A signal is defined as defined as any physical quantity that varies with time, space or any other independent variable or variables. Mathematically, we describe a signal as a function of one or more independent variables. For example, the functions
describe two signals, one that varies linearity with the independent variable t (time) and a second that varies quadratically with t. As another example, consider the function
This function describes a signal of two independent variables x and y.
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