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
System and method to assess serviceability of device
High voltage circuit for electrical stimulation
Packaging sleeve
Lower set insert with a lower ball seat for a downhole plug
System and method for discontinuous reception control start time
Systems, computer programs, and methods for controlling costs of a healthcare practice
Measurement system service for a vehicle instrument panel
  Randomly Featured Patents
Highly efficient 2D/3D switchable display device
Manufacturing method for sintered body with buried metallic member
Flexible paper separation device
Portable terminal with multipurpose earjack
Nitride semiconductor template and method of manufacturing the same
Nitrosourea derivative and process for preparing same
Insecticide mixture for ear tags
Bicycle of type driven by operation of handle
Door operating mechanism for business machines
Frame component for a liquid crystal display