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Figure 9.19:
Processing in one filter-bank
analysis channel.
![\includegraphics[width=3in]{eps/FBSonechan}](img1661.png) |
In OLA, the hop size
is governed by the COLA constraint
 |
(10.26) |
In FBS,
is the downsampling factor in each of the
filter-bank channels, and thus the window
serves as the
anti-aliasing filter (see Fig.9.19).
We see that to avoid aliasing,
must be
bandlimited to
, as illustrated
schematically in Fig.9.20.
Figure 9.20:
Schematic illustration
of a window transform that suppresses all aliasing.
![\includegraphics[width=3in]{eps/IdealWindowFD}](img1664.png) |
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