CN106303834A - Mute control device and method of power amplification system - Google Patents
Mute control device and method of power amplification system Download PDFInfo
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- CN106303834A CN106303834A CN201610900383.7A CN201610900383A CN106303834A CN 106303834 A CN106303834 A CN 106303834A CN 201610900383 A CN201610900383 A CN 201610900383A CN 106303834 A CN106303834 A CN 106303834A
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- resistance
- audion
- power amplification
- amplification system
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- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
Abstract
The invention discloses a mute control device and a method of a power amplifier system, wherein the power amplifier system comprises a receiving circuit for receiving a mute control signal, and the mute control device of the power amplifier system comprises: the zero-crossing detection circuit is used for carrying out zero-crossing detection on the audio signal output to the loudspeaker by the power amplification system when the receiving circuit receives the mute control signal and outputting a zero-crossing signal when the zero-crossing point of the audio signal output to the loudspeaker by the power amplification system is detected; and the mute control circuit is used for carrying out mute control on the power amplification system according to the mute control signal received by the receiving circuit when the zero-crossing signal is received. The technical scheme of the invention can eliminate the explosion sound generated when the power amplification system is subjected to mute operation.
Description
Technical field
The present invention relates to power amplification system audio signal processing technique field, particularly to the mute control device of a kind of power amplification system
And method.
Background technology
Power amplification system, it is simply that the audio signal of input is carried out power amplification process and exports to loudspeaker, to promote loudspeaker
Sounding.
The existing quiet control to power amplification system is exactly: in power amplification system work process, turns off the defeated of power amplification system
Go out.But, when turning off the output of power amplification system, the voltage being added in loudspeaker two ends can produce sudden change, thus on horn coil
Produce the sudden change of electric current, form mutation effect power, cause loudspeaker to send explosion sound.
Summary of the invention
The main object of the present invention is to provide the mute control device of a kind of power amplification system, it is intended to eliminate to enter power amplification system
Produced explosion sound during row mute operation.
For achieving the above object, the mute control device that the present invention proposes includes zero cross detection circuit, for connecing described
When receipts circuit receives quiet control signal, the audio signal of power amplification system output to loudspeaker is carried out zero passage detection, and in inspection
Measure output zero cross signal when described power amplification system exports the audio signal zero crossing to loudspeaker；Muting control circuit, is used for
When receiving described zero cross signal, according to the described quiet control signal that described reception circuit receives, described power amplification system is carried out
Quiet control.
Preferably, described zero cross detection circuit includes comparing unit, the in-phase input end of described comparing unit and described loudspeaker
Positive pole connects, and the inverting input of described comparing unit is connected with the negative pole of described loudspeaker, the output of described comparing unit
End is used for exporting described zero cross signal.
Preferably, described comparing unit includes the first audion and the second audion, the emitter stage of described first audion
Being connected with the base stage of described second audion, it connects the in-phase input end that node is described comparing unit；Described one or three pole
The base stage of pipe is connected with the emitter stage of described second audion, and it connects the inverting input that node is described comparing unit；Institute
The colelctor electrode of the colelctor electrode and described second audion of stating the first audion is connected, and it connects node is the defeated of described comparing unit
Go out end.
Preferably, described zero cross detection circuit also includes filter unit, and the first input end of described filter unit is with described
The positive pole of loudspeaker connects, and the second input of described filter unit is connected with the negative pole of described loudspeaker；The of described filter unit
One outfan is connected with the in-phase input end of described comparing unit, the second outfan of described filter unit and described comparing unit
Inverting input connect.
Preferably, described filter unit includes the first resistance, the second resistance and the first electric capacity, the first of described first resistance
End is the first input end of described filter unit, and the second end of described first resistance is connected with the first end of described first electric capacity,
It connects the first outfan that node is described filter unit；The first end is described filter unit the second of described second resistance
Input, the second end of described second resistance is connected with the second end of described first electric capacity, and it connects node is that described filtering is single
Second outfan of unit.
Preferably, described muting control circuit includes interlocking unit and output unit, the input of described interlocking unit, institute
Stating the outfan of interlocking unit and the input interconnection of described output unit, the outfan of described output unit is used for output mute
Control signal.
