CN106331953A - Single-ended audio signal-to-differential signal circuit and wireless headphone - Google Patents
Single-ended audio signal-to-differential signal circuit and wireless headphone Download PDFInfo
- Publication number
- CN106331953A CN106331953A CN201610826935.4A CN201610826935A CN106331953A CN 106331953 A CN106331953 A CN 106331953A CN 201610826935 A CN201610826935 A CN 201610826935A CN 106331953 A CN106331953 A CN 106331953A
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- resistance
- electric capacity
- amplifier
- circuit
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
Abstract
The invention belongs to the technical field of audio circuit, and especially relates to a single-ended audio signal-to-differential signal circuit and a wireless headphone. According to an embodiment of the invention, the single-ended audio signal-to-differential signal circuit further comprises a left difference input circuit and a right differential input circuit on the basis of a single audio input end, and single-ended input of analog audio is optimized into differential input. Thus, the degree of distortion is reduced, a frequency response curve meeting the requirements is realized, and a stable and low-distortion audio input source is realized.
Description
Technical field
The invention belongs to voicefrequency circuit technical field, particularly relate to a kind of single-ended audio signal and turn differential signal circuit and nothing
Line earphone.
Background technology
Current wireless headset, much has increase LINE IN analogue audio frequency input, and LIN IN analogue audio frequency is single-ended
Signal inputs.In order to cost-effective, the difference audio output signal of bluetooth CSR is directly used directly to be given to loudspeaker.So increasing
When adding LINE IN simulated audio signal, just without extra process, causing the bluetooth differential signal distortion factor low, frequency response is good.But
After LIN IN analogue audio frequency is input to loudspeaker, the distortion factor is bigger than normal.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of single-ended audio signal to turn differential signal circuit and wireless headset, purport
Exist after LIN IN analogue audio frequency is input to loudspeaker solving present wireless headset, the problem that the distortion factor is bigger than normal.
The embodiment of the present invention is achieved in that a kind of single-ended audio signal turns differential signal circuit, single-ended including audio frequency
Input, described single-ended audio signal turns differential signal circuit and also includes connecting respectively a difference left side for described audio frequency single ended inputs
Input circuit and the right input circuit of difference, the left input circuit of described difference and the right input circuit of difference all 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 described amplifier U1 connects audio-source by described electric capacity C22, and described electric capacity C20 and resistance R7 is connected in parallel on institute
Stating between the negative input end of amplifier U1 and outfan, the positive input terminal of described amplifier U1 connects reference voltage by described resistance R9
VREF, the negative input end of described amplifier U1 connects the outfan of described amplifier U2 by described resistance R12；
The outfan of described amplifier U2 connects audio-source by described electric capacity C21, and described electric capacity C17 and resistance R8 is connected in parallel on institute
Stating between the negative input end of amplifier U2 and outfan, the positive input terminal of described amplifier U2 connects reference voltage by described resistance R11
VREF, the negative input end of described amplifier U2 connects described audio frequency single ended inputs by the described resistance R6 and electric capacity C18 of series connection.
In said structure, described resistance R6 and resistance R8 is input amplitude-limiting resistance.
In said structure, described electric capacity C17 and electric capacity C20 is feedback circuit filter capacitor.
In said structure, described electric capacity C18 and electric capacity C22 is that Hz-KHz territory controls electric capacity.
The another object of the embodiment of the present invention is to provide a kind of wireless headset, including single-ended audio signal slip sub-signal
Circuit, including audio frequency single ended inputs, described single-ended audio signal turns differential signal circuit and also includes connecting described audio frequency respectively
The left input circuit of difference of single ended inputs and the right input circuit of difference, the left input circuit of described difference and the right input circuit of difference
All 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 described amplifier U1 connects audio-source by described electric capacity C22, and described electric capacity C20 and resistance R7 is connected in parallel on institute
Stating between the negative input end of amplifier U1 and outfan, the positive input terminal of described amplifier U1 connects reference voltage by described resistance R9
VREF, the negative input end of described amplifier U1 connects the outfan of described amplifier U2 by described resistance R12；
The outfan of described amplifier U2 connects audio-source by described electric capacity C21, and described electric capacity C17 and resistance R8 is connected in parallel on institute
Stating between the negative input end of amplifier U2 and outfan, the positive input terminal of described amplifier U2 connects reference voltage by described resistance R11
VREF, the negative input end of described amplifier U2 connects described audio frequency single ended inputs by the described resistance R6 and electric capacity C18 of series connection.
In said structure, described resistance R6 and resistance R8 is input amplitude-limiting resistance.
In said structure, described electric capacity C17 and electric capacity C20 is feedback circuit filter capacitor.
