5th International Conference on Spoken Language Processing

Sydney, Australia
November 30 - December 4, 1998

Task Adaptation of Sub-Lexical Unit Models Using the Minimum Confusibility Criterion on Task Independent Databases

Albino Nogueiras-Rodriguez, Josť B. Marino

Universitat Politecnica de Catalunya, Spain

Discriminative training is a powerful tool in acoustic modeling for automatic speech recognition. Its strength is based on the direct minimisation of the number of errors committed by the system at recognition time. This is usually accomplished by defining an auxiliary function that characterises the behaviour of the system, and adjusting the parameters of the system in a way that this function is minimised. The main drawback of this approach is that a task specific training database is needed. In this paper an alternative procedure is proposed: task adaptation using task independent databases. It consists in the combination of acoustic information -estimated using a general purpose training database-, and linguistic information -taken from the definition of the task-. In the experiments carried out, this technique has led to great improvement in the recognition of two different tasks: clean speech digit strings in English and dates in Spanish over the telephone wire.

Full Paper

Bibliographic reference.  Nogueiras-Rodriguez, Albino / Marino, Josť B. (1998): "Task adaptation of sub-lexical unit models using the minimum confusibility criterion on task independent databases", In ICSLP-1998, paper 0770.