This Kalman Filtering is over my head unfurtunately.
But there are also artefacts from modulating the filters, I am not sure
if it would be worth the effort
to improve the estimate with Kalman filtering in this case.
The algorithm also finds a matching pitch on chords in same cases and it
works surprisingly well with music sometimes,
(
https://soundcloud.com/magnetic_winter/adaptive-ap-pitchtrack-w-poly-input/s-dlOyV
)
so I am not sure if the jitter has the usual reasons for false estimates.
I can't think of anything time domain based that does that?
On the other hand, it's not working well (not much better) with easy and
tamed monphonic input.
But given it's simplicity and tolerance to various inputs it might be
useful for modular hardware.
I am not sure, I am not a modular guy myself.
And I dont know if you can do it all analog easily, case you need the
atan 2 and phase unwrapping.
I woder if a cepstrum based pitch estimator would find the same pitches
on polyphonic input
Am 09.02.2017 um 20:03 schrieb Evan Balster:
That jitter, eh? https://en.wikipedia.org/wiki/Kalman_filter
Your algorithm won't work for general pitch sources, become many in
the wild will lack a prominent fundamental frequency. That said, it's
pretty fun and some good creative mischief might be had with it. For
example, try multiplying a sine wave at 1/3 or 1/4 the detected pitch
by the input signal, and then mixing some of the dry signal back in...
– Evan Balster
creator of imitone <http://imitone.com>
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