PR4 sampled amplitude read channel employing an NRZI write modul

Details PR4 sampled amplitude read channel employing an NRZI write modul PR4 sampled amplitude read channel employing an NRZI write modul

1996-07-29

1998-07-28

Hindi, Nabil

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

260 51, G11B 509

Patent

active

057869502

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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