CN104410942A - Phase shift type audio processing system by low-pass filtering and amplification - Google Patents
Phase shift type audio processing system by low-pass filtering and amplification Download PDFInfo
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- CN104410942A CN104410942A CN201410692835.8A CN201410692835A CN104410942A CN 104410942 A CN104410942 A CN 104410942A CN 201410692835 A CN201410692835 A CN 201410692835A CN 104410942 A CN104410942 A CN 104410942A
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Abstract
The invention discloses a phase shift type audio processing system by low-pass filtering and amplification. The phase shift type audio processing system by low-pass filtering and amplification mainly comprises an audio acquisition module, a frequency selection circuit, a micro-processing circuit, a current source circuit and a two-stage low-pass filtering and amplification circuit, wherein the frequency selection circuit is connected with the audio acquisition module, the micro-processing circuit and the current source circuit are connected with the frequency selection circuit, and the two-stage low-pass filtering and amplification circuit is connected with the output ends of the micro-processing circuit and the current source circuit. The phase shift type audio processing system by low-pass filtering and amplification is characterized in that a phase-shift processing circuit is further arranged at the output end of the two-stage low-pass filtering and amplification circuit and comprises a phase-shift chip U1, a triode VT7, a triode VT8, a resistor R15 and the like, wherein one end of the resistor R15 is connected with a VCC+ pin of the phase-shift chip U1 while the other end of the resistor R15 is connected with an IN1 pin of the phase-shift chip U1. The phase shift type audio processing system by low-pass filtering and amplification has the advantage that by the aid of the phase-shift processing circuit, higher stability of audio signals subjected to processing of the audio processing system can be guaranteed.
Description
Technical field
The present invention relates to a kind of electronic system, specifically refer to that a kind of phase shift low-pass filtering 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 phase shift low-pass filtering can stablizing processing audio to amplify audio frequency processing system.
The following technical scheme of object of the present invention realizes: a kind of phase shift low-pass filtering amplifies audio frequency processing system, primarily of audio collection module, the frequency selection circuit be connected with audio collection module, the micro-processor interface circuit be all connected with frequency selection circuit and current source circuit, form with the two-stage low-pass filtering amplifying circuit that micro-processor interface circuit is connected with the output of current source circuit simultaneously, phase shift treatment circuit is also provided with at the output of two-stage low-pass filtering amplifying circuit, described phase shift treatment circuit is by phase shift chip U1, triode VT7, triode VT8, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R15 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R14, the polar capacitor C12 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R16, the polar capacitor C14 that negative pole is connected with the collector electrode of triode VT7, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C13 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R17 that the other end is connected with the collector electrode of triode VT8, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D3 that N pole is connected with the base stage of triode VT7, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT8 forms, the IN1 pin of described phase shift chip U1 is connected with two-stage low-pass filter circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R15, the emitter of triode VT7 is connected with the base stage of triode VT8, the collector electrode of triode VT8 is as an output of system, emitter as another output of system, and the negative pole of polar capacitor C12 is connected with two-stage low-pass filtering amplifying 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 connected with the positive pole of polar capacitor C1, its emitter is then connected with current source circuit and two-stage low-pass filtering amplifying circuit simultaneously, the emitter of triode VT1 is then connected with the tie point of polar capacitor C2 and polar capacitor C3 and micro-processor interface circuit simultaneously, the positive pole of polar capacitor C1 is connected with audio collection module output, and polar capacitor C2 is then connected with another output of audio collection module with the tie point of polar capacitor C3.
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 emitter of triode VT1, 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 the emitter of external power source and triode VT2 simultaneously.
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 polar capacitor 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 emitter of triode VT2, 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 the negative pole of polar capacitor C10, the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2, the output of amplifier P2 is also connected with the IN1 pin of phase shift chip U1, and the negative pole of polar capacitor C10 is connected with the negative pole of polar capacitor C12.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention is provided with phase shift treatment circuit, and it can ensure that the audio signal after audio frequency processing system process is more stable.
(2) two-stage low-pass filtering amplifying circuit of the present invention, it distortionlessly can amplify audio signal, makes sound effect better improve film play quality.
(3) structure of the present invention is simple, and energy efficient.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram 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, phase shift low-pass filtering of the present invention amplifies audio frequency processing system, primarily of audio collection module, the frequency selection circuit be connected with audio collection module, the micro-processor interface circuit be all connected with frequency selection circuit and current source circuit, form with the two-stage low-pass filtering amplifying circuit that micro-processor interface circuit is connected with the output of current source circuit simultaneously; Phase shift treatment circuit is also provided with at the output of two-stage low-pass filtering amplifying circuit.
Described phase shift treatment circuit is by phase shift chip U1, triode VT7, triode VT8, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R15 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R14, the polar capacitor C12 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R16, the polar capacitor C14 that negative pole is connected with the collector electrode of triode VT7, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C13 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R17 that the other end is connected with the collector electrode of triode VT8, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D3 that N pole is connected with the base stage of triode VT7, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT8 forms, the IN1 pin of described phase shift chip U1 is connected with two-stage low-pass filter circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R15, the emitter of triode VT7 is connected with the base stage of triode VT8, the collector electrode of triode VT8 is as an output of system, emitter as another output of system, and the negative pole of polar capacitor C12 is connected with two-stage low-pass filtering amplifying circuit.Phase shift treatment circuit, can ensure that the audio signal after audio frequency processing system process is more stable.In order to ensure implementation result, described phase shift chip U1 is preferably LM741 integrated chip.
