CN104954945A - Wide pulse trigger type adjustable audio processing system based on phase shifting processing - Google Patents
Wide pulse trigger type adjustable audio processing system based on phase shifting processing Download PDFInfo
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Abstract
The invention discloses a wide pulse trigger type adjustable audio processing system based on phase shifting processing. The wide pulse trigger type adjustable audio processing system is composed of an audio generator, a frequency selection circuit, a microprocessing circuit, an adjustable filter circuit, a phase shifting processing circuit and an amplifying circuit, wherein the frequency selection circuit is connected with the audio generator, the microprocessing circuit is connected with the frequency selection circuit, the adjustable filter circuit and the phase shifting processing circuit are connected with the microprocessing circuit, and the amplifying circuit is connected with the phase shifting processing circuit. The wide pulse trigger type adjustable audio processing system is characterized in that a wide pulse trigger circuit is further arranged between the frequency selection circuit and the phase shifting processing circuit. According to the wide pulse trigger type adjustable audio processing system, the wide pulse trigger circuit is adopted to provide wide trigger pulses, so that voice processed by the wide pulse trigger type adjustable audio processing system is soft, and the auditory effect is increased.
Description
Technical field
The present invention relates to a kind of electronic system, specifically refer to a kind of adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process.
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, because the audio frequency processing system used in home theater exists certain defect, cause sound not soft, have influence on film play quality.
Summary of the invention
The object of the invention is to overcome the bad defect of its audio frequency treatment effect of current audio treatment system, a kind of adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process is provided.
The following technical scheme of object of the present invention realizes: a kind of adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process, it is by audio-frequency generator, the frequency selection circuit be connected with audio-frequency generator, the micro-processor interface circuit be connected with frequency selection circuit, the tunable filter circuit be connected with micro-processor interface circuit and phase shift treatment circuit, the amplifying circuit be connected with phase shift treatment circuit, and be arranged on the broad pulse circuits for triggering composition between frequency selection circuit and phase shift treatment circuit.
Further, described broad pulse circuits for triggering are by triode VT6, triode VT7, unidirectional thyristor D7, field effect transistor MOS1, N pole is connected with the emitter of triode VT6 after diode D6 through diode D5 in turn, P pole is then in turn through voltage stabilizing didoe D3 that diode D4 is connected with the collector electrode of triode VT6 after resistance R21, one end is connected with the N pole of voltage stabilizing didoe D3, the potentiometer R19 that the other end is then connected with the P pole of voltage stabilizing didoe D3 after resistance R20, negative pole is connected with the P pole of voltage stabilizing didoe D3 and frequency selection circuit respectively, the polar capacitor C15 that positive pole is then connected with the grid of field effect transistor MOS1, one end is connected with the base stage of triode VT6, the resistance R22 of the other end then ground connection, one end is connected with the source electrode of field effect transistor MOS1, the resistance R23 that the other end is then connected with the N pole of unidirectional thyristor D7, and one end is connected with the P pole of unidirectional thyristor D7, the resistance R24 that the other end is then connected with phase shift treatment circuit forms, the grid of described field effect transistor MOS1 is respectively with the positive pole of polar capacitor C15 and the collector electrode of triode VT6 is connected, its its source electrode that is then connected with the base stage of triode VT6 of draining then is connected with the control pole of unidirectional thyristor D7, the base stage of described triode VT7 is connected with the P pole of voltage stabilizing didoe D3, its collector electrode is then connected with the grid of field effect transistor MOS1, its grounded emitter, the sliding end of described potentiometer R19 is then connected with the N pole of voltage stabilizing didoe D3.
