Training method for an echo canceller for use in a voice conference system
CA 2014864 C · Owner: Fuda, Hitoshi · Inventors: Fuda, Hitoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A training method for an echo canceller for use in a voice conference system which does not require training every time a remote party is connected anew is described. A training method of the invention for an echo canceller is applicable to a voice conference system which is equipped with a loudspeaker for reproducing speech signals, a microphone for transmitting speech signals and an echo canceller for eliminating echoes in the conference room. The training method includes the step of giving a training signal to the loudspeaker and the echo canceller only at the time of turning on the power supply to the voice conference system. The canceller is trained by the training signal and 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 April 19, 1990 and granted October 18, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 19, 2012.
- 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
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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.