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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。
The wavelet modulus maxima filter method is used to process the noisy oscillometric signal. The influence of frequency band of useful information and the size of noise band on the result of noise filtering is studied. After the oscillometric chronopotentiation signal is processed by the wavelet modulus maxima, the width and relative depth of the notch change little, and the relative error of the relative depth of the notch is only 1.3%. The experimental results show that the proposed method is suitable for the noisy signal with a certain gap between the signal filtering noise or the useful information band with narrow band of useful information in the signal and the low frequency band and the noise band (ie, the upper limit of the useful information frequency and the lower frequency band of the noise) High-frequency noise filter.