Described phase shift treatment circuit is by phase shift chip U1, triode VT4, triode VT5, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R6 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 R5, the polar capacitor C6 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 R7, the polar capacitor C8 that negative pole is connected with the collector electrode of triode VT4, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C7 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R8 that the other end is connected with amplifying circuit, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D1 that N pole is connected with the base stage of triode VT4, 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 VT5 forms, the VCC-pin of described phase shift chip U1 is connected with the P pole of unidirectional thyristor D7 after resistance R24, OUT pin is connected with the sliding end of potentiometer R8, the emitter of triode VT4 is connected with the base stage of triode VT5, the collector electrode of triode VT5 is connected with amplifying circuit, and the negative pole of polar capacitor C6 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 forms primary Ioops 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 of audio-frequency generator with the tie point of resistance R1, polar capacitor C2 is connected with another output of audio-frequency generator with the tie point of resistance R2, resistance R1 is connected with micro-processor interface circuit with the tie point of polar capacitor C3, and resistance R2 is then connected with the negative pole of micro-processor interface circuit and polar capacitor C15 respectively 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 electrode 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 electrode of triode VT1 forms; The collector electrode of described triode VT2 is connected with the tie point of polar capacitor C3 with resistance R1, its emitter is connected with tunable filter circuit, the emitter of triode VT1 is connected with the negative pole of polar capacitor C6, and the negative pole of polar capacitor C5 is connected with the tie point of resistance R2 with polar capacitor C4.
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 C11 that negative pole is connected with the output of operational amplifier T1 after potentiometer R16 through resistance R15, positive pole is connected with the normal phase input end of operational amplifier T1, the polar capacitor C13 that negative pole is connected with the collector electrode of triode VT3, negative pole is connected with the output of operational amplifier T1, the polar capacitor C12 that positive pole is connected with the positive pole of polar capacitor C11 after resistance R14, positive pole is connected with the emitter of triode VT3, the polar capacitor C14 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 C14, the resistance R17 that the other end is then connected with the inverting input of operational amplifier T2 after potentiometer R18 forms, the inverting input of described 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 C11, its emitter is also connected with the positive pole of polar capacitor C12.
Described amplifying circuit is by operational amplifier T3, positive pole is connected with the OUT pin of phase shift chip U1 after potentiometer R8, the polar capacitor C9 that negative pole is connected with the collector electrode of triode VT5 after resistance R9, negative pole is connected with the negative pole of polar capacitor C9, the polar capacitor C10 that positive pole is connected with the normal phase input end of operational amplifier T3 after resistance R11, one end is connected with the positive pole of polar capacitor C10, the resistance R10 that the other end is connected with the inverting input of operational amplifier T3 after resistance R12, and the resistance R13 be serially connected between the inverting input of operational amplifier T3 and output forms, the tie point ground connection of resistance R10 and resistance R12.
Described phase shift chip U1 is LM741 integrated chip.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention adopts phase-shift circuit to make the filter effect of audio frequency processing system better, avoids audio frequency processing system to be subject to not needing ripple interference frequently, thus improves film play quality.
(2) phase shift chip of the present invention uses LM741 integrated chip, and its reaction speed is fast, cheap.
(3) as long as the present invention's adjustment potentiometer R16 and potentiometer R18, then can adjust the frequency filtering of audio frequency processing system, thus better can filter out noise.
(4) the present invention adopts broad pulse circuits for triggering, and it can provide wider trigger impulse, thus the sound after process of the present invention can be made softer, improves auditory effect.
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, the present invention is by audio-frequency generator, the frequency selection circuit be connected with audio-frequency generator, the micro-processor interface circuit be connected with frequency selection circuit, the tunable filter circuit be connected with micro-processor interface circuit and phase shift treatment circuit, the amplifying circuit be connected with phase shift treatment circuit, and be arranged on the broad pulse circuits for triggering composition between frequency selection circuit and phase shift treatment circuit.
Wherein, phase shift treatment circuit is by phase shift chip U1, triode VT4, triode VT5, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R6 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 R5, the polar capacitor C6 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 R7, the polar capacitor C8 that negative pole is connected with the collector electrode of triode VT4, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C7 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R8 that the other end is connected with amplifying circuit, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D1 that N pole is connected with the base stage of triode VT4, 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 VT5 forms.
