Electronic Processors, Inc.

Donald F Lynch

A method and system provide for the compensation of peak shift of digital data recorded on D.C. premagnetized (erased) magnetic media. D.C. erasure results in the entire magnetic medium being aligned (polarized) in a single direction. The subsequent magnetic recording of data on such premagnetized medium normally results in a peak shift whenever the subsequently recorded signal traverses in the same direction of polarization as the single polarized direction of the D.C. erased medium. Such peak shift is compensated for in the present invention by utilization of a compensation circuit which, upon the receipt of an encoding signal which would cause data to be recorded which would traverse (be polarized) in the same direction as the premagnetized medium, is activated to provide a modified encoding signal to vary the placement of the magnetic boundaries of the recorded signal to compensate for its anticipated peak shift. The compensating circuit of the present invention is intermediate the source of the data encoding signal and the magnetic write head transducer. The compensating circuit of the present invention may either delay the return transition of the magnetically recorded signal, or cause the switching transition to be written earlier.

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Littleton, CO, United States of America

Donald F Lynch