Abstract: The instant invention relates to the phasing of digital trains containing identical data signals and clock signals of the same frequency. A data testing device compares the coincidence of the bits by packets of bits contained in the signals for emitting a signal (NoCo), if there is at least one non-coincidence in a packet. The testing device delivers a poor base relation signal (ABSCORR) after q non-coincidences. If the testing device has not delivered any non-coincidence pulse for a time t.sub.1, a phase discriminator delivers a phase non-matching signal (ABSPHA). A phase change demand signal (PAP) is delivered by the testing device either upon appearance of the signal (ABSCORR) or the signal (ABSPHA).The invention is appropriate for switching purposes in microwave link transmission.

Abstract: A signal in HDBn code is transmitted with an auxiliary binary signal having a lower bit-rate on a digital transmission line. The HDBn code signal comprises predetermined sequences each including n+1 elements, n-1 central elements being zeros and a last element being a bipolarity violation mark. In each sequence of the HDBn code signal transmitted during each of binary elements of the auxiliary signal having a predetermined binary state, a bipolar mark in the sequence is permutated with a zero element having a predetermined rank in the sequence to derive an encoded sequence. The HDBn code signal is an information signal in the transmission line and the auxiliary signal can be a signal for remotely locating the repeater in the line from a monitoring end equipment of a monitoring system or for indicating performance factors of the repeaters, such as error rates, to the monitoring equipment.

Abstract: This invention relates to manufacturing a grooved cylindrical core by extrusion. The manufacturing device comprises a single rotating integral die that has a tapered rear portion and a grooved cylindrical front portion. The tapered portion surrounds a stationary central member and guides the material from a main extruder. The front portion has a bore including linear or helical channels. The sealing problems are obviated since the tapered portion and the grooved portion make up an integral die. This die further enables to produce a grooved core perfectly gauged. According to another aspect, the threads or stripes between core grooves are identified by means of auxiliary extruders feeding predetermined die channels with extrusion materials having different colours. This stripe identification is particularly used for a core constituting the central strand of an optical cable.

Abstract: A passive homing system for missiles is provided having at least three interferometric bases each comprising two electromagnetic antennae disposed on the missile. Said three interferometric bases have respective mid-perpendicular planes which are inclined two by two at 120.degree. with respect to each other.

Abstract: The process consists in guiding the missile firstly by an electromagnetic guidance by interferometric bases up to the proximity of the target, then by infrared guidance up to the target. Electromagnetic guidance is effected by maintaining constant the angle (.alpha.) between the velocity vector (V) of the missle (E) and the straight line (R") passing through the missile (E) and the projection (C") of the target (C) on the earth (S). The process is particularly applicable to the interception of targets travelling at low altitude above the sea.

Abstract: A parallelepipedic detection wafer of type p made of Hg Cd Te is taken, islets or raised zones are formed from the front face and their structure is rounded, zones of type n are diffused from the front face, in order to form junctions, metallic contact terminals are formed from the front face up to the bottom level of the raised zones, the detection wafer is thinned from the rear face, the terminals are isolated, the pieces of raised zones are attached by the rear face on a processing wafer and the terminals are welded on metallization zones of the processing wafer. The invention enables an infrared detector for camera to be manufactured.

Abstract: Ends of optical fibers spaced around an axially symmetrical structure are arrayed by a device including an integral thin dividing member substantially disposed transversely to the structure. The dividing member has openings and dead-end channels communicating with the openings. The channels are substantially perpendicular to the structure and have bottoms aligned along a fiber end alignment axis. The fiber ends freely pass through the openings and are pushed substantially perpendicularly to the structure from the openings to the bottoms of the respective channels to array the fiber ends along an alignment axis.

Abstract: Device for determining the orientation of an axis, mobile about a point, of a solid in rotation about this axis, particularly a gyroscopic spinner, wherein said device comprises a portion of sphere centered on said point of said axis, of which the surface comprises at least two parts which are respectively absorbent and reflecting for a given radiation, and sensor means sensitive to the radiation reflected by the sphere, the reflecting and absorbent parts being shaped so that the sensor means deliver signals characteristic of the orientation of said axis.

Abstract: Device comprising an inlet duct for a gaseous refrigerating fluid under pressure connected to a choke opening into a fluid expansion and liquefaction chamber connecting with a refrigerating fluid discharge passage which exchanges heat with the said inlet duct, characterized in that, for the pressure range involved, the minimum opening (15) of the choke (10) and the heat exchange relationships with the inlet duct (7, 8) are such that in the minimum opening operating phase a liquefaction phase arises in the inlet duct upstream of the choke, so producing self-regulation producing the fluid flow just necessary to maintain liquefaction in the expansion and liquefaction chamber.

Abstract: A device for measuring the pressure of tires, particularly for aircraft, comprising a passive sensor adapted linearly to convert a variation in pressure into an electrical information variation, in situ, means adapted to convey the electrical information from the sensor to the cockpit of said aircraft, a self-oscillator whose oscillation frequency is controlled by the value of said electrical information from the sensor and means adapted to convert the signal issuing from said self-oscillator into a D.C.

Abstract: Machine for finishing magnetic half-pots which have, on the open side, side edges for assembling half-pots together and a center part designed to be machined to create a preset air gap for the pot core assembly, by use of a grinding wheel projecting through a reference plane supporting the side edges of the half-pots. The half-pots are fed in front of the wheel and pressed onto the reference plane by a flexible support wheel engaging directly with the bottom of each half-pot to form a back support for grinding.

