| 摘要 |
784,127. Acoustic delay lines. ELLIOTT BROS. (LONDON), Ltd. Oct. 26, 1953 [Oct. 24, 1952], No. 26800/52. Class 40 (8). [Also in Group XIX] Apparatus for generating coded trains of electric pulses, e.g. for an electronic digital computer, comprises a length of thin wire, tape or the like of material having an appreciable magnetostriction, input circuits each electromagnetically coupled to one of a number of parts along the wire &c. which parts are spaced apart by distances determined by the product of the time spacing between successive pulse positions in the trains to be produced and the velocity of propagation of acoustic pulses in the magnetostrictive material, means for simultaneously passing a current pulse through one or more selected input circuits, and an output circuit electromagnetically coupled to a further part of the wire &c. which is spaced from an endmost one of the number of parts. As shown, input coils 7 are selectively connected by switches 8 to pulse input terminals 9, so that in response to a pulse 10, a binary number may be generated, in the form of a series-mode pulse train (pulse for " 1," no pulse for " 0 "), in the nickel wire 1 and in the output coil 3 which is connected through pulse-shaping and amplifying circuits 6 both to output terminals 12 and to an input coil 2 coupled to the wire, whereby a closed loop delay line store is formed. Those switches 8 not connected to coils 7 are connected to dummy coils 7a associated with a line 1a thus maintaining a constant load in the input circuits. The portions of wire 1 coupled to coils 2 and 3 may have a standing magnetization produced by e.g. permanent magnets such as 13, solenoids or remanent magnetization in the wire itself. The functions of coil 2 may be performed by the leftmost coil 7. The ends of the wire are received in reflection-suppressing sleeves 4 filled with grease. In a modification (Fig. 2, not shown), the switches 8 connect the coils 7 in parallel to terminals 9. Specification 780,005, [Group XIX], is referred to. |
