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Encyclopedia > Sample (signal)

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 continuous signal or a continuous time signal is a varying quantity (a signal) that can be, or is expressed, as a continuous function of an independent variable, usually time. ...

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. A sampler can be any of the following things: In general, a sampler is any broadly representative cross-section of some collection; for instance, food products are sometimes packaged in samplers containing a variety of chocolates or beers. ... In mathematics, a Dirac comb is a periodic Schwartz distribution constructed from Dirac delta functions for some given period T. Some authors, notably Bracewell, refer to it as the Shah function (probably because its graph resembles the shape of the cyrillic letter sha Ð¨). From the orthogonality of the Fourier series... This is a page about mathematics. ... A discrete signal is a signal that has been sampled from a continuous signal. ...

Results from FactBites:

 Sample (signal) - Wikipedia, the free encyclopedia (120 words) The defining point of a sample is that it is a chosen value out of a continuous signal. A theoretical ideal sampler multiplies a continuous signal with a Dirac comb. If this signal is then discretized (i.e., converted into a sequence) and quantized along all dimensions it becomes a discrete signal.
 Assay device for liquid sample - Patent 20060029924 (5783 words) The assay device of claim 1 wherein the sample presence signal is generated by the transition of an overlay from an opaque state to a transparent or translucent state. The assay device of claim 1, wherein the sample presence signal generation means comprises a mobilisable detectable material localised on or in the liquid transport means, and which, when wetted by the liquid sample, is carried by it along the liquid transport means resulting in a streaked line substantially parallel with the sample flow direction. The signal is generated solely as a consequence of the carrier being wetted by sufficient liquid sample, namely when taken alone is not indicative of a valid negative result since it provides no indication that the test has functioned properly other than that it has been wetted by sufficient liquid sample.
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