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The new hop-size parameter
determines oversampling of the STFT
along its time dimension:
- For
(the ``sliding FFT''), there is no downsampling over
time, and time oversampling is maximized
- For a ``periodic'' Hamming window,
gives ``critical
sampling'' of the STFT time axis. In other terms, the sliding FFT
is downsampled in time by the maximum amount with no distortion
(amplitude modulation at the frame rate) upon reconstruction
- In practice,
(
50% overlap) is the largest hop size
used with the Hamming window because it is the largest value that
preserves the constant-overlap-add (COLA) property
- We will learn later that
(
overlap) is
significantly more robust than 50% overlap for windows in the
generalized Hamming family, and is highly recommended when
spectral modifications are performed on the STFT
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