CN107659873A - A kind of preposition amplifying type Audio Buffer recording system - Google Patents
A kind of preposition amplifying type Audio Buffer recording system Download PDFInfo
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- CN107659873A CN107659873A CN201711094919.1A CN201711094919A CN107659873A CN 107659873 A CN107659873 A CN 107659873A CN 201711094919 A CN201711094919 A CN 201711094919A CN 107659873 A CN107659873 A CN 107659873A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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Abstract
The invention discloses a kind of preposition amplifying type Audio Buffer recording system, it is characterized in that, mainly by microprocessor, memory, modular converter, audio filter circuit and the timer being connected respectively with microprocessor, the pre-amplification circuit being connected with modular converter, the audio collection module being connected with pre-amplification circuit, the audio power amplifying circuit being connected with audio filter circuit, the Audio Buffer circuit being connected with audio power amplifying circuit, and the loudspeaker composition being connected with Audio Buffer circuit；The audio collection module is also connected with microprocessor.The present invention can be suppressed to interfering noise and retain the audio signal of needs, therefore can improve the definition of recording broadcasting.The present invention is provided with audio power amplifying circuit, and it can be amplified to the power of the audio signal of output, thus people can be apparent from listen back to recorded sound.
Description
Technical field
The present invention relates to a kind of recording system, in particular to a kind of preposition amplifying type Audio Buffer recording system.
Background technology
At present, with the needs of scientific and technological development and people's routine work, study and life, sound pick-up outfit has turned into each
The essential appliance and electronic in individual field.
However, existing sound pick-up outfit can all be recorded various sound in recording, it is carried out to audio signal
Impurity audio can not be suppressed well during processing, therefore can be disturbed when people listen back to recording by very big noise；
And the loudspeaker of existing sound pick-up outfit is easily impacted and damaged by signal.
The content of the invention
It is an object of the invention to overcome existing sound pick-up outfit not suppress well to impurity audio, and raise one's voice
A kind of the defects of device is easily impacted and damaged by signal, there is provided preposition amplifying type Audio Buffer recording system.
The purpose of the present invention is achieved through the following technical solutions：A kind of preposition amplifying type Audio Buffer recording system, mainly
By microprocessor, the memory being connected respectively with microprocessor, modular converter, audio filter circuit and timer, with conversion
The pre-amplification circuit that module is connected, the audio collection module being connected with pre-amplification circuit, with audio filter circuit phase
The audio power amplifying circuit of connection, the Audio Buffer circuit being connected with audio power amplifying circuit, and and Audio Buffer
The loudspeaker composition that circuit is connected；The audio collection module is also connected with microprocessor；The Audio Buffer circuit bag
Include amplifier P101, P pole be connected with amplifier P101 negative pole, output end of the N poles after resistance R103 with amplifier P101
The diode D101 being connected, positive pole is connected with diode D101 P poles, negative pole is connected with amplifier P101 output end
Electric capacity C102, one end is connected with amplifier P101 negative pole, the resistance R102, one end and amplifier P101 of other end ground connection
Positive pole be connected, the other end ground connection resistance R101, positive pole is connected with amplifier P101 positive power source terminal, negative pole be grounded
Electric capacity C103, the electric capacity C101 that negative pole is connected with amplifier P101 positive pole, positive pole is connected with audio power amplifying circuit,
And it is serially connected in the resistance R104 between amplifier P101 output end and loudspeaker；The positive power source terminal of the amplifier P101 and
Negative power end connects power supply.
Described audio power amplifying circuit is by amplifier P4, triode VT9, triode VT10, negative pole and amplifier P4
Positive pole be connected, positive pole then formed the audio power amplifying circuit input electric capacity C10, one end and amplifier P4's is negative
Pole is connected, resistance R16, the N pole of other end ground connection is connected with triode VT10 emitter stage, P poles are then after potentiometer R17
The diode D6 being connected with amplifier P4 positive pole, be serially connected in triode VT10 colelctor electrode and amplifier P4 output end it
Between resistance R18, the resistance R19 being serially connected between triode VT10 emitter stage and triode VT9 emitter stage, and positive pole
It is connected with triode VT10 emitter stage, the electric capacity C11 for the output end that negative pole then forms the audio power amplifying circuit is formed；
Grounded collector, its base stage of the triode VT9 is connected with triode VT10 base stage；The output end of the amplifier P4
It is connected with triode VT9 base stage；Control terminal of the P poles of the diode D6 also with potentiometer R17 is connected；The audio
The input of power amplification circuit is connected with the output end of audio filter circuit, its output end is then connected with Audio Buffer circuit
Connect.
