| 摘要 |
PCT No. PCT/FR90/00178 Sec. 371 Date Nov. 16, 1990 Sec. 102(e) Date Nov. 16, 1990 PCT Filed Mar. 16, 1990 PCT Pub. No. WO90/11665 PCT Pub. Date Oct. 4, 1990.The device of the invention comprises, in the terminal (7) of each subscriber, a carrier wave generator which sends this wave to a distribution center (1) as long as the television of this terminal is operating, the absence of this wave being detected in the center by a circuit (4) which then sends a shadow channel to the subscriber. The deflecting of the subscriber's television to a source independent of the center can be done only after the sending of a shadow channel to this subscriber. |
