Servo signal processing apparatus, recorded data reading apparat

Details Servo signal processing apparatus, recorded data reading apparat Servo signal processing apparatus, recorded data reading apparat

1997-12-23

2000-04-18

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 51, 360 65, 360 7708, G11B 509, G11B 5035, G11B 5596

Patent

active

060522445

ABSTRACT:
A servo signal processing apparatus for processing a servo signal corresponding to servo information from a servo area on a recording medium for controlling a head. The servo area includes a servo mark area for storing a servo mark indicative of a head of the servo area, a gray mark area for storing a gray mark indicative of a head of information for position control for the head, and a gray code area for storing information. An A-D converter converts the servo signal to digital data. A digital filter filters the converted data based on a sampling clock, and outputs the filtered digital data. A servo mark detector detects a servo mark based on a continuity of a first predetermined logical value. A gray code decoder detects a gray code based on a continuity of a predetermined logical value. The gray code decoder decodes information stored in a gray code area following the detected gray mark.

REFERENCES:
patent: 5384671 (1995-01-01), Fisher
patent: 5870591 (1999-02-01), Sawada

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