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Creaky Voice as a Distinctive Feature of Tone Systems

Creaky voice is found in the entering tones (rusheng) in Baduhua, a Chinese dialect in Guangxi. Both rusheng tones in Baduhua have falling contours, yinru being high falling and yangru low falling. Of theoretical interest is that they contrast with the two plain falling tones, yinqu and yangqu, respectively, in the same language. The only difference between the two pairs of tones is presence or absence of creaky voice. This is the first time that creaky voice has been found to serve as the only distinctive feature in differentiating tonal categories.