The pre-amplification circuit is by amplifier P1, and amplifier P2, XOR gate P3, triode VT8, negative pole is through resistance R10
Be connected afterwards with amplifier P1 positive pole, positive pole then formed the pre-amplification circuit input electric capacity C5, be serially connected in electric capacity
Resistance R9 between C5 negative pole and XOR gate P3 positive pole, one end is connected with XOR gate P3 negative pole, the other end is grounded
Resistance R12, the resistance R11 being serially connected between amplifier P1 positive pole and output end, positive pole is connected with amplifier P1 positive pole,
The electric capacity C6 that negative pole is then connected with amplifier P1 output end, positive pole is connected with amplifier P1 negative pole, negative pole is grounded
Electric capacity C7, the electric capacity C8 that positive pole is connected with electric capacity C7 positive pole, negative pole is then connected with triode VT8 base stage, is serially connected in
Resistance R13 between triode VT8 colelctor electrode and XOR gate P3 output end, positive pole are connected with triode VT8 colelctor electrode
Connect, electric capacity C9, the N pole that negative pole is then connected with XOR gate P3 output end is connected with amplifier P2 negative pole, P poles are then with three
The diode D5 that pole pipe VT8 colelctor electrode is connected, it is serially connected between amplifier P1 output end and amplifier P2 positive pole
Resistance R14, and the resistance R15 compositions being serially connected between amplifier P1 output end and amplifier P2 output end；Described three
Pole pipe VT8 emitter stage is connected with amplifier P1 output end；The output end of the amplifier P2 then forms the preposition amplification
The output end of circuit is simultaneously connected with the input of modular converter；The input of the pre-amplification circuit then with audio collection mould
Block is connected.
The audio filter circuit is by differential amplifier circuit, the suppression circuit group being connected with differential amplifier circuit output end
Into；The input of the differential amplifier circuit is connected with microprocessor, the output end of suppression circuit then with Audio power amplifier
The input of circuit is connected.
The differential amplifier circuit by triode VT1, triode VT2, triode VT3, negative pole after resistance R1 with three poles
Pipe VT1 base stage is connected, positive pole then formed the differential amplifier circuit input electric capacity C1, P pole and triode VT1 collection
Electrode is connected, N poles meet the diode D1 of+20V voltages, and is serially connected in triode VT1 emitter stage and triode VT3 base
Potentiometer R2 compositions between pole；The control terminal of the potentiometer is connected with suppression circuit；The base stage of the triode VT3 with
Triode VT2 colelctor electrode is connected, its emitter stage is then connected with suppression circuit, its grounded collector；The triode VT2
Emitter stage be connected with triode VT1 colelctor electrode, its base stage is then connected with suppression circuit.
The suppression circuit is by filtering chip U, triode VT4, triode VT5, triode VT6, triode VT7, one end
It is connected with diode D1 N poles, the resistance R4 that the other end is then connected after resistance R5 with filtering chip U VDD pins, just
Pole is connected with resistance R4 and resistance R5 tie point, negative pole is then connected with triode VT2 base stage electric capacity C2, N pole with
The diode D2 that filtering chip U VDD pins are connected, P poles are then connected with triode VT2 base stage, one end and filtering core
The resistance R3 that piece U EN pins are connected, the other end is then connected with triode VT3 emitter stage, positive pole after resistance R6 with
Triode VT5 base stage is connected, negative pole is then connected with triode VT5 colelctor electrode electric capacity C4, N pole with electric capacity C4 just
Diode D3, the N pole that pole is connected, P poles are then connected with filtering chip U DRV pins is connected with triode VT5 emitter stage
Connect, the diode D4 that P poles are then connected after resistance R7 with triode VT7 emitter stage, the FB pins of positive pole and filtering chip U
It is connected, the electric capacity C3 that negative pole is then connected with diode D4 P poles, and is serially connected in triode VT7 base stage and colelctor electrode
Between resistance R8 composition；The TOFF pins of the filtering chip U are connected with potentiometer R2 control terminal, its COMP pin then
Be connected with triode VT3 emitter stage, its VSS pin is connected with triode VT6 base stage, its CS pin then with triode
VT4 base stage is connected；The emitter stage of the triode VT6 is connected with electric capacity C3 negative pole, its colelctor electrode then with triode
VT7 base stage is connected；The colelctor electrode of the triode VT7 is connected with -20V voltages；The emitter stage of the triode VT4 with
Triode VT5 base stage is connected, its colelctor electrode then forms the output end of the suppression circuit.
