Method and circuit arrangement for selectively depicting like symbols with different configurations

Claim 1

A circuit arrangement for selectively depicting like symbols with different configurations upon the picture screen of a cathode ray tube, utilizing cooperable intensity control of the cathode beam, and analog x and y coordinate deflection signals respectively derived from the corresponding digital reference point coordinate values, for designating the position at which the symbol involved is to be formed, and digital symbol point coordinate values, for designating the position of a beam-dot within the area in which the symbol is to be formed, which values are supplied by a symbol decoder, whereby an analog x deflection signal is derived from the corresponding digital reference and point coordinate values, and an analog y deflection signal is derived from the corresponding reference point digital coordinate values, comprising means including a first digital-analog converter and combining stages for converting the digital reference and point coordinate values for each pair thereof to form corresponding analog x and y deflection signals, a first resistor, said first analog-digital converter including a plurality of second resistors, and a first transistor having a collector-emitter path connected via said first resistor dependent on the reference point coordinate x values and via said second resistors dependent on the symbol point coordinates to the poles of an operational voltage source, and a second digitalanalog converter including a plurality of third resistors and a second transistor having a collector-emitter path connected to said first resistor in common with said collector-emitter path of said first transistor and dependent on the symbol point coordinates via said third resistors to poles of the operational voltage source, said first resistor developing the x deflection signal.