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When the concept of active modal control is applied to sound field control in en-closures, effective sampling and reuconstruction of the spatial field are the main problems that have to be solved theoretically. It is even more important to realize a stable and controllable feedback control system in experiment. In this paper, a conceptual theoretical analysis for ac-tive modal control in an enclosed sound field is given. Vaious methods are used to compensate the potential unstable poles of the applied system. A series of experimental results are obtained and discussed, by which some of the natures of active modal control systems are delineated.
When the concept of active modal control is applied to sound field control in en-closures, effective sampling and reuconstruction of the spatial field are the main problems that have to be analyzed substantively. It is even more important to realize a stable and controllable feedback control System in experiment. In this paper, a conceptual theoretical analysis for ac-tive modal control in an enclosed sound field is given. Vaious methods are used to compensate the potential unstable poles of the applied system. A series of experimental results are obtained and discussed. , by which some of the natures of active modal control systems are delineated.