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Browse Prior Art Database

Translating Narrow Magnetically Recorded Data Tracks

IP.com Disclosure Number: IPCOM000081414D
Original Publication Date: 1974-May-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Frost, WT: AUTHOR

Abstract

This method for translating data in narrow magnetically recorded data tracks yields an increase in the signal-to-noise ratio of the reproduced signal.

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Translating Narrow Magnetically Recorded Data Tracks

This method for translating data in narrow magnetically recorded data tracks yields an increase in the signal-to-noise ratio of the reproduced signal.

A record bearing data recorded by conventional means in a relatively wide magnetic track, as on a card 10 having a magnetic stripe 12, is conventional in all respects.

A storage record, such as a conventional IBM Magcard 14, has data entered in a relatively large number of narrow data tracks 16. For example, the data in the magnetic stripe 12 is transferred to the Magcard 14 in one narrow track 20.

The transfer is effected by thermomagnetic transfer using a laser beam for heating the magnetic surfaces, held in intimate contact, to the Curie temperature of the Magcard 14.

Reproduction of the data in the narrow track 20 is enhanced by transferring the track to a transfer medium, such as conventional loop of magnetic tape 22. The transfer is repeated a number of times (5 in this example), by shafting the Magcard 14 (and the laser beam) downward with respect to the tape loop 22.

An electromagnetic relatively wide track transducer 24 of conventional construction translates all of the tracks on the tape loop 22 simultaneously, as the loop is passed over the transducer 24.

The increased area of magnetically recorded signal with the same (or decreased) background noise area, results in an increased signal-to-noise ratio.

The number of multiple tracks transferred to the t...