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Class Information
Number: 380/213
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > Chrominance scrambling
Description: Subject matter wherein the portion of a video signal which conveys color information is modified.

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
4757531 Encryption of television signals Jul. 12, 1988
4691353 Scrambling systems for CATV Sep. 1, 1987
4682360 Video transmission system Jul. 21, 1987
4663659 Video signal scrambling system employing full line reversal and double burst coding May. 5, 1987
4626890 Method and apparatus for removing phase modulation from the color burst Dec. 2, 1986
4577216 Method and apparatus for modifying the color burst to prohibit videotape recording Mar. 18, 1986
4488183 Copy-proof recording medium and device for adding copy-proof interference signal Dec. 11, 1984
4353088 Coding and decoding system for video and audio signals Oct. 5, 1982
4338628 Scrambled video communication system Jul. 6, 1982

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