Abstract: This invention relates to a switching system for time-division multiplexed PCM channels. The system possesses essentially an incoming time-division switching device, a space-division switching device and an outgoing time-division switching device. The invention proposes to produce these time-division switching devices in the form of memories organized in pages enabling them to be manufactured in the form of hybrid monolithic integrated circuits. Application: time-division telephone switching.

Abstract: A continuous panoramic image seen at infinity from an observation space E is obtained from a prismatic image whose facets consist of alternate and edge-to-edge real images I11, I12, . . . and virtual images I'21, 22, . . . , and by reflection of this prismatic image in a set of sperical concave mirrors MC1, MC2, . . . forming a reflection area.The real images are produced by a first set of image generators M11, M12, . . . The virtual images are the conjugates by reflection in the semi-transparent plane mirrors L1, L2, . . . of images I21, I22, . . . produced by a second set of image generators M21, M22, . . . Amongst other applications, that of ship-control training equipment.

Abstract: A secondary radar system in which the transponder and central station possess for enciphering and deciphering complementary dispersive filters having expansion/compression factors of .theta..DELTA.F.sub.1, where .DELTA.F.sub.1 = 1/.DELTA..mu. is a measure of the spectral width of each reply pulse having a temporal width of .mu., .theta. being at least s .mu./.DELTA..mu., such that at least two adjacent pulses spaced s apart in the initial reply train are completely overlapped in the expanded reply.The application to secondary radar systems, especially of the IFF type, in order to improve considerably the secrecy of the link between an airborne transponder and the ground station.

Abstract: A system for simulating an animated scene useful, for example, in training personnel to dock large supertankers, fire modern weapons, etc. The system uses a pair of identical background transparencies, one of which is used to generate an animation zone including an electronically inlayed image of a moving object. The animation zone is then optically superimposed on the other transparency.