3. The method of claim 1 , further comprises: identifying a user based on user identification input; and accessing the plurality of stored audio patterns associated with a user based on the user identification input.
3. The method of claim 1 , further comprises: identifying a user based on user identification input; and accessing the plurality of stored audio patterns associated with a user based on the user identification input. 6. The method of claim 3 , wherein the stored audio patterns and digital tokens are stored in a table and one of the plurality of stored audio patterns in the table is selected by: comparing a digital audio input signal with each stored audio pattern associated with the identified user; and selecting one of the plurality of stored audio patterns with the highest correspondence to the digital audio input.