Digital signal demodulation system
CA 1282126 C · Owner: Nippon Telegraph And Telephone Corporation · Inventors: Matsue, Hideaki; Murase, Takehiro; Ohtsuka, Hiroyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a digital signal demodulation system in a dual polarization radio system, having a first demodulator and a first A/D converter for a main signal, a second demodulator and a second A/D converter for an interference signal (cross polarization signal), a transversal filter for providing a compensation signal for cancelling an interference component in the main signal depending upon the demodulated interference component. The second A/D converter for providing the interference component in digital form is operated with a clock signal regenerated in the main signal branch so that the system operates correctly even when the main signal and cross polarization signal are in an asynchronous …
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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 March 26, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 26, 2008.
- 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.