PR4 sampled amplitude read channel employing an NRZI write modulator and a PR4/NRZI converter
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United States of America Patent
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Jul 28, 1998
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N/A
app pub date -
Jul 29, 1996
filing date -
Jul 29, 1996
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Abstract
A PR4 sampled amplitude read channel is disclosed which employs an NRZI modulator for writing encoded user data directly to a magnetic disc storage medium instead of using a conventional 1/(1+D.sup.2) precoder. This avoids the ambiguous initial state of the precoder and allows the read channel to directly control the magnetic flux transitions written onto the disc. Upon read back, a PR4 sequence detector outputs a preliminary data sequence which is converted back into the NRZI domain and then decoded into an estimated user data sequence.
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