Method and apparatus for synchronizing timing signals for helica

Details Method and apparatus for synchronizing timing signals for helica Method and apparatus for synchronizing timing signals for helica

1989-11-09

1991-11-12

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 721, 360 7713, G11B 2104

Patent

active

050652613

ABSTRACT:
Method and apparatus are provided for developing a digital timing signal indicative of when a head of a helical scan recorder (30) is positioned over a recorded stripe on magnetic tape (32). The method involves rotating a drum (36) upon which a head is mounted while the magnetic tape (32) is transported past the drum at a speed greater than the nominal speed at which stripes were recorded on the tape. Given the geometry of the system and format of the tape, the head is eventually able to recognize a pattern of digital data. The timing of the recognition of the pattern of digital data is used to determine the precise time, relative to each rotation of the drum (36), that the head ceases to traverse a stripe and the precise time during each rotation of the drum that the head begins to traverse a stripe. The determination of the edges of the digital timing signal is repeated upon every rotation of the drum (36). A servo timing signal for a servo head (also mounted on the drum) is generated in ninty (90) degree phase relationship to the digital timing signal.

REFERENCES:
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patent: 4835628 (1989-05-01), Hinz et al.
patent: 4843495 (1989-06-01), Georgis et al.
patent: 4845577 (1989-07-01), Georgis et al.

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