Abstract: An apparatus accumulating a filiform element in order to absorb differences in input and output travel speeds of the element, without tangling and damaging the element. Mechanical means located above an accumulation container draw the filiform element at the input speed and wind the filiform element in layers of coils stacked on the bottom of the container following an epicycloid or hypocycloid path. Two stationary concentric rings, respectively, attached to and suspended above the bottom of the container, guide the filiform element unwound at the output speed through the bottom of the container to the outside. The apparatus is particularly designed for a very fine and fragile filiform element such as an optical fiber, and is inserted between a multifibering machine and a cabling line.

Abstract: The camera includes a chip of infrared detectors disposed in lines and a processing chip. The latter comprises integrators for integrating the output currents of the detectors, controlled by an automatic gain control loop for reducing the dynamic of the signal, delay lines, a summator for each line of detectors, error correction devices for reducing the fixed spatial noise errors, and a multiplexer receiving the signals associated with the various lines of detectors and furnishing a signal to a display device.

Abstract: The present invention relates to remote control or trajectory calculation systems for missiles for example, and in particular to a message receiving device which may be mounted on the missle itself.The receiver of the invention comprises means for receiving the j sequences of the message, means for shifting each sequence by a time .DELTA.t.sub.j, means for confirming that the sequences of 1's are indeed associated with sequences of 0's, means for reading the word formed of the j sequences, j being an appropriately chosen integer.The invention applies to radar responder and any transmission carriers.

Abstract: A method is disclosed for preparing a crystalline ingot of Hg.sub.1-x.sbsb.o Cd.sub.x.sbsb.o Te. Before moving a heated solvent zone for progressively dissolving ingot sources and giving rise to a single ingot, an adaptation zone is created from a monocrystalline germ by heating and cooling the solvent in contact with the germ, the ingot obtained is monocrystalline. The method of the invention in particular reduces the manufacturing costs of components such as infrared detectors and avalanche diodes.

Abstract: A method is provided for coding in the CMI code digital information organized in frames, wherein each frame locking word V, chosen equal to 1, is placed in the last position in the frame. The CMI code is violated at the position of said word V and, for keeping the statistics of the coding law, it is arranged for this violation to be alternately 00 and 11, from one frame to another. For this, immediately before the word V is inserted a binary filling word B, chosen by taking into account the number of binary "1"s before filling. If the number of binary "1"s before filling is even, the binary element B is coded like the violation of the frame locking word V and, in the opposite case, B is coded 01.

Abstract: A fiber optic connector comprises a planar holder, such as a printed circuit board, on which a photoelement is secured along a reference axis coaxial with an end of an optical fiber in a transmission system. The holder is secured by mechanical fasteners above a base member. A male member through which the fiber end runs is removably coupled mechanically to a female member integral with the base member such that an endface of the fiber end is opposite an end face of the photoelement along the reference axis. The holder carrying a photoelement, such as a photoreceiver, is positioned with respect to the female member coupled to the male member including the fiber end with the help of a micromanipulator and a dynamic adjustment responsive to an electrical signal derived from the photoreceiver receiving an optical signal transmitted by the fiber end.

Abstract: An addressing device for a memory, such as a dynamic memory ROM or RAM, addressable by address words at a predetermined clock-period rate. Each address word is made up of first and second address words composed of least significant and most significant bits of the address word respectively. The first and second address words are multiplexed. The device comprises an adding circuit for incrementing the first address words in terms of a predetermined digital signal carrying words that are synchronous with the first address words and for incrementing the second address word in each address word by unity whenever the first word of the address word has bits all equal to "1", and a shift circuit looped across the adding circuit in order to deliver the first and second multiplexed address words to the memory.

Abstract: A frequency stabilized pulsed laser system useful for heterodynes telemetry comprises an amplifying medium (21), between a mirror (27) and a four wave mixing phase conjugate mirror (30). The non linear medium of mirror (30) is a part of the laser medium (21), because of the presence of a lens (31). The mirror (30) is pumped by the direct beam of a continuous laser (29) and the reflected beam from the mirror (27). The light emission of the laser exits through an optical isolator (28).

Abstract: The system according to the invention comprises a central microprocessor and peripheral microprocessors. A direct-access transfer memory is provided for the communication of the processors with one another. The memory is divided into as many distinct, determined zones as there are peripheral processors. The memory is connected to two addressing buses of which the latter serves equally well to address the boxes of the memory by the central microprocessor and to address the zones of the memory allocated to the peripheral microprocessors. The system is particularly well adapted to data transfers between a telephone automatic switch and subscribers' sets.

Abstract: A cryogenic device for radiation detectors is provided comprising an enclosure situated between a cryogenic cold finger supporting a detector and an external wall. After a brief degasification under vacuum of said enclosure, at least one gas is therein introduced, whose liquefaction or solidification temperature is higher than the temperature reached by said cold finger.