Preferably, described interlocking unit includes the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 3rd switch
Pipe, the 4th switching tube and the first quiet control signal input；The base stage of described 3rd audion, the second of described 3rd resistance
End and the first end interconnection of described 4th resistance, the input that the first end is described interlocking unit of described 3rd resistance；Described
First end interconnection of the colelctor electrode of the 3rd audion, the second end of described 5th resistance and described 6th resistance, described 5th electricity
First end of resistance is connected with described first quiet control signal input；Second end of described 6th resistance and described four or three pole
The base stage of pipe connects, and the colelctor electrode of described 4th audion is connected with the first end of described 3rd resistance, and it connects node is institute
State the outfan of interlocking unit；Second end of described 4th resistance, the emitter stage of described 3rd switching tube and described 4th switch
The grounded emitter of pipe.
Preferably, described interlocking unit also includes the second electric capacity, the first end of described second electric capacity, described 4th audion
Colelctor electrode and the second end interconnection of described 3rd resistance, it connects node is the outfan of described interlocking unit, described second
Second end ground connection of electric capacity.
Preferably, described output unit includes the 7th resistance, the 8th resistance, the 5th audion and the second quiet control signal
Input, the base stage of described 5th audion is connected with the second end of described 7th resistance, and the first end of described 7th resistance is
The input of described output unit；The colelctor electrode of described 5th audion is connected with the second end of described 8th resistance, and it connects
Node is the outfan of described output unit, and the first end of described 8th resistance is with described second quiet control signal input even
Connect, the grounded emitter of described 5th audion.
Accordingly, the present invention also proposes the mute control method of a kind of power amplification system, comprises the following steps:
When receiving quiet control signal, the audio signal of power amplification system output to loudspeaker is carried out zero passage detection, and
Zero cross signal is exported when described power amplification system exports the audio signal zero crossing to loudspeaker detecting；
Receive described zero cross signal time, according to described reception circuit receive described quiet control signal to described power amplifier
System carries out quiet control.
Technical solution of the present invention by use zero cross detection circuit receive circuit receive quiet control signal time, to merit
Place system output carries out zero passage detection to the audio signal of loudspeaker, and the power amplification system output audio signal to loudspeaker detected
During zero crossing, output zero cross signal is to muting control circuit, so that muting control circuit is according to receiving the quiet control that circuit receives
Signal carries out quiet control to power amplification system.Owing to when the audio signal zero crossing of power amplification system output to loudspeaker, loudspeaker are just
The voltage of pole and the voltage of negative pole are almost equal, and power amplification system is close to zero output state, therefore, use technical solution of the present invention pair
When power amplification system carries out quiet action, loudspeaker will not send explosion sound.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram of mute control device one embodiment of power amplification system of the present invention；
Fig. 2 is the audio signal of loudspeaker positive pole input, the audio signal of loudspeaker negative pole input and the sound of power amplification system output
Frequently the comparison of wave shape figure of signal.
Fig. 3 is the electrical block diagram of mute control device one embodiment of power amplification system of the present invention；
Fig. 4 is the schematic flow sheet of mute control method one embodiment of power amplification system of the present invention.
Drawing reference numeral illustrates:
| Label | Title | Label | Title | Label | Title |
| 100 | Zero cross detection circuit | Q1 | First switching tube | R1 | First resistance |
| 200 | Muting control circuit | Q2 | Second switch pipe | R2 | Second resistance |
| 110 | Comparing unit | Q3 | 3rd switching tube | R3 | 3rd resistance |
| 120 | Filter unit | Q4 | 4th switching tube | R4 | 4th resistance |
| 210 | Interlocking unit | Q5 | 5th switching tube | R5 | 5th resistance |
| 220 | Output unit | R8 | 8th resistance | R6 | 6th resistance |
| R7 | 7th resistance |
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under not making creative work premise all its
His embodiment, broadly falls into the scope of protection of the invention.
If it is to be appreciated that directional instruction in the embodiment of the present invention (such as up, down, left, right, before and after ...), then
It is only used for explanation relative position relation under a certain particular pose (as shown in drawings) between each parts, motion conditions etc., as
When really this particular pose changes, then directionality instruction changes the most therewith.
