Methods and apparatus for echo suppression
CA 2262691 C · Owner: Saikaly, Madeleine · Inventors: Saikaly, Madeleine; Foodeei, Majid; Ho, Dominic
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In methods and apparatus for suppressing echo of a far end signal (114) encoded using LPC-based compression in a near end signal (112) encoded using LPC-based compression, parameters of each frame of the near end encoded signal (112) are processed without synthesizing a speech signal from the near end encoded signal (112) to determine whether sufficient echo to merit echo suppression is present in the frame. Upon determining that insufficient echo to merit echo suppression is present in the frame the parameters of the frame , are passed unmodified. Upon determining that sufficient echo to merit echo suppression is present in said frame, the parameters of the frame are modified …
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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 October 15, 1997 and granted October 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 15, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 2019.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.