CN105848058A - Sound frequency point coordinated audio signal processing system - Google Patents
Sound frequency point coordinated audio signal processing system Download PDFInfo
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- CN105848058A CN105848058A CN201610375581.6A CN201610375581A CN105848058A CN 105848058 A CN105848058 A CN 105848058A CN 201610375581 A CN201610375581 A CN 201610375581A CN 105848058 A CN105848058 A CN 105848058A
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Abstract
The invention discloses a sound frequency point coordinated audio signal processing system. The system is characterized by comprising a processing chip U, a field effect de-noising circuit, a triode VT2, an amplifier P2, a polar capacitor C4, a diode D3, a linear filtering circuit, a polar capacitor C5, a signal amplification circuit, a frequency balancing adjustment circuit and an audio modulation circuit, wherein the signal amplification circuit is connected with the processing chip U and the pole N of the diode D3, the frequency balancing adjustment circuit is connected in series between the linear filtering circuit and the signal amplification circuit, and the audio modulation circuit is connected in series between a pin VOUT of the processing chip U and the field effect de-noising circuit. The system can eliminate interference signals in audio signal effectively, adjust the frequency band width of the audio signals, effectively prevent the audio signals from distortion during output, and further to eliminate noises during audio signal transmission effectively and ensure the listening effect of users.
Description
Technical field
The present invention relates to electronic applications, specifically, be a kind of sound frequency cooperative type Audio Signal Processing system
System.
Background technology
Audio reception device has been daily life, learn, work in indispensable instrument, and audio frequency connects
The working stability of receiving unit be otherwise depending on audio frequency processing system.But existing audio frequency processing system without
Interference signal in audio signal is eliminated by method, it is impossible to be adjusted the bandwidth of audio signal,
Thus cause the situation that there will be noise, distortion during audio reception device output signal, have a strong impact on user's
Audibility.
Therefore it provides a kind of interference signal that can eliminate in audio signal, again can be to the frequency band of audio signal
The audio frequency processing system that is adjusted of width be the task of top priority.
Summary of the invention
The signal processing system that it is an object of the invention to overcome face identification system of the prior art is anti-interference
Ability, it is impossible to the defect that the bandwidth of audio signal is adjusted, it is provided that a kind of sound frequency association
Mode audio signal processing.
The present invention is achieved through the following technical solutions: a kind of sound frequency cooperative type Audio Signal Processing system
System, mainly by processing chip U, audion VT2, amplifier P2, with process chip U after positive electrode resistance R9
The polarity electricity that SADN pin is connected, negative pole base stage with audion VT2 after resistance R11 is connected
Appearance C4, N pole is connected with the FB pin processing chip U, P pole is connected with the outfan of amplifier P2
Diode D3, positive pole is connected with the negative input of amplifier P2, the polar capacitor C5 of minus earth,
The signal amplification circuit being connected with the N pole processing chip U and diode D3 respectively, with amplifier P2's
The linear filtering circuit that electrode input end is connected, is serially connected between linear filtering circuit and signal amplification circuit
Frequency equilibrium adjust circuit, respectively with the emitter stage of audion VT2 and process the field that chip U is connected and imitate
Should pipe squelch circuit, and be serially connected in process chip U VOUT pin and field effect transistor squelch circuit between
Audio modulating circuit composition;The colelctor electrode of described audion VT2 is equal with the GND pin processing chip U
Ground connection;The REF pin of described process chip U is connected with LBI pin.
