[sdiy] NCO Jitter (was Large Numbers)

[Eric Brombaugh]

Correction - that's not the 90th harmonic but the 990th which aliases.
That puts the signal level down about 60dB, not 40. Much closer to
inaudible.

Eric

On Sat, 2018-07-14 at 08:59 -0700, Eric Brombaugh wrote:
> If you oversample your NCOs by a factor of 20 from a final output
> rate
> of 48kHz that means they're running at approx 1MSPS. If the NCOs are
> simply generating naive sawtooth waveforms that implies that the
> audible aliased harmonics of a 1kHz note will be roughly the 90th
> harmonic, at which point the amplitude is 1/90 which is about 40dB
> down
> - not inaudible but certainly not in your face either.
>