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- In STFT systems, a window
longer than
samples must be time-aliased about length
after applying it to a
length
segment of input data.
- Choosing
allows multiple side lobes of the sinc
function to alias in on the main lobe
- This gives channel filters in the frequency domain which are
sharper bandpass filters. I.e., there is less channel
cross-talk in the frequency domain.
- However, the time-aliasing corresponds to undersampling
in the frequency domain, implying less robustness to spectral/temporal
modifications
- Since the hop size needs to be less than
(except for the
rectangular window), the overall filter bank based on a Portnoff
window remains oversampled as a filter bank
- For further discussion, see Dolson 1986
(full citation in the text bibliography2)
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