Adaptive hybrid

Details Adaptive hybrid Adaptive hybrid

1991-08-23

1993-04-20

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379406, 379410, H04B 323

Patent

active

052048543

ABSTRACT:
Echo attenuation facilitates achievement of efficient, full-duplex data communications on two-wire channels. Major advantages are achieved by using an adaptive hybrid in conjunction with echo cancellation. When needed, the adaptive hybrid reduces the amplitude range requirements on the echo canceller and on analog-to-digital conversion, thereby reducing overall cost. This reduction in range requirements reduces the digital word-size required for high-performance echo cancellation and reduces the bit-accuracy needed in the analog-to-digital converter. These reductions in needed word-size and bit accuracy substantially reduce implementation cost. Normally, the adaptive hybrid is used to reduce near-end echoes, which are usually much larger than far-end echoes. The echo canceller attenuates the remaining near-end echo and the far-end echo. Two major objectives are: (1) Cost effectiveness and (2) versatile, effective correction of echoes with various, realistic characteristics. Both objective are achieved in accordance with the teachings of this invention by employing simple but multiple stages. A special training algorithm is also taught.

REFERENCES:
patent: 3922505 (1975-11-01), Hoge
patent: 4334128 (1982-06-01), Snijders
patent: 4669115 (1987-05-01), Messerschmidtt
patent: 4922530 (1990-05-01), Kenney et al.
patent: 5014263 (1991-05-01), Vairavan et al.
An Electronic Hybrid for Adaptive Balance in Telephony, "IEEE Transactions on Comm.", Aug. 1980, pp. 1399.
Dotter et al., "Implementation of an Adaptive Balancing Hybrid," COM-28, p. 1408, Aug. 1980.
White, "An Adaptive Electronic Hybrid Transformer,"IEEE Transactions on Comm., Dec. 1972.

Affiliated with

Also associated with

Rating

Adaptive hybrid does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive hybrid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive hybrid will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1530743