CN104469613A - Low-pass filtering and amplifying audio processing system based on linear driving - Google Patents
Low-pass filtering and amplifying audio processing system based on linear driving Download PDFInfo
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- CN104469613A CN104469613A CN201410715449.6A CN201410715449A CN104469613A CN 104469613 A CN104469613 A CN 104469613A CN 201410715449 A CN201410715449 A CN 201410715449A CN 104469613 A CN104469613 A CN 104469613A
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Abstract
The invention discloses a low-pass filtering and amplifying audio processing system based on linear driving. The system is characterized by being composed of an audio acquisition module, a frequency selecting circuit, a linear driving circuit, a current source circuit, a microprocessing circuit and a two-stage low-pass filtering and amplifying circuit, wherein the frequency selecting circuit is connected with the audio acquisition module, the linear driving circuit and the current source circuit are both connected with the frequency selecting circuit, the microprocessing circuit is connected with the linear driving circuit and the current source circuit simultaneously, and the two-stage low-pass filtering and amplifying circuit is connected with the current source circuit; the linear driving circuit is composed of a driving chip U, a triode VT7, a triode VT8, a triode VT9, a triode VT10, a polar capacitor C12, a resistor R15 and the like; the positive electrode of the polar capacitor C12 is connected with the frequency selecting circuit, and the negative electrode of the polar capacitor C12 is connected with a pin IN1 of the driving chip U after passing through a resistor R14; one end of the resistor R15 is connected with the collector electrode of the triode VT7, and the other end of the resistor R15 is connected with the base electrode of the triode VT9 after passing through a resistor R16. Since the low-pass filtering and amplifying audio processing system based on linear driving is provided with the linear driving circuit, audio signals can be amplified by the system in an undistorted mode, the sound effect can be better, and the film playing quality can be improved.
Description
Technical field
The present invention relates to a kind of electronic system, specifically refer to that a kind of low-pass filtering based on Linear Driving amplifies audio frequency processing system.
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 the unclear situation of sound when people watch film, thus have influence on film play quality.
Summary of the invention
The object of the invention is to overcome the defect that current audio treatment system is easily directed at the audio distortion after process, provide a kind of low-pass filtering based on Linear Driving can stablizing processing audio to amplify audio frequency processing system.
The following technical scheme of object of the present invention realizes: the low-pass filtering based on Linear Driving amplifies audio frequency processing system, by audio collection module, the frequency selection circuit be connected with audio collection module, the linear drive circuit be all connected with frequency selection circuit and current source circuit, the micro-processor interface circuit be simultaneously connected with current source circuit with linear drive circuit, and the two-stage low-pass filtering amplifying circuit be connected with current source circuit forms, described linear drive circuit is by driving chip U, triode VT7, triode VT8, triode VT9, triode VT10, 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 R14, one end is connected with the collector electrode of triode VT7, the resistance R15 that the other end is connected with the base stage of triode VT9 after resistance R16, positive pole is connected with the base stage of triode VT7, 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 VT7, the resistance R18 that the other end is connected with the base stage of triode VT8, one end is connected with the base stage of triode VT8, the resistance R17 that the other end is connected with the base stage of triode VT9, N pole is connected with the collector electrode of triode VT7, the diode D3 that P pole is connected with the collector electrode of triode VT8, positive terminal is connected with the collector electrode of triode VT7, the not gate K that end of oppisite phase is connected with triode VT10 collector electrode, one end is connected with triode VT10 emitter, the resistance R20 that the other end is connected with the emitter of triode VT9 after resistance R19, the end of oppisite phase of P pole NAND gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R20 with resistance R19 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT7, END pin ground connection, OUT pin are connected with the collector electrode of triode VT8, the collector electrode of triode VT8 is also connected with the base stage of triode VT10, its emitter is connected with the base stage of triode man VT9, the grounded collector of triode VT9, the N pole of diode D2 is connected with micro-processor interface circuit.
