control system for access to multi-channel television signals, which make the broadband signal processing by using radio frequency (rf) signals in a plurality of channels is consistent, which allows for the selective du00e9brouillage a in seems arbitrary channels located in a group of channels.the system uses a rotating vector control closed loop injection signal to maintain a nearly constant between the television signals and the signals injected. the combined signals are distributed to subscribers who can then use their plant it provided for the cable.the broadband signal is coupled to a broadband amplifier (104) through a power divider (102). in the signal line (114) are combined with the amplified signal provided by the directional coupler wideband (108) and the resulting composite signal on line (109).the broadband signal line (109) is distributed to the access point (112) of the subscriber through a directional connector (110). the injected signals that together form the composite signal injected in the line (114) is generated by a generator (136) which feeds the wide-band digital rf switch (116).during the time when the injection is needed, the rf switch (116) is in the position shown in the diagram (117).
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