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

03

H

341/48, 88/0.14

G03H 1/02 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1121887

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 relationship to the drive motor. The tone wheel carries a holographic recording which is a series of one dimensional radial holograms matched to the mechanical drive system driving the tone wheel by incorporating mechanical drive errors in the holographic recordings which are recording 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 involving 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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