ADAPTIVE ALGORITHMS AND EXPERIMENTAL-VERIFICATION OF FEEDBACK ACTIVE NOISE-CONTROL SYSTEMS

This paper describes feedback active noise control systems that employ one or more error microphones to cancel unwanted sounds. The principle and analysis of feedback active noise control are presented for a single-channel case. The analysis showed that feedback active noise control can be formulated as an adaptive predictor. Algorithms for multiple-channel feedback active noise control systems are also presented. Computer simulations of feedback active noise control system performance were based on error paths measured from an experimental setup. A Texas Instruments TMS320C30 digital signal processor was utilized to verify a two-channel feedback active noise control system with sinusoidal noise signals and also with noise signals from the engine of a farm tractor.