A real time system for applications such as DPCM coding with one or two-dimensional prediction, interframe coding, digital filtering and aperture correction, must have an operational time less than 10 ns. A system of several processors is required and time-critical functional units have to be built, preferably as gate arrays. An experimental system has been built in the Heinrich Hertz Institute; its arithmetic and logic unit is an ECL array with 2200 equivalent gates. Other functions are performed by discrete 100 k-ECL modules. The block diagram of the processor and the structure of two-dimensional DPCM with interframe prediction are shown.
