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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 time-domain 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 non-overlapping
(rectangular window advances its full length each frame).
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