The VCC-pin of this phase shift chip U1 is connected with broad pulse circuits for triggering, its OUT pin is connected with the sliding end of potentiometer R8, the emitter of triode VT4 is connected with the base stage of triode VT5, the collector electrode of triode VT5 is connected with amplifying circuit, and the negative pole of polar capacitor C6 is connected with micro-processor interface circuit.Phase shift treatment circuit can make the filter effect of audio frequency processing system better, improves film play quality.In order to ensure implementation result, described phase shift chip U1 elects LM741 integrated chip as.
Frequency selection circuit can screen signal, picks out useful signal.It is by polar capacitor C1, polar capacitor C2, polar capacitor C3, polar capacitor C4, resistance R1, and resistance R2 forms.
During connection, the positive pole of this polar capacitor C1 forms primary Ioops 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 of audio-frequency generator with the tie point of resistance R1, polar capacitor C2 is connected with another output of audio-frequency generator with the tie point of resistance R2, resistance R1 is connected with micro-processor interface circuit with the tie point of polar capacitor C3, and resistance R2 is then connected with micro-processor interface circuit and broad pulse circuits for triggering respectively with the tie point of polar capacitor C4.This audio-frequency generator adopts prior art to realize.
Described micro-processor interface circuit is by triode VT1, triode VT2, the resistance R3 that one end is connected with the collector electrode 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 electrode of triode VT1 forms.
The collector electrode of this triode VT2 is connected with the tie point of polar capacitor C3 with resistance R1, its emitter is connected with tunable filter circuit, the emitter of triode VT1 is connected with the negative pole of polar capacitor C6, and the negative pole of polar capacitor C5 is connected with the tie point of resistance R2 with polar capacitor C4.
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 C11 that negative pole is connected with the output of operational amplifier T1 after potentiometer R16 through resistance R15, positive pole is connected with the normal phase input end of operational amplifier T1, the polar capacitor C13 that negative pole is connected with the collector electrode of triode VT3, negative pole is connected with the output of operational amplifier T1, the polar capacitor C12 that positive pole is connected with the positive pole of polar capacitor C11 after resistance R14, positive pole is connected with the emitter of triode VT3, the polar capacitor C14 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 C14, the resistance R17 that the other end is then connected with the inverting input of operational amplifier T2 after potentiometer R18 forms.
During connection, the inverting input of this 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 C11, its emitter is also connected with the positive pole of polar capacitor C12.As long as people adjust potentiometer R16 and potentiometer R18, then can adjust the frequency filtering of audio frequency processing system, thus better can filter out noise.
Described amplifying circuit is then by operational amplifier T3, positive pole is connected with the OUT pin of phase shift chip U1 after potentiometer R8, the polar capacitor C9 that negative pole is connected with the collector electrode of triode VT5 after resistance R9, negative pole is connected with the negative pole of polar capacitor C9, the polar capacitor C10 that positive pole is connected with the normal phase input end of operational amplifier T3 after resistance R11, one end is connected with the positive pole of polar capacitor C10, the resistance R10 that the other end is connected with the inverting input of operational amplifier T3 after resistance R12, and the resistance R13 be serially connected between the inverting input of operational amplifier T3 and output forms, the tie point ground connection of resistance R10 and resistance R12.
Broad pulse circuits for triggering are inventive point place of the present invention, it comprises triode VT6, triode VT7, unidirectional thyristor D7, field effect transistor MOS1, N pole is connected with the emitter of triode VT6 after diode D6 through diode D5 in turn, P pole then in turn through the voltage stabilizing didoe D3 that diode D4 is connected with the collector electrode of triode VT6 after resistance R21, the potentiometer R19 that one end is connected with the N pole of voltage stabilizing didoe D3, the other end is then connected with the P pole of voltage stabilizing didoe D3 after resistance R20.
In order to wider trigger impulse can be provided, these broad pulse circuits for triggering are also provided with negative pole and are connected with the tie point of resistance R2 with the P pole of voltage stabilizing didoe D3 and polar capacitor C4 respectively, the polar capacitor C15 that positive pole is then connected with the grid of field effect transistor MOS1, one end is connected with the base stage of triode VT6, the resistance R22 of the other end then ground connection, one end is connected with the source electrode of field effect transistor MOS1, the resistance R23 that the other end is then connected with the N pole of unidirectional thyristor D7, and one end is connected with the P pole of unidirectional thyristor D7, the resistance R24 that the other end is then connected with the VCC-pin of phase shift chip U1.
