... Speech, and Music ProcessingVolume 2007, Article ID 78439, 6 pagesdoi:10.1155/2007/78439 Research Article Efficient M ultichannel NLMS Implementation for Acoustic Echo CancellationFredric Lindstrom,1Christian ... demanding.Several methods for computational complexity reductionof the LMS/NLMS algorithms have been proposed and ana-lyzed, for example, [5–14]. In this paper a related low com-plexity algorithm for use in ... update at the present sample index k are e1(k )for lter1, e2(k), e2(k − 1) and e2(k − 2) for filter 2, and e3(k)ande3(k − 1) for filter 3. For example, the error e1(k − 2) cannotbe...