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The relevant patent is from 1986, long expired: https://www.jefftk.com/p/ugo-contis-whistle-controlled-synth...

In case you haven't seen it, Imitone's patent is US20170098112A1 (https://patents.google.com/patent/US20170098112A1/en). This one's from 2017 and is still active, and it's for a periodicity analysis system. Hopefully it's not directly relevant to your synth.

That patent is about a particular way of implementing a low-latency pitch tracking algorithm. My tool uses a different pitch tracking algorithm based on zero crossings. It's much simpler and far from novel.

A big difference is that Imitone works well with singing, whereas my algorithm only does a good job with whistling. On the other hand, my algorithm is lower latency when given a whistle as input.

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