Abstract: Method of compatibly increasing the resolution in a color television system employing offset modulation at the transmitter and offset demodulation at the receiver and transmitting a reference signal during the vertical blanking interval. The reference signal includes two components of which the first component contains phase information regarding the spectral addition at the receiver and the second component contains information regarding the offset modulation phase. Thus offset demodulation is realized at the receiver while retaining compatibility with existing television standards.

Abstract: The present invention relates to an E-plane type wideband composite filter comprising a conductive screening body (11, 12) having an elongate cavity (14) therein with a blade cut into a ladder shape disposed longitudinally therein. Said body comprises two portions held against each other on either side of a separation plane along which said ladder (15) is disposed, with two irises (16, 17) being disposed transversely at the inlet and at the outlet of said cavity (14), each closing off a portion thereof.

Abstract: A Subscriber Line Interface Circuit (SLIC) having a voltage regulator for application thereto of a DC supply voltage V.sub.B and connected at the output terminals to an audio transmission line to provide a line current I.sub.L and voltage V.sub.L for a given resistance load R.sub.L on the line, is provided with a control circuit which, by picking up appropriate current and voltage values from the interface circuit, outputs a voltage value which is the equal of the difference between an optimum supply voltage V.sub.BF and the supply voltage V.sub.B. The control circuit output is connected to the voltage regulator to minimize the voltage V.sub.BFK applied to the interface circuit as the transmission line resistance load R.sub.L varies, thus minimizing the power dissipated through the interface circuit.

Abstract: The invention pertains to a rotating anode with graphite for an X-ray tube in which the quality of the bond with the graphite is considerably improved in comparison with the prior art, through the use of a bonder element comprising beryllium.

Abstract: The symbol synchronization method for the symbol demodulation of a digital signal uses E sequences of samples taken from the demodulated signal, each sequence being offset with respect to the following one by a fraction of the symbol period Ts/E. On the basis of each one of E sequences of samples (Si1,Si2, . . . SiN) ranging from from i=0 to E-1, a value F(i) of a pre-defined function F, optimized according to the type of modulation made at emission, is calculated. This function, which can be identified with a sine model, A+B COS(i-io)2.pi./E, can be used to determine io characteristic of the synchronization time-shift and, if necessary, A, characteristic of the d.c. offset, and B, characteristic of the variation in levels due to reception conditions. These values are used to correct the synchronization signal and, if necessary, the d.c. and the decision thresholds of the decision circuit during the symbol demodulation.

Abstract: A large-format photosensitive device for detection of radiographic images comprises a semiconductor substrate of lightly n-doped hydrogenated amorphous silicon. On one face of the substrate are supported rectangular picture frame-like pads disposed in a matrix array, each having a central opening and formed of material which provides a rectifying junction with the semiconductor substrate, a layer of insulating material, and a control grid capacitively coupled to the pads. On the other face of the substrate are supported an array of drain electrodes located opposite the central openings of the pads, ladder-type source electrodes which circumscribe the drains, a layer of insulating material, and a conductive pattern for interconnecting all of the drains in a common row of all the columns in the array.

Abstract: An electronic beam device is provided for projecting the image of an object on a sample, including two electromagnetic lens reduction stages. A single insulating tube is disposed between an object and the same plane, this tube having an inner metallized face.

Abstract: In electron guns for electronic tubes, such as travelling wave tubes, for power modulating the electron beam, the distance between the cathode and the modulation grid increases the closer to the axis of the tube. Such a gun can be applied to travelling wave tubes operating with a zero enabling voltage and whose modulating frequency covers a very wide band.

Abstract: A method for reading a photosensitive element having a photodiode and a capacitor as applicable in particular to reading a low-level analog signals consists in introducing a biasing charge background, for example by means of calibrated uniform illumination prior to each read operation in order to cause forward biasing of the photodiode substantially beyond its knee voltage at the time of application of a control read pulse which reliably restores the voltage at the photodiode terminals to the knee voltage value, the current during the read operation being such that all the charges are then reliably transmitted via the capacitor to the integrating read amplifier.

Abstract: A device for measuring the ratio between a first capacitor and a second capacitor in which first and second switches are provided for selectively conducting a signal, therethrough based on a control signal. A capacity switching device receives the two capacitors, and includes a third switch for switching between these two capacitors. A control device controls the first and second switches to conduct in phase opposition to one another, and the third switch to connect the first and second capacitors separately and successively between the first and second switches. An integrator is connected to the output of the capacity switching device to integrate the output signal, and a capacity ratio measuring circuit is provided to detect the capacity ratio. In this way, detection of capacity ratio can be performed independent of the switching currents for the switches, the biasing current for the integrating amplifier, and any other biasing currents.

