Apparatus and method of reproducing synchronization signal in di

Details Apparatus and method of reproducing synchronization signal in di Apparatus and method of reproducing synchronization signal in di

1994-05-02

1998-03-03

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 51, G11B 5596

Patent

active

057242046

ABSTRACT:
An apparatus and a method of reproducing a synchronization signal in a disc storage system. The apparatus includes disc mechanism having a plurality of information storage discs in one of which a predetermined servo pattern is recorded, and a corresponding plurality of reproducing heads, one of the heads reading the servo pattern from the corresponding disc to thereby output a servo signal, a synchronization signal demodulating unit, responsive to the servo signal from the disc mechanism, for demodulating a synchronization signal in synchronization with a rotation of the discs, a synchronization clock generating unit for generating a clock signal with a predetermined frequency in synchronization with the synchronization signal, and a gate unit. For a predetermined period, the gate unit prohibits a supply of the synchronization signal from the synchronization signal demodulating unit to the synchronization clock generating unit. As a result, it is possible to prevent an erroneous detection of a synchronization signal due to a spike noise, an undesirable signal by a defect of a medium, or the like, and thus realize a precise reproducing of the synchronization signal.

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European Search Report, The Hague, search completed Mar. 10, 1991.

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