Sixth European Conference on Speech Communication and Technology
Several types of Semi-Continuous HMM (SC-HMM) have been compared with the Continuous Density HMM (CD-HMM) in the context of Speaker Independent Isolated Words Recognition (SI-IWR). It is demonstrated that for the ten-digit vocabulary (TIDIGITS), the SC-HMM outperforms the CD-HMM when memory constraints are imposed on the system. SC-HMMs demonstrate recognition rate of about 95% with a total of 59 Gaussians, while under similar conditions the CD-HMM yield recognition rates of well below 80%. An algorithm for optimal selection of Gaussian functions for SC-HMM is presented.
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Bibliographic reference. Vaich, T. / Cohen, A. (1999): "Comparison of continuous-density and semi-continuous HMM in isolated words recognition systems", In EUROSPEECH'99, 1515-1518.