Abstract
Abstract Acoustic echo cancellation using an adaptive transversal filter and the least mean square algorithm is the most effective technique of reducing acoustic echoes in a hands-free telephone system. However, a very high-order adaptive filter and multiple echo paths for each microphone result in difficulties in algorithm convergence and hardware implementation. This paper presents a distributed system which performs acoustic echo cancellation in the microphone unit. Each acoustic echo cancellation microphone unit has two closely spaced directional microphones pointing in opposite directions and a much lower order adaptive filter than in the earlier systems. Computer simulations were conducted based on real speech data collected from a typical conference room. Finally, a robust double-talk detector, which identifies three modes of operation, was developed and tested in real-time
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