16. The computing device of claim 11 , wherein the training data comprises acoustic signals that include spoken utterances in a plurality of different languages, and wherein the values of the parameters of the hidden layers are based upon the acoustic signals that include spoken utterances in the plurality of different languages.
17. The computing device of claim 16 , wherein the acoustic signals that include the spoken utterances in the plurality of different source languages are used simultaneously to train the DNN, such that the values of the parameters of the hidden layers and each softmax layer in the DNN are adjusted, and wherein the DNN is updated to comprise a new softmax layer, where the new softmax layer corresponds to a new target language and is trained by acoustic signals comprising spoken utterances in the new target language.