Carrier regeneration circuit
CA 1071718 A · Owner: Fujitsu Limited · Inventors: Katoh, Tadayoshi; Itaya, Eiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A carrier regeneration circuit regenerates the carrier from the QAM (Quadrature Amplitude Modulated) signal obtained by a quadrature partial response modulation system wherein the carriers having the same frequency but a phase difference of 90° are amplitude modulated with two parallel signals which have been subjected to the partial response conversion. The carrier regeneration circuit comprises a probability decision circuit which decides the probability of generation of the demodulated data combination and a carrier regeneration circuit which keeps phase ambiguity of the regenerated carrier a multiple of 90° by controlling the phase of the regenerated carrier by the output of the …
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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.