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
Systems and methods for managing policies on a computer
Utility knife
Toner cartridge and image forming apparatus including the same
Powerline communication device with load characterization functionality
Method and apparatus for establishing a media clip
Multiplexing channels by a medium access controller
Organic electroluminescence element
  Randomly Featured Patents
Cow-shaped LED key cap
System and method for using a firmware interface table to dynamically load an ACPI SSDT
Display apparatus having improved interconnection to video printed circuit board
Apparatus for image transfer with charged particle beam, and deflector and mask used with such apparatus
Coin slot for flip top can
Abrasive sharpener
Sulfur dioxide scrubber with hyroclone separator
Folding knife
Radio communication system
System and method for determining a character encoding scheme