Abstract
In mandarin all-syllable recognition, many insert errors occur due to the influence of non-consonant syllables. Introducing the duration model into the recognition process is a direct way to lessen these errors. But that usually could not work well as expected, for the duration is sensitive to speech rate. Hence, aiming at this problem, a novel context dependent duration distribution normalized by speech rate is proposed in this paper and applied to a speech recognition system based on the frame of improved Hidden Markov Model (HMM). To realize this algorithm, the authors employ a new method to estimate the speech rate of a sentence; then compute the duration probability combined with speech rate; and finally implement this duration information in the post-processing stage. With little change in the recognition process and resource demand, the duration model is adopted efficiently in the system. The experimental results indicate that the syllable error rates decrease significantly in two different speech corpora. Especially for the insertions, the error rates reduce about sixty to eighty percent.
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The research is supported by the National Natural Science Foundation of China (Grant No. 60272016).
CHEN YiNing received the B.S. and M.S. degrees in electronic engineering from Tsinghua University in 1999 and 2001 respectively. He is a Ph.D. candidate at the Department of Electronic Engineering of Tsinghua University. His research interests are speech recognition and spoken language processing.
ZHU Xuan received the B.S. degree in electronic engineering from Beijing University of Astronautics and Aeronautics in 1998 and M.S. degree in electronic engineering from Tsinghua University in 2001. She is a Ph.D. candidate at the Department of Electronic Engineering of Tsinghua University. Her research interests are speech recognition and embedded signal processing system design.
LIU Jia received the B.S., M.S. and Ph.D. degrees in electronic engineering from Tsinghua University from 1983, 1986 and 1990 respectively, and was a post doctor in Cambridge University from 1992 to 1994. He is a professor at the Department of Electronic Engineering of Tsinghua University. His research interests are speech recognition, speech coding, speech synthesis and speech. ASIC design. Dr. Liu is a member of IEEE and a senior member of China Institute of Electronics.
LIU RunSheng received the B.S. degree in electronic engineering from Tsinghua University in 1958. He is professor at the Department of Electronic Engineering of Tsinghua University. His research interests are speech recognition, IC design and CAD.
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Chen, Y., Zhu, X., Liu, J. et al. Towards robustness to speech rate in mandarin all-syllable recognition. J. Comput. Sci. & Technol. 18, 756–761 (2003). https://doi.org/10.1007/BF02945464
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DOI: https://doi.org/10.1007/BF02945464