CN104954943A - Phase shifting type audio processing system based on common-source amplifying circuit - Google Patents
Phase shifting type audio processing system based on common-source amplifying circuit Download PDFInfo
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- CN104954943A CN104954943A CN201510317334.6A CN201510317334A CN104954943A CN 104954943 A CN104954943 A CN 104954943A CN 201510317334 A CN201510317334 A CN 201510317334A CN 104954943 A CN104954943 A CN 104954943A
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Abstract
The invention discloses a phase shifting type audio processing system based on a common-source amplifying circuit. The phase shifting type audio processing system based on the common-source amplifying circuit consists of an audio acquiring module, a frequency selecting circuit, a micro-processing circuit, a current source circuit, a two-stage low-pass filtering amplifying circuit and a phase shifting processing circuit, wherein the frequency selecting circuit is connected with the audio acquiring module; the micro-processing circuit and the current source circuit are connected with the frequency selecting circuit; the two-stage low-pass filtering amplifying circuit is connected with an outputting end of the micro-processing circuit and an outputting end of the current source circuit; and the phase shifting processing circuit is arranged at an outputting end of the two-stage low-pass filtering amplifying circuit. The phase shifting type audio processing system based on the common-source amplifying circuit is characterized in that the common-source amplifying circuit is serially connected between the micro-processing circuit and the two-stage low-pass filtering amplifying circuit. The two-stage low-pass filtering amplifying circuit is combined to the common-source amplifying circuit creatively, audio signals can be amplified in an undistorted manner under the combined action of the two amplifying circuits, a sound effect can be high, and a movie playing quality is improved.
Description
Technical field
The present invention relates to a kind of electronic system, specifically refer to the phase shift audio frequency processing system based on common source amplifying circuit.
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, the audio frequency processing system used in current home theater its there is certain defect, namely its sound exported is less, making people often there will be the unclear situation of sound when watching film, thus having influence on film play quality.
Summary of the invention
The object of the invention is to overcome the less defect of its sound exported of current audio treatment system, a kind of phase shift audio frequency processing system based on common source amplifying circuit is provided.
The following technical scheme of object of the present invention realizes: based on the phase shift audio frequency processing system of common source amplifying circuit, it is by 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, the two-stage low-pass filtering amplifying circuit be simultaneously connected with the output of current source circuit with micro-processor interface circuit, be arranged on the phase shift treatment circuit of the output of two-stage low-pass filtering amplifying circuit, and the common source amplifying circuit be serially connected between micro-processor interface circuit and two-stage low-pass filtering amplifying circuit forms.
Further, described common source amplifying circuit is by field effect transistor Q2, field effect transistor Q3, triode VT9, negative pole is connected with the grid of field effect transistor Q2, the polar capacitor C15 that positive pole is then connected with micro-processor interface circuit, N pole is connected with the grid of field effect transistor Q2, the diode D4 that P pole is then connected with the base stage of triode VT9, one end is connected with the drain electrode of field effect transistor Q2, the resistance R20 of other end ground connection after resistance R21, one end is connected with the source electrode of field effect transistor Q2, the other end then meets the resistance R19 of 12V voltage after resistance R18, positive pole is connected with the tie point of resistance R19 with resistance R18, the polar capacitor C16 that negative pole is then connected with the drain electrode of field effect transistor Q3, N pole is connected with the negative pole of polar capacitor C16, the diode D5 that P pole is then connected with the grid of field effect transistor Q3, and one end is connected with the collector electrode of triode VT9, the resistance R22 that the other end is then connected with the source electrode of field effect transistor Q3 forms, the base stage of described triode VT9 is connected with the tie point of resistance R21 with resistance R20, its emitter is then connected with the grid of field effect transistor Q3, the source electrode of described field effect transistor Q3 is connected with the base stage of triode VT9 and two-stage low-pass filtering amplifying circuit respectively.
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 the output of system together with its emitter, 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 stage, and polar capacitor C2 is then connected with another output stage 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 the positive pole of current source circuit and polar capacitor C15 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 source electrode of field effect transistor Q3, 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.
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 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) the present invention original creation employing two-stage low-pass filtering amplifying circuit and common source amplifying circuit combine, distortionless audio signal can be amplified by the acting in conjunction of two amplifying circuits, 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.
Fig. 2 is common source amplification circuit 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 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, the two-stage low-pass filtering amplifying circuit be simultaneously connected with the output of current source circuit with micro-processor interface circuit, be arranged on the phase shift treatment circuit of the output of two-stage low-pass filtering amplifying circuit, and the common source amplifying circuit be serially connected between micro-processor interface circuit and two-stage low-pass filtering amplifying circuit forms.
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.
During connection, the IN1 pin of this 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 the output of system together with its emitter, 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 to realize.
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.
During enforcement, the collector electrode of 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 stage, and polar capacitor C2 is then connected with another output stage 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.It is when connecting, 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 common source 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 common source amplifying circuit, 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 shown in Figure 2, this common source amplifying circuit is by field effect transistor Q2, and field effect transistor Q3, triode VT9, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, polar capacitor C15, polar capacitor C16, diode D4 and diode D5 form.
