CN205792469U - A kind of audio signal dynamic frequency gain formula audio signal processing - Google Patents

Abstract

The utility model discloses a kind of audio signal dynamic frequency gain formula audio signal processing, it is characterized in that, mainly by processing chip U, field effect transistor squelch circuit, audio modulating circuit, audion VT2, amplifier P2, polar capacitor C4, diode D3, linear filtering circuit, polar capacitor C5, the signal amplification circuit being connected with the N pole processing chip U and diode D3 respectively, the frequency equilibrium being serially connected between linear filtering circuit and signal amplification circuit adjusts circuit, and the signal dynamics being serially connected between the emitter stage of audion VT2 and field effect transistor squelch circuit adjusts circuit composition.This utility model can not only effectively eliminate the interference signal in audio signal, and the bandwidth of audio signal can be adjusted, when being effectively prevented audio signal output, distortion occurs, thus the noise that this utility model is when having effectively eliminated audio signal transmission, it is ensured that the audibility of user.

Description

A kind of audio signal dynamic frequency gain formula audio signal processing

Technical field

This utility model relates to electronic applications, specifically, is a kind of audio signal dynamic frequency gain formula sound Audio signalprocessing 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.

Utility model content

The purpose of this utility model is that the signal processing system overcoming face identification system of the prior art resists Interference performance is poor, it is impossible to the defect being adjusted the bandwidth of audio signal, it is provided that a kind of audio frequency letter Number dynamic frequency gain formula audio signal processing.

This utility model is achieved through the following technical solutions: a kind of audio signal dynamic frequency gain formula audio frequency Signal processing system, mainly by processing chip U, audion VT2, amplifier P2, after positive electrode resistance R9 Be connected with the SADN pin processing chip U, negative pole after resistance R11 with the base stage phase of audion VT2 Polar capacitor C4, the N pole connected is connected with the FB pin processing chip U, P pole and amplifier P2 The diode D3 that outfan is connected, positive pole is connected with the negative input of amplifier P2, minus earth Polar capacitor C5, respectively with the signal amplification circuit that is connected of N pole processing chip U and diode D3, The linear filtering circuit being connected with the electrode input end of amplifier P2, is serially connected in linear filtering circuit and signal Frequency equilibrium between amplifying circuit adjusts circuit, respectively with emitter stage and the process chip U of audion VT2 The field effect transistor squelch circuit being connected, is serially connected in emitter stage and the field effect transistor squelch circuit of audion VT2 Between signal dynamics adjust circuit, and be serially connected in process chip U VOUT pin quiet with field effect transistor Audio modulating circuit composition between noise cancellation circuit；The colelctor electrode of described audion VT2 is with process chip U's The equal ground connection of GND pin；The REF pin of described process chip U is connected with LBI pin.

Described signal dynamics adjusts circuit by audion VT5, field effect transistor MOS3, amplifier P6, N pole Be connected with the grid of field effect transistor MOS3, P pole sequentially after resistance R40 and resistance R41 with audion The diode D12 that the emitter stage of VT5 is connected, negative pole is connected with the junction point of resistance R40 with resistance R41 Connect, polar capacitor C18 that positive pole electrode input end with amplifier P6 after resistance R43 is connected, negative pole After resistance R45 the outfan with amplifier P6 be connected, positive pole after resistance R42 with audion VT5 Polar capacitor C19, the P pole that is connected of base stage emitter stage with audion VT5 after resistance R44 be connected Connect, diode D13, P pole that N pole negative pole with polar capacitor C19 after resistance R46 is connected and field The diode D14 that the source electrode of effect pipe MOS3 is connected, N pole is connected with the colelctor electrode of audion VT5, Positive pole drain electrode with field effect transistor MOS3 after resistance R38 is connected, the polar capacitor C17 of minus earth, And one end is connected with the negative pole of polar capacitor C17, the other end is connected with the colelctor electrode of audion VT5 Resistance R39 composition；The source electrode of described field effect transistor MOS3 is connected with the emitter stage of audion VT5； The P pole of described diode D12 is connected with the emitter stage of audion VT2；The output of described amplifier P6 Hold and adjust the outfan of circuit as signal dynamics and be connected with field effect transistor squelch circuit.