Described frequency selection circuit is by triode VT1, triode VT2, positive pole is connected with the base stage of triode VT1 after resistance R1, negative pole then through the polar capacitor C1 that polar capacitor C2 is connected with the base stage of triode VT1 after polar capacitor C3, and the resistance R2 that one end is connected with the base stage of triode VT2, the other end is then connected with the collector electrode of triode VT1 forms; The collector electrode of described triode VT2 is simultaneously with the positive pole of polar capacitor C1 and an output of audio collection module is connected, its emitter is then connected with current source circuit, and the emitter of triode VT1 is then connected with the tie point of polar capacitor C3 another output with the positive pole of electric capacity C12 and audio collection module with polar capacitor C2 simultaneously.
Described micro-processor interface circuit comprises polar capacitor C4, polar capacitor C5, resistance R6, and field effect transistor Q1; The positive pole of polar capacitor C4 is connected with the N pole of diode D2, its negative pole is connected with the grid of field effect transistor Q1, one end of resistance R6 is connected with the grid of field effect transistor Q1, other end ground connection, the negative pole of polar capacitor C5 is connected with the drain electrode of field effect transistor Q1, positive pole is then connected with current source circuit and two-stage low-pass filtering amplifying circuit simultaneously, and the source electrode of described field effect transistor Q1 is connected with current source circuit.
Described current source circuit is by triode VT3, triode VT4, the voltage stabilizing didoe D1 that N pole is connected with the base stage of triode VT3, P pole is connected with the emitter of triode VT3 after resistance R4, one end is connected with the base stage of triode VT3, the resistance R3 of other end ground connection, and the resistance R5 that one end is connected with triode VT4 emitter, the other end is connected with the positive pole of polar capacitor C5 forms; The described collector electrode of triode VT3 is connected with the source electrode of field effect transistor Q1, emitter is connected with the base stage of triode VT4, the grounded collector of triode VT4, and the P pole of voltage stabilizing didoe D1 is connected with external power source.
Described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with the positive pole of electric capacity C5, the polar capacitor C6 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R7 that the other end is connected with the P pole of diode D1, positive pole is connected with amplifier P1 inverting input after resistance R8, the polar capacitor C7 that negative pole is connected with the negative pole of polar capacitor C6, be serially connected in the polar capacitor C8 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the polar capacitor C9 that positive pole is connected with the base stage of triode VT5, one end is connected with the collector electrode of triode VT5, the resistance R9 that the other end is connected with the emitter of triode VT6, positive pole is connected with the base stage of triode VT6 after resistance R10, the polar capacitor C10 of ground connection while negative pole is connected with amplifier P1 output, one end is connected with the positive pole of polar capacitor C10, the resistance R11 that the other end is connected with the inverting input of amplifier P2, the resistance R12 be in parallel with resistance R11, be serially connected in the polar capacitor C11 between the output of amplifier P2 and inverting input, and the resistance R13 be serially connected between the normal phase input end of amplifier P2 and output forms, the emitter of described triode VT5 is connected with polar capacitor C10 negative pole, and the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2.
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 linear drive circuit, and it distortionlessly can amplify audio signal, makes sound effect better improve film play quality.
(2) structure of the present invention is simple, and energy efficient.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the overall structure schematic diagram 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, low-pass filtering based on Linear Driving of the present invention amplifies audio frequency processing system, by audio collection module, the frequency selection circuit be connected with audio collection module, the linear drive circuit be all connected with frequency selection circuit and current source circuit, the micro-processor interface circuit be simultaneously connected with current source circuit with linear drive circuit, and the two-stage low-pass filtering amplifying circuit be connected with current source circuit forms.
