Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1990-03-28
1992-03-17
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 45, G10L 500
Patent
active
050975099
ABSTRACT:
A speech recognizer, for recognizing unknown utterances in isolated-word small-vocabulary speech has improved rejection of out of vocabulary utterances. Both a usual spectral representation including a dynamic component and an equalized representation are used to match unknown utterances to templates for in-vocabulary words. In a preferred embodiment, the representations are mel-based cepstral with dynamic components being signed vector differences between pairs of primary cepstra. The equalized representation being the signed difference of each cepstral coefficient less an average value of the coefficients. Factors are generated from the ordered lists of templates to determine the probability of the top choice being a correct acceptance, with different methods being applied when the usual and equalized representations yield a different match. For additional enhancement, the rejection method may use templates corresponding to non-vocabulary utterances or decoys. If the top choice corresponds to a decoy, the input is rejected.
REFERENCES:
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patent: 5040213 (1991-08-01), Yasuda et al.
"Comparison of Parametric Representations for Monosyllabic Word Recognition in Continuously Spoken Sentences", by Steven B. Davis et al., IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-28, No. 4, Aug. 1980, pp. 357-366 Incl.
"An Improved Endpoint Detector for Isolated Word Recognition", by Lori F. Lamel et al., IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-29, No. 4, Aug. 1981, pp. 777-785 Incl.
"Use of Dynamic Programming in a Syllable-Based Continuous Speech Recognition System", by Melvyn J. Hunt et al., Time Warps, String Edits, and Macromolecules: The Theory and Practice of Sequence Comparison, pp. 163-187 Incl.
"Smoothing Sequences", from book entitled Exploratory Data Analysis by John W. Tukey, pp. 205-214 Inclusive.
Kemeny Emanuel S.
Northern Telecom Limited
Smith Dallas F.
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