Method and apparatus for error-control coding in a digital data communications system
CA 2116069 C · Owner: Nec Corporation · Inventors: Ikekawa, Masao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to ensure that a predetermined bit(s) of a bit sequence to be transmitted is correctly received by a receiver the predetermined bit is extracted from the bit sequence. The extracted bit is encoded and then combined with a bit sequence which has not been extracted. The combined bit sequence is convolutionally encoded and then transmitted to the receiver. The bit sequence transmitted undergoes maximum-likelihood decoding using Viterbi algorithm, wherein the information of the predetermined bit encoding is used to decode the predetermined bit. Subsequently, the encoded predetermined bit portion is extracted and subjected to block decoding.
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
- Filed February 21, 1994 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 21, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 2016.
- 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.