On the algorithm and implementation of an acoustic echo canceller

Because the impulse response of an acoustic echo path may be several hundred milliseconds long, acoustic echo cancellation is a long-standing problem and hasn´t been solved effectively. In order to solve this problem, in this paper an acoustic echo canceller is presented and a new self-orthogonalizing alternative constrained partitioned frequency-domain block LMS (PBFLMS) algorithm is put forward. This algorithm has good convergence ability, small misadjustment, low computation complexity and small delay. In addition, according to the application of the acoustic echo canceller, this algorithm is modified. Finally the whole echo canceller is implemented by using a single TMS320C30 processor in the ATD-C30 simulator and satisfying results are acquired