5. The method of claim 1 wherein retraining the grapheme to phoneme model comprises combining a pronunciation lexicon and acoustic information.
5. The method of claim 1 wherein retraining the grapheme to phoneme model comprises combining a pronunciation lexicon and acoustic information. 6. The method of claim 5 wherein combining the pronunciation lexicon and the acoustic information comprises interpolating graphoneme model parameters trained using a pronunciation lexicon with those trained via maximum likelihood training or discriminative training using acoustic data.