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ASA/ANSI S3.5-1997 (R2024)
Methods for Calculation of the Speech Intelligibility Index
This Standard defines a method for computing a physical measure that is highly correlated with the intelligibility of speech as evaluated by speech perception tests given a group of talkers and listeners. This measure is called the Speech Intelligibility Index, or SII. The SII is calculated from acoustical measurements of speech and noise. This standard is not a substitute for ANSI S3.2-1989 (A 1995) American National Standard Method for Measuring the Intelligibility of Speech over Communication Systems.
Acoustical Society of America [asa]