Abstract: A device for monitoring the boron content of the borophosphosilicate, BPSG. The BPSG is obtained by the oxidation of silane, of diborane and of phosphine in a reactor, starting with a first, diborane/silane gas mixture and a second, phosphine/silane gas mixture by monitoring the ratio .rho.=diborane/(diborane+silane) of the mixture resulting from the mixing of the first and second gas mixtures. Monitoring of the boron content is obtained by measuring the density of the first mixture, determining the amount of residual hydrogen in the first mixture and modulating the mass flow rate of the first mixture in response to the calculated ratio .rho..

Abstract: The system comprises an interrogation assembly and a passive responder. One is carried by a mobile and the other by a track. The interrogation assembly includes continuously operating low frequency and medium frequency transmitters. The transmitters have respective antennas directed towards a predetermined zone with respect to the antennas, which is traversed by the responder during movement of the mobile. It further has a unit which is responsive to the characteristics of the responder when the responder is in the zone. The responder has a low frequency reception circuit which controls a medium frequency circuit. Both circuits have radiating circuits which are tuned and the low frequency signal generated in the low frequency circuit is used to short-circuit the medium frequency tuned circuit of the responder, at the rate of low frequency rate.

Abstract: In order to establish a videophone communication from a calling terminal to a called terminal, a communication is established on a first TBCC channel, then a ringing tone is emitted automatically, from the called terminal, to the calling terminal on the first channel and a call is emitted to the telephone set on the second channel B; in response to the unhooking of the telephone handset the two channels are automatically linked from the called terminal; and, in response to a code from the telephone set, the emission is caused of a waiting tone to the calling terminal and a ringing to the called videophone terminal; in the event of acceptance on the part of the subscriber of the called videophone terminal, the establishment of communication is automatically continued in response to the hooking of the set.

Abstract: Each path is identified by a delay which is applied to at least one spreading sequence for determining a correlation between the received signal ans said spreading sequence. For each selected delay, a reception energy, contained in the CDMA signal consisting of a correlation between the received signal and a reference spreading sequence, is estimated. Delays to be tested are randomly chosen with a choice probability having a maximum for a delay substantially equal to the smallest selected delay. The delays thus chosen are tested by estimating the reception energy associated thereto. When the reception energy for a tested delay is greater than at least one of the reception energies associated to the previously selected delays, the tested delay is substituted for the previously selected delay having the smallest reception energy.

Abstract: A method for monitoring the boron content of the borophosphosilicate, BPSG. The BPSG is obtained by the oxidation of silane, of diborane and of phosphine in a reactor, starting with a first, diborane/silane gas mixture and a second, phosphine/silane gas mixture by monitoring the ratio .rho.=diborane/(diborane+silane) of the mixture resulting from the mixing of the first and second gas mixtures. Monitoring of the boron content is obtained by measuring the density of the first mixture, determining the amount of residual hydrogen in the first mixture and modulating the mass flow rate of the first mixture in response to the calculated ratio .rho..

Abstract: The protection device comprises a MOS transistor formed on the substrate of the integrated circuit and connected between a circuit pad and a reference terminal of the integrated circuit. A thyristor formed on the substrate is connected between the pad and the reference terminal. The control electrode of this thyristor consists of a region of the substrate in such a way that the thyristor can be triggerred by a current of charge carriers produced in the substrate by avalanche when a voltage rise occurs between the substrate and the drain of the MOS transistor.

Abstract: The method is for generating a digital multiplex signal for broadcasting. The multiplex is made up of packets of determined length coming from a plurality of sources, by applying a treatment selected from those belonging to a catalog of stored treatments. It is applicable to D2-MAC/packet and digital TV. An encoder implementing the method has sources in which the identity of the treatment to be performed is inserted in a field provided for this purpose in each packet precursor. Downstream from the sources, the encoder comprises a treatment unit for decoding the field and for causing the treatment defined by the field to be applied.

Abstract: According to the method, a physical transmission channel is split into a plurality of logic channels which may be dedicated to different communications. Each logic channel consists of time slots having a same duration and the same rank in successive frames of constant length. At least one of the logic channels is split into a plurality of sub-channels dedicated to different communications. Groups of k successive time slots (k being an integer greater than 1) are allocated to each logic sub-channel. The groups are time distributed in a regular way and k is so selected that N be different from (m.k+1) where m is an integer and N is the number of time intervals necessary for reconstructing an information block.

Abstract: The invention concerns a process for slope etching a layer of an integrated circuit. The layer to be etched is coated with a masking photoresist layer. The process consists of jointly performing a passivation of the etching flank of the layer to be etched and a nonisotropic erosion of the masking photoresist layer, which makes it possible to control the slope of the etching flank of the layer to be etched.

Abstract: A read protected semi-conductor program memory that can be used for protection of read-only memories built in microhandler of microcomputers comprising a first program memory area intended for storing the program data and a second encryption memory area intended for storing encryption data. A logical operator in intercoupled with the program and encryption memory areas making thus possible, on simultaneous reading of the program and encryption memory areas, to obtain encrypted program data.

