Apparatus for sensing magnetic fields from a wide range of magnetic media
AssigneeEastman Kodak Company
InventorsGregory A. Burg, Frederick R. Chamberlain, IV
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Abstract
Apparatus for reading magnetically stored data from a wide range of magnetic media. The apparatus includes a magnetoresistive MR head for producing a signal representative of stored magnetic data and a hysteresis comparator circuit for processing the signal from high concentration media. The MR head is preferably a paired MR head having a preamplifier circuit which provides the bias current for the PMR head, amplifies the signal produced by the PMR head, and provides rejection of common mode signals.
Claims7
Apparatus for sensing magnetic fields from a wide range of magnetic media, comprising:
- a magneto-resistive read head for producing a signal representative of stored magnetic data;
- and
- a hysteresis comparator circuit for processing said signal produced by said magnetoresistive element.
A magnetoresistive head system for sensing magnetic fields from a wide range of different magnetic media comprising:
- a paired magnetoresistive (PMR) head for producing a signal representative of stored magnetic data;
- a high concentration pulse detector;
- a low concentration pulse detector;
- a multiplexer connected to said detectors;
- and
- a card detector for detecting whether said signal produced by said (PMR) head is from a high concentration media or a low concentration media and for controlling said multiplexer to pass either the signal from said high concentration pulse detector or the signal from said low concentration pulse detector.
Dependencies are inferred from the claim text.