G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 20/10 (2006.01) G11B 20/12 (2006.01) G11B 27/10 (2006.01) G11B 27/30 (2006.01)
Patent
CA 2066177
Method and apparatus are provided for developing a digital timing signal (HEAD SYNC) indicative of when a head (R1) 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 (R1) is mounted while the magnetic tape (32) is transported past the drum (36) at a speed greater than the nominal speed at which stripes were recorded on the tape (32). Given the geometry of the system and format of the tape (32), the head (R1) 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 (R1) ceases to traverse a stripe and the precise time during each rotation of the drum that the head (R1) begins to traverse a stripe. The determination of the edges of the digital timing signal (HEAD SYNC) is repeated upon every rotation of the drum (36). A servo timing signal (SERVO SYNC) for a servo head (S) (also mounted on the drum (36)) is generated in ninty (90) degree phase relationship to the digital timing signal (HEAD SYNC).
Georgis Steven Philip
Hughes Timothy C.
Exabyte Corporation
Kirby Eades Gale Baker
LandOfFree
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