Verfahren zum raschen Nachführen eines Mittelwertes, vorzugsweise des arithmetischen Mittelwertes eines fast periodischen Signals.

1. Method of fast follow-up insertion of a mean value, preferably of the arithmetic mean of a periodic signal, such as e.g., of a signal proportional to the momentary speed of an internal combustion engine, when modifications thereof occur, characterized in that the course of the quasi-periodic signal occurring during a predetermined number of periods is stored as a signal picture, during a subsequent given number of period this stored signal picture is inserted correspondingly to the course of the quasi-periodic signal during said given number of periods, and in that thus continuously during a given number of periods the last inserted stored signal picture is respectively inserted according to the actual course of the quasi-periodic signal during the given number of period, and in that simultaneously with the actualization, the actual course of the quasi-periodic signal is compared in proper phase relation with the stored signal picture in association with the production of a deviation signal, and said deviation signal is linked, particularly linearly combined with a mean value of the quasi-periodic signal or of a signal corresponding to it.