CN104469622B - A kind of circuit for eliminating power amplifier impulsive sound - Google Patents
A kind of circuit for eliminating power amplifier impulsive sound Download PDFInfo
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- CN104469622B CN104469622B CN201410791352.3A CN201410791352A CN104469622B CN 104469622 B CN104469622 B CN 104469622B CN 201410791352 A CN201410791352 A CN 201410791352A CN 104469622 B CN104469622 B CN 104469622B
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Abstract
The invention discloses a kind of circuit for eliminating power amplifier impulsive sound, the circuit includes being used for the switching power circuit for whole system power supply, for the mu balanced circuit powered for processor, the processor for eliminating impulsive sound circuit output state and the elimination impulsive sound circuit for eliminating power amplifier impulsive sound are controlled for exporting MUTE_IN signals, wherein, the circuit for eliminating power amplifier impulsive sound not only can be effective, audio frequency apparatus is reliably eliminated in switching on and shutting down, broadcasting and impulsive sound caused by Jing Yin switching, power consumption can also be effectively reduced simultaneously, reach the purpose of energy-conservation, in addition, the circuit structure of the elimination power amplifier impulsive sound of the present invention is simple, it is easy to use, it is and safe and reliable.
Description
Technical field
The present invention relates to a kind of circuit for eliminating power amplifier impulsive sound.
Background technology
With the continuous improvement of living standard, audio frequency apparatus is increasingly related to the life of people.Set for most of audio
Standby, its sonification system is that the audio small-signal that signal source is transmitted to come is first passed through into processing, amplification by audio-frequency power amplifier
Export again to loudspeaker afterwards, sound is sent by loudspeaker vibrations.Thus, audio power amplifier circuit is for whole audio frequency apparatus to pass
Important, its design often influences the effect of whole system.Audio frequency apparatus start, shutdown moment, due to audio frequency power amplifier
The coupling of internal capacitance inductance, easily produce irregular audio signal and export to loudspeaker, so as to send impulsive sound.For
Elimination audio frequency apparatus typically makes in impulsive sound, audio frequency apparatus caused by start, shutdown moment using in the moment of start, shutdown
Audio frequency power amplifier is in the method for mute state, and realizes that the circuit of this method is different at present, circuit complexity, cost height etc. be present
Problem, and audio frequency apparatus cannot be guaranteed minimum power consumption when not working.
Therefore, the utility application of Application No. 201220116857.6, discloses electric noise reduction on a kind of power amplifier
Device, by adding muffling circuit between processor MCU and the Jing Yin input interface of the power amplifying device, utilize muffling circuit
Shunt capacitance is charged, POPO sounds during so as to eliminate electric on power amplifier, but it can not be eliminated caused by power amplifier power down
POPO sounds, and uncontrollable audio frequency apparatus carried out in normal operation it is Jing Yin with play real-time switching and eliminate switch when produce
Impulsive sound.
In addition, Chinese patent ZL200910110236.X, discloses a kind of circuit for eliminating impact sound generated in switching process, by opening
Voltage generation circuit is closed, output switch voltage signal goes control start responding to switch circuit and shutdown responding to switch circuit, output
Effective mute signal MUTE, so as to eliminate audio frequency apparatus in impulsive sound caused by startup and shutdown, its shortcoming is can not
Control audio frequency apparatus carries out the Jing Yin real-time switching with broadcasting in normal operation, that is, be unable to reach reduces when power amplifier is without output
The effect of power consumption.
The content of the invention
For defect present in above-mentioned prior art, it is an object of the invention to provide a kind of electricity for eliminating power amplifier impulsive sound
Road, the circuit can not only eliminate audio frequency apparatus in impulsive sound caused by startup and shutdown, and audio frequency apparatus can be controlled to exist
The Jing Yin real-time switching with broadcasting is carried out during normal operation, reduces power consumption of power amplifier when without output.
To achieve the above object, the circuit of a kind of elimination power amplifier impulsive sound of the invention, it is whole that the circuit, which includes being used for,
The switching power circuit of system power supply, for powered for processor mu balanced circuit, disappear to control for exporting MUTE_IN signals
Elimination impulsive sound circuit except the processor of impulsive sound circuit output state and for eliminating power amplifier impulsive sound, wherein：
It is described elimination impulsive sound circuit contain first resistor R1, the first triode Q1, second resistance R2,3rd resistor R3,
4th resistance R4, the second triode Q2, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the first electric capacity C1；Wherein,
One end of the first resistor R1 and processor output MUTE_IN signal ends are connected, and the other end is connected to described the
One triode Q1 base stage；
The grounded emitter of the first triode Q1, the colelctor electrode of the first triode Q1 are respectively connecting to described
Two resistance R2, the 3rd resistor R3, the 4th resistance R4 and the 7th resistance R7 one end；
The other end of the second resistance R2 is connected to the switching power circuit；
The other end ground connection of the 3rd resistor R3；
The other end of the 7th resistance R7 is connected to the Jing Yin of audio power amplifier circuit as mute signal MUTE output ends
One end of signal MUTE inputs and the first electric capacity C1；
The other end ground connection of the first electric capacity C1；
The other end of the 4th resistance R4 is connected to the base stage of the second triode Q2；
The grounded emitter of the second triode Q2, the colelctor electrode of the second triode Q2 is as cut-off signals SDZ
Output end is connected to the cut-off signals SDZ inputs of audio power amplifier circuit, while the colelctor electrode of the second triode Q2 also divides
The 5th resistance R5, one end of the 6th resistance R6 are not connected to；
The other end of the 5th resistance R5 is connected to the switching power circuit；
The other end ground connection of the 6th resistance R6.
