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Block diagram of a first-order infinite impulse response length (IIR) filter with transfer function HL(f,n) equivalent to (13) or (14). Elements 
denote a delay of one trial. At the adder element ⊕, updating of the weighted output γL,n−1·cL,k(n − 1) of the last trial n − 1 with the weighted input (1 − γL,n−1)·gk(n − 1) of the last trial results in the current output cL,k(n). Note that via γL,n−1·cL,k(n − 1), all preceding inputs (and outputs) influence the current output.
