Balanced sense line memory

Claim 1

IN A THIN FILM MAGNETIC MEMORY ARRAY OF THE TYPE HAVING ROWS AND COLUMNS OF DISCRETE SPOTS OF MAGNETIC MATERIAL POSSESSING AN EASY AXIS OF MAGNETIZATION IN THE DIRECTION OF SAID ROWS AND IN WHICH BINARY INFORMATION IS STORED AS THE DIRECTION OF REMANENT FLUX ALONG THE EASY AXIS OF A SPOT, INFORMATION SENSING APPARATUS COMPRISING, SELECTION MEANS FOR ROTATING THE REMANENT FLUX OF A SPOT IN A GIVEN ROW, SENSING MEANS COUPLED TO SAID MAGNETIC SPOT IN A GIVEN COLUMN AND RESPONSIVE TO FLUX ROTATION TO PRODUCE AN OUTPUT SIGNAL RELATED TO THE STATE OF REMANENT FLUX IN THE SPOT SELECTED BY SAID SELECTION MEANS, SAID SENSING MEANS BEING COUPLED TO SAID SELECTION MEANS TO PRODUCE A FIRST NOISE SIGNAL INDEPENDENT OF THE STATE OF REMANENT FLUX OF SAID SELECTED SPOT, BALANCING MEANS COUPLED TO SAID SELECTION MEANS TO PRODUCE A SECOND NOISE SIGNAL SUBSTANTIALLY IDENTICAL TO SAID FIRST NOISE SIGNAL, AND A NETWORK TO COMBINE THE SIGNALS OF SAID SENSING MEANS AND SAID BALANCING MEANS TO CAUSE SAID SECOND NOISE SIGNAL TO CANCEL SAID FIRST NOISE SIGNAL PRODUCING AN OUTPUT SUBSTANTIALLY EQUAL TO SAID OUTPUT SIGNAL WHEREBY SAID OUTPUT CORRESPONDS TO THE INFORMATION STORED IN SAID SELECTED SPOT.