Abstract: A data processor for automatically selecting from a series of discrete input data elements, the elements having the N highest values and for storing the selected elements, in ascending order according to their values, one in each of N identical cells connected in cascade and wherein means are provided for causing the stored data elements to be readout as a series of a distance parallel data elements. The data proccessor can be used in a number of applications including a star censor for a satellite, or a number of vehicle control system including a visual protection sensor for automobiles and other vehicles, and vehicle tracking/steering systems, or at least partial alignment of the antenna of at least two equipment, or a telephone headset for a mobile radio system.