CN104469622A - Circuit for eliminating power amplification impact sound - Google Patents
Circuit for eliminating power amplification impact sound Download PDFInfo
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- CN104469622A CN104469622A CN201410791352.3A CN201410791352A CN104469622A CN 104469622 A CN104469622 A CN 104469622A CN 201410791352 A CN201410791352 A CN 201410791352A CN 104469622 A CN104469622 A CN 104469622A
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Abstract
The invention discloses a circuit for eliminating power amplification impact sound. The circuit comprises a switch power supply circuit, a voltage stabilization circuit, a processor and an impact sound elimination circuit, wherein the switch power supply circuit is used for supplying power to a whole system, the voltage stabilization circuit is used for supplying power to the processor, the processor is used for outputting a MUTE_IN signal to control the output state of the impact sound elimination circuit, the impact sound elimination circuit is used for eliminating the power amplification impact sound, the circuit for eliminating the power amplification impact sound can effectively and reliably eliminate the impact sound generated when an audio device is turned on and turned off and the playing function and the muting function are switched, and meanwhile the power consumption can be effectively lowered and the energy conservation aim can be achieved; in addition, the circuit for eliminating the power amplification impact sound is simple in structure, convenient to use, safe and reliable.
Description
Technical field
The present invention relates to a kind of circuit eliminating power amplifier impulsive sound.
Background technology
Along with improving constantly of living standard, audio frequency apparatus is day by day relevant to the life of people.For most of audio frequency apparatus, its sonification system is that audio frequency small-signal signal source transmission come by audio-frequency power amplifier first exports to loud speaker again after process, amplification, is sounded by loud speaker vibrations.Thus, audio power amplifier circuit is most important for whole audio frequency apparatus, and its design often affects the effect of whole system.Audio frequency apparatus, in the moment of start, shutdown, due to the coupling of audio frequency power amplifier internal capacitance inductance, easily produces irregular audio signal and exports to loud speaker, thus send impulsive sound.In order to eliminate the impulsive sound that audio frequency apparatus produces instantaneously in start, shutdown, audio frequency apparatus generally adopts and makes audio frequency power amplifier be in the method for mute state in the moment of start, shutdown, and the circuit realizing this method is at present different, there is circuit complexity, high in cost of production problem, and audio frequency apparatus can not ensure minimum power consumption when not working.
For this reason, application number is the utility application of 201220116857.6, disclose a kind of power amplifier to power on silencing means, by adding muffling circuit between processor MCU and the quiet input interface of described power amplifying device, the shunt capacitance of muffling circuit is utilized to charge, thus the POPO sound eliminated when power amplifier powers on, but the POPO sound that it produces when cannot eliminate power amplifier power down, and the impulsive sound produced uncontrollable audio frequency apparatus carries out quiet real-time switching with playing and eliminates and switch during when normal operation.
In addition, Chinese patent ZL200910110236.X, disclose a kind of circuit eliminating impact sound generated in switching process, circuit is produced by switching voltage, output switch voltage signal goes to control start responding to switch circuit and shutdown responding to switch circuit, export effective mute signal MUTE, thus the impulsive sound that elimination audio frequency apparatus produces when startup and shutdown, its shortcoming is that uncontrollable audio frequency apparatus carries out the quiet real-time switching with playing when normal operation, namely cannot reach the effect reducing power consumption when power amplifier no-output.
Summary of the invention
For the defect existed in above-mentioned prior art, the object of this invention is to provide a kind of circuit eliminating power amplifier impulsive sound, this circuit not only can eliminate the impulsive sound that audio frequency apparatus produces when startup and shutdown, and audio frequency apparatus can be controlled carry out real-time switching that is quiet and that play when normal operation, reduce the power consumption of power amplifier when no-output.
