Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1988-12-22
1990-03-13
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
3645135, G10L 500
Patent
active
049088653
ABSTRACT:
Recognition of sound units is improved by comparing frame-pair feature vectors which helps compensate for context variations in the pronunciation of sound units. A plurality of reference frames are stored of reference feature vectors representing reference words. A linear predictive coder (10) generates a plurality of spectral feature vectors for each frame of the speech signals. A filter bank system (12) transforms the spectral feature vectors to filter bank representations. A principal feature vector transformer (14) transforms the filter bank representations to an identity matrix of transformed input feature vectors. A concatenate frame system (16) concatenates the input feature vectors of adjacent frames to form the feature vector of a frame-pair. A transformer (18) and a comparator (20) compute the likelihood that each input feature vector for a frame-pair was produced by each reference frame. This computation is performed individually and independently for each reference frame-pairs. A dynamic time warper (22) constructs an optimum time path through the input speech signals for each of the computed likelihoods. A high level decision logic (24) recognizes the input speech signals as one of the reference words in response to the computed likelihoods and the optimum time paths.
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patent: 4544919 (1985-10-01), Gerson
patent: 4625287 (1986-11-01), Matsuura et al.
patent: 4677672 (1987-06-01), Ukita et al.
Pols, L., "Real-Time Recognition of Spoken Words", IEEE Transactions on Computers, vol. C-20, No. 9, pp. 972-978, 9/1971.
Sambur, M., et al., "A Statistical Decision Approach to the Recognition of Connected Digits", IEEE Transactions of Acoustics, Speech, and Signal Processing, vol. ASSP-24, No. 6, pp. 550-558, 12/1976.
Bocchieri Enrico
Doddington George R.
Hiller William E.
Kemeny Emanuel S.
Merrett N. Rhys
Sharp Melvin
Texas Instruments Incorporated
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