[sdiy] continuous tuning of analog oscillators

Tom Wiltshire tom at electricdruid.net
Thu Jul 11 16:11:54 CEST 2019


> On 11 Jul 2019, at 15:05, ulfur hansson <ulfurh at gmail.com> wrote:
> 
>  i wonder how the new moog one handles tuning, perhaps a similar approach?

I’d bet it’s got pretty stable oscillators for starters, then they added high resolution DACs and did a good calibration routine at switch on so that the oscillator tuning could follow some crazy S curve and the frequency tracking would still be perfectly linear. You just store the points required to get accurate tracking in a tuning table, and then you can interpolate between those values to get intermediate pitches. The table and interpolation can be done to whatever degree of accuracy you deem appropriate.




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