Patent ID: 7711108
Filing Date: 2010-05-04
Classification: H04B

Abstract:
1. A method of adjusting an echo canceller, said method comprising: obtaining a first cross-correlation between a far-end signal and an error signal, wherein said error signal is generated by subtracting an output signal of an adaptive filter from a local-end signal including an echo signal, wherein said adaptive filter utilizes said far-end signal to generate the output signal, and wherein said first cross-correlation is indicative of adequacy of cancellation of said echo signal; determining whether said first cross-correlation is above a pro-determined threshold; relocating said adaptive filter by a few samples if said determining determines that said first cross-correlation is above said pre-determined threshold indicative of said echo signal not being cancelled adequately; calculating a first improvement indicator parameter, wherein said first improvement indicator parameter is calculated after said relocating said adaptive filter by said few samples; and determining whether said first improvement indicator parameter indicates a performance improvement by said adaptive filter after said relocating said adaptive filter by said few samples; wherein said first cross-correlation is defined by: wherein C designates said first cross-correlation, x(n) designates said far-end signal, e(n) designates said error signal.