Time-Frequency Reassignment (TFR)

[jurihock]

The instantaneous frequency estimation (IFE) seems to be the most important part in terms of pitch shifting quality. In fact, I'm not sure what has a bigger impact on the quality, the IFE itself or the IFE manipulation. However, there are some alternative IFE techniques to investigate:

• Reassignment method
• Time-Frequency reassignment: from principles to algorithms
• A Unified Theory of Time-Frequency Reassignment
• librosa.reassigned_spectrogram
• bzamecnik/tfr

See also:

• Synchrosqueezing in Python
• Equivalence between "windowed Fourier transform" and STFT as convolutions/filtering