The design of caution-warning signals for NASA’s Crew Exploration Vehicle (CEV) and other future spacecraft will be based on both best practices based on current research and evaluation of current alarms. A design approach is presented based upon cross-disciplinary examination of psychoacoustic research, human factors experience, aerospace practices, and acoustical engineering requirements. A listening test with thirteen participants was performed involving ranking and grading of current and newly developed caution-warning stimuli under three conditions: (1) alarm levels adjusted for compliance with ISO 7731, "Danger signals for work places – Auditory Danger Signals", (2) alarm levels adjusted to an overall 15 dBA s/n ratio and (3) simulated codec low-pass filtering. The resulting analyses include determination of sounds that were judged as inappropriate, independent of condition.

Authors: Begault, Durand; Godfroy, Martine; Holden, Kritina; Sandor, Aniko
Affiliations: NASA Ames Research Center;San Jose State University Foundation;LZ Technology;Lockheed Martin Corporation(See document for exact affiliation information.)
AES Convention: 124 (May 2008) Paper Number: 7493
Publication Date: May 1, 2008
Subject: Psychoacoustics, Perception, and Listening Tests

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