CN104464748A - Filter-frequency-adjustable audio processing system based on linear driving - Google Patents
Filter-frequency-adjustable audio processing system based on linear driving Download PDFInfo
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- CN104464748A CN104464748A CN201410715320.5A CN201410715320A CN104464748A CN 104464748 A CN104464748 A CN 104464748A CN 201410715320 A CN201410715320 A CN 201410715320A CN 104464748 A CN104464748 A CN 104464748A
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Abstract
The invention discloses a filter-frequency-adjustable audio processing system based on linear driving. The system is mainly composed of an audio acquisition module, a frequency selecting circuit, a microprocessing circuit, an amplifying circuit and an adjustable filter circuit, wherein the frequency selecting circuit is connected with the audio acquisition module, the microprocessing circuit is connected with the frequency selecting circuit, and the amplifying circuit and the adjustable filter circuit are both connected with the microprocessing circuit. The system is characterized in that a linear driving circuit is further arranged between the microprocessing circuit and the frequency selecting circuit; the linear driving circuit is composed of a driving chip U, a triode VT4, a triode VT5, a triode VT6, a triode VT7 and the like. The linear driving circuit can make the audio processing system more stable.
Description
Technical field
The present invention relates to a kind of electronic system, specifically refer to the adjustable frequency filtering audio frequency processing system based on Linear Driving.
Background technology
Along with people pursue more and more higher to quality of life, present home theater enters into every household substantially, brings very large enjoyment to people's life.But, often there will be noise when people watch film, thus have influence on film play quality.
Summary of the invention
The object of the invention is to overcome the bad defect of current audio disposal system filter effect, the adjustable frequency filtering audio frequency processing system based on Linear Driving is provided.
The following technical scheme of object of the present invention realizes: based on the adjustable frequency filtering audio frequency processing system of Linear Driving, primarily of audio collection module, the frequency selection circuit be connected with audio collection module, the micro-processor interface circuit be connected with frequency selection circuit, the amplifying circuit be all connected with micro-processor interface circuit and tunable filter circuit form, between micro-processor interface circuit and frequency selection circuit, be also provided with linear drive circuit, described linear drive circuit is by driving chip U, triode VT4, triode VT5, triode VT6, triode VT7, positive pole is connected with frequency selection circuit, the polar capacitor C12 that negative pole is connected with the IN1 pin of driving chip U after resistance R15, one end is connected with the collector of triode VT4, the resistance R16 that the other end is connected with the base stage of triode VT6 after resistance R17, positive pole is connected with the base stage of triode VT4, the polar capacitor C14 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the polar capacitor C13 of minus earth, one end is connected with the emitter of triode VT4, the resistance R19 that the other end is connected with the base stage of triode VT5, one end is connected with the base stage of triode VT5, the resistance R18 that the other end is connected with the base stage of triode VT6, N pole is connected with the collector of triode VT4, the diode D1 that P pole is connected with the collector of triode VT5, positive terminal is connected with the collector of triode VT4, the not gate K that end of oppisite phase is connected with triode VT7 collector, one end is connected with triode VT7 emitter, the resistance R21 that the other end is connected with the emitter of triode VT6 after resistance R20, the end of oppisite phase of P pole Sheffer stroke gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R21 with resistance R20 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT4, END pin ground connection, OUT pin are connected with the collector of triode VT5, the collector of triode VT5 is also connected with the base stage of triode VT7, its emitter is connected with the base stage of triode VT6, the grounded collector of triode VT6, the N pole of diode D2 is connected with micro-processor interface circuit.
Described frequency selection circuit is by polar capacitor C1, and polar capacitor C2, polar capacitor C3, polar capacitor C4, resistance R1, resistance R2 form; The positive pole of polar capacitor C1 is connected with its negative pole in turn after resistance R1, polar capacitor C3, polar capacitor C4, resistance R2, polar capacitor C2, polar capacitor C1 is connected with an output terminal of audio collection module with the tie point of resistance R1, polar capacitor C2 is connected with another output terminal of audio collection module with the tie point of resistance R2, resistance R1 is connected with the positive pole of electric capacity C12 with the tie point of polar capacitor C3, and resistance R2 is connected with micro-processor interface circuit with the tie point of polar capacitor C4.
