发明名称 |
Sampled amplitude read channel with simplified sequence detector matched to partial erasure |
摘要 |
This invention provides apparatus for reliably and efficiently reading data from a magnetic storage medium under the condition that adjacent magnetization regions are partially erased. A simplified nonlinear description of a read signal resulting from such partially erased magnetization regions is used to derive a state machine model of the read signal. The state machine model implicitly defines a sequence detector for demodulating recorded data from received samples. For a PR4 signal, the state machine has ten states; for an EPR4 signal, the state machine has eighteen states; and for an EEPR4 signal, the state machine has twenty-six states. The PR4 machine is further simplified using squaring and state sharing to provide state machine models with six and four states.
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申请公布号 |
US5862161(A) |
申请公布日期 |
1999.01.19 |
申请号 |
US19960697694 |
申请日期 |
1996.08.28 |
申请人 |
CIRRUS LOGIC, INC. |
发明人 |
REED, DAVID E.;BEHRENS, RICHARD T. |
分类号 |
G06F11/00;H03M13/00;(IPC1-7):G06F11/00 |
主分类号 |
G06F11/00 |
代理机构 |
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