Patents Represented by Law Firm Dellert and Walters
  • Method and apparatus for modifying a video signal
    Patent number: 5402488
    Abstract: A standard video signal is processed by including an interval of an insertion signal whose potential varies continuously between the video sync tip level and a level substantially above blanking level during at least part of the active interval of at least one blank line in the vertical blanking interval.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: March 28, 1995
    Inventor: James A. Karlock