Described micro-processor interface circuit is by triode VT1, triode VT2, the resistance R3 that one end is connected with the collector of triode VT2, the other end is connected with the base stage of triode VT1, the polar capacitor C5 that positive pole is connected with the base stage of triode VT1, negative pole is connected with the emitter of triode VT1, and the resistance R4 that one end is connected with the base stage of triode VT2, the other end is connected with the collector of triode VT1 forms; The collector of described triode VT2 is connected with the positive pole of electric capacity C12, its emitter is connected with tunable filter circuit, and the emitter of triode VT1 is connected with the tie point of electric capacity C4 with amplifying circuit and resistance R2 simultaneously, base stage is connected with the N pole of diode D2.
Described amplifying circuit is by operational amplifier T3, positive pole is connected with the normal phase input end of operational amplifier T3 after resistance R7, the negative pole then polar capacitor C7 of ground connection after resistance R5, the polar capacitor C6 that positive pole is connected with the emitter of triode VT1, negative pole is connected with the negative pole of polar capacitor C7, the resistance R6 that one end is connected with the positive pole of polar capacitor C7, the other end is connected with the inverting input of operational amplifier T3 after resistance R8, and the resistance R9 be serially connected between the inverting input of operational amplifier T3 and output terminal forms; The tie point ground connection of resistance R6 and resistance R8.
Described tunable filter circuit is by operational amplifier T1, operational amplifier T2, triode VT3, positive pole is connected with the emitter of triode VT2, the polar capacitor C8 that negative pole is connected with the output terminal of operational amplifier T1 after potentiometer R12 through resistance R11, positive pole is connected with the normal phase input end of operational amplifier T1, the polar capacitor C10 that negative pole is connected with the collector of triode VT3, negative pole is connected with the output terminal of operational amplifier T1, the polar capacitor C9 that positive pole is connected with the positive pole of polar capacitor C8 after resistance R10, positive pole is connected with the emitter of triode VT3, the polar capacitor C11 that negative pole enters to be connected with the anti-phase defeated end of amplifier T2, one end is connected with the positive pole of polar capacitor C11, the resistance R13 that the other end is then connected with the inverting input of operational amplifier T2 after potentiometer R14 forms, the inverting input of institute operational amplifier T1 is connected with the normal phase input end of operational amplifier T2, and the base stage of triode VT3 is connected with the negative pole of polar capacitor C8, its emitter is also connected with the positive pole of polar capacitor C9.
Described driving chip U is LM387 integrated chip.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention is provided with tunable filter circuit, and it can filter out unwanted ripple frequently, avoids audio frequency processing system to be subject to not needing ripple interference frequently, thus improves film play quality.
(2) as long as the present invention's adjustment potentiometer R12 and potentiometer R14, then can adjust the frequency filtering of audio frequency processing system, thus better can filter out noise.
(3) linear drive circuit of the present invention can make audio frequency processing system more stabilize calmly.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is the structural representation of linear drive circuit of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, adjustable frequency filtering audio frequency processing system based on Linear Driving of the present invention, primarily of audio collection module, the frequency selection circuit be connected with audio collection module, the micro-processor interface circuit be connected with frequency selection circuit, the amplifying circuit be all connected with micro-processor interface circuit and tunable filter circuit form, between micro-processor interface circuit and frequency selection circuit, be also provided with linear drive circuit.
