Abstract: When telecommunications systems with analog and digital circuit technology are interconnected, the two-wire/four-wire transitions are achieved with hybrid circuits in which mismatches cannot be avoided. They result in signal reflections in the form of interfering echoes which can considerably reduce speech intelligibility. The known methods of echo compensation for hands-free facilities are not suitable for compensating line echoes, since the signal level and the delay times of lines can be very different. A compander (3.7) is used to suppress the effect of line echoes, whose transmission characteristic, in addition to being controlled by a coupling factor between the transmit path and the receive path, and by a control signal determined by the noise level, is also controlled in the invention with the speech level that is received from the distant subscriber.

Abstract: In a method of regulating a rotating machine with n phases fed with alternating current by a voltage inverter including n SPmLL defining m.sup.n states V.sub.i (i.epsilon.{1, . . , m.sup.n }) of the stator phase voltage vector V.sub.s, the machine having an electromagnetic torque T.sub.em and a stator flux .phi..sub.S slaved to a commanded electromagnetic torque T.sub.emref and stator flux .phi..sub.Sref, for transient conditions in which the electromagnetic torque T.sub.em and/or the stator flux .phi..sub.S are respectively far away from the commanded electromagnetic torque T.sub.emref and/or stator flux .phi..sub.Sref, from all possible states V.sub.i of the stator phase voltage vector V.sub.s, the one is chosen which is optimal for causing the torque T.sub.em and the stator flux .phi..sub.S to converge towards the commanded torque T.sub.emref and stator flux .phi..sub.Sref ; and switching of the SPmLL corresponding to the chosen state of the phase voltage vector V.sub.s is commanded.

Abstract: An assembly of electronic modules comprises electronic modules supported by a support structure. Each electronic module is in the form of electronic components stacked on at least two levels which are separated by an intermediate layer. Each electronic module comprises at least one hole formed in the intermediate layer. The support structure comprises at least one rod element that is introduced into respective holes of successive modules.

Abstract: The composition is constituted by a mixture comprising a thermoplastic material, a hydrolysable silane compound, an elastomer, and a peroxide, said thermoplastic material and said silane compound carrying respective groups that react with each other. The composition including a filler containing superficial hydroxyl groups. The composition is suitable for sheathing electric cables and wires.

Abstract: Creation of a digital ISDN server for distribution and interactive services in video telephony, which can be used for a great number of video telephones including video telephones of different designs. Provision of video and audio signals with different formats and different transmission rates for different video telephones. Signalling of a terminal (TN1, . . . , TNp) is provided by the server for each requesting video telephone, where coded video and audio signals of different transmission rates and different formats are provided according to the design of the video telephone. These are available either in real time or are downloaded from corresponding storage media. In addition, an interactive control can be implemented.

Abstract: A method for automatically changing software version in a computer system comprising a plurality of stations that are to execute in parallel a plurality of replicas of the same software. A series of successively messages, communication protocol, between a master station and each slave station required for initializing and making necessary preparations at each of the slave stations prior to the version-change actual issued. In this way, without human intervention, all of the stations ensure that do restart after receiving the version-change order do indeed all restart actually executing the new version.

Abstract: Optical pulses carrying information to be conveyed are routed, for each pulse, by the intensity of the pulse. The pulses may be solitons. The invention is particularly applicable to long distance communications.

Abstract: A method to realize synchronization in a receiver (RX), of data (DAT) sent from a transmitter (TX) to the receiver (RX), with a signal (SIG) available in the receiver (RX). The method includes the following steps:in the receiver (RX) generating trigger signals (T) from the signal (SIG) available in the receiversending the trigger signals (T) from the receiver (RX) to the transmitter (TX); andupon receipt of the trigger signals (T) by the transmitter (TX) sending the data (DAT) from the transmitter (TX) to the receiver (RX).

Abstract: A wavelength converter is disclosed having a Sagnac interferometer (NOLM, nonlinear optical loop mirror) as its essential part. In order that the wavelength converter can also be used for NRZ (nonreturn-to-zero) signals, it has a 3.times.3 coupler (2) with six ports (6-11).

Abstract: The invention concerns a method of operating a broadband link for the exchange of data (DAT) between a mobile terminal (MS) and a network-side mobile radio facility (MSC), as well as the mobile terminal (MS), the network-side mobile radio facility (MSC) and a mobile radio system. Two or more radio channels to the mobile terminal (MS) are established and assigned as subchannels (C1 to CN) to the broadband link. The data (DAT) are then transmitted via the subchannels (C1 to CN) between a terminal-side entity (ENMT) and a network-side entity (ENNET) of a communications layer (L2), where the entities (ENMT, ENNET) exchange the data (DAT) as data packets (FRDAT1, FRDAT2) in accordance with a transmission protocol, and control the distribution of the stream of data packet to the subchannels (C1 to CN) as well as its recombination. The protocol (PROT) defines and supports two or more different packet types for transportation of the data.

