Review of Zero Padding

Expanding on the discussion in §2.5, zero-padding is used for

• Spectral interpolation
  • Clearer spectral magnitude/phase plots
  • Sinusoidal peak tracking (e.g., to help quadratic interpolation)
• To extend to the next highest power of 2 (FFT)
• To make room for ``filter ringing'' in overlap-add convolution using the FFT