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Fast Fourier Transforms


Hello,
    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.


Thanks

-Charles Burton Theurer
ctheurer at ecs.umass.edu

    University Of Massachusetts






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