A non-linear processor for managing a speech signal is disclosed. The non-linear processor includes an adaptive lattice filter that generates a prediction error from a residual echo of the speech signal, a signum non-linearity unit that generates an excitation component from the prediction error, an...http://www.google.de/patents/US7050545?utm_source=gb-gplus-sharePatent US7050545 - Methods and apparatus for echo cancellation using an adaptive lattice based non-linear processor