Abstract: A method of performing cellular digital radiocommunications in a TDMA system implemented within a network of geographical cells through which mobile stations (SM1 to SM22) travel, a base station being associated with each of the cells, a mobile station communicating via the base station that is associated with the cell in which the mobile station is located. Each each of the frames in the up transmission direction, from the mobile stations to the base station, contain at least one shared time slot (IT6) which is allocated to at least two distinct mobile stations (SM7 to SM22). For each shared time slot (IT6), the system has a list (31) of the active mobile stations, an active mobile station being a mobile station to which the shared time slot is allocated, and which satisfies at least one predetermined selection criterion.

Abstract: An optical cable has a core containing optical fibers, non-metallic peripheral reinforcements to armor the cable and a thermoplastics material outer sheath. It is fabricated by a method including successive steps of applying reinforcements to the core, extruding the sheath over the reinforcements and cooling the cable. The reinforcements are extruded onto the core as it moves through a first extruder. The combination of the core and the reinforcements is then cooled in a first cooling tank. The sheath is extruded in a second extruder downstream of the first, after which the cable is cooled in a second cooling tank downstream of the first.

Abstract: An electric and/or optical submarine cable arrangement which bridges the weight/strength gap that exists between armoured and unarmoured cable. A stranded armour layer (6) comprises alternate strands of steel wire (7) and polymeric filler (8). Such a cable has sufficient strength to support a section of heavy armoured cable joined to it during laying in water of a depth exceeding 2 km, but light enough that an unarmoured cable can support it in deep water.

Abstract: A resonator (1) for electromagnetic waves with a stabilizer can, for example, be part of a mode-coupled fiber laser. The stabilizer (2) is provided to stabilize the effective length of the resonator (1). Stabilization is accomplished in a first embodiment via two temperature controllers (3, 4) controlling the temperature of a first portion (L1) and the temperature of a second portion (L2) of the resonator (1). The temperature of the second portion (L2) is controlled as a function of an error signal generated by deviations of the resonator (1) from a nominal length. The second portion (L2) is significantly shorter than the first portion (L1).

Abstract: An integrated optoelectronic semiconductor component is presented, which can equally process light signals of any polarization direction. Such semiconductor components are used for digital optical telecommunications. The semiconductor component has active (A) and passive (B) waveguide sections, which comprise a number of semiconductor layers (SP) with so-called multiple quantum well structures. The semiconductor layers (SP) are deposited by a process known as selective area growth (SAG). A portion of the semiconductor layers has a lattice constant which is smaller than the lattice constant of a substrate (SUB). This creates a biaxial tensile strain in these layers. The tensile strain is optimized in the active waveguide sections (A) to attain polarization independence. Furthermore a process is described whereby such a semiconductor component can be manufactured.

Abstract: A method of synthesizing a finite impulse response digital filter includes a phase of calculating the impulse response g(t) of an analog filter the transfer function of which is defined by a predetermined bandwidth B, shape factor SF and out-band attenuation level A. The coefficients of the digital filter are extracted by sampling the resulting impulse response. The calculation phase consists in expanding the impulse response into an integer number M of Hermite functions predetermined in accordance with the shape factor SF. The coefficient extraction phase includes sampling of the expanded impulse response after the calculation phase in a time window the duration of which is dependent on the out-band attenuation level A using a sampling period At that is dependent on the bandwidth B.

Abstract: A coupling is presented for coupling two electromagnetic hollow conductors (waveguides) with different cross-sectional shapes. The coupling includes steps (S1-S3) arranged sequentially in the axial direction, having an essentially rectangular cross section and rounded corners as well as different clearances. The dimensions of all steps (S1-S3) are purposely designed so that other modes in addition to the basic mode are able to propagate therein. Because of the dimensions of coupling (3), only modes intended to conduct signals propagate in the joined waveguides, while those which are not intended to conduct signals are essentially cancelled by superposition.

Abstract: A band-pass filter written into an optical waveguide includes at least one Bragg grating creating coupling between two propagation modes. In one version the pitch of the grating is equal to the length of beating of these two modes, to create codirectional coupling for the LP01 and LP0i modes. In another version the grating couples the LP01 mode to any contradirectional radiation mode. The filter includes, at one point at least of the grating, an area in which one half-period of the grating is omitted to create a phase-shift of .pi. between the two coupled modes.

Abstract: A quadrature modulator including two mixers to which two carrier signals are applied and to each of which a modulating signal is applied, output signals of the mixers being applied to a combiner to constitute a modulated signal. A defect estimator for the modulator detects a first signal representative of the instantaneous power of the modulated signal, generates a second signal representative of a reference envelope obtained from the modulating signals, and corrects the amplitude of one of the first and second signals in accordance with the mean amplitude difference observed between this amplitude corrected signal and the other signal. A processor supplies from the observed amplitude difference between the amplitude corrected signal and the other signal, at least one signal relating to the defect.

Abstract: A power converter comprises two main switches connecting an output either to the positive rail or to the negative rail. Two freewheel diodes for maintaining the current in the load, two snubbers and an auxiliary circuit including an auxiliary inductor in series with two auxiliary switches connected between the output and a mid-point of a capacitive voltage divider supplying a median voltage. Any error of the median voltage relative to its nominal value is evaluated and the main switches are additionally commanded, depending on the direction of the error, for a time period dependent on the amplitude of the error, in order to cause an additional current in the auxiliary circuit to correct the error at least in part.