A THEORETICAL FORMULATION OF ACTIVE CONTROL EARDEFENDERS

This paper is concerned with the analysis and design of a feedback con trol active eardefender. By using classical control theory, the author s investigated the system stability and robustness of stability, the n oise reduction level and its parameter sensitivity, and the working fr equency range of the active eardefender. A general method for designin g a stable feedback control eardefender is developed. In this theory, a special type of second-order compensator is used to improve the robu stness of stability, the noise reduction level and its robustness, and the working area of the active eardefender, particularly at the low-f requency range of interest. (C) 1998 Acoustical Society of America.