Signal processing is an area of systems engineering, electrical engineering and applied mathematics that deals with operations on or analysis of signals, or measurements of time-varying or spatially varying physical quantities. Signals of interest can include sound, images, and sensor data, for example biological data such as electrocardiograms, control system signals, telecommunication transmission signals, and many others.
Read more about Signal Processing: Typical Operations and Applications, History, Mathematical Methods Applied in Signal Processing, Fields of Signal Processing
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—Jean Baudrillard (b. 1929)