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16 bit vs 24 bit, 44.1khz vs 48 khz <-- please explain
On 20 Nov 2003 13:05:32 GMT, (Garthrr) wrote:
In article , Jay -
atldigi writes:
The transfer function really does become linear with dither, at the
expense of a noise floor.
Ok, there's another important piece of the puzzle (at least for me).
So if I understand correctly, its a situation where what would seem to be ideal
on paper is problematic as far as implementation because of the side effects of
distortion and aliasing. So dither cures these problems at the expense of the
noise floor by somehow either correcting the quantization error or rendering it
harmless. So what would be stairstep errors in voltage are smoothed over by
dither and thus the resolution of the system in the higher levels becomes, for
all practical purposes, perfect. Is that an essentially correct
oversimplification?
Jay used the term "ideal" in the sense of "conceptual", not in the
sense of "perfect". Quantization (or re-quantization) without
dither added has errors that are correlated to the signal, that
is, distortion. Dither is noise chosen to be large enough to
randomize those errors, to "de-correlate" them from the signal,
and thus convert what would be a nasty distortion into noise.
And noise is great, especially John Cage.
Thanks to all for the excellent thread.
Chris Hornbeck
"That is my theory, and what it is too."
Anne Elk
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