Method and apparatus for subscription broadcast

Details Method and apparatus for subscription broadcast Method and apparatus for subscription broadcast

H - Electricity

04

K

350/24, 325/3, 3

H04K 1/00 (2006.01) H04M 3/42 (2006.01) H04M 3/487 (2006.01) H04N 7/173 (2006.01)

Patent

CA 1229385

- 21 - METHOD AND APPARATUS FOR SUBSCRIPTION BROADCAST Abstract The system provides a way of utilizing announcement distribution service equipment which is presently in use in telecommunications networks for ordering television or other signals on a per program basis. The program signals are enciphered. The receiver is connected to receive a deciphered signal from a subscriber deciphering unit at a subscriber location. The subscriber unit is connected to the telecommunications network by a non dedicated telephone service line. In response to an order instruction by the subscriber, the unit automatically calls the appropriate announcement distribution service number for the channel associated with the desired program signals and receives from the service the coded key information necessary for it to decipher the program signal. When the program signal is received by the unit, it is accompanied by control signals during retrace intervals which activate deciphering circuitry (G) in the unit. Also disclosed is a method of operation for the system and a subscriber deciphering unit for use in the system.

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