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 outfan with amplifier P6 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 practical effect of the present utility model, described process chip U preferentially have employed as IW1761 Integrated chip realizes.

This utility model compared with prior art, has the following advantages and beneficial effect:

(1) this utility model can not only effectively eliminate the interference signal in audio signal, and can be effective Reducing the noise of audio signal, the bandwidth of audio signal can be adjusted by this utility model simultaneously, has There is distortion in the audio signal that prevents of effect when exporting, thus this utility model has effectively eliminated audio signal Noise during transmission, it is ensured that the audibility of user.

(2) this utility model can effectively improve the dynamic frequency of audio signal, makes this utility model export Audio signal is consistent with the audio signal of input, though the sound that the audio signal of this utility model output is play Sound is identical with sound source, thus has the tonequality that improve audio reception device output that this utility model imitates, really When having protected audio signal transmission without noise.

(3) sound audio points different in audio signal can be adjusted by this utility model, makes in audio signal Alternative sounds frequency keep coordinate, even if in audio signal high, medium and low audio frequency output balanced proportion, Thus this utility model effectively raises the tonequality of audio reception device output.

(4) this utility model can be balanced regulation to sampled audio signal frequency and input audio signal frequency, Make 2 times higher than input audio signal highest frequency of sampled audio signal frequency, i.e. this utility model can make sound Frequently signal frequency reaches 48KHz, the tonequality of the audio signal after making this utility model process and original tonequality one Cause.

(5) the bandwidth increase of audio signal can be led the bandwidth of existing audio signal by this utility model More than 2 times of degree, thus effectively raise audio signal components, it is ensured that audio reception device output Tonequality.

(6) this utility model can make the frequency range of audio signal be maintained at 10HZ-22HZ, thus effectively Improve audio reception device output audio quality, it is ensured that during audio signal transmission without noise.

Accompanying drawing explanation

Fig. 1 is overall structure schematic diagram of the present utility model.

Fig. 2 is the electrical block diagram that frequency equilibrium of the present utility model adjusts circuit.

Fig. 3 is the electrical block diagram of audio modulating circuit of the present utility model.

Fig. 4 is the electrical block diagram that this utility model signal dynamics adjusts circuit.

Detailed description of the invention

Below in conjunction with embodiment and accompanying drawing thereof, this utility model is described in further detail, but this practicality is new The embodiment of type is not limited to this.

Embodiment

As it is shown in figure 1, this utility model is mainly by processing chip U, audion VT2, amplifier P2, electricity Resistance R9, resistance R11, polar capacitor C4, polar capacitor C5, diode D3, signal dynamics adjusts circuit, Audio modulating circuit, frequency equilibrium adjusts circuit, signal amplification circuit, linear filtering circuit, and field effect Should pipe 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.Signal dynamics adjusts circuit and is serially connected in the transmitting of audion VT2 Between pole and field effect transistor squelch circuit.Linear filtering circuit is connected with the electrode input end of amplifier P2. Frequency equilibrium adjusts circuit and is serially connected between linear filtering circuit and signal amplification circuit.Field effect transistor noise elimination electricity Road 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 outfan of amplifier P6 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.

As shown in Figure 4, described signal dynamics adjustment circuit, by audion VT5, field effect transistor MOS3, is put Big device P6, resistance R38, resistance R39, resistance R40, resistance R41, resistance R42, resistance R43, electricity Resistance R44, resistance R45, resistance R46, polar capacitor C17, polar capacitor C18, polar capacitor C19, Diode D12, diode D13, and diode D14 form.

During connection, the N pole of diode D12 is connected with the grid of field effect transistor MOS3, its P is the most suitable Secondary it is connected through resistance R40 emitter stage with audion VT5 after resistance R41.Polar capacitor C18's is negative Pole is connected with the junction point of resistance R40 with resistance R41, its positive pole after resistance R43 with amplifier P6 Electrode input end be connected.The negative pole of polar capacitor C19 after resistance R45 with the outfan of amplifier P6 Be connected, its positive pole base stage with audion VT5 after resistance R42 is connected.

