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
Managing aging of silicon in an integrated circuit device
Method for computer-based determination of a position in a map, navigation device and mobile radio telephone
Nanogap device for field enhancement and a system for nanoparticle detection using the same
Hedge shear
Human activity monitoring device
Image forming apparatus, control method of image forming apparatus, and storage medium
Method of fabricating a solar cell with a tunnel dielectric layer
  Randomly Featured Patents
Mount bar for video recording and display devices
Carpet backing precoats, laminate coats, and foam coats prepared from polyurethane formulations including fly ash
Dental hygiene apparatus
Flexible ballistic resistant article having a thermoplastic elastomeric honeycomb panel
Antenna module and wireless communication apparatus
Controlling cutting of continuously fabricated composite parts with nondestructive evaluation
Method of manufacturing silicon carbide, silicon carbide, composite material, and semiconductor element
Assembled chair or flowerpot holder
Repeating pattern for an embossed paper product
Method for the underwater cutting of columnar members