CN107396242A - A kind of audio gain circuit - Google Patents
A kind of audio gain circuit Download PDFInfo
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- CN107396242A CN107396242A CN201710671606.1A CN201710671606A CN107396242A CN 107396242 A CN107396242 A CN 107396242A CN 201710671606 A CN201710671606 A CN 201710671606A CN 107396242 A CN107396242 A CN 107396242A
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- 230000005236 sound signal Effects 0.000 claims abstract description 19
- 238000005728 strengthening Methods 0.000 claims abstract description 8
- 239000004065 semiconductor Substances 0.000 claims description 45
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
The invention discloses a kind of audio gain circuit, including audio input end, low-frequency gain module, high-frequency gain module and audio output, audio input end is used for input audio signal；Low-frequency gain module is electrically connected with audio input end for strengthening the low frequency part of audio signal；High-frequency gain module is electrically connected with audio input end for strengthening the HFS of audio signal；Audio output is electrically connected with low-frequency gain module, high-frequency gain module for exporting the audio signal after gain process respectively.The design carries out gain process to the HFS and low frequency part of audio, makes the fuller solid of tonequality of the audio signal of output, and tonequality is improved, and makes people's body and mind happy.
Description
Technical field
The present invention relates to electronic applications, particularly one kind to be used for the stereosonic audio gain circuit of liquid crystal TV set.
Background technology
Present television set is switched to LCD TV comprehensively via traditional CRT TVs, the more does the more thin in appearance, image quality is got over
It is more clear to come, and main flow large scale screen resolution reaches 4K, however, when we play television channel or film using LCD TV
When, tonequality output is thin, and tonequality is not so good as old-fashioned CRT television sets, can not heard after volume is heightened, but high and low frequency
Tonequality is not obviously improved still.
The content of the invention
Increase in order to solve the above technical problems, being used for the stereosonic audio of liquid crystal TV set it is an object of the invention to provide one kind
Beneficial circuit.
The technical solution adopted by the present invention is：
A kind of audio gain circuit, including audio input end, for input audio signal；
Low-frequency gain module, it is electrically connected with audio input end for strengthening the low frequency part of audio signal；
High-frequency gain module, it is electrically connected with audio input end for strengthening the HFS of audio signal；
Audio output, it is electrically connected with low-frequency gain module, high-frequency gain module passes through gain for output respectively
Audio signal after processing.
The low-frequency gain module includes triode Q11, triode Q21, resistance R41, resistance R51, resistance R61, resistance
R71 and electric capacity C3, the triode Q11 ground level are electrically connected with audio input end, triode Q11 colelctor electrode and three poles
Pipe Q21 ground level is electrically connected with, and triode Q11 emitter stage is electrically connected with resistance R61, resistance R71 successively, triode Q11
Emitter stage also successively with resistance R41, resistance R51, triode Q21 colelctor electrode, audio output be electrically connected with, the electric capacity
C3 is connected in parallel with resistance R41.
Present invention additionally comprises first switch module, the first switch module includes metal-oxide-semiconductor Q4 and the first control signal
Input, metal-oxide-semiconductor Q4 source class are electrically connected with electric capacity C3 one end, metal-oxide-semiconductor Q4 drain electrode and electric capacity C3 other end electricity
Property connection, the electric connection of metal-oxide-semiconductor Q4 grid and the first control signal input.
The high-frequency gain module includes triode Q12, triode Q22, resistance R42, resistance R52, resistance R62, resistance
R72 and electric capacity C4, the triode Q12 ground level are electrically connected with audio input end, triode Q12 colelctor electrode and three poles
Pipe Q22 ground level is electrically connected with, and triode Q12 emitter stage is electrically connected with resistance R62, resistance R72 successively, triode Q12
Emitter stage also successively with resistance R42, resistance R52, triode Q22 colelctor electrode, audio output be electrically connected with, the electric capacity
C4 is connected in parallel with resistance R72.
Present invention additionally comprises second switch module, the second switch module includes metal-oxide-semiconductor Q3 and the second control signal
Input, metal-oxide-semiconductor Q3 drain are electrically connected with electric capacity C4 one end, and one end of metal-oxide-semiconductor Q3 source class and resistance R72 is electrical
Connection, metal-oxide-semiconductor Q3 grid and the second control signal input are electrically connected with.
Present invention additionally comprises audio power amplification module, the audio power amplification module is electrically connected with audio output
Exported for driving load.
