Handbook announced in Tech Brief is compendium of information describing multifarious noise methods now in use. Reference material gives user better access to definitions, application, and calculation procedures of current noise rating methods

Bennett, R. L.

Pearsons, K. S.

English

NASA Technical Reports Server

May 1975	 B75-10075 
• 
NASA TECH BRIEF 
Langley Research Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Handbook of Noise Ratings 
.
The "Handbook of Noise Ratings" is a compen-
dium of information describing the multifarious noise 
rating methods now in use. It is an attempt to provide 
reference material in such a manner as to give the user 
better access to the definitions, application, and 
calculation procedures of current noise rating 
methods. 
This book is divided into four rating sections or 
chapters as well as an appendix containing less 
frequently used measures, an abbreviations section, 
and a glossary of acoustical terminology. The chapters 
are: "I. Direct Ratings of Sound Level," "II. 
Computed Loudness and Annoyance Ratings," "III. 
Communication Interference Ratings," and "IV. 
Community Response Ratings." 
The information for individual noise ratings in each 
chapter is placed under an identical group of 
headings. These headings are: "Title," given in its 
most complete form and also in commonly-referred-to 
abbreviations; "Units," in preferred and alternate 
forms with reference levels included when appropriate 
for the units; "Definition," the scope of the measure 
and the parameters it takes into consideration; 
"Standards," including both existing ones and those 
proposed; "Geographical Usage," where the measure 
is most commonly used; "Purpose," the reasons for 
the development of the noise rating , and its major 
uses; and "Background," the development of the 
noise rating as well as a description of the elements of 
the calculation procedures for those measures 
involving relatively complicated techniques. 
Additional headings are relative to the measure in 
use and include: the "Calculation Method," which 
outlines a step-by-step procedure to enable the user to
ideally calculate the noise rating; the "Example," 
where numerical information is used in an effort to 
simulate a real-life situation; and "Equipment," 
which lists the equipment necessary for collecting the 
data, for calculating the noise rating, or for direct 
measurement of the noise rating. 
While most of the information contained in the 
handbook can be found in other references, it is 
anticipated that this single volume of noise rating 
method descriptions will prove to be a useful tool in 
fostering a better understanding of noise ratings and 
their implementation. 
Notes: 
1. The following documentation may be obtained 
from: 
National Technical Information Service 
Springfield, Virginia 22151 
Single document price $9.50 
(or microfiche $2.25) 
Reference: NASA-CR-2376 (N74-23275), 
Handbook of Noise Ratings 
2. Technical questions may be directed to: 
Technology Utilization Officer 
Langley Research Center 
Mail Stop 139-A 
Hampton, Virginia 23665 
Reference: B75-10075 
Source: Karl S. Pearsons and Ricarda L. Bennett of

Bolt Beranek and Newman, Inc.

under contract to

Langley Research Center

(LAR-11799) 
Category: 03 (Physical Sciences) 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	
will be free from privately owned rights.
.
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Handbook of noise ratings

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