Stv subscriber address system

Details Stv subscriber address system Stv subscriber address system

H - Electricity

04

N

350/20

H04N 7/16 (2006.01) H04N 7/167 (2006.01)

Patent

CA 1137214

A B S T R A C T A system for selectively addressing a plurality of television receivers, each of the receivers being identified by a unique n-bit address code, comprises means for transmitting a prefix code which is common to the p most significant bits of a group of address codes during a first horizontal scanning line of the vertical interval of a broadcast television signal. plurality of suffix codes, each comprising the n-p least signifi- cant bits of a different one of the n-bit address codes of the group, are transmitted during each of a series of subsequently occurring horizontal scanning lines of the vertical interval for completely identifying the address codes of the group. Each television receiver includes a decoder for identifying when its associated address code has been transmitted in the form of a corresponding prefix and suffix code.

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