AUTOMATISCHES POSITIONIERUNGSSYSTEM FUER DEN ROTIERENDEN TONKOPF IN EINEM MAGNETBANDGERAET FUER AUFNAHME UND WIEDERGABE.

摘要

The machine records information in a series of discrete tracks extending across the width of a recording medium e.g. a magnetic tape. It includes a positionable structure for supporting a transducer to reproduce the recorded information. The structure is arranged to move the transducer laterally relative to the tracks. A servo controls the lateral position of the structure to cause the transducer to follow a track during reproducing in response to an error signal. A dither signal applied to the servo control to cause oscillatory movement of the transducer relative to the track. The dither signal is provided by a circuit including a sensor generating an error signal indicative of the transducer deviating from a track. A generator provides an oscillatory signal of predetermined frequency and whose magnitude is in direct proportion to the magnitude of the error signal. This provides superior operating capability over a wide range of tape speeds.