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Class Information
Number: 380/219
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > Carrier phase shift
Description: Subject matter in which a picture signal modulated onto a carrier wave is modified by a phase change of the carrier.

Patents under this class:

Patent Number Title Of Patent Date Issued
8594575 Shifted channel characteristics for mitigating co-channel interference Nov. 26, 2013
7720226 Private and secure optical communication system using an optical tapped delay line May. 18, 2010
7583802 Method for using a synchronous sampling design in a fixed-rate sampling mode Sep. 1, 2009
7218753 Template for watermark decoder synchronization May. 15, 2007
7136485 Packetizing devices for scalable data streaming Nov. 14, 2006
7072470 Video scramble/descramble apparatus Jul. 4, 2006
6870931 Method and system for embedding message data in a digital image sequence Mar. 22, 2005
6519340 Method and apparatus for encryption using partial information Feb. 11, 2003
6175630 Method and apparatus for level and phase control of a plurality of RF signals Jan. 16, 2001
6148320 Multichannel digital signal generation method and apparatus Nov. 14, 2000
5864621 Broadband television scrambling and descrambling system Jan. 26, 1999
5754650 Simultaneous multichannel television access control system and method May. 19, 1998
5430799 Multichannel television signal scrambling and descrambling system and method Jul. 4, 1995
4802213 Sound masking in phase reversal TV scrambling system Jan. 31, 1989
4790010 Enhanced scrambling method and system for TV signals Dec. 6, 1988
4706283 Television signal scrambling system Nov. 10, 1987
4706284 Television signal data transmission system Nov. 10, 1987
4598313 Television signal scrambling system Jul. 1, 1986
4467353 Television signal scrambling system and method Aug. 21, 1984
4253114 High security subscription television system employing real time control of subscriber's program reception Feb. 24, 1981
4034402 Video scrambling system Jul. 5, 1977
4002825 System for encoding and decoding amplitude modulated signals Jan. 11, 1977
3999005 Secure transmission of AM or FM signals Dec. 21, 1976
3996418 Scrambler and decoder for secure television system Dec. 7, 1976
3982062 Video encription system Sep. 21, 1976
3936593 Scrambler and decoder for a television signal Feb. 3, 1976

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