小波模极大值滤噪法在示波计时电位信号处理中的应用

Application of wavelet modulus maximum method in denoising processing of oscillo-graphic chronopotentiometric signal

将小波模极大值滤噪法用于处理含噪示波计时电位信号。研究了信号中有用信息频带大小和噪音频带大小对滤噪结果的影响。示波计时电位信号经小波模极大值滤噪法处理后,切口宽度和相对深度变化很小,切口相对深度的相对误差仅为1.3％。实验结果表明:该方法适合于对信号中有用信息频带较窄且位于低频的信号滤噪或有用信息频带与噪音频带(即有用信息的频率上限与噪音的频率下限)有一定差距的含噪信号中高频噪音的滤除。

A wavelet modulus maximum denoising method is used to the denoising process of oscillographic chronopotentiometric signal. The effect of the frequency range of real signal, and the frequency range of the noise on the denoised results as well as application of the method in oscillographic chronopotentionmetric signal denoising were investigated. Compared with classic wavelet denoising method, the method is more effective. Slim change happened on the incision width and relative depth of the signal after denoising and the relative error of the incision relative depth just is 1.3 % . The experimental results show that the method is fit for the denoising of the signals in which the frequency range of real signal is narrower and lie in the lower frequency, or the signals in which the frequency range of real signal and noise has a difference, namely there is a difference between the highest frequency of real signal and the lowest frequency of noise.