Further, the output voltage of the switching power circuit is+12V.
Further, first triode（Q1）With the second triode（Q2）It is NPN transistor.
The circuit provided by the invention for eliminating power amplifier impulsive sound not only can effectively and reliably eliminate audio frequency apparatus and switch
During machine, play with Jing Yin switching caused by impulsive sound, while power consumption can also be effectively reduced, reach the purpose of energy-conservation, this
Outside, the circuit structure of elimination power amplifier impulsive sound of the invention is simple, easy to use, and securely and reliably.
Brief description of the drawings
Fig. 1 is the elimination power amplifier impulsive sound circuit system theory structure block diagram of the present invention；
Fig. 2 is the circuit theory diagrams of the elimination power amplifier impulsive sound circuit of the present invention.
Embodiment
The explanation present invention below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of circuit of elimination audio frequency power amplifier impulsive sound of the present invention, the circuit mainly include Switching Power Supply
Input circuit, mu balanced circuit, processor circuit, elimination impulsive sound circuit and audio power amplifier circuit.Wherein：Preferably, switch
The output voltage of power supply input circuit is+12, and Switching Power Supply input circuit is mu balanced circuit, eliminates impulsive sound circuit and audio
Power amplifier is powered；Preferably ,+3.3V voltages caused by mu balanced circuit are used to power to processor, are exported by processor
MUTE_IN signals eliminate the output signal of impulsive sound circuit to control.
In impulsive sound circuit is eliminated, the MUTE_IN signals exported by processor eliminate impulsive sound circuit to control
Output signal, the cut-off signals SDZ and mute signal MUTE for eliminating impulsive sound circuit output are connected to audio power amplifier circuit, with this
To ensure that audio frequency power amplifier is in mute state in whole system startup and shutdown moment, startup and shutdown impulsive sound is eliminated.Audio
Equipment can also be carried out Jing Yin with playing in whole system normal operation by processor active control mute signal MUTE_IN
Real-time switching.Reach the purpose of reduction power consumption with this.
As shown in Fig. 2 eliminating impulsive sound circuit contains first resistor R1, the first triode Q1, second resistance R2, the 3rd electricity
Hinder R3, the 4th resistance R4, the second triode Q2, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the first electric capacity C1；Its
In, first resistor R1 one end is connected with processor output MUTE_IN signal ends, and the other end is connected to the first triode Q1 base
Pole；First triode Q1 grounded emitter, the first triode Q1 colelctor electrode are respectively connecting to second resistance R2,3rd resistor
R3, the 4th resistance R4 and the 7th resistance R7 one end；The second resistance R2 other end is connected to switching power circuit；3rd
Resistance R3 other end ground connection；The 7th resistance R7 other end is connected to audio power amplifier circuit as mute signal MUTE output ends
Mute signal MUTE inputs and the first electric capacity C1 one end；First electric capacity C1 other end ground connection；4th resistance R4's is another
One end is connected to the second triode Q2 base stage；Second triode Q2 grounded emitter, the second triode Q2 colelctor electrode are made
The cut-off signals SDZ inputs of audio power amplifier circuit, while the second triode Q2 collection are connected to for cut-off signals SDZ output ends
Electrode is further connected to the 5th resistance R5, the 6th resistance R6 one end；The 5th resistance R5 other end is connected to Switching Power Supply
Circuit；6th resistance R6 other end ground connection；Wherein, the first triode（Q1）With the second triode（Q2）It is NPN type crystal
Pipe.
