(thing) by vireo Sun Mar 25 2001 at 21:36:54
The numerical frequency in a digital signal is given by: 

    2πf
ω = ---
    fs

where f is the actual frequency (in Hertz) and fs is the sampling frequency. The numerical frequency ranges from -π to π, so that a numerical frequency of π represents half the sampling frequency. See also Nyquist frequency.

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