A method and system for scrambling a plurality of input signals for secure transmission thereof, as well as various methods and systems for television transmission, are disclosed. The disclosed scrambling technique, in one form, includes modulating an in-phase component of at least one carrier signal...http://www.google.es/patents/US4410911?utm_source=gb-gplus-sharePatente US4410911 - Multiple signal transmission method and system, particularly for television
Multiple signal transmission method and system, particularly for television
