CN104918188A - Pulse amplification type audio processing system based on low-pass filtering - Google Patents
Pulse amplification type audio processing system based on low-pass filtering Download PDFInfo
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- CN104918188A CN104918188A CN201510309548.9A CN201510309548A CN104918188A CN 104918188 A CN104918188 A CN 104918188A CN 201510309548 A CN201510309548 A CN 201510309548A CN 104918188 A CN104918188 A CN 104918188A
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Abstract
The invention discloses a pulse amplification type audio processing system based on low-pass filtering. The pulse amplification type audio processing system is mainly composed of an audio acquisition module, a frequency selection circuit, a pulse amplification circuit, a micro-processing circuit and a current source circuit, wherein the frequency selection circuit and the pulse amplification circuit are connected with the audio acquisition module, the micro-processing circuit and the current source circuit are connected with the frequency selection circuit, and a two-stage low-pass filtering and amplification circuit is arranged at the output ends of the micro-processing circuit and the current source circuit. The pulse amplification type audio processing system can avoid wrongly triggering through the function of a pulse amplification triggering circuit, thereby greatly increasing accuracy of the system; and the pulse amplification type audio processing system is provided with the two-stage low-pass filtering and amplification circuit which can amplify audio signals without distortion, so that the sound effect is better and the film playing quality is improved.
Description
Technical field
The present invention relates to a kind of electronic system, specifically refer to a kind of pulse amplifying type audio frequency processing system based on low-pass filtering.
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, a kind of pulse amplifying type audio frequency processing system based on low-pass filtering can stablizing processing audio is provided.
The following technical scheme of object of the present invention realizes:
Based on the pulse amplifying type audio frequency processing system of low-pass filtering, primarily of audio collection module, the frequency selection circuit be connected with audio collection module, pulse amplifying circuit, the micro-processor interface circuit be all connected with frequency selection circuit and current source circuit form, and are also provided with two-stage low-pass filtering amplifying circuit at the output of micro-processor interface circuit and current source circuit, described pulse amplifying circuit is by amplification chip U101, NOR gate A101, flip chip U102, be serially connected in the resistance R101 between the D pin of amplification chip U101 and SD pin, P pole is connected with the CD pin of amplification chip U101, the diode D101 that N pole is then connected with the IN pin of flip chip U102 after polar capacitor C101, the output of one end AND OR NOT gate A101 is connected, the resistance R102 that the other end is then connected with the CON pin of flip chip U102, and negative pole is connected with CAP pin with the HOLD pin of flip chip U102 respectively, the polar capacitor C102 of plus earth forms, the CLK pin of described amplification chip U101 is connected with correction circuit, the negative pole of its Q2 pin then AND OR NOT gate A101 is connected, the positive pole of its Q1 pin then AND OR NOT gate A101 is connected, the negative pole of described NOR gate A101 is connected with the N pole of diode D101, the REF pin ground connection of described flip chip U102, the CLK pin of amplification chip U101 is connected with an output of audio collection module.
Described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with micro-processor interface circuit, the electric capacity 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 current source circuit, positive pole is connected with amplifier P1 inverting input after resistance R8, the electric capacity C7 that negative pole is connected with the negative pole of electric capacity C6, be serially connected in the electric capacity C8 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the electric capacity 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 electric capacity C10 of ground connection while negative pole is connected with the negative pole of electric capacity C8, one end is connected with the positive pole of electric capacity 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 electric capacity 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 electric capacity C8 negative pole, and the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2.
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 electric capacity C1 that electric capacity C2 is connected with the base stage of triode VT1 after electric capacity 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 electric capacity C1, its emitter is then connected with current source circuit, the emitter of triode VT1 is then connected with the tie point of electric capacity C2 and electric capacity C3 and micro-processor interface circuit simultaneously, and the positive pole of electric capacity C1 is connected with the OUT pin of flip chip U102.
