ANSI-S3.5 › Complete Document History
American National Standard Methods for Calculation of the Speech Intelligibility Index

Complete Current Edition:
   1997 R20 EDITION - REAFFIRMED IN 2020 - June 5, 2020

Obsolete Revision Information:
   1997 R17 EDITION - REAPPROVED IN 2017 - July 1, 2017
   1997 R12 EDITION - REAPPROVED IN 2012 - Jan. 1, 2012
   1997 EDITION - Methods for Calculation of the Speech Intelligibility Index - June 6, 1997
   DOD ADOPTION - FYI ONLY: DOD ADOPTED - Dec. 14, 1992
   1969 EDITION - Methods for Calculation of the Speech Intelligibility Index - Jan. 16, 1969