Frequency selection circuit can screen signal, picks out useful signal.It 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 connected with the positive pole of polar capacitor C1, its emitter is then connected with current source circuit and two-stage low-pass filtering amplifying circuit simultaneously, the emitter of triode VT1 is then connected with the tie point of polar capacitor C2 and polar capacitor C3 and micro-processor interface circuit simultaneously, the positive pole of polar capacitor C1 is connected with audio collection module output, and polar capacitor C2 is then connected with another output of audio collection module with the tie point of polar capacitor C3.
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 emitter of triode VT1, 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 the emitter of external power source and triode VT2 simultaneously.
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 polar capacitor 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 emitter of triode VT2, 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 the negative pole of polar capacitor C10, the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2, the output of amplifier P2 is also connected with the IN1 pin of phase shift chip U1, and the negative pole of polar capacitor C10 is connected with the negative pole of polar capacitor C12.
As mentioned above, just well the present invention can be realized.
Claims (5)
1. a phase shift low-pass filtering amplifies audio frequency processing system, primarily of audio collection module, the frequency selection circuit be connected with audio collection module, the micro-processor interface circuit be all connected with frequency selection circuit and current source circuit, form with the two-stage low-pass filtering amplifying circuit that micro-processor interface circuit is connected with the output of current source circuit simultaneously, it is characterized in that: be also provided with phase shift treatment circuit at the output of two-stage low-pass filtering amplifying circuit, described phase shift treatment circuit is by phase shift chip U1, triode VT7, triode VT8, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R15 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R14, the polar capacitor C12 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R16, the polar capacitor C14 that negative pole is connected with the collector electrode of triode VT7, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C13 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R17 that the other end is connected with the collector electrode of triode VT8, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D3 that N pole is connected with the base stage of triode VT7, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT8 forms, the IN1 pin of described phase shift chip U1 is connected with two-stage low-pass filter circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R15, the emitter of triode VT7 is connected with the base stage of triode VT8, the collector electrode of triode VT8 is as an output of system, emitter as another output of system, and the negative pole of polar capacitor C12 is connected with two-stage low-pass filtering amplifying circuit.
2. a kind of phase shift low-pass filtering 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 connected with the positive pole of polar capacitor C1, its emitter is then connected with current source circuit and two-stage low-pass filtering amplifying circuit simultaneously, the emitter of triode VT1 is then connected with the tie point of polar capacitor C2 and polar capacitor C3 and micro-processor interface circuit simultaneously, the positive pole of polar capacitor C1 is connected with audio collection module output, and polar capacitor C2 is then connected with another output of audio collection module with the tie point of polar capacitor C3.
3. a kind of phase shift low-pass filtering 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 emitter of triode VT1, 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. a kind of phase shift low-pass filtering 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 the emitter of external power source and triode VT2 simultaneously.
5. a kind of phase shift low-pass filtering 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 polar capacitor 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 emitter of triode VT2, 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 the negative pole of polar capacitor C10, the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2, the output of amplifier P2 is also connected with the IN1 pin of phase shift chip U1, and the negative pole of polar capacitor C10 is connected with the negative pole of polar capacitor C12.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692835.8A CN104410942A (en) | 2014-11-26 | 2014-11-26 | Phase shift type audio processing system by low-pass filtering and amplification |
| CN201510317334.6A CN104954943A (en) | 2014-11-26 | 2015-06-10 | Phase shifting type audio processing system based on common-source amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410692835.8A CN104410942A (en) | 2014-11-26 | 2014-11-26 | Phase shift type audio processing system by low-pass filtering and amplification |
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| CN104410942A true CN104410942A (en) | 2015-03-11 |
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| CN201410692835.8A Pending CN104410942A (en) | 2014-11-26 | 2014-11-26 | Phase shift type audio processing system by low-pass filtering and amplification |
| CN201510317334.6A Withdrawn CN104954943A (en) | 2014-11-26 | 2015-06-10 | Phase shifting type audio processing system based on common-source amplifying circuit |
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| CN201510317334.6A Withdrawn CN104954943A (en) | 2014-11-26 | 2015-06-10 | Phase shifting type audio processing system based on common-source amplifying circuit |
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Cited By (4)
| 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 |
| CN104916020A (en) * | 2014-11-26 | 2015-09-16 | 成都冠深科技有限公司 | Novel phase-shifting type image processing system based on common source amplifying circuit |
| CN104954943A (en) * | 2014-11-26 | 2015-09-30 | 成都冠深科技有限公司 | Phase shifting type audio processing system based on common-source amplifying circuit |
| 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107889025A (en) * | 2017-11-28 | 2018-04-06 | 刘宏波 | Audio signal conversion equipment and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100544200C (en) * | 2003-12-12 | 2009-09-23 | 瀰工科技股份有限公司 | The electronic circuit of impedance matching |
| CN104410942A (en) * | 2014-11-26 | 2015-03-11 | 成都创图科技有限公司 | Phase shift type audio processing system by low-pass filtering and amplification |
| CN104901635B (en) * | 2015-06-10 | 2018-06-19 | 思瑞浦微电子科技（苏州）股份有限公司 | A kind of low noise PSSR amplifier circuits |
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2014
- 2014-11-26 CN CN201410692835.8A patent/CN104410942A/en active Pending
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104916020A (en) * | 2014-11-26 | 2015-09-16 | 成都冠深科技有限公司 | Novel phase-shifting type image processing system based on common source amplifying circuit |
| CN104954943A (en) * | 2014-11-26 | 2015-09-30 | 成都冠深科技有限公司 | Phase shifting type audio processing system based on common-source amplifying circuit |
| 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 |
| 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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| CN104954943A (en) | 2015-09-30 |
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Application publication date: 20150311 |