Contrails
The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

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

Abstract:
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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