The filtering chip U is UCT4392 integrated chips.
The present invention compared with the prior art, has advantages below and beneficial effect：
(1) present invention can be suppressed to interfering noise and retain the audio signal of needs, therefore can improve recording
The definition of broadcasting.
(2) present invention is provided with timer, and the timer can set recording starting time and recording dwell time, work as record
Sound starting time can then automatically begin to record, and be automatically stopped according to the recording dwell time set, can so make this
The application of invention is wider.
(3) present invention is provided with pre-amplification circuit, and the pre-amplification circuit can be carried out to the audio signal collected
Distortionless amplification, enable rearmounted conversion modulus and microprocessor that preferably audio signal is changed and identified, from
And improve the stability of the present invention.
(4) present invention is provided with audio power amplifying circuit, and it can be amplified to the power of the audio signal of output,
What therefore people can be apparent from listens back to recorded sound.
(5) Audio Buffer circuit of the invention can enter row buffering to signal, avoid loudspeaker from being impacted and damage by signal
It is bad.
Brief description of the drawings
Fig. 1 is the overall structure block diagram of the present invention.
Fig. 2 is the structure chart of the audio filter circuit of the present invention.
Fig. 3 is the structure chart of the pre-amplification circuit of the present invention.
Fig. 4 is the structure chart of the audio power amplifying circuit of the present invention.
Fig. 5 is the structure chart of the Audio Buffer circuit of the present invention
Embodiment
The present invention is described in further detail with reference to embodiment, but embodiments of the present invention are not limited to
This.
Embodiment
As shown in figure 1, the present invention the preposition amplifying type Novel recording system based on audio power amplifying circuit, mainly by
Microprocessor, the memory being connected respectively with microprocessor, modular converter, audio filter circuit and timer, with modulus of conversion
The pre-amplification circuit that block is connected, the audio collection module being connected with pre-amplification circuit, it is connected with audio filter circuit
The audio power amplifying circuit connect, the frequency buffer circuit being connected with audio power amplifying circuit, and with frequency buffer circuit phase
The loudspeaker composition of connection；The audio collection module is also connected with microprocessor.
Wherein, audio collection module is used for the audio signal for gathering the external world, and it is limited that Wei Lin sections of Shenzhen science and technology can be selected in it
The SV-2602 sound acquisition modules of company's production are realized.Pre-amplification circuit can be carried out not to the audio signal collected
The amplification of distortion.Modular converter is used to the audio signal collected is converted to digital electric signal and is sent to microprocessor.It is micro-
Then as the control centre for invention, it is preferentially realized processor using AT89S52 main control chips.Timer, which is used to set, to be recorded
Sound time, memory are then used to store collected audio signal.Audio filter circuit can be to present in audio signal
Noise signals are suppressed, to improve the definition for exporting sound.Audio power amplifying circuit is then used to believe the audio of output
Number power be amplified, further improve recording definition.The timer, memory, modular converter and loudspeaker are adopted
It can be achieved with existing technology.
As shown in Fig. 2 the audio filter circuit can suppress to the noise signals collected, it is by differential amplification
Circuit, the suppression circuit composition being connected with differential amplifier circuit output end.The input and Wei Chu of the differential amplifier circuit
Reason device is connected, and the output end of suppression circuit is then connected with the input of audio power amplifying circuit.
The differential amplifier circuit can be handled the audio signal collected, and it is by triode VT1, triode
VT2, triode VT3, resistance R1, electric capacity C1, potentiometer R2 and diode D1 are formed.
During connection, electric capacity C1 negative pole is connected after resistance R1 with triode VT1 base stage, its positive pole then forms the difference
Divide the input of amplifying circuit.Diode D1 P poles are connected with triode VT1 colelctor electrode, its N pole connects+20V voltages.Electricity
Position device R2 is then serially connected between triode VT1 emitter stage and triode VT3 base stage.The control terminal of the potentiometer and suppression
Circuit is connected；The base stage of the triode VT3 is connected with triode VT2 colelctor electrode, its emitter stage then with suppression circuit
It is connected, its grounded collector.The emitter stage of the triode VT2 is connected with triode VT1 colelctor electrode, its base stage then with
Suppression circuit is connected.
