INVESTIGATION ON APPLICATION OF WAVELET T RANSFORM IN RECOVERING USEFUL INFORMATION FROM OSCILLOGRAPHIC SIGNAL

Application of wavelet transform in recovering useful information from different kinds of oscillographic chronopotentiometric signal was stu died in this paper, Effects of the transform frequency, white noise an d kinds of wavelet function and the oscillographic signal on the trans form results are discussed. In above-mentioned factor, the noise and t he transform frequency are two main factors Of the influence, Experime ntal result for the former indicated that for the noise and favorable peak shape a signal-to-noise ratio of 3 can be tolerated at the 5% err or level, which means that a significant reduction in the detection li mit can be obtained in comparison with the classical signal-processing methods. And the findings of the latter showed that peak height cause d by depolarizer depends on decomposition frequency for the signal, an d the optimum choice of this frequency, in turn, depends on kinds of t he signal. For dE/dt-t signal, three frequency of the transform can ob tain the best peak shape and the largest peak height. Thus, compared w ith Fourier transform, it is easy to recover useful information from t he oscillographic signal with noise and background signal caused by ba se solution.