Tense-Lax Vowel Classification with Energy Trajectory and Voice Quality Measurements

Suk-Myung LEE
Jeung-Yoon CHOI

IEICE TRANSACTIONS on Information and Systems   Vol.E95-D    No.3    pp.884-887
Publication Date: 2012/03/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E95.D.884
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Speech and Hearing
tense-lax vowel,  voice quality,  energy trajectory,  

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This work examines energy trajectory and voice quality measurements, in addition to conventional formant and duration properties, to classify tense and lax vowels in English. Tense and lax vowels are produced with differing articulatory configurations which can be identified by measuring acoustic cues such as energy peak location, energy convexity, open quotient and spectral tilt. An analysis of variance (ANOVA) is conducted, and dialect effects are observed. An overall 85.2% classification rate is obtained using the proposed features on the TIMIT database, resulting in improvement over using only conventional acoustic features. Adding the proposed features to widely used cepstral features also results in improved classification.