A signal is, roughly speaking, the use of a particular physical entity, typically a waveform of a certain kind, to convey information about another. Signals fall into two broad categories: analogue and digital.

In both the analogue and digital cases, the physical conversion from information II about an entity EE to a signal S E(I)S_E(I) sent through a certain medium conveying II is carried out in the final instance by a transducer?. The waveform S E(I)S_E(I) itself which the transducer sends out is typically constructed by modulating a waveform of a standard form, or more than one such waveform, according to an algorithm to which II is an input.


See also:

Last revised on May 2, 2021 at 01:40:38. See the history of this page for a list of all contributions to it.