Resources Contact Us Home
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
Deadline-driven parallel execution of queries
Malicious attack detection and analysis
System and method for managing self-refresh in a multi-rank memory
Systems and methods for unchoked control of gas turbine fuel gas control valves
Combination of the application of antibodies for immunostimulation together with glucocorticoids
Sampling filter device
Seat post having a non-uniform cross-section
  Randomly Featured Patents
Method and device for folding round pockets
Method for preventing P1 punchthrough
Acquiring a form using a proxy applicant and delegation data
Hydroprocessing of hydrocarbons
Method and apparatus for optically modulating an optical beam with long interaction length optical modulator
Photograph frame mount
Synergistic composition for malaria
Liquid crystal display device
Reed relay and method of assembly