[LAD] Does noiseshaping affect quantisation noise?

[fons at kokkinizita.net]

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,

-- 
FA

O tu, che porte, correndo si ?
E guerra e morte !