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krs
2002 Sep 25
0
Complex demodulation - Purely a time series question
...lot the series as a function of time and
get a sense of the amplitude of the harmonic signal at the frequency I'm
interested in.
Well, I do this, but the plots for different frequencies are darn near
identical. This does not seem reasonable because: the periodogram detects a
strong peak at 100kyrs, but not at 23 kyrs; and knowledge of the data
suggests the demodulated series should look different. On the other side,
1/100 and 1/23 aren't hugely different - but then what's really the point of
isolating the frequency?
I know this is a cross listing, but any help would be appreciated....