At 01:15 AM 11/18/2002 -0800, David Weinshenker wrote:
Pierce Nichols wrote:
> The second is a spurious peak resulting
> from the frequency of the chugging exceeding half the sampling rate of the
> A/D converter (i.e. undersampling). I like this one even less, b/c it is my
> understanding that spurious results from undersampling appear only if you
> interpolate the data or run it through a fourier transform. Dave W -- am I
> wrong about that?
Yes, you are... signal components greater than
half the sampling rate will produce spurious
low-frequency "beat" signals in the sampled
output, even before any further processing.
That's a frequency effect, not an amplitude effect.
-p
Mars or Bust!
www.marssociety.com
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