G - Physics – 11 – B
Patent
G - Physics
11
B
354/237, 352/19.
G11B 5/09 (2006.01) G11B 20/14 (2006.01)
Patent
CA 1063718
Abstract Apparatus and method for high track density magnetic recording and retrieval. A decoder-coupled five bit shift register converts an incoming data bit stream to a converted data bit stream having successive groups of five bits corresponding to successive groups of four bits of the incoming stream, the con- verted stream having not more than two adjacent binary "1's". A shift register-coupled NRZO encoder provides a self-clocking tri- frequency signal allowing a clocking window margin of one-half a converted bit cell. The tri-frequency signal, applied to an NRZO encoder coupled modulator enhances flux transitions to minimize fringing field effects on adjacent tracks of a magnetic recording medium in a storage system having a track density in excess of about 500 tracks per inch. An amplifier-coupled slope detector detects playback signal slope polarity changes to provide a coded output signal.
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