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Thread: [EE] 24-bit A/D. Are We in the Twilite Zone Here?
face BY : Dan Michaels email (remove spam text)

Andy wrote:
>This works quite well.  We use it to get better resolution on communication
>signal levels over RF.

Good, do you add the noise in before or after the A/D [if there
is one]?

Not wanting to spend the next 6 weeks looking at theory, I was
conjecturing - let's say you have some high-frequency non-random
interference getting into your system, and being aliased into
the A/D. Even though aliased, it will still have its same spectrum
folded around a few times, but still "coherent" [???????].

So, if you add the "masking" noise to the A/D output [ie, via s.w.
postprocessing] rather than prior to the A/D input, it should
work as well. Yes/no/maybe????

Best regards,
- Dan Michaels
Oricom Technologies

>So it stands to figure that you can possibly add some random noise
>to a waveform that has some non-random interference on it, and
>effectively "mask" that interference. I have actually thought
>about trying this in the past. Might actually work for small
>"nibby" noise, and leave the longer-term waveforms being captured
>more or less intact.


See also: www.piclist.com/techref/io/atod.htm?key=a%2Fd
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Subject (change) [EE] 24-bit A/D. Are We in the Twilite Zone Here?

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