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3-1
Intelligibility is a measure of the capability of a message to be comprehended. In simplest terms,
it is the reduction of the modulations of speech that reduce speech intelligibility. The modulation
reductions can also be thought of as a reduction in the signal (the speech) to noise ratio.
Not all frequencies contained in speech contribute equally to intelligibility. While low frequencies
(vowels) make up the largest power portion of the power of a speech signal, it is the higher
frequencies (the consonants) that contribute most to intelligibility.
Refer to the page number listed in this table for information on a specific topic.
Topic See Page #
Influences and Intelligibility 3-2
Measures of Intelligibility 3-6
Practical Measurement of Intelligibility 3-8
Tools for Predicting Intelligibility 3-9
Chapter 3
Speech Intelligibility
Introduction
In this Chapter