Abstract: A TTL-CMOS output stage for an integrated circuit includes a bipolar transistor and a MOS transistor series connected between the power supply and ground, their common point forming the output terminal of the TTL-CMOS output stage. A first switching control input channel includes an inverter whose input forms the input terminal of the stage and whose output is connected to the gate of the MOS transistor via a resistor. A second switching control input channel includes a second inverter controlled by the first inverter and whose output is connected to the base of the bipolar transistor by means of a second resistor. The resistors make it possible to limit the transient current and the mean current supplied by the bipolar transistor.

Abstract: A logic AND circuit comprises, in a cascade arrangement, a threshold oscillator having a power supply input connected to a first circuit input and a clamping amplifier providing an output signal only when simultaneously the voltage on a second circuit input exceeds a threshold and the threshold oscillator delivers an output signal. The oscillator comprises a single transistor whose emitter and collector circuits contain two primary windings of a transformer whose secondary winding constitutes a tuned circuit in association with a four-lead capacitor and whose base is biased from the first input via a filter cell having a parallel-connected four-lead capacitor.

Abstract: A X-MAC encoder enables a plurality of components to be encoded, each having a sequence of packets, with the packets being distributed in successive bursts each occupying a predetermined fraction of a television frame line. It comprises a plurality of blocks each having at least one packet encoder provided with a buffer memory for storing digital data coming from a source, and an encoder for distributing the packets in bursts of adjustable duration not greater than the duration of one television line. A base encoder assembly contains a programmable device for allocating a determined window of the television frame to each block. It calls a burst of length corresponding to the width within the window that is allocated by the programmable device, on the basis of the respective block burst encoder, at the beginning of each window in a line.

Abstract: A spacecraft has, in addition to redundant thrusters T3, T4 prime thrusters T1 or T2 arranged to be operated one at a time which are supplied with propellant 1 via valves V1 and V2. The thrusters are of the kind in which energy is transferred to the propellant by employing electrodes which create a current flow path through the propellant gas. A single power supply PSU1 provides power to several electrically-powered thrusters. It is connected such that when actuated all the thrusters to which it is connected become charged. However, only the thruster which receives propellant is able to carry current as the propellant forms part of the current carrying circuit, and this thruster therefore draws power. This technique allows the use of a single power supply for several thrusters while eliminating or minimizing the necessity to switch power from one thruster to another.

Abstract: The ringer comprises a loudspeaker receiving signals from an amplifier, the amplifier having both a power supply input connected to a ringer line providing a ringer signal via a chopper power supply means, and a melody input which is connected to the ringer line via a regulation unit that provides an image signal representative of the power of the ringer signal, and via a transformation unit that transforms the image signal by means of a melody signal applied to a terminal.

Abstract: The device for determining the relative attitude and range of a chaser vehicle and of a target vehicle comprises, on the chaser, a camera for forming the image of a field of view of determined angular extent and, on the target, a set of several markers. The spacing between the markers is such that they are at least partially outside the angular field of view of the camera carried by the chaser when the range between the chaser and the target is less than a determined value, and the target (11) carries reflector means (16) which remain entirely within the field of view, even at ranges less than said value, and which provide images of the markers (14) in the field of the camera.

Abstract: A multi-port microwave coupler has six input ports In 1, In 2, In 3, In 4, In 5 and In 6 and six output ports Out 1, Out 2, Out 3, Out 4, Out 5 and Out 6 and is synthesized from nine 2.times.2 90.degree. hybrid couplers which are arranged as three sets, that is a first set A, B and C, a second set D, E and F and a third set G, H and I. A first group of transmission lines interconnect the first and second sets of hybrid couplers, and a second group of transmission lines interconnect the second and third sets of hybrid couplers The first and third sets of couplers each give a 3 dB power reduction, but the second set give a 1:2 power split between their outputs. Three 90.degree. phase shift, devices X, Y and Z correct the phase of the signals in three of the transmission lines of the second group. When equal amplitude signals are applied to all of the input ports, the combined signal can be directed to any one of the output ports by appropriately selecting the respective phases of the input signals.

Abstract: The multiplexing device is for insertion of digital packets, supplied by several different sources, in a same transmission channel having an average data rate at least equal to the sum of the average data rates supplied by the sources. It comprising a packet call input unit connected to the transmission channel. The sources are cascaded and the downstream source constitutes an interface towards the input unit. Each source comprises a generator of an insertion priority order for each packet as a function of the type of packet, of the number of stored packets, and of insertion rules associated with the type of packets to be transmitted. Each cascaded source, with the exception of the most upstream source, has a routing circuit supplying at its output the highest priority among the two priorities applied to its input, and of which one corresponds to the source itself and the second to the upstream unit.

Abstract: A locking device for preventing a seat from coming loose when the vehicle is moving includes a plate provided with at least one recess (3) for receiving the leg of a seat, and at least one sliding block (4) having at least one open L-shaped notch (5) and able to move between a position in which the open portion of the notch faces the recess and provides a passage for a transverse pin located on said leg, and a locking position in which the closed portion of the notch (5) faces said recess and prevent said pin from being freed, a device (7) urges the sliding block towards its locking position.