Echo canceler
CA 1186764 A · Owner: Nec Corporation · Inventors: Kanemasa, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An echo canceler is proposed wherein nonlinear characteristics of a D/A converter are eliminated so as to effectively cancel an echo (leakage component). Random access memories are used to allow decrease in the dimensions of the memories and hence in the overall circuit so that a compact LSI echo canceler can be easily obtained. In an embodiment an echo canceler is provided which performs convergence in a multiple step manner using a plurality of adaptive digital filters. The adaptive digital filters are sequentially operated to supply data to the corresponding D/A converters. The echo signals are sequentially cancelled in a stepwise manner. As a result a required number of bits of D/A …
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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 May 7, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 7, 2002.
- 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.