Audio signal input first filters after coming in through electric capacity C1, then is inputed to after resistance R1 by triode VT1 and three poles
The difference amplifier that pipe VT2 is formed is amplified.Resistance R1 is biasing resistor, and it can avoid audio signal in amplification
During there is the existing picture of distortion.Diode D1 is the common P poles diode of the difference amplifier, which determines the differential amplifier circuit
Common-mode rejection ratio and this grade static working current size.
The suppression circuit is by filtering chip U, triode VT4, triode VT5, triode VT6, triode VT7, resistance
R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, diode D2, diode D3, diode D4, electric capacity C2, electric capacity
C3 and electric capacity C4 compositions.
During connection, resistance R4 one end is connected with diode D1 N poles, its other end is then after resistance R5 with filtering core
Piece U VDD pins are connected.Electric capacity C2 positive pole is connected with resistance R4 and resistance R5 tie point, its negative pole then with three poles
Pipe VT2 base stage is connected.Diode D2 N poles are connected with filtering chip U VDD pins, its P pole then with triode VT2
Base stage be connected.Resistance R3 one end is connected with filtering chip U EN pins, its other end then hair with triode VT3
Emitter-base bandgap grading is connected.Electric capacity C4 positive pole is connected after resistance R6 with triode VT5 base stage, its negative pole then with triode VT5
Colelctor electrode be connected.Diode D3 N poles are connected with electric capacity C4 positive pole, its P pole then DRV pins with filtering chip U
It is connected.Diode D4 N poles are connected with triode VT5 emitter stage, its P pole is then after resistance R7 with triode VT7's
Emitter stage is connected.Electric capacity C3 positive pole is connected with filtering chip U FB pins, its negative pole then P poles phase with diode D4
Connection.Resistance R8 is then serially connected between triode VT7 base stage and colelctor electrode.
Meanwhile the TOFF pins of the filtering chip U are connected with potentiometer R2 control terminal, its COMP pin is then with three
Pole pipe VT3 emitter stage is connected, its VSS pin is connected with triode VT6 base stage, its CS pin then with triode VT4
Base stage be connected.The emitter stage of the triode VT6 is connected with electric capacity C3 negative pole, its colelctor electrode then with triode VT7
Base stage be connected.The colelctor electrode of the triode VT7 is connected with -20V voltages.The emitter stage and three of the triode VT4
Pole pipe VT5 base stage is connected, its colelctor electrode then forms the output end of the suppression circuit and defeated with audio power amplifying circuit
Enter end to be connected.
Electric capacity C3, triode VT6, triode VT7, resistance R7 and resistance R8 form a constant-current source circuit, and it is given
Filtering chip U provides constant operating current.Audio signal is conveyed into after filtering chip U, because of the useful audio in audio signal
Signal is different from the frequency of noise signals, and filtering chip U protects to accounting for most useful audio signal in audio signal
Stay, and to noise signals suppress, therefore what is exported from filtering chip U CS pins is useful audio signal, should
The high-pass filtering circuit that useful audio signal is formed via triode VT4, triode VT5, resistance R6 and electric capacity C4 is carried out
Exported after filtering to audio power amplifying circuit.In order to reach more preferable implementation result, filtering chip U is preferably UCT4392
Integrated chip is realized.
As shown in figure 3, pre-amplification circuit is by amplifier P1, amplifier P2, XOR gate P3, triode VT8, electric capacity C5,
Electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, electricity
Hinder R15 and diode D5 compositions.