It addition, the description relating to " first ", " second " etc. in the present invention is only used for describing purpose, and it is not intended that refer to
Show or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", "
Two " feature can express or implicitly include at least one this feature.It addition, the technical scheme between each embodiment can
To be combined with each other, but must be based on those of ordinary skill in the art are capable of, when the combination of technical scheme occurs
Conflicting will be understood that the combination of this technical scheme does not exists, the most not at the protection model of application claims when maybe cannot realize
Within enclosing.
The present invention proposes the mute control device of a kind of power amplification system.Wherein, power amplification system includes for receiving quiet control
The reception circuit of signal processed.
With reference to Fig. 1, in one embodiment, the mute control device of this power amplification system includes zero cross detection circuit 100 and quiet
Sound control circuit 200.
Wherein, zero cross detection circuit 100, for when receiving circuit (not shown) and receiving quiet control signal, right
Power amplification system (not shown) output carries out zero passage detection to the audio signal of loudspeaker (not shown), and power amplifier system detected
Output zero cross signal when system exports the audio signal zero crossing to loudspeaker；
With reference to Fig. 2, in Fig. 2, L1 is the waveform of the audio signal of loudspeaker positive pole P1 input, and L2 is loudspeaker negative pole P2 input
The waveform of audio signal, L3 is the waveform of the audio signal of power amplification system output.
In 0～t1 time period, the voltage of the voltage ratio negative pole P2 of loudspeaker positive pole P1 is high, to the t1 moment, loudspeaker positive pole P1's
Voltage is equal with the voltage of negative pole P2.Moment before time tl, or moment after instant tl, connect if receiving circuit
Receive quiet control signal, then zero cross detection circuit 100 exports zero cross signal；Otherwise, zero cross detection circuit 100 does not export zero passage
Signal.
In t1～the t2 time period, the voltage of the voltage ratio positive pole P1 of loudspeaker negative pole P2 is high, to the t2 moment, loudspeaker negative pole P2's
Voltage is equal with the voltage of positive pole P1.Moment before the t2 moment, or moment after instant t 2, connect if receiving circuit
Receive quiet control signal, then zero cross detection circuit 100 exports zero cross signal；Otherwise, zero cross detection circuit 100 does not export zero passage
Signal.
It should be noted that the cycle that the power amplification system shown in Fig. 2 exports the oscillogram to loudspeaker is t2, hereafter, to appointing
Anticipate a tx moment, if the positive pole P1 voltage of loudspeaker is equal with negative pole P2 voltage, then before tx in a flash or after in a flash,
If receiving circuit to receive quiet control signal, then zero cross detection circuit 100 exports zero cross signal；Otherwise, zero cross detection circuit
100 do not export zero cross signal.
Wherein, muting control circuit 200, for when receiving zero cross signal, according to receiving the quiet control that circuit receives
Signal processed carries out quiet control to power amplification system.
Muting control circuit 200, when receiving zero cross signal, controls to receive the quiet control signal life that circuit receives
Effect, it is achieved the quiet control to power amplification system.
It is understood that when the audio signal zero crossing of power amplification system output to loudspeaker, the voltage of loudspeaker positive pole P1
Almost equal with the voltage of negative pole P2, power amplification system is close to zero output state, now, if power amplification system is carried out quiet action,
Then loudspeaker will not send explosion sound.Therefore, technical solution of the present invention can eliminate and be produced when power amplification system is carried out quiet action
Raw explosion sound.
Technical solution of the present invention by use zero cross detection circuit 100 receive circuit receive quiet control signal time,
The audio signal of power amplification system output to loudspeaker is carried out zero passage detection, and the power amplification system output audio frequency to loudspeaker detected
During signal zero crossing, output zero cross signal is to muting control circuit 200, so that muting control circuit 200 receives according to receiving circuit
Quiet control signal power amplification system is carried out quiet control.Due to the audio signal zero crossing in power amplification system output to loudspeaker
Time, the voltage of loudspeaker positive pole P1 and the voltage of negative pole P2 are almost equal, and power amplification system is close to zero output state, therefore, use this
When inventive technique scheme carries out quiet action to power amplification system, loudspeaker will not send explosion sound.
