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Understanding speech recognition using correlation-generated neural network targets

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1 Author(s)
Yonghong Yan ; Center for Spoken Language Understanding, Oregon Graduate Inst. of Sci. & Technol., Portland, OR, USA

Training neural networks with variable targets for speech recognition systems has been shown to be effective in improving word accuracy. In this correspondence, a new and simple method for estimating variable targets for a given training pattern is presented. It uses estimated correlations between different output nodes of a neural network to create a set of variable targets for each training pattern. Experimental results show that the word error is reduced by more than 20% when these new correlation-based targets are compared to more conventional zero/one targets with a squared-error cost function. Performance with these new targets approaches that of high-performance hidden Markov model (HMM) recognizers but requires far fewer parameters

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Speech and Audio Processing, IEEE Transactions on  (Volume:7 ,  Issue: 3 )