Partial response modulation system
CA 1071719 A · Owner: Fujitsu Limited · Inventors: Katoh, Tadayoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A partial response modulation system can be formed a diffential logic circuit which obtains two parallel output signals two parallel input signals, two pre-coding circuits for the partial response conversion of respective two parallel output signals of the differential logic circuit after pre-coding two partial response converters and a mod-, ulator for quadrature amplitude modulation using respective outputs of the two partial response converters. The differential logic circuit in the case, where the code combination of two parallel input signals is not influenced by phase ambiguity of 90° of the regenerated carrier during demodulation at the receiving side, applies said two parallel input …
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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 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 1997.
- 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.