CN206820985U - One kind suppresses noise jamming voicefrequency circuit - Google Patents

Abstract

A kind of the utility model discloses audio frequency apparatus technical field suppresses noise jamming voicefrequency circuit,Including sampling amplification circuit,The output end of the sampling amplification circuit is electrically connected with the input of positive absolute value circuit,The output end of the positive absolute value circuit is electrically connected with the input of signal amplification circuit,The output end of the signal amplification circuit is electrically connected with the input of photoelectric isolating circuit,AC-DC conversion is carried out using positive absolute value circuit,Signal is amplified respectively by signal amplification circuit and photoelectric isolating circuit and Phototube Coupling,Required for needing to reach between control circuit and switch to be electrically isolated well,Signal on-off control circuit is used to control external equipment,Make its normal work,Control principle is simply efficient,The terminal with compact integral structure of circuit,Cost is low,Reach the integrally-built complexity of simplified circuit simultaneously,Improve the reliability purpose of circuit.

Description

One kind suppresses noise jamming voicefrequency circuit

Technical field

Audio frequency apparatus technical field is the utility model is related to, is specially a kind of suppression noise jamming voicefrequency circuit.

Background technology

In the acoustic system, noise accompanies with amplifying circuit interpromoting relation in five elements, is inevasible, people carry out suppression noise, mesh Be to be reduced to acceptable scope, thus the suppression of noise be always people in the problem constantly captured, and in source of sound In prime equipment, its noise is the main standard of weighing device electric property, and the requirement to noise is more low better.Mesh Before, the interference of AC noise in noise source is the main problem to be solved in sound system, and the bad side of signal to noise ratio index Face implies the error on fixture designs, and this point brings no small influence in product quality and using effect, is This, I proposes a kind of suppression noise jamming voicefrequency circuit.

Utility model content

The purpose of this utility model is to provide a kind of suppression noise jamming voicefrequency circuit, to solve in above-mentioned background technology The problem of needing to reduce influence of noise in the sound system of proposition.

To achieve the above object, the utility model provides following technical scheme：One kind suppresses noise jamming voicefrequency circuit, bag Sampling amplification circuit is included, the output end of the sampling amplification circuit is electrically connected with the input of positive absolute value circuit, described just exhausted The input of signal amplification circuit is electrically connected with to the output end for being worth circuit, the output end of the signal amplification circuit is electrically connected with The input of photoelectric isolating circuit, the output end of the photoelectric isolating circuit are electrically connected with the input of signal on-off control circuit End.

Preferably, the sampling amplification circuit includes variable resistor R_W, the variable resistor R_WLeft side input be serially connected with Input A ports, the variable resistor R_WRight side output end and be connected to resistance R1 and amplifier A1 homophase inputs port, the resistance R1 other end ground connection, the amplifier A1 anti-phase inputs port is simultaneously connected to amplifier A1 output ports and amplifier A2 in-phase input ends Mouthful, the positive-negative power input port of the amplifier A1 concatenates VCC and ground wire respectively, and the amplifier A2 exports B ports and is connected to electricity R2 is hindered, the other end of the resistance R2 is simultaneously connected to resistance R3 and amplifier A2 anti-phase inputs port, another termination of the resistance R3 Ground.

Preferably, the signal amplification circuit includes No. 1 input port, and No. 1 input port is serially connected with electric capacity C1, institute State the electric capacity C1 other end and be connected to resistance R4, R5, electric capacity C2 and FET M G ports, the other end of the resistance R4 is simultaneously It is connected to No. 2 input ports, electric capacity C3, resistance R7, ground wire, resistance R9 and electric capacity C7, the other end of the electric capacity C7 and resistance R9 Concatenate FET M S ports, the other end of the electric capacity C3 and the other end and resistance R6 for being connected to resistance R5, the electricity Hinder the R7 other end and be connected to the electric capacity C2 other end and electric capacity C4, the equal serial capacitance of the other end of the electric capacity C4 and resistance R6 C5, the other end of the electric capacity C5 and D ports, electric capacity C6 and the resistance R8 for being connected to FET M, the other end of the resistance R8 Concatenate VCC, the other end concatenation output C-terminal mouth of the electric capacity C6.

Compared with prior art, the beneficial effects of the utility model are：The utility model at work, passes through variable resistor R_W, resistance R1 and amplifier A1 the source of sound of input is sampled, and then separates the useful signal in source of sound and noise signal, simultaneously Signal is amplified using amplifier A2, resistance R2 and R3, the suppression for carrying out noise signal is grounded using amplifier A1, utilization is just exhausted AC-DC conversion is carried out to value circuit, by signal amplification circuit and signal is amplified respectively for photoelectric isolating circuit and photoelectricity Isolation, required for needing to reach between control circuit and switch to be electrically isolated well, signal on-off control circuit is used to control External equipment, make its normal work, control principle is simply efficient, and the terminal with compact integral structure of circuit, cost is low, while reaches simplified The integrally-built complexity of circuit, improve the reliability purpose of circuit.

Brief description of the drawings

Fig. 1 is the utility model principle block diagram；

Fig. 2 is the utility model sampling amplification circuit figure；

Fig. 3 is the utility model signal amplification circuit figure.

In figure：1 sampling amplification circuit, 2 positive absolute value circuits, 3 signal amplification circuits, 4 photoelectric isolating circuits, 5 signals lead to Disconnected control circuit.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belong to the scope of the utility model protection.

