Context-Dependent Multiple Distribution Phonetic Modeling with MLPs

Part of Advances in Neural Information Processing Systems 5 (NIPS 1992)

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Michael Cohen, Horacio Franco, Nelson Morgan, David Rumelhart, Victor Abrash


A number of hybrid multilayer perceptron (MLP)/hidden Markov model (HMM:) speech recognition systems have been developed in recent years (Morgan and Bourlard. 1990). In this paper. we present a new MLP architecture and training algorithm which allows the modeling of context-dependent phonetic classes in a hybrid MLP/HMM: framework. The new training procedure smooths MLPs trained at different degrees of context dependence in order to obtain a robust estimate of the cootext-dependent probabilities. Tests with the DARPA Resomce Management database have shown substantial advantages of the context-dependent MLPs over earlier cootext(cid:173) independent MLPs. and have shown substantial advantages of this hybrid approach over a pure HMM approach.