Dropout simulation in a magnetic tape subsystem

Details Dropout simulation in a magnetic tape subsystem Dropout simulation in a magnetic tape subsystem

1991-02-14

1993-12-14

Pascal, Robert J.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 381, H04N 514

Patent

active

052708748

ABSTRACT:
The invention is a magnetic tape subsystem in which dropout can be controllably simulated. Such simulation is accomplished by inserting an electronic filter between the read transducer and a recording channel detector of the magnetic tape subsystem. The filter scales a spacing loss transfer function from a spatial domain to a frequency domain. After selecting an appropriate head-tape spacing, the frequency domain transfer function is computed and the filter is designed. Upon insertion of the filter, dropout is then simulated. Such simulation allows for an assessment of recording channel operation with a particular amount of dropout, including the margin to failure of magnetic tape heads or other components. Because the filter is completely electronic, dropout simulation can be performed in the field for maintenance purposes as well as to test recording channels during their development and manufacture.

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E. C. Klaas, "Testing Magnetic Recording Tape," Nov. 1965, IBM Tech. Discl. Bulletin, vol. 8, No. 6, p. 828.
H. J. Gardner, et al., "Signal Quality Measurements," Oct. 1978, IBM Tech. Discl. Bulletin, vol. 21, No. 5, pp. 1801-1802.
K. H. Jeffries, et al., "Head-Tape Spacing Meter," Jun. 1973, IBM Tech. Discl. Bulletin, vol. 16, No. 1, pp. 269-270.
R. L. Wallace, Jr., "The Reproduction of Magnetically Recorded Signals," Jul. 1951, pp. 1145-1173.

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