Theory of Syntactic Recognition for Natural Languages
Theory of Syntactic Recognition for Natural Languages
The Theory of Parsing, Translation, and Compiling
The Theory of Parsing, Translation, and Compiling
Unification and transduction in computational phonology
COLING '88 Proceedings of the 12th conference on Computational linguistics - Volume 1
The PSI/PHI architecture for prosodic parsing
COLING '88 Proceedings of the 12th conference on Computational linguistics - Volume 1
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It is suggested in this paper that two--level morphology theory (Kay, Koskenniemi) can be extended to include morphological tone. This extension 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), downstep, upstep, downdrift, upsweep in two West African languages, Tem (Togo) and Baule (Côte d'Ivoire). It is shown that an FST account leads to more insightful definitions of the basic phenomena than other approaches (e.g. phonological rules or metrical systems).