CN207219030U - Stero set circuit and audio frequency apparatus - Google Patents
Stero set circuit and audio frequency apparatus Download PDFInfo
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- CN207219030U CN207219030U CN201721325622.7U CN201721325622U CN207219030U CN 207219030 U CN207219030 U CN 207219030U CN 201721325622 U CN201721325622 U CN 201721325622U CN 207219030 U CN207219030 U CN 207219030U
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Abstract
The utility model discloses a kind of stero set circuit and audio frequency apparatus, wherein, stero set circuit includes amplifier power supply and reference voltage circuit, L channel input circuit, R channel input circuit and sound channel isolation circuit, the power input of the L channel input circuit, the R channel input circuit and the power input end node of the sound channel isolation circuit are powered with the amplifier and the power output end of reference voltage circuit is connected, the reference voltage input terminal of the L channel input circuit is powered with the amplifier and the reference voltage output terminal of reference voltage circuit is connected, the reference voltage input terminal of R channel input circuit is connected with the reference voltage output terminal of the sound channel isolation circuit.The utility model is powered using amplifier and reference voltage circuit provides the reference voltage of L channel input circuit, sound channel isolation circuit provides the reference voltage of R channel input circuit, reduce the signal cross-talk of left and right acoustic channels circuit, and then improve the cross-talk index of stero set circuit.
Description
Technical field
It the utility model is related to audio product technical field, more particularly to a kind of stero set circuit and audio frequency apparatus.
Background technology
In present audio frequency apparatus, it is cross-talk to have an index, it represent two sound channels of stereo component system middle left and right it
Between isolation, cross-talk index is defined by cross-talk dB calculated values, and cross-talk dB calculated values calculation is 20lg (L_out/R_
Out), the big explanation left channel signals of cross-talk dB calculated values low, the small explanation L channel of cross-talk dB calculated values that is crosstalked into R channel degree
Signal cross-talk is high to R channel degree.
Existing stero set circuit is as shown in figure 1, including amplifier power supply and reference voltage circuit, L channel input electricity
Road and R channel input circuit, amplifier power supply and reference voltage circuit are used to provide L channel input circuit and R channel input electricity
Road power supply and reference voltage, the L channel input circuit and R channel input circuit are used for input and output audio signal；
So, in the stero set circuit course of work, the audio signal inputted to L channel input circuit may be by reference to electricity
Pressure input is inputted to R channel input circuit so that the signal of R channel input circuit is interfered.Therefore, it is existing stereo
Cross-talk defect be present in acoustics circuit.
Utility model content
Main purpose of the present utility model is to provide stero set circuit, it is intended to improves and believes between audio frequency apparatus two-channel
Number cross-interference issue.
To achieve the above object, the utility model proposes stero set circuit include amplifier power and reference voltage electricity
Road, L channel input circuit, R channel input circuit and sound channel isolation circuit；The amplifier power supply and the electricity of reference voltage circuit
Source output terminal, the power input of the L channel input circuit, the power input of the R channel input circuit and described
The reference voltage output terminal of the power input interconnection of sound channel isolation circuit, amplifier power supply and reference voltage circuit with it is described
The reference voltage input terminal connection of L channel input circuit, the reference voltage output terminal of the sound channel isolation circuit and the right sound
The reference voltage input terminal connection of road input circuit；Wherein, amplifier power supply and reference voltage circuit, for for the left sound
Road input circuit, the R channel input circuit and the sound channel isolation circuit provide power supply, and, inputted for the L channel
Circuit provides reference voltage；The sound channel isolation circuit, for receiving the power supply of the amplifier power supply and reference voltage circuit simultaneously
Reference voltage is provided for the R channel input circuit.
Preferably, the sound channel isolation circuit includes first resistor, second resistance, the first electric capacity and the second electric capacity；It is described
The first end of first resistor be the sound channel isolation circuit power input, the second end of the first resistor, described second
The first end interconnection of the first end of resistance, the first end of first electric capacity and second electric capacity, its node is the sound channel
The reference voltage output terminal of isolation circuit；Second end of the second resistance, the second end of first electric capacity and described second
Second end of electric capacity is grounded.
