Abstract: In order to be able to use the combination of a commercially available type of television receiver (1) with a commercially available type of video tape recorder (3) or video disk recorder, additionally also as a home computer, a data and address bus (32) is provided for additionally in the television receiver, to which there are connected a processor module 30, a computer module (33), a data storage (34), and a character generator (35). A computer control circuit (41) switches the equipment combination into a computer operational state in which the deflection circuit (40) and the video signal amplifier circuit (6) for the picture tube (7), are connected to the output of the character generator, and the recording and reproducing lines (21) of the video tape or video disk recorder are connected via a code converter (42) to the data and address bus (32).

Abstract: In order to facilitate a shape-keeping compression in a process of fabricating an elongated glass-body, particularly a preform for optical waveguides on the basis of SiO.sub.2 in which, from a powdery glass starting material a porous body is formed and sintered into a glass body, there is provided a process in which the filling of the powdery glass starting material into the compression mold is carried out by simultaneously effecting a precompaction and in which, following the fill-in operation, the pre-compacted powdery material is compressed to obtain the porous body. Steps and measures are proposed for stabilizing the flexible hose which is preferably used as a compression mold, in its shape during the fill-in process. For the filling-in of the material there is used a screw conveyor or an arrangement of several screw conveyors arranged coaxially or next to each other, in order to form a porous body having the desired radial material composition.

Abstract: The invention relates to a mounting support (1) for phototransmitters (10) and photoreceivers (11) to be arranged in the way of forked light barriers, between which the rim portion of a signal disk (28) is capable of being moved. On the mounting support (1) there are provided insertion openings (8, 9) for inserting the phototransmitters (10) and the photoreceivers (11). These are provided with a locking element with which the inserted phototransmitter (10) or the inserted photoreceiver (11) can be locked and thus definitely fixed in their positions. No other adjustments are required.

Abstract: In an optically controlled phased array radar control information in the form of microwave frequency modulation of an optical carrier is transmitted by optical waveguide from a central processor to each of the antenna elements. Phase shifts introduced by each of the individual waveguides are then monitored to provide a compensation signal used either to regulate the phase shift or to offset the phase of the modulation applied to the waveguide at the central processor end.

Abstract: A fail-safe 2-out-of-3 selecting facility for a 3-computer system is disclosed which is especially suitable for use together with microprocessors having a large number of outputs. The computers (R1 . . . R3) of the 3-computer system handle the same information in parallel but asynchronously, exchange their results, and compare them. The output buses (A1, A3) of two computers (R1, R3) transfer the results in nonequivalent form, and are connected to two data output channels (AK1, AK2) via separate transfer switches (U1, U2). Depending on the result of the comparisons performed in the computers, the output ports of faulty computers are disconnected and the transfer switches are controlled in such a way that the output port of a faulty computer is disconnected from the associated data output channel, and that the output port (A2) of the third computer (R2) is connected to this channel instead.

Abstract: A connecting element for chip carriers comprises a unitary pin frame of insulating material and a set of contact elements which are secured within the frame by injection molding. Each contact element comprises a wire segment having a terminal end projecting from the bottom of the frame to connect with a printed circuit board, the wire segment including a portion extending upward from the frame to serve as a spring leg for connection with a contact surface of a chip carrier. Connection may be made by soldering. The chip may be supported either on top of or hanging below the carrier. The spring legs press laterally into semicircular cutouts on the sides of the frame. Posts are provided on the frame for restricting the insertion depth of the contact elements. The posts may be formed by injection molding and may be located at miter-joint areas of pieces of the pin frame.

Abstract: A hermetically sealed injection laser package is made by first forming a sub-assembly of a monitoring photodiode (50) on a metal support member (53) and welding it to a heat sink (30) on which the laser (31) is mounted. The heat sink is secured inside the package housing (10) and then a further sub-assembly, comprising a plastics packaged optical fiber (60) hermetically sealed in a fiber support tube (61), is introduced through an aperture in one wall of the housing. Anchorage means (70) is laser beam welded to this tube and to the heat sink to secure the inner end in position for optimum optical coupling between the laser and the fiber.

Abstract: The present invention relates to a telecommunication line circuit including at least one line amplifier whose output is coupled to a telecommunication line conductor, and DC biasing means associated with said amplifier to apply thereto a DC bias signal of such a value that said amplifier cannot saturate when an AC metering signal is applied to it.

Abstract: Several satellites serving as reference stations (S.sub.j) for a user revolve about the earth in different orbits. At least four reference stations must be within sight of a user station (N) at the same time. The user station measures the ranges to at least four reference stations by one-way ranging. From these ranges and the positions of the reference stations, which are transmitted as data words, the user station determines its position.To determine the positions of the reference stations, the ranges from the respective reference station to at least three ground stations (B.sub.i) are measured by two-way ranging. From these ranges and the known positions of the ground stations, the position of the reference station is obtained. The interrogation signals of all reference stations contain the same basic signal (K.sub.s), which represents a pseudorandom code. The reply signals of the ground stations contain differently coded signals (K.sub.

