CN206807738U - The audio frequency phase switching circuit and sound equipment of power amplifier - Google Patents
The audio frequency phase switching circuit and sound equipment of power amplifier Download PDFInfo
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- CN206807738U CN206807738U CN201720506603.8U CN201720506603U CN206807738U CN 206807738 U CN206807738 U CN 206807738U CN 201720506603 U CN201720506603 U CN 201720506603U CN 206807738 U CN206807738 U CN 206807738U
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Abstract
The utility model discloses the audio frequency phase switching circuit and sound equipment of a kind of power amplifier, the audio frequency phase switching circuit of the power amplifier includes audio signal input end, switching on-off circuit unit, discharge circuit unit and audio differential signal outputs；Switching on-off circuit unit exports the audio signal of input to the first input end of discharge circuit unit or the second input；The audio signal of first input end is carried out anti-phase amplification by discharge circuit unit, and the audio signal after anti-phase amplification is converted into the first difference audio signal, and carry out the audio signal of the second input with mutually amplification, and the second difference audio signal will be converted to the audio signal after mutually amplifying；Audio signal input end is connected through switching on-off circuit unit with the first input end of discharge circuit unit and the second input, and the output end of discharge circuit unit is connected through audio differential signal outputs with power amplifier.The utility model has the advantages of cost is low.
Description
Technical field
It the utility model is related to field of audio, the audio frequency phase switching circuit and sound equipment of more particularly to a kind of power amplifier.
Background technology
The left and right acoustic channels loudspeaker of sound system and the putting position of bass box by application scenarios due to being limited, it usually needs
More preferable hearing effect is obtained by adjusting the audio frequency phase (Phase) of bass box, in the prior art, typically using numeral
Digital audio processing IC realizes the adjustment function of audio frequency phase.In order to realize that audio is positive and negative in bass analog amplifier system
The switching (audio frequency phase is switched to 180 ° by 0 °) of phase, audio frequency phase can be increased in the input front end of bass analog amplifier
Switching circuit, the conversion for making audio signal phase before power amplifier is entered occur 180 °, so as to realize the handoff functionality of audio frequency phase.
However, the above-mentioned scheme that audio frequency phase switching is realized using digital audio processing integrated circuit of the prior art, is present into
The defects of this is higher.
Utility model content
Main purpose of the present utility model is to propose a kind of audio frequency phase switching circuit of power amplifier, it is intended to reduces cost.
To achieve these goals, the utility model provides a kind of audio frequency phase switching circuit of power amplifier, the power amplifier
Audio frequency phase switching circuit includes audio signal input end, switching on-off circuit unit, discharge circuit unit and audio difference letter
Number output end；Wherein：
The switching on-off circuit unit, the audio signal for the audio signal input end to be inputted switch output
To the first input end or the second input of the discharge circuit unit；
The discharge circuit unit, the audio signal for the first input end to be inputted are carried out at anti-phase and amplification
Reason, and the audio signal after anti-phase and enhanced processing is converted into the first difference audio signal；And by second input
The audio signal of input carries out being converted to the second difference audio with phase enhanced processing, and by the audio signal after same phase enhanced processing
Signal；
The audio differential signal outputs, for the first difference audio signal or the second difference audio to be believed
Number output to the power amplifier audio differential signal input；
The audio signal input end through the switching on-off circuit unit respectively with the discharge circuit unit first
Input and the connection of the second input, the output end of the discharge circuit unit through the audio differential signal outputs with it is described
The audio differential signal input connection of power amplifier.
Preferably, the discharge circuit unit includes amplifying circuit subelement and inverter circuit subelement；Wherein：
The amplifying circuit subelement, the audio signal for the first input end input to the discharge circuit unit are entered
The anti-phase and enhanced processing of row, export the positive signal of the first difference audio signal；And to the discharge circuit unit
The audio signal of two inputs input exported with phase enhanced processing the positive signal of the second difference audio signal；
The inverter circuit subelement, for carrying out anti-phase processing to the positive signal of the first difference audio signal,
Export the negative signal of the first difference audio signal；And anti-phase place is carried out to the positive signal of the second difference audio signal
Reason, export the negative signal of the second difference audio signal；
The input of the amplifying circuit subelement is connected with the switching on-off circuit unit, and amplifying circuit is single
The output end input with the forward end and the inverter circuit subelement of the audio differential signal outputs respectively of member
End connection, the output end of the inverter circuit subelement are connected with the backward end of the audio differential signal outputs.
