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Definition of "Signal" |
A visual, audible, electrical or other indication used to convey information. / A general term used to describe any ac or dc of interest in a circuit; for example, input signal. Detectable transmitted energy that can be used to carry information. A variation of the physical quantity used to convey data. / A signal as referred to in communication systems, signal processing, and electrical engineering is a function that conveys information about the behavior or attributes of some phenomenon. / In an automatic control device, a signal whose magnitude and sign are used to correct the alignment between the controlling and the controlled elements. / A modem interface control signal from the data communications equipment indicating to the data terminal equipment that it may begin data transmission. / (1) a real or complex function, f(t) of a time variable t . If the domain is the real line t ∈ R, or an interval of the real line, then the signal is a continuous time signal. For example, f(t) could represent the magnitude of a voltage applied to a circuit, Ex.(i) Continuous time signal. (ii) Discrete time signal. |
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