Article details

Research area
Text to speech

Location
Honolulu, HI

Date
2007

Author(s)
Nathan Bodenstab, Mark Fanty

Multi-Pass Pronunciation Adaptation

Synopsis:

A mapping between words and pronunciations (potential phonetic realizations) is a key component of speech recognition systems. Traditionally, this has been encoded in a lexicon where each pronunciation is transcribed by a  linguist or generated by a grapheme-to-phoneme algorithm. For large vocabulary recognition systems, this process is highly susceptible to errors. We present an off-line data driven algorithm to correct suboptimal pronunciations using transcribed utterances. Unlike previous data driven algorithms that struggle to balance acoustic representation and multi-speaker generalization, our multi-pass approach maximizes both criteria, instead of compromising between the two. We demonstrate on an automated name dialing task that our multipass algorithm achieves a 70% error rate reduction when compared to a baseline grapheme-to-phoneme generated lexicon.

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