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Sampled amplitude read channel with simplified sequence detector matched to partial erasure
Sampled amplitude read channel with simplified sequence detector matched to partial erasure
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机译:具有简化的序列检测器的采样幅度读取通道,与部分擦除匹配
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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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