Adaptive automatic scan tracking system

Details Adaptive automatic scan tracking system Adaptive automatic scan tracking system

1985-01-29

1985-10-29

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 102, 360 78, G11B 558

Patent

active

045503516

ABSTRACT:
A servo loop for an automatic scan tracking arrangement for a helical-scan videotape playback machine includes a wideband relatively low-gain portion for fast acquisition and correction of mistracking errors. In order to provide high gain for reducing mistracking which recurs from scan to scan, a second path in the servo loop in parallel with the wideband path includes a commutating filter which accumulates the average error signal generated by the wideband system in a commutating filter and reinserts the averaged error to provide adaptive systematic correction having a comb-like response. This reinsertion reduces the magnitude of the systematic errors which the wideband portion of the servo must correct, and therefore reduces the amount of closed-loop mistracking which repeats from scan to scan.

REFERENCES:
patent: 4151570 (1979-04-01), Ravizza et al.
patent: 4215362 (1980-07-01), Ravizza
patent: 4420778 (1983-12-01), Sakamoto
patent: 4443823 (1984-04-01), Sakamoto
IBM Technical Disclosure Bulletin, vol. 5, No. 1, Jun. 1962, p. 33, "Magnetic Head Positioning", Buslik.
"Get Notch Qs in the Hundreds", by Mike Kaufman, published Aug. 2, 1974 in Electronic Design 16, pp. 96-101.

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