When whole system starts, using the electrifying timing sequence of whole system, can solve the problems, such as the impulsive sound of start；Specifically
Implementation process is as follows：
System boot moment, because audio power amplifier circuit starts comparatively fast, and now processor not yet starts completely, its GPIO
Mouth be in vacant state, i.e. without output, the first triode Q1 ends MUTE_IN signals, in the presence of divider resistance R2, R3,
S1 signals are by turning on the second triode Q2 after the 4th resistance R4, after the second triode Q2 conductings, cut-off signals SDZ outputs
For low level, and booting moment, the voltage difference at the first electric capacity C1 both ends will not be mutated, and MUTE is low level, and S1 signals pass through
Seven resistance R7 start to charge to the first electric capacity C1, and when it is high level that electric capacity C1, which is charged to MUTE, MUTE can also export effective quiet
Sound signal, due to powered on moment, cut-off signals SDZ i.e. come into force, although so ensure that powered on moment mute signal MUTE without
Effect, audio frequency power amplifier can also keep without output state.Under cut-off signals SDZ and mute signal MUTE collective effects, both it ensure that
Audio frequency power amplifier is in mute state, while audio frequency power amplifier is off state again, and then greatly reduces power consumption.Have with this
Effect, which reliably eliminates audio frequency apparatus, in impulsive sound caused by booting moment and reduces power consumption.
When processor normal operation, it can ensure that MUTE_IN signal outputs are high level by its GPIO mouth（+
3.3V）, by turning on the first triode Q1 after first resistor R1, the output of the first triode Q1 colelctor electrodes is MUTE_IN signals
Low level, the second triode Q2 cut-offs, in the presence of divider resistance R5, R6, SDZ signal outputs are high level（About+6V）,
Cut-off signals SDZ is invalid, and now because the voltage difference at the first electric capacity both ends will not be mutated, mute signal MUTE is effective, thus
Ensure that makes SDZ invalid under the premise of mute signal MUTE is effective, just can effectively eliminate audio frequency power amplifier and be broadcast by Jing Yin be switched to
Put caused impulsive sound, subsequent first electric capacity C1 allows Jing Yin letter by the 7th resistance R7 and the first triode Q1 repid discharges
Number MUTE quickly becomes low level.Now, in cut-off signals SDZ（High level）With mute signal MUTE（Low level）Collective effect
Under, audio power amplifier circuit can be exported normally.With this come effectively and reliably eliminate audio frequency apparatus by it is Jing Yin to play switch when
Caused impulsive sound simultaneously reduces power consumption.
When the output of processor GPIO mouths is low level, i.e., MUTE_IN signals are low level, and now the first triode Q1 is cut
Only, in the presence of divider resistance R2, R3, S1 signals are by turning on the second triode Q2 after the 4th resistance R4, the two or three pole
After pipe Q2 conductings, cut-off signals SDZ outputs are low level, and switch moment, and the voltage difference at the first electric capacity C1 both ends will not dash forward
Become, MUTE is low level, and S1 signals start to charge to the first electric capacity C1 by the 7th resistance R7, are high level when being charged to MUTE
When, MUTE can also export effective mute signal, and due to powered on moment, cut-off signals SDZ comes into force, although so ensuring that
Powered on moment mute signal MUTE is invalid, and audio frequency power amplifier can also keep without output state.In cut-off signals SDZ and mute signal
It under MUTE collective effects, both ensure that audio frequency power amplifier was in mute state, while audio frequency power amplifier is off state again, and then
Greatly reduce power consumption.Audio frequency apparatus is effectively and reliably eliminated impulsive sound is simultaneously as caused by being played to Jing Yin switching with this
Reduce power consumption.
When whole system powers off, using the power-off sequential of whole system, can equally solve the problems, such as the impulsive sound of shutdown.
Specific implementation process is as follows：
System closedown moment, because audio power amplifier circuit is in the presence of bulky capacitor（Electric capacity both end voltage difference will not dash forward
Become）, and now processor has been stopped, its GPIO mouth is in vacant state, i.e., MUTE_IN signals are without output, the one or three pole
Pipe Q1 ends, and in the presence of divider resistance R2, R3, S1 signals are by turning on the second triode Q2 after the 4th resistance R4, and the
After two triode Q2 conductings, cut-off signals SDZ outputs are low level, and shutdown moment, the voltage difference at the first electric capacity C1 both ends
It will not be mutated, MUTE is low level, and S1 signals start to charge to the first electric capacity C1 by the 7th resistance R7, is height when being charged to MUTE
During level, MUTE can also export effective mute signal, and due to shutdown transient, cut-off signals SDZ comes into force, and so ensures that
Although shutdown transient mute signal MUTE is invalid, audio frequency power amplifier can also keep without output state.In cut-off signals SDZ and Jing Yin letter
Under number MUTE collective effects, it so both ensure that audio frequency power amplifier was in mute state, while audio frequency power amplifier is off shape again
State, terminate until the bulky capacitor of audio power amplifier circuit discharges completely, whole system is just thoroughly closed.Effectively and reliably disappeared with this
Except audio frequency apparatus in impulsive sound caused by shutdown moment and reduces power consumption.