As shown in Figure 2, described linear drive circuit is by driving chip U, triode VT4, triode VT5, triode VT6, triode VT7, positive pole is connected with frequency selection circuit, the polar capacitor C12 that negative pole is connected with the IN1 pin of driving chip U after resistance R15, one end is connected with the collector of triode VT4, the resistance R16 that the other end is connected with the base stage of triode VT6 after resistance R17, positive pole is connected with the base stage of triode VT4, the polar capacitor C14 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the polar capacitor C13 of minus earth, one end is connected with the emitter of triode VT4, the resistance R19 that the other end is connected with the base stage of triode VT5, one end is connected with the base stage of triode VT5, the resistance R18 that the other end is connected with the base stage of triode VT6, N pole is connected with the collector of triode VT4, the diode D1 that P pole is connected with the collector of triode VT5, positive terminal is connected with the collector of triode VT4, the not gate K that end of oppisite phase is connected with triode VT7 collector, one end is connected with triode VT7 emitter, the resistance R21 that the other end is connected with the emitter of triode VT6 after resistance R20, the end of oppisite phase of P pole Sheffer stroke gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R21 with resistance R20 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT4, END pin ground connection, OUT pin are connected with the collector of triode VT5, the collector of triode VT5 is also connected with the base stage of triode VT7, its emitter is connected with the base stage of triode VT6, the grounded collector of triode VT6, the N pole of diode D2 is connected with micro-processor interface circuit.It is fixed that linear drive circuit can make audio frequency processing system more stabilize.In order to ensure implementation result, described driving chip U is preferably LM387 integrated chip, its highly sensitive and low price.
Described frequency selection circuit is by polar capacitor C1, and polar capacitor C2, polar capacitor C3, polar capacitor C4, resistance R1, resistance R2 form; The positive pole of polar capacitor C1 is connected with its negative pole in turn after resistance R1, polar capacitor C3, polar capacitor C4, resistance R2, polar capacitor C2, polar capacitor C1 is connected with an output terminal of audio collection module with the tie point of resistance R1, polar capacitor C2 is connected with another output terminal of audio collection module with the tie point of resistance R2, resistance R1 is connected with the positive pole of electric capacity C12 with the tie point of polar capacitor C3, and resistance R2 is connected with micro-processor interface circuit with the tie point of polar capacitor C4.
Described micro-processor interface circuit is by triode VT1, triode VT2, the resistance R3 that one end is connected with the collector of triode VT2, the other end is connected with the base stage of triode VT1, the polar capacitor C5 that positive pole is connected with the base stage of triode VT1, negative pole is connected with the emitter of triode VT1, and the resistance R4 that one end is connected with the base stage of triode VT2, the other end is connected with the collector of triode VT1 forms; The collector of described triode VT2 is connected with the positive pole of electric capacity C12, its emitter is connected with tunable filter circuit, and the emitter of triode VT1 is connected with the tie point of electric capacity C4 with amplifying circuit and resistance R2 simultaneously, base stage is connected with the N pole of diode D2.
Described amplifying circuit is by operational amplifier T3, positive pole is connected with the normal phase input end of operational amplifier T3 after resistance R7, the negative pole then polar capacitor C7 of ground connection after resistance R5, the polar capacitor C6 that positive pole is connected with the emitter of triode VT1, negative pole is connected with the negative pole of polar capacitor C7, the resistance R6 that one end is connected with the positive pole of polar capacitor C7, the other end is connected with the inverting input of operational amplifier T3 after resistance R8, and the resistance R9 be serially connected between the inverting input of operational amplifier T3 and output terminal forms; The tie point ground connection of resistance R6 and resistance R8.
Described tunable filter circuit is by operational amplifier T1, operational amplifier T2, triode VT3, positive pole is connected with the emitter of triode VT2, the polar capacitor C8 that negative pole is connected with the output terminal of operational amplifier T1 after potentiometer R12 through resistance R11, positive pole is connected with the normal phase input end of operational amplifier T1, the polar capacitor C10 that negative pole is connected with the collector of triode VT3, negative pole is connected with the output terminal of operational amplifier T1, the polar capacitor C9 that positive pole is connected with the positive pole of polar capacitor C8 after resistance R10, positive pole is connected with the emitter of triode VT3, the polar capacitor C11 that negative pole enters to be connected with the anti-phase defeated end of amplifier T2, one end is connected with the positive pole of polar capacitor C11, the resistance R13 that the other end is then connected with the inverting input of operational amplifier T2 after potentiometer R14 forms, the inverting input of institute operational amplifier T1 is connected with the normal phase input end of operational amplifier T2, and the base stage of triode VT3 is connected with the negative pole of polar capacitor C8, its emitter is also connected with the positive pole of polar capacitor C9.
