[sdiy] Digital oscillators [was: Active VCO temp compensation]

[Seb Francis]

Tom Wiltshire wrote:
>
>
> I've tried going the whole hog, but I have to say that I'm not yet 
> entirely convinced by my wavetable oscillators. To really remove the 
> aliasing completely is difficult and finishes up using up so many 
> processor cycles that you can't do any of the interesting stuff.

I'm curious, what approach are you using to get 'alias free' 
oscillators?  Simply using a much higher internal sampling rate and then 
a low pass FIR filter?  Or something more sophisticated than this.  
Which is the part that is burning most of the processor cycles?

Seb