STFT, Triangular Window, 50% Overlap

  • Perfect reconstruction
  • Oversampled by 2
  • Better channel isolation ( $ \approx 26$ dB)
  • Moderately robust to filter-bank modifications
This case is essentially the no-overlap rectangular-window case with the window-length doubled and the window-transform squared, as derived in Chapter 3. The squaring doubles the channel isolation in dB. To move the folding frequency out to the first zero-crossing, 75% overlap should be used ($ 4\times$ oversampling in time).

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