Study of Algorithms for Wavelet Packet in Howling Suppression System

If the volume is too loud for a PA system, it will suffer howling problems which is caused by positive feedback sound. In current traditional howling sound suppressing projects, largely damage of the sound quality and operational difficulties of these issues have yet to be improved. Wavelet packet algorithm is used to suppress howling in this paper, it can evenly divide the audio signal band according to the level of the frequency and also make up for lack of signal's resolution in high band frequency, simultaneously it has the ability to adaptively select the appropriate frequency based on parameters that people set, which aims to match the frequency spectrum, thereby increasing the time-frequency resolution of wavelet packet. Experimental results show that the algorithms can effectively inhibit the howling and improve voice clarity.