As shown in Figure 2, described linear drive circuit is by driving chip U, triode VT7, triode VT8, triode VT9, triode VT10, 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 R14, one end is connected with the collector electrode of triode VT7, the resistance R15 that the other end is connected with the base stage of triode VT9 after resistance R16, positive pole is connected with the base stage of triode VT7, 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 VT7, the resistance R18 that the other end is connected with the base stage of triode VT8, one end is connected with the base stage of triode VT8, the resistance R17 that the other end is connected with the base stage of triode VT9, N pole is connected with the collector electrode of triode VT7, the diode D3 that P pole is connected with the collector electrode of triode VT8, positive terminal is connected with the collector electrode of triode VT7, the not gate K that end of oppisite phase is connected with triode VT10 collector electrode, one end is connected with triode VT10 emitter, the resistance R20 that the other end is connected with the emitter of triode VT9 after resistance R19, the end of oppisite phase of P pole NAND gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R20 with resistance R19 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT7, END pin ground connection, OUT pin are connected with the collector electrode of triode VT8, the collector electrode of triode VT8 is also connected with the base stage of triode VT10, its emitter is connected with the base stage of triode man VT9, the grounded collector of triode VT9, the N pole of diode D2 is connected with micro-processor interface circuit.Property drive circuit, it distortionlessly can amplify audio signal, makes sound effect better improve film play quality.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 triode VT1, triode VT2, positive pole is connected with the base stage of triode VT1 after resistance R1, negative pole then through the polar capacitor C1 that polar capacitor C2 is connected with the base stage of triode VT1 after polar capacitor C3, and the resistance R2 that one end is connected with the base stage of triode VT2, the other end is then connected with the collector electrode of triode VT1 forms; The collector electrode of described triode VT2 is simultaneously with the positive pole of polar capacitor C1 and an output of audio collection module is connected, its emitter is then connected with current source circuit, and the emitter of triode VT1 is then connected with the tie point of polar capacitor C3 another output with the positive pole of electric capacity C12 and audio collection module with polar capacitor C2 simultaneously.
Described micro-processor interface circuit comprises polar capacitor C4, polar capacitor C5, resistance R6, and field effect transistor Q1; The positive pole of polar capacitor C4 is connected with the N pole of diode D2, its negative pole is connected with the grid of field effect transistor Q1, one end of resistance R6 is connected with the grid of field effect transistor Q1, other end ground connection, the negative pole of polar capacitor C5 is connected with the drain electrode of field effect transistor Q1, positive pole is then connected with current source circuit and two-stage low-pass filtering amplifying circuit simultaneously, and the source electrode of described field effect transistor Q1 is connected with current source circuit.
Described current source circuit is by triode VT3, triode VT4, the voltage stabilizing didoe D1 that N pole is connected with the base stage of triode VT3, P pole is connected with the emitter of triode VT3 after resistance R4, one end is connected with the base stage of triode VT3, the resistance R3 of other end ground connection, and the resistance R5 that one end is connected with triode VT4 emitter, the other end is connected with the positive pole of polar capacitor C5 forms; The described collector electrode of triode VT3 is connected with the source electrode of field effect transistor Q1, emitter is connected with the base stage of triode VT4, the grounded collector of triode VT4, and the P pole of voltage stabilizing didoe D1 is connected with external power source.
Described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with the positive pole of electric capacity C5, the polar capacitor C6 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R7 that the other end is connected with the P pole of diode D1, positive pole is connected with amplifier P1 inverting input after resistance R8, the polar capacitor C7 that negative pole is connected with the negative pole of polar capacitor C6, be serially connected in the polar capacitor C8 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the polar capacitor C9 that positive pole is connected with the base stage of triode VT5, one end is connected with the collector electrode of triode VT5, the resistance R9 that the other end is connected with the emitter of triode VT6, positive pole is connected with the base stage of triode VT6 after resistance R10, the polar capacitor C10 of ground connection while negative pole is connected with amplifier P1 output, one end is connected with the positive pole of polar capacitor C10, the resistance R11 that the other end is connected with the inverting input of amplifier P2, the resistance R12 be in parallel with resistance R11, be serially connected in the polar capacitor C11 between the output of amplifier P2 and inverting input, and the resistance R13 be serially connected between the normal phase input end of amplifier P2 and output forms, the emitter of described triode VT5 is connected with polar capacitor C10 negative pole, and the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2.
