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Speech & natural language publications October 1, 1992

Connectionist Gender Adaptation in a Hybrid Neural Network / Hidden Markov Model Speech Recognition System

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Morgan, N., & Konig, Y. (1992, October). CONNECTIONIST GENDER ADAPTATION IN A YBRID NEURAL NETWORK/HIDDEN MARKOV MODEL. In Proceedings of International Conference on Spoken Language Processing.

Abstract

An approach to modeling long-term consistencies in peech signal within the framework of a hybrid Hidden Markov Model (HMM) / Multilayer Perceptron (MLP peaker-independent continuous-speech recognition system is presented. Several ways to model male and female speech more accurately with separate models are discussed, one of which is investigated in depth. A method which combines gender-independent and -dependent MLP training is demonstrated, improving recognition accuracy while retaining robustness. A series of network architectures (using our training method) for the connectionist estimation of gender-dependent HMM observation probabilities are evaluated in terms of recognition performance and number of additional parameters needed. Experimental evalutation shows a significant improvement in word recognition accuracy over the gender-independent system with a moderate increase in the number of parameters.

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