Preferably, with reference to Fig. 3, above-mentioned zero cross detection circuit 100 includes comparing unit 110, and the homophase of comparing unit 110 is defeated
Entering end to be connected with the positive pole P1 of loudspeaker, the inverting input of comparing unit 110 is connected with the negative pole P2 of loudspeaker, comparing unit 100
Outfan be used for exporting zero cross signal.
It should be noted that comparing unit 110 is internal has reference voltage, when the audio frequency of power amplification system output to loudspeaker is believed
During number zero passage, comparing unit 110 in-phase input end voltage and inverting input difference in voltage are less than the base within comparing unit 110
Quasi-voltage, comparing unit 110 exports zero cross signal；Power amplification system output to before the audio signal zero passage of loudspeaker or it
After, comparing unit 110 in-phase input end voltage and inverting input difference in voltage are more than the benchmark electricity within comparing unit 110
Pressure, comparing unit 110 does not export zero cross signal.
It is noted that the implementation of comparing unit 110 internal reference voltage has multiple, such as, by voltage stabilizing two pole
Pipe (not shown) realizes, if the voltage stabilizing value of Zener diode is different, then corresponding reference voltage value is the most different, and voltage stabilizing two pole
The voltage stabilizing value of pipe is the least, and the reliability of the zero cross signal of zero cross detection circuit 100 output is the highest.Or, by audion, (figure is not
Illustrate) realize, when audion saturation conduction, the pressure drop between its base stage and emitter stage is stable at about 0.7V, corresponding base
Quasi-magnitude of voltage is 0.7V.The implementation of comparing unit 110 internal reference voltage does not limits.
With reference to Fig. 3, in one embodiment, above-mentioned comparing unit 110 includes the first audion Q1 and the second audion
The emitter stage of Q2, the first audion Q1 and the base stage of the second audion Q2 connect, and it connects the homophase that node is comparing unit 110
Input；The base stage of the first audion Q1 is connected with the emitter stage of the second audion Q2, and it connects node is comparing unit 110
Inverting input；The colelctor electrode of the first audion Q1 and the colelctor electrode of the second audion Q2 connect, and it connects node for the most single
The outfan of unit 110.
In power amplification system work process, when the difference of voltage of voltage and negative pole P2 at loudspeaker positive pole P1 that falls is more than the
During the cut-in voltage of one audion Q1, the first audion Q1 conducting, the second audion Q2 cut-off, the electricity of comparing unit 110 output
Pressure value is close to the voltage fallen at loudspeaker positive pole P1.When the difference of voltage of voltage and positive pole P1 at loudspeaker negative pole P2 that falls is more than the
During the cut-in voltage of two audion Q2, the second audion Q2 conducting, the first audion Q1 cut-off, the electricity of comparing unit 110 output
Pressure value is close to the voltage fallen at loudspeaker negative pole P2.When the difference of voltage of voltage and negative pole P2 at loudspeaker positive pole P1 that falls is less than the
The cut-in voltage of one audion Q1, and the difference of voltage of voltage and positive pole P1 at loudspeaker negative pole P2 that falls is less than the second audion
During the cut-in voltage of Q2, the first audion Q1 cut-off, the second audion Q2 cut-off, the magnitude of voltage of the output of comparing unit 110 is
Zero.
The present embodiment using the pressure drop between the first audion Q1 and the base stage of the second audion Q2 and emitter stage as comparing
The internal reference voltage of unit, circuit structure is simple, and the zero cross signal of output is reliable.
Further, with reference to Fig. 3, above-mentioned zero cross detection circuit 100 also includes filter unit 120, the of filter unit 120
One input is connected with the positive pole P1 of loudspeaker, and the second input of filter unit 120 is connected with the negative pole P2 of loudspeaker；Filter unit
First outfan of 120 is connected with the in-phase input end of comparing unit 110, the second outfan of filter unit 120 with compare single
The inverting input of unit 110 connects.
In the present embodiment, filter unit 120 is for filtering the HFS signal of power amplification system output.Especially, merit is worked as
When place system is digital power amplifier system, the HFS signal of power amplification system output includes the pwm signal of digital power amplifier system.