As mentioned above, just well the present invention can be realized.
Claims (6)
1. based on the adjustable frequency filtering audio frequency processing system of Linear Driving, primarily of audio collection module, the frequency selection circuit be connected with audio collection module, the micro-processor interface circuit be connected with frequency selection circuit, the amplifying circuit be all connected with micro-processor interface circuit and tunable filter circuit form, and it is characterized in that: between micro-processor interface circuit and frequency selection circuit, be also provided with linear drive circuit, described linear drive circuit is by driving chip U, triode VT4, triode VT5, triode VT6, triode VT7, positive pole is connected with frequency selection circuit, the polar capacitor C12 that negative pole is connected with the IN1 pin of driving chip U after resistance R15, one end is connected with the collector of triode VT4, the resistance R16 that the other end is connected with the base stage of triode VT6 after resistance R17, positive pole is connected with the base stage of triode VT4, the polar capacitor C14 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the polar capacitor C13 of minus earth, one end is connected with the emitter of triode VT4, the resistance R19 that the other end is connected with the base stage of triode VT5, one end is connected with the base stage of triode VT5, the resistance R18 that the other end is connected with the base stage of triode VT6, N pole is connected with the collector of triode VT4, the diode D1 that P pole is connected with the collector of triode VT5, positive terminal is connected with the collector of triode VT4, the not gate K that end of oppisite phase is connected with triode VT7 collector, one end is connected with triode VT7 emitter, the resistance R21 that the other end is connected with the emitter of triode VT6 after resistance R20, the end of oppisite phase of P pole Sheffer stroke gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R21 with resistance R20 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT4, END pin ground connection, OUT pin are connected with the collector of triode VT5, the collector of triode VT5 is also connected with the base stage of triode VT7, its emitter is connected with the base stage of triode VT6, the grounded collector of triode VT6, the N pole of diode D2 is connected with micro-processor interface circuit.
2. the adjustable frequency filtering audio frequency processing system based on Linear Driving according to claim 1, is characterized in that: described frequency selection circuit is by polar capacitor C1, and polar capacitor C2, polar capacitor C3, polar capacitor C4, resistance R1, resistance R2 form; The positive pole of polar capacitor C1 is connected with its negative pole in turn after resistance R1, polar capacitor C3, polar capacitor C4, resistance R2, polar capacitor C2, polar capacitor C1 is connected with an output terminal of audio collection module with the tie point of resistance R1, polar capacitor C2 is connected with another output terminal of audio collection module with the tie point of resistance R2, resistance R1 is connected with the positive pole of electric capacity C12 with the tie point of polar capacitor C3, and resistance R2 is connected with micro-processor interface circuit with the tie point of polar capacitor C4.
3. the adjustable frequency filtering audio frequency processing system based on Linear Driving according to claim 2, it is characterized in that: described micro-processor interface circuit is by triode VT1, triode VT2, the resistance R3 that one end is connected with the collector of triode VT2, the other end is connected with the base stage of triode VT1, the polar capacitor C5 that positive pole is connected with the base stage of triode VT1, negative pole is connected with the emitter of triode VT1, and the resistance R4 that one end is connected with the base stage of triode VT2, the other end is connected with the collector of triode VT1 forms; The collector of described triode VT2 is connected with the positive pole of electric capacity C12, its emitter is connected with tunable filter circuit, and the emitter of triode VT1 is connected with the tie point of electric capacity C4 with amplifying circuit and resistance R2 simultaneously, base stage is connected with the N pole of diode D2.
