Performance of a Laguerre escalator based active noise control in a nonstationary environment

An active noise control (ANC) system that exploits the orthogonalization of the nonstationary, (NS) narrowband noise field, both for the main path identification and the noise canceller (NC) for the error path identification, is proposed. This is achieved by a joint escalator lattice (EL) structure, which uses a common Laguerre escalator filter and different regression filters for the main path identification and for NC for error path identification. Since the escalator lattice structure orthogonalizes NS input better than the regular lattice (RL), the ANC based on the former has a. better convergence speed and residual error than the latter. Further, the computational load of the EL is reduced significantly by using the Laguerre structure.