The Effects of High Sustained Acceleration on the Acoustic Phonetic Structure of Speech. A Preliminary Investigation.
HARRY G ARMSTRONG AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
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The acoustic-phonetic structure of speech produced under adverse circumstances such as high levels of noise, vibration, and stress, has received little investigation. The purpose of this study was to provide some preliminary data concerning speech produced under high sustained acceleration. Acoustical measurements were made of a set of words spoken by two subjects at 1 G and 6 Gz. Words produced under acceleration differed from words produced at 1 G in both spectral and durational characteristics. The formant shifts observed were similar for both speakers. The first format increased for the majority of vowels. The second format tended to be lower for the front vowels i, epsilon and higher for the back vowel u. Acceleration resulted in a raising of the first formant and a lowering of the second formant relative to the same diphthongs produced at 1 G. Author