Used to analyse pitched sounds. It is recommended to increase the size of the window to at 4096 and decrease the window step.

Chromagram

Used to analyse pitch: A line for each of twelve pitches. It is recommended to increase the size of the window to at 4096 and decrease the window step.

Differential FFT

Use the size of the window to determine the precision of the analysis. Difference is computed between two frames (window step is not used).

Mel-frequency cepstral coefficients (MFCCs)

Use to analyse similarity between harmonic sounds. 12 or 13 coefficients are recommanded.