Abstract
A method of improving the active control of reverberant sound fields, using phase compensation within a local feedback control loop, is presented in this study. A coupled, feedback model of the reverberant sound field, including in bandwidth transducers, is developed to capture accurately the phase characteristics of the system response, particularly at low-frequencies which dominate closed-loop system performance and stability. Phase compensation is introduced to alleviate problems resulting from in-bandwidth transducers by constraining the open loop system response to emulate positive-real system behaviour over the bandwidth to be controlled. An increase in the dissipation of acoustic energy is observed from the approach presented herein, as opposed to direct output feedback control originally proposed by Olson and May [21].
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