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A Graphic Method for Predicting Audibility of Noise Sources

Report Number: AFWAL TR 82-3086
Author(s): Sanford Fidell;Richard Horonjeff
Corporate Author: Bolt Beranek and Newman Inc.
Laboratory: Flight Dynamics Laboratory
Date of Publication: 1982-0-01
Pages: 42
Contract: F33615-82-M-3221
Project: 2401
Task: 240101
AD Number: ADA123736

This report provides the technical rationale for revision of a chart developed by Fidell, Pearsons, and Bennett (1972). This chart expresses the relationships between signal-to-noise ratio and frequency that govern detectability of acoustic signals by human observers. The chart permits a user: 1) to predict the frequency region of a spectrum that is most detectable in any given ambient noise background; 2) to quantify the degree of detectability of the signal in question; and 3) to estimate reduction in signal-to-noise ratio necessary to render the signal undetectable

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