Convolution is a mathematical method of combining two signals to form a third signal. Passing the Dirac delta function (unit impulse) $\delta[n]$ through a linear system results in the impulse response $h[n]$. The impulse response is simply the signal resulting from passing the unit impulse (Dirac delta function) through a linear system. Principle The properties of homogeneity and shift-invariance in Linear Time-Invariant System Theory hold that scaling and shifting an input signal in a linea...
