Signal coding for secure transmission

Details Signal coding for secure transmission Signal coding for secure transmission

H - Electricity

04

N

350/25

H04N 7/16 (2006.01) H04N 7/169 (2006.01)

Patent

CA 1231435

SIGNAL CODING FOR SECURE TRANSMISSION A B S T R A C T A multiplexed analogue component (MAC) television signal is encrypted for transmission and reception by authorised recipients only by dividing the signal into blocks and reordering the blocks prior to transmission. The signal within each block remains in its original order. Preferably, the signal representing one line of video is split into blocks which are reordered within the line time to cause translation or rotation of analogue components. Alternatively group of lines may be processed as a group to cause reordering of the analogue components between lines. The preferred arrangement does not split the blocks of analogue signals already present in the MAC signal. The receiver is arranged to receive inform- ation regarding the encryption technique with the tele- vision signal and to reorder the blocks constituting the received signal whereby to reconstruct the original signal.

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