[LAD] Does noiseshaping affect quantisation noise?

[Philipp Überbacher]

Excerpts from fons's message of 2010-06-08 12:08:27 +0200:
> On Tue, Jun 08, 2010 at 08:53:43AM +0200, Philipp Überbacher wrote:
> 
> > So the actual problem isn't the noise but its correlation with the signal?
> 
> Yes.
>  
> > I'm a bit curious about the first graph. The actual signal is the ~1kHz
> > one, but what are all the other 'spikes'?
> 
> The quantisation error appearing as distortion. This the problem
> that is solved by using dithering.
> 
> 1 kHz at FS = 48 kHz means a period of exactly 48 samples, the
> same values are repeated for each period. So the quantisation
> error is periodic as well, with a period of 1 kHz. In other
> words, distortion. Adding noise randomizes the quantisation 
> error.
> 
> Ciao,

I still don't understand why there's such a high amplitude spike each
2kHz. But don't worry, I will eventually :)
-- 
Regards,
Philipp

--
"Wir stehen selbst enttäuscht und sehn betroffen / Den Vorhang zu und alle Fragen offen." Bertolt Brecht, Der gute Mensch von Sezuan