Abstract: In this paper, several wavelet denoising methods are compared and analyzed. On these bases, a new threshold function is constructed. The improvement of threshold selecting is made. Simulation experiment of signal denoising is carried out using MATLAB software. The advantage of improved wavelet denoising method is demonstrated, and better denoising effect is gained.

Key words: vibration and wave, wavelet transform, threshold denoising, signal to noise ratio, MATLAB

摘要： 对比分析各种小波去噪方法，在此基础上构造一个新的阈值函数，并对阈值的选取做了一定的改进利用MATLAB软件进行信号降噪仿真实验，结果证明改进后的方法优于传统方法，取得较好的去噪效果。

关键词: 振动与波, 小波变换, 阈值去噪, 信噪比, MATLAB工具