Described micro-processor interface circuit comprises electric capacity C4, electric capacity C5, resistance R6, and field effect transistor Q1; The positive pole of electric capacity 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 electric capacity C5 is connected with the drain electrode of field effect transistor Q1, positive pole is then connected with the positive pole of current source circuit and electric capacity C6 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 electric capacity 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.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention is provided with two-stage low-pass filtering amplifying 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.
(3) the present invention is by the effect of pulse amplifying circuits for triggering, can avoid the triggering of this appearance mistake, thus substantially increase the precision of system.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the circuit diagram of pulse amplifying circuit of the present invention.
Description of reference numerals:
10, pulse amplifying circuit; 20, audio collection module.
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, 2, the present invention is primarily of audio collection module 20, the frequency selection circuit be connected with audio collection module 20, pulse amplifying circuit 10, the micro-processor interface circuit be all connected with frequency selection circuit and current source circuit form, and are also provided with two-stage low-pass filtering amplifying circuit at the output of micro-processor interface circuit and current source circuit.
Described pulse amplifying circuit 10 is by amplification chip U101, NOR gate A101, and flip chip U102, resistance R101, resistance R102, diode D101, polar capacitor C101, polar capacitor C102 form; During connection, resistance R101 is serially connected between the D pin of amplification chip U101 and SD pin, the P pole of diode D101 is connected with the CD pin of amplification chip U101, N pole is then connected with the IN pin of flip chip U102 after polar capacitor C101, the output of one end AND OR NOT gate A101 of resistance R102 is connected, the other end is then connected with the CON pin of flip chip U102, and the negative pole of polar capacitor C102 is connected with CAP pin with the HOLD pin of flip chip U102 respectively, plus earth; The CLK pin of described amplification chip U101 is connected with correction circuit, the negative pole of its Q2 pin then AND OR NOT gate A101 is connected, the positive pole of its Q1 pin then AND OR NOT gate A101 is connected; The negative pole of described NOR gate A101 is connected with the N pole of diode D101; The REF pin ground connection of described flip chip U102, the CLK pin of amplification chip U101 is connected with an output of audio collection module 20.Wherein, the model of amplification chip U101 is preferably 74LS74, and the model of flip chip U102 is preferably LF398.
Two-stage low-pass filtering amplifying circuit distortionlessly can amplify audio signal, makes sound effect better improve film play quality.It is by amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with micro-processor interface circuit, the electric capacity 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 current source circuit, positive pole is connected with amplifier P1 inverting input after resistance R8, the electric capacity C7 that negative pole is connected with the negative pole of electric capacity C6, be serially connected in the electric capacity C8 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the electric capacity 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 electric capacity C10 of ground connection while negative pole is connected with the negative pole of electric capacity C8, one end is connected with the positive pole of electric capacity 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 electric capacity 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 electric capacity C8 negative pole, and the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2.
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 electric capacity C1 that electric capacity C2 is connected with the base stage of triode VT1 after electric capacity 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 electric capacity C1, its emitter is then connected with current source circuit, the emitter of triode VT1 is then connected with the tie point of electric capacity C2 and electric capacity C3 and micro-processor interface circuit simultaneously, and the positive pole of electric capacity C1 is connected with the OUT pin of flip chip U102.
Micro-processor interface circuit comprises electric capacity C4, electric capacity C5, resistance R6, and field effect transistor Q1; The positive pole of electric capacity 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 electric capacity C5 is connected with the drain electrode of field effect transistor Q1, positive pole is then connected with the positive pole of current source circuit and electric capacity C6 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 electric capacity 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.
As mentioned above, just well the present invention can be realized.
