CN206061109U - A kind of single-ended audio signal turns differential signal circuit and wireless headset - Google Patents
A kind of single-ended audio signal turns differential signal circuit and wireless headset Download PDFInfo
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- CN206061109U CN206061109U CN201621060162.5U CN201621060162U CN206061109U CN 206061109 U CN206061109 U CN 206061109U CN 201621060162 U CN201621060162 U CN 201621060162U CN 206061109 U CN206061109 U CN 206061109U
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Abstract
This utility model belongs to voicefrequency circuit technical field, more particularly to a kind of single-ended audio signal turns differential signal circuit and wireless headset.In this utility model embodiment, single-ended audio signal turns differential signal circuit and the left input circuit of difference and the right input circuit of difference is increased on the basis of audio frequency single ended inputs, the single ended input of analogue audio frequency is optimized for into Differential Input, reduce the distortion factor, and reach satisfactory frequency response curve, stable, the little audio input source of distortion is reached with this.
Description
Technical field
This utility model belongs to voicefrequency circuit technical field, more particularly to a kind of single-ended audio signal turns differential signal circuit
And wireless headset.
Background technology
Current wireless headset, much has increase LINE IN analogue audio frequency inputs, and LIN IN analogue audio frequencies is single-ended
Signal input.In order to cost-effective, directly loudspeaker are directly given to using the difference audio output signal of bluetooth CSR.So increasing
Plus during LINE IN simulated audio signals, just without extra process, causing that the bluetooth differential signal distortion factor is low, frequency response is good.But
After LIN IN analogue audio frequencies are input to loudspeaker, the distortion factor is bigger than normal.
Utility model content
The purpose of this utility model embodiment is to provide a kind of single-ended audio signal to turn differential signal circuit and wireless ear
Machine, it is intended to solve present wireless headset and exist after LIN IN analogue audio frequencies are input to loudspeaker, distortion factor problem bigger than normal.
This utility model embodiment is achieved in that a kind of single-ended audio signal turns differential signal circuit, including audio frequency
Single ended inputs, the single-ended audio signal turn differential signal circuit also including the difference for connecting the audio frequency single ended inputs respectively
Point left input circuit and the right input circuit of difference, the left input circuit of the difference and the right input circuit of difference include：
Amplifier U1, amplifier U2, resistance R6, resistance R7, resistance R8, resistance R9, resistance R11, resistance R12, electric capacity C17, electricity
Hold C18, electric capacity C20, electric capacity C21 and electric capacity C22；
The outfan of amplifier U1 connects audio-source by the electric capacity C22, and the electric capacity C20 and resistance R7 are connected in parallel on institute
State between the negative input end of amplifier U1 and outfan, the positive input terminal of amplifier U1 connects reference voltage by the resistance R9
VREF, the negative input end of amplifier U1 connect the outfan of amplifier U2 by the resistance R12；
The outfan of amplifier U2 connects audio-source by the electric capacity C21, and the electric capacity C17 and resistance R8 are connected in parallel on institute
State between the negative input end of amplifier U2 and outfan, the positive input terminal of amplifier U2 connects reference voltage by the resistance R11
VREF, the negative input end of amplifier U2 connect the audio frequency single ended inputs by the resistance R6 and electric capacity C18 of series connection.
In said structure, the resistance R6 and resistance R8 is input amplitude-limiting resistance.
In said structure, the electric capacity C17 and electric capacity C20 is feedback circuit filter capacitor.
In said structure, the electric capacity C18 and electric capacity C22 is that Hz-KHz domain controls electric capacity.
The another object of this utility model embodiment is to provide a kind of wireless headset, including single-ended audio signal slip point
Signal circuit, including audio frequency single ended inputs, the single-ended audio signal turns differential signal circuit also to be included connecting described respectively
The left input circuit of difference and the right input circuit of difference of audio frequency single ended inputs, the left input circuit of the difference and the right input of difference
Circuit includes：
Amplifier U1, amplifier U2, resistance R6, resistance R7, resistance R8, resistance R9, resistance R11, resistance R12, electric capacity C17, electricity
Hold C18, electric capacity C20, electric capacity C21 and electric capacity C22；
The outfan of amplifier U1 connects audio-source by the electric capacity C22, and the electric capacity C20 and resistance R7 are connected in parallel on institute
State between the negative input end of amplifier U1 and outfan, the positive input terminal of amplifier U1 connects reference voltage by the resistance R9
VREF, the negative input end of amplifier U1 connect the outfan of amplifier U2 by the resistance R12；
The outfan of amplifier U2 connects audio-source by the electric capacity C21, and the electric capacity C17 and resistance R8 are connected in parallel on institute
State between the negative input end of amplifier U2 and outfan, the positive input terminal of amplifier U2 connects reference voltage by the resistance R11
VREF, the negative input end of amplifier U2 connect the audio frequency single ended inputs by the resistance R6 and electric capacity C18 of series connection.
