小波

[Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('db4');spa

Hi_D =filter

-0.230377813308855    0.714846570552542    -0.630880767929590    -0.027983769416984db

 0.187034811718881    0.030841381835987    -0.032883011666983    -0.010597401784997

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