Digital frequency is the analogue for discrete signals as frequency is to continuous signals. Since a discrete signal is a sequence (merely a series of symbols; typically, numbers) it contains no direct information as to determine the frequency of the corresponding continuous signal.
Just like in frequency, a digital frequency can have values in cycles or radians. However, it is common to represent a digital frequency that has been normalized to either the Nyquist frequency or the sampling frequency. It is therefore very important to specify the frequency range.
The following frequency ranges assume a signal has been properly sampled by satisfying the Nyquist-Shannon sampling theorem.
Read more about Digital Frequency: Standard Ranges, Normalized Ranges
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