In said structure, described electric capacity C18 and electric capacity C22 is that Hz-KHz territory controls electric capacity.
In embodiments of the present invention, single-ended audio signal turns differential signal circuit and increases on the basis of audio frequency single ended inputs
Add the left input circuit of difference and the right input circuit of difference, the single ended input of analogue audio frequency has been optimized for Differential Input, reduces
The distortion factor, and reach satisfactory frequency response curve, reach stable with this, the audio input source that distortion is little.
Accompanying drawing explanation
Fig. 1 is the structure chart that the single-ended audio signal that the embodiment of the present invention provides turns differential signal circuit.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows that the single-ended audio signal that the embodiment of the present invention provides turns the structure of differential signal circuit, for the ease of
Illustrate, illustrate only the part relevant to the embodiment of the present invention.
A kind of single-ended audio signal turns differential signal circuit, and including audio frequency single ended inputs 1, described single-ended audio signal turns
Differential signal circuit also includes the left input circuit of difference 2 and the difference right input electricity connecting described audio frequency single ended inputs 1 respectively
Road 3, the left input circuit of described difference 2 and the right input circuit of difference 3 all 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 described amplifier U1 connects audio-source by described electric capacity C22, and described electric capacity C20 and resistance R7 is connected in parallel on institute
Stating between the negative input end of amplifier U1 and outfan, the positive input terminal of described amplifier U1 connects reference voltage by described resistance R9
VREF, the negative input end of described amplifier U1 connects the outfan of described amplifier U2 by described resistance R12；
The outfan of described amplifier U2 connects audio-source by described electric capacity C21, and described electric capacity C17 and resistance R8 is connected in parallel on institute
Stating between the negative input end of amplifier U2 and outfan, the positive input terminal of described amplifier U2 connects reference voltage by described resistance R11
VREF, the negative input end of described amplifier U2 connects described audio frequency single ended inputs 1 by the described resistance R6 and electric capacity C18 of series connection.
As one embodiment of the invention, described resistance R6 and resistance R8 is input amplitude-limiting resistance.
As one embodiment of the invention, described electric capacity C17 and electric capacity C20 is feedback circuit filter capacitor.
As one embodiment of the invention, described electric capacity C18 and electric capacity C22 is that Hz-KHz territory controls electric capacity.
The embodiment of the present invention also provides for a kind of wireless headset, turns differential signal circuit, single-ended sound including single-ended audio signal
Frequently signal turns differential signal circuit and includes that audio frequency single ended inputs 1, described single-ended audio signal turn differential signal circuit and also include
Connect the left input circuit of difference 2 and the right input circuit of difference 3 of described audio frequency single ended inputs 1, the left input of described difference respectively
Circuit 2 and the right input circuit of difference 3 all 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 described amplifier U1 connects audio-source by described electric capacity C22, and described electric capacity C20 and resistance R7 is connected in parallel on institute
Stating between the negative input end of amplifier U1 and outfan, the positive input terminal of described amplifier U1 connects reference voltage by described resistance R9
VREF, the negative input end of described amplifier U1 connects the outfan of described amplifier U2 by described resistance R12；
The outfan of described amplifier U2 connects audio-source by described electric capacity C21, and described electric capacity C17 and resistance R8 is connected in parallel on institute
Stating between the negative input end of amplifier U2 and outfan, the positive input terminal of described amplifier U2 connects reference voltage by described resistance R11
VREF, the negative input end of described amplifier U2 connects described audio frequency single ended inputs 1 by the described resistance R6 and electric capacity C18 of series connection.
As one embodiment of the invention, described resistance R6 and resistance R8 is input amplitude-limiting resistance.
As one embodiment of the invention, described electric capacity C17 and electric capacity C20 is feedback circuit filter capacitor.
As one embodiment of the invention, described electric capacity C18 and electric capacity C22 is that Hz-KHz territory controls electric capacity.
