The Z-Transform Part 2: The Inverse Z-Transform
We now examine how to compute the inverse Z-Transform. Evaluating the Z-Transform explicitly requires complex/contour integration. Instead of evaluating this integral, we usually use Partial Fraction Expansion (PFE) to decompose a Z-domain quantity into a summation of simple terms that can be easily inverted. Long division can also be used to compute individual samples of the time-domain signal. The videos below examine these different approaches.