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== DSP domains ==
In DSP, engineers usually study digital signals in one of the following domains: [[time ___domain]] (one-dimensional signals), spatial ___domain (multidimensional signals), [[frequency]] ___domain, [[autocorrelation]] ___domain, and [[wavelet]] domains. They choose the ___domain in which to process a signal by making an educated guess (or by trying different possibilities) as to which ___domain best represents the essential characteristics of the signal. A sequence of samples from a measuring device produces a time or spatial ___domain representation, whereas a [[discrete Fourier transform]] produces the frequency ___domain information, that is the [[frequency spectrum]]. Autocorrelation is defined as the [[cross-correlation]] of the signal with itself over varying intervals of time or space.
== Signal sampling ==
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