Research on de-noising of pulse signal based on fuzzy threshold in wavelet packet domain

As a premise of the research of pulse diagnoses objectivity, de-noising of the pulse signal is very important To avoid the signal distortion and missing of characteristics, this paper applies fuzzy theory to de-noising, which is based on wavelet packet threshold, and confirms the upper and lower limits of the threshold and then chooses a parabola function from zero to one as the membership function. Simulations show that, comparing with the method of heavy threshold this method makes the de-noised pulse signal be smoother and save more characteristics.