Described audio modulating circuit by audion VT4, amplifier P5, positive pole after resistance R31 with three poles
The polar capacitor C14 that the base stage of pipe VT4 is connected, negative pole is connected with the VOUT pin of process chip U,
Positive pole positive pole with polar capacitor C14 after resistance R29 is connected, the polar capacitor C13 of minus earth,
N pole is connected with the colelctor electrode of audion VT4, P pole after resistance R30 with the positive pole of polar capacitor C14
The diode D10 being connected, one end is connected with the P pole of diode D10, the other end and amplifier P5
Inductance L2, the N pole that is connected of electrode input end after adjustable resistance R36 with the outfan of amplifier P5
Be connected, diode D11 that P pole is connected with the negative input of amplifier P5, one end and diode D11
The resistance R37 that P pole is connected, the other end is connected with the outfan of amplifier P5, negative pole and amplifier
The polarity that the negative input of P5 is connected, positive pole is connected with the P pole of diode D11 after resistance R35
Electric capacity C16, positive pole emitter stage with audion VT4 after resistance R33 is connected, the polarity of minus earth
Electric capacity C15, and P pole negative pole with polar capacitor C14 after resistance R32 is connected, N pole is through resistance
The diode D9 composition that after R34, negative pole with polar capacitor C15 is connected;Described polar capacitor C15's
Negative pole is connected with the P pole of diode D11;The outfan of described amplifier P5 is as audio modulating circuit
Outfan is also connected with field effect transistor squelch circuit.
Described frequency equilibrium adjusts circuit by field effect transistor MOS2, amplifier P3, amplifier P4, three poles
Pipe VT3, positive pole is connected with the source electrode of field effect transistor MOS2, negative pole adjusts circuit as frequency equilibrium
The emitter stage phase of input polar capacitor C9, the N pole that is connected with linear filtering circuit and audion VT3
Diode D6, P that connection, P pole are connected with the grid of field effect transistor MOS2 after resistance R18 are the most suitable
Secondary be connected through resistance R20 electrode input end with amplifier P3 after resistance R19, N pole is through resistance R21
The diode D7 that outfan with amplifier P3 is connected afterwards, positive pole is connected with the outfan of amplifier P3,
The polar capacitor C11 that negative pole is connected with the electrode input end of amplifier P4, positive pole after resistance R27 with put
The electrode input end of big device P4 is connected, negative pole after adjustable resistance R28 with the outfan phase of amplifier P4
The polar capacitor C12 connected, negative pole is connected with the negative input of amplifier P4, positive pole is through resistance R22
The polar capacitor C10 that negative input with amplifier P3 is connected afterwards, and P pole is sequentially through resistance R25
Be connected with the base stage of audion VT3 after resistance R24, defeated with amplifier P4 after N electrode resistance R26
Go out the diode D8 composition that end is connected;The colelctor electrode of described audion VT3 and the negative pole of amplifier P4 are defeated
Enter and hold equal ground connection;The drain electrode of described field effect transistor MOS2 is connected with the electrode input end of amplifier P3;Institute
State the N pole ground connection of diode D8;The outfan of described amplifier P4 adjusts the defeated of circuit as frequency equilibrium
Go out end and be connected with signal amplification circuit.
Described linear filtering electricity routing amplifier P1, negative pole as the input of linear filtering circuit, positive pole with
Polar capacitor C1, the N pole that the electrode input end of amplifier P1 is connected after resistance R3 with amplifier P1
The diode that outfan is connected, P pole electrode input end with amplifier P1 after resistance R1 is connected
D1, negative pole is connected with the outfan of amplifier P1, positive pole after resistance R4 with the negative pole of amplifier P1
The polar capacitor C2 that input is connected, one end is connected with the negative pole of polar capacitor C2, the other end with put
The inductance L1 that the negative input of big device P1 is connected, and the negative input phase of one end and amplifier P1
Connect, other end earth resistance R5 forms;The negative pole of described polar capacitor C2 is defeated with the positive pole of amplifier P2
Enter end to be connected;The outfan of described amplifier P1 is connected with the negative pole of polar capacitor C9.
Described signal amplification circuit by audion VT1, P pole with process chip U LBI pin be connected,
The diode D2 that N pole is sequentially connected with the LX pin processing chip U after resistance R8 through resistance R7,
The resistance that one end is connected with the N pole of diode D2, the other end is connected with the colelctor electrode of audion VT1
R6, the pole that negative pole is connected with the base stage of audion VT1, positive pole is connected with the outfan of amplifier P4
Property electric capacity C3, and one end is connected with the emitter stage of audion VT1, the other end and process chip U
The adjustable resistance R10 composition that FB pin is connected;The emitter stage of described audion VT1 is through adjustable resistance R10
It is connected with the N pole of diode D3 afterwards.
