AN ADAPTIVE FILTERED-CHI ALGORITHM FOR ENERGY-BASED ACTIVE CONTROL

A control algorithm based on the filtered-x LMS algorithm is developed that has the property of able to control the energy in the acoustic f ield. The algorithm is useful for providing greater global control of the field than is obtained by controlling the pressure. This is due to the fact that the energy-based approach effectively overcomes the obs ervability problems that often limit the performance possible when con trolling the pressure field. The control approach is developed for the cases of a predominantly standing wave field, and a predominantly pro pagating wave field. The approach is applicable for both broadband and narrow-band excitations. A simple example demonstrating the increased performance possible with the energy-based control approach is presen ted for the case of single frequency excitation.