CN1767607A - Mute circuit for open and close - Google Patents
Mute circuit for open and close Download PDFInfo
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- CN1767607A CN1767607A CN 200510021799 CN200510021799A CN1767607A CN 1767607 A CN1767607 A CN 1767607A CN 200510021799 CN200510021799 CN 200510021799 CN 200510021799 A CN200510021799 A CN 200510021799A CN 1767607 A CN1767607 A CN 1767607A
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Abstract
This invention discloses a switch mute circuit including an accompany power amplifying circuit chip with a mute function in an accompany signal process system characterizing: the mute lead-pin of the chip is connected with the output end of a NOR gate circuit with two input ends, one of which is that of pulse signals generated by charging inert elements during the transient transition period when the DC rises from 0v and the switch is on, the other one is the input end of pulse signals generated by discharging of the inert elements during the transient period when the DC voltage falls to 0v and the switch is off.
Description
Technical field
The present invention relates to the receiver circuit that television system is used for sound signal, especially relate to a kind of mute circuit for open and close.
Background technology
The power amplification circuit chip of existing television audio signal processing system all has an independent quiet pin, master cpu detect at TV/AV switch, TV changes platform, when depositing in the process of platform no signal automatically or after the user pushes quiet key, export a high level by its I/O pin, quiet pin current potential is descended, just can make the power amplification circuit chip be in mute state.But, the user push ac power switch or remote controller treat behind the switch energized by transient state to the stable state transition period, the noise of circuit inside is attached on the sound accompaniment audio signal and amplifies through the power amplification circuit chip, by its OUT1, the OUT2 pin export to loud speaker can restore " bang ", " bang " VGA CARD, by the same token, the user push once more ac power switch or remote controller treat cut off the electricity supply by transient state to the stable state transition period behind the switch, loud speaker also can restore " bang ", " bang " the shutdown noise, described switching on and shutting down noise directly influences user's the mood of watching.
Summary of the invention
Technical problem to be solved by this invention is to overcome the drawback that above-mentioned prior art exists, and proposes a kind of mute circuit for open and close, to eliminate the switching on and shutting down noise that sends in pushing the process for the treatment of switch of ac power switch or remote controller.
Technical problem of the present invention is solved like this:
This mute circuit for open and close comprises the sound accompaniment power amplification circuit chip of the band mute function of audio signal treatment system.
The characteristics of this mute circuit for open and close are:
The quiet pin of described sound accompaniment power amplification circuit chip is connected an output that the OR-NOT circuit of two inputs arranged, a described input is the pulse signal input terminal that transient state transition period that start moment direct voltage rises from 0V is produced by the inert element charging, and described another input is that shutdown moment direct voltage drops to the pulse signal input terminal of the transient state transition period of 0V by the inert element discharge generation.
In non-switching on and shutting down moments, two inputs of described OR-NOT circuit are level "0", and its output is a level"1", and the level of the quiet pin of sound accompaniment power amplification circuit chip makes the sound accompaniment power amplification circuit be in non-mute state.
Opening or closing machine moment, one of two inputs of described OR-NOT circuit are level"1", and its output is a level "0", and the level of the quiet pin of sound accompaniment power amplification circuit chip makes the sound accompaniment power amplification circuit be in mute state.
Technical problem of the present invention is to solve according to qualifications like this:
Described OR-NOT circuit is made up of the switch triode that two collector electrodes are interconnected to output;
The base stage of a described switch triode is an input of OR-NOT circuit, be connected with DC power supply by a base bleederresistance, a coupling resistance and a polar capacitor, and emitter connects public ground, and cross-over connection is by the parallel circuits of being made up of the overcurrent protection diode of another base bleederresistance and a plus earth between the tie point of a described base bleederresistance and a coupling resistance and the public ground;
Described another switch triode is a NPN type triode, its base stage connects public ground, and emitter to be another input of OR-NOT circuit be connected with the positive pole of another coupling resistance with a DC power supply and a described polar capacitor by another polar capacitor, cross-over connection is by the parallel circuits of being made up of an emitter resistance and an earthed-cathode clamping diode between the emitter of described another switch triode and the public ground.