Described field effect transistor squelch circuit is by the grid of field effect transistor MOS1, N pole and field effect transistor MOS1
Be connected, diode D4 that P pole emitter stage with audion VT2 after resistance R12 is connected, negative pole with
The drain electrode of field effect transistor MOS1 is connected, positive pole after resistance R13 with process chip U GND pin
The polar capacitor C6 of ground connection after being connected, positive pole is connected with the VOUT pin processing chip U, negative pole warp
Polar capacitor C8, the P pole being connected with the source electrode of field effect transistor MOS1 after resistance R14 is after resistance R15
Be connected with the LBO pin processing chip U, N pole is as two poles of the outfan of field effect transistor squelch circuit
Pipe D5, positive pole N pole with diode D5 after resistance R17 is connected, the polar capacitor of minus earth
C7, and one end is connected with the drain electrode of field effect transistor MOS1, the other end is connected with polar capacitor C7's
The resistance R16 composition connect;The negative pole of described polar capacitor C8 is connected with the P pole of diode D5;Described
The N pole of diode D5 is connected with the outfan of amplifier P5.
For the practical effect of the present invention, described process chip U preferentially have employed as IW1761 integrated
Chip realizes.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) present invention can not only effectively eliminate the interference signal in audio signal, and can effectively reduce
The noise of audio signal, the bandwidth of audio signal can be adjusted by the present invention simultaneously, effectively prevents
Distortion occurs during audio signal output, thus the noise when present invention has effectively eliminated audio signal transmission,
Ensure that the audibility of user.
(2) sound audio points different in audio signal can be adjusted by the present invention, makes in audio signal not
Co-aural audio point keeps coordinating, though the balanced proportion of the high, medium and low audio frequency output in audio signal, from
And the present invention effectively raises the tonequality of audio reception device output.
(3) present invention can be balanced regulation to sampled audio signal frequency and input audio signal frequency, makes
Sampled audio signal frequency is higher than 2 times of input audio signal highest frequency, i.e. the present invention can make audio signal
Frequency reaches 48KHz, and the tonequality of the audio signal after making the present invention process is consistent with original tonequality.
(4) present invention bandwidth increase of audio signal can be led existing audio signal bandwidth 2
More than Bei, thus effectively raise audio signal components, it is ensured that the tonequality of audio reception device output.
(5) present invention can make the frequency range of audio signal be maintained at 10HZ-22HZ, thus effectively improves
The audio quality of audio reception device output, it is ensured that during audio signal transmission without noise.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the electrical block diagram of the frequency equilibrium adjustment circuit of the present invention.
Fig. 3 is the electrical block diagram of the audio modulating circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is described in further detail, but the enforcement of the present invention
Mode is not limited to this.
Embodiment
As it is shown in figure 1, the present invention is mainly by processing chip U, audion VT2, amplifier P2, resistance
R9, resistance R11, polar capacitor C4, polar capacitor C5, diode D3, audio modulating circuit, frequency
Balanced adjustment circuit, signal amplification circuit, linear filtering circuit, and field effect transistor squelch circuit composition.
During enforcement, it is connected with the SADN pin processing chip U after positive electrode resistance R9 of polar capacitor C4
Connect, negative pole base stage with audion VT2 after resistance R11 is connected.The N pole of diode D3 and process
The FB pin of chip U is connected, P pole is connected with the outfan of amplifier P2.Polar capacitor C5's
Positive pole is connected with the negative input of amplifier P2, minus earth.Signal amplification circuit respectively with process core
The N pole of sheet U and diode D3 is connected.Linear filtering circuit is connected with the electrode input end of amplifier P2
Connect.Frequency equilibrium adjusts circuit and is serially connected between linear filtering circuit and signal amplification circuit.Field effect transistor is quiet
Noise cancellation circuit is connected with emitter stage and the process chip U of audion VT2 respectively.It is serially connected in and processes chip U's
Audio modulating circuit between VOUT pin and field effect transistor squelch circuit.The current collection of described audion VT2
Pole and the equal ground connection of GND pin processing chip U;The REF pin of described process chip U and LBI pin
It is connected.
