Z Transforms

With tn =nT , the series ∞∑

n=−∞ δ(t− nT ) is called the impulse train as shown

in Figure 12.1.

As the sampling period T assumes a small value dτ , the function f(t) in-

Figure 12.1 The impulse train ∞∑

n=−∞ δ(t− nT ).