In non-switching on and shutting down moments, two inputs of described two switch triodes are level "0", and its output is a level"1", and the quiet pin of sound accompaniment power amplification circuit chip is a high level, is in non-mute state;
Push the shutdown moment of the perfectly straight stream power supply of standby keyed jointing of ac power switch or remote controller the user, it is the transient state transition period that direct voltage rises from 0V, DC power supply is charged to two polar capacitors respectively, because their terminal voltage can not be suddenlyd change, DC power supply is being connected moment by described two divider resistance dividing potential drops, base stage at a described switch triode produces a pulse signal, make its base stage be in high level and saturation conduction, its collector electrode is that the output level is that 0V is a level "0", make the quiet pin level of sound accompaniment power amplification circuit chip become low level, be in mute state, the VGA CARD that the moment that prevents from effectively to start shooting sends.Starting shooting moment, to 0.7V, its emitter junction level is higher than the base stage level to the emitter of another switch triode by described clamping diode clamp, and another switch triode ends, and emitter junction and collector junction are high-impedance state, can not influence the operate as normal of sound accompaniment circuit.Be that described transient state transition period finishes after two polar capacitors are full of electricity, the base stage of a described switch triode is 0V, and it is ended, and also can not influence the operate as normal of sound accompaniment circuit;
The switch for the treatment of of pushing ac power switch or remote controller the user cuts off the shutdown moment of DC power supply; it is the transient state transition period that direct voltage drops to 0V; the terminal voltage of a described polar capacitor is passed through by a coupling resistance; the overcurrent protection diode; one emitter resistance; the discharge loop that another polar capacitor and another coupling resistance are formed discharges rapidly; both prevented effectively that the switch triode overcurrent from damaging; emitter at another switch triode produces a pulse signal again; make its level be lower than the base stage level and conducting; it is level "0" that the collector electrode level of another switch triode is close to 0V; make the quiet pin level of sound accompaniment power amplification circuit chip become low level; be in mute state, the shutdown noise that the moment that prevents from effectively to shut down sends.
Mute circuit for open and close of the present invention is compared with the prior art, and has the advantage novel, that circuit is simple, reliable and stable, particularly can eliminate the shutdown noise that is sent by loud speaker in shutdown moment of cutting off the electricity supply effectively.Every stereo set, electronic apparatus, IT product that is provided with the audio signal treatment system of the sound accompaniment power amplification circuit chip that adopts the band mute function can be used the present invention quiet processing is carried out in its switching on and shutting down.
Description of drawings
Below the contrast accompanying drawing and in conjunction with embodiment the invention will be further described.
Accompanying drawing is the circuit diagram of the embodiment of the invention.
Embodiment
A kind of mute circuit for open and close
Mute circuit for open and close as shown in the figure comprises the sound accompaniment power amplification circuit chip IC of the band mute function of audio signal treatment system.
The quiet pin of described sound accompaniment power amplification circuit chip IC is connected an output that the OR-NOT circuit of two inputs arranged, a described input is the pulse signal input terminal that transient state transition period that start moment direct voltage rises from 0V is produced by the inert element charging, and described another input is that shutdown moment direct voltage drops to the pulse signal input terminal of the transient state transition period of 0V by the inert element discharge generation.
The model that described OR-NOT circuit is interconnected to output by two collector electrodes is that switch triode Q1, the Q2 of H3904 forms;
The base stage of a described switch triode Q1 is an input of OR-NOT circuit, be connected with DC power supply+E with a polar capacitor C1 by a base bleederresistance R2, a coupling resistance R1, and emitter connects public ground, the parallel circuits that cross-over connection is made up of the overcurrent protection diode D1 by another a base bleederresistance R3 and a plus earth between the tie point of a described base bleederresistance R2 and a coupling resistance R1 and the public ground;
Described another switch triode Q2 is a NPN type triode, its base stage connects public ground, and emitter to be another input of OR-NOT circuit be connected with the positive pole of a DC power supply+E and a described polar capacitor C1 with another coupling resistance R4 by another polar capacitor C2, cross-over connection is by the parallel circuits of being made up of an emitter resistance R5 and an earthed-cathode clamping diode D2 between the emitter of described another switch triode Q2 and the public ground.
In non-switching on and shutting down moments, two inputs of described two switch triode Q1, Q2 are level "0", and its output is a level"1", and the quiet pin of sound accompaniment power amplification circuit chip IC is a high level, is in non-mute state;
Push the start moment of the perfectly straight stream power supply+E of standby keyed jointing of ac power switch or remote controller the user, it is the transient state transition period that direct voltage rises from 0V, DC power supply+E is respectively to two polar capacitor C1, C2 charges, because their terminal voltage can not be suddenlyd change, DC power supply+E is connecting moment by described two divider resistance R2, the R3 dividing potential drop, base stage at a described switch triode Q1 produces a pulse signal, make its base stage be in high level and saturation conduction, its collector electrode is that the output level is that 0.3V is a level "0", make the quiet pin level of sound accompaniment power amplification circuit chip IC become low level, be in mute state, the VGA CARD that the moment that prevents from effectively to start shooting sends.Starting shooting moment, the emitter level of another switch triode Q2 to 0.7V, is higher than the base stage level for 0V by described clamping diode D2 clamp, is in cut-off state, and emitter junction and collector junction are high-impedance state, can not influence the operate as normal of sound accompaniment circuit.Be that described transient state transition period finishes after two polar capacitor C1, C2 are full of electricity, the base stage of a described switch triode Q1 is 0V, is in cut-off state, and emitter junction and collector junction are high-impedance state, also can not influence the operate as normal of sound accompaniment circuit.
