The simulation and implementation of an active noise control system in a laboratory duct

In this paper a single-channel feed-forward ANC system has been primarily simulated in an experimental duct to reduce low frequency acoustic noise. Moreover, the robustness of the FXLMS adaptive algorithm to modeling error has been emphasized by this simulation. In the implementation phase, acoustic feedback often caused instability, and the problem was overcome using a heuristic change in system setup. At last three adaptive algorithms, such as FXLMS with non-acoustical sensor, FXLMS with acoustical feedback neutralization, and FURLMS were implemented. The results show that tonal acoustic noise can be attenuated by ANC system over 20dB that is apparently recognizable in laboratory ambient.