Passive electric networks for magnetic storage system

Claim 1

ELECTRIC CIRCUITRY FOR RECOVERING INFORMATION RECORDED ON A GIVEN MAGNETIC STORAGE MEDIUM BY IMPRESSING RECORDING CURRENTS ON AN ELECTROMAGNETIC TRANSDUCER FOR RECORDING SAID INFORMATION IN THE FORM OF BINARY DIGITS AT A DENSITY AT WHICH THE REPRODUCTION OF A BINARY DIGIT UNDER CONSIDERATION BY SAID ELECTROMAGNETIC TRANSDUCER IN THE ABSENCE OF SAID CIRCUITRY IS DISTORTED BEYOND UTILIZATION BY BINARY DIGITS STORED ON SAID MEDIUM ADJACENT SAID DIGIT UNDER CONSIDERATION, COMPRISING A SUBSTANTIALLY CONSTANT RESISTANCE PASSIVE ELECTRIC NETWORK HAVING INPUT TERMINALS COUPLED TO SAID ELECTROMAGNETIC TRANSDUCER AND OUTPUT TERMINALS, AND A SUBSTANTIALLY CONSTANT RESISTANCE LOAD COUPLED TO SAID OUTPUT TERMINALS OF SAID NETWORK, SAID ELECTRIC NETWORK HAVING AT LEAST ONE FORWARD ARM COMPRISING A SERIES RESONANT CIRCUIT PEAKED AT A FIRST FREQUENCY F1 CONNECTED IN PARALLEL WITH A PARALLEL RESONANT CIRCUIT PEAKED AT A SECOND COMPONENT FREQUENCY F2 HIGHER THAN SAID FIRST FREQUENCY F1, AND AT LEAST ONE SHUNT ARM COMPRISING CIRCUITS COMPLEMENTING SAID RESONANT CIRCUITS AND CONNECTED TIN SERIES, SAID FIRST FREQUENCY F1 LYING IN ARANGE OF FREQUENCIES BETWEEN 1.0 AND 1.5 TIMES A FUNDAMENTAL FREQUENCY F EQUAL TO THE MAGNITUDE OF THE RECORDED PULSE WIDTH DIVIDED BY THE COMPRESSION FACTOR AND SAID SECOND FREQUENCY F2 LYING IN A RANGE BETWEEN 1.4 AND 1.5 TIMES SAID FUNDAMENTAL FREQUENCY F, THEREBY MAXIMIZING FORWARD TRANSMISSION OF ENERGY AT SAID FIRST COMPONENT FREQUENCY F1 AND MINIMIZING TRANSMISSION OF ENERGY AT SAID SECOND COMPONENT FREQUENCY F2 PERMITTING RECOVERY OF SAID INFORMATION, SAID ELECTRIC NETWORK HAVING SUBSTANTIALLY LINEAR PHASE CHARACTERISTIC IN THE FREQUENCY DOMAIN WHEREBY SUBSTANTIALLY PURE DELAY IS INTERPOSED BETWEEN THE WAVEFORM AT THE OUTPUT OF SAID ELECTROMAGNETIC TRANDUCER AND AT THE INPUT OF SAID CONSTANT RESISTANCE LOAD UP TO SAID FIRST FREQUENCY F1.