Abstract: An electronic voice circuit configuration can be connected through a first and a second line terminal to a telephone line. The electronic voice circuit configuration has a calling part, a transmitting device, a receiver device, a symmetrical modulator circuit with voltage stabilization, a symmetrical equipment impedance device with a device for symmetry control and direct-current limiting, and a symmetrical control device.

Abstract: A ringer circuit includes a rectifier unit receiving a calling alternating voltage and having first and second output terminals. An acoustic transducer has first and second terminals. A controllable first switch is connected between the first output terminal of the rectifier unit and the first terminal of the acoustic transducer. A controllable second switch is connected between the first and second terminals of the acoustic transducer. A capacitor is connected between the second terminal of the acoustic transducer and the second terminal of the rectifier unit. A switch control is supplied from the capacitor for opening and closing the first and second switches in alternation and in phase opposition to one another as a function of the calling alternating voltage.

Abstract: A circuit configuration includes a final control element being adjustable as a function of a control current, wherein the function is subject to certain fluctuations and variations. A constant current source supplies an output current being equally subject to the certain fluctuations and variations. A multiplier is connected between the constant current source and the final control element, for varying the current output by the constant current source by a factor being dependent on a control signal, and for delivering the current output by the constant current source to the final control element as the control current.

Abstract: A method for transmitting two independent types of information over a transmission path having a transmitter side and a receiver side, a storage unit and a multiplexer device including sampling and time-compressing a first information type on the transmitter side by means of a fast clock for generating time gaps, and transmitting the first information type on the transmitting path, transmitting a second information type within the time gaps over the transmission path, the first and second information type is read on the receiver side and recovered by time expansion using a slow clock. The first signal is interim-stored on the receiver side under the control of the slow clock and by generation of the time gap, under control of the fast clock frequency.

Abstract: An appartus for generating a multi-frequency signal includes a D/A converter, two converter circuits connected to the D/A converter for determining a respective connecting instant, two controlled waveform counters each being connected to a respective one of the converter circuits, a D/A cycle control connected to the converter circuits for monitoring the converter circuits, a sample-and-hold circuit having divider capacitors and being connected to the D/A converter, and holding capacitors connected to the sample-and-hold circuit.

Abstract: Semiconductor circuit including at least two clock-controlled charge-displacement devices respectively having a multiplicity of storage cells with respective information content, each of the storage cells of a first one of the charge-displacement devices being operatively associated with a respective storage cell of a second one of the charge-displacement devices, means for transferring information content of the storage cells of one of the first and second charge-displacement device to the respective storage cells of the other of the first and second charge-displacement device operatively associated therewith, and means operatively associated with one of the at least two clock-controlled charge-displacement devices for serially reading-out therethrough new information obtainable as a result of the information transfer.

Abstract: Monolithically integrated semiconductor circuit with a signal input addressable by a first signal type, constituting analog signals, and with a signal output delivering a second signal type, constituting digital signals, including a circuit section for converting the analog signals of the first signal type into the digital signals of the second signal type, the circuit section being a charge transport circuit forming an analog adder.