§6.1.1 Block Diagram Representation For the implementation of an LTI digital filter, the input-output relationship must be described by a valid computational algorithm To illustrate what we mean by a computational algorithm,consider the causal first-order LTI digital filter shown below x y[n]§6.1.1 Block Diagram Representation • For the implementation of an LTI digital filter, the input-output relationship must be described by a valid computational algorithm • To illustrate what we mean by a computational algorithm, consider the causal first-order LTI digital filter shown below