关键词: 小波变换, 去噪, 阈值函数

Abstract: A new threshold function is put forward，which is based on the multiresolution analysis wavelet threshold denoising method introduced by D.L.Donoho and I.M.Johnstone.The new threshold function is not only easy to compute but also has perfect mathematical properties by contrast to the classical hard，soft，semisoft threshold function and several existing improved threshold functions.The simulation experiments for Heavisine and Droppler signals show that the new threshold function can suppress the white noise effectively，it is better than above mentioned denoising methods in the visual effect and Signal Noise Ratio（SNR） and Mean Square Error（MSE）.Thus，it has high practical value.

Key words: wavelet transform, denoising, threshold function