DocumentCode :
997394
Title :
Simultaneous and orthogonally interactive clock recovery and D.C. null equalization in high density digital magnetic recording
Author :
Huber, W.D.
Author_Institution :
IEEE TMAG
Volume :
19
Issue :
5
fYear :
1983
fDate :
9/1/1983 12:00:00 AM
Firstpage :
1716
Lastpage :
1718
Abstract :
A detection system for saturation digital magnetic recording is described and analyzed which consists of two simultaneously operating feedback loops whose error signals are interactive, but orthogonal to one another so that stability is readily achieved. The technique involves the generation of two error signals, namely (1) phase, and (2) D.C. offset. Thus, both the horizontal (time) and vertical (offset) errors in the system\´s decision thresholds are theoretically forced to zero in steady state since both feedback loops are third order. Thus, the entire magnetic "read"/"write" channel is fully equalized including the DC null. In the more conventional "read"/"write" channels, the "read" detection process occurs before and is independent of the subsequent clock recovery process resulting in a significant sacrifice in theoretically achievable overall performance.
Keywords :
Equalizers; Magnetic recording/recording materials; PLLs; Phase-locked loop (PLL); Bandwidth; Clocks; Detectors; Digital magnetic recording; Feedback loop; Filtering theory; Magnetic recording; Pulse width modulation; Servomechanisms; Signal processing;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1983.1062669
Filename :
1062669
Link To Document :
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