3. The method of claim 1 , wherein the compiling, during the shutdown process, the vocabulary dictionary further comprises: compiling at least a portion of the vocabulary dictionary to delete, from the vocabulary dictionary, the phonetics corresponding to the respective word or the respective phrase associated with the at least one item of the audio content to be deleted from the storage device.
1. A method, implemented in an in-vehicle audio system, for compiling a vocabulary dictionary for speech recognition, the method comprising: receiving a command to add audio content to a storage device of the in-vehicle audio system, each respective item of the audio content having a respective word or a respective phrase associated therewith; and compiling the vocabulary dictionary to add phonetics corresponding to the respective word or the respective phrase associated with each respective item of the audio content to be added to the vocabulary dictionary such that, after completion of the compiling, a speech recognition component of the in-vehicle audio system becomes capable of recognizing an utterance including the respective word or the respective phrase associated with any of the each respective item, the compiling being started while the audio content is being added to the storage device and the compiling being completed before the audio content is completely added to the storage device, wherein: speech recognition control is available after completion of the compiling the vocabulary dictionary, and the speech recognition control related to the each respective item of the audio content becomes available after completion of adding the content to the storage device; and the method further comprises: receiving a second command to delete from the audio content of the storage device; detecting an ignition off event as a result of turning off an ignition of a vehicle including the in-vehicle audio system; initiating a shutdown process of the in-vehicle audio system upon the detecting an ignition off event; and compiling, during the shutdown process, the vocabulary dictionary to delete, from the vocabulary dictionary, phonetics corresponding to a respective word or a respective phrase associated with at least one item of the audio content to be deleted from the storage device in response to the receiving a second command to delete from the audio content of the storage device.