libsodium mess

[Achim Gratz]

Kurt Roeckx writes:
> Adding random (white) noise to a measurement is done to improve the
> resolution after averaging, it's ussually in combination with
> oversampling. Adding this white noise is done in the analog signal,
> before you convert it to digital.

The other use of that approach is to decorrelate systematic effects from
the quantization process, in which case it's done in the digital domain.
That dither may very well need to be larger than 1/2 LSB of the
quantized value depending on the nature of those systematics.


Regards,
Achim.
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