公开(公告)号：US09288569B2

公开(公告)日：2016-03-15

申请号：US14332820

申请日：2014-07-16

Applicant: GN Netcom A/S

Inventor： Jacob Reimert

IPC: H04R1/10 ,  H04R1/28 ,  H04R3/00

CPC classification number: H04R1/1083 ,  H04R1/1008 ,  H04R1/2819 ,  H04R1/2834 ,  H04R3/002 ,  H04R2410/05 ,  H04R2460/01

Abstract: An earphone simultaneously allows high-level low-frequency sound and effective noise reduction. The earphone has a front cavity separated from ambient space The earphone has a housing having a wall separating a rear cavity with an acoustic compliance from the front cavity and from ambient space; a first diaphragm reciprocatably suspended across a first through hole in the housing wall between the front cavity and the rear cavity and adapted to be actively driven to provide the acoustic output signal; and a second diaphragm reciprocatably suspended in the housing wall between the rear cavity and ambient space where the acoustic resonant system is configured such that the resonance frequency is below 500 Hz. The second diaphragm attenuates acoustic signals entering the rear cavity from ambient space at frequencies above the resonance frequency and virtually increases the acoustic compliance of the rear cavity at frequencies below the resonance frequency.

Abstract translation: 耳机同时允许高级低频声音和有效降噪。 耳机具有与环境空间分离的前腔。耳机具有壳体，该壳体具有将前腔和与环境空间的声学顺应性分开的后腔的壁; 第一隔膜可往复运动地悬挂在前腔和后空腔之间的壳体壁中的第一通孔上，并适于主动驱动以提供声输出信号; 以及第二隔膜，其可往复运动地悬挂在所述后腔和环境空间之间的所述壳体壁中，其中所述声共振系统被配置为使得所述谐振频率低于500Hz。 第二个隔膜在高于谐振频率的频率处衰减从环境空间进入后腔的声学信号，并且在谐振频率以下的频率实际上增加了后腔的声学柔度。