Preferably, the amplifying circuit subelement includes operating voltage input, first resistor, second resistance, the 3rd electricity
Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the first computing are put
Big device；Wherein：
The first end of first electric capacity be the discharge circuit unit first input end, the first of first electric capacity
End is connected with the on-off circuit unit that switches, and the second end of first electric capacity is through the first resistor respectively with described second
The inverting input connection of the first end of resistance, the first end of the second electric capacity and first operational amplifier；Second electricity
The output end of second end of resistance and the second end of the second electric capacity with first operational amplifier is connected；First computing is put
Forward end of the output end of big device also with the audio differential signal outputs is connected；
The first end of 3rd electric capacity be the discharge circuit unit the second input, the first of the 3rd electric capacity
End is connected with the on-off circuit unit that switches, and the second end of the 3rd electric capacity is through the 4th resistance respectively with the described 5th
The in-phase input end of the first end of resistance and first operational amplifier connects；Second end of the 5th resistance is through described
Seven resistance are connected with the inverter circuit subelement；The first end of the 3rd resistor and the first end of first electric capacity connect
Connect, the second end ground connection of the 3rd resistor；The first end of 6th resistance is connected with the first end of the 3rd electric capacity, institute
State the second end ground connection of the 6th resistance；The power positive end of first operational amplifier is connected with the operating voltage input,
The power supply negative terminal ground connection of first operational amplifier.
Preferably, the inverter circuit subelement include the 8th resistance, the 9th resistance, the tenth resistance, the 11st resistance,
4th electric capacity, the 5th electric capacity, the second operational amplifier, the 5th resistance and the 7th resistance；Wherein：
The inverting input of second operational amplifier is defeated through the tenth resistance and first operational amplifier
Go out end connection, the inverting input of second operational amplifier is also through the 11st resistance and second operational amplifier
Output end connection, the 5th electric capacity and the 11st resistor coupled in parallel, the in-phase input end of second operational amplifier
The second end of the first end with the 8th resistance, the first end of the 9th resistance and the 7th resistance is connected respectively；Described
The second end ground connection of nine resistance, the 4th electric capacity and the 9th resistor coupled in parallel；Second end of the 8th resistance with it is described
Operating voltage input connects；The output end of second operational amplifier is also reverse with the audio differential signal outputs
End connection；In-phase input end of the first end of 7th resistance through the 5th resistance and first operational amplifier connects
Connect.
Preferably, the inverter circuit subelement also includes being used to filter the voltage of the operating voltage input
The filter circuit of ripple, the filter circuit include the 6th electric capacity and the 7th electric capacity；Wherein：
The first end of 6th electric capacity and the first end of the 7th electric capacity are connected with the operating voltage input,
Second end of the 6th electric capacity and the second end of the 7th electric capacity are grounded.
Preferably, the resistance of the tenth resistance and the resistance of the 11st resistance are equal.
Preferably, the switching on-off circuit unit includes alternative gating switch, and the alternative gating switch is two
Three pin toggle switches of shelves, the first pin position of the toggle switch are connected with the audio signal input end, the toggle switch
Crus secunda position is connected with the second input of the discharge circuit unit, the 3rd pin position and the amplifier electricity of the toggle switch
The first input end connection of road unit.
In addition, to achieve the above object, the utility model also provides a kind of sound equipment, the sound equipment includes work(as described above
The audio frequency phase switching circuit put.
The utility model provides a kind of audio frequency phase switching circuit of power amplifier, the audio frequency phase switching circuit bag of the power amplifier
Include audio signal input end, switching on-off circuit unit, discharge circuit unit and audio differential signal outputs；The switching is opened
Circuit unit is closed, the audio signal switching for the audio signal input end to be inputted is exported to the discharge circuit unit
First input end or the second input；The discharge circuit unit, for the audio signal for inputting the first input end
Anti-phase and enhanced processing is carried out, and the audio signal after anti-phase and enhanced processing is converted into the first difference audio signal；And
The audio signal of second input input is carried out with phase enhanced processing, and the audio signal after same phase enhanced processing is turned
It is changed to the second difference audio signal；The audio differential signal outputs, for by the first difference audio signal or described
Second difference audio signal is exported to the audio differential signal input of the power amplifier；Cut described in the audio signal input end warp
Change on-off circuit unit to be connected with the first input end of the discharge circuit unit and the second input respectively, the discharge circuit
The output end of unit is connected through the audio differential signal outputs with the audio differential signal input of the power amplifier.This practicality
The audio frequency phase switching circuit of novel power amplifier has the advantages of cost is low；Meanwhile the utility model is also with simple in construction and easy
The advantages of realizing.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram of the embodiment of audio frequency phase switching circuit one of the utility model power amplifier；
Fig. 2 is the electrical block diagram of the embodiment of audio frequency phase switching circuit one of the utility model power amplifier；
Fig. 3 is that alternative gating switch is in described in the embodiment of audio frequency phase switching circuit one of the utility model power amplifier
Corresponding audio signal waveform diagram during state 1；
Fig. 4 is that alternative gating switch is in described in the embodiment of audio frequency phase switching circuit one of the utility model power amplifier
Corresponding audio signal waveform diagram during state 2.
