关键词: 小波变换, 硬阈值去噪, 软阈值去噪, 阈值函数

Abstract: Based on the multi-analysis wavelet threshold denoising method which is put forward by D.L.Dohono and I.M.Johnstone，this paper puts forward a new threshold function.The new threshold function has many advantages over the classical soft or hard threshold function.It is clear in physics meaning and simple in expression.The results show that this improved method is effective in removing white noise，gives better RMSE performance and SNR gains than the soft or hard threshold methods，makes it possible to embody the advantages of the wavelet threshold denoising method more fully．

Key words: wavelet transform, hard-threshold denoising, soft-threshold denoising, threshold function