CN107396242B - Audio gain circuit - Google Patents
Audio gain circuit Download PDFInfo
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- CN107396242B CN107396242B CN201710671606.1A CN201710671606A CN107396242B CN 107396242 B CN107396242 B CN 107396242B CN 201710671606 A CN201710671606 A CN 201710671606A CN 107396242 B CN107396242 B CN 107396242B
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- resistor
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- 230000005236 sound signal Effects 0.000 claims abstract description 19
- 230000002708 enhancing effect Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 27
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims 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
- 238000013459 approach Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004088 simulation Methods 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 an audio gain circuit, which comprises an audio input end, a low-frequency gain module, a high-frequency gain module and an audio output end, wherein the audio input end is used for inputting audio signals; the low-frequency gain module is electrically connected with the audio input end and used for enhancing a low-frequency part of the audio signal; the high-frequency gain module is electrically connected with the audio input end and used for enhancing a high-frequency part of the audio signal; the audio output end is electrically connected with the low-frequency gain module and the high-frequency gain module respectively and is used for outputting the audio signal after gain processing. The design carries out gain processing on the high-frequency part and the low-frequency part of the audio, so that the tone quality of the output audio signal is plump and three-dimensional, the tone quality is improved, and the human body is comfortable.
Description
Technical Field
The invention relates to the field of electronics, in particular to an audio gain circuit for stereo of a liquid crystal television.
Background
At present, the television is fully switched from the traditional CRT television to the LCD television, the thinner the appearance is, the more and more clear the image quality is, and the resolution of a main stream large-size screen reaches 4K, however, when the LCD television is used for playing television channels or movies, the tone quality output is thin, the tone quality is inferior to that of the old CRT television, the tone quality can be heard after the tone volume is increased, but the tone quality of high frequency and low frequency is still not obviously improved.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide an audio gain circuit for stereo of a liquid crystal television.
The technical scheme adopted by the invention is as follows:
an audio gain circuit comprises an audio input end for inputting an audio signal;
the low-frequency gain module is electrically connected with the audio input end and used for enhancing the low-frequency part of the audio signal;
the high-frequency gain module is electrically connected with the audio input end and used for enhancing the high-frequency part of the audio signal;
the audio output end is electrically connected with the low-frequency gain module and the high-frequency gain module respectively and used for outputting the audio signals subjected to gain processing.
The low-frequency gain module comprises a triode Q1, a triode Q2, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C3, wherein the base level of the triode Q1 is electrically connected with the audio input end, the collector of the triode Q1 is electrically connected with the base level of the triode Q2, the emitter of the triode Q1 is electrically connected with the resistor R6 and the resistor R7 in sequence, the emitter of the triode Q1 is electrically connected with the resistor R4, the resistor R5, the collector of the triode Q2 and the audio output end in sequence, and the capacitor C3 is connected with the resistor R4 in parallel.
The invention further comprises a first switch module, wherein the first switch module comprises an MOS tube Q4 and a first control signal input end, a source stage of the MOS tube Q4 is electrically connected with one end of the capacitor C3, a drain electrode of the MOS tube Q4 is electrically connected with the other end of the capacitor C3, and a grid electrode of the MOS tube Q4 is electrically connected with the first control signal input end.
The high-frequency gain module comprises a triode Q12, a triode Q22, a resistor R42, a resistor R52, a resistor R62, a resistor R72 and a capacitor C4, wherein the base level of the triode Q12 is electrically connected with the audio input end, the collector of the triode Q12 is electrically connected with the base level of the triode Q22, the emitter of the triode Q12 is electrically connected with the resistor R62 and the resistor R72 in sequence, the emitter of the triode Q12 is electrically connected with the resistor R42, the resistor R52, the collector of the triode Q22 and the audio output end in sequence, and the capacitor C4 is connected with the resistor R72 in parallel.
The invention further comprises a second switch module, wherein the second switch module comprises an MOS tube Q3 and a second control signal input end, the drain stage of the MOS tube Q3 is electrically connected with one end of a capacitor C4, the source stage of the MOS tube Q3 is electrically connected with one end of a resistor R72, and the grid electrode of the MOS tube Q3 is electrically connected with the second control signal input end.
The invention further comprises an audio power amplification module which is electrically connected with the audio output end and used for driving the load output.
The invention has the beneficial effects that:
the invention adds the low-frequency gain module and the high-frequency gain module in the audio circuit to carry out gain processing on the high-frequency part and the low-frequency part of the audio, so that the tone quality of the output audio signal is plump and three-dimensional, the tone quality is improved, and the human body is comfortable.
Drawings
The following describes the embodiments of the present invention further with reference to the drawings.
Fig. 1 is a schematic circuit diagram of the present invention.
FIG. 2 is a schematic diagram of the simulated response of the low frequency gain module of the present invention.
Fig. 3 is a schematic diagram of the simulation response of the high frequency gain module of the present invention.
FIG. 4 is a schematic diagram of the simulated response of the low frequency gain module and the high frequency gain module of the present invention.
