Recording/reproducing system for a magnetic recording medium inc

Details Recording/reproducing system for a magnetic recording medium inc Recording/reproducing system for a magnetic recording medium inc

1988-07-11

1989-03-07

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 61, G11B 2722, G11B 1502, G11B 2016, G11B 509

Patent

active

048111260

ABSTRACT:
A recording/reproducing system is provided with a PLL circuit for outputting data pulses and clock pulses on the basis of the read data reproduced from a magnetic recording medium. An external synchronization detection circuit is provided which detects the synchronization data (predetermined zero pattern data), recorded in synchronization areas of the magnetic recording medium, on the basis of the read data. When the synchronization data is detected, the synchronization detection circuit enables the PLL circuit to oscillate in synchronism with the read data. An internal synchronization detection circuit is provided, which detects the synchronization data (predetermined zero pattern data), as recorded in the synchronization areas of the magnetic recording medium, on the basis of data pulses derived from the PLL circuit and the clock pulses. A preventing circuit is further provided. When address mark data is not detected within a predetermined period of time after the external synchronization detection circuit detects th synchronization data, the preventing circuit prevents the PLL circuit from oscillating in synchronism with the read data.

REFERENCES:
patent: 4553178 (1985-11-01), Lynch
Imamura et al., "Barium Ferrite Perpendicular Recording Floppy Disk", Toshiba Review No. 154, Winter 1985, pp. 18-22.

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