Abstract: A method of transmitting signals of different information rates between a subscriber and a central exchange of a service integrated system operating in time multiplex wherein the signals to be transmitted are combined at the transmitting end by means of multiplexers and the transmitted signals are recovered at the receiving end by means of demultiplexers. The frequency of the time multiplex frame, i.e. the frame frequency, is selected to be equal to the smallest information rate of the signals to be transmitted and one information unit of the signal having the smallest information rate is transmitted per frame.

Abstract: A gate turn-off thyristor comprising, a first emitter layer of one conductivity type, a main base layer of another conductivity type connected to said first emitter layer and a control base layer of the first conductivity type connected to the main base layer. A second emitter of the other conductivity type is connected to the control base layer at a junction which surrounds a portion of the second emitter layer. An emitter contact is connected to the second emitter layer and a control base contact is connected to the control base layer. The gate turn-off thyristor is turned off by a short circuiting of the control base contact with the emitter contact. The surface resistance of the control base layer between the second emitter layer and the control base contact is selected so that, with a control base turn-off current applied which is sufficient for turning off the thyristor, a potential appears on a lateral resistance in the control base layer which is less than a potential appearing at the junction.

Abstract: An apparatus and method for transferring a fluid, such as oil, between a fluid conveying line and a ship. The apparatus includes a transfer unit anchored at the bottom of the sea and attached to the fluid conveying line, and a coupling device which is brought into the ship together with the transfer unit so that connections can be made to the coupling device at a weather resistant location within the ship. Fluid is transferred between the fluid conveying line and the ship via the transfer unit and coupling device.

Abstract: A stripline filter having at least two tuned striplines and a directional stripline coupler wherein the coupling path of the directional stripline coupler is located in the signal path between the input and output terminals of the filter. The stripline filter comprises an insulating substrate having a ground conductor affixed thereto and at least two tuned stripline resonators secured to the substrate, the resonators being electrically connected to the ground conductor. The tuned striplines resonate at one-quarter of the wavelength corresponding to the operating frequency of the filter. The directional stripline coupler consists of a pair of spaced conductors, at least one of which forms a part of one of the tuned striplines. The electrical length of the directional stripline coupler is substantially less than the total length of a tuned stripline conductor.

Abstract: A high voltage disconnect switch, including a countercontact piece having switch countercontacts and being arranged for connection to a source of high voltage. Resilient pre-contact pieces are insulatingly connected to the countercontact piece and include switch contacts disposed for contacting the switch countercontacts. Movable primary contact pieces are arranged to be movable from a first position of separation from the pre-contact pieces and the countercontact piece to a second position in which the primary contact pieces are in contact with the pre-contact pieces but not with the countercontact piece and to a third position in which the primary contact pieces are in contact with both the pre-contact pieces and the countercontact piece.

Abstract: A switched mode power supply transformer, particularly for a television receiver, including a primary winding and a secondary winding with the primary winding and the secondary winding each being subdivided into a plurality of respective partial windings. The partial windings of the primary lie in a first group of chambers and the partial windings of the secondary lie in a second group of chambers of a chamber coil body, and the chambers of both groups are nested or interleaved with one another.

Abstract: A thyristor with an amplifying gate including a silicon semiconductor body having n.sup.+ conductive main and auxiliary emitters at the cathode side, wherein a p.sup.+ zone is formed in a region of the p control base zone adjacent the surface of the semiconductor body between the auxiliary emitter zone and the main emitter zone. The p.sup.+ zone contacts the edge region of the main emitter zone which faces the auxiliary emitter zone, and preferably projects into the edge region, and forms a p.sup.+ n.sup.+ junction with the main emitter zone. Also, the p.sup.+ zone is laterally spaced from and does not contact the n.sup.+ auxiliary emitter zone.

Abstract: The present invention relates to a monolithically designed input stage for an optical receiver, the input stage comprising a PIN (more specifically a PNIN) photodiode and a connected field effect transistor. The photodiode, which includes an absorption zone of GaInAsP for the optical radiation and a pn-junction formed by InP layers, is disposed together with the field effect transistor on a common semi-insulating InP substrate.

Abstract: A system for recording or playing back a television signal which includes an audio carrier which is frequency modulated with an audio signal, the television signal being recorded along oblique tracks on a magnetic tape and including two playback or recording heads which alternately scan successive tracks. The system includes a controllable amplifier connected to conduct the modulated audio carrier signal, and circuitry connected to control the amplifier for causing it to produce an audio carrier signal during switching between heads in order to reduce interference in the audio signal during such switching.

Abstract: A method of measuring ion concentrations in solutions comprises using at least two ion sensitive test electrodes in the solution to be measured, the test electrodes having different sensitivities only in respect of the ion or ion mixture to be measured, setting the operating point of the test electrodes by means of at least one common reference electrode, and evaluating the signals of the test electrodes to produce a measurement result essentially independent of the properties of the reference and test electrodes which would interfere with accurate measurement.The invention also includes apparatus suitable for carrying out the method.