Preferably, the amplifier power supply and reference voltage circuit include the first power supply, 3rd resistor, the 4th resistance, the 5th
Resistance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity；The positive pole of first power supply and the 3rd electricity
The first end connection of resistance, the negative pole ground connection of first power supply, the second end of the 3rd resistor, the first of the 4th resistance
The first end interconnection at end, the first end of the 3rd electric capacity, the first end of the 4th electric capacity and the 5th electric capacity, its node
For amplifier power supply and the power output end of reference voltage circuit, the second end of the 3rd electric capacity, the 4th electric capacity the
Second end of two ends and described 5th electric capacity is grounded, the second end of the 4th resistance, the first end of the 5th resistance,
The first end of 6th electric capacity and the first end interconnection of the 7th electric capacity, its node are amplifier power supply and reference voltage
The reference voltage output terminal of circuit, the second end of the 5th resistance, the second end of the 6th electric capacity and the 7th electric capacity
The second end interconnection be grounded.
Preferably, the L channel input circuit includes the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth
Resistance, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 11st electric capacity, the 12nd electric capacity and the first amplifier；9th electricity
The first end of appearance is used to input left channel audio signal, and the second end of the 9th electric capacity connects with the first end of the 7th resistance
Connect, the second end, the 8th resistance first end, the first end of the tenth electric capacity and first amplification of the 7th resistance
The in-phase input end interconnection of device, the second end of the 8th electric capacity are connected with the second end of the tenth electric capacity, and its node is institute
The reference voltage input terminal of L channel input circuit is stated, the first end of the 8th electric capacity is grounded, and the second of the 8th electric capacity
End is connected with the first end of the 6th resistance, the second end of the 6th resistance, the 9th resistance first end, the described tenth
The inverting input of the first end of one electric capacity and first amplifier interconnects, the second end of the 9th resistance, the described tenth
Second end of one electric capacity, the output end of first amplifier, the first end of the tenth resistance and the 12nd electric capacity
First end interconnects, and its node is used to export left channel audio signal, the second end of the tenth resistance and the 12nd electric capacity
The ground connection at the second end, the negative supply input end grounding of first amplifier, the positive supply input of first amplifier
For the power input of the L channel input circuit.
Preferably, the amplification coefficient of first amplifier is 1.
Preferably, the R channel input circuit includes the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th
Resistance, the 15th resistance, the 13rd electric capacity, the 14th electric capacity, the 15th electric capacity, the 16th electric capacity, the 17th electric capacity, second are put
Big device；The first end of 14th electric capacity is used to input right channel audio signal, the second end of the 14th electric capacity and institute
State the first end connection of the 12nd resistance, the second end of the 12nd resistance, the first end of the 13rd resistance, described the
The in-phase input end of the first end of 15 electric capacity and second amplifier interconnect, the second end of the 13rd resistance with it is described
The second end connection of 15th electric capacity, its connecting node are the reference voltage input terminal of the R channel input circuit, described the
The first end ground connection of 13 electric capacity, the second end of the 13rd electric capacity is connected with the first end of the 11st resistance, described
Second end of the 11st resistance, the first end of the 14th resistance, the first end of the 16th electric capacity and described second are put
The reverse input end interconnection of big device, the second end of the 14th resistance, the second end of the 16th electric capacity, the described 15th
The output end interconnection of the first end of resistance, the first end of the 17th electric capacity and second amplifier, its connecting node are used
In output right channel audio signal, the second end of the 15th resistance and the second end of the 17th electric capacity are grounded, institute
The second amplifier negative supply input end grounding is stated, the positive supply input of second amplifier is the R channel input circuit
Power input.
Preferably, the amplification coefficient of second amplifier is 1.
Accordingly, the utility model also proposes a kind of audio frequency apparatus, including stero set circuit as described above；Its
In, stero set circuit includes amplifier power supply and reference voltage circuit, L channel input circuit, R channel input circuit and sound
Road isolation circuit；Power output end, the power supply of the L channel input circuit of the amplifier power supply and reference voltage circuit are defeated
Enter the power input interconnection of end, the power input of the R channel input circuit and the sound channel isolation circuit, the fortune
The reference voltage output terminal for putting power supply and reference voltage circuit is connected with the reference voltage input terminal of the L channel input circuit,
The reference voltage output terminal of the sound channel isolation circuit is connected with the reference voltage input terminal of the R channel input circuit；Its
In, amplifier power supply and reference voltage circuit, for for the L channel input circuit, the R channel input circuit and institute
State sound channel isolation circuit and power supply is provided, and, provide reference voltage for the L channel input circuit；The sound channel isolation electricity
Road, for providing reference voltage for the R channel input circuit.
