RUNNING-SPEED CONTROL SYSTEM FOR MAGNETIC RECORDING MEDIUM

摘要

A running speed control system for a magnetic recording medium, in which reference signals of a specified frequency are recorded on a running magnetic recording medium and successively regenerated, and then the phase of the regenerated signals is compared with that of the reference signals, a driving mechanism for driving said magnetic recording medium being controlled in accordance with the phase difference thus developed, thereby to feed said magnetic recording medium at a speed relative to said reference signals.