Detailed Description
As shown in fig. 1, an audio gain circuit includes an audio input terminal 1, a low-frequency gain module, a high-frequency gain module, and an audio output terminal 2, wherein the audio input terminal 1 is used for inputting an audio signal in an SOC of a liquid crystal television; the low-frequency gain module is electrically connected with the audio input end 1 and used for enhancing a low-frequency part of the audio signal; the high-frequency gain module is electrically connected with the audio input end 1 and used for enhancing a high-frequency part of the audio signal; the audio output end 2 is electrically connected with the low-frequency gain module and the high-frequency gain module respectively and is used for outputting the audio signal after gain processing. The design carries out gain processing on the high-frequency part and the low-frequency part of the audio, so that the tone quality of the output audio signal is plump and three-dimensional, the tone quality is improved, and the human body is comfortable.
The low-frequency gain module comprises a triode Q1, a triode Q2, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C3, wherein the base level of the triode Q1 is electrically connected with the audio input end 1, the collector of the triode Q1 is electrically connected with the base level of the triode Q2, the emitter of the triode Q1 is electrically connected with the resistor R6 and the resistor R7 in sequence, the emitter of the triode Q1 is electrically connected with the resistor R4, the resistor R5, the collector of the triode Q2 and the audio output end 2 in sequence, and the capacitor C3 is connected with the resistor R4 in parallel.
The invention further comprises a first switch module 3, wherein the first switch module 3 comprises a MOS tube Q4 and a first control signal input end 31, a source stage of the MOS tube Q4 is electrically connected with one end of the capacitor C3, a drain electrode of the MOS tube Q4 is electrically connected with the other end of the capacitor C3, and a grid electrode of the MOS tube Q4 is electrically connected with the first control signal input end 31. The first control signal input terminal 31 sends a control signal to the MOS transistor Q4 to control on or off of the MOS transistor Q4. When the MOS tube Q4 is conducted, the low-frequency gain module does not have a gain effect; when the MOS transistor Q4 is cut off, the low-frequency gain module has a gain effect.
The high-frequency gain module comprises a triode Q12, a triode Q22, a resistor R42, a resistor R52, a resistor R62, a resistor R72 and a capacitor C4, wherein the base level of the triode Q12 is electrically connected with the audio input end 1, the collector of the triode Q12 is electrically connected with the base level of the triode Q22, the emitter of the triode Q12 is electrically connected with the resistor R62 and the resistor R72 in sequence, the emitter of the triode Q12 is electrically connected with the resistor R42, the resistor R52, the collector of the triode Q22 and the audio output end 2 in sequence, and the capacitor C4 is connected with the resistor R72 in parallel.
The invention further comprises a second switch module 4, wherein the second switch module 4 comprises a MOS tube Q3 and a second control signal input end 41, the drain of the MOS tube Q3 is electrically connected with one end of the capacitor C4, the source of the MOS tube Q3 is electrically connected with one end of the resistor R72, and the grid of the MOS tube Q3 is electrically connected with the second control signal input end 41. The second control signal input terminal 41 sends a control signal to the MOS transistor Q4 to control the on or off of the MOS transistor Q3. When the MOS tube Q3 is conducted, the low-frequency gain module has a gain effect; when the MOS transistor Q3 is cut off, the low-frequency gain module has no gain effect.
In this embodiment, the resistor R41 and the resistor R42 are the same resistor R4, and the resistor R51 and the resistor R52 are the same resistor R5; the resistor R61 and the resistor R62 are the same resistor R6; the resistor R71 and the resistor R72 are the same resistor R7; the triode Q11 and the triode Q12 are the same triode Q1; transistor Q21 and transistor Q22 are the same transistor Q2.
The invention mainly utilizes the principle that the impedance of the capacitor changes along with the change of frequency in the RC circuit to realize the gains of the low-frequency part and the high-frequency part of the audio.
Gain of the low frequency gain module: the first control signal input end 31 sends a control signal to the MOS tube Q4 to control the MOS tube Q4 to be cut off, the second control signal input end 41 sends a control signal to the MOS tube Q4 to control the MOS tube Q3 to be cut off, and at the moment, the voltage gain Av= (R6+R7+Zf)/R6+R7 in the circuit, wherein Zf= (R4// jω+C3) +R5 is the total impedance value of the branch where the capacitor C3, the resistor R4 and the resistor R5 are located, when the input frequency is lower, the impedance of the capacitor C3 approaches infinity, and Zf=R4+R5; when the input frequency is high, the impedance of the capacitor C3 tends to be 0, zf=r5, and therefore, as the input frequency increases, the lower the value of the voltage gain Av, the inverse ratio is. As shown in fig. 2, the abscissa indicates input frequency values, the ordinate indicates gain values, the lower cutoff frequency f0=1/(2ρr4×c3), and the upper cutoff frequency f1= (r4+r6+r7+r5)/{ 2ρc3×r4 (r6+r7+r5) }. In this embodiment, the voltage gain may be increased by up to 12db.