The utility model proposes stero set circuit by the amplifier power and reference voltage circuit provide described in
The power supply of L channel input circuit, R channel input circuit and the sound channel isolation circuit, and powered by the amplifier and
Reference voltage circuit provides the reference voltage of the L channel input circuit, and it is defeated that the sound channel isolation circuit provides the R channel
Enter the reference voltage of circuit, the reference voltage of left and right acoustic channels input circuit is provided by the way of separation, it is defeated to reduce left and right acoustic channels
Enter the signal cross-talk of circuit, and then improve the cross-talk index of stero set circuit and audio frequency apparatus.
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 this stero set circuit in the prior art；
Fig. 2 is the high-level schematic functional block diagram of the embodiment of the utility model stero set circuit one；
Fig. 3 is the electrical block diagram of the embodiment of the utility model sound channel isolation circuit one；
Fig. 4 is the electrical block diagram of another embodiment of the utility model stero set circuit.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 10 | Amplifier is powered and reference voltage circuit | C1~C17 | First electric capacity to the 17th electric capacity |
| 20 | L channel input circuit | OP1 | First amplifier |
| 30 | R channel input circuit | OP2 | Second amplifier |
| 40 | Sound channel isolation circuit | V1 | First power supply |
| R1~R15 | First resistor is to the 15th resistance |
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
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.
Main purpose of the present utility model is to provide a kind of stero set circuit, it is intended to reduces the signal between two-channel
Crosstalk, improve the cross-talk index of stero set circuit.
Referring to Fig. 2, in the embodiment of the utility model stero set circuit one, stero set circuit supplies including amplifier
Electricity and reference voltage circuit 10, L channel input circuit 20, R channel input circuit 30 and sound channel isolation circuit 40；Amplifier is powered
And the power output end of reference voltage circuit 10, the power input of L channel input circuit 20, R channel input circuit 30
The reference voltage of power input and the interconnection of the power input of sound channel isolation circuit 40, amplifier power supply and reference voltage circuit 10
Output end is connected with the reference voltage input terminal of L channel input circuit 20, the reference voltage output terminal 10 of sound channel isolation circuit with
The reference voltage input terminal connection of the R channel input circuit 30.
Wherein, amplifier power supply and reference voltage circuit 10 are used for for L channel input circuit 20, R channel input circuit 30
And the offer power supply of sound channel isolation circuit 40, and, provide reference voltage, sound channel isolation circuit 40 for L channel input circuit 20
Receive the power supply of amplifier power supply and reference voltage circuit 10 and provide reference voltage for R channel input circuit 30.Due to L channel
Input circuit 20, without direct connection relational, has been effectively isolated the train of signal of L channel input circuit 20 with R channel input circuit 30
R channel input circuit 30 is disturbed, improves the cross-talk index of stero set circuit and audio frequency apparatus.
Referring to Fig. 3, in the embodiment of the utility model sound channel isolation circuit one, sound channel isolation circuit 40 includes first resistor
R1, second resistance R2, the first electric capacity C1 and the second electric capacity C2, first resistor R1 first end are defeated for the power supply of sound channel isolation circuit 40
Enter and hold Vcc_in, the ends of first resistor R1 second and second resistance R2 first ends, the first electric capacity C1 first ends and the second electric capacity C2 the
One end interconnects, and its node is the reference voltage output terminal Vref_out of sound channel isolation circuit 40；The ends of second resistance R2 second, first
The ends of electric capacity C1 second and the interconnection of second the second ends of electric capacity C2, its node ground connection GND；First resistor R1 and second resistance R2 is used for electricity
Source partial pressure, the first electric capacity C1 and the second electric capacity C2 are used for power filter, and the first electric capacity C1 is much larger than the second electric capacity C2, can obtain
Bigger filtering frequency range is obtained, and it is simple in construction, it is easy to accomplish.