Wherein, described linear filtering electricity routing amplifier P1, resistance R1, resistance R2, resistance R3, electricity
Resistance R4, resistance R5, polar capacitor C1, polar capacitor C2, inductance L1, regulation diode D1 composition.
During connection, the negative pole of polar capacitor C1 as the input of linear filtering circuit and is adopted with audio signal
Storage is connected, its positive pole is connected with the electrode input end of amplifier P1.The N pole of diode D1 is through electricity
Be connected with the outfan of amplifier P1 after resistance R3, its P pole after resistance R1 with the positive pole of amplifier P1
Input is connected.The negative pole of polar capacitor C2 is connected with the outfan of amplifier P1, its positive pole is through electricity
It is connected with the negative input of amplifier P1 after resistance R4.One end of inductance L1 is negative with polar capacitor C2's
Pole is connected, its other end is connected with the negative input of amplifier P1.One end of resistance R5 and amplification
The negative input of device P1 is connected, its other end ground connection.The negative pole of described polar capacitor C2 and amplifier
The electrode input end of P2 is connected;The outfan of described amplifier P1 is connected with the negative pole of polar capacitor C9.
Further, described signal amplification circuit by audion VT1, resistance R6, resistance R7, resistance R8,
Adjustable resistance R10, polar capacitor C3, and diode D2 form.
During connection, the P pole of diode D2 with process chip U LBI pin be connected, its N pole sequentially
It is connected with the LX pin processing chip U after resistance R8 through resistance R7.One end of resistance R6 and two
The N pole of pole pipe D2 is connected, its other end is connected with the colelctor electrode of audion VT1.Polar capacitor C3
Negative pole be connected with the base stage of audion VT1, its positive pole is connected with the outfan of amplifier P4.Adjustable
One end of resistance R10 is connected with the emitter stage of audion VT1, its other end with process chip U FB
Pin is connected.The emitter stage of described audion VT1 after adjustable resistance R10 with the N pole of diode D3
It is connected.
Further, described field effect transistor squelch circuit is by field effect transistor MOS1, resistance R12, resistance
R13, resistance R14, resistance R15, resistance R16, resistance R17, polar capacitor C6, polar capacitor C7,
Polar capacitor C8, diode D4, and diode D5 form.
During connection, the N pole of diode D4 is connected with the grid of field effect transistor MOS1, its P pole is through electricity
It is connected with the emitter stage of audion VT2 after resistance R12.The negative pole of polar capacitor C6 and field effect transistor MOS1
Drain electrode be connected, its positive pole after resistance R13 with process chip U GND pin be connected after ground connection.
The positive pole of polar capacitor C8 is connected with the VOUT pin processing chip U, its negative pole is after resistance R14
It is connected with the source electrode of field effect transistor MOS1.
Wherein, the P pole of diode D5 after resistance R15 with process chip U LBO pin be connected,
Its N pole as the outfan of field effect transistor squelch circuit and is connected with exterior broadcaster.Polar capacitor C7
Positive pole N pole with diode D5 after resistance R17 be connected, its minus earth.The one of resistance R16
End is connected with the drain electrode of field effect transistor MOS1, its other end is connected with polar capacitor C7's.Described
The negative pole of polar capacitor C8 is connected with the P pole of diode D5;The N pole of described diode D5 and amplification
The outfan of device P5 is connected.
As in figure 2 it is shown, described frequency equilibrium adjusts circuit by field effect transistor MOS2, amplifier P3, amplification
Device P4, audion VT3, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22,
Resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, adjustable resistance R28, polarity electricity
Hold C9, polar capacitor C10, polar capacitor C11, polar capacitor C12, diode D6, diode D7,
And diode D8 composition.
During connection, the positive pole of polar capacitor C9 is connected with the source electrode of field effect transistor MOS2, its negative pole is made
Adjust the input of circuit for frequency equilibrium and be connected with linear filtering circuit.The N pole of diode D6 with
The emitter stage of audion VT3 is connected, its P pole after resistance R18 with the grid phase of field effect transistor MOS2
Connect.The P pole of diode D7 sequentially inputs with the positive pole of amplifier P3 after resistance R20 and resistance R19
End is connected, its N pole outfan with amplifier P3 after resistance R21 is connected.
