Paper: Finite State Processing Of Tone Systems

ACL ID E87-1046
Title Finite State Processing Of Tone Systems
Venue Annual Meeting of The European Chapter of The Association of Computational Linguistics
Session Main Conference
Year 1987

It is suggested in this paper that two-level morphology theory (Kay, Koskenniemi) can be ex- tended to include morphological tone. This exten- sion treats phonological features as I/O tapes for Finite State Transducers in a parallel sequential incrementation (PSI) architecture; phonological processes (e.g. assimilation) are seen as variants of an elementary unification operation over feature tapes (linear unification phonology, LUP). The phenomena analysed are tone terracing with tone-spreading (horizontal assimilation), down- step, upstep, downdrift, upsweep in two West Afri- can languages, Tem (Togo) and Baule (C6te d'Ivoire). It is shown that an FST acccount leads to more insightful definitions of the basic pheno- mena than other approaches (e.g. phonological rules or metrical systems)....