Based on the content of the embodiment of the utility model sound channel isolation circuit one, referring to Fig. 4, preferably, amplifier power supply and
Reference voltage circuit 10 includes the first power supply V1,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 3rd electric capacity C3, the 4th
Electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7；First power supply V1 positive poles are connected with 3rd resistor R3 first ends,
First power supply V1 negative poles are grounded, the ends of 3rd resistor R3 second, the 4th resistance R4 first ends, the 3rd electric capacity C3 first ends, the 4th electricity
Hold C4 first ends and the interconnection of the 5th electric capacity C5 first ends, its node is that amplifier is powered and the power supply of reference voltage circuit 10 exports
End, the 3rd the second ends of electric capacity C3, the 4th the second ends of electric capacity C4 and the 5th the second ends of electric capacity C5 are grounded GND, the 4th resistance R4 the
Two ends, the 5th resistance R5 first ends, the 6th electric capacity C6 first ends and the interconnection of the 7th electric capacity C7 first ends, its node are powered for amplifier
And the reference voltage output terminal of reference voltage circuit 10, the 5th the second ends of resistance R5, the 6th the second ends of electric capacity C6 and the 7th electric capacity
The interconnection of the ends of C7 second is grounded, and the first power supply V1 passes through 3rd resistor R3, the 4th resistance R4 and the 5th resistance R5 partial pressures.
In the present embodiment, the 3rd electric capacity C3, the 4th electric capacity C4 and the 5th electric capacity C5 composition filter circuits, amplifier confession can be filtered out
The power output end harmonic wave of electricity and reference voltage circuit 10, the 6th electric capacity C6 and the 7th electric capacity C7 composition filter circuits, can be filtered out
Amplifier is powered and the reference voltage output terminal harmonic wave of reference voltage circuit 10.
It is preferred that the 4th resistance R4 is equal with the 5th resistance R5 resistances and is much larger than 3rd resistor R3, its amplifier is set to power
And the magnitude of voltage of the out-put supply of reference voltage circuit 10 ensures amplifier power supply and reference voltage close to the first power supply V1 magnitudes of voltage
The stable output of circuit 10.
Preferably, L channel input circuit 20 includes the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance
R9, the tenth resistance R10, the 8th electric capacity C8, the 9th electric capacity C9, the tenth electric capacity C10, the 11st electric capacity C11, the 12nd electric capacity C12,
First amplifier OP1；9th electric capacity C9 first end is used to input left channel audio signal L_in, the 9th the second ends of electric capacity C9 with
7th resistance R7 first ends connect, the 7th the second ends of resistance R7, the 8th resistance R8 first ends, the tenth electric capacity C10 first ends and the
One amplifier OP1 in-phase input ends are interconnected, and the 8th the second ends of electric capacity C8 are connected with the tenth the second ends of electric capacity C10, and its node is a left side
The reference voltage input terminal of sound channel input circuit 20, the 8th electric capacity C8 first ends ground connection GND, the 8th the second ends of electric capacity C8 and the 6th
Resistance R6 first end connection, the 6th the second ends of resistance R6, the 9th resistance R9 first ends, the 11st electric capacity C11 first ends and the
One amplifier OP1 inverting input interconnection, second ends of the 9th resistance R9, the 11st the second ends of electric capacity C11, the first amplification
Device OP1 output ends, the tenth resistance R10 first ends and the 12nd electric capacity C12 interconnection, its node are used to export left channel audio signal
L_out, the tenth the second ends of resistance R10 are grounded GND with the 12nd the second ends of electric capacity C12, and the first amplifier OP1 negative supply is defeated
The positive supply input for entering end ground connection GND, the first amplifier OP1 is the power input of L channel input circuit 20.
It is preferred that the first amplifier OP1 amplification coefficient is 1, and formed by the 9th resistance R9 and the 11st electric capacity C11
Negative feedback loop, ensure that output signal is undistorted.