For achieving the above object, a kind of circuit eliminating power amplifier impulsive sound of the present invention, this circuit comprise switching power circuit for powering for whole system, for power for processor voltage stabilizing circuit, eliminate the processor of impulsive sound circuit output state and the elimination impulsive sound circuit for eliminating power amplifier impulsive sound for exporting MUTE_IN signal to control, wherein:
Described elimination impulsive sound circuit contains the first resistance R1, the first triode Q1, the second resistance R2, the 3rd resistance 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; Wherein,
One end of described first resistance R1 exports MUTE_IN signal end with processor and is connected, and the other end is connected to the base stage of described first triode Q1;
The grounded emitter of described first triode Q1, the collector electrode of described first triode Q1 is connected to one end of described second resistance R2, described 3rd resistance R3, described 4th resistance R4 and described 7th resistance R7 respectively;
The other end of described second resistance R2 is connected to described switching power circuit;
The other end ground connection of described 3rd resistance R3;
The other end of described 7th resistance R7 is connected to the mute signal MUTE input of audio power amplifier circuit and one end of described first electric capacity C1 as mute signal MUTE output;
The other end ground connection of described first electric capacity C1;
The other end of described 4th resistance R4 is connected to the base stage of described second triode Q2;
The grounded emitter of described second triode Q2, the collector electrode of described second triode Q2 is connected to the cut-off signals SDZ input of audio power amplifier circuit as cut-off signals SDZ output, the collector electrode of described second triode Q2 is also connected to one end of described 5th resistance R5, described 6th resistance R6 respectively simultaneously;
The other end of described 5th resistance R5 is connected to described switching power circuit;
The other end ground connection of described 6th resistance R6.
Further, the output voltage of described switching power circuit is+12V.
Further, described first triode (Q1) and the second triode (Q2) are NPN transistor.
The circuit of elimination power amplifier impulsive sound provided by the invention not only can effectively, reliably eliminate audio frequency apparatus when switching on and shutting down, play and the quiet impulsive sound produced when switching, effectively can also reduce power consumption simultaneously, reach energy-conservation object, in addition, the circuit structure of elimination power amplifier impulsive sound of the present invention is simple, easy to use, and safe and reliable.
Accompanying drawing explanation
Fig. 1 is elimination power amplifier impulsive sound Circuits System theory structure block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of elimination power amplifier impulsive sound circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described.
As shown in Figure 1, a kind of circuit eliminating audio frequency power amplifier impulsive sound of the present invention, this main circuit will comprise Switching Power Supply input circuit, voltage stabilizing circuit, processor circuit, elimination impulsive sound circuit and audio power amplifier circuit.Wherein: preferably, the output voltage of Switching Power Supply input circuit is+12, and Switching Power Supply input circuit is voltage stabilizing circuit, eliminates impulsive sound circuit and audio power amplifier circuit and power; Preferably ,+3.3V the voltage that voltage stabilizing circuit produces is used for powering to processor, and the MUTE_IN signal exported by processor controls the output signal eliminating impulsive sound circuit.
In elimination impulsive sound circuit, the MUTE_IN signal exported by processor controls the output signal eliminating impulsive sound circuit, the cut-off signals SDZ and the mute signal MUTE that eliminate the output of impulsive sound circuit are connected to audio power amplifier circuit, ensure that audio frequency power amplifier is in mute state instantaneously in whole system startup and shutdown with this, eliminate startup and shutdown impulsive sound.Audio frequency apparatus, when whole system is normally run, also by processor ACTIVE CONTROL mute signal MUTE_IN, carries out the quiet real-time switching with playing.The object reducing power consumption is reached with this.
As shown in Figure 2, eliminate impulsive sound circuit and contain the first resistance R1, the first triode Q1, the second resistance R2, the 3rd resistance 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; Wherein, one end and the processor of the first resistance R1 export MUTE_IN signal end and are connected, and the other end is connected to the base stage of the first triode Q1; The grounded emitter of the first triode Q1, the collector electrode of the first triode Q1 is connected to one end of the second resistance R2, the 3rd resistance R3, described 4th resistance R4 and the 7th resistance R7 respectively; The other end of the second resistance R2 is connected to switching power circuit; The other end ground connection of the 3rd resistance R3; The other end of the 7th resistance R7 is connected to the mute signal MUTE input of audio power amplifier circuit and one end of the first electric capacity C1 as mute signal MUTE output; 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 collector electrode of the second triode Q2 is connected to the cut-off signals SDZ input of audio power amplifier circuit as cut-off signals SDZ output, the collector electrode of the second triode Q2 is also connected to one end of the 5th resistance R5, the 6th resistance R6 respectively simultaneously; The other end of the 5th resistance R5 is connected to switching power circuit; The other end ground connection of the 6th resistance R6; Wherein, the first triode (Q1) and the second triode (Q2) are NPN transistor.
