15. A computer-readable storage device having instructions stored which, when executed by a computing device, result in the computing device performing operations comprising: overgenerating potential pronunciations by converting portions of 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; selecting pronunciations in a speech recognition context from the potential pronunciations, to yield selected potential pronunciations; retraining the established set of conversion rules based on the selected potential pronunciations to yield a retrained set of conversion rules; and processing speech based on the retrained set of conversion rules.
15. A computer-readable storage device having instructions stored which, when executed by a computing device, result in the computing device performing operations comprising: overgenerating potential pronunciations by converting portions of 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; selecting pronunciations in a speech recognition context from the potential pronunciations, to yield selected potential pronunciations; retraining the established set of conversion rules based on the selected potential pronunciations to yield a retrained set of conversion rules; and processing speech based on the retrained set of conversion rules. 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.