A delta-sigma modulation system for time delay and analog function storage

The advent of fast iterative analog computers poses the requirement for storing analog functions for integral multiples of the computer repetition period which is typically of the order of 1 to 10 milliseconds. In addition to function storage for one computer run, it would be desirable to store analog functions for indefinite time intervals to permit table lookup. Typical accuracy requirements might be 0.1 to 0.5 per cent of half-scale at ten times the computer repetition frequency (10 cps to 1000 cps) with somewhat lower accuracy at higher frequencies.