As mentioned above, just well the present invention can be realized.
Claims (6)
1. the low-pass filtering based on Linear Driving amplifies audio frequency processing system, it is characterized in that: by audio collection module, the frequency selection circuit be connected with audio collection module, the linear drive circuit be all connected with frequency selection circuit and current source circuit, the micro-processor interface circuit be simultaneously connected with current source circuit with linear drive circuit, and the two-stage low-pass filtering amplifying circuit be connected with current source circuit forms, described linear drive circuit is by driving chip U, triode VT7, triode VT8, triode VT9, triode VT10, 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 R14, one end is connected with the collector electrode of triode VT7, the resistance R15 that the other end is connected with the base stage of triode VT9 after resistance R16, positive pole is connected with the base stage of triode VT7, 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 VT7, the resistance R18 that the other end is connected with the base stage of triode VT8, one end is connected with the base stage of triode VT8, the resistance R17 that the other end is connected with the base stage of triode VT9, N pole is connected with the collector electrode of triode VT7, the diode D3 that P pole is connected with the collector electrode of triode VT8, positive terminal is connected with the collector electrode of triode VT7, the not gate K that end of oppisite phase is connected with triode VT10 collector electrode, one end is connected with triode VT10 emitter, the resistance R20 that the other end is connected with the emitter of triode VT9 after resistance R19, the end of oppisite phase of P pole NAND gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R20 with resistance R19 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT7, END pin ground connection, OUT pin are connected with the collector electrode of triode VT8, the collector electrode of triode VT8 is also connected with the base stage of triode VT10, its emitter is connected with the base stage of triode man VT9, the grounded collector of triode VT9, the N pole of diode D2 is connected with micro-processor interface circuit.
2. the low-pass filtering based on Linear Driving according to claim 1 amplifies audio frequency processing system, it is characterized in that: described frequency selection circuit is by triode VT1, triode VT2, positive pole is connected with the base stage of triode VT1 after resistance R1, negative pole then through the polar capacitor C1 that polar capacitor C2 is connected with the base stage of triode VT1 after polar capacitor C3, and the resistance R2 that one end is connected with the base stage of triode VT2, the other end is then connected with the collector electrode of triode VT1 forms; The collector electrode of described triode VT2 is simultaneously with the positive pole of polar capacitor C1 and an output of audio collection module is connected, its emitter is then connected with current source circuit, and the emitter of triode VT1 is then connected with the tie point of polar capacitor C3 another output with the positive pole of electric capacity C12 and audio collection module with polar capacitor C2 simultaneously.
3. the low-pass filtering based on Linear Driving according to claim 2 amplifies audio frequency processing system, it is characterized in that: described micro-processor interface circuit comprises polar capacitor C4, polar capacitor C5, resistance R6, and field effect transistor Q1; The positive pole of polar capacitor C4 is connected with the N pole of diode D2, its negative pole is connected with the grid of field effect transistor Q1, one end of resistance R6 is connected with the grid of field effect transistor Q1, other end ground connection, the negative pole of polar capacitor C5 is connected with the drain electrode of field effect transistor Q1, positive pole is then connected with current source circuit and two-stage low-pass filtering amplifying circuit simultaneously, and the source electrode of described field effect transistor Q1 is connected with current source circuit.
4. the low-pass filtering based on Linear Driving according to claim 3 amplifies audio frequency processing system, it is characterized in that: described current source circuit is by triode VT3, triode VT4, the voltage stabilizing didoe D1 that N pole is connected with the base stage of triode VT3, P pole is connected with the emitter of triode VT3 after resistance R4, one end is connected with the base stage of triode VT3, the resistance R3 of other end ground connection, and the resistance R5 that one end is connected with triode VT4 emitter, the other end is connected with the positive pole of polar capacitor C5 forms; The described collector electrode of triode VT3 is connected with the source electrode of field effect transistor Q1, emitter is connected with the base stage of triode VT4, the grounded collector of triode VT4, and the P pole of voltage stabilizing didoe D1 is connected with external power source.