Realization, functional characteristics and the advantage of the utility model purpose will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that specific embodiment described herein is not used to limit this only to explain the utility model
Utility model.
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only part of the embodiment of the present utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belong to the scope of the utility model protection.
It is to be appreciated that the description for being related to " first ", " second " etc. in the utility model is only used for describing purpose, and can not
It is interpreted as indicating or implies its relative importance or imply the quantity of the technical characteristic indicated by indicating.Thus, define " the
One ", at least one this feature can be expressed or be implicitly included to the feature of " second ".In addition, the skill between each embodiment
Art scheme can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when technical scheme
With reference to occurring conflicting or will be understood that the combination of this technical scheme is not present when can not realize, also not in the utility model
It is required that protection domain within.
The utility model provides a kind of audio frequency phase switching circuit of power amplifier, and reference picture 1, Fig. 1 is the utility model power amplifier
The embodiment of audio frequency phase switching circuit one high-level schematic functional block diagram, in the present embodiment, the audio frequency phase switching electricity of the power amplifier
Road 10 includes audio signal input end 11, switching on-off circuit unit 12, discharge circuit unit 13 and the output of audio differential signal
End 14.
Wherein, in the present embodiment, the switching on-off circuit unit 12, for the institute of audio signal input end 11 is defeated
The audio signal switching entered is exported to the first input end a or the second input b of the discharge circuit unit 13；
The discharge circuit unit 13, the audio signal for the first input end a to be inputted carry out anti-phase and amplification
Processing (i.e. the conversion of 180 ° of phase discovery), and the audio signal after anti-phase and enhanced processing is converted into the first difference audio letter
Number；And carry out the audio signal of the second input b inputs with phase enhanced processing, and by the sound after same phase enhanced processing
Frequency signal is converted to the second difference audio signal；
The audio differential signal outputs 14, for the first difference sound for exporting the discharge circuit unit 13
Frequency signal or the second difference audio signal of the discharge circuit unit 13 output are exported to the audio difference letter of power amplifier 20
Number input (the non-label of figure)；
In the present embodiment, the audio signal input end 11 through the switching on-off circuit unit 12 respectively with the amplifier
The first input end a of circuit unit 13 and the second input b connections, the output end of the discharge circuit unit 13 is through the audio
Differential signal outputs 14 are connected with the audio differential signal input of the power amplifier 20.
Further, in the present embodiment, the discharge circuit unit 13 includes amplifying circuit subelement 131 and phase inverter electricity
Way unit 132.
Specifically, in the present embodiment, the amplifying circuit subelement 131, for the discharge circuit unit 13
The audio signal of one input a inputs carries out anti-phase and enhanced processing, exports the positive signal of the first difference audio signal；With
And the audio signal that the second input b of the discharge circuit unit 13 is inputted is carried out with phase enhanced processing, output described the
The positive signal of two difference audio signals；
The inverter circuit subelement 132, for first difference exported to the amplifying circuit subelement 131
The positive signal of audio signal carries out anti-phase processing, exports the negative signal of the first difference audio signal；And to the amplification
The positive signal for the second difference audio signal that circuit subelement 131 exports carries out anti-phase processing, exports second difference
The negative signal of audio signal；
In the present embodiment, the input of the amplifying circuit subelement 131 includes first input end and the second input, institute
The first input end for stating amplifying circuit subelement 131 is the first input end a of the discharge circuit unit 13, and the amplification is electric
Second input of way unit 131 is the second input b of the discharge circuit unit 13, the amplifying circuit subelement
131 first input end and the second input are connected with the switching on-off circuit unit 12, the amplifying circuit subelement
131 output end the forward end P with the audio differential signal outputs 14 and the inverter circuit subelement 132 respectively
Input connection, the output end of the inverter circuit subelement 132 is reverse with the audio differential signal outputs 14
Hold N connections.
