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Speech & natural language publications October 1, 1992

Hybrid Neural Network/Hidden Markov Model Continuous Speech Recognition

Horacio Franco, Victor Abrash

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Cohen, M., Franco, H., Morgan, N., Rumelhart, D., & Abrash, V. (1992). Hybrid neural network/hidden Markov model continuous-speech recognition. In Second International Conference on Spoken Language Processing.

Abstract

In this paper we present a hybrid multilayer perceptron (MLP)/hidden Markov model (HMM) speaker-independent continuous-speech recognition system, in which the advantages of both approaches are combined by using MLPs to estimate the state-dependent observation probabilities of an HMM. New MLP architectures and training procedures are presented which allow the modeling of multiple distributions for phonetic classes and context-dependent phonetic classes. Comparisons with a pure HMM system illustrate advantages of the hybrid approach both in terms of recognition accuracy and number of parameters required.

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