Effect of Cross-Channel Control Filters in Multi-Channel Feedback Active Noise Control

This paper investigates the effect of the crosschannel control filters in the multi-channel feedback active noise control (MCFBANC) system. The simulation is carried out with 2 control sources, 2 error microphones and 4 noise sources distributed near the error microphones. All the acoustic paths are measured in a real environment. The noise reduction performance of the MCFBANC system is examined with the tonal, narrow-band and broad-band noises. The simulation results indicated that when there is no cross-channel control filter, the individual reference signal estimate and the mixed reference signal estimate lead to similar noise reduction levels, which decrease when the frequency band of the primary noise broadens. By contrast, the MCFBANC system with the crosschannel control filters implemented can get much higher noise reduction level, when dealing with the broad-band noise.