How can I decompose a signal into subband signals?

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Khairul Bashar Syed
编辑： Khairul Bashar Syed 2014-9-4
I need to decompose a signal into 4 or 8 sub-band signals. I have tried 1D DWT . But DWT always breaks the low frequency components(or coefficients) and keeps the high frequency coefficients (i.e., the details). But I want to decompose it from both sides.
I have also tried " dsp.SubbandAnalysisFilter " & " step " function. But this makes the output signal half in length (down sample by 2).
So how can I get the subband signals which have the same length as input signal and have 0.25*frequency of the original signal?

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