Tricolor video signal generator, such as a video game, usable _with a monochrome picture display device

Claim 2

A tri-color video signal generator having a signal output for connecting said generator to the antenna input of a color or a black and white standard television receiver, said generator comprising inter alia a circuit producing red (R), green (V) and blue (B) color signals, and a resistive matrix network having branches to which said color signals are applied, respectively, for deriving a luminance signal from said color signals, characterized in that each of the branches of said resistive matrix network which receive the signals R, V, B, comprises a variable resistor, a fixed resistor arranged in parallel with said variable resistor, switching means for selectively coupling said fixed or said variable resistor to said luminance output, and a manual control, coupled to at least said switching means, for modifying the respective ratios between the color signals R, V, B in the luminance signal, said manual control having a first and a second setting wherein, in said first setting, the R, V, B-ratio for generating the luminance signal corresponds to that required for said color television receiver, while, in said second setting, the RVB-ratio results in a luminance signal having a grey-scale suitable for said black and white television receiver.

Claim 3

A video signal generator as claimed in claim 1, characterized in that the sliding contacts of at least two of the variable resistors are coupled mechanically.

Claim 4

A tri-color video signal generator having a signal output for connecting said generator to the antenna input of a color or a black and white standard television receiver, said generator comprising inter alia a circuit producing red (R), green (V) and blue (B) color signals, and a resistive matrix network having branches to which said color signals are applied, respectively, for deriving a luminance signal from said color signals, characterized in that said generator further comprises a first voltage divider arranged between two of the branches of said resistive matrix network, a second voltage divider arranged between a further one of said branches and one of said two branches, a junction point of each of said voltage dividers being connected to the luminance output of said resistive matrix network, and a manual control for said resistive matrix network for modifying the respective ratios between the color signal R, V, B in the luminance signal Y, said manual control having a first and a second setting wherein, in said first setting, the R, V, B-ratio for generating the luminance signal corresponds to that required for said color television receiver, while, in said second setting, the R, V, B-ratio results in a luminance signal having a grey-scale suitable for said black and white television receiver.

Claim 5

A tri-color video signal generator having a signal output for connecting said generator to the antenna input of a color or a black and white standard television receiver, said generator comprising inter alia a circuit producing red (R), green (V) and blue (B) color signals, and a resistive matrix network having branches to which said color signals are applied, respectively, for deriving a luminance signal from said color signals, characterized in that said generator further comprises a first voltage divider arranged between two of the branches of said resistive matrix network, a second voltage divider arranged between a further one of said branches and one of said two branches, a junction point of each of said voltage dividers being connected to the luminance output of said resistive matrix network, and a manual control for said resistive matrix network for modifying the respective ratios between the color signal R, V, B in the luminance signal Y, said manual control having a first and a second setting wherein, in said first setting, the R, V, B-ratio for generating the luminance signal corresponds to that required for said color television receiver, while, in said second setting, the R, V, B-ratio results in a luminance signal having a grey-scale suitable for said black and white television receiver.

Claim 6

A video signal generator as claimed in claim 3, characterized in that the voltage dividers are in the form of potentiometers whose sliding contacts are coupled mechanically.

Claim 7

A tri-color video signal generator having a signal output for connecting said generator to the antenna input of a color or a black and white standard television receiver, said generator comprising inter alia a circuit producing red (R), green (V) and blue (B) color signals, and a resistive matrix network having branches to which said color signals are applied, respectively, for deriving a luminance signal from said color signals, characterized in that said generator further comprises a voltage divider arranged between two of the branches of said resistive matrix network, a double throw switch for selectively connecting a junction point of said voltage divider and one of said two branches to the luminance output, and a manual control coupled at least to said switch for modifying the respective ratios between color signals R, V, B in the luminance signal, said manual control having a first and a second setting wherein, in said first setting, the R, V, B-ratio for generating the luminance signal corresponds to that required for said color television receiver while, in said second setting, the R, V, B-ratio results in a luminance signal having a grey-scale suitable for said black and white television receiver.

Claim 8

A tri-color video signal generator having a signal output for connecting said generator to the antenna input of a color or a black and white standard television receiver, said generator comprising inter alia a circuit producing red (R), green (V) and blue (B) color signals, and a resistive matrix network having branches to which said color signals are applied, respectively, for deriving a luminance signal from said color signals, characterized in that said generator further comprises a voltage divider arranged between two of the branches of said resistive matrix network, a double throw switch for selectively connecting a junction point of said voltage divider and one of said two branches to the luminance output, and a manual control coupled at least to said switch for modifying the respective ratios between color signals R, V, B in the luminance signal, said manual control having a first and a second setting wherein, in said first setting, the R, V, B-ratio for generating the luminance signal corresponds to that required for said color television receiver while, in said second setting, the R, V, B-ratio results in a luminance signal having a grey-scale suitable for said black and white television receiver.