An Active Noise Reduction Communication Earplug for Helicopter Crew

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$119,926.00
Award Year:
2005
Program:
SBIR
Phase:
Phase I
Contract:
W81XWH-05-C-0031
Award Id:
73730
Agency Tracking Number:
A043-199-0029
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
49 Eagle Ridge Drive, Lebanon, NH, 03766
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
147168343
Principal Investigator:
RobertCollier
Principal Acoustical Engineer
(603) 448-3481
robert.d.collier@dartmouth.edu
Business Contact:
ChristopherPearson
President and CEO
(603) 448-3481
cpearson@sound-innovations.net
Research Institute:
n/a
Abstract
This Phase I SBIR research develops a prototype active earplug and hybrid feedforward-feedback active noise control (ANR) algorithm to provide at least 40 dB noise reduction over all frequencies when used in conjunction with a Gentex HGU-56 helmet. Ear insert hardware will be fabricated from an existing communication earplug (CEP), and an existing hybrid ANR algorithm, used in prior ANR research for circumaural earcups, will be modified for the earplug. The ANR algorithm is implemented on a DSP development system for rapid design and optimization of feedforward and feedback components. The feedforward ANR component is based on the investigator's patented Lyapunov tuning method, which provides excellent stability and noise reduction performance for both stationary and non-stationary noise sources. Prototype hardware and hybrid ANR algorithms will be evaluated through flat plate testing and using a HEAD Acoustics manikin. Experimental evaluation will determine ANR algorithm stability margins and performance with respect to noise source characteristics with and without communication feedthrough. Phase I option tasks provide an initial assessment of communication and speech intelligibility and initiate development of an autonomous ANR module prototype for flight testing early in Phase II.

* information listed above is at the time of submission.

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