Index signal generation timing control system

Details Index signal generation timing control system Index signal generation timing control system

1987-09-24

1989-05-16

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Core

324208, 324102, 324174, 328110, 307358, 360 9901, G11B 1518

Patent

active

048314684

ABSTRACT:
An index signal generation timing control system of this invention comprises a rotation signal generating section which generates a rotation signal representing the rotational state of a customer engineer (CE) disk set on a spindle. A burst signal generating section generates a burst signal from burst data written on the CE disk. A measuring section measures the time from time when an index signal becomes active to time when the burst signal is generated by the burst signal generating section. A calculation control section subtracts a predetermined time from the measured time and determines delay time data corresponding to the subtraction result. The determined delay time data is written in memory at the address that is generated in accordance with a write control signal from the calculation control section. When the rotation signal is generated by the rotation signal generating section, the index signal is generated by an index signal generating section with a delay based on the delay time data stored in the memory.

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patent: 4431916 (1984-02-01), Couch
patent: 4535289 (1985-08-01), Abe et al.
patent: 4609869 (1986-09-01), Metcalf
patent: 4694200 (1987-09-01), Hetyei
patent: 4769597 (1988-09-01), Sano

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