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
Press nut
Submersible remote smoke sensor
Drugs for prophylaxis or mitigation of taxane-induced neurotoxicity
Case for electronic device
Towel clip
Wristwatch
Field device configuration system
  Randomly Featured Patents
Display device for exterior rearview mirror
CDMA type multiple transmission apparatus and CDMA type multiple transmission method
Method of mapping geometric entities from a continuous plane to a discrete plane
Contingency mode operating method for air conditioning system
Virtual WWW server for enabling a single display screen of a browser to be utilized to concurrently display data of a plurality of files which are obtained from respective servers and to send
Articulation mechanism for an endoscope
Electrical appliance for preserving and chilling fruit
Joining tissue with bioabsorbable isocyanate
Pellicle and method of using the same
Method and apparatus for discriminating between movie film and non-movie film and generating a picture signal processing mode control signal