Journal (WSJ) data. The Philips dictation system for phoneme-based large- ... Viterbi-training, one pronunciation per word and within- word triphones. ... dynamically constructed with a list organization (6). Still, resorting to .... 43 Monophones 33 K 18.5 Ref. ... the square root of the bigram-to-trigram perplexity ratio, at least forĀ ...