Video attributes decoder for a colour or monochrome display in a teletext mode or in a high-definition alphanumerical mode

摘要

the present invention relates to a video decoder of colour or monochrome display attributes (in high definition mode and mode in the videotex videotex mode with the choice between the alphanumeric mode or the mode semigraphique, composed of a clock circuit (25). no configuration register (23), a register (22) attributes of charactersa record of the attributes of lines (32, 33), and a decoding circuit (21) connected to the attributes of the various registers, a masking circuit (41) characters, a su00e9rialisateur (40) connected to the circuit (41) and the masking circuit (25), a clock inversion circuit (53), a bottom the control circuit (51) of the color of the character, and a circuit (52) for controlling the color of the bottom.the last three circuits are connected in the circuit of the decoder output attributes and multiplexing circuit (50) guns of the monitor control, characterized in that the outlet (402) of the su00e9rialisateur circuit (40) is sent to a circuit (54) for expansion of the point. s exit (542) is connected to a circuit input of the multiplexer.and in that it further comprises a logic circuit (31), double height related to the attribute register line (33) and the selection lines (lc0 slice, the) of characters in a read only memory (15) generates character.