No description available.

In spite of having a fixed standard of pronunciation, English is being used in various ways in parts of the world, particularly in its way of utterance. English vowel is playing one of the significant roles in making different varieties of English language. This essay tries to see into detail how some phonetic features (formant movement, frequency, pitch) of English vowels vary in relation to Bengali, Catalan, Italian, Spanish and Swedish speakers. It has been found that all these speakers vary a lot from each other in the utterance of English vowels.

Previous research (Scheffers, 1983) has indicated that differences in the fundamental frequencies (F(,0)s) of the two simultaneous components in a vowel mixture facilitate the perceptual separation of the vowels. Experiments 1, 2, and 3 were an extension of that work using simultaneous synthesized vowels. They investigated (a) the effects of using vowels with gliding F(,0)s, and (b) the effects of using crossing versus parallel glides. The results indicated that perceptual separation was better when the mixture contained gliding vowels than when it contained steady state ones. In addition, it was found that the separation effect was even stronger when the glides were crossing as compared to being parallel. Experiment 4 investigated the role of formant peaks in vowel identification by employing a vowel mixed with a simultaneous pulse train masker. It was found that the vowel was better identified when the masker was a gliding pulse train as compared to a steady state one. In Experiments 5, 6, and 7 mixtures of unfiltered and filtered (high- and low-pass) pulse trains were used with steady state and gliding F(,0)s and different F(,0) separations. The results indicated that increased F(,0) differences and the use of glides facilitate the perceptual separation of simultaneous sounds. The superior effect of the crossing glides can be explained in terms of the common frequency modulation of the harmonics in each subset (component of the mixture) and the subsequent decorrelation of the harmonics in the two subsets. The type of filtering used had no apparent effect indicating that separation was possible for high-pass filtered pulse trains, probably based on periodicity (timing) information. These findings were discussed in terms of mechanisms of processing.

Thesis (Ph. D.)--Columbia University. 1928. / Sixteen of the plates are each numbered as one page. They are preceded by a detachable transparent leaf containing a diagram for use with the plates. Published also without thesis note under title: The vowel, its physiological mechanisms as shown by X-ray. Vita. Bibliography: p. 352-353.

Thesis (Ph. D.)--Florida State University, 2004. / Advisor: Dr. Richard J. Morris, Florida State University, College of Communication, Dept. of Communication Disorders. Title and description from dissertation home page (viewed Feb. 9, 2005). Includes bibliographical references.

Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.

Thesis (B.Sc)--University of Hong Kong, 2007. / "A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, June 30, 2007." Includes bibliographical references (p. 31-32). Also available in print.

Thesis (B.Sc)--University of Hong Kong, 2007. / "A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, June 30, 2007." Includes bibliographical references (p. 28-30). Also available in print.

Introduction. Statement of the Problem: This is an investigation of the vowels and vowel combinations which appear in certain basal readers designed for use in the primary grades.

No description available.