In summary, the present invention can effectively and reliably eliminate audio frequency apparatus in switching on and shutting down, play with Jing Yin switching when
Caused impulsive sound, while power consumption can also be effectively reduced.Global design is easy to use and safe and reliable.
Above is the preferred embodiment of the present invention, it is noted that for those skilled in the art,
Under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should be regarded as this
The protection domain of invention.
Claims (2)
1. a kind of circuit for eliminating power amplifier impulsive sound, the circuit includes being used for the switching power circuit for whole system power supply, used
In the mu balanced circuit powered for processor, for export MUTE_IN signals control eliminate impulsive sound circuit output state place
Manage device and the elimination impulsive sound circuit for eliminating power amplifier impulsive sound, it is characterised in that：
The elimination impulsive sound circuit contains first resistor（R1）, the first triode（Q1）, second resistance（R2）, 3rd resistor
（R3）, the 4th resistance（R4）, the second triode（Q2）, the 5th resistance（R5）, the 6th resistance（R6）, the 7th resistance（R7）With first
Electric capacity（C1）；Wherein,
The first resistor（R1）One end and processor output MUTE_IN signal ends be connected, the other end is connected to described first
Triode（Q1）Base stage；
First triode（Q1）Grounded emitter, first triode（Q1）Colelctor electrode be respectively connecting to described
Two resistance（R2）, the 3rd resistor（R3）, the 4th resistance（R4）With the 7th resistance（R7）One end；
The second resistance（R2）The other end be connected to the switching power circuit；
The 3rd resistor（R3）The other end ground connection；
7th resistance（R7）The other end the Jing Yin letter of audio power amplifier circuit is connected to as mute signal MUTE output ends
Number MUTE inputs and first electric capacity（C1）One end；
First electric capacity（C1）The other end ground connection；
4th resistance（R4）The other end be connected to second triode（Q2）Base stage；
Second triode（Q2）Grounded emitter, second triode（Q2）Colelctor electrode as cut-off signals SDZ
Output end is connected to the cut-off signals SDZ inputs of audio power amplifier circuit, while the colelctor electrode of second triode (Q2) is also
It is respectively connecting to the 5th resistance (R5), one end of the 6th resistance (R6)；
The other end of 5th resistance (R5) is connected to the switching power circuit；
The other end ground connection of 6th resistance (R6)；
First triode（Q1）With the second triode（Q2）It is NPN transistor.
2. it is according to claim 1 eliminate power amplifier impulsive sound circuit, it is characterised in that the switching power circuit it is defeated
It is+12V to go out voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410791352.3A CN104469622B (en) | 2014-12-19 | 2014-12-19 | A kind of circuit for eliminating power amplifier impulsive sound |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410791352.3A CN104469622B (en) | 2014-12-19 | 2014-12-19 | A kind of circuit for eliminating power amplifier impulsive sound |
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| CN104469622A CN104469622A (en) | 2015-03-25 |
| CN104469622B true CN104469622B (en) | 2017-11-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105263087B (en) * | 2015-11-18 | 2020-01-10 | 广东威创视讯科技股份有限公司 | Audio output circuit for eliminating startup and shutdown impact sound |
| CN107918982B (en) * | 2017-12-13 | 2020-06-02 | 北京智联弘盛科技发展有限公司 | Intelligent cash counter |
| CN111263268B (en) * | 2020-01-15 | 2022-02-01 | 深圳创维数字技术有限公司 | Loudspeaker POP sound cancelling circuit and electronic product during outage |
| CN116112846B (en) * | 2022-10-08 | 2024-01-30 | 广东保伦电子股份有限公司 | Restarting impact sound eliminating circuit and audio circuit |
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| CN201044477Y (en) * | 2007-06-06 | 2008-04-02 | 深圳创维－Rgb电子有限公司 | Circuit for preventing impulsive sound when starting or shutting off TV set and TV set thereof |
| 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 |
| CN204259144U (en) * | 2014-12-19 | 2015-04-08 | 北京卓越信通电子股份有限公司 | A kind of circuit eliminating power amplifier impulsive sound |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI320996B (en) * | 2006-07-06 | 2010-02-21 | Tatung Co | Pop sound prevention module and speaker apparatus thereof |
| US8340320B2 (en) * | 2008-11-25 | 2012-12-25 | Mediatek Inc. | Mute circuits |
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Patent Citations (3)
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|---|---|---|---|---|
| CN201044477Y (en) * | 2007-06-06 | 2008-04-02 | 深圳创维－Rgb电子有限公司 | Circuit for preventing impulsive sound when starting or shutting off TV set and TV set thereof |
| 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 |
| CN204259144U (en) * | 2014-12-19 | 2015-04-08 | 北京卓越信通电子股份有限公司 | A kind of circuit eliminating power amplifier impulsive sound |
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