·Flat
lexical structure
·Cross-word triphone
modeling
·Multiplexing
at word beginning
·Replication
at word end
·Single-phone
words: combination of both
·LM score applied upon
transition into word
·Trigram
language model
·However,
only single best history maintained
·Beam-based
pruning
·Long-tailed
distribution of active HMMs/frame