ANSI Update Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms Perspective
Perspective  |   June 01, 2000
ANSI Update
 
Author Affiliations & Notes
  • Tom Frank, PhD
    Department of Communication Disorders, The Pennsylvania State University, SA Moore Building, University Park, PA 16802 (814) 863-2006
  • Corresponding author: e-mail: TAF1@psu.edu
Article Information
Hearing & Speech Perception / Acoustics / Hearing Disorders / Perspectives
Perspective   |   June 01, 2000
ANSI Update
American Journal of Audiology, June 2000, Vol. 9, 3-8. doi:10.1044/1059-0889(2000/003)
History: Received October 5, 1999 , Accepted November 24, 1999
 
American Journal of Audiology, June 2000, Vol. 9, 3-8. doi:10.1044/1059-0889(2000/003)
History: Received October 5, 1999; Accepted November 24, 1999

The American National Standards Institute (ANSI) specifies maximum permissible ambient noise levels (MPANLs) allowed in an audiometric test room to ensure that hearing thresholds obtained down to 0-dB HL will not be elevated due to masking by ambient noise. MPANLs were originally specified in 1960 and have been revised in 1977, 1991, and most recently in 1999. The purpose of this report is to offer an overview by providing a historical perspective of the MPANLs recently specified by ANSI (ANSI S3.1-1999), the rationale for revising the MPANLs, the new computational method used for determining the 1999 MPANLs, the ANSI S3.1-1999  octave and one-third octave band MPANLs, and information concerning compliance with the new MPANLs.

Acknowledgments
The author thanks all of the members of ASA WG S3-56 for their contributions to ANSI S3.1-1999  which included Ingrid M. Blood, Elliott H. Berger, John D. Durrant, Jean M. Lovrinic, Ellis Singer, Gerald A. Studebaker, and Laura A. Wilber.
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