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Magnetic Recording Technique

IP.com Disclosure Number: IPCOM000093270D
Original Publication Date: 1967-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Wellbrock, AG: AUTHOR

Abstract

The drawing shows readout signal characteristics for a magnetically recorded, pulse-type signal. A relationship is shown between the total signal output comprising all frequency components and the output of its first harmonic, fundamental, frequency alone for a particular recording surface thickness as the recorded wavelength of the pulse type signal is varied. For example, tape can be used with a cobalt-phosphorus magnetic recording surface.

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Magnetic Recording Technique

The drawing shows readout signal characteristics for a magnetically recorded, pulse-type signal. A relationship is shown between the total signal output comprising all frequency components and the output of its first harmonic, fundamental, frequency alone for a particular recording surface thickness as the recorded wavelength of the pulse type signal is varied. For example, tape can be used with a cobalt-phosphorus magnetic recording surface.

The total signal output 10 above a minimum level 11 remains nearly constant or increases slightly with wavelength. The fundamental frequency output 12 peaks at wavelength 13. The wavelength 13, for the peak, is due to the thickness of the magnetic surface. The fundamental band width 13 is due to the coercivity of the magnetically recorded surface. Thus, the output response of the fundamental frequency component is essentially tuned as a function of the tape's physical and magnetic properties. Also the value of peak wavelength 13 is dependent on the read head gap and the spacing of the head from the magnetic surface.

A tuned tape can optimumly be recorded at its fundamental frequency peak wavelength 13. Conversely, the thickness of the magnetic recording surface can be made substantially equal to a tuned preselected wavelength. In addition, the read signal can be amplified using amplifiers tuned to the fundamental frequency to obtain large signal gains. Systems using this method of recording minim...