Effects of digital execution time in a hybrid computer

Recently, for the purpose of improving the computing accuracy of an analog computer as well as assuring the stability of solution, hybrid computing techniques have been developed rapidly in the form of applying digital computing techniques to relatively low accuracy computing elements such as nonlinear element or in the form of combining the conventional analog computing equipment in the simulator, etc. with a digital computer with the aim of realizing low cost, simplified equipment and easy updating. Two problems pointed out on such a bybrid computer are computation assignment between digital and analog parts and effects of digital execution time. In the parallel hybrid computing system in which the above-mentioned digital part operates in parallel with the analog computer, essential time delay required for the digital computation is of prime importance and, in many cases, the computation assignment can not be determined without considering the effects of it. For instance, if the amount of computation on the digital part is increased in order to raise accuracy, execution time is prolonged and so, increased computing error may result.