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

Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and system for estimating and applying a step size... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and system for estimating and applying a step size..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for estimating and applying a step size... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2754632

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.