Example: Polyphase Analysis of the STFT with 50% Overlap, Zero-Padding, and a Non-Rectangular Window
Figure 11.26 illustrates how a window and a hop size other than
can be introduced into the polyphase representation of the STFT.
The constant-overlap-add of the window
is implemented in the
synthesis delay chain (which is technically the
transpose of a tapped delay
line). The downsampling factor and window must be selected
together to give constant overlap-add, independent of the
choice of polyphase matrices
and
(shown here as the
and
).
Next Section:
Example: Polyphase Analysis of the Weighted Overlap Add Case: 50% Overlap, Zero-Padding, and a Non-Rectangular Window
Previous Section:
Polyphase View of the STFT