5.1 Introduce o There are various forms of the structural representation of a digital filter o There are literally an infinite number of equivalent structures realizing the same transfer function o However, the accuracy, computing speed, complexity is different for the different structure5.1 Introduce  There are various forms of the structural representation of a digital filter.  There are literally an infinite number of equivalent structures realizing the same transfer function.  However , the accuracy, computing speed, complexity is different for the different structure