5. the low-pass filtering based on Linear Driving according to claim 4 amplifies audio frequency processing system, it is characterized in that: described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with the positive pole of electric capacity C5, the polar capacitor C6 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R7 that the other end is connected with the P pole of diode D1, positive pole is connected with amplifier P1 inverting input after resistance R8, the polar capacitor C7 that negative pole is connected with the negative pole of polar capacitor C6, be serially connected in the polar capacitor C8 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the polar capacitor C9 that positive pole is connected with the base stage of triode VT5, one end is connected with the collector electrode of triode VT5, the resistance R9 that the other end is connected with the emitter of triode VT6, positive pole is connected with the base stage of triode VT6 after resistance R10, the polar capacitor C10 of ground connection while negative pole is connected with amplifier P1 output, one end is connected with the positive pole of polar capacitor C10, the resistance R11 that the other end is connected with the inverting input of amplifier P2, the resistance R12 be in parallel with resistance R11, be serially connected in the polar capacitor C11 between the output of amplifier P2 and inverting input, and the resistance R13 be serially connected between the normal phase input end of amplifier P2 and output forms, the emitter of described triode VT5 is connected with polar capacitor C10 negative pole, and the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2.
6. the low-pass filtering based on Linear Driving according to any one of Claims 1 to 5 amplifies audio frequency processing system, it is characterized in that: described driving chip U is LM387 integrated chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715449.6A CN104469613A (en) | 2014-11-29 | 2014-11-29 | Low-pass filtering and amplifying audio processing system based on linear driving |
| CN201510323511.1A CN104967947A (en) | 2014-11-29 | 2015-06-12 | Low-pass filtering amplification audio processing system based on step-down constant current circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715449.6A CN104469613A (en) | 2014-11-29 | 2014-11-29 | Low-pass filtering and amplifying audio processing system based on linear driving |
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| CN104469613A true CN104469613A (en) | 2015-03-25 |
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| CN201410715449.6A Pending CN104469613A (en) | 2014-11-29 | 2014-11-29 | Low-pass filtering and amplifying audio processing system based on linear driving |
| CN201510323511.1A Withdrawn CN104967947A (en) | 2014-11-29 | 2015-06-12 | Low-pass filtering amplification audio processing system based on step-down constant current circuit |
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| CN201510323511.1A Withdrawn CN104967947A (en) | 2014-11-29 | 2015-06-12 | Low-pass filtering amplification audio processing system based on step-down constant current circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807514A (en) * | 2015-04-13 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | Two-stage low-pass filter and amplification type engine fuel consumption testing system |
| CN104807577A (en) * | 2015-04-25 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | Torque sensor based on signal linear driving |
| CN110120796A (en) * | 2019-05-22 | 2019-08-13 | 昆明理工大学津桥学院 | Voice signal filtering and amplifying circuit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507738A (en) * | 2015-12-22 | 2016-04-20 | 成都雷纳斯科技有限公司 | Multifunctional high-precision wireless transmission intelligent anti-theft system |
| CN106323482A (en) * | 2016-08-27 | 2017-01-11 | 四川华索自动化信息工程有限公司 | Signal level adjusting type processing system used for flue gas temperature alarm device |
-
2014
- 2014-11-29 CN CN201410715449.6A patent/CN104469613A/en active Pending
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2015
- 2015-06-12 CN CN201510323511.1A patent/CN104967947A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807514A (en) * | 2015-04-13 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | Two-stage low-pass filter and amplification type engine fuel consumption testing system |
| CN104807577A (en) * | 2015-04-25 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | Torque sensor based on signal linear driving |
| CN110120796A (en) * | 2019-05-22 | 2019-08-13 | 昆明理工大学津桥学院 | Voice signal filtering and amplifying circuit |
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| CN104967947A (en) | 2015-10-07 |
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Application publication date: 20150325 |