Patent ID: 6438225
Filing Date: 2002-08-20
Classification: H04B,H04M

Abstract:
A system for supplementing echo detection and cancellation comprising:an echo canceller comprising an adaptive filter having a plurality of time domain adaptive filter coefficients, wherein the echo canceller converts the time domain adaptive filter coefficients to the frequency domain to produce a plurality of frequency domain adaptive filter coefficients; an echo detector that receives the plurality of frequency domain adaptive filter coefficients from the echo canceller, performs a spectral evaluation of the frequency domain adaptive filter coefficients, determines a severity of echo present based on the spectral evaluation, and, in response to a determination of severe echo, enables the echo canceller to suppress the severe echo; a first memory storing a computer program operative to evaluate the severity of echo present by analyzing said set of frequency domain adaptive filter coefficients; and a second memory storing said set of frequency domain adaptive filter coefficients accessible by said echo canceller and said first memory.