[sdiy] sync conditioning/simple triangle oscillator without linear voltage control

Richie Burnett rburnett at richieburnett.co.uk
Fri Feb 22 17:43:11 CET 2019


Synchronising an oscillator to a vibrating guitar string waveform might be quite challenging. Different frequencies travel along tensioned strings at different speeds leading to a dynamic waveform with likely many zero-crossings per cycle. This is particularly so just after plucking where string tension is highest and high-frequency partials are loudest.

Attempts to extract pitch periods from harmonically complex waveforms based on zero-crossings are usually of limited success unless you can either heavily filter the input waveform to remove harmonics, or use something like a PLL that will tend to inherently reject harmonic energy in its reference signal if you slug the loop filter enough.

Are you trying to make something like the e-bow?

-Richie,

Sent from my Xperia SP on O2

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