Verfahren zum Ermitteln und Regeln der Bandlaufgeschwindigkeit oder der Umdrehungsgeschwindigkeit

摘要

A method of speed detection comprising the steps of recording pulse signals in a travelling tape or rotating body of magnetic material with an equal distance and reproducing the recorded pulse signals to detect the speed of the tape or the body. Speed control utilizing the above detection means comprises the step of comparing the phases of said reproduced pulse signals and a reference signal of a predetermined frequency to control the tape or body to move at a predetermined speed.