When whole system starts, utilize the electrifying timing sequence of whole system, the impulsive sound problem of start can be solved; Specific implementation process is as follows:
System boot moment, because audio power amplifier circuit starts very fast, and now processor starts not yet completely, its GPIO mouth is in vacant state, i.e. MUTE_IN signal no-output, first triode Q1 ends, at divider resistance R2, under the effect of R3, S1 signal is by making the second triode Q2 conducting after the 4th resistance R4, after second triode Q2 conducting, cut-off signals SDZ exports as low level, and booting moment, the voltage difference at the first electric capacity C1 two ends can not be suddenlyd change, MUTE is low level, S1 signal starts to charge to the first electric capacity C1 by the 7th resistance R7, when to be charged to MUTE be high level to electric capacity C1, MUTE also can export effective mute signal, due to powered on moment, namely cut-off signals SDZ comes into force, although it is invalid to this ensures that there powered on moment mute signal MUTE, audio frequency power amplifier also can keep no-output state.Under cut-off signals SDZ and mute signal MUTE acting in conjunction, both ensure that audio frequency power amplifier was in mute state, and made again audio frequency power amplifier be in off state simultaneously, and then power consumption is reduced greatly.Carry out effectively reliably to eliminate with this impulsive sound that audio frequency apparatus produces at booting moment and reduce power consumption.
When processor normally runs, can ensure that MUTE_IN signal exports as high level (+3.3V) by its GPIO mouth, MUTE_IN signal is by making the first triode Q1 conducting after the first resistance R1, first triode Q1 collector electrode exports as low level, second triode Q2 ends, at divider resistance R5, under the effect of R6, SDZ signal exports as high level (being about+6V), cut-off signals SDZ is invalid, now because the voltage difference at the first electric capacity two ends can not be suddenlyd change, mute signal MUTE is effective, this ensures that there and make SDZ invalid under the effective prerequisite of mute signal MUTE, just can effectively eliminate audio frequency power amplifier by quiet be switched to broadcasting time the impulsive sound that produces, first electric capacity C1 is by the 7th resistance R7 and the first triode Q1 repid discharge subsequently, mute signal MUTE is allowed to become low level very soon.Now, at cut-off signals SDZ(high level) and mute signal MUTE(low level) under acting in conjunction, audio power amplifier circuit can normally export.With this come effectively reliably to eliminate audio frequency apparatus by quiet to play switch time generation impulsive sound and reduce power consumption.
When processor GPIO mouth exports as low level, namely MUTE_IN signal is low level, now the first triode Q1 ends, at divider resistance R2, under the effect of R3, S1 signal is by making the second triode Q2 conducting after the 4th resistance R4, after second triode Q2 conducting, cut-off signals SDZ exports as low level, and switch moment, the voltage difference at the first electric capacity C1 two ends can not be suddenlyd change, MUTE is low level, S1 signal starts to charge to the first electric capacity C1 by the 7th resistance R7, when being charged to MUTE and being high level, MUTE also can export effective mute signal, due to powered on moment, namely cut-off signals SDZ comes into force, although it is invalid to this ensures that there powered on moment mute signal MUTE, audio frequency power amplifier also can keep no-output state.Under cut-off signals SDZ and mute signal MUTE acting in conjunction, both ensure that audio frequency power amplifier was in mute state, and made again audio frequency power amplifier be in off state simultaneously, and then power consumption is reduced greatly.Carry out effectively reliably to eliminate audio frequency apparatus reducing power consumption by the impulsive sound produced when being played to quiet switching with this.
When whole system power-off, utilize the power-off sequential of whole system, the impulsive sound problem of shutdown can be solved equally.Specific implementation process is as follows:
System closedown moment, due to audio power amplifier circuit (electric capacity both end voltage difference can not be suddenlyd change) under the effect of bulky capacitor, and now processor has quit work, its GPIO mouth is in vacant state, i.e. MUTE_IN signal no-output, first triode Q1 ends, at divider resistance R2, under the effect of R3, S1 signal is by making the second triode Q2 conducting after the 4th resistance R4, after second triode Q2 conducting, cut-off signals SDZ exports as low level, and shutdown moment, the voltage difference at the first electric capacity C1 two ends can not be suddenlyd change, MUTE is low level, S1 signal starts to charge to the first electric capacity C1 by the 7th resistance R7, when being charged to MUTE and being high level, MUTE also can export effective mute signal, due to shutdown transient, namely cut-off signals SDZ comes into force, although it is invalid to this ensures that there shutdown transient mute signal MUTE, audio frequency power amplifier also can keep no-output state.Under cut-off signals SDZ and mute signal MUTE acting in conjunction, so both ensure that audio frequency power amplifier was in mute state, make again audio frequency power amplifier be in off state, the end until the bulky capacitor of audio power amplifier circuit discharges completely, whole system is just thoroughly closed simultaneously.Carry out effectively reliably to eliminate audio frequency apparatus with this and shut down the impulsive sound that produces instantaneously reduce power consumption.
