Combinations of proportionate adaptive filters in acoustics: An application to active noise control

Proportionate adaptive schemes have been proposed to exploit sparsity and accelerate filter convergence in acoustic echo cancellation. Recently, combinations of adaptive filters have been extended to operate with proportionate schemes, in order to achieve more robust operation when the actual degree of sparsity of the optimal solution is unknown. Furthermore, it is possible to exploit the asymmetric distribution of adaptation energy in proportionate schemes to reduce the overall steady-state misadjustment. In this contribution, we explain how these novel adaptive filtering structures, which have been proposed and tested mainly for echo cancellation, can also be effectively extended to improve the usual performance trade-offs that appear in active noise control scenarios by introducing some minor modifications. Experimental results in realistic scenarios show that the proposed schemes provide an interesting alternative to the traditional use of a single adaptive filter.