936,127. Circuits employing bi-stable magnetic elements. KOBUSAI DENSHIN DENWA KABUSHIKI KAISHA. March 23, 1961 [March 23, 1960; April 16, 1960; July 30, 1960 (3); Oct. 10, 1960], No. 10662/61. Class 40 (9). In a circuit for performing logical operations, the two cores of a pair of magnetic cores are first set to opposite polarities by a current in a setting winding S, Fig. 1c, and are subsequently fed simultaneously over separate windings with (a) a bias signal on windings W sufficient only to bring back the induction in each core to zero, (b) a constant signal on windings Nc and (c) one or more binary signals on windings N 1 , N 2 , N 3 , &c. representing information on which the logical operation is to be performed. The intensity of the constant signal is an odd number of times the intensity of a signal on winding N 1 , N 2 , &c. The cores are read by a current applied through terminals +R,- R to split output windings N 0 , rectifiers D 1 , D 2 or other gates ensuring that the output windings present a high impedance during a writing operation. The output appears as a current I 1 or I 2 on terminal X or #X. In Fig. 6, the reading current Ir in element x appears as I 1 and terminal X or as I 2 at terminal X according to the digit stored. Only I 1 is used to control element y. As shown, the constant current Ic in windings NC is in a negative direction so that a signal current I 1 on terminal X produces an output current at Y when element y is read. Logical sum.-Two elements x, y, Fig. 12a, like the element shown in Fig. 6, feed a third element z. Windings N 1 , N 2 are connected to the X terminal of x and the #Y terminal of y and the circuit gives an output in response to X or Y or both. The constant signal Ic is half the signal current and is positive. Logical product.-If the constant signal of Fig. 12a is reversed the circuit gives an output only in response to X and Y. Other logical combinations of x, x, y, #y can be derived by arrangement of the directions of the windings N 1 , N 2 , Ic or by adding a further input element z. The circuit shown in Fig. 13 derives u in the equation Driving circuits.-The read circuits of a number of circuit elements 1, 2, &c., Fig. 15, are connected in series to a transformer T 3 or T 4 . A resistance capacity arrangement R, C gives the current source a high impedance as seen from the circuit elements 1, 2, &c. The constant current signals may be provided by a similar circuit (Fig. 16, not shown), in which the R, C circuit are replaced by rectifiers.
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