Cyclical servo zone tracking method and apparatus for helical sc

Details Cyclical servo zone tracking method and apparatus for helical sc Cyclical servo zone tracking method and apparatus for helical sc

1987-05-11

1989-06-27

Psitos, Aristotelis M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

360 7308, 360 70, G11B 15467, G11B 5588

Patent

active

048434957

ABSTRACT:
A tracking system and method are disclosed for a helical-scan recording device to automatically maintain the recording/playback heads in alignment with the stripes of recorded information on the magnetic tape. Each stripe on the magnetic tape includes a servo area having four distinct zones. An analog servo signal at a preselected frequency is recorded on one of the four zones on each stripe and is recorded at different ones of the four zones in succession on each group of four adjacent stripes. The servo signal recorded on the stripes is detected during playback and processed to maintain the desired head positioning relative to the stripes on the tape. The servo head is preferably maintained between adjacent stripes on the magnetic tape and signals detected from each of the adjacent stripes maintain head alignment by shifting the positioning of the head in either direction as needed.

REFERENCES:
patent: 4044388 (1977-08-01), Metzger
patent: 4402023 (1983-08-01), Hiraguri
patent: 4528605 (1985-07-01), Hiraguri
patent: 4544966 (1985-10-01), Taniguchi et al.
patent: 4665447 (1987-05-01), Odaka
patent: 4679098 (1987-07-01), Williams et al.
IBM-TDB, vol. 18, No. 10, Mar. 1976, R. K. Oswald, Track Following Servo System, pp. 3424-3425.
IBM-TDB, vol. 19, No. 3, Aug. 1976, Lewkowicz et al., Tri-Bit Servo Detection, pp. 810-813.

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