Claims (5)
1. based on the pulse amplifying type audio frequency processing system of low-pass filtering, it is characterized in that: primarily of audio collection module (20), the frequency selection circuit be connected with audio collection module (20), pulse amplifying circuit (10), the micro-processor interface circuit be all connected with frequency selection circuit and current source circuit form, and are also provided with two-stage low-pass filtering amplifying circuit at the output of micro-processor interface circuit and current source circuit, described pulse amplifying circuit (10) is by amplification chip U101, NOR gate A101, flip chip U102, be serially connected in the resistance R101 between the D pin of amplification chip U101 and SD pin, P pole is connected with the CD pin of amplification chip U101, the diode D101 that N pole is then connected with the IN pin of flip chip U102 after polar capacitor C101, the output of one end AND OR NOT gate A101 is connected, the resistance R102 that the other end is then connected with the CON pin of flip chip U102, and negative pole is connected with CAP pin with the HOLD pin of flip chip U102 respectively, the polar capacitor C102 of plus earth forms, the CLK pin of described amplification chip U101 is connected with correction circuit, the negative pole of its Q2 pin then AND OR NOT gate A101 is connected, the positive pole of its Q1 pin then AND OR NOT gate A101 is connected, the negative pole of described NOR gate A101 is connected with the N pole of diode D101, the REF pin ground connection of described flip chip U102, the CLK pin of amplification chip U101 is connected with an output of audio collection module (20).
2. the pulse amplifying type audio frequency processing system based on low-pass filtering according to claim 1, 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 micro-processor interface circuit, the electric capacity 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 current source circuit, positive pole is connected with amplifier P1 inverting input after resistance R8, the electric capacity C7 that negative pole is connected with the negative pole of electric capacity C6, be serially connected in the electric capacity C8 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the electric capacity 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 electric capacity C10 of ground connection while negative pole is connected with the negative pole of electric capacity C8, one end is connected with the positive pole of electric capacity 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 electric capacity 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 electric capacity C8 negative pole, and the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2.
3. the pulse amplifying type audio frequency processing system based on low-pass filtering according to claim 2, 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 electric capacity C1 that electric capacity C2 is connected with the base stage of triode VT1 after electric capacity 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 electric capacity C1, its emitter is then connected with current source circuit, the emitter of triode VT1 is then connected with the tie point of electric capacity C2 and electric capacity C3 and micro-processor interface circuit simultaneously, and the positive pole of electric capacity C1 is connected with the OUT pin of flip chip U102.
4. the pulse amplifying type audio frequency processing system based on low-pass filtering according to claim 3, is characterized in that: described micro-processor interface circuit comprises electric capacity C4, electric capacity C5, resistance R6, and field effect transistor Q1; The positive pole of electric capacity 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 electric capacity C5 is connected with the drain electrode of field effect transistor Q1, positive pole is then connected with the positive pole of current source circuit and electric capacity C6 simultaneously, and the source electrode of described field effect transistor Q1 is connected with current source circuit.
5. the pulse amplifying type audio frequency processing system based on low-pass filtering according to claim 4, 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 electric capacity 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510309548.9A CN104918188A (en) | 2014-11-19 | 2015-06-08 | Pulse amplification type audio processing system based on low-pass filtering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410665634.9A CN104410940A (en) | 2014-11-19 | 2014-11-19 | An audio processing system based on low pass filter and amplification |
| CN2014106656349 | 2014-11-19 | ||
| CN201510309548.9A CN104918188A (en) | 2014-11-19 | 2015-06-08 | Pulse amplification type audio processing system based on low-pass filtering |
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| CN104918188A true CN104918188A (en) | 2015-09-16 |
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| CN201410665634.9A Pending CN104410940A (en) | 2014-11-19 | 2014-11-19 | An audio processing system based on low pass filter and amplification |
| CN201510309548.9A Withdrawn CN104918188A (en) | 2014-11-19 | 2015-06-08 | Pulse amplification type audio processing system based on low-pass filtering |
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| CN201410665634.9A Pending CN104410940A (en) | 2014-11-19 | 2014-11-19 | An audio processing system based on low pass filter and amplification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888193A (en) * | 2016-09-29 | 2018-04-06 | 维谛技术有限公司 | A kind of signal acquisition circuit and signal picker |
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2014
- 2014-11-19 CN CN201410665634.9A patent/CN104410940A/en active Pending
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- 2015-06-08 CN CN201510309548.9A patent/CN104918188A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888193A (en) * | 2016-09-29 | 2018-04-06 | 维谛技术有限公司 | A kind of signal acquisition circuit and signal picker |
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Application publication date: 20150916 |