Abstract
There are many situations when it would be helpful to be able to predict how intelligible a talker will be to a specific listener in a specific environment. Metrics such as the Speech Intelligibility Index (SII) [e.g., Ricketts, Ear Hear. 17, 124–132 (1996)] and the Speech Transmission Index (STI) [e.g., Humes et al., J. Speech Hear. Res. 29, 447–462 (1986)] have been used for such purposes. This talk will review the history, philosophy, and effectiveness of these and other metrics in specific situations affecting the chain between talker and listener. Some of the situations include: hearing loss [e.g., HASPI: Kates and Arehart, Speech Commun. 65, 75–93 (2014)], degradations due to room acoustics [e.g., SRMR: Santos et al., Speech Commun. 15, 815–824 (2013)], and assistive communications technologies. The role of assumptions regarding speech in normal versus disorder populations will be briefly touched on.
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