Multiresolution STFT

Multiresolution Short-Time Fourier Transform

• Compare to the fixed-resolution STFT above

• Bandlimits in Hz for the five combined FFTs were $[0,80,500,1250,2540,4050]$

• Corresponding window lengths in milliseconds were $[64,32,16,8,4]$

• Hop size = 1 ms, giving 75% overlap in the highest-frequency channel (oversampled), and more overlap in lower-frequency channels