Meinhard Ullrich

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The performance of the Philips system for large vocabulary continuous speech recognition has been improved signiicantly by crossword N-phone modelling, enhanced clustering of HMM-states during training, consistent handling of untrained HMM-states during decoding and a new eecient crossword N-phone M-gram decoding strategy. We report word error rate(More)
This paper presents an extension of bottom-up state-tying towards improved handling of unseen triphones. As opposed to the usual backing-o to diphones and monophones, the current method aims at nding a triphone model that has proven to exhibit some similarity with the unseen triphone. It is based on a probabilistic mapping of unseen contexts to clusters of(More)
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