Abstract: The invention provides a matrix of photosensitive elements in which each photosensitive element is reduced to the association of a diode and a capacity. The method for manufacture thereof is therefore easy particularly from amorphous silicon. The method for reading same uses multiplexed reading of the columns: the n columns are distributed in groups of n/M successive columns controlled simultaneously by M horizontal shift registers, each associated with a reading integrator. To ensure correct reading of the useful signal, whatever their level, the level of the voltages at the terminals of the diodes of the photosensitive elements is reset so that the starting voltage at the beginning of each reading pulse applied to a line is such that only this pulse, and even with a maximum useful illumination signal, can bias the diode forwardly, and so that with a column addressing pulse, the diode is biased forwardly even in the absence of the useful signal.

Abstract: A roller-cage assembly for use in a bearing includes a cylindrical cage provided with a plurality of openings extending axially and spaced apart from one another circumferentially and a plurality of rollers, each of which is received in a corresponding one of the openings. Each opening is defined by a pair of oppositely disposed side guide surfaces and a pair of oppositely disposed end guide surfaces, whereby the distance between the pair of oppositely disposed side guide surfaces is larger than the diameter of the roller and the distance between the pair of opposite end guide surfaces is larger than the length of the roller, so that the roller may rotate freely within the opening.

Abstract: A device enables to reproduce without flicker mixed signals from VT and/or BTX decoders during the reproduction of television signals (mixed operation). This is obtained by a video frequency scanning field compensation in the vertical direction effected by a video frequency additional connectable scanning amplifier which supplies a reduced inductivity additional scanning winding.

Abstract: In order to reach precisely a predetermined place on an audio disk during a search run with contactless scanning, the scanning speed is determined from the speed of rotation of the disk. This occurs preferably at the beginning of the first recorded piece. The information concerning the speed of rotation of the disk is determined from the radial error signal. The arrangement is adapted for determining scanning speeds that vary among disks, and where each disk has a scanning speed that is unique to the disk and differs from the scanning speed of another disk.

Abstract: A direct voltage multiplier which can be integrated into a semiconducting structure. The multiplier comprises a capacitor which is charged and discharged at the pace of a clock signal, with a depletion-mode MOS transistor mounted as a resistor and enabling the capacitor to be discharged. The invention makes it possible to integrate the multiplier into a semiconducting substrate and can be used, in particular, to control a VD MOS.

Abstract: A Langmuir-Blodgett film comprises at least one layer of amphiphilic molecules which are of two different types. The first type comprises molecules that are active in nonlinear optics. The second type consists of molecules that are inert or active in nonlinear optics. The mixture of these two types of molecules, in specified proportions, gives a film capable of radiating, perpendicular to the substrate, an optic wave which is a second harmonic with reference to an exciting wave.

Abstract: A component of semiconductor material deposited by epitaxial growth on a substrate having a predetermined and different lattice parameter consists of an alternate succession of layers of a first type and layers of a second type deposited on the substrate. The lattice parameter of the first type of layers is substantially matched with the lattice parameter of the substrate. In the case of the second type of layers, the lattice parameter is matched and even equal to that of the first type of layers. A component having a lattice parameter equal to that of the second type of layers is formed on the last layer of the second type. Moreover, the energy gaps of the two types of layers are different.

Abstract: In order to obtain perfect scanning of audio and/or video disks through application of contactless scanning with a coarse and fine drive system for radial servo readjustment, the fine drive optimum working point is reached through a correct interaction of coarse and fine drive, even in the case of different large radial eccentricity amplitudes. This is achieved through adjustment of the coarse drive, using a comparator, as a threshold value detector, and through an evaluation of the pulse sequences occurring at the comparator output. A radial-error signal for the coarse drive is obtained from a control parameter for the fine drive. The coarse drive is started by pulses when the pulses obtained from a radial-error signal exceed a predetermined pulse-to-interval ratio.

Abstract: The circuit disclosed can be used to process synchronous video signals, especially those coming from two standard CCD sensors. It comprises two channels connected at the output to the two inputs, respectively, of an adder circuit which gives the mixed video signal. The first channel comprises a subtractor circuit which receives the two video signals, a high-frequency filter circuit to eliminate the low-frequency spectrum ranging between 0 and a determined limit frequency, an amplifier circuit to balance the gain of the two channels and a fast change-over/sampler circuit connected to the first input of the adder during half of each dot cycle, while the second input of the adder continually receives one of the video signals. The mixed signal thus comprises an unchanged low-frequency component which eliminates faults in the sensors related to non-homogeneity.

Abstract: The process for the code conversion of eight parallel bits into words with nine series bits uses among the nine-bit words on the one hand those having five "1" and four "0" and which do not have five consecutive bits and whereof none starts or finishes with four identical bits, as well as their complements to 1, and on the other words having six "1" and three "0" with a maximum of transitions, as well as their complements to 1. Two complementary digital frame synchronization words are chosen from among the nine-bit words not retained for coding and which are not found in a random series of coded words.