Fig. 2 is the electrical block diagram of the embodiment of audio frequency phase switching circuit one of the utility model power amplifier, is joined in the lump
According to Fig. 1 and Fig. 2, in the present embodiment, the amplifying circuit subelement 131 include operating voltage input VCC, first resistor R1,
Second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first electric capacity C1,
Second electric capacity C2, the 3rd electric capacity C3 and the first operational amplifier U1A.
Specifically, the first end of the first electric capacity C1 for the discharge circuit unit 13 first input end a, described the
One electric capacity C1 first end is connected with the switching on-off circuit unit 12, and the second end of the first electric capacity C1 is through described first
Resistance the R1 first end with the second resistance R2, the second electric capacity C2 first end and the first operational amplifier U1A respectively
Inverting input connection；The second end of the second resistance R2 and the second electric capacity C2 the second end are put with first computing
Big device U1A output end connection；The output end of the first operational amplifier U1A also with the audio differential signal outputs 14
Forward end P connections；In the present embodiment, the sound of the forward end P of the audio differential signal outputs 14 also with the power amplifier 20
The forward end connection (not shown) of frequency differential signal input.
The first end of the 3rd electric capacity C3 be the discharge circuit unit 13 the second input b, the 3rd electric capacity
C3 first end is connected with the switching on-off circuit unit 12, and the second end of the 3rd electric capacity C3 is through the 4th resistance
R4 is connected with the first end of the 5th resistance R5 and the in-phase input end of the first operational amplifier U1A respectively；Described
Five resistance R5 the second end is connected through the 7th resistance R7 with the inverter circuit subelement 132；The 3rd resistor R3
First end be connected with the first end of the first electric capacity C1, the second end of 3rd resistor R3 ground connection；6th resistance
R6 first end is connected with the first end of the 3rd electric capacity C3, the second end ground connection of the 6th resistance R6；First fortune
The power positive end for calculating amplifier U1A is connected with the operating voltage input VCC, the power supply of the first operational amplifier U1A
Negativing ending grounding.
In the present embodiment, the inverter circuit subelement 132 includes the 8th resistance R8, the 9th resistance R9, the tenth resistance
R10, the 11st resistance R11, the 4th electric capacity C4, the 5th electric capacity C5, the second operational amplifier U1B, the 5th resistance R5 and institute
The 7th resistance R7 is stated, i.e., in the present embodiment, the 5th resistance R5 and the 7th resistance R7 are the amplifying circuit subelement
131 and the common element of the inverter circuit subelement 132.
Specifically, in the present embodiment, the inverting input of the second operational amplifier U1B is through the tenth resistance R10
It is connected with the output end of the first operational amplifier U1A in the amplifying circuit subelement 131, second operation amplifier
Device U1B inverting input is also connected through the 11st resistance R11 with the output end of the second operational amplifier U1B, institute
State that the 5th electric capacity C5 is in parallel with the 11st resistance R11, the in-phase input end of the second operational amplifier U1B respectively with institute
State the second end connection of the 8th resistance R8 first end, the 9th resistance R9 first end and the 7th resistance R7；Described 9th
Resistance R9 the second end ground connection, the 4th electric capacity C4 are in parallel with the 9th resistance R9；The second end of the 8th resistance R8
It is connected with the operating voltage input VCC；The output end of the second operational amplifier U1B also with the audio differential signal
The backward end N connections of output end 14；The first end of the 7th resistance R7 is through the 5th resistance R5 and amplifying circuit
The in-phase input end connection of the first operational amplifier U1A in unit 131.In the present embodiment, the audio differential signal
Backward ends of the backward end N of output end 14 also with the audio differential signal input of the power amplifier 20 is connected (not shown).
Further, in the present embodiment, the inverter circuit subelement 132 is also included for defeated to the operating voltage
Enter to hold the filter circuit 1321 that VCC voltage is filtered, the filter circuit 1321 includes the 6th electric capacity C6 and the 7th electric capacity
C7.Specifically, the first end of the 6th electric capacity C6 and the first end of the 7th electric capacity C7 input with the operating voltage
VCC connections are held, the second end of the 6th electric capacity C6 and the second end of the 7th electric capacity C7 are grounded.
In the present embodiment, the 8th resistance R8 and the 9th resistance R9 form bleeder circuit 1322, the work electricity
Pressure input VCC voltage is the homophase input of the second operational amplifier U1B after the partial pressure of the bleeder circuit 1322
End provides a reference voltage.
