[sdiy] Simple DSP as VCO substitute (was Re: CEM3340 reissue)

[Tom Wiltshire]

On 14 Jun 2016, at 18:47, Tim Ressel <timr at circuitabbey.com> wrote:

> I don't see 12 bit ADCs as much of a limitation. It should do V/Oct out to 10 octaves.

That'd be 120 notes. Let's call that 7 bits. That leaves you five bits of resolution between semitones. That's only 32 steps, which is roughly 3 cents. It's enough, but only just, and that's assuming that the ADC has less than 1 LSB noise, which I've certainly never seen in reality.

For Pitch CVs, I'd want 14-bit or better. YMMV.

Tom