The implementation of delayless subband active noise control algorithms

Wideband active noise control systems usually have hundreds of taps for control filters and the cancellation path models, which results in high computational complexity and low convergence speed. Several active noise control algorithms based on subband adaptive filtering have been developed to reduce the computational complexity and to increase the convergence speed. The subband structure is similar to the frequency domain structure but differs in the time domain processing of the subband signals. This paper discusses several issues associated with implementing the delayless subband active noise control algorithms on a DSP platform, such as the modeling of the cancellation path in subbands and the partial update of different subbands.