In said structure, the resistance R6 and resistance R8 is input amplitude-limiting resistance.
In said structure, the electric capacity C17 and electric capacity C20 is feedback circuit filter capacitor.
In said structure, the electric capacity C18 and electric capacity C22 is that Hz-KHz domain controls electric capacity.
In this utility model embodiment, single-ended audio signal turns differential signal circuit on the basis of audio frequency single ended inputs
On increased the left input circuit of difference and the right input circuit of difference, the single ended input of analogue audio frequency is optimized for into Differential Input, drop
The low distortion factor, and satisfactory frequency response curve is reached, stable, the little audio input source of distortion is reached with this.
Description of the drawings
Fig. 1 is the structure chart that the single-ended audio signal that this utility model embodiment is provided turns differential signal circuit.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only to explain
This utility model, is not used to limit this utility model.
Fig. 1 shows that the single-ended audio signal that this utility model embodiment is provided turns the structure of differential signal circuit, in order to
It is easy to explanation, illustrate only the part related to this utility model embodiment.
A kind of single-ended audio signal turns differential signal circuit, including audio frequency single ended inputs 1, and the single-ended audio signal turns
Differential signal circuit also includes the right input electricity of the left input circuit 2 of difference and difference that connect the audio frequency single ended inputs 1 respectively
Road 3, the left input circuit 2 of the difference and the right input circuit of difference 3 include：
Amplifier U1, amplifier U2, resistance R6, resistance R7, resistance R8, resistance R9, resistance R11, resistance R12, electric capacity C17, electricity
Hold C18, electric capacity C20, electric capacity C21 and electric capacity C22；
The outfan of amplifier U1 connects audio-source by the electric capacity C22, and the electric capacity C20 and resistance R7 are connected in parallel on institute
State between the negative input end of amplifier U1 and outfan, the positive input terminal of amplifier U1 connects reference voltage by the resistance R9
VREF, the negative input end of amplifier U1 connect the outfan of amplifier U2 by the resistance R12；
The outfan of amplifier U2 connects audio-source by the electric capacity C21, and the electric capacity C17 and resistance R8 are connected in parallel on institute
State between the negative input end of amplifier U2 and outfan, the positive input terminal of amplifier U2 connects reference voltage by the resistance R11
VREF, the negative input end of amplifier U2 connect the audio frequency single ended inputs 1 by the resistance R6 and electric capacity C18 of series connection.
Used as one embodiment of this utility model, the resistance R6 and resistance R8 is input amplitude-limiting resistance.
Used as one embodiment of this utility model, the electric capacity C17 and electric capacity C20 is feedback circuit filter capacitor.
Used as one embodiment of this utility model, the electric capacity C18 and electric capacity C22 is that Hz-KHz domain controls electric capacity.
This utility model embodiment also provides a kind of wireless headset, including single-ended audio signal turns differential signal circuit, single
End audio signal turns differential signal circuit includes audio frequency single ended inputs 1, and the single-ended audio signal turns differential signal circuit also
Including the left input circuit 2 of difference and the right input circuit 3 of difference that connect the audio frequency single ended inputs 1 respectively, the difference is left
Input circuit 2 and the right input circuit of difference 3 include：
Amplifier U1, amplifier U2, resistance R6, resistance R7, resistance R8, resistance R9, resistance R11, resistance R12, electric capacity C17, electricity
Hold C18, electric capacity C20, electric capacity C21 and electric capacity C22；
The outfan of amplifier U1 connects audio-source by the electric capacity C22, and the electric capacity C20 and resistance R7 are connected in parallel on institute
State between the negative input end of amplifier U1 and outfan, the positive input terminal of amplifier U1 connects reference voltage by the resistance R9
VREF, the negative input end of amplifier U1 connect the outfan of amplifier U2 by the resistance R12；
The outfan of amplifier U2 connects audio-source by the electric capacity C21, and the electric capacity C17 and resistance R8 are connected in parallel on institute
State between the negative input end of amplifier U2 and outfan, the positive input terminal of amplifier U2 connects reference voltage by the resistance R11
VREF, the negative input end of amplifier U2 connect the audio frequency single ended inputs 1 by the resistance R6 and electric capacity C18 of series connection.
Used as one embodiment of this utility model, the resistance R6 and resistance R8 is input amplitude-limiting resistance.
Used as one embodiment of this utility model, the electric capacity C17 and electric capacity C20 is feedback circuit filter capacitor.
Used as one embodiment of this utility model, the electric capacity C18 and electric capacity C22 is that Hz-KHz domain controls electric capacity.
