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ANSI/ASA S3.5-1997 (R2012)

American National Standard Methods for Calculation of the Speech Intelligibility Index

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, II. The SII is calculated from acoustical measurements of speech and noise.

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