International Business Machines Corporation

Alberto M Ramirez

Gerald L Smith

Leland W Ford

Thomas G Van Vessem

Christopher W Zell

In a system for detecting information stored upon a flexible magnetic media that includes a magnetic transducer for producing an analog signal representing stored binary data, comparator means for detecting positive and negative peaks of the analog signal, and voltage threshold means for providing a reference threshold voltage to the comparator which is a precise percentage of the voltage peaks of the analog signal, an improved magnetic recording detection pointer comprising a pulse width discriminator used to monitor the time per peak during which the analog signal exceeds the detection threshold as an indication of marginal data which can be used in conjunction with an error correction system to extend the overall system correction capability.

Magnetic recording detection pointer that measures the time per data

A compact and lightweight power supply particularly suited for use as a high voltage supply capable of switching voltage values in short time. The high voltage output is compared against a desired reference value to produce a difference voltage which is integrated. The integrated difference voltage is converted to recurrent pulses having a corresponding width. The pulses are applied alternately to the opposite ends of a centertapped primary winding of a specially wound transformer characterized by a specially wound secondary winding and an air-gapped E-shaped core linking the primary and secondary windings. The secondary voltage is applied to a voltage multiplier circuit to produce the high voltage output of the power supply.

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Tucson, AZ, United States of America

Alberto M Ramirez