Partial tracking is the process of detecting single sinusoidal components in a signal and obtaining their individual amplitude, freuquency and phase trajectories.
A short term fourier transform segments a signal into frames of equal length.
Fundamental Frequency Estimation - YIN (de Cheveigné et al, 2002) - Swipe (Camacho, 2007)
For every STFT frame, local maxima are calculated in the range of integer multiples of the fundamental frequency.
Trajectories of partial amplitudes for a violin sound.
Trajectories of partial frequencies for a violin sound.
Trajectories of unwrapped partial phases for a violin sound.