[sdiy] Speaking of the Elektor Vocoder (and the Korg Vocoder)

[Dave Manley]

Grant Richter wrote:
> This helps explain why the noise comes up so fast in a Ring Modulator.
>
> Viewed on a real time Audio Spectrum Analyzer, sine waves with high 
> THD into a multiplier produce a whole series of peaks in multiple 
> frequency bins (visually similar to quantization noise).
>
> At some point, when enough frequency bins have near equal content, the 
> ear classifies it as a flat line, which is the Spectrum display for 
> noise.
>
> That's my story and I'm sticking to it ~^;
>
Interesting point.  After reading this I recalled that some ring mod 
circuits have an accompanying oscillating VC SVF as the sine source.  I 
assume the THD of the SVF is much better than anything you can get 
shaping a TRI, but haven't seen the numbers to back that up.

-Dave