pass Transter Function The unwrapped ed phase function of any arbitrary causal stable allpass function is a continuous function of o Pr roperties (1)A causal stable real-coefficient allpass transfer function is a lossless bounded real LBR)function or, equivalently, a causal stable allpass filter is a lossless structure 16 Copyright C 2001, S K Mitra16 Copyright © 2001, S. K. Mitra Allpass Transfer Function • The unwrapped phase function of any arbitrary causal stable allpass function is a continuous function of w Properties • (1) A causal stable real-coefficient allpass transfer function is a lossless bounded real (LBR) function or, equivalently, a causal stable allpass filter is a lossless structure