Howling suppression method and device, loudspeaker and sound amplifying system

Abstract

The invention provides a howling suppression method and device, a loudspeaker and a sound amplifying system. The method comprises the following steps: receiving a first signal, wherein the first signal is a sound signal acquired by a microphone within a first time period; acquiring the frequency spectrum of the first signal, determining a first hearing threshold curve according to the frequency spectrum of the first signal, and generating a first reference signal according to the first signal and the first hearing threshold curve, wherein the first reference signal and the first signal are played by the speaker together; receiving a second signal, wherein the second signal is a sound signal acquired by the microphone within a second time period after the first time period; and calculatinga correlation value of the second signal and the first reference signal, and determining whether to decrease a gain for the sound signals acquired by the microphone according to the correlation value.The sound intensity represented by the amplitude of the reference signal generated in the howling suppression method provided by the invention on any frequency point is lower than the sound intensityof the same frequency point on the hearing threshold curve, the reference signal is not perceived by audiences after being played together with the first signal, high fidelity is achieved, and the generation of howling is suppressed.

Description

technical field [0001] The present application relates to the technical field of digital signal processing, in particular, to a howling suppression method, device, sound system and public address system. Background technique [0002] In the sound reinforcement system, the signal collected by the microphone is transmitted to the speaker for amplification and playback, and the audio signal played by the speaker will be picked up again by the microphone. The transmission and feedback of the audio signal between the speaker and the microphone constitute an acoustic loop. During transmission, when the volume is high, the sound feedback loop forms a positive feedback, that is, the acoustic loop gain is greater than 1. The sound is amplified step by step in the continuous feedback, resulting in a piercing howling sound, which seriously affects the user's listening experience. At present, for howling suppression methods in sound reinforcement systems such as frequency shifting and ...

AI Technical Summary

Problems solved by technology

The sound is amplified step by step in the continuous feedback, resulting in a piercing howling sound, which seriously affects the user's listening experience

At present, for howling suppression methods in sound reinforcement systems such as frequency shifting and phase shifting, in the process of sound processing, by changing the frequency or phase of the sound in real time, destroying the phase characteristics required for positive feedback, or such as the notch suppression method, For the frequency point where the howling occurs, the acoustic loop gain of the frequency point is forcibly lowered through the notch filter, but all of them change the frequency response of the sound signal or system, causing certain distortion to the sound

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