Preferably, R channel input circuit 30 include the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13,
14th resistance R14, the 15th resistance R15, the 13rd electric capacity C13, the 14th electric capacity C14, the 15th electric capacity C15, the 16th
Electric capacity C16, the 17th electric capacity C17, the second amplifier OP2；14th electric capacity C14 first ends are used to input right channel audio signal
R_in, the 14th the second ends of electric capacity C14 are connected with the 12nd resistance R12 first ends, the 12nd the second ends of resistance R12, the 13rd
Resistance R13 first ends, the 15th electric capacity C15 first ends and the interconnection of the second amplifier OP2 positive inputs, the 13rd resistance R13
Second end is connected with the 15th the second ends of electric capacity C15, and its connecting node is the reference voltage input terminal of R channel input circuit 30,
13rd electric capacity C13 first ends are grounded GND, and the 13rd the second ends of electric capacity C13 are connected with the 11st resistance R11 first ends, and the tenth
One the second ends of resistance R11, the 14th resistance R14 first ends, the 16th electric capacity C16 first ends and the second amplifier OP2 it is anti-phase
Input interconnects, the 14th the second ends of resistance R14, the 16th the second ends of electric capacity C16, the 15th resistance R15 first ends, the 17th
Electric capacity C17 first ends and the interconnection of the second amplifier OP2 output end, its connecting node are used to export right channel audio signal R_
Out, the 15th the second ends of resistance R15 are grounded GND, the second amplifier OP2 negative supply input end groundings with the 17th electric capacity C17
GND, the second amplifier OP2 positive supply input are the power input of R channel input circuit 30.
It is preferred that the second amplifier OP2 amplification coefficient is 1, and by the 14th resistance R14 and the 16th electric capacity C16
Negative feedback loop is formed, ensures that output signal is undistorted.
First resistor R1, second resistance R2, the 4th resistance R4 and the 5th resistance R5 resistance are equal；6th resistance R6,
Seven resistance R7, the 8th resistance R8, the 9th resistance R9, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13 and
14 resistance R14 resistance is equal；Tenth resistance R10 is equal with the 15th resistance R15 resistance；First resistor R1 resistances are more than
6th resistance R6 resistances, the 6th resistance R6 resistances are more than the tenth resistance R10 resistances, and the tenth resistance R10 resistances are more than 3rd resistor
R3 resistances, when the signal of L channel input circuit 20 is by the 8th resistance R8, the 4th resistance R4, the electricity of first resistor R1 and the 13rd
When hindering R13 to R channel 30 signal input part of input circuit, because first resistor R1 and the 4th resistance R4 resistances are big, signal passes through
After first resistor R1 and the 4th resistance R4 partial pressures, the signal intensity that the signal input part of R channel input circuit 30 receives is small,
Crosstalk signal is small, and then reduces the signal cross-talk between sound channel, improves the cross-talk index of discharge circuit.
Preferably, the first electric capacity C1, the 3rd electric capacity C3, the 4th electric capacity C4 and the 6th electric capacity C6 are equal；Second electric capacity C2,
Five electric capacity C5 and the 7th electric capacity C7 are equal；First electric capacity C1 is more than the second electric capacity C2, and the first electric capacity C1 and the second electric capacity C2
Ratio is not less than 100, the first electric capacity C1 and the second electric capacity C2 parallel filterings, due to the first electric capacity C1 and the second electric capacity C2 ratios compared with
Greatly, bigger filtering frequency range can be obtained.
Hereinafter, with reference to Fig. 1 to Fig. 4, the operation principle of the utility model stero set circuit is illustrated：
L channel input circuit 20 inputs left channel audio signal L_in and is input to by the 9th electric capacity C9, the 7th resistance R7
First amplifier OP1 in-phase input ends, the first amplifier OP1 because amplification coefficient be 1, the first amplifier OP1 output signals with
Left audio input signal is identical, and output signal exports L channel after the tenth resistance R10 and the 12nd electric capacity C12 filtering
Audio signal L_out, R channel input circuit 30 input right channel audio signal R_in by the 14th electric capacity C14, the 12nd
Resistance R12 is input to the second amplifier OP2 in-phase input ends, and the second amplifier OP2 is because amplification coefficient is 1, the second amplifier
OP2 output signals are identical with right audio channel input signal, and output signal passes through the 15th resistance R15 and the 17th electric capacity C17
Right channel audio signal R_out is exported after filtering, amplifier power supply and the power output end offer first of reference voltage circuit 10 are put
The reference voltage output of big device OP1 and the second amplifier OP2 positive supply input voltage, amplifier power supply and reference voltage circuit 10
End provides the first amplifier OP1 reference voltage, and the reference voltage output terminal of sound channel isolation circuit 40 provides the second amplifier OP2's
Reference voltage, by providing the reference voltage of L channel input circuit 20 and R channel input circuit 30 respectively, can effectively it subtract
Signal cross-talk problem between small left and right acoustic channels, and sound channel isolation circuit 40 is simple in construction, only by first resistor R1, the second electricity
Hinder R2, the first electric capacity C1, the second electric capacity C2 composition connection, it is easy to accomplish, here, the signal of L channel input circuit 20 can also pass through
First resistor R1 and the 4th resistance R4 is crosstalked into the signal input part of R channel input circuit 30, due to first resistor R1, the 4th
Resistance R4 resistances are big, and the signal of R channel input circuit 30 is crosstalked into after partial pressure current limliting and is diminished, equally reaches reduction train of signal
Disturb problem and improve the cross-talk index purpose of discharge circuit.
