The purpose of this study was to: 1) to determine if differences exist in acoustic measurements of voice production in individuals with hypofunctional and normal voices and 2) to determine if measurements of voice production are influenced by the speaking context, when comparing sustained vowel production to connected speech. Disordered speaking participants were recruited from Baylor All Saints in Fort Worth, TX in addition to existing recordings. Perceptual judges were recruited from Texas Christian University (TCU) to rate voice quality (breathy vs. normal) of prolonged vowels. A MANOVA revealed main effects on group and condition, and a significant interaction between the two. Significant main effects for group (hypo. vs. normal) were observed on Cepstral peak/expected peak (CPP/EXP) ratio (p<.001), the standard deviation of Cepstral peak/expected peak ratio (CPP/EXPSD) (p<.001), and discrete Fourier transform ratio (DFTR) (p<.001). Significant main effects for condition were observed on CPP/EXP (p<.001), CPP/EXPSD (p<.001), and DFTRSD(p<.001). A significant interaction effect was found for CPP/EXP (p<.001) and CPP/EXPSD (p<.001). These results indicate that cepstral analysis can differentiate between hypofunctional and normal voices. The consistency of significant differences observed in this study suggests that acoustic analyses are capable of discriminating between normal and hypofunctional voices reliably.
| Identifer | oai:union.ndltd.org:TCU/oai:etd.tcu.edu:etd-04262010-125531 |
| Date | 26 April 2010 |
| Creators | Lambert, Emily Ann |
| Contributors | Christopher Watts |
| Publisher | Texas Christian University |
| Source Sets | Texas Christian University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf, application/octet-stream |
| Source | http://etd.tcu.edu/etdfiles/available/etd-04262010-125531/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to TCU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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