Patent ID: 6748059
Filing Date: 2004-06-08
Classification: H04M,H04Q

Abstract:
A method for detecting a received tone in response to input information defining the received tone, comprising the steps of:(a) determining for each of all possible tones all sequences of each of all possible tones; (b) comparing all sequences of all possible tones with a portion of the input information by generating a goodness of fit value wherein the goodness of fit value defines how good the comparison is with the input information; (c) determining a subset of sequences that match the input information where all other sequences of all possible tones did not match the input information; (d) comparing sequences of the subset with another portion of the input information; (e) determining a new subset of sequences that match the input information where all other sequences of the subset did not match the input information; (f) repeating steps (d) and (e) by substituting the new subset for the subset of step (d) until a sufficient amount of the input information has been processed; and (g) identifying the received tone as being one of the possible tones.