Hardware implemented backend search engine for a high-rate speech recognition system
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United States of America Patent
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Jan 8, 2013
Grant Date -
N/A
app pub date -
Dec 22, 2008
filing date -
Dec 24, 2007
priority date (Note) -
Expired
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Abstract
A hardware implemented backend search stage, or engine, for a speech recognition system is provided. In one embodiment, the backend search engine includes a number of pipelined stages including a fetch stage, an updating stage which may be a Viterbi stage, a transition and prune stage, and a language model stage. Each active triphone of each active word is represented by a corresponding triphone model. By being pipelined, the stages of the backend search engine are enabled to simultaneously process different triphone models, thereby providing high-rate backend searching for the speech recognition system. In one embodiment, caches may be used to cache frequently and/or recently accessed triphone information utilized by the fetch stage, frequently and/or recently accessed triphone-to-senone mappings utilized by the updating stage, or both.
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