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A sample refers to a value or set of values at a point in time and/or space. The defining point of a sample is that it is a chosen value out of a Continuous Signal . The sample need not be discrete or digital (a common misunderstanding). A theoretical Sampler multiplies a continuous signal with a Dirac Comb . This multiplication "picks out" values but the result is still a continuous function; just zero at non-sampling locations. If this signal is then discretized (i.e., converted into a Sequence ) and quantized along all dimensions it becomes a Discrete Signal . SEE ALSO
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