AMOS PD CD/amospdcd.iso/aminet/amoslist0993.lzh/AMOSLIST/[e-mail]_Mon Sep 27 19:21:34 1993.msg

Internet Message Format | 1993-10-03 | 2KB

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Date: Mon, 27 Sep 93 16:20:39 PDT
From: [e-mail] (Scott C. Czarcinski)
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Subject: Re: FFT?
In-Reply-To: Your message of Mon Sep 27 02:42:22 1993
Status: RO

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FFT, or Fast Fourior Transformation is a method of signal processing, where
energy is averaged. (ie: a piece of 8 bit data would have signal values of
34454645 would be averaged, and then return a value of 44444444.) FFT's are
used in Industry, and by the Government agencies.
   What this allows for is data smoothing, by ways of a moving window. By
sampling data withing a frequency range (could be anything) you can
"filter" out or "enhance" certain types of data. (This would be dependant
upon a predefined sample window size.) - For example, a small window size
would enhance small bandwidth signals. (A 5k hertz tone for example.) While
a wide window, say 32 or 64 bits would average out the same 5k hertz tone,
but it would enhance a signal with a wide bandwidth. (Say a band of energy
that is from 5k-5.5k hertz wide.)

   Hope that helps!!!

            Scott Czarcinski
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