Video signal scrambling apparatus
Patent 5768376 Issued on June 16, 1998. Estimated Expiration Date: 
August 6, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 6, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and apparatus for improving video scrambling and employing split sync pulses Scrambling video by horizontal and vertical time shifting Scrambler with self-calibration Method and apparatus for modifying a video signal Video scramble system and equipment Method and apparatus for scrambling and descrambling of video signal with edge fill Patent #: 5438620 InventorAssigneeApplicationNo. 692728 filed on 08/06/1996US Classes:380/222, Including phase inversion of scan line information380/224Including pseudo-synchronizing pulseExaminersPrimary: Barron, Gilberto Jr.Attorney, Agent or FirmInternational ClassH04N 007/171Foreign Application Priority Data1995-10-25 KRAbstractA video signal scrambling apparatus which scrambles a video signal in a cable or commercial broadcasting system to prevent nonsubscribers from viewing the signal and the unwarranted descrambling of the signal. The scrambling apparatus scrambles the video signal in such a manner that a predetermined period of a sync signal is selectively inverted and attenuated, and then an artificial sync signal is inserted into the video signal in which the sync signal is inverted and attenuated, causing the horizontal sync period to be irregular. | |
