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Experimental results on large vocabulary continuous speech understanding

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2 Author(s)
De Mattia, M. ; Lab. Telecomunicazioni, Torino, Italy ; Giachin, E.P.

System performance is presented for a continuous speech understanding system. The system accepts natural-language queries, with a lexicon of 1000 words. Recognition and understanding work in cascade, a speaker-dependent hidden Markov model (HMM)-based word hypothesizer, generates a lattice of word candidates that is given to a grammar-based understanding stage that extracts the correct word sequence together with its meaning. The authors focus on recent improvements added at the understanding level, consisting of a new statistical modeling of correct word adjacency and function-word losses. Such modeling permits the main problems of interword coarticulation to be dealt with and produces substantial advances in terms of recognition accuracy at a low computational cost. System performance with a language model of perplexity 25 results in 87% correct sentence understanding

Published in:

Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on

Date of Conference:

23-26 May 1989