With reference to Fig. 3, in one embodiment, above-mentioned filter unit 120 includes the first resistance R1, the second resistance R2 and the
The first input end that first end is filter unit 120 of one electric capacity C1, the first resistance R1, second end and first of the first resistance R1
First end of electric capacity C1 connects, and it connects the first outfan that node is filter unit 120；First end of the second resistance R2 is filter
Second input of ripple unit 120, second end of the second resistance R2 and second end of the first electric capacity C1 connect, and its connection node is
Second outfan of filter unit 120.
Preferably, with reference to Fig. 3, above-mentioned muting control circuit includes interlocking unit 210 and output unit 220, interlocking unit
The input interconnection of input, the outfan of interlocking unit 210 and the output unit 220 of 210, the outfan of output unit 220
For output mute control signal.
When receiving circuit and receiving quiet control signal, if the input of interlocking unit 210 receives zero cross signal, one
Aspect, interlocking unit 210 its outfan output zero cross signal to output unit 220 so that output unit 220 according to receive electricity
The quiet control signal that road receives carries out quiet control to power amplification system.On the other hand, interlocking unit 210 will by its outfan
Zero cross signal feeds back to its input, so that interlocking unit 210 is after receiving zero cross signal, keeps output zero cross signal, enters
And make output unit 220, according to the quiet control signal receiving circuit reception, power amplification system be carried out the most quiet control.
In one embodiment, above-mentioned interlocking unit 210 include the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5,
6th resistance R6, the 3rd switching tube Q3, the 4th switching tube Q4 and the first quiet control signal input IN；3rd audion Q3's
The first end interconnection of base stage, second end of the 3rd resistance R3 and the 4th resistance R4, first end of the 3rd resistance R3 is interlocking unit
The input of 210；The first end interconnection of the colelctor electrode of the 3rd audion Q3, second end of the 5th resistance R5 and the 6th resistance R6,
First end of the 5th resistance R5 and the first quiet control signal input IN connect；Second end of the 6th resistance R6 and the four or three pole
The base stage of pipe Q4 connects, and the colelctor electrode of the 4th audion Q4 and first end of the 3rd resistance R3 connect, and it connects node for interlocking
The outfan of unit 210；Second end of the 4th resistance R4, the emitter stage of the 3rd switching tube Q3 and the emitter stage of the 4th switching tube Q4
Ground connection GND.
When receiving circuit and being not received by quiet control signal, the first quiet control signal input IN is low level.
No matter whether first end of the first resistance R1 receives zero cross signal, the 3rd audion Q3 is output as low level, the 4th audion
Q4 ends, and the output voltage of interlocking unit 210 follows input voltage change.
When receiving circuit and receiving quiet control signal, the first quiet control signal input IN is high level.If the
First end of one resistance R1 is not received by zero cross signal, then first end of the first resistance R1 is high level, the 3rd audion Q3
Conducting, the collector voltage of the 3rd audion Q3 is pulled low, and the base voltage of the 4th audion Q4 is pulled low, the 4th audion Q4
Cut-off, interlocking unit 210 exports high level, and quiet control signal comes into force.If first end of the first resistance R1 was not received by
Zero-signal, then first end of the first resistance R1 is low level, the 3rd audion Q3 cut-off, the collector voltage of the 3rd audion Q3
Being driven high, the base voltage of the 4th audion Q4 is driven high, the 4th audion Q4 conducting, interlocking unit 210 output low level.
It is noted that the speed of the colelctor electrode output low level in order to make the 4th audion Q4 is accelerated, the high electricity of output
Flat speed slows down, and resists the interlocking critical jamming problem in circuit.In a preferred embodiment, above-mentioned interlocking unit 210 is also
Including the second electric capacity C2, second end of first end of the second electric capacity C2, the colelctor electrode of the 4th audion Q4 and the 3rd resistance R3 is mutual
Even, it connects the outfan that node is interlocking unit 210, the second end ground connection GND of the second electric capacity C2.
