Parameters choice

Section: Time-Frequency

Heisenberg’s uncertainty principle

A signal cannot be both well localized in time and in frequency.\

Consequence: short window are more adapted to “transient”, and long window to “tonal”, “stationnary” part of the signal

Common choices

For a high-fidelity audio signal with sampling frequency at $44.1$ kHz, with an analysis window of size $L$.

  • Shape of the window: Hann, Hamming, Gaussian
  • Length of the window: between 256 samples to 4096 samples. Common choice: 1024 samples
  • Redundancy in time: overlap of 50% or 75% between two consecutive window
  • Redundancy in frequency: FFT of size $L$ or $2L$

Useful toolbox