Acoustics and Perception of Velar Softening for Unaspirated Stops
ARTICLE IN PRESS Journal of Phonetics 37 (2009) 189–211 www.elsevier.com/locate/phonetics Acoustics and perception of velar softening for unaspirated stops Daniel Recasensa,b,Ã, Aina Espinosaa,b aDepartament de Filologia Catalana, Universitat Auto`noma de Barcelona, Bellaterra, Barcelona, Spain bLaboratori de Fone`tica, Institut d’Estudis Catalans, c/Carme, 47, Barcelona 08001, Spain Received 2 July 2008; received in revised form 16 January 2009; accepted 20 January 2009 Abstract This paper provides articulatory, acoustic and perceptual data in support of the hypothesis that the velar softening process through which /k/ becomes /tP/ is based on articulation rather than on acoustic equivalence if operating on unaspirated stops. Production data for unaspirated /k/ are analyzed for five speakers of Majorcan Catalan, where the velar stop phoneme exhibits (alveolo)palatal or velar allophones depending on vowel context and position. Data on several parameters, i.e., contact anteriority and dorsopalatal contact degree, burst spectral peak frequency, energy and duration, and F2 and F3 vowel transition endpoints and ranges, suggest that /tP/ may have originated from (alveolo)palatal stop realizations not only before front vocalic segments but also before low and central vowels and word finally. Perception results are consistent with the production data in indicating that the most significant /tP/ perception cues are burst energy before /], u/ and burst duration word/utterance finally. They also suggest that velar softening for unaspirated /k/ before front vocalic segments is triggered by an increase in burst frication energy and duration resulting from the narrowing of an (alveolo)palatal central channel occurring at stop closure release.
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