Abstract: Pulse Code Modulation (PCM) translator for translating a PCM input word into a PCM output word, one of said words being in accordance with a compressed code and the other with a linear code, characterized in that it is adapted to convert the binary bits of the input word into those of the output word in accordance with either the A-law or the mu-law. The circuit forms part of a telephone line circuit (LC) connected between a telephone line (LI) and a digital switching network (SNW) and comprising the cascade connection of a subscriber line interface (SLIC) able to perform line control and supervision, a digital signal processor (DSP) mainly adapted to execute analog-to-digital and digital-to-analog conversion operations, the above transcoder circuit and a dual processor terminal controller (DPTC) which deals with the general control of the line circuit. The DSP only processes linear PCM signals, whereas the DPTC solely operates on companded PCM signals.

Abstract: An integrated circuit for a telephone instrument provides the basic (POT) service requirement. The transmit and receive channels of the circuit may be fed via controlled attenuators incorporated in a first ancillary circuit to provide hands-free operation. The circuit also includes a current-limited power supply whereby connection to a second ancillary circuit, including an audio amplifier, may be effected to provide loudspeaker operation.

Abstract: An electro-acoustic transducer of the moving coil type, which includes a driven unit including a drive coil, and a magnet unit including a magnet and two pole-piece so located as to define an annular air gap in which the coil is located. The driven unit further includes a substantially circular central portion whose outer periphery is secured to the coil, and an outer portion whose inner periphery is secured to the coil and whose outer periphery is secured to a member of said transducer, which contains said magnet unit at a flat face of the member. The transducer member is substantially cylindrical. A flat cup-like member of larger diameter than the member is secured to the flat face. The driven unit also includes a cone whose inner periphery is secured to the coil and whose outer periphery is secured to the outer rim of the cup-like member.

Abstract: The disclosed invention relates to an electro-optical device for use with a facsimile printer, telecopier, etc., designed to accommodate line-at-a-time output of picture information with the aid of an electrically controllable electro-optical substrate made from a transparent electro-optical material, with the optical effect being controlled by applying a voltage between two control electrodes arranged next to each other on the substrate. According to a preferred embodiment of the invention, within the area (4) of the substrate (1) to be controlled, and in addition to the control electrodes (2,3), there is provided at least one additional electrode (7) which may be common to several such areas (4), with each area (4) to be controlled having a corresponding opening (8) in the additional electrode (7) and the two control electrodes (2, 3) being spaced apart from each other on one side of the substrate (1) and the one or more additional electrodes (7) being arranged on the opposite side of the substrate.

Abstract: A complex capacitive impedance (Z) whose capacitance value is considerably larger than the total capacitance of the components used in it is implemented by connecting a capacitive impedance (Z3) in series with a first resistor (R1) to form a voltage divider, and bypassing the first resistor (R1) with a voltage follower circuit (SFS).

Abstract: An acousto-optic isolator for a semiconductor laser diode comprises a Fabry-Perot resonator tuned to the laser optical frequency f.sub.o followed by an acousto-optic Bragg diffraction device utilizing surface acoustic waves of frequency f.sub.a launched from a transducer. Light focussed by a lens to the load has a resultant frequency f.sub.o +f.sub.a. Any light reflected from the load suffers a further change in frequency to f.sub.o +2f.sub.a in the diffraction device and hence is blocked by the resonator. Undiffracted light can be detected at a photo-detector and used in a feedback control loop to stabilize the light source to the resonator.

Abstract: This invention relates to a page printer having an electro-thermal dot-matrix printing mechanism. The latter comprises at least one print plate which is disposed parallel in relation to the print line and radially in relation to the platen, which is hooked at both ends into a tensioning device. The print plate consists of a carrier plate made of material having relatively good electrical and heat-conducting properties. It is applied with its front surface to the thermo-sensitive recording medium on which recordings are made via a plurality of closely adjacent heating elements. These heating elements are deposited onto at least one of the lateral faces of the carrier plate, made flush with the front surface, and are conductively connected to the carrier plate. The remaining part of each of the lateral faces is covered, throughout the widths of the heating elements, with a layer of insulating material on which the conducting paths extending to the heating elements are disposed.

Abstract: A facility is provided for recovering the clock and data from a data stream transmitted in the bi-phase code even if the data stream contains no sync bits and if the transmission speed varies.For clock recovery, a nonretriggerable monostable multivibrator is triggered at each phase change, so that the inserted phase changes are rendered ineffective. The clock is used to control a memory which receives the valid data of the transmitted data stream at the correct instant and keeps this data constant during one clock period.

Abstract: An instrument for measuring the distance of a body in relative motion away from a datum point measures the optical attenuation of an optical fibre that has an end secured to that datum and extends to the body where the remainder of the fibre is coiled. As the body moves away, so progressively more fibre is uncoiled, and the contribution of bending losses to the total loss is reduced and hence the resulting reduction in attenuation provides a measure of distance travelled.

Abstract: An acousto-optic deflector system including first and second transducers for producing acoustic waves for interaction with an optic beam in an acousto-optic device. The transducers are driven by signals of differing frequencies (f.sub.1 +.DELTA.f, f.sub.1) in order to produce two deflected optical beams from an incident optical beam launched from a laser. The two deflected beams are detected by a common photodetector whose output is filtered whereby to separate a component which is dependent on the frequency difference. The phase of this component is the relative optical phase of the two deflected optical beams. By determining the phase of the component for different frequencies (f.sub.1, F.sub.1 =f.sub.T etc.), the optical angle of incidence (.theta..sub.i) may be obtained. Alternatively, by frequency modulating both transducer drive signals and appropriately electronically processing the detector output, a signal whose amplitude varies with the optical angle of incidence can be obtained.