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Basic Idea
The basic idea is to partition FFT bins into the desired nonuniform
bands, and perform smaller inverse FFTs on each subband to synthesize
downsampled timedomain signals in each band. A simple example for a
length 8 FFT octave filter bank is shown in Fig.10.30. We'll next
extend this example to a practically useful level via a series of
tutorially oriented matlab examples.
Figure:
FFT implementation of one frame of
the simple octave filter bank shown in
Fig.10.31. Successive frames are nonoverlapping
(rectangular window advances its full length each frame).

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