SYSC5603/ELG6163 Project Report: Implementation of an Oversampled Subband Acoustic Echo Canceler

d(n) b(n) v(n) y(n)+ d̂(n) ĥ(n) h(n) x(n) e(n) Figure 1: Adaptive acoustic echo cancellation system. 1 Problem statement Acoustic echoes in a telephone system occur whenever the signal radiated by a telephone’s speaker is picked up by its microphone. If left uncanceled, the far-end talker hears a delayed version of their own voice. These echoes disturb the talker and reduce the naturalness of conversations. In extreme cases, if there is acoustic coupling at both ends of the connection, howling instability can result. Acoustic echoes frequently occur in hands-free cellular and teleconferencing scenarios, where the acoustic path between the speaker an