The switch for the treatment of of pushing ac power switch or remote controller the user cuts off the shutdown moment of DC power supply+E; it is the transient state transition period that direct voltage drops to 0V; the terminal voltage of a described polar capacitor C1 is passed through by a coupling resistance R1; overcurrent protection diode D1; Q1 emitter resistance R5; the discharge loop that another polar capacitor C2 and another coupling resistance R4 form discharges rapidly; both prevented effectively that the switch triode Q1 overcurrent from damaging; emitter at another switch triode Q2 produces a pulse signal again; make its level be lower than the base stage level and conducting; it is level "0" that the collector electrode level of another switch triode Q2 is close to 0V; make the quiet pin level of sound accompaniment power amplification circuit chip IC become low level; be in mute state, the shutdown noise that the moment that prevents from effectively to shut down sends.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (2)
1. mute circuit for open and close comprises it is characterized in that the sound accompaniment power amplification circuit chip of the band mute function of audio signal treatment system:
The quiet pin of described sound accompaniment power amplification circuit chip is connected an output that the OR-NOT circuit of two inputs arranged, a described input is the pulse signal input terminal that transient state transition period that start moment direct voltage rises from 0V is produced by the inert element charging, and described another input is that shutdown moment direct voltage drops to the pulse signal input terminal of the transient state transition period of 0V by the inert element discharge generation.
2. according to the described mute circuit for open and close of claim 1, it is characterized in that:
Described OR-NOT circuit is made up of the switch triode that two collector electrodes are interconnected to output;
The base stage of a described switch triode is an input of OR-NOT circuit, be connected with DC power supply by a base bleederresistance, a coupling resistance and a polar capacitor, and emitter connects public ground, and cross-over connection is by the parallel circuits of being made up of the overcurrent protection diode of another base bleederresistance and a plus earth between the tie point of a described base bleederresistance and a coupling resistance and the public ground;
Described another switch triode is a NPN type triode, its base stage connects public ground, and emitter to be another input of OR-NOT circuit be connected with the positive pole of another coupling resistance with a DC power supply and a described polar capacitor by another polar capacitor, cross-over connection is by the parallel circuits of being made up of an emitter resistance and an earthed-cathode clamping diode between the emitter of described another switch triode and the public ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510021799 CN1767607A (en) | 2005-09-27 | 2005-09-27 | Mute circuit for open and close |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510021799 CN1767607A (en) | 2005-09-27 | 2005-09-27 | Mute circuit for open and close |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1767607A true CN1767607A (en) | 2006-05-03 |
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ID=36743178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510021799 Pending CN1767607A (en) | 2005-09-27 | 2005-09-27 | Mute circuit for open and close |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1767607A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707477A (en) * | 2009-10-23 | 2010-05-12 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating impact sound generated in switching process |
| CN101257295B (en) * | 2007-03-01 | 2012-10-17 | 凌通科技股份有限公司 | Circuit with moderation variable wave shape to eliminate start and close popping noise |
| CN110323941A (en) * | 2018-03-30 | 2019-10-11 | 南宁富桂精密工业有限公司 | Low-power consumption standby circuit |
| CN115015618A (en) * | 2022-08-08 | 2022-09-06 | 深圳市恒运昌真空技术有限公司 | Radio frequency power supply signal acquisition method and device |
-
2005
- 2005-09-27 CN CN 200510021799 patent/CN1767607A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257295B (en) * | 2007-03-01 | 2012-10-17 | 凌通科技股份有限公司 | Circuit with moderation variable wave shape to eliminate start and close popping noise |
| CN101707477A (en) * | 2009-10-23 | 2010-05-12 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating impact sound generated in switching process |
| CN101707477B (en) * | 2009-10-23 | 2013-09-25 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating impact sound generated in switching process |
| CN110323941A (en) * | 2018-03-30 | 2019-10-11 | 南宁富桂精密工业有限公司 | Low-power consumption standby circuit |
| CN115015618A (en) * | 2022-08-08 | 2022-09-06 | 深圳市恒运昌真空技术有限公司 | Radio frequency power supply signal acquisition method and device |
| CN115015618B (en) * | 2022-08-08 | 2022-10-14 | 深圳市恒运昌真空技术有限公司 | Radio frequency power supply signal acquisition method and device |
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