During connection, before electric capacity C5 negative pole is connected after resistance R10 with amplifier P1 positive pole, its positive pole then forms this
Put the input of amplifying circuit and be connected with audio collection module.Resistance R9 is then serially connected in electric capacity C5 negative pole and XOR gate P3
Positive pole between.Resistance R12 one end is connected with XOR gate P3 negative pole, its other end ground connection.Resistance R11 is serially connected in amplification
Between device P1 positive pole and output end.Electric capacity C6 positive pole is connected with amplifier P1 positive pole, its negative pole then with amplifier P1
Output end be connected.Electric capacity C7 positive pole is connected with amplifier P1 negative pole, its negative pole ground connection.Electric capacity C8 positive pole and electricity
Appearance C7 positive pole is connected, base stage of its negative pole then with triode VT8 is connected.Resistance R13 is then serially connected in triode VT8 collection
Between electrode and XOR gate P3 output end.Electric capacity C9 positive pole is connected with triode VT8 colelctor electrode, its negative pole then with it is different
OR gate P3 output end is connected.Diode D5 N poles are connected with amplifier P2 negative pole, its P pole is then with triode VT8's
Colelctor electrode is connected.Resistance R14 is serially connected between amplifier P1 output end and amplifier P2 positive pole.Resistance R15 is serially connected in
Between amplifier P1 output end and amplifier P2 output end.The emitter stage of the triode VT8 and amplifier P1 output
End is connected；The output end of the amplifier P2 then formed the output end of the pre-amplification circuit and with the input of modular converter
It is connected.
It is amplified after audio signal input is come in by pre-amplification circuit, wherein, resistance R11 can control preceding storing
The gain of big circuit, that is, the gain of the used resistance R11 bigger pre-amplification circuit of resistance are then bigger.And electric capacity C6 and electricity
Low impedance path filtering can be provided high-frequency signal by hindering R11 parallel connections, prevent the existing picture of high-frequency self-excitation.Triode VT8, electric capacity
C8, electric capacity C9, resistance R13 and diode D5 then form a biasing circuit, and it may insure audio signal after amplification also
Very high fidelity can be kept.
As shown in figure 4, audio power amplifying circuit is by amplifier P4, triode VT9, triode VT10, resistance R16, electricity
Position device R17, resistance R18, resistance R19, electric capacity C10, electric capacity C11 and diode D6 composition.
During connection, electric capacity C10 negative pole is connected with amplifier P1 positive pole, its positive pole then forms the Audio power amplifier
The input of circuit is simultaneously connected with the output end of audio filter circuit.Resistance R16 one end is connected with amplifier P4 negative pole
Connect, its other end ground connection.Diode D6 N poles are connected with triode VT10 emitter stage, its P pole is then after potentiometer R17
It is connected with amplifier P4 positive pole.Resistance R18 be then serially connected in triode VT10 colelctor electrode and amplifier P4 output end it
Between.Resistance R19 is serially connected between triode VT10 emitter stage and triode VT9 emitter stage.Electric capacity C11 positive pole and three poles
Pipe VT10 emitter stage is connected, its negative pole then formed the audio power amplifying circuit output end and with Audio Buffer circuit phase
Connection.Grounded collector, its base stage of the triode VT9 is connected with triode VT10 base stage.The amplifier P4's
Output end is connected with triode VT9 base stage；Control terminal of the P poles of the diode D6 also with potentiometer R17 is connected.
Wherein, amplifier P4, resistance R16, potentiometer R17 and diode D6 one inverting amplifier of structure, and adjust
Potentiometer R17 resistance can then adjust the gain of the inverting amplifier.Triode VT10 and triode VT9 then forms a base
Pole is tied, and it forms a backfeed loop with inverting amplifier, and audio signal can be reduced during amplification by this structure
There is the existing picture of cross distortion.
As shown in figure 5, Audio Buffer circuit is connected including amplifier P101, P pole with amplifier P101 negative pole, N poles
The diode D101 being connected after resistance R103 with amplifier P101 output end, positive pole are extremely connected with diode D101 P
Connect, the electric capacity C102 that negative pole is connected with amplifier P101 output end, one end is connected with amplifier P101 negative pole, is another
The resistance R102 of ground connection is held, one end is connected with amplifier P101 positive pole, the resistance R101 of other end ground connection, positive pole and amplification
Device P101 positive power source terminal is connected, negative pole ground connection electric capacity C103, negative pole is connected with amplifier P101 positive pole, positive pole and
The electric capacity C101 that audio power amplifying circuit is connected, and the electricity being serially connected between amplifier P101 output end and loudspeaker
Hinder R104；The positive power source terminal and negative power end of the amplifier P101 connects power supply.Amplifier P101, diode D101, resistance
R103 and electric capacity C102 is collectively forming a buffer, and it can enter row buffering to audio signal, avoid loudspeaker by signal
Impact and damage.
