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Issue No.11 - November (1993 vol.15)
pp: 1174-1185
ABSTRACT
<p>This paper presents an artificial neural network (ANN) for speaker-independent isolated word speech recognition. The network consists of three subnets in concatenation. The static information within one frame of speech signal is processed in the probabilistic mapping subnet that converts an input vector of acoustic features into a probability vector whose components are estimated probabilities of the feature vector belonging to the phonetic classes that constitute the words in the vocabulary. The dynamics capturing subnet computes the first-order cross correlation between the components of the probability vectors to serve as the discriminative feature derived from the interframe temporal information of the speech signal. These dynamic features are passed for decision-making to the classification subnet, which is a multilayer perceptron (MLP). The architecture of these three subnets are described, and the associated adaptive learning algorithms are derived. The recognition results for a subset of the DARPA TIMIT speech database are reported. The correct recognition rate of the proposed ANN system is 95.5%, whereas that of the best of continuous hidden Markov model (HMM)-based systems is only 91.0%.</p>
INDEX TERMS
concatenation; neural network models; cross-correlation coefficients; speech dynamics; speaker-independent isolated word speech recognition; probabilistic mapping subnet; feature vector; interframe temporal information; decision-making; classification subnet; multilayer perceptron; associated adaptive learning; DARPA TIMIT speech database; hidden Markov model; correlation methods; decision theory; feedforward neural nets; learning (artificial intelligence); probability; speech recognition
CITATION
J. Wu, C. Chan, "Isolated Word Recognition by Neural Network Models with Cross-Correlation Coefficients for Speech Dynamics", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol.15, no. 11, pp. 1174-1185, November 1993, doi:10.1109/34.244678
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