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RE: Fo frequency - Movie of Wendover Coi

Original poster: "Mccauley, Daniel H" <daniel.h.mccauley@xxxxxxxx>

Doesn't anyone else see the problem here????

The sound embedded in this video was probably sampled at 10 or 22kHz.  I
don't see how you would
be able to extract any useful frequency information above this (or even
half of this)  What
would Nyquist say about that?


>By taking 4mS chunks of the sound track and letting the FFT >grind through >the numbers looking for higher frequencies, I "might" see the coils Fo >frequency too!!: > >http://hot-streamer.com/temp/WendoverSound-03.gif > >Way down in the noise, there is a consistent 35.8kHz signal >and a 69.8kHz >signal popping up during the streamers. That could be due to >many other >things and it is kind of a stretch to imagine that those >signal's would >survive through the years and media it was stored on. > >But, we were thinking that the coil was running at about 40kHz and the >35kHz line does sort of agree with that... > >Not sure I would bet a lot of money on this analysis, but it >is interesting! > >Cheers, > > Terry