Recursive-like adaptive echo canceller
CA 1091833 A · Owner: Western Electric Company, Incorporated · Inventors: Gitlin, Richard D.; Thompson, John S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, The present invention relates to an echo canceller of the type having a transversal filter for synthesizing from an input signal on a receiving signal path a replica, to approximate an echo signal on a sending signal path for substraction from the echo signal. The canceller includes a subtracting unit for subtracting the replica from the echo signal so as to produce a residual echo. The transversal filter is responsive to the residual echo for changing the replica to reduce the residual echo. The canceller further comprises a first adaptive signal processor which is responsive to the residual echo signal for modifying the echo signal on the sending path before …
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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 December 16, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 16, 1997.
- 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.