16. A computer-readable storage device having instructions stored which, when executed by a computing device, cause the computing device to perform operations comprising: overgenerating potential pronunciations based on symbolic input by converting portions of the symbolic input into a number of possible lexical pronunciation variants based on an established set of conversion rules, wherein the symbolic input comprises labeled speech data; identifying potential pronunciations in a speech recognition context to yield identified potential pronunciations; and storing the identified potential pronunciations in a lexicon.
17. The computer-readable storage device of claim 16 , wherein the labeled speech data comprises text and recorded audio.