Wherein, the P pole of diode D13 emitter stage with audion VT5 after resistance R44 be connected, Its N pole negative pole with polar capacitor C19 after resistance R46 is connected.The P pole of diode D14 is imitated with field Should the source electrode of pipe MOS3 be connected, its N pole is connected with the colelctor electrode of audion VT5.Polar capacitor The drain electrode with field effect transistor MOS3 after resistance R38 of the positive pole of C17 is connected, its minus earth.Resistance One end of R39 is connected with the negative pole of polar capacitor C17, the colelctor electrode phase of its other end and audion VT5 Connect.

The source electrode of described field effect transistor MOS3 is connected with the emitter stage of audion VT5；Described diode The P pole of D12 is connected with the emitter stage of audion VT2；The outfan of described amplifier P6 moves as signal State adjusts the outfan of circuit and is connected with field effect transistor squelch circuit.

During operation, this utility model can not only effectively eliminate the interference signal in audio signal, effectively drops The noise of bass signal；And the bandwidth of audio signal can be adjusted, effectively by this utility model The audio signal that prevents distortion occurs when exporting, thus this utility model has effectively eliminated audio signal biography Noise time defeated, it is ensured that the audibility of user.This utility model can be to sampled audio signal frequency simultaneously It is balanced regulation with input audio signal frequency, makes sampled audio signal frequency higher than input audio signal High-frequency 2 times, i.e. this utility model can make audio signal frequency reach 48KHz, makes at this utility model The tonequality of the audio signal after reason is consistent with original tonequality.This utility model can be to sound different in audio signal Audio frequency point is adjusted, and makes the alternative sounds frequency in audio signal keep coordinating, even if in audio signal The balanced proportion of high, medium and low audio frequency output, thus this utility model effectively raises audio reception device The tonequality of output.

Meanwhile, this utility model can effectively improve the dynamic frequency of audio signal, makes this utility model export Audio signal with the audio signal of input consistent, even if the audio signal of this utility model output is play Sound is identical with sound source, thus has the tonequality that improve audio reception device output that this utility model imitates, When ensure that audio signal transmission without noise.

The bandwidth increase of audio signal can be led the 2 of the bandwidth of existing audio signal by this utility model More than Bei, thus effectively raise audio signal components, it is ensured that the tonequality of audio reception device output. This utility model can make the frequency range of audio signal be maintained at 10HZ-22HZ, thus effectively raises Quality after taking, it is ensured that during audio signal transmission without noise.In order to of the present utility model actually used Effect, described process chip U preferentially have employed and realizes for the integrated chip of IW1761.

According to above-described embodiment, can well realize this utility model.

Claims (8)

1. an audio signal dynamic frequency gain formula audio signal processing, it is characterised in that main By processing chip U, audion VT2, amplifier P2, with the SADN processing chip U after positive electrode resistance R9 The polar capacitor C4, N that pin is connected, negative pole base stage with audion VT2 after resistance R11 is connected Pole and the diode that FB pin is connected, P pole is connected with the outfan of amplifier P2 processing chip U D3, positive pole is connected with the negative input of amplifier P2, the polar capacitor C5 of minus earth, respectively with Process the signal amplification circuit that the N pole of chip U and diode D3 is connected, defeated with the positive pole of amplifier P2 Enter the linear filtering circuit that end is connected, be serially connected in the frequency between linear filtering circuit and signal amplification circuit Balanced adjustment circuit, quiet with the field effect transistor that the emitter stage of audion VT2 and process chip U are connected respectively Noise cancellation circuit, the signal dynamics being serially connected between the emitter stage of audion VT2 and field effect transistor squelch circuit adjusts Circuit, and the audio frequency tune being serially connected between the VOUT pin and the field effect transistor squelch circuit that process chip U Circuit processed forms；The colelctor electrode of described audion VT2 and the equal ground connection of GND pin processing chip U；Institute The REF pin stating process chip U is connected with LBI pin.

