Electronic Stethoscope for Use in Helicopter Noise Environment

Award Information
Agency: Department of Defense
Branch: Army
Contract: DAMD17-02-C-0028
Agency Tracking Number: A012-1878
Amount: $69,763.00
Phase: Phase I
Program: SBIR
Awards Year: 2002
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Active Signal Technologies, Inc.
13027A Beaver Dam Road, Cockeysville, MD, 21030
DUNS: 959989054
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 John Sewell
 Vice President
 (410) 527-2031
Business Contact
 Keith Bridger
Title: Chief Financial Officer
Phone: (202) 547-0293
Research Institution
"Active Signal Technologies proposes to develop an active noise reduction (ANR) stethoscope that will enable detection and discrimination of heart and breathing sounds in the high noise environment of a UH-60 BlackHawk helicopter. We will enhance ourdirect contact sensor technology, which already provides state-of-the-art physiological signal detection and passive noise rejection, to better match the mechanical impedance of soft tissue and electrical impedance of the headphone/earplugs. Our currentsystem has no air cavities or acoustic tubes and discriminates against all airborne noise leakage. Its effectiveness against all disturbances coupled through the body, whether airborne or structure borne, will be enhanced through frequency-domaindigital-filtering ANR algorithms similar to those used in speech recognition. Since Active Signal's passive noise reduction stethoscope already exhibits excellent performance and the ANR approach does not require any additional sensors or actuators, ourprogram starts with established hardware and can move forward aggressively on the ANR implementation. In Phase I we will deliver an enhanced passive noise reduction stethoscope and will demonstrate the ANR on a workstation simulation using prerecordeddata. In the Option we will interface the stethoscope to the workstation and conduct a real-time ANR demonstration in the most challenging noise environment. Noise immune auscultation is a pivotal techno

* information listed above is at the time of submission.

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