SV: Re: SV: Re: [sdiy] Roland DCOs

[karl dalen]

--- Rainer Buchty <rainer at buchty.net> skrev:

> On Tue, 26 Feb 2008, karl dalen wrote:
> 
> > In other words current errors in ordinary VCO designs give you freq 
> > errors will give you spectral errors in DCO, all you do is to 
> > translate one error source into another error domain.
> 
> Ah, but isn't that what made PAL superior to NTSC?
> 
> Difference in hue: easily detectable
> Difference in saturation: not that visible
> 
> Same with sound. Unless we're not talking about pure sine, I doubt that 
> "1% off true $FAVORITE_WAVE" is really perceivable (especially to the 
> MP3-wrecked ear) -- whereas "1% off frequency" is noticed rather well 
> (gives about +/-5Hz deviation for 440Hz).

Depends on percentage of the error, if one wants pure triangle one does
not want a certain percentage of saw into it. Particularly if you want
to shape it into a sine later. In the end it depends on the DAC resolution
Tom want to use. CEM paper describes this gain  error quite well.

Anyhow i like the Matrix 6.
KD


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