Coupled acoustic echo cancellation system
CA 2242510 A1 · Owner: Finn, Brian M. · Inventors: Finn, Brian M.; Roe, Thomas O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Full acoustic coupling and echo cancellation is provided in implementations where there is acoustic coupling between acoustic zones. In acoustic echo cancellation systems, including active acoustic attenuation systems and communications systems having a, first model canceling the speech of a second person in the output of a first microphone otherwise present due to electrical transmission from a second microphone to a first loudspeaker and broadcast by the first loudspeaker to the first microphone the cancellation of the, speech of the second person in the output of the first microphone preventing rebroadcast thereof by the second loudspeaker, and a second model canceling the speech of the …
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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
- Filed August 20, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2020.
- 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.