In sum, the present invention can effectively reliably eliminate audio frequency apparatus when switching on and shutting down, play and the impulsive sound that produces during quiet switching, while effectively can also reduce power consumption.Global design be simple and easy to and safe and reliable.
It is more than the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. eliminate the circuit of power amplifier impulsive sound for one kind, this circuit comprise switching power circuit for powering for whole system, for power for processor voltage stabilizing circuit, eliminate the processor of impulsive sound circuit output state and the elimination impulsive sound circuit for eliminating power amplifier impulsive sound for exporting MUTE_IN signal to control, it is characterized in that:
Described elimination impulsive sound circuit contains the first resistance (R1), the first triode (Q1), the second resistance (R2), the 3rd resistance (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); Wherein,
One end of described first resistance (R1) exports MUTE_IN signal end with processor and is connected, and the other end is connected to the base stage of described first triode (Q1);
The grounded emitter of described first triode (Q1), the collector electrode of described first triode (Q1) is connected to one end of described second resistance (R2), described 3rd resistance (R3), described 4th resistance (R4) and described 7th resistance (R7) respectively;
The other end of described second resistance (R2) is connected to described switching power circuit;
The other end ground connection of described 3rd resistance (R3);
The other end of described 7th resistance (R7) is connected to the mute signal MUTE input of audio power amplifier circuit and one end of described first electric capacity (C1) as mute signal MUTE output;
The other end ground connection of described first electric capacity (C1);
The other end of described 4th resistance (R4) is connected to the base stage of described second triode (Q2);
The grounded emitter of described second triode (Q2), the collector electrode of described second triode (Q2) is connected to the cut-off signals SDZ input of audio power amplifier circuit as cut-off signals SDZ output, the collector electrode of described second triode (Q2) is also connected to one end of described 5th resistance (R5), described 6th resistance (R6) respectively simultaneously;
The other end of described 5th resistance (R5) is connected to described switching power circuit;
The other end ground connection of described 6th resistance (R6).
2. the circuit of elimination power amplifier impulsive sound according to claim 1, is characterized in that, the output voltage of described switching power circuit is+12V.
3. the circuit of elimination power amplifier impulsive sound according to claim 1, is characterized in that, described first triode (Q1) and the second triode (Q2) are NPN transistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410791352.3A CN104469622B (en) | 2014-12-19 | 2014-12-19 | A kind of circuit for eliminating power amplifier impulsive sound |
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| CN201410791352.3A CN104469622B (en) | 2014-12-19 | 2014-12-19 | A kind of circuit for eliminating power amplifier impulsive sound |
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| CN104469622B CN104469622B (en) | 2017-11-14 |
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| CN105263087A (en) * | 2015-11-18 | 2016-01-20 | 广东威创视讯科技股份有限公司 | Audio output circuit capable of eliminating startup and shutdown impact sound |
| CN107918982A (en) * | 2017-12-13 | 2018-04-17 | 北京智联弘盛科技发展有限公司 | Intelligent cash sales counter |
| CN111263268A (en) * | 2020-01-15 | 2020-06-09 | 深圳市创维群欣安防科技股份有限公司 | Loudspeaker POP sound cancelling circuit and electronic product during outage |
| CN116112846A (en) * | 2022-10-08 | 2023-05-12 | 广州市保伦电子有限公司 | Restarting impact sound eliminating circuit and audio circuit |
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| CN107918982A (en) * | 2017-12-13 | 2018-04-17 | 北京智联弘盛科技发展有限公司 | Intelligent cash sales counter |
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| CN116112846A (en) * | 2022-10-08 | 2023-05-12 | 广州市保伦电子有限公司 | Restarting impact sound eliminating circuit and audio circuit |
| 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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| CN104469622B (en) | 2017-11-14 |
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