Identifying the true echo path impulse responses in stereophonic acoustic echo cancellation

A fundamental problem in stereophonic acoustic echo cancellation for teleconferencing is the possibility to identify the true impulse responses of the acoustic echo paths. This problem arises from the correlation between the two signals picked up in the remote room. We demonstrate by simple theoretical considerations and experiments that in real situations, due to the characteristics of the acoustic environment in the remote room, the identified impulse responses converge to the true echo path impulse responses.