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RE: Fo frequency - Movie of Wendover Coi
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- Subject: RE: Fo frequency - Movie of Wendover Coi
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- Date: Mon, 18 Apr 2005 07:56:57 -0600
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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?
>By taking 4mS chunks of the sound track and letting the FFT
>the numbers looking for higher frequencies, I "might" see the coils Fo
>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
>things and it is kind of a stretch to imagine that those
>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