 | Sony Corporation | Imaging apparatus, current/voltage conversion circuit, and imaging method |
| CN107800853A (en) * | 2017-09-21 | 2018-03-13 | 捷开通讯(深圳)有限公司 | Memory, mobile phone and its voicefrequency circuit and the outer of audio file put method |
-
2018
- 2018-07-20 CN CN201810800671.4A patent/CN109195067A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3942036A (en) * | 1970-09-05 | 1976-03-02 | Daimler-Benz Aktiengesellschaft | Brake force control system for vehicles especially motor vehicles |
| US4379997A (en) * | 1980-02-08 | 1983-04-12 | Tokyo Shibaura Denki Kabushiki Kaisha | Power amplifier |
| EP0095774A2 (en) * | 1982-05-31 | 1983-12-07 | Nec Corporation | A switching circuit operable as an amplifier and a muting circuit |
| US20020017951A1 (en) * | 2000-05-12 | 2002-02-14 | Tsuneo Kikuchi | Preamplification circuit |
| CN200969673Y (en) * | 2006-08-07 | 2007-10-31 | 海信集团有限公司 | Earphone silent circuit and television set having the same |
| CN201479354U (en) * | 2009-09-18 | 2010-05-19 | 青岛海信电器股份有限公司 | Power amplifier muting circuit |
| CN202870500U (en) * | 2012-10-08 | 2013-04-10 | 南京长峰航天电子科技有限公司 | Switch amplifying and switching link unit |
| US20150219772A1 (en) * | 2014-02-04 | 2015-08-06 | Sony Corporation | Imaging apparatus, current/voltage conversion circuit, and imaging method |
| CN103888874A (en) * | 2014-03-25 | 2014-06-25 | 建荣集成电路科技(珠海)有限公司 | Audio input and output device and audio input and output method |
| CN107800853A (en) * | 2017-09-21 | 2018-03-13 | 捷开通讯(深圳)有限公司 | Memory, mobile phone and its voicefrequency circuit and the outer of audio file put method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190111 |
|
| RJ01 | Rejection of invention patent application after publication |