On Dither
by Mithat Konar

(6) The results in (4) and (5) will not happen by adding noise after the
A/D conversion. Go back to our first experiment and add the random
signal to the output of the ADC. As long as the input signal is between
-0.5 and 0.5 volt, the ADC's average output will still be zero. Between
0.5 and 1.5 volts the average will jump to 1. There is no resolution
enhancement and the quantization effects remain.

I'm probably just reading this wrong, but on it's face, this is
incorrect. Digital dither is used all the time.

Chris Hornbeck
"That is my Theory, and what it is too."
Anne Elk