Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Reexamination Certificate
2007-04-17
2007-04-17
Ni, Suhan (Department: 2615)
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
C381S396000
Reexamination Certificate
active
10762127
ABSTRACT:
An actuator for use with active noise control (ANR). The present invention satisfies design goals commensurate with active noise reduction devices used in small enclosed volumes and moderate-to-high noise environments. An ANR voice coil speaker is cylindrical in shape, with a diaphragm 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 design, and a segmented or stiffened diaphragm made of light materials, and a sheet-type coupling between the armature and the diaphragm 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.
REFERENCES:
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patent: 6404896 (2002-06-01), Yoo et al.
patent: 6757403 (2004-06-01), Urushibata et al.
K. Buck, et al. “An Active Noise Reduction Ear Plug with Driven Feedback Loop.” The 2002 International Congress and Exposition on Noise Control Engineering Dearborn, MI USA. Aug. 19-21 2002.
Phillipe Herzog, “Electroacoustic Design of an Active Earplug.” The 2002 International Congress and Exposition on Noise Control Engineering Dearborn, MI USA. Aug. 19-21 2002.
G.D. Martin, “On the Control of Flexible Mechanical Systems.” PhD Dissertation, Stanford University, 1978.
Goldstein Andre
Saunders William R.
Vaudrey Michael A.
Adaptive Technologies, Inc.
Ni Suhan
Roberts Mardula & Wertheim LLC
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