7. The computer-implemented method of claim 6 , wherein training the single pronunciation estimator and training the acoustic models is executed by a nonportable programmable device.
6. The computer-implemented method of claim 1 , where training the single pronunciation estimator further comprises: forming, from sequences of letters of each training word's textual spelling and the corresponding grouping of subword units of the pronunciation, a letter to subword mapping for each training word; and training the single pronunciation estimator using the letter-to-subword mappings.