Beneficial effects of the present invention：
The present invention is additionally arranged low-frequency gain module and high-frequency gain module in voicefrequency circuit, to the HFS of audio
Gain process is carried out with low frequency part, makes the fuller solid of tonequality of the audio signal of output, tonequality is improved, and allows people
Body and mind is happy.
Brief description of the drawings
The embodiment of the present invention is described further below in conjunction with the accompanying drawings.
Fig. 1 is the circuit theory diagrams of the present invention.
Fig. 2 is the simulated response schematic diagram of low-frequency gain module of the present invention.
Fig. 3 is the simulated response schematic diagram of high-frequency gain module of the present invention.
Fig. 4 is the simulated response schematic diagram of low-frequency gain module and high-frequency gain module of the present invention.
Embodiment
As shown in figure 1, a kind of audio gain circuit, including audio input end 1, low-frequency gain module, high-frequency gain module
And audio output 2, audio input end 1 are used for the audio signal inputted in liquid crystal TV set SOC；Low-frequency gain module and sound
Frequency input terminal 1 is electrically connected with for strengthening the low frequency part of audio signal；High-frequency gain module electrically connects with audio input end 1
Connect for strengthening the HFS of audio signal；Audio output 2 is electrical with low-frequency gain module, high-frequency gain module respectively
Connect for exporting the audio signal after gain process.The design increases to the HFS and low frequency part of audio
Benefit is managed, and makes the fuller solid of tonequality of the audio signal of output, and tonequality is improved, and makes people's body and mind happy.
The low-frequency gain module includes triode Q11, triode Q21, resistance R41, resistance R51, resistance R61, resistance
R71 and electric capacity C3, the triode Q11 ground level and audio input end 1 are electrically connected with, triode Q11 colelctor electrode and three
Pole pipe Q21 ground level is electrically connected with, and triode Q11 emitter stage is electrically connected with resistance R61, resistance R71 successively, triode
Q11 emitter stage is also electrically connected with resistance R41, resistance R51, triode Q21 colelctor electrode, audio output 2 successively, described
Electric capacity C3 is connected in parallel with resistance R41.
Present invention additionally comprises first switch module 3, the first switch module 3 includes the control letters of metal-oxide-semiconductor Q4 and first
Number input 31, metal-oxide-semiconductor Q4 source class are electrically connected with electric capacity C3 one end, and metal-oxide-semiconductor Q4 drain electrode is another with electric capacity C3's
End is electrically connected with, and metal-oxide-semiconductor Q4 grid is electrically connected with the first control signal input 31.First control signal input 31 to
Metal-oxide-semiconductor Q4 sends control signal to control metal-oxide-semiconductor Q4 on or off.When metal-oxide-semiconductor Q4 is turned on, low-frequency gain module does not have
There is gain effect；When metal-oxide-semiconductor Q4 ends, low-frequency gain module has gain effect.
The high-frequency gain module includes triode Q12, triode Q22, resistance R42, resistance R52, resistance R62, resistance
R72 and electric capacity C4, the triode Q12 ground level and audio input end 1 are electrically connected with, triode Q12 colelctor electrode and three
Pole pipe Q22 ground level is electrically connected with, and triode Q12 emitter stage is electrically connected with resistance R62, resistance R72 successively, triode
Q12 emitter stage is also electrically connected with resistance R42, resistance R52, triode Q22 colelctor electrode, audio output 2 successively, described
Electric capacity C4 is connected in parallel with resistance R72.
Present invention additionally comprises second switch module 4, the second switch module 4 includes the control letters of metal-oxide-semiconductor Q3 and second
Number input 41, metal-oxide-semiconductor Q3 drain are electrically connected with electric capacity C4 one end, metal-oxide-semiconductor Q3 source class and resistance R72 one end
It is electrically connected with, metal-oxide-semiconductor Q3 grid is electrically connected with the second control signal input 41.Second control signal input 41 to
Metal-oxide-semiconductor Q4 sends control signal to control metal-oxide-semiconductor Q3 on or off.When metal-oxide-semiconductor Q3 is turned on, low-frequency gain module has
Gain effect；When metal-oxide-semiconductor Q3 ends, low-frequency gain module does not have gain effect.
In the present embodiment, resistance R41 and resistance R42 is that same resistance R4, resistance R51 and resistance R52 are same
Resistance R5；Resistance R61 and resistance R62 is same resistance R6；Resistance R71 and resistance R72 is same resistance R7；Triode
Q11 and triode Q12 is same triode Q1；Triode Q21 and triode Q22 is same triode Q2.
