Speech recognition method and apparatus

Details Speech recognition method and apparatus Speech recognition method and apparatus

1988-06-30

1990-04-17

Harkcom, Gary V.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 41, G10L 708

Patent

active

049187317

ABSTRACT:
A reference speech pattern is described as a time series of a fixed number of states. Each of states is described with one feature vector (centroid) which represents a feature quantity of a speech portion contained in the state, and a duration time of that state. Pattern matching is carried out between the time series of feature vectors of the input speech pattern and the time series of the states which describe the reference pattern. A weighting function modifies the pattern matching distance depending on differences in duration times between the input speech and the reference pattern.

REFERENCES:
patent: 3816722 (1974-06-01), Sakoe et al.
patent: 4053710 (1977-10-01), Advani et al.
patent: 4400828 (1983-08-01), Pirz et al.
patent: 4608708 (1986-08-01), Watanabe
patent: 4761815 (1988-08-01), Hitchcock
patent: 4783804 (1988-11-01), Juang et al.
Levinson, Computer and Speech Language, "Continuously Variable Duration Hidden Markov Models For Automatic Speech Recognition", Academic Press Inc. (London) Limited, 1986, pp. 29-45.
Itahashi et al., "Discrete--Word Recognition Utilizing a Word Dictionary and Phonological Rules", IEEE Trans. on Audio and Electroacoustics, vol. AU--21, No. 3, Jun. 1973, pp. 239-248.

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