In the present embodiment, the 5th resistance R5, the 7th resistance R7 and the 4th electric capacity C4 form a low pass
Filter circuit (the non-label of figure), the signal noise for the 3rd electric capacity C3 institutes input audio signal of being hung oneself for decaying.
In the present embodiment, the second operational amplifier U1B is accomplished that the function of phase inverter, therefore, second fortune
Constant calculation amplifier U1B gain coefficient is -1, i.e., the tenth resistance R10 resistance and the described 11st described in the present embodiment
Resistance R11 resistance is equal.
In the present embodiment, the switching on-off circuit unit 12 includes alternative gating switch SW1, specifically, this implementation
The alternative gating switch SW1 in example is two grade of three pin toggle switch, the first pin position of the alternative gating switch SW1
It is connected (marked as the pin position of " 1 " in the corresponding alternative gating switch SW1) with the audio signal input end 11, described two
Select the crus secunda position (marked as the pin position of " 2 " in the corresponding alternative gating switch SW1) of a gating switch SW1 and the fortune
Put the second input b connections of circuit unit 13, i.e., described in the present embodiment alternative gating switch SW1 crus secunda position with
The first end connection of the 3rd electric capacity C3；The 3rd pin position (the corresponding alternative gating of the alternative gating switch SW1
Marked as the pin position of " 3 " in switch SW1) be connected with the first input end a of the discharge circuit unit, i.e., described in the present embodiment
Alternative gating switch SW1 the 3rd pin position is connected with the first end of the first electric capacity C1.
In the present embodiment, when the first pin position (corresponding alternative gating switch of the alternative gating switch SW1
Marked as the pin position of " 1 " in SW1) (the corresponding alternative gating is opened with the crus secunda position of the alternative gating switch SW1
Close in SW1 marked as the pin position of " 2 ") when connecting, the audio signal that the audio signal input end 11 inputs is through the described 3rd electricity
Hold C3 to input to the discharge circuit unit 13, i.e. now second input of the audio signal from the discharge circuit unit 13
End b is inputted into the amplifying circuit subelement 131；When the first pin position (corresponding described two of the alternative gating switch SW1
Select in a gating switch SW1 marked as the pin position of " 1 ") the 3rd pin position (corresponding described two with the alternative gating switch SW1
Select in a gating switch SW1 marked as the pin position of " 3 ") when connecting, audio signal warp that the audio signal input end 11 inputs
The first electric capacity C1 is inputted to the discharge circuit unit 13, i.e., now the audio signal from the discharge circuit unit 13
First input end a input into the amplifying circuit subelement 131.
In the present embodiment, the first operational amplifier U1A and the second operational amplifier U1B are dual operational amplifier chips
In two operational amplifiers, specifically, the present embodiment uses the model of dual operational amplifier chip to enter as needed
Row setting, it is preferable that the model NJM4565M of the dual operational amplifier chip.The dual operational amplifier chip uses
Dc source 12V powers, i.e., in the present embodiment, the voltage of the operating voltage input VCC is 12V.
In the present embodiment, the 6th electric capacity C6 and the 7th electric capacity C7 are power filtering capacitors, i.e., described 6th electricity
Hold C6 and the 7th electric capacity C7 to be filtered the operating voltage input VCC 12V voltages inputted.In the present embodiment,
The 8th resistance R8 and the 9th resistance R9 forms the bleeder circuit 1322, and resistance of the 8th resistance R8 etc.
In the resistance of the 9th resistance.Therefore, in the present embodiment, the voltage of the operating voltage input VCC is through the described 8th electricity
After the partial pressure for hindering R8 and the 9th resistance R9, the second operational amplifier U1B is produced in the processing letter of audio containing positive-negative half-cycle
6V reference voltages needed for number.In the present embodiment, the 4th electric capacity C4, the 5th resistance R5 and the 7th resistance R7 institutes group
Into the low-pass filter circuit, for decay through the 3rd electric capacity C3 input audio signal signal noise so that
The in-phase input end of the second operational amplifier U1B is able to maintain that 6V reference voltage.
