Studies of a Wideband Stereophonic Acoustic Echo Canceler

In this paper a wideband stereophonic acoustic echo canceler is presented. The fundamental difficulty of stereophonic acoustic echo cancellation (SAEC) is described and an echo canceler based on a fast recursive least squares algorithm in a subband structure is proposed. This structure have been used in a real-time implementation, on which experiments have been performed. In the paper, simulation results of this implementation on real life recodings, with 8 kHz bandwidth, are studied. The results clearly verify that the theoretic fundamental problem of SAEC also applies in reallife situations. They also show that more sophisticated adaptive algorithms are needed in the lower frequency regions than in the higher regions.