Abstract
The reception of speech transmitted through an acoustic channel such as the ocean is limited by multipath time‐smearing. The purpose of the study was to obtain a quantitative measure of the effects of such distortions on speech intelligibility. No such measure presently exists. A linear time invariant channel was used to model the ocean's effects. For the present study, the impulse response was two ideal unit amplitude impulse functions separated in time by a variable delay τ (which ranged from 0 to 250 msec). This produces an echo τ msec after the original signal. Intelligibility results are presented for three types of speech material, Modified Rhyme Test monosyllables, revised CID sentences, and a novel triword test specially designed to measure the effects of multipath type of distortion. [This project was funded by NUSC IR fund.]
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