Subscription television billing system

Details Subscription television billing system Subscription television billing system

H - Electricity

04

N

350/22

H04N 1/44 (2006.01) H04N 7/16 (2006.01) H04N 7/173 (2006.01)

Patent

CA 1108289

ABSTRACT At the sending end randomly generated binary code numbers and program identification numbers are inserted into the television signal. The code numbers are also processed in accordance with a program assignment code to change or leave unchanged a predetermined characteristic of the television signal. At the receiving end the program identification numbers address a random access memory and read out program assign- ment signals stored therein. The program assignment signals control logic circuits which process the received code numbers in correspondence to the pro- cessing at the transmitter. The program assignment numbers must be updated periodically by a central computer-to-decoder transmission for proper decoding to take place. The program identification numbers are stored in the same memory for billing purposes only if the subscriber accepts the program. Since updating of the program assignment numbers does not take place until all previously stored program identification numbers have been transmitted to the computer along with a customer identification number for billing, initiation of communication between decoder and computer can be subscriber controlled. -1-

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