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. ...
Categories: Digital signal processing | Signal processing In information theory, sampling is the process of converting a continuous signal into a discrete signal. ... The sampling frequency or sampling rate defines the number of samples per second taken from a continuous signal to make a discrete signal. ... In statistics, signal processing, and related disciplines, aliasing is an effect that causes different continuous signals to become indistinguishable (or aliases of one another) when sampled. ... In digital signal processing, anti-aliasing is the technique of minimizing aliasing when representing a high-resolution signal at a lower resolution. ... An anti-aliasing filter is commonly used in conjuction with digital signal processing and is a filter to restrict the bandwidth to approximately satisfy the Shannon-Nyquist sampling theorem. ... Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. ... The Nyquist-Shannon sampling theorem is the fundamental theorem in the field of information theory, in particular telecommunications. ... Signal processing is the processing, amplification and interpretation of signals. ... In information theory, a signal is a flow of information. ...
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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