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Recording Scanning by Variable Bias or Recording Signal Frequency

IP.com Disclosure Number: IPCOM000096030D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Braun, RE: AUTHOR

Abstract

Scanned recording of the information across the width of the magnetic tape medium in selective recording tracks is performed to accomplish greater density of information recording. A multi-step recording gap head is employed. The frequency of the bias or the frequency content of the recording signal is varied in relation to the gap distance.

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Recording Scanning by Variable Bias or Recording Signal Frequency

Scanned recording of the information across the width of the magnetic tape medium in selective recording tracks is performed to accomplish greater density of information recording. A multi-step recording gap head is employed. The frequency of the bias or the frequency content of the recording signal is varied in relation to the gap distance.

Stationary magnetic transducing head 1, shown in A, records diagonally across magnetic tape 2 viewed in B. Tape 2 moves in the direction indicated by the arrow 3. The recording is combined to small tape areas due to the construction of head 1 and the characteristics of the signal supplied to winding 4.

The gaps G1, G2, and G3 are formed in the head with different gap widths to perform writing of staggered discrete patterns of information 5 across tape 2. The bias frequency supplied at the winding 4 is varied to provide a bias having a frequency of f1 at gap G1, a frequency of f2 at gap G2, and a frequency of f3 at gap G3. The frequency of the bias f1 at the gap together with a suitable recording signal is not sufficient to cause the areas of the tape traversing the gaps G2 and G3 to be saturated. Similarly, the frequency of the bias f2 together with a recording signal is not adequate to cause saturation at the gap G3.

The same effect is accomplished by employing a bias signal having a constant frequency and afterwards varying the frequency of the recording sign...