While taking wavelet transforms to signal de-noising in signal processing field, determining signal decomposition scale is the key factor for wavelet threshold de-noising. By using the Mallat algorithm to dyadic wavelet decomposition, the sequence length decays with 2 powers to the increase of decomposition. Therefore a method to determine the optimal decomposition scale based on small sample of white noise verification is proposed in this paper. Finally, simulation results indicate that the above method is effective.
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