13. The method of claim 6 , wherein said generating an output FST using the input FST and the utterance FST further comprises generating an edit FST based at least in part on a subword unit confusion table.
13. The method of claim 6 , wherein said generating an output FST using the input FST and the utterance FST further comprises generating an edit FST based at least in part on a subword unit confusion table. 14. The method of claim 13 , wherein the subword unit confusion table comprises a plurality of insertion, deletion and substitution probabilities.