Improved Method For Video Inversion Scrambling Systems (1989)

By Blair Schodowski, Scientific Atlanta

This paper pres<~nts an improved method for inverting and re-inverting video signals. The new technology uses a concept which divides the sync into two levels, which permit calculation of the axis of inversion. The divided sync signal consist of splitting the horizontal sync into a -40 IRE and +100 IRE pulses before baseband inversion. The transmission of the split sync signals eliminates luminances errors when reinverting the video signal. Splitting the sync greatly improves overall system dynamics, thus increasing security. Deficiencies relating to current video inversion technology, along with a description of the scrambling method will be discussed.

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