Method and system for estimating and applying a step size...

Details Method and system for estimating and applying a step size... Method and system for estimating and applying a step size...

2011-03-29

2011-03-29

Ngo, Chuong D (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C379S406080

Reexamination Certificate

active

07917562

ABSTRACT:
Disclosed is an improved method and apparatus for estimating and applying a step size value for a least mean squares echo canceller. A power estimate of an excitation signal is compared to a reference power level to determine a shift adjustment. The shift adjustment is added to a reference shift amount to determine a shift amount. The product of an excitation signal and an error signal is then calculated and the product is stored in a memory register comprising a plurality of bits. The bits stored in the memory register are shifted either left or right based upon the shift amount. The shift adjustment may be based in part upon the ratio of the excitation signal power estimate and the reference power level.

REFERENCES:
patent: 5325204 (1994-06-01), Scarpa
patent: 5721772 (1998-02-01), Haneda et al.
patent: 6810273 (2004-10-01), Mattila et al.
S.L. Gay “Fast Projection Algorithms with Application to Voice Echo Cancellation”, Ph.D. Dissertation, Rutgers The State University of New Jersey, New Brunswick, New Jersey, 1994.
D. Messerschmitt et al., “Digital Voice Echo Canceller with a TMS32020”, Application Report: SPRA 129, Digital Signal Processing Solutions, 1989, Texas Instruments, http://focus.ti.com/lit/an/spra129/spra129.pdf, retrieved on Oct. 25, 2004.

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