An acoustical study of fricatives in the speech of dysarthric speakers
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2009
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| Online Access: | http://hdl.handle.net/1721.1/49801 |
| _version_ | 1826190040722571264 |
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| author | Chen, Helen (Haiying Helen), 1975- |
| author2 | Kenneth N. Stevens. |
| author_facet | Kenneth N. Stevens. Chen, Helen (Haiying Helen), 1975- |
| author_sort | Chen, Helen (Haiying Helen), 1975- |
| collection | MIT |
| description | Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998. |
| first_indexed | 2024-09-23T08:34:26Z |
| format | Thesis |
| id | mit-1721.1/49801 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T08:34:26Z |
| publishDate | 2009 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/498012022-01-13T07:54:29Z An acoustical study of fricatives in the speech of dysarthric speakers Chen, Helen (Haiying Helen), 1975- Kenneth N. Stevens. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Electrical Engineering and Computer Science. Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998. Includes bibliographical references (leaves 55-57). The goal of the present study is to better understand dysarthric speakers' speech production through quantitative acoustical analysis of the speech signals. In the past, two acoustical measurements proven to correlate with speech intelligibility in dysarthric speakers are speech rate and slope of the F2 frequency change for certain consonant vowel syllables. In this thesis, several new spectral parameters from acoustical analysis that reflect neuro motor dysfunctions in production of the fricative /s/ have been devised and are presented. These parameters specify the spectrum shape and relative amplitude of the fricative noise, the presence or absence of voicing, and the time variation of the spectrum preceding, during, and following the fricative. Analysis shows that these parameters are highly correlated with the speakers' overall intelligibility as well as intelligibility of the fricative /s/. The top three parameters that differentiate the intelligibility of speakers are related to the spectral shape (spectral tilt), the amount of variation in spectral energy (time variation within the fricative), and the amount of inadvertent spectral energy present prior to frication (precursor). The long-term aim of the study is to develop methods for quantifying disordered speech and for determining the deviation from normal speech. In the long run, these methods can be used to objectively measure the effectiveness of speech therapy as well as the amount of speech degeneration in dysarthric speakers. by Helen Chen. M.Eng. 2009-11-06T16:37:26Z 2009-11-06T16:37:26Z 1998 1998 Thesis http://hdl.handle.net/1721.1/49801 50616551 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 62 leaves application/pdf Massachusetts Institute of Technology |
| spellingShingle | Electrical Engineering and Computer Science. Chen, Helen (Haiying Helen), 1975- An acoustical study of fricatives in the speech of dysarthric speakers |
| title | An acoustical study of fricatives in the speech of dysarthric speakers |
| title_full | An acoustical study of fricatives in the speech of dysarthric speakers |
| title_fullStr | An acoustical study of fricatives in the speech of dysarthric speakers |
| title_full_unstemmed | An acoustical study of fricatives in the speech of dysarthric speakers |
| title_short | An acoustical study of fricatives in the speech of dysarthric speakers |
| title_sort | acoustical study of fricatives in the speech of dysarthric speakers |
| topic | Electrical Engineering and Computer Science. |
| url | http://hdl.handle.net/1721.1/49801 |
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