The Tonal System of Baan Language
DOI:
https://doi.org/10.60787/jolan.vol6no1.464Keywords:
Tone, Ogonoid, fundamental frequencies (F0), Baan, tonal processesAbstract
Despite its classification as a distinct language within the Ogonoid cluster, Baan language spoken in the Baan-Ogoi community of Tai Local Government Area of Rivers State, Nigeria, remains severely under-documented. The tonal system has not been studied and this research fills this gap in the description of the Baan language. The study adopted the Autosegmental Phonology framework in addition to an instrumental investigation using the Praat software. Data were elicited from six native speakers using established linguistic tools, including the SIL Comparative African Wordlist and Lingua Descriptive Studies Questionnaire. Pitch track analyses were conducted to measure the fundamental frequencies (F0) of the tones, with tokens segmented and analyzed within a pitch range of 75–500 Hz. F0 measurements were taken from the steady-state portion of vowels to avoid transitional pitch fluctuations, and acoustic findings were cross-verified with auditory judgments. The findings revealed three distinct level tones— High (H), Mid (M), and Low (L)—with measured pitch ranges of 143–172 Hz, 123–134 Hz, and 96–118 Hz, respectively. Both lexical and grammatical functions of tone were identified. Lexically, tone distinguishes identical words which differ only in their tone pattern. Grammatically, tone plays a crucial role in marking aspectual contrasts, notably distinguishing progressive from perfective, and in facilitating word class derivation, such as converting nouns to verbs. The study also revealed that monosyllabic nouns permit all three tone types (H, M, L), while monosyllabic verbs occur with only M and L tones. Additionally, tonal processes were documented, including mid tone spreading, high tone spreading, tone elision, and tone copying. The study contributes richly to the documentation and preservation of the Baan language as well as tone studies in African languages. It is recommended that further studies be conducted on the morphosyntax, pragmatics, and sociolinguistics of Baan to support comprehensive language revitalization.
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