Echo cancellers for bidirectional digital transmission systems
CA 1265594 C · Owner: Paschetta, Giorgio · Inventors: Paschetta, Giorgio; Bruno, Carlo Mogavero; Tofanelli, Adler
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Echo cancellation for bidirectional digital transmission systems is improved by cancelling the echo tails of a desired number N of digital symbols transmitted on a line in the next preceding N signalling periods. A circuit for this purpose has a portion which effects a summation of the last N transmitted symbols so as to ease, system implementation by an integrated circuit and a part, which computes an estimated sample of the echo-channel pulse-response. The results are multiplied by one another to obtain an estimated echo-signal.
Read the whole patent
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 6, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 6, 2007.
- 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.