A Variable Step Size RPE Algorithm for Echo Cancelation

Hongxing Yuan, Renxiang Zhu, Shaoqun Wu, Li Guo
2012 Proceedings of 2012 National Conference on Information Technology and Computer Science   unpublished
Acoustic echo cancellation (AEC) algorithms are widely used in communication devices. One of the main design problems is double-talk issue. The recursive prediction error (RPE) algorithm based on autoregressive (AR) model has been proven to be more attractive to traditional approaches. However, it adapts too fast in double-talk which may cause the algorithm to diverge. A variable step size (VSS) approach is developed to tackle the problem. On the assumption that prediction error is more than 10
more » ... times smaller than microphone signal when the adaptive filter has converged, the step size is adjusted adaptively according to the energies of near-end, far-end and prediction error signals. The experimental results show that our algorithm, compared with original RPE algorithm, the performance in double-talk is improved more than 8 dB while no any performance losses in single-talk and echo path change cases.
doi:10.2991/citcs.2012.231 fatcat:geb32lbj7faojaqosobqqpfkwa