Acoustic Characteristics of Sentences Produced in Noise
Summary rept. Aug 1988-Aug 1989
HARRY G ARMSTRONG AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
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Previous work has described relatively systematic changes in the acoustic-phonetic structure of speech produced in the presence of noise relative to that produced under more benign speaking circumstances. The purpose of this study was to determine whether noise affects the production of continuous speech as it does words produced in isolation. Four speakers were recorded reading 20 sentences, two times in quiet and two times while having 95 dB SPL of pink noise presented through headphones. The sentences were digitized, segmented and transcribed using SPIRE. The resulting data base consisted of approximately 850 segments per subject per speaking condition. The distributions of spectral and temporal properties of classes of segments were determined using SEARCH. All sentences produced in the presence of noise had increases in fundamental frequency and total energy, as has been found for isolated words. Segment durations and spectral characteristics were affected by noise for some subjects more than for others.
- Voice Communications