Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1997-09-05
2000-08-22
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 7708, G11B 509, G11B 5596
Patent
active
061081531
ABSTRACT:
A servo demodulator (20) is provided for generating a track identification signal (148) and a position error signal (150) from a servo wedge signal, such as a filtered servo wedge signal (112), in response to the processing of the servo wedge signal by a read channel (18). The servo demodulator (20) includes a servo clock generation circuit (90), a position error signal circuit (92), and a track identification circuit (76). The servo clock generation circuit (90) generates a synchronous servo clock signal (102) in response to receiving a servo reference clock signal (110) and the filtered servo wedge signal (112). The synchronous servo clock signal (102) is provided to the read channel (18) for use in processing the servo wedge signal. The position error signal circuit (92) generates the position error signal (150) in response to receiving the synchronous servo clock signal (102) from the servo clock generation circuit (90) and a synchronously sampled servo wedge signal (114) from the read channel (18). The read channel (18) generates the synchronously sampled servo wedge signal (114) by using the synchronous servo clock signal (102) to synchronously sample the servo wedge signal. The track identification circuit (76) generates the track identification signal (148) in response to receiving a digital servo wedge signal (116) from the read channel (18).
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Brady III W. James
Kim W. Chris
Swayze, Jr. W. Daniel
Telecky Jr. Frederick J.
Texas Instruments Incorporated
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