ANSI S1.1-1994 (ASA 111-1994) Revision of ANSI S1.1-1960 (R1976) Reaffirmed by ANSI March 25, 2004 Includes 2005 Erratum
AMERICAN NATIONAL STANDARD
ANSI S1.1-1994 „ASA 111-1994…
ACOUSTICAL TERMINOLOGY
Accredited Standards Committee S1, Acoustics
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The American National Standards Institute, Inc. (ANSI) is the national coordinator of voluntary standards development and the clearing house in the U.S. for information on national and international standards. The Acoustical Society of America (ASA) is an organization of scientists and engineers formed in 1929 to increase and diffuse the knowledge of acoustics and to promote its practical applications.
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Erratum to ANSI S1.1-1994 American National Standard Acoustical Terminology and ANSI S3.20-1995 American National Standard Bioacoustical Terminology
Both ANSI S1.1-1994 and ANSI S3.20-1995, contain the following error. In ANSI S1.1-1994 the error is on page 35, clause 12.06. In ANSI S3.20-1995, it occurs on page 32, in Annex C, clause C12.06. The existing text is: 12.06 calculated loudness level. Loudness level calculated by a specified procedure. Unit, phon. NOTE 1 Such procedures are given in ANSI S3.4-1980 (R1986), American National Standard Procedure for the Computation of Loudness of Noise, and in ISO 532:1975, Method for Calculating Loudness Level. NOTE 2
Calculated loudness level in phons is related to loudness in sones by the equation
L = 10 log 2 ns , where L is loudness level in phons and ns is loudness in sones. NOTE 3
A twofold change in loudness corresponds to an interval of 10 phons.
******************************************************************************************** The equation given is incorrect and should be: L = 40 + 10 log 2 ns ,
Note that ANSI S3.4-1980 was recently updated and published as ANSI S3.4-2005 American National Standard Procedure for the Computation of Loudness of Steady Sounds.
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