19 Nov 1999
Sphinx Speech Group, CMU-SCS (rkm@cs.cmu.edu)
Cross-Word Triphone Modeling
·Sphinx uses “triphone” or “phoneme-in-context” HMMs
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·Cross-word transitions use appropriate exit-model, and inject left-context into entry state
AH
ONE
W
N
Context- dependent AH  HMM
Separate N  HMM instances for each possible right context
Multiplexed W  HMM; inherited left context propagated along with path-scores, and dynamically modifies the state model (Replication is too expensive)