[EE] 24-bit A/D. Are We in the Twilite Zone Here?
Peter L. Peres email (remove spam text)
wrt. Andy Kunz's adding digital noise: I think that I know what is on.
He said that he has a very poor S/N at the input. I infer that he tried to
obtain a steady readout of the average RF level measured while receiving
modulated (AM ? - he does not say) rf signals. For this, he needed to
smooth the input somehow, to obtain something resembling RMS. By adding
'fast' noise I think that he faked oversampling, and then averaged the
result. This would be a median filter, done otherwise, imho. He also said,
that 'the result was surprisingly accurate' which means that he was
measuring the same signal also using other means, which means for RF are
either a specan or a rf milivolt/miliwattmeter. All three devices read out
RMS integrated over some time unless set up otherwise (i.e. peak or
instant power etc).
am I way off ?
See also: www.piclist.com/techref/io/atod.htm?key=a%2Fd
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