Obtaining LIP and Glottal Reflection Coefficients from Vowel Sounds

TitleObtaining LIP and Glottal Reflection Coefficients from Vowel Sounds
Publication TypeConference Paper
Year of Publication2006
AuthorsDeng, H., R. K. Ward, M. P. Beddoes, and D. O'Shaughnessy
Conference NameAcoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
PaginationI -I
Date Publishedmay.
Keywordsacoustic wave reflection, filtering theory, glottal reflection coefficients, glottal waves, glottal-vocal-tract filters, human mouths, inverse problem, inverse problems, lip reflection, phonation, speech, speech processing, vocal-tract area functions, vowel sounds

Knowledge about lip and glottal reflection coefficients during phonation is needed to eliminate their distortion effects on the estimates of vocal-tract area functions and glottal waves from vowel sounds. Direct measurements of these coefficients at human mouths are difficult. This paper presents a method for estimating them from vowel sounds. The estimation encounters an ill-defined inverse problem: the number of unknowns is greater than the number of constraints, and non-unique solutions exist for a sound. To overcome this problem, this paper uses a vowel sound produced by a subject whose vocal-tract area function (VTAF) for the sound is known. The estimates of the lip and the glottal reflection coefficients are determined as those that lead to a VTAF solution most similar to the known VTAF for the sound. The lip and the glottal reflection coefficients obtained for /a/ and /i/ are presented


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