Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and apparatus for optimizing scrambling concealment of a video signal by modifying a specialized sync pulse










Image Number 7 for United States Patent #6009172.

A technique for improving the scrambling concealment of a video signal and the like when displayed on a television set or monitor, includes the pulse width and/or pulse position modulation of a horizontal sync pulse in a horizontal blanking interval by time shifting the leading edge of the sync pulse while maintaining the trailing edge thereof stationary, by shifting the leading and/or trailing edge of the pulse, or by position modulating a sync pulse of specialized width. In modifications to the pulse width and pulse position modulation overlay techniques, the negative edge of the end of video lines may be modulated in the same way that the leading edge of the sync pulse is modulated, with the two edges locked together or modulated independently. Thus, the amount of position modulation of the horizontal sync pulse or its edge(s) is maximized so that the pertinent circuits of all television sets will always detect, and thus lock onto, the modulated or wobbling pulse width or pulse position modulated sync pulse. The embodiment in which the negative edges of the ends of video lines are modulated along with the sync pulses, insures that all television sets will lock onto a wobbling edge. This insures the concealment of the video signal, or equivalent signal, in all possible situations and for all types of television sets or monitors. An associated technique also is disclosed for descrambling the scrambled video signal when authorized.








 
 
  Recently Added Patents
HSP20 inhibits amyloidogenesis and neurotoxicity
Query processing with specialized query operators
Output circuit
Vehicle drive control system
Brushless motor drive apparatus and drive method
Semiconductor device, method of manufacturing semiconductor device, and electronic apparatus
System and method of supplying an electrical system with direct current
  Randomly Featured Patents
Lawn chair
Foam plank laminate
Filter cartridge construction
Integrated circuit memory device and method
Illumination system for nonemissive electronic displays
Air vent for a vehicle
Rotary cutter
Supporting system for a mast
Chemical liquid processing apparatus for processing a substrate and the method thereof
Substrate with a photocatalytic coating