42. The computer system of claim 41 the memory storing further instructions that when executed by the processor causes the system to perform the operations of: accepting a plurality of sets of utterances, each set corresponding to a different one of the plurality of languages, the utterances in each set being spoken by the native speakers of the language of each set; and training a set of acoustic models for the subword units using the accepted sets of utterances and pronunciations estimated by the single pronunciation estimator from text representations of the training utterances.
42. The computer system of claim 41 the memory storing further instructions that when executed by the processor causes the system to perform the operations of: accepting a plurality of sets of utterances, each set corresponding to a different one of the plurality of languages, the utterances in each set being spoken by the native speakers of the language of each set; and training a set of acoustic models for the subword units using the accepted sets of utterances and pronunciations estimated by the single pronunciation estimator from text representations of the training utterances. 43. The computer system of claim 42 the memory storing further instructions that when executed by the processor causes the system to perform the operations of: generating, for each word in a list of words to be recognized, an acoustic word model, the generating comprising generating a grouping of subword units representing a pronunciation of the word to be recognized using the single pronunciation estimator.