Meanwhile, the positive pole of polar capacitor C11 be connected with the outfan of amplifier P3, its negative pole and amplification
The electrode input end of device P4 is connected.The positive pole of polar capacitor C12 after resistance R27 with amplifier P4's
Electrode input end is connected, its negative pole outfan with amplifier P4 after adjustable resistance R28 is connected.Pole
The property negative pole of electric capacity C10 is connected with the negative input of amplifier P4, its positive pole after resistance R22 with put
The negative input of big device P3 is connected.The P pole of diode D8 is sequentially after resistance R25 and resistance R24
It is connected with the base stage of audion VT3, is connected with the outfan of amplifier P4 after its N electrode resistance R26.
The colelctor electrode of described audion VT3 and the equal ground connection of negative input of amplifier P4;Described field effect
The drain electrode of pipe MOS2 is connected with the electrode input end of amplifier P3;The N pole ground connection of described diode D8;
The outfan of described amplifier P4 adjusts the outfan of circuit as frequency equilibrium and is connected with signal amplification circuit
Connect.
As it is shown on figure 3, described audio modulating circuit is by audion VT4, amplifier P5, resistance R29, electricity
Resistance R30, resistance R31, resistance R32, resistance R33, resistance R34, resistance R35, adjustable resistance R36,
Resistance R37, polar capacitor C13, polar capacitor C14, polar capacitor C15, polar capacitor C16, two poles
Pipe D9, diode D10, diode D11, and inductance L2 form.
During connection, the positive pole of polar capacitor C14 base stage with audion VT4 after resistance R31 is connected,
Its negative pole is connected with the VOUT pin processing chip U.The positive pole of polar capacitor C13 is through resistance R29
Afterwards the positive pole with polar capacitor C14 be connected, its minus earth.The N pole of diode D10 and audion
The colelctor electrode of VT4 is connected, its P pole positive pole with polar capacitor C14 after resistance R30 is connected.Electricity
One end of sense L2 is connected with the P pole of diode D10, the electrode input end of its other end and amplifier P5
It is connected.The N pole of diode D11 outfan with amplifier P5 after adjustable resistance R36 is connected,
Its P pole is connected with the negative input of amplifier P5.
Meanwhile, one end of resistance R37 be connected with the P pole of diode D11, its other end and amplifier
The outfan of P5 is connected.The negative pole of polar capacitor C16 is connected with the negative input of amplifier P5,
Its positive pole P pole with diode D11 after resistance R35 is connected.The positive pole of polar capacitor C15 is through resistance
After R33 the emitter stage with audion VT4 be connected, its minus earth.The P pole of diode D9 is through resistance
After R32 the negative pole with polar capacitor C14 be connected, its N pole after resistance R34 with polar capacitor C15's
Negative pole is connected.The negative pole of described polar capacitor C15 is connected with the P pole of diode D11;Described amplification
The outfan of device P5 as the outfan of audio modulating circuit and is connected with field effect transistor squelch circuit.
During operation, the present invention can not only effectively eliminate the interference signal in audio signal, effectively reduces sound
Frequently the noise of signal;And the bandwidth of audio signal can be adjusted by the present invention, is effectively prevented
During audio signal output distortion occurs, thus the noise when present invention has effectively eliminated audio signal transmission,
Ensure that the audibility of user.The present invention can be to sampled audio signal frequency and input audio signal frequency simultaneously
Rate is balanced regulation, makes 2 times higher than input audio signal highest frequency of sampled audio signal frequency, i.e.
The present invention can make audio signal frequency reach 48KHz, and the tonequality of the audio signal after making the present invention process is with former
Beginning tonequality is consistent.Sound audio points different in audio signal can be adjusted by the present invention, makes in audio signal
Alternative sounds frequency keep coordinate, even if in audio signal high, medium and low audio frequency output balanced proportion,
Thus the present invention effectively raises the tonequality of audio reception device output.