In one embodiment, above-mentioned output unit 220 includes the 7th resistance R7, the 8th resistance R8, the 5th audion
Q5 and the second quiet control signal input (in one embodiment, be connected with above-mentioned first quiet control signal input), the
The base stage of five audion Q5 is connected with second end of the 7th resistance R7, and first end of the 7th resistance R7 is the defeated of output unit 220
Enter end；The colelctor electrode of the 5th audion Q5 and second end of the 8th resistance R8 connect, and it connects node is the defeated of output unit 220
Go out end, first end of the 8th resistance R8 and the second quiet control signal input to connect, the grounded emitter of the 5th audion Q5
GND。
When receiving circuit and being not received by quiet control signal, the second quiet control signal input is low level, no
Whether opinion the 5th audion Q5 turns on, output unit output low level signal.When receiving circuit and receiving quiet control signal,
Second quiet control signal input is high level, if the input receiving circuit is high level, then and the 5th audion Q5 conducting,
Receive circuit output low level；If the input receiving circuit is low level, then the 5th audion Q5 cut-off, output unit exports
Quiet control signal.
Hereinafter, in conjunction with Fig. 1 to Fig. 3, the operation principle of the mute control device of power amplification system of the present invention is described:
When receiving circuit and being not received by quiet control signal, the first quiet control signal input IN and second quiet
Control signal input is all low level, no matter the 5th audion Q5 on or off, muting control circuit 200 all exports low
Level, power amplification system keeps output.
When receiving circuit and receiving quiet control signal, the first quiet control signal input IN and the second quiet control
Signal input part is all high level.
If the cut-in voltage that the difference of the voltage of the voltage of loudspeaker positive pole P1 and negative pole P2 is more than the first audion Q1, then the
One audion Q1 conducting, the second audion Q2 cut-off, the base voltage of the 3rd audion Q3 is driven high, and the 3rd audion Q3 leads
Logical, the collector voltage of the 3rd audion Q3 is pulled low, and the base voltage of the 4th audion Q4 is pulled low, and the 4th audion Q4 cuts
Only, the collector voltage of the 4th audion Q4 is driven high, and the base voltage of the 5th audion Q5 is driven high, and the 5th audion Q5 leads
Logical, muting control circuit 200 output low level, power amplification system keeps output.
If the cut-in voltage that the difference of the voltage of the voltage of loudspeaker negative pole P2 and positive pole P1 is more than the second audion Q2, then the
Two audion Q2 conductings, the first audion Q1 cut-off, the base voltage of the 3rd audion Q3 is driven high, and the 3rd audion Q3 leads
Logical, the collector voltage of the 3rd audion Q3 is pulled low, and the base voltage of the 4th audion Q4 is pulled low, and the 4th audion Q4 cuts
Only, the collector voltage of the 4th audion Q4 is driven high, and the base voltage of the 5th audion Q5 is driven high, and the 5th audion Q5 leads
Logical, muting control circuit output low level, power amplification system keeps output.
If the cut-in voltage that the difference of the voltage of the voltage of loudspeaker positive pole P1 and negative pole P2 is less than the first audion Q1, and loudspeaker
The difference of the voltage of negative pole P2 and the voltage of the positive pole P1 cut-in voltage less than the second audion Q2, then the first audion Q1 cuts
Only, the second audion Q2 cut-off, the base voltage of the 3rd audion Q3 is pulled low, the 3rd audion Q3 cut-off, the 3rd audion
The collector voltage of Q3 is driven high, and the base voltage of the 4th audion Q4 is driven high, the 4th audion Q4 conducting, the 5th audion
The collector voltage of Q5 is pulled low, and the 5th audion Q5 cut-off, muting control circuit 200 exports high level, quiet control signal
Come into force.
Accordingly, the present invention also proposes the mute control method of a kind of power amplification system, and this power amplification system includes for receiving
The reception circuit of quiet control signal.
With reference to Fig. 4, in one embodiment, the mute control method of this power amplification system comprises the following steps:
S100: when receiving quiet control signal, carries out zero passage inspection to the audio signal of power amplification system output to loudspeaker
Survey, and export zero cross signal detecting when power amplification system exports the audio signal zero crossing to loudspeaker；
With reference to Fig. 2, in Fig. 2, L1 is the waveform of the audio signal of loudspeaker positive pole P1 input, and L2 is loudspeaker negative pole P2 input
The waveform of audio signal, L3 is the waveform of the audio signal of power amplification system output.
