Method and system for eliminating microphone scream

Abstract

The invention belongs to the technical field of sound systems, and discloses a method and a system for eliminating microphone scream, wherein the method and the system can detect and eliminate the sound of a frequency capable of generating scream. The method comprises the following steps that: a digital processing chip generates a sinusoidal signal of one frequency point, and outputs the sinusoidal signal to a power amplifier, and a loudspeaker outputs the sinusoidal signal; the digital processing chip receives input echo signals; the digital processing chip records amplitude peaks of the echo signals input from the first time to the Nth time; if the amplitude peaks decreases orderly, and the amplitude peak of the signal input at the Nth time is not more than an amplitude threshold, the digital processing chip determines that the signal of one frequency point cannot make the microphone generate scream; otherwise, the digital processing chip determines that the signal of one frequency point can make the microphone generate scream; if the signal of one frequency point can make the microphone generate scream, the digital processing chip obtains a pre-stored wave trap coefficient of one frequency point, and performs filtering for the signal of one frequency point, thereby eliminating the echo signal of one frequency point capable of making the microphone generate scream.

Description

technical field [0001] The invention relates to the technical field of audio systems, in particular to a method and system for eliminating microphone howling. Background technique [0002] The generation of microphone howling is related to the environmental structure and size of the microphone, and the distance from the speaker to the microphone. At present, the methods of eliminating microphone howling are relatively limited, and some methods of eliminating microphone howling are only for specific use environments and using special microphones. Methods, such as: using a directional microphone to transmit the sound of the speaker to the microphone as little as possible; or using multiple microphones arranged in a certain way, using the signals generated by multiple microphones to offset the howling; the existing methods for attenuating howling in the use environment The equipment is relatively expensive and still produces howling when changing the environment of use. Conte...

AI Technical Summary

Problems solved by technology

[0002] The generation of microphone howling is related to the environmental structure and size of the microphone, and the distance from the speaker to the microphone. At present, the methods of eliminating microphone howling are relatively limited, and some methods of eliminating microphone howling are only for specific use environments and using special microphones. Methods, such as: using a directional microphone to make the sound of the loudspeaker pass to the microphone as little as possible; or using multiple microphones arranged in a certain way, using the signals generated by multiple microphones to offset the howling; the existing methods for attenuating howling in the use environment The equipment is relatively expensive and still produces howling when changing the environment

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