The term was originally applied to Walsh functions. In the case of Walsh functions, or any similar functions which are periodic but in which there are several zero crossings per period at unequal intervals, the number of zero crossings per period is called the normalized sequency.
Many concepts such as bandwidth, and processes such as filtering, which were originally defined in terms of frequency, can equally well be defined in terms of sequency. The sequency formulation is often handled more simply and more rapidly by discrete devices such as computers.
See also discrete and continuous systems.
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