Abstract
The dominant technology for the recognition of continuous speech is based on Hidden Markov Models (HMMs). These models provide a fundamental structure that is powerful and flexible, but the probability estimation techniques used with these models typically suffer from a number of significant limitations. Over the last few years, we have demonstrated that fairly simple Multi-Layered Perceptrons (MLPs) can be discriminatively trained to estimate emission probabilities for HMMs. Simple context-independent systems based on this approach have performed very well on large vocabulary continuous speech recognition. This chapter will briefly review the fundamentals of HMMs and MLPs, and will then describe a form of hybrid system that has some discriminant properties.
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