RE: Fo frequency - Movie of Wendover Coi

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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?

Dan


>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