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Class Information
Number: 380/224
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > By modifying synchronizing signal > Including pseudo-synchronizing pulse
Description: Subject matter wherein the modification includes the addition of a false synchronizing pulse.










Patents under this class:

Patent Number Title Of Patent Date Issued
8542829 Method of and apparatus for transmitting data Sep. 24, 2013
8095960 Secure synchronization and sharing of secrets Jan. 10, 2012
7965840 Data transmission and reception method and data transmission and reception device Jun. 21, 2011
7949133 Controlled cryptoperiod timing to reduce decoder processing load May. 24, 2011
7869600 Optical transmitter and transmitting method for transmitting cryptogram Jan. 11, 2011
7706533 Copy protection for video signal using narrowed horizontal synchronization signals Apr. 27, 2010
7620178 Copy protection for video signal added pulses Nov. 17, 2009
7492896 Copy protection for video signal using added negative amplitude pulse Feb. 17, 2009
7471795 Information transmission system Dec. 30, 2008
7352863 Copy protection for video signal using narrowed horizontal synchronization signals and amplitude modulation Apr. 1, 2008
7113597 System and method for protection of video signals Sep. 26, 2006
7050698 Method and apparatus for synthesizing or modifying a copy protection signal using a lowered signal level portion May. 23, 2006
6836549 Method and apparatus for synthesizing and reducing the effects of video copy protection signals Dec. 28, 2004
6424716 Method and apparatus for improved horizontal and vertical overlay signals for greater concealment in modern TV sets Jul. 23, 2002
6421497 Method for locating copy protection pulses within selected video lines of a video signal Jul. 16, 2002
6285765 Method and apparatus for reducing effects of copy protection of composite video signal Sep. 4, 2001
6173109 Method and apparatus for removing or defeating effects of copy protection signals from a video signal Jan. 9, 2001
6028941 Method for the defeat of illegal descramblers sensitive to the edges of sync in scrambled video Feb. 22, 2000
6005839 Data transmitting method, data recording apparatus, data record medium and data reproducing apparatus Dec. 21, 1999
6002830 Method and apparatus for removing or defeating effects of copy protection signals from a video signal Dec. 14, 1999
5978480 System for scrambling and descrambling video signals by altering synchronization patterns Nov. 2, 1999
5912970 Television scrambling system Jun. 15, 1999
5768376 Video signal scrambling apparatus Jun. 16, 1998
5768377 Video signal descrambling apparatus Jun. 16, 1998
5748733 Method and apparatus to reduce effects of certain copy protection purses within a video signal May. 5, 1998
5737417 Videotape anti-copying encryption scheme Apr. 7, 1998
5661801 Method and apparatus for stabilizing and brightening prerecorded TV signals encoded with copy protection Aug. 26, 1997
5651065 Insertion of supplemental burst into video signals to thwart piracy and/or carry data Jul. 22, 1997
5583936 Video copy protection process enhancement to introduce horizontal and vertical picture distortions Dec. 10, 1996
5301033 Circuit for preventing false detection of video sync pulses in a video signal which also contains copy guard signals Apr. 5, 1994
5287409 Method and apparatus for frustrating vertical interval detection in scrambled television signals Feb. 15, 1994
5166976 System and method for detection of a pulse within a video signal Nov. 24, 1992
5142575 Method and apparatus for improving video scrambling and employing split sync pulses Aug. 25, 1992
5125028 Television signal scrambling method and apparatus Jun. 23, 1992
4951315 Video signal noise evaluation and removal circuit Aug. 21, 1990
4924498 Method and apparatus for improving video scrambling and employing split snyc pulses May. 8, 1990
4716588 Addressable subscription television system having multiple scrambling modes Dec. 29, 1987
4521809 Method and apparatus for controlling access to selected television programs Jun. 4, 1985
3958077 Picture transmission systems May. 18, 1976











 
 
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