Evaluating the articulation index for auditory-visual consonant recognition

Ken W. Grant*, Brian E. Walden

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


Adequacy of the ANSI standard for calculating the articulation index (AI) [ANSI S3.5-1969 (R1986)] was evaluated by measuring auditory (A), visual (V), and auditory-visual (AV) consonant recognition under a variety of bandpass-filtered speech conditions. Contrary to ANSI predictions, filter conditions having the same auditory AI did not necessarily result in the same auditory-visual AI. Low-frequency bands of speech tended to provide more benefit to AV consonant recognition than high-frequency bands. Analyses of the auditory error patterns produced by the different filter conditions showed a strong negative correlation between the degree of A and V redundancy and the amount of benefit obtained when A and V cues were combined. These data indicate that the ANSI auditory-visual AI procedure is inadequate for predicting AV consonant recognition performance under conditions of severe spectral shaping.

Original languageEnglish
Pages (from-to)2415-2424
Number of pages10
JournalJournal of the Acoustical Society of America
Issue number4
StatePublished - Oct 1996
Externally publishedYes


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