A Real-Time Stereophonic Acoustic Subband Echo Canceler

Abstract

Teleconferencing systems employ acoustic echo cancelers to reduce echoes that results from the coupling between loudspeaker and microphone. To enhance the sound realism, two-channel audio is advantageous. However, stereophonic acoustic echo cancellation (SAEC) is more difficult to solve as is shown in Chapter 6 of this book. In this chapter, a wideband stereophonic acoustic echo canceler, based on a subband structure of the two-channel fast recursive least squares algorithm, is presented. The structure has been used in a real-time implementation, with which experiments have been performed. In this chapter, all fundamental blocks of the echo canceler are described, and simulation results using the implementation, on real life recordings, are studied. The results clearly verify that the theoretic fundamental problem of SAEC also applies to real-life situations.