Method and apparatus for decoding a quadrature modulated signal
CA 1323402 C · Owner: Leitch, Clifford D. · Inventors: Leitch, Clifford D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of demodulating a quadrature modulated signal includes first receiving the signal. The rf signal is then quadrature demodulated to produce in-phase and quadrature signals. One of these signals is filtered to produce a correction signal which is used for phase and amplitude correction. Both of the demodulated signals are again quadrature demodulated to produce the output signals. The second demodulation can be accomplished utilizing a correlation decoder. The applied correlation pulse includes a subcarrier component.
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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 October 19, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 19, 2010.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.