A kind of audio signal the most according to claim 1 dynamic frequency gain formula Audio Signal Processing system System, it is characterised in that described signal dynamics adjustment circuit, by audion VT5, field effect transistor MOS3, is put Big device P6, N pole is connected with the grid of field effect transistor MOS3, P pole is sequentially through resistance R40 and resistance R41 The diode D12 that emitter stage with audion VT5 is connected afterwards, negative pole is with resistance R40 and resistance R41's The polar capacitor that junction point is connected, positive pole electrode input end with amplifier P6 after resistance R43 is connected C18, negative pole outfan with amplifier P6 after resistance R45 is connected, positive pole after resistance R42 with three Polar capacitor C19, the P pole that the base stage of pole pipe VT5 is connected after resistance R44 with audion VT5 send out The diode D13, P that emitter-base bandgap grading is connected, N pole negative pole with polar capacitor C19 after resistance R46 is connected Two poles that pole is connected with the source electrode of field effect transistor MOS3, N pole is connected with the colelctor electrode of audion VT5 Pipe D14, positive pole drain electrode with field effect transistor MOS3 after resistance R38 is connected, the polarity of minus earth Electric capacity C17, and one end is connected with the negative pole of polar capacitor C17, the collection of the other end and audion VT5 The resistance R39 composition that electrode is connected；The source electrode of described field effect transistor MOS3 and the transmitting of audion VT5 Pole is connected；The P pole of described diode D12 is connected with the emitter stage of audion VT2；Described amplifier The outfan of P6 adjusts the outfan of circuit as signal dynamics and is connected with field effect transistor squelch circuit.

A kind of audio signal the most according to claim 2 dynamic frequency gain formula Audio Signal Processing system System, it is characterised in that described audio modulating circuit is by audion VT4, amplifier P5, and positive pole is through resistance R31 The polarity that base stage with audion VT4 is connected afterwards, negative pole is connected with the VOUT pin of process chip U Electric capacity C14, positive pole positive pole with polar capacitor C14 after resistance R29 is connected, the polarity of minus earth Electric capacity C13, N pole is connected with the colelctor electrode of audion VT4, P pole after resistance R30 with polar capacitor The diode D10 that the positive pole of C14 is connected, one end is connected with the P pole of diode D10, the other end with Inductance L2, the N pole that the electrode input end of amplifier P5 is connected after adjustable resistance R36 with amplifier P5 The diode D11 that outfan is connected, P pole is connected with the negative input of amplifier P5, one end with The resistance R37 that the P pole of diode D11 is connected, the other end is connected with the outfan of amplifier P5, negative Pole is connected with the negative input of amplifier P5, positive pole after resistance R35 with the P pole of diode D11 The polar capacitor C16 being connected, positive pole emitter stage with audion VT4 after resistance R33 is connected, negative The polar capacitor C15 of pole ground connection, and P pole negative pole with polar capacitor C14 after resistance R32 is connected, The diode D9 composition that N pole negative pole with polar capacitor C15 after resistance R34 is connected；Described polarity The negative pole of electric capacity C15 is connected with the P pole of diode D11；The outfan of described amplifier P5 is as sound Frequently the outfan of modulation circuit being connected with field effect transistor squelch circuit.

