G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
G11B15/02—Control of operating function, e.g. switching from recording to reproducing
Dispositif de mise en forme et d'exploitation des ondulations de courant d'induit générées par un moteur à courant continu, notamment pour commande de positionnement