Single tree method for grammar directed, very large vocabulary speech recognizer

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5621859
SERIAL NO

08183719

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The invention provides a method of large vocabulary speech recognition that employs a single tree-structured phonetic hidden Markov model (HMM) at each frame of a time-synchronous process. A grammar probability is utilized upon recognition of each phoneme of a word, before recognition of the entire word is complete. Thus, grammar probabilities are exploited as early as possible during recognition of a word. At each frame of the recognition process, a grammar probability is determined for the transition from the most likely preceding grammar state to a set of words that share at least one common phoneme. The grammar probability is combined with accumulating phonetic evidence to provide a measure of the likelihood that a state in the HMM will lead to the word most likely to have been spoken. In a preferred embodiment, phonetic context information is exploited, even before the complete context of a phoneme is known. Instead of an exact triphone model, wherein the phonemes previous and subsequent to a phoneme are considered, a composite triphone model is used that exploits partial phonetic context information to provide a phonetic model that is more accurate than aphonetic model that ignores context. In another preferred embodiment, the single phonetic tree method is used as the forward pass of a forward/backward recognition process, wherein the backward pass employs a recognition process other than the single phonetic tree method.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
GOOGLE TECHNOLOGY HOLDINGS LLCMOUNTAIN VIEW, CA22510
GTE SERVICES CORPORATIONCAMBRIDGE, MA18
RAMP HOLDINGS INC.CAMBRIDGE, MA10

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nguyen, Long Medford, MA 51 1022
Schwartz, Richard M Sudbury, MA 19 1251

Cited Art Landscape

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