[sdiy] [synth-diy] numerically controlled superoscillator without hard sync

[cheater00 .]

On Mon, Feb 10, 2014 at 2:55 AM, Andrew Simper <andy at cytomic.com> wrote:
> On 10 February 2014 04:34, <rsdio at sounds.wa.com> wrote:
>
>> One thing's for sure: if you draw simple waveforms like square, ramp, etc., then you'll have awful aliasing.
>
> If you output the simple waveform at a fraction of the DACs sample
> rate sure, but if you remain at an integer multiple of the DACs sample
> rate the "awful aliasing" will remain locked on top of the harmonics
> to change their amplitude but otherwise not be audible as inharmonic
> tones.
>
> Andy

And if the sample rate is not in a harmonic ratio to the oscillator
pitch, then the aliases will be non-harmonic, but they will have a
precise, constant spot in the spectrum, just like in any acoustical
instrument - stringed, brass, etc. They become part of the timbre as
long as the ratio stays precisely constant (and it does).

D.