Dynamic magnetic information storage or retrieval – General processing of a digital signal – Address coding
Reexamination Certificate
2006-10-24
2006-10-24
Neal, Regina Y. (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Address coding
C360S077080
Reexamination Certificate
active
07126775
ABSTRACT:
A rate ½, d=1 channel code encodes a Gray code servo track address into channel data recorded on a magnetic disk; a d=1 Viterbi sequence detector detects the recorded servo track address upon read back; a cost effective d=1 decoder decodes the recorded servo track address into its Gray code representation; and a 1/1+D filter decodes the Gray code track address into its binary representation. The channel encoding scheme increases the data density of the storage system due to the d=1 constraint and use of the Viterbi sequence detector. Further, the implementation advantageously uses the Viterbi sequence detector already provided in a read channel for detecting user data, and the cost and complexity of the decoder is reduced by encoding/decoding the Gray code track address in sections of five bits.
REFERENCES:
patent: 4984100 (1991-01-01), Takayama et al.
patent: 5274510 (1993-12-01), Sugita et al.
patent: 5384671 (1995-01-01), Fisher
patent: 5739975 (1998-04-01), Parks et al.
“Modulation & Coding for Information Storage”, IEEE Communications Magazine, Dec. 1991 Siegel et al. p. 68-70.
Cirrus Logic Inc.
Lin Steven
Neal Regina Y.
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