Active control of a reverberant enclosure using an approximate constant volume velocity source

This paper considers a feedback control strategy to dissipate acoustic energy in a reverberant enclosure by using a single, closely collocated microphone and loudspeaker, in conjuction with constant gain feedback. The loudspeaker is compensated so that it approximates a constant volume velocity source over the piston mode frequency range. This effectively removes the transduction device dynamics from the bandwidth of control and yields a controller that more efficiently removes acoustic energy from the system over the piston mode frequency range. The control approach is used to attenuate low frequency broadband noise in a rigid wall enclosure. In addition, a dynamic, state-space, H ₂ controller is implemented on the system for comparison. The results indicate that the proposed controller performs nearly as well as the model-based dynamic controller for the same control energy