Generator for video signal for reproduction of characters by television receiver

Claim 1

A system for generating a video signal for application to a television receiver to display characters on the cathode ray tube thereof in the form of a matrix having a width of N dots and a height of M rows of dots, such systems including in combination, input means having a plurality of terminals providing in sequence signals representing particular characters, M first gates associated with each character and each having first and second inputs with said first input coupled to the one of said terminals for such character for receiving the signals therefrom, first counter means having N outputs individually connected to said second inputs of said first gates for all the characters and applying pulse signals thereto for rendering said first gates conducting in turn, N second gates having a plurality of inputs and providing an output in response to a signal at any one of said inputs, means connecting said outputs of said first gates for each character to said inputs of predetermined ones of said second gates to produce signals representing the dots of the individual rows forming such character, N third gates each having first and second inputs with said first input coupled respectively to the output of one of said second gates, fourth gate means having N inputs connected to the outputs of said third gates, and second counter means having N outputs connected individually to said second inputs of said third gates and applying pulse signals thereto for rendering said third gates conductive in turn to apply signals to said fourth gate means, said second counter means providing pulses at a repetition rate at least 40 times the repetition rate of said first counter means so that said fourth gate means applies a video signals forming dots in a line as said third gates are rendered conducting, and said first gates provide signals in turn to said second gates for controlling the video signal for successive lines.

Claim 2

A system for generating a video signal for application to a television receiver to display characters on the cathode ray tube thereof in the form of a matrix having a width of N dots and a height of M rows of dots, such systems including in combination, input means having a plurality of terminals providing in sequence signals representing particular characters, M first gates associated with each character and each having first and second inputs with said first input coupled to the one of said terminals for such character for receiving the signals therefrom, first counter means having N outputs individually connected to said second inputs of said first gates for all the characters and applying pulse signals thereto for rendering said first gates conducting in turn, N second gates having a plurality of inputs and providing an output in response to a signal at any one of said inputs, means connecting said outputs of said first gates for each character to said inputs of predetermined ones of said second gates to produce signals representing the dots of the individual rows forming such character, N third gates each having first and second inputs with said first input coupled respectively to the output of one of said second gates, fourth gate means having N inputs connected to the outputs of said third gates, and second counter means having N outputs connected individually to said second inputs of said third gates and applying pulse signals thereto for rendering said third gates conductive in turn to apply signals to said fourth gate means, said second counter means providing pulses at a repetition rate at least 40 times the repetition rate of said first counter means so that said fourth gate means applies a video signals forming dots in a line as said third gates are rendered conducting, and said first gates provide signals in turn to said second gates for controlling the video signal for successive lines.

Claim 10

A system for generating a video signal for application to a television receiver to display characters on the cathode ray tube thereof in the form of line segments having N dot pOsitions along the line and a height of M line segments, and with each line segment having dots in particular positions, such system including in combination, input means having a plurality of terminals providing signals representing particular characters, M first gates connected to each terminal with said gates being individually associated with the M line segments for the character represented by such terminal, counter means connected to said M first gates for each character and applying signals thereto for rendering said first gates operative in turn, N second gates representing the N dot positions in a line segment and having a plurality of inputs and providing an output in response to a signal at any one of said inputs, a plurality of circuit means each connected to said inputs of predetermined ones of said second gates which represent the dot positions for a particular line segment, means connecting the output of each of said first gates to one of said circuit means to actuate said second gates for the particular line segment, N third gates coupled respectively to the outputs of said second gates, and counter means connected to said third gates and applying signals thereto for rendering said third gates operative in turn to provide signals for producing dots in sequence in positions for a particular line segment.

Claim 11

A system for generating a video signal for application to a television receiver to display characters on the cathode ray tube thereof in the form of line segments having N dot pOsitions along the line and a height of M line segments, and with each line segment having dots in particular positions, such system including in combination, input means having a plurality of terminals providing signals representing particular characters, M first gates connected to each terminal with said gates being individually associated with the M line segments for the character represented by such terminal, counter means connected to said M first gates for each character and applying signals thereto for rendering said first gates operative in turn, N second gates representing the N dot positions in a line segment and having a plurality of inputs and providing an output in response to a signal at any one of said inputs, a plurality of circuit means each connected to said inputs of predetermined ones of said second gates which represent the dot positions for a particular line segment, means connecting the output of each of said first gates to one of said circuit means to actuate said second gates for the particular line segment, N third gates coupled respectively to the outputs of said second gates, and counter means connected to said third gates and applying signals thereto for rendering said third gates operative in turn to provide signals for producing dots in sequence in positions for a particular line segment.