10. The computer-readable storage medium of claim 5 , wherein generating a speech-based phonetic sequence of phonetic units comprises: generating a plurality of possible phonetic sequences of phonetic units; using at least one model to generate a probability score for each possible phonetic sequence; and selecting the possible phonetic sequence with the highest score as the speech-based phonetic sequence of phonetic units.
10. The computer-readable storage medium of claim 5 , wherein generating a speech-based phonetic sequence of phonetic units comprises: generating a plurality of possible phonetic sequences of phonetic units; using at least one model to generate a probability score for each possible phonetic sequence; and selecting the possible phonetic sequence with the highest score as the speech-based phonetic sequence of phonetic units. 13. The computer-readable storage medium of claim 10 , wherein selecting a phonetic pronunciation comprises scoring paths through the search structure based on at least one model.