Television scrambler

Details Television scrambler Television scrambler

H - Electricity

04

N

H04N 7/167 (2006.01) H04N 7/169 (2006.01)

Patent

CA 2077689

A video encryption/decryption system in which lines of video information are stored in digitised form in a block of RAM memory, and are typically shuffled in groups of 32 lines by pivot reading information corresponding to 32 lines from the memory in a first predetermined order, which may for example be sequential order, and writing new input line information into the corre- sponding locations, and then reading from, and writing to, the memory in a second different order which may be random or pseu- do-random, and subsequently repeating these two read/write operations alternately. This enables the line shuffling process to be achieved with a reduced memory requirement, compared with known methods.

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