In this utility model embodiment, single-ended audio signal turns differential signal circuit on the basis of audio frequency single ended inputs
On increased the left input circuit of difference and the right input circuit of difference, the single ended input of analogue audio frequency is optimized for into Differential Input, drop
The low distortion factor, and satisfactory frequency response curve is reached, stable, the little audio input source of distortion is reached with this.
Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (8)
1. a kind of single-ended audio signal turns differential signal circuit, including audio frequency single ended inputs, it is characterised in that the single-ended sound
Frequency signal turns differential signal circuit also includes that the left input circuit of difference and difference that connect the audio frequency single ended inputs respectively are right
Input circuit, the left input circuit of the difference and the right input circuit of difference include：
Amplifier U1, amplifier U2, resistance R6, resistance R7, resistance R8, resistance R9, resistance R11, resistance R12, electric capacity C17, electric capacity
C18, electric capacity C20, electric capacity C21 and electric capacity C22；
The outfan of amplifier U1 connects audio-source by the electric capacity C22, and the electric capacity C20 and resistance R7 are connected in parallel on the fortune
Put between the negative input end of U1 and outfan, the positive input terminal of amplifier U1 meets reference voltage VREF by the resistance R9,
The negative input end of amplifier U1 connects the outfan of amplifier U2 by the resistance R12；
The outfan of amplifier U2 connects audio-source by the electric capacity C21, and the electric capacity C17 and resistance R8 are connected in parallel on the fortune
Put between the negative input end of U2 and outfan, the positive input terminal of amplifier U2 meets reference voltage VREF by the resistance R11,
The negative input end of amplifier U2 connects the audio frequency single ended inputs by the resistance R6 and electric capacity C18 of series connection.
2. single-ended audio signal as claimed in claim 1 turns differential signal circuit, it is characterised in that the resistance R6 and resistance
R8 is input amplitude-limiting resistance.
3. single-ended audio signal as claimed in claim 1 turns differential signal circuit, it is characterised in that the electric capacity C17 and electricity
Appearance C20 is feedback circuit filter capacitor.
4. single-ended audio signal as claimed in claim 1 turns differential signal circuit, it is characterised in that the electric capacity C18 and electricity
It is that Hz-KHz domain controls electric capacity to hold C22.
5. a kind of wireless headset, including single-ended audio signal turns differential signal circuit, the single-ended audio signal slip sub-signal
Circuit includes audio frequency single ended inputs, it is characterised in that the single-ended audio signal turns differential signal circuit also to be included connecting respectively
Connect the left input circuit of difference and the right input circuit of difference of the audio frequency single ended inputs, the left input circuit of the difference and difference
Right input circuit includes：
Amplifier U1, amplifier U2, resistance R6, resistance R7, resistance R8, resistance R9, resistance R11, resistance R12, electric capacity C17, electric capacity
C18, electric capacity C20, electric capacity C21 and electric capacity C22；
The outfan of amplifier U1 connects audio-source by the electric capacity C22, and the electric capacity C20 and resistance R7 are connected in parallel on the fortune
Put between the negative input end of U1 and outfan, the positive input terminal of amplifier U1 meets reference voltage VREF by the resistance R9,
The negative input end of amplifier U1 connects the outfan of amplifier U2 by the resistance R12；
The outfan of amplifier U2 connects audio-source by the electric capacity C21, and the electric capacity C17 and resistance R8 are connected in parallel on the fortune
Put between the negative input end of U2 and outfan, the positive input terminal of amplifier U2 meets reference voltage VREF by the resistance R11,
The negative input end of amplifier U2 connects the audio frequency single ended inputs by the resistance R6 and electric capacity C18 of series connection.
6. wireless headset as claimed in claim 5, it is characterised in that the resistance R6 and resistance R8 is input amplitude-limiting electricity
Resistance.
7. wireless headset as claimed in claim 5, it is characterised in that the electric capacity C17 and electric capacity C20 is feedback circuit filtering
Electric capacity.
8. wireless headset as claimed in claim 5, it is characterised in that the electric capacity C18 and electric capacity C22 is the control of Hz-KHz domain
Electric capacity processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621060162.5U CN206061109U (en) | 2016-09-18 | 2016-09-18 | A kind of single-ended audio signal turns differential signal circuit and wireless headset |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621060162.5U CN206061109U (en) | 2016-09-18 | 2016-09-18 | A kind of single-ended audio signal turns differential signal circuit and wireless headset |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206061109U true CN206061109U (en) | 2017-03-29 |
Family
ID=58370204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621060162.5U Active CN206061109U (en) | 2016-09-18 | 2016-09-18 | A kind of single-ended audio signal turns differential signal circuit and wireless headset |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206061109U (en) |
-
2016
- 2016-09-18 CN CN201621060162.5U patent/CN206061109U/en active Active
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