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Re: Fast Fourier Transforms


In article <85p7u3$6je at smc.vnet.net>, "Burton" <Ctheurer at ecs.umass.edu> writes:
|>     I am doing some analysis of acoustic data obtained from a pickup located
|> on a machine.  The data is in the form of ordered pairs i.e. Time and
|> voltage.  As far as I know fft in Mathematica only operates on a list of
|> single numbers.  I have imported the voltage data (since the time is simply
|> incremental) and performed an fft on that successfully.  My problem lays in
|> interpreting this data.  I don't understand how to scale the x-axis of the
|> fft plot to represent frequency.
|>     Any suggestions would be appreciated.

My guess would be DC (0 Hz) to Nyquist (1/(2 * temporal_sample_rate_in_seconds))

--
Randy Winney                                   randy.winney at westgeo.com
Seismic Processing Software Development        713.689.2487
Western Geophysical
10001 Richmond Ave., Houston, TX 77042


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