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  • 006May 25, 2010Parkervision, Inc.Method and system for down-converting and electromagnetic signal, and transforms for sameUS7738587Jul 3, 2003Jun 15, 2010The Directv Group, Inc.Method and apparatus for layered modulationUS7773688Dec 20, 2004Aug 10, 2010Parkervision, Inc.Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multipl
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