Variations of laryngeal features in Jianchuan Bai

The tonal system in Jianchuan Bai has attracted much attention for its complex combinations of pitch and phonation type. In this paper, based on EGG signals, three parameters, namely F0, Open Quotient (OQ) and Speed Quotient (SQ), are extracted to examine the tonal quality. It is found that there are two non-modal phonation types, Harsh and Pressed, and roughly four groups of pitch pattern (31/31/41; 33/433; 55/54; 35) in the eight tonal categories. One pair of tones can only be distinguished from each other by phonation type since their pitches are the same. As for other pairs, both pitch and phonation type may contribute to the distinction between them. Notably, non-modal phonation types vary across different Bai speakers. For a particular non-modal tone, one speaker may employ harsh voice, while another may use pressed voice. Sometimes, the non-modal phonation type even changed within a syllable. It is then suggested that different strategies may be used to produce non-modal tones in contrast with their modal counterpart. Moreover, based on the Bai data, how to define different phonation types based on the three basic parameters, F0, OQ and SQ, is discussed. Harsh voice is a better term for the type with the laryngeal features [Middle falling F0, -OQ, -SQ] rather than high-pitched voice.