During work, operator sets recording starting time and recording dwell time in timer, when recording starting time
Then microprocessor sends a signal to audio collection module, and the audio collection module starts the extraneous audio signal of collection and conveying
To pre-amplification circuit.The pre-amplification circuit is transferred to modular converter after processing is amplified to audio signal, and modulus of conversion
The audio signal collected is converted to digital electric signal and is transferred to microprocessor by block, and the memory then stores up to audio signal
Deposit.When record dwell time to after microprocessor send a signal to audio collection module stop record.Need to being recorded
When audio plays out, audio signal is then sent to audio filter circuit by microprocessor, and the audio signal is through audio filtered electrical
Played after Lu He, audio power amplifying circuit and Audio Buffer circuit by loudspeaker.
As described above, the present invention can be implemented well.
Claims (7)
- A kind of 1. preposition amplifying type Audio Buffer recording system, it is characterised in that mainly by microprocessor, respectively with microprocessor Memory, modular converter, audio filter circuit and the timer being connected, the pre-amplification circuit being connected with modular converter, The audio collection module being connected with pre-amplification circuit, the audio power amplifying circuit being connected with audio filter circuit, with The Audio Buffer circuit that audio power amplifying circuit is connected, and the loudspeaker composition being connected with Audio Buffer circuit；Institute Audio collection module is stated also with microprocessor to be connected；The Audio Buffer circuit includes amplifier P101, P pole and amplifier The diode D101 that P101 negative pole is connected, N poles are connected after resistance R103 with amplifier P101 output end, positive pole with The electric capacity C102 that diode D101 P poles are connected, negative pole is connected with amplifier P101 output end, one end and amplifier P101 negative pole is connected, the resistance R102 of other end ground connection, and one end is connected with amplifier P101 positive pole, other end ground connection Resistance R101, positive pole is connected with amplifier P101 positive power source terminal, the electric capacity C103 of negative pole ground connection, negative pole and amplifier The electric capacity C101 that P101 positive pole is connected, positive pole is connected with audio power amplifying circuit, and it is serially connected in amplifier P101 Output end and loudspeaker between resistance R104；The positive power source terminal and negative power end of the amplifier P101 connects power supply.
- A kind of 2. preposition amplifying type Audio Buffer recording system according to claim 1, it is characterised in that：Described audio Power amplification circuit by amplifier P4, triode VT9, triode VT10, negative pole is connected with amplifier P4 positive pole, positive pole then The electric capacity C10 of the input of the audio power amplifying circuit is formed, one end is connected with amplifier P4 negative pole, other end ground connection Resistance R16, N pole be connected with triode VT10 emitter stage, the P poles then positive pole phase after potentiometer R17 with amplifier P4 The diode D6 of connection, the resistance R18 being serially connected between triode VT10 colelctor electrode and amplifier P4 output end, is serially connected in Resistance R19 between triode VT10 emitter stage and triode VT9 emitter stage, and the transmitting of positive pole and triode VT10 The electric capacity C11 for the output end that pole is connected, negative pole then forms the audio power amplifying circuit is formed；The collection of the triode VT9 Electrode ground connection, its base stage are connected with triode VT10 base stage；The output end of the amplifier P4 and triode VT9 base stage It is connected；Control terminal of the P poles of the diode D6 also with potentiometer R17 is connected；The audio power amplifying circuit it is defeated Enter end be connected with the output end of audio filter circuit, its output end is then connected with Audio Buffer circuit.
- A kind of 3. preposition amplifying type Audio Buffer recording system according to claim 2, it is characterised in that：Put before described Big electric routing amplifier P1, amplifier P2, XOR gate P3, triode VT8, positive pole of the negative pole after resistance R10 with amplifier P1 Be connected, positive pole then formed the pre-amplification circuit input electric capacity C5, be serially connected in electric capacity C5 negative pole and XOR gate P3 Positive pole between resistance R9, one end is connected with XOR gate P3 negative pole, the other end ground connection resistance R12, be serially connected in amplification Resistance R11 between device P1 positive pole and output end, positive pole is connected with amplifier P1 positive pole, negative pole is then with amplifier P1's The electric capacity C6 that output end is connected, positive pole is connected with amplifier P1 negative pole, the electric capacity C7 of negative pole ground connection, positive pole and electric capacity C7 Positive pole be connected, the electric capacity C8 that negative pole is then connected with triode VT8 base stage, be serially connected in triode VT8 colelctor electrode and Resistance R13 between XOR gate P3 output end, positive pole is connected with triode VT8 colelctor electrode, negative pole then with XOR gate P3 Electric capacity C9, the N pole that is connected of output end be connected with amplifier P2 negative pole, colelctor electrode of the P poles then with triode VT8 is connected The diode D5 connect, the resistance R14 being serially connected between amplifier P1 output end and amplifier P2 positive pole, and be serially connected in and put Resistance R15 compositions between big device P1 output end and amplifier P2 output end；The emitter stage of the triode VT8 and amplification Device P1 output end is connected；The output end of the amplifier P2 then forms the output end of the pre-amplification circuit and and modulus of conversion The input of block is connected；The input of the pre-amplification circuit is then connected with audio collection module.
