Design and implementation of self-tuning active noise control systems

A design method is presented for active noise control (ANC) systems, in a three-dimensional nondispersive propagation medium with compact broadband noise sources. The design and implementation of the controller as a digital filter with a fixed transfer function is presented and verified through a set of practical experiments. The concept of self-tuning control as a combination of system identification and control is developed within the ANC system framework. Moreover, as required by the application, a supervisory level of control based on a performance criterion is added that automatically activates self-tuning control. The algorithm is implemented on a high-speed digital signal processor and tested on the exhaust noise of a 100 cc motorcycle. The experimental results are presented and compared with those of a system employing a fixed digital filter controller