The present invention bandwidth increase of audio signal can be led 2 times of the bandwidth of existing audio signal with
On, thus effectively raise audio signal components, it is ensured that the tonequality of audio reception device output.This
The bright frequency range that can make audio signal is maintained at 10HZ-22HZ, thus after effectively raising and taking
Quality, it is ensured that during audio signal transmission without noise.For the practical effect of the present invention, described place
Reason chip U preferentially have employed and realizes for the integrated chip of IW1761.
According to above-described embodiment, can well realize the present invention.
Claims (7)
1. a sound frequency cooperative type audio signal processing, it is characterised in that mainly by processing core
Sheet U, audion VT2, amplifier P2, with the SADN pin phase processing chip U after positive electrode resistance R9
Connect, polar capacitor C4, N pole that negative pole base stage with audion VT2 after resistance R11 is connected and place
The diode D3 that FB pin is connected, P pole is connected with the outfan of amplifier P2 of reason chip U, just
Pole is connected with the negative input of amplifier P2, the polar capacitor C5 of minus earth, respectively with process core
The signal amplification circuit that the N pole of sheet U and diode D3 is connected, with the electrode input end phase of amplifier P2
The linear filtering circuit connected, the frequency equilibrium being serially connected between linear filtering circuit and signal amplification circuit is adjusted
Whole circuit, the field effect transistor squelch circuit being connected with emitter stage and the process chip U of audion VT2 respectively,
And it is serially connected in the audio modulating circuit between the VOUT pin and the field effect transistor squelch circuit that process chip U
Composition;The colelctor electrode of described audion VT2 and the equal ground connection of GND pin processing chip U;Described process
The REF pin of chip U is connected with LBI pin.
A kind of sound frequency cooperative type audio signal processing the most according to claim 1, it is special
Levy and be, described audio modulating circuit by audion VT4, amplifier P5, positive pole after resistance R31 with three
The polar capacitor that the base stage of pole pipe VT4 is connected, negative pole is connected with the VOUT pin of process chip U
C14, positive pole positive pole with polar capacitor C14 after resistance R29 is connected, the polar capacitor of minus earth
C13, N pole is connected with the colelctor electrode of audion VT4, P pole after resistance R30 with polar capacitor C14
The diode D10 that is connected of positive pole, one end is connected with the P pole of diode D10, the other end and amplification
Inductance L2, the N pole that the electrode input end of device P5 is connected defeated with amplifier P5 after adjustable resistance R36
Go out the diode D11 that end is connected, P pole is connected, one end and two poles with the negative input of amplifier P5
The resistance R37 that the P pole of pipe D11 is connected, the other end is connected with the outfan of amplifier P5, negative pole with
The negative input of amplifier P5 is connected, positive pole P with diode D11 after resistance R35 is extremely connected
The polar capacitor C16 connect, positive pole emitter stage with audion VT4 after resistance R33 is connected, negative pole connects
The polar capacitor C15 on ground, and P pole negative pole with polar capacitor C14 after resistance R32 is connected, N
The diode D9 composition that pole negative pole with polar capacitor C15 after resistance R34 is connected;Described polarity electricity
The negative pole holding C15 is connected with the P pole of diode D11;The outfan of described amplifier P5 is as audio frequency
The outfan of modulation circuit is also connected with field effect transistor squelch circuit.
