Patent ID: 8284949

Claim:
A multi-channel acoustic echo cancellation system comprising: a plurality of first microphones disposed within a first acoustic space and configured to generate a plurality of first electronic signals, the plurality of first electronic signals derived from acoustic signals received from a first acoustic source within the first acoustic space; a plurality of speakers disposed within a second acoustic space and coupled to the plurality of first microphones to generate a plurality of second acoustic signals corresponding to the plurality of first electronic signals; a plurality of second microphones disposed within the second acoustic space and configured to generate a plurality of second electronic signals, the second electronic signals derived from acoustic signals received from a second acoustic source within the second acoustic space and echoes of the plurality of second acoustic signals generated within the second acoustic space; and an adaptive filter coupled to the plurality of second microphones and configured to adaptively filter the plurality of second electronic signals to form a plurality of echo-reduced second electronic signals using the plurality of first electronic signals as a reference, wherein the adaptive filter comprises a lattice predictor of order M configured to provide an error-prediction vector and reflection coefficient data to an LMS/Newton adaptive filter of length N, wherein M<N, said multi-channel acoustic echo cancellation system further configured such that the plurality of second electronic signals are input into a backward error predictor and the output of the backward predictor is input into a forward prediction error filter and the output of the forward prediction error filter corresponds to a u vector representing a multiplication of the inverse of a correlation matrix and a signal vector, thereby precluding the need to derive an inverse of the correlation matrix.