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Measuring Skew Angle and Track Positioning in Rotary Head Tape Drives

IP.com Disclosure Number: IPCOM000081796D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Wong, KY: AUTHOR

Abstract

In rotary head tape drive system, magnetic parallelogram patterns 10 are registered near both edges of a tape 12 and parallel to the tape. If a read head traverses one section of the parallelogram, say H3'', a certain number of pulses will be received to indicate the distance of the head track from line L3. The number of error pulses that is generated is a linear increasing function of the distance of the head from L3 in the V-direction.

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Measuring Skew Angle and Track Positioning in Rotary Head Tape Drives

In rotary head tape drive system, magnetic parallelogram patterns 10 are registered near both edges of a tape 12 and parallel to the tape. If a read head traverses one section of the parallelogram, say H3'', a certain number of pulses will be received to indicate the distance of the head track from line L3. The number of error pulses that is generated is a linear increasing function of the distance of the head from L3 in the V-direction.

In order to distinguish whether the head is to the left or to the right of line L3, magnetic pulses in parallelogram L3' are written at half the frequency of those at H3''. A pulse frequency discriminator may be used to detect from which side the head is located with respect to the reference line L3. With this indication, it is possible to position the tape to give correct initial track position and skew angle for each sweep of the rotating head across the tape.

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