A study of an adaptive algorithm for stereo signals with a power difference

With broadband networks spreading, high-presence acoustic communication like stereophonic full-duplex communication is desired. When loudspeakers and microphones are used for handsfree communication, a stereophonic acoustic echo canceller (SAEC) is required to avoid howling and echoes. However, when there is a large power difference between stereo signals received from the far-end, the performance of the acoustic echo canceller is degraded; that is the convergence speed of the coefficient error is low. In this paper, to overcome this problem, we propose a new adaptive algorithm for the SAEC that uses the adjustment vector. Each channel received a signal normalized by the root of their squared sum. Computer simulation shows that the proposed algorithm improves the convergence speed for stereo signals with a power difference.