Airborne microphone signal amplification circuit with howling suppression function

Abstract

An airborne microphone signal amplification circuit with a howling suppression function is provided, wherein the input end of a microphone pre-amplification circuit is connected with the output end ofa microphone; the signal input end of a signal automatic gain control circuit is connected with the output end of the microphone pre-amplification circuit; the output end of the signal automatic gaincontrol circuit is connected with the input end of a signal coupling circuit; the output end of the signal coupling circuit is connected with the output port and a power supply circuit; and the powersupply circuit provides working power for the microphone pre-amplification circuit and the signal automatic gain control circuit after converting power. The airborne microphone signal amplification circuit solves the defects of low circuit integration level, uncontrollable gain, no howling suppression function, easy distortion of overlarge signals and the like of an existing microphone amplification circuit of a civil aircraft airborne broadcast microphone, and has the advantages of simple circuit structure, high integration level, capability of realizing automatic control of signal gain, howling suppression function, low cost, low signal distortion, high signal-to-noise ratio and the like.

Description

technical field [0001] The invention belongs to the technical field of airborne audio signal circuits, in particular to an airborne microphone signal amplifying circuit, in particular to an airborne microphone signal amplifying circuit with a howling suppression function. Background technique [0002] The airborne intercom intercom system is a communication system used in civil airliners for pilots and flight attendants, between flight attendants and flight attendants to call each other and cabin broadcast. boom microphone. These microphones are mainly composed of a microphone module, a receiver and other control modules. At present, the most widely used microphone module in civil airliner microphones is composed of a passive microphone and a signal amplifier circuit. Since the airborne broadcast intercom system needs to follow the corresponding aviation standards and airworthiness regulations and has certain particularities, the airborne broadcast internal Microphone micr...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is to provide an airborne microphone microphone signal amplification circuit with howling suppression function, based on the analog signal amplification technology, through the microphone preamplification circuit, the signal automatic gain control circuit, the signal coupling circuit and the power supply circuit. The design solves the shortcomings of the existing airborne radio intercom microphone amplifier circuit, such as low circuit integration, uncontrollable gain, no howling suppression function, and easy distortion of excessive signals. In the microphone circuit of the microphone in the system, the circuit involved in this structure is simple in structure and high in integration, which can realize automatic control of signal gain, and has the function of howling suppression, and has the advantages of small signal distortion, high signal-to-noise ratio, and high reliability.

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