4. the adjustable frequency filtering audio frequency processing system based on Linear Driving according to claim 3, it is characterized in that: described amplifying circuit is by operational amplifier T3, positive pole is connected with the normal phase input end of operational amplifier T3 after resistance R7, negative pole is the polar capacitor C7 of ground connection after resistance R5 then, positive pole is connected with the emitter of triode VT1, the polar capacitor C6 that negative pole is connected with the negative pole of polar capacitor C7, one end is connected with the positive pole of polar capacitor C7, the resistance R6 that the other end is connected with the inverting input of operational amplifier T3 after resistance R8, and the resistance R9 be serially connected between the inverting input of operational amplifier T3 and output terminal forms, the tie point ground connection of resistance R6 and resistance R8.
5. the adjustable frequency filtering audio frequency processing system based on Linear Driving according to claim 4, it is characterized in that: described tunable filter circuit is by operational amplifier T1, operational amplifier T2, triode VT3, positive pole is connected with the emitter of triode VT2, the polar capacitor C8 that negative pole is connected with the output terminal of operational amplifier T1 after potentiometer R12 through resistance R11, positive pole is connected with the normal phase input end of operational amplifier T1, the polar capacitor C10 that negative pole is connected with the collector of triode VT3, negative pole is connected with the output terminal of operational amplifier T1, the polar capacitor C9 that positive pole is connected with the positive pole of polar capacitor C8 after resistance R10, positive pole is connected with the emitter of triode VT3, the polar capacitor C11 that negative pole enters to be connected with the anti-phase defeated end of amplifier T2, one end is connected with the positive pole of polar capacitor C11, the resistance R13 that the other end is then connected with the inverting input of operational amplifier T2 after potentiometer R14 forms, the inverting input of institute operational amplifier T1 is connected with the normal phase input end of operational amplifier T2, and the base stage of triode VT3 is connected with the negative pole of polar capacitor C8, its emitter is also connected with the positive pole of polar capacitor C9.
6. the adjustable frequency filtering audio frequency processing system based on Linear Driving according to any one of Claims 1 to 5, is characterized in that: described driving chip U is LM387 integrated chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715320.5A CN104464748A (en) | 2014-11-29 | 2014-11-29 | Filter-frequency-adjustable audio processing system based on linear driving |
| CN201510321295.7A CN104954946A (en) | 2014-11-29 | 2015-06-12 | Adjustable filtering frequency audio processing system based on buck-mode constant current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715320.5A CN104464748A (en) | 2014-11-29 | 2014-11-29 | Filter-frequency-adjustable audio processing system based on linear driving |
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| CN104464748A true CN104464748A (en) | 2015-03-25 |
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| CN201410715320.5A Pending CN104464748A (en) | 2014-11-29 | 2014-11-29 | Filter-frequency-adjustable audio processing system based on linear driving |
| CN201510321295.7A Withdrawn CN104954946A (en) | 2014-11-29 | 2015-06-12 | Adjustable filtering frequency audio processing system based on buck-mode constant current |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510321295.7A Withdrawn CN104954946A (en) | 2014-11-29 | 2015-06-12 | Adjustable filtering frequency audio processing system based on buck-mode constant current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104835496A (en) * | 2015-05-30 | 2015-08-12 | 宁波摩米创新工场电子科技有限公司 | High-definition voice recognition system based on linear driving |
| CN105139868A (en) * | 2015-07-28 | 2015-12-09 | 苏州宏展信息科技有限公司 | speech frequency automatic compensation control method for recording pen |
-
2014
- 2014-11-29 CN CN201410715320.5A patent/CN104464748A/en active Pending
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2015
- 2015-06-12 CN CN201510321295.7A patent/CN104954946A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104835496A (en) * | 2015-05-30 | 2015-08-12 | 宁波摩米创新工场电子科技有限公司 | High-definition voice recognition system based on linear driving |
| CN105139868A (en) * | 2015-07-28 | 2015-12-09 | 苏州宏展信息科技有限公司 | speech frequency automatic compensation control method for recording pen |
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| Publication number | Publication date |
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| CN104954946A (en) | 2015-09-30 |
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Application publication date: 20150325 |