18. The computer-readable storage device of claim 15 , having additional instructions stored which, when executed by the processor, result in the processor performing operations comprising iteratively performing the overgenerating, the selecting, and the retraining.
19. The computer-readable storage device of claim 18 , having additional instructions stored which, when executed by the processor, result in the processor performing operations comprising assigning weights to rules in the established set of conversion rules based on an effectiveness of each rule in selecting of the pronunciations.