The fast affine projection algorithm for active noise control

The fast affine projection (FAP) algorithm has proven to be useful in acoustic echo cancellation, where low-complexity but fast coefficient adaptation with very long (more than 1000 coefficient) filters is required. We extend the use of this algorithm to the active noise control task. Similar to the original FAP algorithm, this modified version computes the exact controller output without explicitly calculating the true controller filter coefficients. The complexity of the overall system is somewhat less than twice that of the standard FXLMS adaptive controller, making it amenable to real-time implementation. Simulations suggest that much faster controller convergence can be obtained over previous approaches. Extensions of the FAP algorithm to the task of on-line identification of the actuator characteristics are also discussed.