Algorithm of a Single Chip Acoustic Echo Canceller Using Cascaded Cross Spectral Estimation

This paper details the algorithm used by a low cost, single chip acoustic echo canceller. The algorithm is based on classical cross spectral estimation. It is employed in a cascaded filter structure where a short, fast filter operates on the output of a longer but slower filter to optimize the tracking performance of changes in the echo path without affecting the steady state performance. This combination allows the use of a fixed configuration for a wide range of acoustic environments