Meanwhile, the grid of this field effect transistor MOS1 is respectively with the positive pole of polar capacitor C15 and the collector electrode of triode VT6 is connected, its its source electrode that is then connected with the base stage of triode VT6 of draining then is connected with the control pole of unidirectional thyristor D7.The base stage of described triode VT7 is connected with the P pole of voltage stabilizing didoe D3, its collector electrode is then connected with the grid of field effect transistor MOS1, its grounded emitter.The sliding end of described potentiometer R19 is then connected with the N pole of voltage stabilizing didoe D3.
After audio signal is input into broad pulse circuits for triggering, voltage stabilizing didoe D3 does voltage stabilizing process to audio signal, and voltage charges to polar capacitor C15 after potentiometer R19 and resistance R20.When the charging voltage on polar capacitor C15 not yet reaches the peak point voltage of field effect transistor MOS1, the base potential of this triode VT6 is higher, and at this moment triode VT6 ends.When the charging voltage on polar capacitor C15 reaches the peak point voltage of field effect transistor MOS1, at this moment field effect transistor MOS1 then conducting, the current potential simultaneously in triode VT6 base stage sharply declines, at this moment triode VT6 then conducting.Simultaneously, voltage is charged to polar capacitor C15 by diode D5 and diode D6 and triode VT6, the current potential on polar capacitor C15 is made to maintain on the peak point voltage of field effect transistor MOS1, until just turn off during voltage zero-cross, so then broaden trigger impulse, thus make the better effects if of audio frequency process.
As mentioned above, just well the present invention can be realized.
Claims (7)
1. the adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process, it is by audio-frequency generator, the frequency selection circuit be connected with audio-frequency generator, the micro-processor interface circuit be connected with frequency selection circuit, the tunable filter circuit be connected with micro-processor interface circuit and phase shift treatment circuit, and the amplifying circuit to be connected with phase shift treatment circuit forms, and it is characterized in that: be also provided with broad pulse circuits for triggering between frequency selection circuit and phase shift treatment circuit, described broad pulse circuits for triggering are by triode VT6, triode VT7, unidirectional thyristor D7, field effect transistor MOS1, N pole is connected with the emitter of triode VT6 after diode D6 through diode D5 in turn, P pole is then in turn through voltage stabilizing didoe D3 that diode D4 is connected with the collector electrode of triode VT6 after resistance R21, one end is connected with the N pole of voltage stabilizing didoe D3, the potentiometer R19 that the other end is then connected with the P pole of voltage stabilizing didoe D3 after resistance R20, negative pole is connected with the P pole of voltage stabilizing didoe D3 and frequency selection circuit respectively, the polar capacitor C15 that positive pole is then connected with the grid of field effect transistor MOS1, one end is connected with the base stage of triode VT6, the resistance R22 of the other end then ground connection, one end is connected with the source electrode of field effect transistor MOS1, the resistance R23 that the other end is then connected with the N pole of unidirectional thyristor D7, and one end is connected with the P pole of unidirectional thyristor D7, the resistance R24 that the other end is then connected with phase shift treatment circuit forms, the grid of described field effect transistor MOS1 is respectively with the positive pole of polar capacitor C15 and the collector electrode of triode VT6 is connected, its its source electrode that is then connected with the base stage of triode VT6 of draining then is connected with the control pole of unidirectional thyristor D7, the base stage of described triode VT7 is connected with the P pole of voltage stabilizing didoe D3, its collector electrode is then connected with the grid of field effect transistor MOS1, its grounded emitter, the sliding end of described potentiometer R19 is then connected with the N pole of voltage stabilizing didoe D3.
