Encoding of information

Details Encoding of information Encoding of information

H - Electricity

04

L

350/20, 340/70

H04L 9/00 (2006.01) H04N 7/167 (2006.01)

Patent

CA 1155518

ABSTRACT OF THE DISCLOSURE A composite video signal containing an information portion and a synchronisation pulse is encoded by shifting the level of the synchronisation pulse and also by inverting the information portion. The encoding is switched on and off at a randomly chosen frequency, under the control of a random number generator enabled at regular intervals. The encoded signal is transmitted with a data signal representing the random number so that a receiver can decode the received signal. The transmitted data can include details of undesired recipients, to disable their decoders. Applied to a pay TV system, the transmitted data can include the rate to be charged for the program and a billing mechanism at the receiver will meter the appropriate charge. - 1 -

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