Key signal transmitting method for scrambling a tv picture

Details Key signal transmitting method for scrambling a tv picture Key signal transmitting method for scrambling a tv picture

H - Electricity

04

N

350/26

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

Patent

CA 1248625

ABSTRACT OF THE DISCLOSURE A TV signal scrambling method employs level compression of selected horizontal flyback sections to prevent synchronization at the receiver. Key signals are transmitted along with the TV signal to be used in descrambling the picture, and are generally superposed on the horizontal synchronizing signal portion. The key signal is encoded before transmission so as to prevent unauthorized tapping which might otherwise occur if the key signal was separated and analyzed.

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