Abstract: A self-adapting digital filter having one or more processing modules each possessing a delayed discrete value memory, a coefficient memory, two multipliers-accumulators, a variable-amplitude shift register and a summing circuit with the delayed discrete value memories being addressed in a manner producing fictive shifting of their contents.

Abstract: Concentrator-deconcentrator devices for time-division telephone systems, based on the use of symmetrical time-division arrays arranged in terminal modules comprising subscriber and line connecting units to be served and in central modules which provide the connections between these equipments and the exchange to which the device is connected by ensuring variable concentration and improved security.The device is intended for PCM time-division telephone systems.

Abstract: The demodulator therefore features a multiplexer connected to the different transmission channels. The output of the multiplexer is connected to a sampler-coder, followed by an interpolator, which is itself followed by a phase jump converter and a statistical decision device validating the code conversion result, when a certain number of samples taken in a series of successive samples have a phase jump in the same range of values.

Abstract: The invention relates to simulators, for example, simulators of a ship's bridge and the visual display of the scene as viewed from that bridge. Elementary images are juxtaposed, forming an image of a large angle where, without discontinuity, a moving object appears on several television monitors positioned adjacent one another. The images are read simultaneously from "synthetic images" which are stored in a memory. The moving portion of the image, e.g. a ship, is inlayed in a background or environment image. The image of the object is furnished from a camera which is focused on a model of the object, in the example a ship or ships. There is a synchronization between the delayed line signal of the television camera in relation to the synchronizations of the signals throughout the system.

Abstract: An optical switching system comprising two optical fiber arrays 4 and 5 facing one another. In the space between these two arrays, a propagation mode converter 6 or 7, deflector 9 or 11, a deflector control device 13 or 14 and control logic 15 or 16 controlled by a processor 19 are placed for each fiber.

Abstract: When complete, the network D(p,k,a) comprises N operators each connected to p other operators of the network, p being an even integer. The N operators are located on h generatrices each comprising (P/2).sup.k operators, h and k being any two numbers and h being equal to k+a. An operator of coordinates (i,j), i being the generatrix (1.ltoreq.i.ltoreq.h) on which the operator is located and j being the operator order number (1.ltoreq.j.ltoreq.(P/2).sup.k), is connected directly to P/2 operators Ax (1.ltoreq.x.ltoreq.P/2) of the next generatrix, the coordinates of Ax being ((i+1) modulo h, x+P/2 (j-1) modulo (P/2).sup.k).The invention applies to telecommunications centers.

Abstract: A pulse coherent Doppler radar allows both transmission frequency agility and pulse repetition frequency agility in association with phase encoding which accomplishes the transmission frequency agility by the use of a transmission oscillator, the nominal frequency which may be modified by a microcomputer, a local oscillator, a reference oscillator, and a phase-locked loop having a phase comparator with the oscillator and a mixer for receiving the signals issued by the oscillator and the signal issued by the local oscillator.

Abstract: A hydraulic jack for the controlled displacement of a load, such as a platform used in the training of aircraft pilots, has a servo valve normally settable by an error signal Ve from an actuator including a subtractor followed by an amplifier, the subtractor emitting the error signal as the difference between an externally generated position-control signal Vc and a position-feedback signal Vx sent out by the jack. A monitoring device includes an error detector which generates a safety signal AL disconnecting the servo valve from its actuator whenever the position-feedback signal Vx deviates excessively from a reference signal V'x derived from the position-control signal Vc by means of a simulation circuit whose transfer constant equals, in first approximation, that of the servo system encompassing the jack and the actuator.

Abstract: A clock recovery device for a digital data receiver. This device includes a first register for generating a clock signal having the same nominal frequency as the distant clock signal; a second register for detecting the pulses of the received signals, regenerating these received signals and then generating synchronization pulses, and a third register for retiming the regenerated pulses.

Abstract: A digital filter for shared-time processing on several channels. The filter has several elementary cells (C.sub.1 to C.sub.K), each comprising a read-write memory (M.sub.1 to M.sub.K), a read-only memory (H.sub.1 to H.sub.K), and an arithmetic unit (U.sub.1 to U.sub.K). A page address counter CT.sub.1, a word address counter CT.sub.2 and a weighting coefficient address counter CT.sub.3 are common to the cells. Delayed discrete values are transferred by the relative addressing of the memory words. The filter will find particular application as a half-band extrapolator filter for telephone switching.

Abstract: The modular switching network for time-division telephone exchanges, which may be applied to small-capacity time-division telephone exchanges, is constituted by the direct connection of pairs of subscriber and trunk line connecting units by PCM digital trunks, each connecting unit comprising a concentration-deconcentrator device for serving the subscribers associated with this connecting unit.

