Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1993-06-14
1994-10-18
Shepperd, John
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 26, G11B 509, G11B 2020
Patent
active
053573803
ABSTRACT:
A method and apparatus which first calculates track to track skew in a tape device and then uses the results of that calculation to adjust the windows for detection of sync and resync characters. The system makes use of global circuitry which adjusts the sync and resync windows for all tracks based upon the skew calculation. In the case of the windows used for detecting resyncs, when skew is determined to be large, the global resync window must span a larger time period to account for the skew in detecting resync marks. Conversely, when there is little or no skew present, the windows for resync detection can be narrowed. Normally, the track logic utilizes its own local windows to detect resyncs. If a track misses a resync, however, it must use the global resync window to determined the next resync location. Once the tracks are resynchronized, control can return to local track circuitry to maintain synchronization. In the case of force windows used for detecting the syncs after a resync alignment burst, the skew calculation is used to determine the correct sync location for each particular track. Further, data alignment is maintained in the multitrack environment through the use of a deinterleaving circuit which receives misalignment indications and, in response, makes address corrections to data bytes and pointer bytes.
REFERENCES:
patent: 3641534 (1972-02-01), Irwin
patent: 3702996 (1972-11-01), Wolfer et al.
patent: 3771125 (1973-11-01), Nagahori et al.
patent: 3869716 (1975-03-01), Blethen
patent: 4222081 (1980-09-01), Kamo et al.
patent: 4342057 (1982-07-01), LaBeau et al.
patent: 4357702 (1982-11-01), Chase et al.
patent: 4389600 (1983-06-01), Milligan et al.
patent: 4506309 (1985-03-01), Joannou et al.
patent: 4654867 (1987-03-01), Labedz et al.
patent: 4783784 (1988-11-01), Ishiguro et al.
patent: 4932070 (1990-06-01), Waters et al.
patent: 4974189 (1990-11-01), Russon et al.
Bailey Charles E.
Bentley Steven R.
Paranjape Sushama M.
Quintana Fernando
West Stephen C.
Anderson F. E.
International Business Machines - Corporation
Schecter M. W.
Shepperd John
Wamsley Patrick
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