Patents Examined by Daniel E. Harvey
  • Method and a device for symbol introduction in a programme television signal
    Patent number: 4980766
    Abstract: A method of and an apparatus for introducing symbols into a television program signal detects the instantaneous brightness Y.sub.A of a television program signal and before mixing that signal with a symbol signal to achieve a brightness E of the image, shapes the symbol signals so that it has a brightness level B.ltoreq.(E-Y.sub.A) where E is the brightness of the symbol in the image. Only then is the symbol with brightness level B added to the television signal A to form the mixed or added signal B+A.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: December 25, 1990
    Assignee: Bulgarska Televisia Kam Komitet sa Televisia i Radio
    Inventor: Emil P. Vladkov