Dynamic magnetic information storage or retrieval – Miscellaneous
Patent
1976-05-27
1978-02-14
Lucas, Jay P.
Dynamic magnetic information storage or retrieval
Miscellaneous
360 26, G11B 543
Patent
active
040743322
ABSTRACT:
A digital circuit and method for measuring magnetic tape skew of magnetic tape units by recording on two channels of a reference tape a digital bit pattern of alternate pairs of zeros and ones.
Digital logic circuitry, which detects this information on a reference tape when read from a magnetic tape unit to be tested, feeds the digital information on one channel to a shift register which is sampled by a clocking signal derived from the other channel. The digital bit pattern indicated at the output stages of the shift register will identify the existance of any excessive lag or lead skew.
REFERENCES:
patent: 3142829 (1964-07-01), Comstock
patent: 3196419 (1965-07-01), Gabor
patent: 3456237 (1969-07-01), Collins
patent: 3566382 (1971-02-01), Niquette
IBM Tech. Discl. Bull., vol. 15, No. 3, 8/72, "Programmed Skew Adjusting Procedure", Sorensen et al., p. 811.
Friedman Norman
Litton Business Systems Inc.
Lucas Jay P.
Rotella Robert F.
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