A kind of sound frequency cooperative type audio signal processing the most according to claim 2, it is special
Levying and be, described frequency equilibrium adjusts circuit by field effect transistor MOS2, amplifier P3, amplifier P4, and three
Pole pipe VT3, positive pole is connected with the source electrode of field effect transistor MOS2, negative pole adjusts circuit as frequency equilibrium
Input and the emitter stage of polar capacitor C9, the N pole that is connected with linear filtering circuit and audion VT3
Be connected, diode D6, P pole that P pole is connected with the grid of field effect transistor MOS2 after resistance R18
Sequentially be connected through resistance R20 electrode input end with amplifier P3 after resistance R19, N pole is through resistance
The diode D7 that after R21, outfan with amplifier P3 is connected, the outfan phase of positive pole and amplifier P3
The polar capacitor C11 that connection, negative pole are connected with the electrode input end of amplifier P4, positive pole is through resistance R27
Be connected with the electrode input end of amplifier P4 afterwards, negative pole defeated with amplifier P4 after adjustable resistance R28
Going out the polar capacitor C12 that is connected of end, negative pole is connected with the negative input of amplifier P4, positive pole is through electricity
The polar capacitor C10 being connected with the negative input of amplifier P3 after resistance R22, and P pole is sequentially through electricity
Be connected with the base stage of audion VT3 after resistance R25 and resistance R24, after N electrode resistance R26 with amplifier
The diode D8 composition that the outfan of P4 is connected;The colelctor electrode of described audion VT3 and amplifier P4
The equal ground connection of negative input;The electrode input end phase of the drain electrode of described field effect transistor MOS2 and amplifier P3
Connect;The N pole ground connection of described diode D8;The outfan of described amplifier P4 adjusts as frequency equilibrium
The outfan of circuit is also connected with signal amplification circuit.
A kind of sound frequency cooperative type audio signal processing the most according to claim 3, it is special
Levying and be, described linear filtering electricity routing amplifier P1, negative pole is as the input, just of linear filtering circuit
Polar capacitor C1, the N pole that pole is connected with the electrode input end of amplifier P1 after resistance R3 with amplifier
Two poles that the outfan of P1 is connected, P pole electrode input end with amplifier P1 after resistance R1 is connected
Pipe D1, negative pole is connected with the outfan of amplifier P1, positive pole negative with amplifier P1 after resistance R4
The polar capacitor C2 that pole input is connected, one end is connected with the negative pole of polar capacitor C2, the other end with
The inductance L1 that the negative input of amplifier P1 is connected, and the negative input of one end and amplifier P1
Be connected, other end earth resistance R5 forms;The negative pole of described polar capacitor C2 and the positive pole of amplifier P2
Input is connected;The outfan of described amplifier P1 is connected with the negative pole of polar capacitor C9.
A kind of sound frequency cooperative type audio signal processing the most according to claim 4, it is special
Levying and be, described signal amplification circuit is connected with the LBI pin processing chip U by audion VT1, P pole
Connect, N pole sequentially through resistance R7 after resistance R8 with the diode that is connected of LX pin processing chip U
D2, one end is connected with the N pole of diode D2, the other end is connected with the colelctor electrode of audion VT1
Resistance R6, negative pole is connected with the base stage of audion VT1, positive pole is connected with the outfan of amplifier P4
Polar capacitor C3, and one end is connected with the emitter stage of audion VT1, the other end and process chip U
FB pin be connected adjustable resistance R10 composition;The emitter stage of described audion VT1 is through adjustable resistance
After R10, the N pole with diode D3 is connected.
A kind of sound frequency cooperative type audio signal processing the most according to claim 5, it is special
Levying and be, described field effect transistor squelch circuit is by field effect transistor MOS1, N pole and field effect transistor MOS1
The diode D4 that grid is connected, P pole emitter stage with audion VT2 after resistance R12 is connected, negative
Pole is connected with the drain electrode of field effect transistor MOS1, positive pole after resistance R13 with process chip U GND
Pin be connected after the polar capacitor C6 of ground connection, positive pole is connected with the VOUT pin processing chip U, negative
Polar capacitor C8, the P pole that pole is connected with the source electrode of field effect transistor MOS1 after resistance R14 is through resistance
Be connected with the LBO pin processing chip U after R15, N pole is as the outfan of field effect transistor squelch circuit
Diode D5, positive pole N pole with diode D5 after resistance R17 is connected, the polarity of minus earth
Electric capacity C7, and one end is connected with the drain electrode of field effect transistor MOS1, the phase of the other end and polar capacitor C7
The resistance R16 composition connected;The negative pole of described polar capacitor C8 is connected with the P pole of diode D5;Institute
The outfan of the N pole and amplifier P5 of stating diode D5 is connected.
A kind of sound frequency cooperative type audio signal processing the most according to claim 6, it is special
Levying and be, described process chip U is the integrated chip of IW1761.
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2016
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