INTERSPEECH 2012
13th Annual Conference of the International Speech Communication Association

Portland, OR, USA
September 9-13, 2012

How Consonants, Dialect and Speech Rate Affect Vowel Devoicing?

Masako Fujimoto (1), Seiya Funatsu (2), Ichiro Fujimoto (3)

(1) National Institute for Japanese Language and Linguistics, Tokyo, Japan
(2) Science Information Center, Prefectural University of Hiroshima, Japan
(3) Faculty of Engineering, Takushoku University, Tokyo, Japan

We examined the glottal opening pattern during devoicing environment,with respect to the factors that facilitate or suppress devoicing. The results indicated that glottal opening patterns are twofold: a single phase- and a double phase opening for /CVC/. Only single phase openings appeared at typical consonantal environments for a Tokyo speaker. Gestural reorganization is assumed for these cases. Double phase opening appeared for an atypical consonantal environment for the Tokyo speaker. For a speaker of Osaka dialect, in which devoicing is less frequent, double phase opening appeared regardless of a typical or atypical consonantal environment. The effect of atypical consonantal environments and dialect on devoicing are due to glottal gesture overlap. In faster speech, a double phase tends to merge which facilitates devoicing. In consecutive devoicing environments, the vowel in a typical consonantal environment is the first candidate with/without devoicing of the following vowel. The following vowel can be devoiced if the glottal opening for the preceding /CVC/ is reorganized. During the phrase final /u/, both single- and double phase openings appeared for Tokyo speakers. Greater interpersonal variations appeared for devoicing at phrase final position.

Index Terms: vowel devoicing, consonantal environment, speech rate, dialects, phrase final position, consecutive devoicing environments

Full Paper

Bibliographic reference.  Fujimoto, Masako / Funatsu, Seiya / Fujimoto, Ichiro (2012): "How consonants, dialect and speech rate affect vowel devoicing?", In INTERSPEECH-2012, 134-137.