A Japanese Text Dictation System Based on Phoneme Recognition and a Dependency Grammar

Shozo MAKINO  Akinori ITO  Mitsuru ENDO  Ken'iti KIDO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E74-A   No.7   pp.1773-1782
Publication Date: 1991/07/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Issue on Continuous Speech Recognition and Understanding)
Category: Dictation Systems

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This paper describes an overview of Japanese text dictation system composed of an acoustic processor and a linguistic processor. The system deals with 843 conceptual words and 431 functional words. The phoneme recognition is carried out using a modified LVQ2 method which we propose. The phoneme recognition score was 86.1% for 226 sentences uttered by two male speakers. The linguistic processor is composed of a processor for spotting Bunsetsu-units and a syntactic processor. The structure of the Bunsetsu-unit is effectively described by a finite-state automaton. The test-set perplexity of the finite-state automaton is 230. In the processor for spotting Bunsetsu-units, using a syntax-driven continuous-DP matching algorithm, the Bunsetsu-units are spotted from a recognized phoneme sequence and then a Bunsetsu-unit lattice is generated. In the syntactic processor, the Bunsetsu-unit lattice is parsed based on the dependency grammar. The dependency grammar is expressed as the correspondence between a FEATURE marker in a modifier-Bunsetsu and a SLOT-FILLER marker in a head-Bunsetsu. The recognition scores of the Bunsetsu-unit and conceptual words were 73.2% and 85.7% for 226 sentences uttered by the two male speakers.