The Intelligibility of Words, Sentences, and Continuous Discourse Using the Articulation Index
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
Pagination or Media Count:
The purpose of this research was to investigate the effect of message redundancy upon intelligibility. The original methodology for the Articulation Index AI French and Steinberg, J. Acoust. Soc. Am., 19, 90-119, 1947 was used to examine the relation between words, meaningful sentences and continuous discourse CD. One primary consideration was to derive the relations between the three speech types with tightly controlled, highly repeatable experimental conditions such that any difference between them could be attributed solely to inherent contextual differences. One male speaker recorded 616 monosyllabic words, 176 meaningful speech perception in noise SPIN sentences and 44 seventh-grade reading level CD passages. Twenty-four normal hearing subjects made intelligibility estimates of the CD and sentences and identified words at each of 44 conditions of filtering and signal-to-noise ratio. The sentence intelligibility scores and continuous discourse intelligibility scores plotted versus the AI transfer function were within 0.05 AI of each other. The word recognition scores were considerably lower for equivalent AI values of both sentences and CD.
- Anatomy and Physiology