Abstract: A method and device for inserting a digital signal in a channel at a higher flow rate is provided, for example for transcribing from 704 Kbit/s into 2048 Kbit/s, wherein each binary element of the low flow rate channel is associated with a triplet whose first two bits are identical to the bit to be transmitted, and whose third bit is in the inverse state. Such a triplet is provided for the first ten bits of a sequence of eleven bits, the eleventh bit being associated with a doublet whose two bits are identical to the bit to be transmitted.

Abstract: A device for measuring the heading error of a missile, comprising two afocal systems for a taking-in-charge field PC and a cruising field CR, in front of a double prism, with a central prism and a peripheral prism of the same angle bonded together with their dihedrals opposed. The double prism is in front of a focusing lens in the focal plane of which are disposed four detectors. When one detector sees the PC field, the other detector sees the CR field. An analog switch permutes in a circular fashion a processing device to the PC channel or the CR channel, for delivering missile heading error measurement signals.

Abstract: A device is provided for stabilizing the frequency of an RF excitation laser, comprising a means for matching the impedance of the cavity of the laser with that at the output of the excitation generator. The matching means are connected through a line to a circulator which is connected to the generator and to an RF diode. A synchronous detector is connected to the outputs of the diode and of an oscillator. The output of the detector is connected through an integrator to a piezoelectric ceramic supporting one of the mirrors of the cavity of the laser, modulated by the oscillator. The phase shift between the signal reflected by the cavity and the signal of the oscillator and the amplitude of the former allow the cavity to be stabilized in frequency.

Abstract: The invention relates to a telephone subscriber electronic feeding bridge which includes a transformer with three windings, between the line of the sub set and the connection network of the telephone unit automatic exchange or autoswitch of which it forms a part. A capacitor is interposed on one of the two wires of the line, connected furthermore to feed resistors. The third winding of the transformer, associated with the winding of the line of the set, is looped on a negative impedance. This arrangement allows impedance matching both in direct current and in alternating current.

Abstract: Process for preparing crystals of Hg.sub.1-x Cd.sub.x Te, in which ingots of HgTe and of CdTe are made to pass through a solvent zone, characterized in that it comprises the step of using as solvent a mixture of tellurium, of HgTe and of CdTe in proportions corresponding to thermodynamic balance.

Abstract: This invention relates to digital transmission techniques whereby information produced in asynchronous form, for instance by variable-length coding and/or by conditional coding, is intended for transmission through a synchronous digital transmission path. More particularly, the invention concerns a receiving device comprising a picture buffer memory having a content that can be different from that of a picture buffer memory included in a transmitting device of the system, a circuit for detecting picture line and field synchronizations, a circuit for transcoding video information prior to its writing in the receiving device buffer memory and a circuit for monitoring writing and reading addresses in the buffer memory in terms of the detected synchronizations. A partial decoding of the video information is performed prior to entry in the receiving device buffer memory, and a synchronization of this memory is independent of the content in the transmitting device buffer memory.

Abstract: The invention provides a system for detecting the angular position of a mechanical device.The invention consists in providing the image of a slit of predetermined width on a mirror firmly fixed to said mechanical device and in reflecting the image on a semi conductor receiver comprising an array of photosensitive elements and a charge coupling device, deducing therefrom the angular position of said mechanical device and correcting the reading of the measurement supplied.

Abstract: The present invention relates to the D.C. supply for a subscriber control system, and consists essentially in supplying the control system from the exchange solely in response to a request, such request being emitted either by the exchange or by the control system, a preamble message being emitted in-line by the control system in order to initialize a communication in the latter case. The invention is applicable to the digitalization of the subscriber's telephone.

Abstract: A frame alignment loss and recovery device for a digital signal carrying a frame alignment N-bit word comprises an (N+2)-stage shift register receiving the digital signal at a timing frequency H, a buffer register for extracting (N+2)-bit words from the shift register at a frequency H/3, a logic circuit for comparing each extracted word with three predetermined (N+2)-bit words respectively including N last bits, N central bits and N first bits identical to the alignment word bits in the signal, and a circuit for deriving a frame synchronization pulse in phase with the start of an alignment word contained in an extracted word having bits respectively identical to like-ranked bits in one of the three predetermined words. Because searching for the alignment word is at a frequency H/3, the logic circuit can include conventional PROM memories and alignment word errors can be tolerated despite a digital signal of high rate, for example, 34 Mbit/s.

Abstract: The invention relates to a photoconducting detector in optical immersion, comprising a detector wafer in Hg.sub.1-x Cd.sub.x Te, on a quartz substrate, and a hemispherical lens in CdTe, assembled on each other by a layer of photosensitive resin whose thickness is calibrated by two shims. The detector is advantageously used for the evaluation of targets.