Method and apparatus for high density digital data magnetic recording

Claim 1

A HIGH DENSITY MAGNETIC RECORDING SYSTEM FOR BINARY INFORMATION INCLUDING THE COMBINATION OF A MAGNETIC RECORDING MEDIUM HAVING A SATURABLE MAGNETIZATION CHARACTERISTIC, MEANS GENERATING AN ALTERNATING SIGNAL REPRESENTING BINARY CODED SIGNAL INFORMATION, A RECORDING AMPLIFIER CONNECTED TO SAID ALTERNATING SIGNAL GENERATING MEANS, A SOURCE OF ALTERNATING CURRENT BIAS SIGNALS, A MAGNETIC RECORDING HEAD, MEANS COUPLING SAID RECORDING AMPLIFIER AND SAID SOURCE OF ALTERNATING CURRENT BIAS SIGNALS TO SAID RECORDING HEAD FOR MAGNETIZING SAID MAGNETIC RECORDING MEDIUM TO A DEGREE LESS THAN SATURATION IN ACCORDANCE WITH SAID ALTERNATING SIGNALS REPRESENTING BINARY INFORMATION, MEANS FOR DERIVING ELECTRICAL SIGNALS CORRESPONDING TO THE MAGNETIZATION ON SAID RECORD MEDIUM, A PHASE AND AMPLITUDE EQUALIZING MEANS COUPLED TO SAID ELECTRICAL SIGNAL DERIVING MEANS, AND A DETECTOR COUPLED TO SAID PHASE AND AMPLITUDE EQUALIZING MEANS FOR PROVIDING AN OUTPUT SIGNAL REPRESENTING SAID BINARY CODED SIGNAL INFORMATION.