Method to test the function of an adaptive echo canceller
CA 1250633 A · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Dahlqvist, Ingemar E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method of testing an adaptive echo cancellation apparatus for faults, a signal is sent from the send side while the remote signal to the apparatus is disconnected. The received signal originating from the send signal is sampled and cancelled by the echo canceller of the apparatus and the thus-obtained, corrected sampled receive signal is compared with a positive and a negative threshold value. An acceptable quality limit is based on the number of samples per second which exceeds or falls below the threshold values.
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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 February 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 28, 2006.
- 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.