Title:
ACTUATOR FOR AN ACTIVE NOISE CONTROL SYSTEM
Document Type and Number:
WIPO Patent Application WO2004064483
Kind Code:
A3
Abstract:
An actuator for use with active noise control (ANR). An ANR voice coil (320) speaker is cylindrical in shape, with a diaphragm (305) to motor diameter less than unity and fits into the ear canal. The rear cavity volume is on the same order of magnitude as the volume of the front cavity defined by the space between the diaphragm and the eardrum. The relatively balanced front/back volume of the ANR speaker reduces the required force to achieve a specific displacement required for high sound pressure output. An ANR balanced armature actuator uses a modified cabinet (400) design, and a segmented or stiffened diaplzrapn (405) made of light materials, and a sheet-type coupling (415) between the armature and the diaphrapn to reduce or eliminate resonances and phase lag within a desired control band. The actuator for use with ANR is well suited for an earplug that has been designed to provide active noise reduction in the ear canal.
Inventors:
VAUDREY MICHAEL A
SAUNDERS WILLIAM R
GOLDSTEIN ANDRE
SAUNDERS WILLIAM R
GOLDSTEIN ANDRE
Application Number:
PCT/US2004/001912
Publication Date:
April 07, 2005
Filing Date:
January 22, 2004
Export Citation:
Assignee:
ADAPTIVE TECH (US)
International Classes:
H04R11/02; H04R1/10; (IPC1-7): H04R25/00
Foreign References:
| US5757946A | 1998-05-26 | |||
| US6757403B2 | 2004-06-29 | |||
| US6404896B1 | 2002-06-11 |
Download PDF: