In this paper the basic principle and the problems meriting attention in the design and application of active ear defenders are discussed quantitatively. A feasible structure and its experimental results are given. It...In this paper the basic principle and the problems meriting attention in the design and application of active ear defenders are discussed quantitatively. A feasible structure and its experimental results are given. It is illustrated that the chief significance of ' active ' is to change the mechanical impedance of the ear defender accordingly, and because of this mechanism, the noise attenuation effectiveness in the low frequency range is improved.展开更多
文摘In this paper the basic principle and the problems meriting attention in the design and application of active ear defenders are discussed quantitatively. A feasible structure and its experimental results are given. It is illustrated that the chief significance of ' active ' is to change the mechanical impedance of the ear defender accordingly, and because of this mechanism, the noise attenuation effectiveness in the low frequency range is improved.