Gain of the high frequency gain module: the first control signal input end 31 sends a control signal to the MOS transistor Q4 to control the MOS transistor Q4 to be turned on, the second control signal input end 41 sends a control signal to the MOS transistor Q4 to control the MOS transistor Q3 to be turned on, and at this time, the voltage gain av1= (zs+r5)/Zs in the circuit, where zs= (1/jω) C4// r7) +r6 is the total impedance value of the branch where the capacitor C4, the resistor R6 and the resistor R7 are located, when the input frequency is lower, the impedance of the capacitor C4 approaches infinity, zs=r7+r6, when the input frequency is higher, the impedance of the capacitor C4 tends to 0, zs=r6, and therefore, as the value of the voltage gain Av1 is higher, the higher the input frequency is in proportion. As shown in fig. 3, the abscissa indicates the input frequency value, the ordinate indicates the gain value, the lower cutoff frequency f2= (r7+r6+r5)/{ 2pi r7×c4×c6+r5) }, and the upper cutoff frequency f3= (r7+r6)/(2pi×r7×c4×r6), in this embodiment, the voltage gain can be increased by 12db.
The low-frequency gain module and the high-frequency gain module gain simultaneously: the first control signal input end 31 sends a control signal to the MOS transistor Q4 to control the MOS transistor Q4 to be turned off, the second control signal input end 41 sends a control signal to the MOS transistor Q4 to control the MOS transistor Q3 to be turned on, the gain condition is that the gain of the low-frequency gain module and the gain of the high-frequency gain module are combined, as shown in fig. 4, the abscissa indicates an input frequency value, the ordinate indicates a gain value, and the frequency characteristics of the voltage gain in the low-frequency and high-frequency ranges are simultaneously improved.
The invention further comprises an audio power amplification module which is electrically connected with the audio output end 2 for driving the load output.
The invention combines the resistor and the capacitor on the negative feedback circuit formed by the triode Q1 and the triode Q2 to ensure that the gain of the circuit has frequency characteristic, and all circuit devices are resistor, capacitor, MOS tube, triode and other separating devices, and the invention has no integrated circuit and operational amplifier, low cost and great market competitiveness.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, as long as the technical solutions for achieving the objects of the present invention by substantially the same means are all within the scope of the present invention.
Claims (1)
1. An audio gain circuit, comprising:
an audio input (1) for inputting an audio signal;
the low-frequency gain module is electrically connected with the audio input end (1) and used for enhancing a low-frequency part of the audio signal;
the high-frequency gain module is electrically connected with the audio input end (1) and used for enhancing a high-frequency part of the audio signal;
the audio output end (2) is respectively and electrically connected with the low-frequency gain module and the high-frequency gain module and is used for outputting the audio signals subjected to gain processing;
the low-frequency gain module comprises a triode Q1, a triode Q2, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C3, wherein the base electrode of the triode Q1 is electrically connected with the audio input end (1), the collector electrode of the triode Q1 is electrically connected with the base electrode of the triode Q2, the emitter electrode of the triode Q1 is electrically connected with the resistor R6 and the resistor R7 in sequence, the emitter electrode of the triode Q1 is also electrically connected with the resistor R4, the resistor R5, the collector electrode of the triode Q2 and the audio output end (2) in sequence, and the capacitor C3 is connected with the resistor R4 in parallel;
the first switch module (3), the first switch module (3) includes MOS tube Q4 and first control signal input end (31), the source electrode of the MOS tube Q4 is electrically connected with one end of the electric capacity C3, the drain electrode of the MOS tube Q4 is electrically connected with another end of the electric capacity C3, the grid electrode of the MOS tube Q4 is electrically connected with the first control signal input end (31);
the high-frequency gain module comprises a triode Q12, a triode Q22, a resistor R42, a resistor R52, a resistor R62, a resistor R72 and a capacitor C4, wherein the base electrode of the triode Q12 is electrically connected with the audio input end (1), the collector electrode of the triode Q12 is electrically connected with the base electrode of the triode Q22, the emitter electrode of the triode Q12 is electrically connected with the resistor R62 and the resistor R72 in sequence, the emitter electrode of the triode Q12 is also electrically connected with the resistor R42, the resistor R52, the collector electrode of the triode Q22 and the audio output end (2) in sequence, and the capacitor C4 is connected with the resistor R72 in parallel;
the second switch module (4), the said second switch module (4) includes MOS tube Q3 and second control signal input end (41), the drain electrode of the MOS tube Q3 is electrically connected with one end of the electric capacity C4, the source electrode of the MOS tube Q3 is electrically connected with one end of the resistance R72, the grid electrode of the MOS tube Q3 is electrically connected with second control signal input end (41);
the audio power amplification module is electrically connected with the audio output end (2) and used for driving load output.
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 CN107396242A (en) | 2017-11-24 |
| CN107396242B true CN107396242B (en) | 2024-02-06 |
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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 |
Also Published As
| Publication number | Publication date |
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| CN107396242A (en) | 2017-11-24 |
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