- A kind of 4. preposition amplifying type Audio Buffer recording system according to claim 3, it is characterised in that：The audio filter Wave circuit is by differential amplifier circuit, the suppression circuit composition being connected with differential amplifier circuit output end；The differential amplification electricity The input on road is connected with microprocessor, and the output end of suppression circuit is then connected with the input of audio power amplifying circuit Connect.
- A kind of 5. preposition amplifying type Audio Buffer recording system according to claim 4, it is characterised in that：The difference is put Big circuit by triode VT1, triode VT2, triode VT3, negative pole is connected after resistance R1 with triode VT1 base stage, Electric capacity C1, the P pole that positive pole then forms the input of the differential amplifier circuit is connected with triode VT1 colelctor electrode, N poles connect+ The diode D1 of 20V voltages, and the potentiometer R2 being serially connected between triode VT1 emitter stage and triode VT3 base stage Composition；The control terminal of the potentiometer is connected with suppression circuit；The base stage of the triode VT3 and triode VT2 current collection Pole is connected, its emitter stage is then connected with suppression circuit, its grounded collector；The emitter stage of the triode VT2 and three poles Pipe VT1 colelctor electrode is connected, its base stage is then connected with suppression circuit.
- A kind of 6. preposition amplifying type Audio Buffer recording system according to claim 5, it is characterised in that：It is described to suppress electricity Filtering chip U, triode VT4, triode VT5 are route, triode VT6, triode VT7, one end is extremely connected with diode D1 N Connect, the resistance R4 that the other end is then connected after resistance R5 with filtering chip U VDD pins, positive pole and resistance R4 and resistance R5 Tie point be connected, electric capacity C2, N pole that negative pole is then connected with triode VT2 base stage and filtering chip U VDD pins It is connected, the diode D2 that P poles are then connected with triode VT2 base stage, one end is connected with filtering chip U EN pins, The resistance R3 that the other end is then connected with triode VT3 emitter stage, base stage of the positive pole with triode VT5 after resistance R6 are connected Connect, electric capacity C4, the N pole that negative pole is then connected with triode VT5 colelctor electrode is connected with electric capacity C4 positive pole, P poles then with filter Diode D3, the N pole that ripple chip U DRV pins are connected is connected with triode VT5 emitter stage, P poles are then after resistance R7 The diode D4 being connected with triode VT7 emitter stage, positive pole is connected with filtering chip U FB pins, negative pole is then with two The electric capacity C3 that pole pipe D4 P poles are connected, and the resistance R8 compositions being serially connected between triode VT7 base stage and colelctor electrode； The TOFF pins of the filtering chip U are connected with potentiometer R2 control terminal, the then transmitting with triode VT3 of its COMP pin Pole is connected, its VSS pin is connected with triode VT6 base stage, its base stage of CS pins then with triode VT4 is connected； The emitter stage of the triode VT6 is connected with electric capacity C3 negative pole, base stage of its colelctor electrode then with triode VT7 is connected； The colelctor electrode of the triode VT7 is connected with -20V voltages；The emitter stage of the triode VT4 and triode VT5 base stage It is connected, its colelctor electrode then forms the output end of the suppression circuit.
- A kind of 7. preposition amplifying type Audio Buffer recording system according to claim 6, it is characterised in that：The filtering core Piece U is UCT4392 integrated chips.
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| CN201711094919.1A CN107659873A (en) | 2017-11-07 | 2017-11-07 | A kind of preposition amplifying type Audio Buffer recording system |
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| CN201711094919.1A CN107659873A (en) | 2017-11-07 | 2017-11-07 | A kind of preposition amplifying type Audio Buffer recording system |
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