In the present embodiment, when the first pin position (corresponding alternative gating switch of the alternative gating switch SW1
Marked as the pin position of " 1 " in SW1) (the corresponding alternative gating is opened with the crus secunda position of the alternative gating switch SW1
Close SW1 in marked as " 2 " pin position) connect when, if the on off state for now defining the alternative gating switch SW1 is state
1, and the phase for defining the now power amplifier 20 is 0 °, the audio signal that the audio signal input end 11 inputs is by described the
Three electric capacity C3 enter in the amplifying circuit subelement 131 in the discharge circuit circuit unit 13, now in the present embodiment
The first operational amplifier U1A be configured to in-phase proportion amplifier, gain coefficient is by the first resistor R1, described
Two resistance R2, the 4th resistance R4, the 5th resistance R5 and the 7th resistance R7 are controlled and adjusted.That is this reality
Apply in example, when the first pin position of the alternative gating switch SW1 and the crus secunda position of the alternative gating switch SW1 are connected
When, the gain coefficient of the first operational amplifier U1AMeanwhile through the described first fortune
Calculate amplifier U1A and feed back to inverter circuit via the tenth resistance R10 with the output signal after phase enhanced processing
Second operational amplifier U1B reverse input end described in unit 132.In the present embodiment, the second operational amplifier U1B
It is configured to 1:1 anti-phase proportional amplifier, the constant gain coefficient of the second operational amplifier U1B is -1, i.e., described second
The amplitude of the audio signal and the first operational amplifier U1A exports audio signals of operational amplifier U1B outputs is consistent,
And signal phase differs 180 °.In the present embodiment, when the first pin position (corresponding two choosing of the alternative gating switch SW1
Marked as the pin position of " 1 " in one gating switch SW1) crus secunda position (corresponding described two with the alternative gating switch SW1
Select in a gating switch SW1 marked as the pin position of " 2 ") when connecting, i.e., when the alternative gating switch SW1 is in described
During state 1, the forward end P of the audio signal waveform of the audio signal input end 11 and the audio differential signal outputs 14
And backward end N audio signal waveform is as shown in Figure 3.Reference picture 3, the signal ANALOG_IN_1 in Fig. 3 is the alternative
Gating switch SW1 is the audio signal waveform of the audio signal input end 11 when being in the state 1, signal ANALOG_P1
It is when being in the state 1 for the alternative gating switch SW1, the forward end P's of the audio differential signal outputs 14
Audio signal waveform, signal ANALOG_N1 are that the alternative gating switch SW1 is audio when being in the state 1
The backward end N of differential signal outputs 14 audio signal waveform.
In the present embodiment, when the first pin position (corresponding alternative gating switch of the alternative gating switch SW1
Marked as the pin position of " 1 " in SW1) (the corresponding alternative gating is opened with the 3rd pin position of the alternative gating switch SW1
Close SW1 in marked as " 3 " pin position) connect when, if the on off state for now defining the alternative gating switch SW1 is state
2, and the phase for defining the now power amplifier 20 is 180 °, described in the audio signal process that the audio signal input end 11 inputs
First electric capacity C1 enters in the amplifying circuit subelement 131 in the discharge circuit circuit unit 13, now the present embodiment
In the first operational amplifier U1A be configured to anti-phase proportional amplifier, gain coefficient is by the first resistor R1 and described
Second resistance R2 is controlled and adjusted.I.e. in the present embodiment, when the alternative gating switch SW1 the first pin position with it is described
When alternative gating switch SW1 the 3rd pin position is connected, the gain coefficient A2=-R2/R1 of the first operational amplifier U1A.
Meanwhile the output signal after the anti-phase amplifications of the first operational amplifier U1A fed back to via the tenth resistance R10 it is described
Second operational amplifier U1B reverse input end described in inverter circuit subelement 132.In the present embodiment, second fortune
Calculate amplifier U1B and be configured to 1:1 anti-phase proportional amplifier, the gain coefficient of the second operational amplifier U1B it is constant for-
1, i.e., the audio signal and the first operational amplifier U1A exports audio signals of described second operational amplifier U1B outputs
Amplitude is consistent, and signal phase differs 180 °.In the present embodiment, when the first pin position of the alternative gating switch SW1
The 3rd pin position of (marked as the pin position of " 1 " in the corresponding alternative gating switch SW1) with the alternative gating switch SW1
When being connected (marked as the pin position of " 3 " in the corresponding alternative gating switch SW1), i.e., as the alternative gating switch SW1
It is the audio signal waveform of the audio signal input end 11 and the audio differential signal outputs when being in the state 2
14 forward end P and backward end N audio signal waveform are as shown in Figure 4.Reference picture 4, the signal ANALOG_IN_2 in Fig. 4 are
The alternative gating switch SW1 is the audio signal waveform of the audio signal input end 11 when being in state 2, signal
ANALOG_P2 is that the alternative gating switch SW1 is when being in state 2, and the audio differential signal outputs 14 are just
To end P audio signal waveform, signal ANALOG_N2 is that the alternative gating switch SW1 is sound when being in state 2
The backward end N of frequency differential signal outputs 14 audio signal waveform.