Of the invention mainly to utilize in RC circuits, the impedance of electric capacity realizes audio with the principle of the change change of frequency
The gain of low frequency part, HFS.
The gain of low-frequency gain module：First control signal input 31 sends control signal control metal-oxide-semiconductor to metal-oxide-semiconductor Q4
Q4 ends, and the second control signal input 41 sends control signal control metal-oxide-semiconductor Q3 cut-offs to metal-oxide-semiconductor Q4, now in circuit
Voltage gain Av=(R6+R7+Zf)/R6+R7, wherein, Zf=(R4//j ω * C3)+R5 is electric capacity C3, resistance R4, resistance R5 institutes
In the total resistance of branch road, when incoming frequency is relatively low, electric capacity C3 impedance levels off to infinity, Zf=R4+R5；When input frequency
When rate is higher, electric capacity C3 impedance tends to 0, Zf=R5, and therefore, with the raising of incoming frequency, voltage gain Av numerical value is got over
It is low, it is inversely proportional.As shown in Fig. 2 in figure, abscissa is incoming frequency value, and ordinate is yield value, lower limiting frequency F0=1/ (2
π R4*C3), upper cut off frequency F1=(R4+R6+R7+R5)/{ 2 π C3*R4 (R6+R7+R5) }.In the present embodiment, voltage gain
Rise up to 12db.
The gain of high-frequency gain module：First control signal input 31 sends control signal control metal-oxide-semiconductor to metal-oxide-semiconductor Q4
Q4 is turned on, and the second control signal input 41 sends control signal control metal-oxide-semiconductor Q3 conductings to metal-oxide-semiconductor Q4, now in circuit
Voltage gain Av1=(Zs+R5)/Zs, wherein Zs=(1/j ω * C4//R7)+R6 is branch where electric capacity C4, resistance R6, resistance R7
The total resistance on road, when incoming frequency is relatively low, electric capacity C4 impedance levels off to infinity, Zs=R7+R6, when incoming frequency compared with
Gao Shi, electric capacity C4 impedance tend to 0, Zs=R6, and therefore, with the raising of incoming frequency, voltage gain Av1 numerical value is higher,
It is directly proportional.As shown in figure 3, in figure, abscissa is incoming frequency value, and ordinate is yield value, lower limiting frequency F2=(R7+R6+
R5)/{ 2 π R7*C4* (R6+R5) }, upper cut off frequency F3=(R7+R6)/(2 π * R7*C4*R6), in the present embodiment, voltage increase
The rise of benefit is up to 12db.
The gain simultaneously of low-frequency gain module, high-frequency gain module：First control signal input 31 sends to metal-oxide-semiconductor Q4 and controlled
Signal control metal-oxide-semiconductor Q4 cut-offs processed, the second control signal input 41 send control signal control metal-oxide-semiconductor Q3 to metal-oxide-semiconductor Q4 and led
Logical, gain situation is combined for gain, the gain of high-frequency gain module of above-mentioned low-frequency gain module, as shown in figure 4, in figure,
Abscissa is incoming frequency value, and ordinate is yield value, and the frequency characteristic of the voltage gain in low frequency and high-frequency range is simultaneously
Get a promotion.
Present invention additionally comprises audio power amplification module, the audio power amplification module electrically connects with audio output 2
Connect and exported for driving load.
The present invention on the negative-feedback circuit of triode Q1 and triode Q2 compositions by combining resistance, electric capacity uses,
The gain of circuit can be made there is the discrete devices such as frequency characteristic, all resistance of circuit devcie, electric capacity, metal-oxide-semiconductor, triode,
Without integrated circuit and operational amplifier, cost is cheap, has the great market competitiveness.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to above-mentioned embodiment, as long as with
Essentially identical means realize that the technical scheme of the object of the invention is belonged within protection scope of the present invention.
Claims (6)
- A kind of 1. audio gain circuit, it is characterised in that including：Audio input end (1), for input audio signal；Low-frequency gain module, it is electrically connected with audio input end (1) for strengthening the low frequency part of audio signal；High-frequency gain module, it is electrically connected with audio input end (1) for strengthening the HFS of audio signal；Audio output (2), it is electrically connected with respectively with low-frequency gain module, high-frequency gain module for output by gain Audio signal after reason.