In 0～t1 time period, the voltage of the voltage ratio negative pole P2 of loudspeaker positive pole P1 is high, to the t1 moment, loudspeaker positive pole P1's
Voltage is equal with the voltage of negative pole P2.Moment before time tl, or moment after instant tl, connect if receiving circuit
Receive quiet control signal, then export zero cross signal；Otherwise, do not export zero cross signal.
In t1～the t2 time period, the voltage of the voltage ratio positive pole P1 of loudspeaker negative pole P2 is high, to the t2 moment, loudspeaker negative pole P2's
Voltage is equal with the voltage of positive pole P1.Moment before the t2 moment, or moment after instant t 2, connect if receiving circuit
Receive quiet control signal, then export zero cross signal；Otherwise, do not export zero cross signal.
It should be noted that the cycle that the power amplification system shown in Fig. 2 exports the oscillogram to loudspeaker is t2, hereafter, to appointing
Anticipate a tx moment, if loudspeaker positive pole P1 voltage is equal with negative pole P2 voltage, then before tx in a flash or after in a flash, if
Receive circuit and receive quiet control signal, then export zero cross signal；Otherwise, do not export zero cross signal.
S200: when receiving zero cross signal, power amplification system is carried out quiet by the quiet control signal according to receiving circuit reception
Sound control system.
Specifically, when receiving zero cross signal, the quiet control signal that control reception circuit receives exports to power amplifier
System, it is achieved the quiet control to power amplification system.
It is understood that when the audio signal zero crossing of power amplification system output to loudspeaker, the voltage of loudspeaker positive pole P1
Almost equal with the voltage of negative pole P2, power amplification system close to zero output state, now, if power amplification system being carried out quiet dynamic
Make, then loudspeaker will not send explosion sound.Therefore, technical solution of the present invention can eliminate and power amplification system carries out quiet action time institute
The explosion sound produced.
Power amplification system, by using when receiving circuit and receiving quiet control signal, is exported extremely by technical solution of the present invention
The audio signal of loudspeaker carries out zero passage detection, and exports when power amplification system exports the audio signal zero crossing to loudspeaker detecting
Zero cross signal, to carry out quiet control according to the quiet control signal receiving circuit reception to power amplification system.Due in power amplifier system
When system exports the audio signal zero crossing to loudspeaker, the voltage of loudspeaker positive pole P1 and the voltage of negative pole P2 are almost equal, power amplifier system
System is close to zero output state, and therefore, when using technical solution of the present invention that power amplification system is carried out quiet action, loudspeaker will not send
Explosion sound.
The foregoing is only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every at this
Under the inventive concept of invention, utilize the equivalent structure transformation that description of the invention and accompanying drawing content are made, or directly/indirectly use
The technical field relevant at other is included in the scope of patent protection of the present invention.
Claims (10)
1. a mute control device for power amplification system, described power amplification system includes the reception electricity for receiving quiet control signal
Road, it is characterised in that this device includes:
Zero cross detection circuit, for when described reception circuit receives quiet control signal, exports to loudspeaker power amplification system
Audio signal carry out zero passage detection, and the output when the output of described power amplification system being detected to the audio signal zero crossing of loudspeaker
Zero cross signal；
Muting control circuit, for when receiving described zero cross signal, according to the described quiet control of described reception circuit reception
Signal processed carries out quiet control to described power amplification system.
2. the mute control device of power amplification system as claimed in claim 1, it is characterised in that described zero cross detection circuit includes
Comparing unit, the in-phase input end of described comparing unit is connected with the positive pole of described loudspeaker, the anti-phase input of described comparing unit
End is connected with the negative pole of described loudspeaker, and the outfan of described comparing unit is used for exporting described zero cross signal.
3. the mute control device of power amplification system as claimed in claim 2, it is characterised in that described comparing unit includes first
Audion and the second audion, the emitter stage of described first audion is connected with the base stage of described second audion, its connecting joint
Point is the in-phase input end of described comparing unit；The base stage of described first audion connects with the emitter stage of described second audion
Connecing, it connects the inverting input that node is described comparing unit；The colelctor electrode of described first audion and described two or three pole
The colelctor electrode of pipe connects, and it connects the outfan that node is described comparing unit.
