Echo cancellation in two-wire two-way data transmission systems
CA 1112383 A · Owner: Western Electric Company, Incorporated · Inventors: Weinstein, Stephen B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, An adaptive echo canceller for two-wire simultaneous two-way data communication at full bandwidth uses Nyquist-interval, rather than baud-interval processing to achieve independence from timing discrepancies between near-end and far-end terminals. The entire echo signal and not merely baud-interval, samples thereof is suppressed. The echo canceller, is preferably a transversal structure.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted November 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.