Sixth European Conference on Speech Communication and Technology

Budapest, Hungary
September 5-9, 1999

Combining Length Restrictions and N-Best Techniques in Multiple-Pass Search Strategies

A. R. Fonollosa, Eloi Batlle

TALP. Dept. of Signal Theory and Communications, Universitat Politécnica de Catalunya, Barcelona, Spain

Multiple-pass search strategies are a necessary choice to reduce the computational cost and memory requirements of large vocabulary speech recognition systems uisng different kinds or complex modelling of speech and language. In the N-best approach the most efficient knowledge sources (usually acoustic models and a bi/trigram language model) are used first to select a short list (N-best) of alternative hypotheses. Then, the remaining more complex knowledge sources are used to rescore the sequences. In this paper we propose a new algorithm to overcome the problems associated with the simple ''Traceback-Based'' N-best algorithm while conserving its simplicity and low computational cost.

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Bibliographic reference.  Fonollosa, A. R. / Batlle, Eloi (1999): "Combining length restrictions and n-best techniques in multiple-pass search strategies", In EUROSPEECH'99, 2713-2716.