Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1983-04-13
1987-12-08
Kemeny, E. S. Matt
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 500
Patent
active
047122420
ABSTRACT:
Speaker-independent word recognition is performed, based on a small acoustically distinct vocabulary, with minimal hardware requirements. After a simple preconditioning filter, the zero crossing intervals of the input speech are measured and sorted by duration, to provide a rough measure of the frequency distribution within each input frame. The distribution of zero crossing intervals is transformed into a binary feature vector, which is compared with each reference template using a modified Hamming distance measure. A dynamic time warping algorithm is used to permit recognition of various speaker rates, and to economize on the reference template storage requirements. A mask vector with each reference vector on a template is used to ignore insignificant (or speaker-dependent) features of the words detected.
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Doddington George R.
Rajasekaran Periagaram K.
Schalk Thomas B.
Hiller William E.
Kemeny E. S. Matt
Merrett N. Rhys
Sharp Mel
Texas Instruments Incorporated
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