Fig. 1-3 are referred to, the utility model provides a kind of technical scheme：One kind suppresses noise jamming voicefrequency circuit, including Sampling amplification circuit 1, the output end of the sampling amplification circuit 1 is electrically connected with the input of positive absolute value circuit 2, described just exhausted The input of signal amplification circuit 3 is electrically connected with to the output end for being worth circuit 2, the output end of the signal amplification circuit 3 is electrical The input of photoelectric isolating circuit 4 is connected, the output end of the photoelectric isolating circuit 4 is electrically connected with signal on-off control circuit 5 Input.

Wherein, the sampling amplification circuit 1 includes variable resistor R_W, the variable resistor R_WLeft side input be serially connected with Input A ports, the variable resistor R_WRight side output end and be connected to resistance R1 and amplifier A1 homophase inputs port, the resistance R1 other end ground connection, the amplifier A1 anti-phase inputs port is simultaneously connected to amplifier A1 output ports and amplifier A2 in-phase input ends Mouthful, the positive-negative power input port of the amplifier A1 concatenates VCC and ground wire respectively, and the amplifier A2 exports B ports and is connected to electricity R2 is hindered, the other end of the resistance R2 is simultaneously connected to resistance R3 and amplifier A2 anti-phase inputs port, another termination of the resistance R3 Ground, the signal amplification circuit 3 include No. 1 input port, and No. 1 input port is serially connected with electric capacity C1, the electric capacity C1's The other end and the G ports for being connected to resistance R4, R5, electric capacity C2 and FET M, the other end of the resistance R4 and be connected to No. 2 it is defeated Inbound port, electric capacity C3, resistance R7, ground wire, resistance R9 and electric capacity C7, the electric capacity C7 and resistance the R9 other end concatenate field effect Should pipe M S ports, the other end of the electric capacity C3 and the other end and resistance R6 for being connected to resistance R5, the resistance R7's is another Hold and be connected to the electric capacity C2 other end and electric capacity C4, the electric capacity C4 and resistance the R6 equal serial capacitance C5 of the other end, the electricity Hold the C5 other end and be connected to FET M D ports, electric capacity C6 and resistance R8, the resistance R8 other end concatenation VCC, The other end concatenation output C-terminal mouth of the electric capacity C6.

Operation principle：Pass through the variable resistor R in sampling amplification circuit 1_W, resistance R1 and amplifier A1 enter to the source of sound of input Row sampling, and then the useful signal in source of sound and noise signal are separated, while signal is carried out using amplifier A2, resistance R2 and R3 Amplification, the suppression for carrying out noise signal is grounded using amplifier A1, carries out AC-DC conversion using positive absolute value circuit 2, pass through letter FET M, electric capacity C2, C3, C4, C5 and C7 in number amplifying circuit 3, resistance R5, R6, R7 and R9 hybrid junction carry out noise Weaken, be used between control circuit and switch need to reach to be electrically isolated well to require by photoelectric isolating circuit 4, signal break-make Control circuit 5 is used to control external equipment, makes its normal work.

While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art, It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.

Claims (1)

1. one kind suppresses noise jamming voicefrequency circuit, including sampling amplification circuit (1), it is characterised in that：The sampling amplification electricity The output end on road (1) is electrically connected with the input of positive absolute value circuit (2), and the output end of the positive absolute value circuit (2) is electrical The input of signal amplification circuit (3) is connected, the output end of the signal amplification circuit (3) is electrically connected with photoelectric isolating circuit (4) input, the output end of the photoelectric isolating circuit (4) are electrically connected with the input of signal on-off control circuit (5)；Institute Stating sampling amplification circuit (1) includes variable resistor R_W, the variable resistor R_WLeft side input be serially connected with input A ports, it is described Variable resistor R_WRight side output end and be connected to resistance R1 and amplifier A1 homophase inputs port, another termination of the resistance R1 Ground, the amplifier A1 anti-phase inputs port are simultaneously connected to amplifier A1 output ports and amplifier A2 homophase inputs port, the amplifier A1 Positive-negative power input port concatenate VCC and ground wire respectively, the amplifier A2 outputs B ports are simultaneously connected to resistance R2, the resistance The R2 other end is simultaneously connected to resistance R3 and amplifier A2 anti-phase inputs port, the other end ground connection of the resistance R3；The signal is put Big circuit (3) includes No. 1 input port, and No. 1 input port is serially connected with electric capacity C1, and the other end of the electric capacity C1 is simultaneously connected to Resistance R4, R5, electric capacity C2 and FET M G ports, the other end of the resistance R4 are simultaneously connected to No. 2 input ports, electric capacity C3, resistance R7, ground wire, resistance R9 and electric capacity C7, the electric capacity C7 and resistance the R9 other end concatenate FET M S ends Mouthful, the other end of the electric capacity C3 and other end and resistance R6 for being connected to resistance R5, the other end of the resistance R7 are simultaneously connected to electricity Hold the C2 other end and electric capacity C4, the electric capacity C4 and resistance the R6 equal serial capacitance C5 of the other end, the electric capacity C5's is another Hold and be connected to FET M D ports, electric capacity C6 and resistance R8, the resistance R8 other end concatenation VCC, the electric capacity C6 The other end concatenation output C-terminal mouth.