The utility model also proposes a kind of audio frequency apparatus, and the audio frequency apparatus includes stero set circuit as described above,
The concrete structure of the stero set circuit is with reference to above-described embodiment, because this audio frequency apparatus employs above-mentioned all embodiments
Whole technical schemes, therefore all beneficial effects at least caused by the technical scheme with above-described embodiment, it is not another herein
One repeats.Wherein, the audio frequency apparatus can be television set, audio amplifier or bluetooth earphone etc., not enumerate herein.
Preferred embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model,
Every equivalent structure change under inventive concept of the present utility model, made using the utility model specification and accompanying drawing content
Change, or directly/be used in other related technical areas indirectly and be included in scope of patent protection of the present utility model.
Claims (8)
1. a kind of stero set circuit, it is characterised in that including amplifier power supply and reference voltage circuit, L channel input electricity
Road, R channel input circuit and sound channel isolation circuit；
The amplifier power supply and the power output end of reference voltage circuit, the power input of the L channel input circuit, institute
State the power input of R channel input circuit and the power input interconnection of the sound channel isolation circuit, amplifier power supply and
The reference voltage output terminal of reference voltage circuit is connected with the reference voltage input terminal of the L channel input circuit, the sound channel
The reference voltage output terminal of isolation circuit is connected with the reference voltage input terminal of the R channel input circuit；Wherein,
Amplifier power supply and reference voltage circuit, for for the L channel input circuit, the R channel input circuit and
The sound channel isolation circuit provides power supply, and, provide reference voltage for the L channel input circuit；
The sound channel isolation circuit, for receiving the power supply of the amplifier power supply and reference voltage circuit and being that the R channel is defeated
Enter circuit and reference voltage is provided.
2. stero set circuit as claimed in claim 1, it is characterised in that the sound channel isolation circuit includes the first electricity
Resistance, second resistance, the first electric capacity and the second electric capacity；
The first end of the first resistor be the sound channel isolation circuit power input, the second end of the first resistor,
The first end interconnection of the first end of the second resistance, the first end of first electric capacity and second electric capacity, its node are
The reference voltage output terminal of the sound channel isolation circuit；Second end of the second resistance, first electric capacity the second end and
Second end of second electric capacity is grounded.
3. stero set circuit as claimed in claim 1, it is characterised in that the amplifier power supply and reference voltage circuit bag
Include the first power supply, 3rd resistor, the 4th resistance, the 5th resistance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity,
Seven electric capacity；
The positive pole of first power supply and the first end of 3rd resistor connect, the negative pole ground connection of first power supply, and the described 3rd
Second end of resistance, the first end of the 4th resistance, the first end of the 3rd electric capacity, the first end of the 4th electric capacity and
The first end interconnection of 5th electric capacity, its node is the power output end of amplifier power supply and reference voltage circuit, described
Second end of the 3rd electric capacity, second end of the 4th electric capacity and the second end of the 5th electric capacity be grounded, the 4th electricity
The first end of the second end, the first end of the 5th resistance, the first end of the 6th electric capacity and the 7th electric capacity that hinder is mutual
Connect, its node is powered for the amplifier and the reference voltage output terminal of reference voltage circuit, the second end of the 5th resistance, institute
State the second end of the 6th electric capacity and the second end interconnection of the 7th electric capacity is grounded.