It should be noted that in the present embodiment, no matter the alternative gating switch SW1 is in state 1
State 2, the size of the gain coefficient of the first operational amplifier U1A in the amplifying circuit subelement 131 will keep one
Cause, i.e. A1=A2, namelyIt so just can guarantee that the alternative gating switch SW1
Under state 1 and the two states of state 2, the phase of the only audio signal of change.
The audio frequency phase switching circuit of the present embodiment power amplifier using simple discharge circuit unit due to can be achieved audio
The handoff functionality of positive antiphase, therefore, the present embodiment has the advantages of cost is low；Also, the present embodiment also has simple in construction
And the advantages of easily realizing.
The utility model also provides a kind of sound equipment, and the sound equipment includes the audio frequency phase switching circuit of power amplifier, the sound of the power amplifier
The structure of frequency phase-switching circuit can refer to above-described embodiment, will not be repeated here.Naturally, due to the sound of the present embodiment
The technical scheme for the audio frequency phase switching circuit for employing above-mentioned power amplifier is rung, therefore the sound equipment has the audio frequency phase of above-mentioned power amplifier
All beneficial effects of switching circuit.
Preferred embodiment of the present utility model is these are only, not thereby limits the scope of the claims of the present utility model, it is every
The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical areas, similarly it is included in scope of patent protection of the present utility model.
Claims (8)
1. the audio frequency phase switching circuit of a kind of power amplifier, it is characterised in that the audio frequency phase switching circuit of the power amplifier includes sound
Frequency signal input part, switching on-off circuit unit, discharge circuit unit and audio differential signal outputs；Wherein：
The switching on-off circuit unit, the audio signal switching for the audio signal input end to be inputted are exported to institute
State the first input end or the second input of discharge circuit unit；
The discharge circuit unit, the audio signal for the first input end to be inputted carry out anti-phase and enhanced processing, and
Audio signal after anti-phase and enhanced processing is converted into the first difference audio signal；And input second input
Audio signal carries out being converted to the second difference audio signal with phase enhanced processing, and by the audio signal after same phase enhanced processing；
The audio differential signal outputs, for the first difference audio signal or the second difference audio signal is defeated
Go out to the audio differential signal input of the power amplifier；
The audio signal input end is through the switching on-off circuit unit the first input with the discharge circuit unit respectively
End and the connection of the second input, the output end of the discharge circuit unit is through the audio differential signal outputs and the power amplifier
Audio differential signal input connection.
2. the audio frequency phase switching circuit of power amplifier as claimed in claim 1, it is characterised in that the discharge circuit unit includes
Amplifying circuit subelement and inverter circuit subelement；Wherein：
The amplifying circuit subelement, the audio signal for the first input end input to the discharge circuit unit carry out anti-
Phase and enhanced processing, export the positive signal of the first difference audio signal；It is and defeated to the second of the discharge circuit unit
The audio signal for entering end input exported with phase enhanced processing the positive signal of the second difference audio signal；
The inverter circuit subelement, for carrying out anti-phase processing, output to the positive signal of the first difference audio signal
The negative signal of the first difference audio signal；And anti-phase processing is carried out to the positive signal of the second difference audio signal,
Export the negative signal of the second difference audio signal；
The input of the amplifying circuit subelement is connected with the switching on-off circuit unit, the amplifying circuit subelement
Output end connects with the forward end of the audio differential signal outputs and the input of the inverter circuit subelement respectively
Connect, the output end of the inverter circuit subelement is connected with the backward end of the audio differential signal outputs.
3. the audio frequency phase switching circuit of power amplifier as claimed in claim 2, it is characterised in that the amplifying circuit subelement bag
Include operating voltage input, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th electricity
Resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the first operational amplifier；Wherein：
The first end of first electric capacity be the discharge circuit unit first input end, the first end of first electric capacity with
The switching on-off circuit unit connection, the second end of first electric capacity through the first resistor respectively with the second resistance
First end, the first end of the second electric capacity and first operational amplifier inverting input connection；The second resistance
The output end of second end and the second end of the second electric capacity with first operational amplifier is connected；First operational amplifier
Forward end of the output end also with the audio differential signal outputs be connected；
The first end of 3rd electric capacity be the discharge circuit unit the second input, the first end of the 3rd electric capacity with
The switching on-off circuit unit connection, the second end of the 3rd electric capacity through the 4th resistance respectively with the 5th resistance
First end and first operational amplifier in-phase input end connection；Second end of the 5th resistance is through the described 7th electricity
Resistance is connected with the inverter circuit subelement；The first end of the 3rd resistor is connected with the first end of first electric capacity,
The second end ground connection of the 3rd resistor；The first end of 6th resistance is connected with the first end of the 3rd electric capacity, described
The second end ground connection of 6th resistance；The power positive end of first operational amplifier is connected with the operating voltage input, institute
State the power supply negative terminal ground connection of the first operational amplifier.