2. a kind of adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process according to claim 1, it is characterized in that: described phase shift treatment circuit is by phase shift chip U1, triode VT4, triode VT5, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R6 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 R5, the polar capacitor C6 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 R7, the polar capacitor C8 that negative pole is connected with the collector electrode of triode VT4, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C7 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R8 that the other end is connected with amplifying circuit, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D1 that N pole is connected with the base stage of triode VT4, 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 VT5 forms, the VCC-pin of described phase shift chip U1 is connected with the P pole of unidirectional thyristor D7 after resistance R24, OUT pin is connected with the sliding end of potentiometer R8, the emitter of triode VT4 is connected with the base stage of triode VT5, the collector electrode of triode VT5 is connected with amplifying circuit, and the negative pole of polar capacitor C6 is connected with micro-processor interface circuit.
3. a kind of adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process according to claim 2, 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 forms primary Ioops 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 of audio-frequency generator with the tie point of resistance R1, polar capacitor C2 is connected with another output of audio-frequency generator with the tie point of resistance R2, resistance R1 is connected with micro-processor interface circuit with the tie point of polar capacitor C3, and resistance R2 is then connected with the negative pole of micro-processor interface circuit and polar capacitor C15 respectively with the tie point of polar capacitor C4.
4. a kind of adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process according to claim 3, 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 electrode 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 electrode of triode VT1 forms; The collector electrode of described triode VT2 is connected with the tie point of polar capacitor C3 with resistance R1, its emitter is connected with tunable filter circuit, the emitter of triode VT1 is connected with the negative pole of polar capacitor C6, and the negative pole of polar capacitor C5 is connected with the tie point of resistance R2 with polar capacitor C4.
5. a kind of adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process 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 C11 that negative pole is connected with the output of operational amplifier T1 after potentiometer R16 through resistance R15, positive pole is connected with the normal phase input end of operational amplifier T1, the polar capacitor C13 that negative pole is connected with the collector electrode of triode VT3, negative pole is connected with the output of operational amplifier T1, the polar capacitor C12 that positive pole is connected with the positive pole of polar capacitor C11 after resistance R14, positive pole is connected with the emitter of triode VT3, the polar capacitor C14 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 C14, the resistance R17 that the other end is then connected with the inverting input of operational amplifier T2 after potentiometer R18 forms, the inverting input of described 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 C11, its emitter is also connected with the positive pole of polar capacitor C12.
6. a kind of adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process according to claim 5, it is characterized in that: described amplifying circuit is by operational amplifier T3, positive pole is connected with the OUT pin of phase shift chip U1 after potentiometer R8, the polar capacitor C9 that negative pole is connected with the collector electrode of triode VT5 after resistance R9, negative pole is connected with the negative pole of polar capacitor C9, the polar capacitor C10 that positive pole is connected with the normal phase input end of operational amplifier T3 after resistance R11, one end is connected with the positive pole of polar capacitor C10, the resistance R10 that the other end is connected with the inverting input of operational amplifier T3 after resistance R12, and the resistance R13 be serially connected between the inverting input of operational amplifier T3 and output forms, the tie point ground connection of resistance R10 and resistance R12.
7. a kind of adjustable audio frequency processing system of broad pulse trigger-type based on phase shift process according to any one of claim 2 ~ 6, is characterized in that: described phase shift chip U1 is LM741 integrated chip.
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| CN201510321129.7A CN104954945A (en) | 2014-11-26 | 2015-06-07 | Wide pulse trigger type adjustable audio processing system based on phase shifting processing |
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| CN201410691802.1A CN104469612A (en) | 2014-11-26 | 2014-11-26 | Filter frequency adjustable audio processing system based on phase shift processing |
| CN2014106918021 | 2014-11-26 | ||
| CN201510321129.7A CN104954945A (en) | 2014-11-26 | 2015-06-07 | Wide pulse trigger type adjustable audio processing system based on phase shifting processing |
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| CN104954945A true CN104954945A (en) | 2015-09-30 |
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| CN104469612A (en) * | 2014-11-26 | 2015-03-25 | 成都创图科技有限公司 | Filter frequency adjustable audio processing system based on phase shift processing |
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| Title |
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| 方大千，郑鹏，朱征涛: "《晶闸管实用电路详解》", 30 April 2012 * |
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Application publication date: 20150930 |