Tracking system for rotary magnetic recording medium using weighted sampled track values

Claim 1

A tracking system for a rotary magnetic recording disc having a plurality of tracks recorded concentrically thereon, comprising: driving means having a driving shaft which is removably loaded with said rotary magnetic recording disc for rotatably driving said disc; magnetic transducer means for sensing signals recorded on said tracks of said magnetic recording disc; transducer feeding means for feeding said magnetic transducer means to a position where one desired track is located; and control means for controlling said transducer feeding means to effect tracking, said control means including operational means for sampling a signal sensed by said magnetic trasnducer means in response to the rotation of said magnetic recording disc at a plurality of sampling points generally distirbuted along the track, and summing the sampled values with predetermined weight according to the location of the sampling point along the track to produce a weighted addition result, said operational means including means for determining a difference between a present result of weighted addition and an immediately preceding weighted addition result and producing a difference signal if the difference exceeds a first predetermined value, said control means executing a tracking control on said transducer feeding means in response to the produced difference signal to cause said magnetic transducer means to move to a position where a larger weighted addition result is determined, said control means controlling said transducer feeding means to cause said magnetic transducer means to remain at a position where said magnetic transducer means is located when said means for determining determines that a difference between a present result of weighted addition from an immediately preceding of weighted addition is associated with a peak of said signal recorded on said track.