10. A speech reference enrollment method, comprising the steps of: (a) requesting a user speak a vocabulary word; (b) detecting a first utterance; (c) determining if the first utterance exceeds an amplitude threshold; (d) when the first utterance does not exceed the amplitude threshold, return to step (a); (e) requesting the user speak the vocabulary word; (f) detecting a second utterance; (g) determining a first similarity between the first utterance and the second utterance; (h) when the first similarity is less than a predetermined similarity, requesting the user speak the vocabulary word; (i) detecting a third utterance; (i) determining a second similarity between the first utterance and the third utterance; and (k) when the second similarity is greater than or equal to the predetermined similarity, creating a reference.
10. A speech reference enrollment method, comprising the steps of: (a) requesting a user speak a vocabulary word; (b) detecting a first utterance; (c) determining if the first utterance exceeds an amplitude threshold; (d) when the first utterance does not exceed the amplitude threshold, return to step (a); (e) requesting the user speak the vocabulary word; (f) detecting a second utterance; (g) determining a first similarity between the first utterance and the second utterance; (h) when the first similarity is less than a predetermined similarity, requesting the user speak the vocabulary word; (i) detecting a third utterance; (i) determining a second similarity between the first utterance and the third utterance; and (k) when the second similarity is greater than or equal to the predetermined similarity, creating a reference. 11. The method of claim 10, further including the steps of: (l) determining a third similarity between the second utterance and the third utterance; (m) when the third similarity is greater than or equal to the predetermined similarity, creating the reference.