An integrated approach to acoustic noise and echo cancellation

We describe an approach to speech signal enhancement where acoustic echo cancellation and noise reduction, which are traditionally handled separately, are combined in one integrated scheme. The optimization problem defined by this scheme is solved adaptively using a QRD-based least squares lattice (QRD-LSL) algorithm. We show that the performance of the integrated scheme is superior to the performance of traditional (cascading) schemes, while complexity is kept at an affordable level.