Patent ID: 8265295

Claim:
A method for identifying feedback, the method comprising: determining a candidate frequency within a plurality of frequencies in a signal, the determined frequency having a signal with a first magnitude a first instance in time, the candidate frequency determined by a three-layered, narrowing band iterative process whereby a determined frequency corresponding to a maximum magnitude in a first frequency band at a first iteration becomes a center frequency for a frequency band of a second iteration and a determined frequency corresponding to a maximum magnitude in a second frequency band becomes a center frequency for a frequency band of a third iteration; determining if the signal at the candidate frequency exhibits a growth characteristic by determining if the signal has a second magnitude that is greater than the first magnitude at a second instance in time after the first instance in time; deploying a test filter having a center frequency equal to the candidate frequency; determining if magnitude growth of the candidate frequency subsequently decays after the engaging of the test filter such that the signal at the candidate frequency no longer exhibits a continuous increase in magnitude with respect to time; and if the candidate frequency decays in magnitude growth, determining that the candidate frequency is a feedback frequency and deploying a permanent filter having a center frequency equal to the candidate frequency.