Abstract: A digital circuit for generating an error correction or otherwise characterized signal having a value which changes in accordance with a second signal such as the speed of an airplane (MACH). As a specific example, the generated signal is indicative of the error correction required to the static and derived pilot tube pressure signals which error correction changes non-linearly with respect to the velocity of the airplane. Since, in general, each type of airplane requires its own special correction signal, the apparatus must be readily alterable to a given specific application.

Abstract: Digital function generator apparatus providing an output Y from an input X according to ##EQU1## Included in the apparatus is a digital memory, a digital adder, a digital multiplier, and also timing control means.