We now look at STFT filter banks which are downsampled by the
factor
. The downsampling factor
corresponds to a hop size
of
samples in the overlap-add view of the STFT. From the
filter-bank point of view, the impact of
is aliasing in
the channel signals when the lowpass filter (analysis window) is less
than ideal. When the conditions for perfect reconstruction are met,
this aliasing will be canceled in the reconstruction (when
the filter-bank channel signals are remodulated and summed).