During connection, the negative pole of polar capacitor C15 is connected with the grid of field effect transistor Q2, its positive pole is then connected with micro-processor interface circuit, the N pole of diode D4 is connected with the grid of field effect transistor Q2, its P pole is then connected with the base stage of triode VT9, one end of resistance R20 is connected with the drain electrode of field effect transistor Q2, its other end is ground connection after resistance R21, one end of resistance R19 is connected with the source electrode of field effect transistor Q2, its other end then connects 12V voltage after resistance R18, the positive pole of polar capacitor C16 is connected with the tie point of resistance R19 with resistance R18, its negative pole is then connected with the drain electrode of field effect transistor Q3, the N pole of diode D5 is connected with the negative pole of polar capacitor C16, its P pole is then connected with the grid of field effect transistor Q3, one end of resistance R22 is connected with the collector electrode of triode VT9, its other end is then connected with the source electrode of field effect transistor Q3.
Meanwhile, the base stage of this triode VT9 is connected with the tie point of resistance R21 with resistance R20, its emitter is then connected with the grid of field effect transistor Q3.The source electrode of described field effect transistor Q3 is connected with the base stage of triode VT9 and two-stage low-pass filtering amplifying circuit respectively.Wherein, this field effect transistor Q2, triode VT9, field effect transistor Q3 and resistance R22 form a commonsource amplifier.By the process of this common source amplifying circuit, audio signal is more stable after amplification.
As mentioned above, just well the present invention can be realized.
Claims (7)
1. based on the phase shift audio frequency processing system of common source amplifying circuit, it is by 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, the two-stage low-pass filtering amplifying circuit be simultaneously connected with the output of current source circuit with micro-processor interface circuit, and the phase shift treatment circuit of the output being arranged on two-stage low-pass filtering amplifying circuit forms, it is characterized in that, between micro-processor interface circuit and two-stage low-pass filtering amplifying circuit, be also serially connected with common source amplifying circuit, described common source amplifying circuit is by field effect transistor Q2, field effect transistor Q3, triode VT9, negative pole is connected with the grid of field effect transistor Q2, the polar capacitor C15 that positive pole is then connected with micro-processor interface circuit, N pole is connected with the grid of field effect transistor Q2, the diode D4 that P pole is then connected with the base stage of triode VT9, one end is connected with the drain electrode of field effect transistor Q2, the resistance R20 of other end ground connection after resistance R21, one end is connected with the source electrode of field effect transistor Q2, the other end then meets the resistance R19 of 12V voltage after resistance R18, positive pole is connected with the tie point of resistance R19 with resistance R18, the polar capacitor C16 that negative pole is then connected with the drain electrode of field effect transistor Q3, N pole is connected with the negative pole of polar capacitor C16, the diode D5 that P pole is then connected with the grid of field effect transistor Q3, and one end is connected with the collector electrode of triode VT9, the resistance R22 that the other end is then connected with the source electrode of field effect transistor Q3 forms, the base stage of described triode VT9 is connected with the tie point of resistance R21 with resistance R20, its emitter is then connected with the grid of field effect transistor Q3, the source electrode of described field effect transistor Q3 is connected with the base stage of triode VT9 and two-stage low-pass filtering amplifying circuit respectively.
2. the phase shift audio frequency processing system based on common source amplifying circuit according to claim 1, it is characterized in that: 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 the output of system together with its emitter, and the negative pole of polar capacitor C12 is connected with two-stage low-pass filtering amplifying circuit.
3. the phase shift audio frequency processing system based on common source amplifying circuit 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 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 stage, and polar capacitor C2 is then connected with another output stage of audio collection module with the tie point of polar capacitor C3.
4. the phase shift audio frequency processing system based on common source amplifying circuit according to claim 3, 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 the positive pole of current source circuit and polar capacitor C15 simultaneously, and the source electrode of described field effect transistor Q1 is connected with current source circuit.
5. the phase shift audio frequency processing system based on common source amplifying circuit 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 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.
6. the phase shift audio frequency processing system based on common source amplifying circuit according to claim 5, 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 source electrode of field effect transistor Q3, 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.
7. the phase shift audio frequency processing system based on common source amplifying circuit according to claim 6, is characterized in that: described phase shift chip U1 is LM741 integrated chip.
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| 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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| CN201410692835.8A CN104410942A (en) | 2014-11-26 | 2014-11-26 | Phase shift type audio processing system by low-pass filtering and amplification |
| CN2014106928358 | 2014-11-26 | ||
| 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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| CN107889025A (en) * | 2017-11-28 | 2018-04-06 | 刘宏波 | Audio signal conversion equipment and method |
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| CN104410770A (en) * | 2014-11-26 | 2015-03-11 | 成都创图科技有限公司 | Novel phase-shift image processing system |
| 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 |
| 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 |
| CN110120796B (en) * | 2019-05-22 | 2022-10-28 | 昆明理工大学津桥学院 | Voice signal amplifying and filtering circuit |
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| 王勇，陈光梦: "《模拟电子学基础与数字逻辑基础学习指南》", 30 September 2013 * |
Cited By (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 |
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| CN104410942A (en) | 2015-03-11 |
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