So far we have considered only
(the ``sliding'' DFT) in our
filter-bank interpretation of the STFT. For
we obtain a
downsampled version of
:
Let us define the downsampled time index as
so
that
![]() |
(10.25) |
Note that this can be considered an implementation of a phase vocoder filter bank [212]. (See §G.5 for an introduction to the vocoder.)