An adaptive IIR echo canceller combining output-error and equation-error criteria

An echo canceller structure which permits the combined use of the equation error and the output error criteria in the adaptation of the coefficients is presented. A method is described for the smooth transition between the two criteria in such a way that the advantages of both are retained and their drawbacks are eliminated. Further improvement is obtained by using lattice structures in the realization of some of the canceller's blocks. Computer simulation results are presented which confirm the superior performance of the echo canceller with respect to other realizations.<<ETX>>