4. the audio frequency phase switching circuit of power amplifier as claimed in claim 3, it is characterised in that the inverter circuit subelement
Including the 8th resistance, the 9th resistance, the tenth resistance, the 11st resistance, the 4th electric capacity, the 5th electric capacity, the second operational amplifier, institute
State the 5th resistance and the 7th resistance；Wherein：
Output end of the inverting input of second operational amplifier through the tenth resistance Yu first operational amplifier
Connection, the inverting input of second operational amplifier are also defeated through the 11st resistance and second operational amplifier
Go out end connection, the 5th electric capacity and the 11st resistor coupled in parallel, the in-phase input end of second operational amplifier is distinguished
Second end of first end, the first end of the 9th resistance and the 7th resistance with the 8th resistance is connected；9th electricity
The second end ground connection of resistance, the 4th electric capacity and the 9th resistor coupled in parallel；Second end of the 8th resistance and the work
Voltage input end connects；The output end of second operational amplifier also connects with the backward end of the audio differential signal outputs
Connect；The first end of 7th resistance is connected through the 5th resistance with the in-phase input end of first operational amplifier.
5. the audio frequency phase switching circuit of power amplifier as claimed in claim 4, it is characterised in that the inverter circuit subelement
Also include being used for the filter circuit for being filtered the voltage of the operating voltage input, the filter circuit includes the 6th electricity
Appearance and the 7th electric capacity；Wherein：
The first end of 6th electric capacity and the first end of the 7th electric capacity are connected with the operating voltage input, described
Second end of the 6th electric capacity and the second end of the 7th electric capacity are grounded.
6. the audio frequency phase switching circuit of power amplifier as claimed in claim 4, it is characterised in that the resistance of the tenth resistance and
The resistance of 11st resistance is equal.
7. the audio frequency phase switching circuit of the power amplifier as any one of claim 1 to 6, it is characterised in that the switching
On-off circuit unit includes alternative gating switch, and the alternative gating switch is two grade of three pin toggle switch, described to stir
First pin position of switch is connected with the audio signal input end, the crus secunda position of the toggle switch and the discharge circuit list
The second input connection of member, the 3rd pin position of the toggle switch is connected with the first input end of the discharge circuit unit.
8. a kind of sound equipment, it is characterised in that the sound equipment includes the audio phase of the power amplifier any one of claim 1 to 7
Position switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720506603.8U CN206807738U (en) | 2017-05-08 | 2017-05-08 | The audio frequency phase switching circuit and sound equipment of power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720506603.8U CN206807738U (en) | 2017-05-08 | 2017-05-08 | The audio frequency phase switching circuit and sound equipment of power amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN206807738U true CN206807738U (en) | 2017-12-26 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720506603.8U Expired - Fee Related CN206807738U (en) | 2017-05-08 | 2017-05-08 | The audio frequency phase switching circuit and sound equipment of power amplifier |
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| Country | Link |
|---|---|
| CN (1) | CN206807738U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206977A (en) * | 2018-01-11 | 2018-06-26 | 上海展扬通信技术有限公司 | Noise-reduction method, device and the computer readable storage medium of audio |
| CN110381412A (en) * | 2019-06-06 | 2019-10-25 | 深圳康佳电子科技有限公司 | A kind of device that realizing directive property sounding, method and electronic equipment |
-
2017
- 2017-05-08 CN CN201720506603.8U patent/CN206807738U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206977A (en) * | 2018-01-11 | 2018-06-26 | 上海展扬通信技术有限公司 | Noise-reduction method, device and the computer readable storage medium of audio |
| CN110381412A (en) * | 2019-06-06 | 2019-10-25 | 深圳康佳电子科技有限公司 | A kind of device that realizing directive property sounding, method and electronic equipment |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171226 Termination date: 20210508 |
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| CF01 | Termination of patent right due to non-payment of annual fee |