3. The method of claim 2 , wherein (E) comprises: (E) (1) filtering text from the third document by reference to the second document to produce a filtered document in which text filtered from the third document is marked as unreliable; and (E) (2) using the filtered document and the spoken audio stream to train the acoustic model.
2. The method of claim 1 , further comprising: (E) using the third document and the spoken audio stream to train an acoustic model.