4. stero set circuit as claimed in claim 1, it is characterised in that the L channel input circuit includes the 6th electricity
Resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 11st electric capacity,
12nd electric capacity and the first amplifier；
The first end of 9th electric capacity is used to input left channel audio signal, the second end and the described 7th of the 9th electric capacity
The first end connection of resistance, the second end of the 7th resistance, the 8th resistance first end, the first end of the tenth electric capacity
And the in-phase input end interconnection of first amplifier, the second end of the 8th electric capacity connects with the second end of the tenth electric capacity
Connecing, its node is the reference voltage input terminal of the L channel input circuit, the first end ground connection of the 8th electric capacity, described the
Second end of eight electric capacity is connected with the first end of the 6th resistance, the second end of the 6th resistance, the 9th resistance
The reverse input end interconnection of one end, the first end of the 11st electric capacity and first amplifier, the of the 9th resistance
Two ends, the second end of the 11st electric capacity, the output end of first amplifier, the first end of the tenth resistance and described
The first end interconnection of 12nd electric capacity, its node are used to export left channel audio signal, the second end of the tenth resistance and institute
State the ground connection at the 12nd the second end of electric capacity, the negative supply input end grounding of first amplifier, first amplifier
Positive supply input is the power input of the L channel input circuit.
5. stero set circuit as claimed in claim 4, it is characterised in that the amplification coefficient of first amplifier is 1.
6. stero set circuit as claimed in claim 1, it is characterised in that the R channel input circuit includes the 11st
Resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 15th resistance, the 13rd electric capacity, the 14th electric capacity, the 15th
Electric capacity, the 16th electric capacity, the 17th electric capacity, the second amplifier；
The first end of 14th electric capacity is used to input right channel audio signal, the second end of the 14th electric capacity with it is described
The first end connection of 12nd resistance, the second end of the 12nd resistance, the first end of the 13rd resistance, the described tenth
The in-phase input end of the first end of five electric capacity and second amplifier interconnects, the second end of the 13rd resistance and described the
15 electric capacity the second end connection, its connecting node be the R channel input circuit reference voltage input terminal, the described tenth
The first end ground connection of three electric capacity, the second end of the 13rd electric capacity is connected with the first end of the 11st resistance, and described the
Second end of 11 resistance, the first end of the 14th resistance, the first end of the 16th electric capacity and second amplification
The inverting input interconnection of device, the second end of the 14th resistance, the second end of the 16th electric capacity, the 15th electricity
The output end interconnection of the first end of resistance, the first end of the 17th electric capacity and second amplifier, its connecting node are used for
Right channel audio signal is exported, the second end of the 15th resistance and the second end of the 17th electric capacity are grounded, described
Second amplifier negative supply input end grounding, the positive supply input of second amplifier is the R channel input circuit
Power input.
7. stero set circuit as claimed in claim 6, it is characterised in that the amplification coefficient of second amplifier is 1.
8. a kind of audio frequency apparatus, it is characterised in that including the stero set circuit as described in claim 1-7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721325622.7U CN207219030U (en) | 2017-10-12 | 2017-10-12 | Stero set circuit and audio frequency apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721325622.7U CN207219030U (en) | 2017-10-12 | 2017-10-12 | Stero set circuit and audio frequency apparatus |
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| Publication Number | Publication Date |
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| CN207219030U true CN207219030U (en) | 2018-04-10 |
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ID=61820920
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721325622.7U Expired - Fee Related CN207219030U (en) | 2017-10-12 | 2017-10-12 | Stero set circuit and audio frequency apparatus |
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| CN (1) | CN207219030U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110321098A (en) * | 2019-06-21 | 2019-10-11 | 维沃移动通信有限公司 | A kind of terminal device, audio frequency broadcast system and voicefrequency circuit |
| CN112118517A (en) * | 2019-06-19 | 2020-12-22 | 华为技术有限公司 | Audio chip and terminal |
-
2017
- 2017-10-12 CN CN201721325622.7U patent/CN207219030U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112118517A (en) * | 2019-06-19 | 2020-12-22 | 华为技术有限公司 | Audio chip and terminal |
| CN112118517B (en) * | 2019-06-19 | 2022-04-08 | 荣耀终端有限公司 | Audio chip and terminal |
| CN110321098A (en) * | 2019-06-21 | 2019-10-11 | 维沃移动通信有限公司 | A kind of terminal device, audio frequency broadcast system and voicefrequency circuit |
| CN110321098B (en) * | 2019-06-21 | 2023-02-07 | 维沃移动通信有限公司 | Terminal equipment, audio playing system and audio circuit |
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