- A kind of 2. audio gain circuit according to claim 1, it is characterised in that：The low-frequency gain module includes three poles Pipe Q11, triode Q21, resistance R41, resistance R51, resistance R61, resistance R71 and electric capacity C3, the ground level of the triode Q11 It is electrically connected with audio input end (1), triode Q11 colelctor electrode is electrically connected with triode Q21 ground level, triode Q11 Emitter stage be electrically connected with successively with resistance R61, resistance R71, triode Q11 emitter stage also successively with resistance R41, resistance R51, triode Q21 colelctor electrode, audio output (2) are electrically connected with, and the electric capacity C3 and resistance R41 is connected in parallel.
- A kind of 3. audio gain circuit according to claim 2, it is characterised in that：Also include first switch module (3), institute Stating first switch module (3) includes metal-oxide-semiconductor Q4 and the first control signal input (31), the metal-oxide-semiconductor Q4 source class and electric capacity C3 one end is electrically connected with, and metal-oxide-semiconductor Q4 drain electrode is electrically connected with the electric capacity C3 other end, metal-oxide-semiconductor Q4 grid and the first control Signal input part (31) processed is electrically connected with.
- A kind of 4. audio gain circuit according to claim 1, it is characterised in that：The high-frequency gain module includes three poles Pipe Q12, triode Q22, resistance R42, resistance R52, resistance R62, resistance R72 and electric capacity C4, the ground level of the triode Q12 It is electrically connected with audio input end (1), triode Q12 colelctor electrode is electrically connected with triode Q22 ground level, triode Q12 Emitter stage be electrically connected with successively with resistance R62, resistance R72, triode Q12 emitter stage also successively with resistance R42, resistance R52, triode Q22 colelctor electrode, audio output (2) are electrically connected with, and the electric capacity C4 and resistance R72 is connected in parallel.
- A kind of 5. audio gain circuit according to claim 4, it is characterised in that：Also include second switch module (4), institute Stating second switch module (4) includes metal-oxide-semiconductor Q3 and the second control signal input (41), the metal-oxide-semiconductor Q3 drain and electric capacity C4 one end is electrically connected with, and metal-oxide-semiconductor Q3 source class is electrically connected with resistance R72 one end, metal-oxide-semiconductor Q3 grid and the second control Signal input part (41) is electrically connected with.
- A kind of 6. audio gain circuit according to claim 1, it is characterised in that：Also include audio power amplification module, The audio power amplification module is electrically connected with audio output (2) and exported for driving load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710671606.1A CN107396242B (en) | 2017-08-08 | 2017-08-08 | Audio gain circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710671606.1A CN107396242B (en) | 2017-08-08 | 2017-08-08 | Audio gain circuit |
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| Publication Number | Publication Date |
|---|---|
| CN107396242A true CN107396242A (en) | 2017-11-24 |
| CN107396242B CN107396242B (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710671606.1A Active CN107396242B (en) | 2017-08-08 | 2017-08-08 | Audio gain circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1491480A (en) * | 2001-02-14 | 2004-04-21 | 汤姆森特许公司 | Digital audio processor |
| CN101998206A (en) * | 2009-08-20 | 2011-03-30 | 鸿富锦精密工业（深圳）有限公司 | Audio compensating device |
| CN104469611A (en) * | 2014-11-19 | 2015-03-25 | 成都创图科技有限公司 | Audio processing system for widening range |
| CN104869503A (en) * | 2015-03-23 | 2015-08-26 | 深圳市冠旭电子有限公司 | Equal loudness curve-based dynamic low-frequency enhancement method and system |
| CN207166749U (en) * | 2017-08-08 | 2018-03-30 | 广东长虹电子有限公司 | A kind of audio gain circuit |
-
2017
- 2017-08-08 CN CN201710671606.1A patent/CN107396242B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1491480A (en) * | 2001-02-14 | 2004-04-21 | 汤姆森特许公司 | Digital audio processor |
| CN101998206A (en) * | 2009-08-20 | 2011-03-30 | 鸿富锦精密工业（深圳）有限公司 | Audio compensating device |
| CN104469611A (en) * | 2014-11-19 | 2015-03-25 | 成都创图科技有限公司 | Audio processing system for widening range |
| CN104936095A (en) * | 2014-11-19 | 2015-09-23 | 成都冠深科技有限公司 | Audio processing system based on triode common-emitter symmetric amplification circuit |
| CN104869503A (en) * | 2015-03-23 | 2015-08-26 | 深圳市冠旭电子有限公司 | Equal loudness curve-based dynamic low-frequency enhancement method and system |
| CN207166749U (en) * | 2017-08-08 | 2018-03-30 | 广东长虹电子有限公司 | A kind of audio gain circuit |
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| Publication number | Publication date |
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| CN107396242B (en) | 2024-02-06 |
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