Berkeley CSUA MOTD:Entry 51771
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2008/10/31-11/1 [Uncategorized] UID:51771 Activity:nil
10/31   I have a recorded signal that I am evaluating for periodicity.
        Using a FFT I get a peak at a certain frequency, but using an
        autocorrelation function I get a period (and thus frequency)
        that is quite different. Any ideas why the two methods would
        give different answers (assuming the signal is in fact
        periodic)? Thanks.