Error cancelling sync-off-tach tape drive system

Details Error cancelling sync-off-tach tape drive system Error cancelling sync-off-tach tape drive system

G - Physics

11

B

341/48, 88/0.12,

G11B 19/28 (2006.01) G03H 1/06 (2006.01) G11B 15/46 (2006.01)

Patent

CA 1123097

ABSTRACT OF THE DISCLOSURE . . A tape drive system includes a drive motor, a tape drive capstan driven by the drive motor in a fixed rotational relationship with the motor and a tone wheel also driven by the motor and having a fixed rotational relation- ship to the drive motor. The tone wheel carries a holographic recording which is a series of one dimensional radial holograms matched to the mechan- ical drive system driving the tone wheel by incorporating mechanical drive errors in the holographic recordings which are recorded during a combined rotation of the motor, capstan and tone wheel. The holographic recording on the tone wheel is read during subsequent use of the tape drive system involv- ing a rotation of the tone wheel by a laser playback system to produce control signals for a drive motor energizing means to correct intrinsic drive system errors in a "sync-off-tach" type of operation.

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