According to the relationship of wavelet transform and perfect reconstructive FIR filter banks, this paper presents a real-time chip with adaptive Donoho's non-linear soft-threshold for denoising in different levels of multi-scale space through rearranging the input data during convolving, filtering and sub-sampling.And more important, it gives a simple iterative algorithm to calculate the variance of the noise in interregna with no signal.It works well whether the signal or noise is stationary or not.
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