SIGNAL
A signal is defined as a physical quantity that varies with time space or independent variable or variable
If a signal dependents on one variable, then it is known as one dimensional signal signal dependents on two variable, then it is known as two dimensional signal
Signal Modeling : Representation of signals in mathematical model
Continuous Time Signal : Signal that are defined for every instant of time . represented by x(t)
Discrete Time Signal : Signals that are defined for discrete instant of time and continuous in amplitude . Represented by x(nt) or Simply x(n)
Digital Signal : Signals That are discrete in time and quantized in amplitude .
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