Step size convergence control

Details Step size convergence control Step size convergence control

2006-02-07

2006-02-07

Tran, Sinh (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406010, C379S406020, C379S406060, C379S406080, C379S406100, C379S406110

Reexamination Certificate

active

06996231

ABSTRACT:
A method of converging a step size control for an adaptive filter of a communication channel including: (1) initializing a nominal step size value and a penalty point value; (2) combining the nominal step size value and the penalty point value to generate a step size value; and (3) dynamically changing the step size value in response to a characteristic measure of a quality of the communication channel. The step size value is changed by adjusting the nominal step size value, the penalty point value, or both. In a preferred embodiment the penalty point value is adjusted dependant on: (1) a tone originating from the far end (2) full convergence (3) the power level of a residual error signal (4) the channel's near-end background noise and/or (5) weak double-talk in the communication channel. The nominal step size value is adjusted when an achieved initial combined loss is about 15 dB or greater and is reset by divergence.

REFERENCES:
patent: 4912758 (1990-03-01), Arbel
patent: 5592548 (1997-01-01), Sih
patent: 5687229 (1997-11-01), Sih
Zerguine et al, “Hubrid LMS-LMF algorithm for adaptive echo cancellation”, 1999, IEE Proc.-Vis. Image Process, vol. 146, No. 4, Aug. 1999; pp. 173-180.

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