4. the mute control device of power amplification system as claimed in claim 2, it is characterised in that described zero cross detection circuit also wraps
Including filter unit, the first input end of described filter unit is connected with the positive pole of described loudspeaker, and the second of described filter unit is defeated
Enter end to be connected with the negative pole of described loudspeaker；First outfan of described filter unit connects with the in-phase input end of described comparing unit
Connecing, the second outfan of described filter unit is connected with the inverting input of described comparing unit.
5. the mute control device of power amplification system as claimed in claim 4, it is characterised in that described filter unit includes first
Resistance, the second resistance and the first electric capacity, the first input end that the first end is described filter unit of described first resistance, described
Second end of one resistance is connected with the first end of described first electric capacity, and it connects the first output that node is described filter unit
End；Second input that first end is described filter unit of described second resistance, the second end of described second resistance is with described
Second end of the first electric capacity connects, and it connects the second outfan that node is described filter unit.
6. the mute control device of the power amplification system as described in claim 1-5 any one, it is characterised in that described quiet control
Circuit processed includes interlocking unit and output unit, the input of described interlocking unit, the outfan of described interlocking unit and described
The input interconnection of output unit, the outfan of described output unit is used for output mute control signal.
7. the mute control device of power amplification system as claimed in claim 6, it is characterised in that described interlocking unit includes the 3rd
Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 3rd switching tube, the 4th switching tube and the input of the first quiet control signal
End；First end interconnection of the base stage of described 3rd audion, the second end of described 3rd resistance and described 4th resistance, described the
The input that first end is described interlocking unit of three resistance；The colelctor electrode of described 3rd audion, the of described 5th resistance
Two ends and the first end interconnection of described 6th resistance, the first end of described 5th resistance and described first quiet control signal input
End connects；Second end of described 6th resistance is connected with the base stage of described 4th audion, the colelctor electrode of described 4th audion
Being connected with the first end of described 3rd resistance, it connects the outfan that node is described interlocking unit；The of described 4th resistance
Two ends, the emitter stage of described 3rd switching tube and the grounded emitter of described 4th switching tube.
8. the mute control device of power amplification system as claimed in claim 7, it is characterised in that described interlocking unit also includes the
Two electric capacity, the second end interconnection of the first end of described second electric capacity, the colelctor electrode of described 4th audion and described 3rd resistance,
It connects the outfan that node is described interlocking unit, the second end ground connection of described second electric capacity.
9. the mute control device of power amplification system as claimed in claim 6, it is characterised in that described output unit includes the 7th
Resistance, the 8th resistance, the 5th audion and the second quiet control signal input, the base stage of described 5th audion and described the
Second end of seven resistance connects, the input that the first end is described output unit of described 7th resistance；Described 5th audion
Colelctor electrode be connected with the second end of described 8th resistance, it connects node is the outfan of described output unit, the described 8th
First end of resistance is connected with described second quiet control signal input, the grounded emitter of described 5th audion.
10. a mute control method for power amplification system, described power amplification system includes the reception for receiving quiet control signal
Circuit, it is characterised in that the method comprises the following steps:
When receiving quiet control signal, the audio signal of power amplification system output to loudspeaker is carried out zero passage detection, and in inspection
Measure output zero cross signal when described power amplification system exports the audio signal zero crossing to loudspeaker；
Receive described zero cross signal time, according to described reception circuit receive described quiet control signal to described power amplification system
Carry out quiet control.
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|---|---|---|---|
| CN201610900383.7A CN106303834B (en) | 2016-10-14 | 2016-10-14 | Mute control device and method of power amplification system |
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| CN201610900383.7A CN106303834B (en) | 2016-10-14 | 2016-10-14 | Mute control device and method of power amplification system |
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| CN106303834B CN106303834B (en) | 2021-03-12 |
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|---|---|
| CN106303834B (en) | 2021-03-12 |
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Address after: 516006 community 37, Zhongkai high tech Zone, Huizhou, Guangdong Patentee after: Tongli Technology Co.,Ltd. Address before: 516006 Zhongkai high tech Zone 37, Huizhou, Guangdong Patentee before: TONLY ELECTRONICS HOLDINGS Ltd. |