Patent ID: 9179202
Filing Date: 2015-11-03
Classification: H04Q

Abstract:
1. A signal processor unit, that is at least partially hardware, comprising: a first-order calculation component configured to calculate a first-order statistic of a multi-frequency signal that includes a high frequency of the multi-frequency signal and a low frequency of the multi-frequency signal; a second-order calculation component configured to calculate a second-order statistic of the multi-frequency signal that includes the high frequency of the multi-frequency signal, the low frequency of the multi-frequency signal, and an estimated average frequency of the multi-frequency signal; an identification component configured to identify the estimated average frequency of the multi-frequency signal through performance of a subtraction with the first-order statistic and the second-order statistic that isolates the estimated average frequency from the multi-frequency signal; a determination component configured to determine a character associated with the multi-frequency signal through use of the estimated average frequency; and an output component configured to output the character after the character is determined.