Line generator for crt display systems

Abstract

Abstract A VECTOR GENERATOR FOR CRT DISPLAY SYSTEMS THAT LIMITS THE DISPLAY LENGTH OF VECTORS TO A PREDETERMINABLE MAXMUM LENGTH AND PERMITS DISPLAY OF VECTORS HAVING LENGTHS LESS THAN THE PREDETERMINED MAXIMUM LENGTH AT A CONSTANT DISPLAY INTENSITY. DIGITAL LOGIC WORDS REPRESENTATIVE OF THE COMPONENTS OF THE VECTOR TO BE GENERATED ARE CONVERTED INTO ANALOG SIGNALS WHICH ARE INTEGRATED TO FORM RAMP SIGNALS FOR DRIVING DEFLECTION COILS IN A CRT. A CONTROL CIRCUIT, MONITORING THE ANALOG SIGNALS, CONVERTS THESE SIGNALS TO AN APPROXIMATION OF THE SQUARE ROOT OF THE SUM OF THE SQUARES OF THE RECEIVED SIGNALS. THE RESULT IS SUMMED WITH AN ADJUSTABLE VOLTAGE TO ESTABLISH AN ADJUSTED REFERENCE SIGNAL TO THE D/A CONVERTERS FOR CAUSING A VECTOR OF PREDETERMINED LENGTH TO BE DISPLAYED. AN INDEPENDENT REFERENCE SIGNAL PERMITTING VECTORS SHORTER THAN THE PREDETERMINED MAXIMUM LENGTH TO BE DISPLAYED IS CONSTANTLY COMPARED WITH THE ADJUSTED REFERENCE SIGNAL AND IS AUTOMATICALLY SUBSTITUTED THEREFOR WHEN AND AS LONG AS THE MAGNITUDE OF THE ADJUSTED SIGNAL, AS DERIVED FROM THE INPUT DIGITAL LOGIC WORDS TO THE D/A CONVERTERS IS GREATER THAN THE MAGNITUDE OF THE INDEPENDENT REFERENCE SIGNAL. D R A W I N G

Inventors

• 👤 J Bacon
• 👤 G Barnes
• 👤 J Schott

Bibliographic Details