Matrix store incorporating noise-balancing

Claim 1

In a store comprising magnetic storage elements arranged in rows and columns in a densely packed array provided with one row selection wire per row and one column selection wire per column and two sense wires, each of which passes through one half of the rows and is connected to a separate input of a summing-type signal detector, whereby the information of a storage element is read by means simultaneously driving the row and the column selection wires associated with said storage element with selection currents in the same sense, and whereby the noise cuased by a first row selection current in a row selection wire on a first sense wire which is associated with the relevant row is balanced by means simultaneously driving a second row selection wire, the latter driving current being in the opposite sense of the column selection current with respect to a storage element on the intersection and having the same direction with respect to the second sense wire associated with the relevant row as the first row selection current with respect to the first sense wire, the improvement wherein the lengths of the sense wires between the storage elements on the intersections of the column selection wires thus driven and the two row selection wires thus driven and the connection terminals of the signal detector, are substantially equal to each other in an electrical sense and pass through the same number of rows of storage elements, and wherein each column selection wire intersects the first and second sense wire at pairs of second intersections (C17 and C157, C37 and C137), each pair of second intersections with the same sense wire having substantially the same length in an electrical sense between each of said second intersections and a first connection terminal of the signal detector being associated with and passing through the storage elements on the second intersections once in a like manner and once in a manner which is unlike to said senSe wire.