Abstract: An electronic amplifier composed of an electronically controllable amplifier element having a control input for receiving a voltage the value of which determines the gain of the element, with one such value being a predetermined basic gain value of the amplifier element, a control voltage generating circuit for generating a control voltage whose value determines the voltage at the control input of the amplifier element, the element and circuit being constructed for causing the gain of the amplifier element to be unity for one voltage value at its control input and to be different than unity for other voltage values, a nonlinear filter unit connected between the control voltage generating circuit and the amplifier element control input for supplying to the control input a voltage determined by the control voltage, the filter unit including an integrating branch and a differentiating branch having a rectifier device for causing the differentiating branch to be effective only during periods when the control volt

Abstract: A broadband corrugated horn radiator including a hybrid mode exciting member whose inner cross section is constant over its entrie length and a transition member from the cross section of the hybrid mode exciting member to the cross section of the horn aperture. The length and the inner cross section of the hybrid mode exciting member are dimensioned such that the waveguide mode entering this excitation member is converted completely only to the desired hybrid mode type, the pitch of the wall of the transition member is such that no interference waves are able to exist therein, and the corrugation grooves in all members of the horn radiator are matched, by appropriate dimensioning, to the same transmission bandwith.

Abstract: A conveying device for rectangular substantially flat objects, for example, letters, including first and second conveyor sections each including a guide trough which defines a conveying path for the objects and supports a longitudinal edge of same, a direction changing conveyor section connecting the first and second sections together so that objects can be conveyed from the first to the second section, and a rotating pulling device having a plurality of pusher fingers mounted thereon for moving the fingers along the guide troughs of the first and second conveyor sections so as to move objects along the conveying path. The pulling device is mounted on a plurality of drums with one of these drums being disposed in the direction changing conveyor section and having a first contact surface for the pulling device.

Abstract: An epitaxial reactor comprises an enclosed evacuable container, a heating tube in the container in the wall of which there is a heat source and a temperature control system which is sealed at one end, a feed line for reaction gas, which line passes along the heating tube so as to provide an outlet for reaction gas adjacent the seal, and means for accommodating the elements to be treated on the inside of the heating tube.

Abstract: In a method and apparatus for transmitting digital signals by means of signal generators by initially converting a double current pulse train, under control of bit clock pulses and before transmission, into a first unipolar pulse train composed of pulses corresponding to all positive transmission pulses and into a second unipolar pulse train composed of pulses corresponding to all negative transmission pulses, the pulse trains are code converted independently of the duration of the bit clock pulses for producing a converted signal having a first transmitting amplitude in correspondence with each pulse of the first pulse train and a second transmitting amplitude in correspondence with each pulse of the second pulse train, the second amplitude differing from the first, and the converted signal is applied to a signal generator for producing an output signal corresponding to the converted signal and in which the transmitting amplitudes corresponding to both unipolar pulse trains vary the output signal in the same

Abstract: In a puffer-type gas blast switch including a gas compression device composed of two components defining, respectively, a piston and a cylinder, one of the components being stationary and the other one of the components being movable for compressing a quenching gas in the chamber during switch opening, a nozzle mounted for directing the compressed quenching gas from the chamber against a switching arc, a first power contact fixed to the movable component of the gas compression device and movable between a switch closing position and a switch opening position, a second power contact arranged to be conductively connected to the first power contact when the latter is in its switch closing position and movable with the latter during at least the initial portion of its movement from the switch closing position, and spring means urging the second contact in a direction to break its connection with the first contact, the second contact is directly and releasably connected to the first contact when the first contact

Abstract: In a circuit for supplying power to a subscriber telephone device connected to a central office via a two-wire line, which circuit includes a main power supply at the central office and a switching unit at the telephone device actuatable to place the device in operation and to connect an electrical load in circuit across the line, there are additionally provided an auxiliary power supply disposed at the central office and connected across the line when the telephone device is not in operation, and a circuit connected for selectively connecting the main power supply to the line when the telephone device is in operation.

Abstract: An electrophotographic image carrier structure comprises an electrically conductive substrate, a selenium-containing photoconductive layer including more than 35% by weight arsenic, a polyvinyl carbazole covering layer and an intermediate amorphous selenium layer which is situated between the covering layer and the photoconductive layer and which has an arsenic content of zero to less than 0.5% by weight.

Abstract: In a superheterodyne signal receiver including an input circuit arranged to be tuned to a frequency to be received and including a signal controllable variable reactance element presenting a reactance whose value is adjusted by a tuning signal and determines the frequency to which the input circuit is tuned, and a controllable local oscillator producing an alternating signal to be mixed with a received signal to produce an intermediate frequency received signal, a tracking circuit composed of: a first frequency control circuit including the local oscillator; a second frequency control circuit including a controllable sampling oscillator and a member connected to respond to the frequency of the output from the sampling oscillator to derive a signal related thereto and supplying that signal, as the tuning signal, to the controllable element; and a control signal generating unit generating first and second control signals and connected for supplying the first control signal to the first frequency control circuit

Abstract: The present invention comprises a method of transmitting information from a central ground station to at least one mobile auxiliary ground station via at least one base station. The auxiliary ground stations are located within the transmitting range of at least one base station, and are provided with a receiving device having a control unit and a memory. In accordance with this method, a block of messages cyclically repeated within a time frame is transmitted over a single frequency from the central ground station to the base stations. Each of the messages within the block includes an address code which corresponds to the area code of the region adjacent a corresponding base station.The base stations transmit the block of messages over a single frequency to receiving devices located in the mobile auxiliary ground stations where those messages corresponding to a selected area code are recorded and then played back.