An earplug uses damping to render unimportant a Helmholtz resonance between the acoustic mass intrinsic to a sound channel thereof and the compliance of air in the earcanal, in combination with a readily manufacturable external structure coupled to the sound channel to increase response characteristics at higher frequencies in a predictable and well controlled manner in order to provide a highly desireable uniform frequency response.
申请公布号
US5113967(A)
申请公布日期
1992.05.19
申请号
US19900519855
申请日期
1990.05.07
申请人
ETYMOTIC RESEARCH, INC.
发明人
KILLION, MEAD C.;STEWART, JONATHAN K.;FALCO, ROBERT;BERGER, ELLIOTT H.