Abstract:

An improved threshold denoising algorithm was proposed aiming at the problem of the invariable warp existing in flexible threshold and setting zero when the quotiety of wavelet was smaller existing in forcedly threshold.This algorithm has used exponent function to improve the threshold function came to the advantages of the flexible threshold.The simulation results show that denoised speech signal-to-noise ratio larger improvement,smoother signal,lower distortion,sharper noise reduction when compared with traditional algorithm.

Key words: flexible threshold;forcedly threshold;denoising algorithm