Abstract: Process for obtaining a homogeneous layer of composition Hg.sub.1-x Cd.sub.x Te, comprising the steps of:subjecting a wafer formed by a layer of Hg.sub.1-x.sbsb.o Cd.sub.x.sbsb.o Te deposited by epitaxial growth on a CdTe substrate, x.sub.o being less than the desired value x, to a melting treatment,then rapidly cooling the wafer.

Abstract: System for guiding a missile in a direction of sight, comprising, at emission, a source of emission producing a light beam of which the axis defines the direction of sight and a device for modulating the beam emitted, and, on the missile, at least one photodetector and a processing circuit for determining, from the output signal from the detector, at least one coordinate of the missile with respect to the direction of sight, said coordinate being applied to the control surfaces of the missile in order to control the path of the missile on the direction of sight. The modulation device comprises a sight in the form of a band comprising repetitive motifs, a movement of translation at constant speed being created between the beam and the sight, in a direction perpendicular to the axis of the beam, each motif comprising opaque and transparent parts, the opaque and/or transparent parts having a length (measured in the direction of displacement) which varies according to the height in question.

Abstract: The photodetector comprises a silicon substrate with high sensitivity, a diffusion layer defining a PN junction, and a CdTe layer, as filter, placed on the face close to the PN junction, for stopping radiations of wave lengths shorter than 0.8 .mu.m. The photodetector is suitable for detecting radiations of AsGa diodes used in optical telecommunication systems.

Abstract: Device for regulating a Joule-Thomson effect refrigerator comprising an inlet duct for a refrigerating fluid under pressure to which a choke is connected which opens into an expansion and refrigeration chamber connecting with a passage for heat exchange with the said inlet duct, this choke being regulated to provide a decreasing flow as the refrigeration temperature drops by applying differences in the coefficients of expansion of the components making up the device, characterized in that the said choke, for this purpose, consists in a tubular body (8) connected to the said inlet duct (4) and in which an inner body is held (9, 9a), providing a passage cross-section in it which is regulated by the difference in the coefficients of expansion of the materials making up these two bodies.

Abstract: A process for preparing layers with a superficial composition of Hg.sub.1-x Cd.sub.x Te comprising the steps of producing a wafer by forming a layer of superficial composition Hg.sub.1-y Cd.sub.y Te on a substrate of CdTe, y being less than the desired value x, and subjecting this wafer to a thermal interdiffusion treatment at a temperature of between about 350.degree. and about 750.degree. C., under such conditions that the layer of Hg.sub.1-y Cd.sub.y Te cannot decompose.

Abstract: System for guiding a missile, comprising a source emitting a light beam of which the axis defines the direction of sight, at least one modulation sight placed in the path of the beam, means for producing a relative movement of rotation between the sight and the beam, and on the missile, at least one detector and a calculating circuit for determining, from the output signal from the detector, the coordinates of the detector with respect to the direction of sight.The control surfaces of the missile are actuated as a function of said coordinates with a view to controlling the path of the missile on the direction of sight.The modulation sight comprises transparent and opaque, and possibly semi-transparent sectors, defined by curves symmetrical with respect to the center of the sight, at least certain of these curves having for equation f (.rho., .theta. modulo .pi.)=O, where .rho.varies monotonically as a function of .theta.

Abstract: The system comprises two terminal stations connected through a two-wire transmission line including bidirectional repeaters. The duration of each half-duplex cycle between successive emissions of two digital packets from a terminal station is independent of the length or range of the line. In particular, the half-duplex cycle duration is less than the transmission duration of two packets along two opposite transmission directions for a line having a great length. The system is characterized in that at least one of repeaters comprises a memorizing circuit for delaying each packet which is received along one of the transmission directions, with at least two times the duration of a packet, thereby retransmit it after the transit of another packet along the other transmission duration through the repeater.

Abstract: A digit rate reducing system for PCM signals comprises a predictor stage, an automatic gain control stage, and a quantizer stage for adaptive quantizing. The predictor stage includes a predictor and a subtractor for subtracting from a sample x.sub.n of the PCM input signal a predicted signal x.sub.pn derived from preceding samples. The subtractor provides a difference signal d.sub.n representing prediction error to the automatic gain control (AGC) stage. A divider in the AGC stage divides the difference signal d.sub.n by m, providing a divided signal e.sub.n to the quantizer stage. In this last stage, a quantizer encodes the divided signal e.sub.n into a signal Y.sub.n of reduced rate. The predictor uses a first adder which receives the predicted signal x.sub.pn and a reconstituted signal d.sub.n derived from the reduced rate signal Y.sub.n ; a plurality of shift registers and associated multipliers; and a second adder connected to the outputs of the multiplier. Shift registers T.sub.1 . . . T.sub.

Abstract: The system relieves a transmission working line included in a bidirectional digital link having N working lines and P spare lines between two end stations. In response to the detection of a transmission fault on the working line, the switching units of the stations perform a first exchange of order signals via a selected free spare line, and then a first switch-over of the data related to the faulty working line to the spare line. After the faulty working line has been repaired, to prevent continued data transmission along the spare line, a second exchange of order signals triggers a second switch-over so the system reverts to normal operation. The second exchange of order signals takes place along the repaired line while data related to the repaired line continues to be transmitted via the spare line. During the repair of the preceding faulty working line, a relief procedure of a high priority working line may take place via the selected spare line.