Method and digital circuit for measuring skew of magnetic heads

Details Method and digital circuit for measuring skew of magnetic heads Method and digital circuit for measuring skew of magnetic heads

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.

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