In embodiments of the present invention, single-ended audio signal turns differential signal circuit and increases on the basis of audio frequency single ended inputs
Add the left input circuit of difference and the right input circuit of difference, the single ended input of analogue audio frequency has been optimized for Differential Input, reduces
The distortion factor, and reach satisfactory frequency response curve, reach stable with this, the audio input source that distortion is little.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (8)
1. single-ended audio signal turns a differential signal circuit, including audio frequency single ended inputs, it is characterised in that described single-ended sound
Frequently signal turns differential signal circuit and also includes connecting respectively the left input circuit of difference of described audio frequency single ended inputs and difference is right
Input circuit, the left input circuit of described difference and the right input circuit of difference all 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 described amplifier U1 connects audio-source by described electric capacity C22, and described electric capacity C20 and resistance R7 is connected in parallel on described fortune
Putting between the negative input end of U1 and outfan, the positive input terminal of described amplifier U1 meets reference voltage VREF by described resistance R9,
The negative input end of described amplifier U1 connects the outfan of described amplifier U2 by described resistance R12；
The outfan of described amplifier U2 connects audio-source by described electric capacity C21, and described electric capacity C17 and resistance R8 is connected in parallel on described fortune
Putting between the negative input end of U2 and outfan, the positive input terminal of described amplifier U2 meets reference voltage VREF by described resistance R11,
The negative input end of described amplifier U2 connects described audio frequency single ended inputs by the described 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 described 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 described electric capacity C17 and electricity
Holding 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 described electric capacity C18 and electricity
Holding C22 is that Hz-KHz territory controls electric capacity.
5. a wireless headset, turns differential signal circuit, described single-ended audio signal slip sub-signal including single-ended audio signal
Circuit includes audio frequency single ended inputs, it is characterised in that described single-ended audio signal turns differential signal circuit and also includes connecting respectively
Connect the left input circuit of difference and the right input circuit of difference of described audio frequency single ended inputs, the left input circuit of described difference and difference
Right input circuit all 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 described amplifier U1 connects audio-source by described electric capacity C22, and described electric capacity C20 and resistance R7 is connected in parallel on described fortune
Putting between the negative input end of U1 and outfan, the positive input terminal of described amplifier U1 meets reference voltage VREF by described resistance R9,
The negative input end of described amplifier U1 connects the outfan of described amplifier U2 by described resistance R12；
The outfan of described amplifier U2 connects audio-source by described electric capacity C21, and described electric capacity C17 and resistance R8 is connected in parallel on described fortune
Putting between the negative input end of U2 and outfan, the positive input terminal of described amplifier U2 meets reference voltage VREF by described resistance R11,
The negative input end of described amplifier U2 connects described audio frequency single ended inputs by the described resistance R6 and electric capacity C18 of series connection.
6. wireless headset as claimed in claim 5, it is characterised in that described resistance R6 and resistance R8 is input amplitude-limiting electricity
Resistance.
7. wireless headset as claimed in claim 5, it is characterised in that described 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 described electric capacity C18 and electric capacity C22 is the control of Hz-KHz territory
Electric capacity processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826935.4A CN106331953A (en) | 2016-09-18 | 2016-09-18 | Single-ended audio signal-to-differential signal circuit and wireless headphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826935.4A CN106331953A (en) | 2016-09-18 | 2016-09-18 | Single-ended audio signal-to-differential signal circuit and wireless headphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106331953A true CN106331953A (en) | 2017-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610826935.4A Pending CN106331953A (en) | 2016-09-18 | 2016-09-18 | Single-ended audio signal-to-differential signal circuit and wireless headphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106331953A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355200A (en) * | 2011-08-01 | 2012-02-15 | 北京航空航天大学 | Single-ended input and differential output parallel dual-frequency low noise amplifier and design method thereof |
| CN204206118U (en) * | 2014-09-16 | 2015-03-11 | 广州惠威电声科技股份有限公司 | A kind of single ended input turns the circuit of difference output |
| EP2913922A1 (en) * | 2014-02-28 | 2015-09-02 | Telefonaktiebolaget L M Ericsson (publ) | A low noise amplifier circuit |
| CN204633754U (en) * | 2015-03-30 | 2015-09-09 | 苏州固基电子科技有限公司 | A kind of conversion single-ended signal device |
| CN105721980A (en) * | 2014-12-05 | 2016-06-29 | 王丽香 | Audio differential signal implementation method |
-
2016
- 2016-09-18 CN CN201610826935.4A patent/CN106331953A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355200A (en) * | 2011-08-01 | 2012-02-15 | 北京航空航天大学 | Single-ended input and differential output parallel dual-frequency low noise amplifier and design method thereof |
| EP2913922A1 (en) * | 2014-02-28 | 2015-09-02 | Telefonaktiebolaget L M Ericsson (publ) | A low noise amplifier circuit |
| CN204206118U (en) * | 2014-09-16 | 2015-03-11 | 广州惠威电声科技股份有限公司 | A kind of single ended input turns the circuit of difference output |
| CN105721980A (en) * | 2014-12-05 | 2016-06-29 | 王丽香 | Audio differential signal implementation method |
| CN204633754U (en) * | 2015-03-30 | 2015-09-09 | 苏州固基电子科技有限公司 | A kind of conversion single-ended signal device |
Non-Patent Citations (1)
| Title |
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| 黄智伟: "《基于TI器件的模拟电路设计》", 31 July 2014 * |
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