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Fricative consonants: An articulator...

Narayanan, Shrikanth S.

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Fricative consonants: An articulatory, acoustic, and systems study.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Fricative consonants: An articulatory, acoustic, and systems study./
作者:	Narayanan, Shrikanth S.
面頁冊數:	357 p.
附註:	Source: Dissertation Abstracts International, Volume: 56-05, Section: B, page: 2789.
Contained By:	Dissertation Abstracts International56-05B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9530010

Fricative consonants: An articulatory, acoustic, and systems study.
Narayanan, Shrikanth S.

Fricative consonants: An articulatory, acoustic, and systems study. - 357 p.

Source: Dissertation Abstracts International, Volume: 56-05, Section: B, page: 2789.

Thesis (Ph.D.)--University of California, Los Angeles, 1995.

Accurate knowledge of the articulatory and acoustic details of human speech is crucial for better understanding and modeling of our speech production mechanisms. Such knowledge is important for the development of high-quality speech synthesis, low bit rate speech coding, and improved automatic speech recognition strategies. This dissertation addresses the analysis and modeling of fricatives, a class of speech sounds characterized by turbulence generation in the vocal tract. Extensive data were collected using novel measurement techniques from four phonetically-trained native talkers of American English. Magnetic resonance imaging (MRI) provided a detailed characterization of the 3D geometry of the human vocal-tract shapes and dimensions. Dynamic electropalatography (EPG) was useful for analyzing inter- and intra-speaker variabilities while high-quality recordings provided acoustic data necessary for modeling.Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Fricative consonants: An articulatory, acoustic, and systems study.
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100 1 $a Narayanan, Shrikanth S. $3 1909890
245 1 0 $a Fricative consonants: An articulatory, acoustic, and systems study.
300 $a 357 p.
500 $a Source: Dissertation Abstracts International, Volume: 56-05, Section: B, page: 2789.
500 $a Chair: Abeer A. Alwan.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 1995.
520 $a Accurate knowledge of the articulatory and acoustic details of human speech is crucial for better understanding and modeling of our speech production mechanisms. Such knowledge is important for the development of high-quality speech synthesis, low bit rate speech coding, and improved automatic speech recognition strategies. This dissertation addresses the analysis and modeling of fricatives, a class of speech sounds characterized by turbulence generation in the vocal tract. Extensive data were collected using novel measurement techniques from four phonetically-trained native talkers of American English. Magnetic resonance imaging (MRI) provided a detailed characterization of the 3D geometry of the human vocal-tract shapes and dimensions. Dynamic electropalatography (EPG) was useful for analyzing inter- and intra-speaker variabilities while high-quality recordings provided acoustic data necessary for modeling.
520 $a Results showed similarities in the general vocal-tract shapes and the corresponding area-function patterns, across subjects. The vocal-tract dimensions showed, however, significant inter-subject differences which are related to differences in the corresponding acoustic spectra. These differences are attributed to variabilities both in the individual's oral morphology and in the way a particular consonant may be articulated. Distinct tongue body shapes were associated with the different fricative places of articulation. For example, the anterior tongue body shapes were concave for the alveolar fricatives and flat/convex in the postalveolars, implying differences in their aerodynamics. Voiced lingual fricatives showed a tendency towards enlarged supraglottal volumes due to tongue-root advancement.
520 $a Results of the acoustic modeling indicate that a linear source-filter model is fairly adequate for capturing the essential spectral characteristics of sustained fricatives below 10 kHz. The hybrid source models employed a combination of acoustic monopole and dipole sources, in addition to a voice source for voiced fricatives, with the specification of the source location, number, and spectral characteristics motivated by aeroacoustic theory. Dipole sources, stylized by a three-parameter model, located in the vicinity of the appropriate obstacle locations for each place of articulation, accounted for most of the details in the fricative spectra. Results showed good agreement between the spectra obtained from the model and the natural fricative utterances.
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790 $a 0031
791 $a Ph.D.
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