Abstract: The switching circuit comprises an interface to the interior which comprises two-way gates which are connected to internal interfaces of other switching circuits of said network, each of said gates comprising a l-input and n-output receive circuit and an n-input and l-output transmit circuit, one input of the transmit circuit being connected to the output of a receive circuit different for each of the n inputs, and the input of each receive circuit of a gate being connected to the output of the transmit circuit of a gate of another switching circuit of said network.

Abstract: A telephone set line circuit ringing current injection device having a hybrid circuit in which each feed wire is connected in series with a resistor, and a stage consisting of a diode connected in parallel with the collector-to-emitter circuit of a transistor. The cathode of one diode is connected to the collector of the transistor on the side of one of the feed wires, the anode of the other diode and the emitter of the other transistor are connected to the other wire.

Abstract: A circuit for monitoring the operation of a time-division switching network, in particular, a circuit for checking the continuity of the switching network speech paths during actual communications.The circuit includes a plurality of monitoring Groups (I, II . . . N) which operate simultaneously under the control of a microprocessor. Each monitoring group is connected to all the incoming trunks via a synchronization and multiplexing circuit and to selected ones of the outgoing trunks, via a multiplexing circuit.The invention is applicable to telephone exchanges.

Abstract: The invention relates to automatic outgoing and incoming channel balance and separation circuits between local telephone set lines and network junctors. The separation circuit associated with the telephone set lines possesses an electronic line feed circuit and a separator constituted by an operational amplifier whose output is connected via two equal resistors in series to one of the outputs of the electronic supply circuit, the junction of these two resistors being connected to the output of this separation circuit. The separation circuit associated with the junctor possesses two input amplifiers connected to the network via output resistors of equal value, one terminal of one of these output resistors being connected via a passive resistive and capacitative network to an operation amplifier, and the other terminal of this resistor being connected via a single resistor to this operational amplifier.

Abstract: This invention relates to digital devices for spectral analysis.Signal x(t) of spectrum X(f), sampled at frequency 1/T and encoded, is processed by a temporal digital filter having a width NT followed by one or more perfect digital resonators in parallel, each tuned to a specific predetermined frequency f.sub.p and possessing two outputs, one being the "sine" output and the other being the "cosine" output on which the digital signals X(f.sub.p) sin 2.pi.f.sub.p kT and X(f.sub.p) cos 2.pi.f.sub.p kT are obtained after time NT, from which the value X.sup.2 (f.sub.p) can be formed by conventional digital processing.Application to encoded multifrequency signal receivers used in telephone switching.

Abstract: The invention relates to methods and apparatus for demodulating a differentially phase-modulated digital input signal to produce an output signal representing the digital signal corresponding to the transmitted message.The process comprises memorizing the last two digital samples of the input signal received, computing the series of digital sample phases of the input signal, before and after the last change of the input signal's initial phase, and then substituting for the difference between two phases having the same order number, the corresponding group of output signal bits.Applicable in differentially phase-modulated signal transmission systems.

Abstract: A single motor 25 simultaneously drives two pump elements mounted on its shaft ends. The hydraulic circuit, the motor and the pump elements are contained within a one-piece 3-part assembly comprising a central part 2 placed between two end parts 1 and 3. It is merely necessary to change the relative orientation of one of the end parts, the movable part 1, through 180.degree. in order to couple the two pump elements in series or in parallel as required. The pumping device operates immersed.Suitable for several applications to meet domestic and light industrial requirements.

Abstract: The invention relates to the simulation of an aircraft's flight controls and particularly the mechanical reactions produced on the pilot's controls.The reaction force is produced by a servo-controlled, hydraulic actuator whose piston moves a distance X which is proportional to the deflection of the pilot's control. A servo signal, whose amplitude is proportional to the component of the reaction force depending on the displacement X, is obtained by digital calculation, filtering and analogue multiplication.The invention can be applied to flight training systems and to artificial feel systems (AFS).

Abstract: A multifrequency code receiver for signals consisting of the sampled and encoded sum of q sinusoids of amplitudes A.sub.f, whose frequencies f are regularly spaced apart by .DELTA.F.sub.i =p.DELTA.F.sub.O (.DELTA.F.sub.O being a divisor of the sampling frequency F.sub.E) the receiver possessing a heterodyne device transforming each value f into F.sub.L -f, a multiple of .DELTA.F.sub.O, a counter counting up to r, where r=F.sub.E /F.sub.T, F.sub.T being the divisor of F.sub.E greater than (q-1).DELTA.F.sub.i, filtering circuit, a fast Fourier transform (FFT) computer for N.sub.T =F.sub.T /.DELTA.F.sub.O samples producing the amplitudes A.sub.f.