The Perception of Speech Sounds by Deafened Persons

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Abstract
The intelligibility of speech received over a communication system is usually expressed in terms of vowel or consonant articulation, average speech sound articulation, syllable articulation, word articulation or sentence intelligibility. Mathematical relationships among several of these measures and the articulation index were developed previously, and these are here compared with results of observations on deafened persons. Functions are developed which permit calculation of the articulation index for communication systems including a wide variety of response vs. frequency characteristics and of noise conditions, as well as several types of distortion.

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