Data detection level adjusting circuit for processing signal in

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit

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360 49, G11B 509

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active

058385096

ABSTRACT:
A circuit for variably adjusting a data detection level for processing a read signal picked-up from a magnetic disk. The circuit includes a pulse detecting unit for detecting an amplitude peak of a read signal picked-up from the magnetic disk, comparing the read signal with a preset data detection level, and detecting an amplitude peak corresponding to real data among the detected amplitude peaks as output data; a dynamic detection level generating unit for generating a dynamic detection level voltage having a level varying in correspondence with a level of the read signal; a fixed detection level generating unit for generating a fixed detection level voltage having a preset constant level; an interval detecting unit for detecting from data detected by the pulse detecting unit an interval where a transducer head is positioned on the magnetic disk and discriminating a servo information interval and a data information interval; and a switch unit for selecting one of outputs of the fixed detection level generating unit and the dynamic detection level generating unit in correspondence with an interval detected by the interval detecting unit and providing the selected voltage as a data detection level.

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