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
Optical article comprising a temporary anti-fogging coating with improved durability
Method and apparatus for the prevention of a service degradation attack
FET device having ultra-low on-resistance and low gate charge
System, method and program product for guiding correction of semantic errors in code using collaboration records
Method for editing a media clip in a mobile terminal device, a terminal device utilizing the method and program means for implementing the method
Apparatus for merging spatial audio streams
Instance management of code in a database
  Randomly Featured Patents
Modular cake pan
Adapted method for spectrum management of digital communication systems
Precision positioning AGM system
Method of allocating advertising space and system therfor
Foam broom
Electro-magnetically shielded connector
Collapsible needle cover
Phase change memory device having Schottky diode and method of fabricating the same
Sphincter treatment apparatus
Display cabinet for shirts