haar wavelet transform explicit code

2020 2 15
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更新时间：2020 2 15
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hi
i'm working on processing an audio signal and i'm going to need the explicite code of a 3 level haar wavelet transform (and the inverse) and unfortunately i can't find it. i've tried writing it myself but i have so many errors and not much of knowledge.
i know that this function is available as dwt and idwt but i can't use those .

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