| 发明名称 | Passive acoustical filters incorporating inserts that reduce the speed of sound | ||
| 摘要 | There is disclosed a passive acoustical filter including a first filter element coupled between an ambient and an ear of a listener, at least a portion of the first filter element filled with a material in which a speed of sound is lower than a speed of sound in air. | ||
| 申请公布号 | US9087506(B1) | 申请公布日期 | 2015.07.21 |
| 申请号 | US201514601926 | 申请日期 | 2015.01.21 |
| 申请人 | Doppler Labs, Inc. | 发明人 | Kraft Noah;Lanman Richard Fritz;Wiggins Dan;Oswaks Jonathan;Palmborg Nils Jacob |
| 分类号 | H04R1/40;G10K11/16;G10L21/0232;G10L21/0208;H03G3/32;H04R1/22;H04R1/10;H03G9/02;H03G5/16 | 主分类号 | H04R1/40 |
| 代理机构 | SoCal IP Law Group LLP | 代理人 | SoCal IP Law Group LLP ;Gunther John E.;Sereboff Steven C. |
| 主权项 | 1. A passive acoustical filter to be coupled between an ambient and an ear of a listener, comprising: a double-stage low-pass filter comprising a first low-pass filter element in series with a second low-pass filter element, expansion chambers of the first low-pass filter element and the second low pass filter element filled with respective inserts made from a material in which a speed of sound is lower than a speed of sound in air. | ||
| 地址 | New York NY US | ||