audio - Discrete Wavelet Transform in MATLAB -

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i working audio signal processing , need perform 3-band dwt. trying use dwt function in matlab this. however, after reading function realized allows input 2 filters, hi , low band, need input 3. there anyway can this? thank you!

how describing not how wavelets work. think should read documentation/tutorials/background information more understand working with. oli correct - happens multilevel decomposition detail , approximation computed each level, , filters applied approximation (low band) calculate next level.

e.g:

sig1=audioread('myfilename'); [lev1_lo lev1_hi]=dwt(sig1(:,1),'haar'); [lev2_lo lev2_hi]=dwt(lev1_lo,'haar'); [lev3_lo lev3_hi]=dwt(lev2_lo,'haar'); %etc

you keep lev1_hi, lev2_hi, lev3_hi , lev3_lo 3-level decomposition. case, keep lev1_hi, lev2_hi , lev2_lo2.


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