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KMID : 1022420150070010047
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Phonetics and Speech Sciences
2015 Volume.7 No. 1 p.47 ~ p.55
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The Change of Acceptability for the Mild Dysarthric Speakers’ Speech due to Speech Rate and Loudness Manipulation
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Kim Ji-Youn
Seong Cheol-Jae
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Abstract
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This study examined whether speech acceptability was changed under various conditions of prosodic manipulations. Bothspeech rate and voice loudness reportedly are associated with acceptability and intelligibility. Speech samples by twelvespeakers with mild dysarthria were recorded. Speech rate and loudness changes were made by digitally manipulating habitualsentences. 3 different loudness levels (70, 75, & 80dB) and 4 different speech rates (normal, 20% rapidly, 20% slowly, &40% slowly) were presented to 12 SLPs (speech language pathologists). SLPs evaluated sentence acceptability by 7-pointLikert scale. Repeated ANOVA were conducted to determine if the prosodic type of resynthesized cue resulted in asignificant change in speech acceptability. A faster speech rate (20% rapidly) rather than habitual and slower rates (20%, 40%slowly) resulted in significant improvement in acceptability ratings (p <.001). An increased vocal loudness (up to 80dB)resulted in significant improvement in acceptability ratings (p <.05). Speech rate and loudness changes in the prosodicproperties of speech may contribute to improved acceptability.
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KEYWORD
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dysarthria, acceptability, prosody, speech rate, loudness
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