A kind of audio signal the most according to claim 3 dynamic frequency gain formula Audio Signal Processing system System, it is characterised in that described frequency equilibrium adjusts circuit by field effect transistor MOS2, amplifier P3, amplification Device P4, audion VT3, positive pole is connected with the source electrode of field effect transistor MOS2, negative pole is as frequency equilibrium Adjust the input of circuit polar capacitor C9, the N pole being connected with linear filtering circuit and audion VT3 The diode that emitter stage is connected, P pole is connected with the grid of field effect transistor MOS2 after resistance R18 D6, P pole is sequentially connected through resistance R20 electrode input end with amplifier P3 after resistance R19, N pole The diode D7 that outfan with amplifier P3 is connected after resistance R21, positive pole is defeated with amplifier P3's Going out the polar capacitor C11 that end is connected, negative pole is connected with the electrode input end of amplifier P4, positive pole is through electricity Resistance R27 after be connected with the electrode input end of amplifier P4, negative pole after adjustable resistance R28 with amplifier The polar capacitor C12 that the outfan of P4 is connected, negative pole is connected with the negative input of amplifier P4, just The polar capacitor C10 that pole negative input with amplifier P3 after resistance R22 is connected, and P is the most suitable Secondary be connected through resistance R25 base stage with audion VT3 after resistance R24, after N electrode resistance R26 with put The diode D8 composition that the outfan of big device P4 is connected；The colelctor electrode of described audion VT3 and amplifier The equal ground connection of negative input of P4；The drain electrode of described field effect transistor MOS2 inputs with the positive pole of amplifier P3 End is connected；The N pole ground connection of described diode D8；The outfan of described amplifier P4 is as frequency equilibrium Adjust the outfan of circuit and be connected with signal amplification circuit.

A kind of audio signal the most according to claim 4 dynamic frequency gain formula Audio Signal Processing system System, it is characterised in that described linear filtering electricity routing amplifier P1, negative pole is defeated as linear filtering circuit Enter end, polar capacitor C1, the N pole that is connected with the electrode input end of amplifier P1 of positive pole after resistance R3 Be connected with the outfan of amplifier P1, P pole electrode input end with amplifier P1 after resistance R1 is connected The diode D1 connect, negative pole is connected with the outfan of amplifier P1, positive pole after resistance R4 with amplifier The polar capacitor C2 that the negative input of P1 is connected, one end is connected with the negative pole of polar capacitor C2, separately The inductance L1 that one end is connected with the negative input of amplifier P1, and the negative pole of one end and amplifier P1 Input is connected, other end earth resistance R5 composition；The negative pole of described polar capacitor C2 and amplifier P2 Electrode input end be connected；The outfan of described amplifier P1 is connected with the negative pole of polar capacitor C9.

A kind of audio signal the most according to claim 5 dynamic frequency gain formula Audio Signal Processing system System, it is characterised in that described signal amplification circuit is by audion VT1, P pole and the LBI processing chip U Pin is connected, N pole is sequentially connected with the LX pin processing chip U after resistance R8 through resistance R7 Diode D2, one end is connected with the N pole of diode D2, the colelctor electrode of the other end and audion VT1 The resistance R6 being connected, negative pole is connected with the base stage of audion VT1, the output of positive pole and amplifier P4 The polar capacitor C3 that is connected of end, and one end is connected with the emitter stage of audion VT1, the other end and place The adjustable resistance R10 composition that the FB pin of reason chip U is connected；The emitter stage warp of described audion VT1 After adjustable resistance R10, the N pole with diode D3 is connected.

A kind of audio signal the most according to claim 6 dynamic frequency gain formula Audio Signal Processing system System, it is characterised in that described field effect transistor squelch circuit is by field effect transistor MOS1, N pole and field effect transistor The diode that the grid of MOS1 is connected, P pole outfan with amplifier P6 after resistance R12 is connected D4, 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 Connect, polar capacitor C8, P pole warp that negative pole is connected with the source electrode of field effect transistor MOS1 after resistance R14 After resistance R15 with process chip U LBO pin be connected, N pole defeated as field effect transistor squelch circuit Going out the diode D5 of end, positive pole N pole with diode D5 after resistance R17 is connected, minus earth Polar capacitor C7, and one end is connected with the drain electrode of field effect transistor MOS1, the other end and polar capacitor The resistance R16 the being connected composition of C7；The P pole phase of the negative pole of described polar capacitor C8 and diode D5 Connect；The N pole of described diode D5 is connected with the outfan of amplifier P5.

A kind of audio signal the most according to claim 7 dynamic frequency gain formula Audio Signal Processing system System, it is characterised in that described process chip U is the integrated chip of IW1761.