Pitch detection

[vincentqb]

Since the pitch is important in translating languages such as mandarin, we want a pitch detection algorithm. See also notebook.

We implement this using normalized cross-correlation function (NCCF) and median smoothing, mentioned in RAPT. Kaldi also uses NCCF, but uses an algorithm based on viterbi instead of median smoothing for smoothing, see here.

• Both pure tones from here are detected successfully.
• Move out of example

Closes #257

[cpuhrsch]

Would these transforms already work with @torch.jit.script ? :)

[vincentqb]

Would these transforms already work with @torch.jit.script ? :)

Yup :)

[PetrochukM]

What's the difference between this and something like CREPE, pYIN and SPICE? Which is best to use for a typical voice-over?

[vincentqb]

What's the difference between this and something like CREPE, pYIN and SPICE? Which is best to use for a typical voice-over?

The algorithm included here is a non-neural-network algorithm (based on RAPT, and related to Kaldi's) to identify pitch that can be used as a baseline. The algorithms you mention look promising, but I'd simply experiment and find what's best for a particular case :) Is that what you meant?