tailieunhanh - Báo cáo khoa học: "FINITE STATE PROCESSING OF TONE SYSTEMS"

It is suggested in this paper that t w o - l e v e l 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 (. 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 (C6te d'Ivoire). . | FINITE STATE PROCESSING OF TONE SYSTEMS Dafydd Gibbon U Bielefeld ABSTRACT 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 . 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 acccount leads to more insightful definitions of the basic phenomena than other approaches . phonological rules or metrical systems . 1. Descriptive context The topic of this paper is tone sandhi in two West African tone languages and suitable formal models for it. The languages investigated are Tern Gur Voltaic family Togo and Baule Akan family Côte d Ivoire . Tone languages of other types in particular the Sino-Tibetan languages will not be discussed. The specific concern of this paper is with the way in which certain quite well-known morpho-phonological lexical tone patterns are realized in sequence in terms of phonetic pitch patterns. There are three interacting factors involved i. tone text association rules ii. tone sandhi rules iii. phonetic interpretation rules. Tone text association rules are concerned with the association of tones with syllables primary associations and a form of tone spreading as well as floating tones and compound tones. Floating tones are not associated with syllables but are postulated to explain appparent irregularities in phonetic patterning in terms of regular tone sandhi properties. The tone sandhi rules define how tones affect their neighbours. The example to be treated here is a kind of tonal assimilation known as tonal spreading .