Siemens-albis, Ag

Alfred Grau

Hanspeter Kupfer

Max Loder

Werner Bidese

Hans-Rudolf Fritschi

A switching arrangement for activating a plurality of electrical devices connected to a communication line. The switching arrangement monitors the communication line for the reception of activation signals, and also transmits activation signals to the communication line. The switching arrangement activates an electrical device (from the plurality of electrical devices) connected to the communication line, in response to the detection of the an activation signal, to shift the electrical device from a dormant state (in which electrical consumption by the electrical device is minimized) to a normal, functional operational state (in which a maximum electrical consumption of the electrical device occurs) only when the electrical device is actually being operated. By switching the electrical device between a dormant state and an operational state, the amount of electrical power required to operate the plurality of electrical devices is reduced.

Switching arrangement for activating electrical devices

A method and apparatus for conducting a conference call among a plurality of subscriber stations. Each subscriber station contains a transmitter, a receiver, and an auxiliary receiver. An output of the auxiliary receiver can be selectively connected to an adding member that is located between a microphone and an input of the transmitter. The subscriber stations establishing the conference call connection form a transmission chain. Each subscriber station involved in the conference call, with the exception of the first subscriber station on the transmission chain, receive a user signal of a preceding subscriber station. The user signal of the preceding subscriber station is added to its own user signal to produce a compound signal that is transmitted to the next subscriber station on the transmission chain. A compound signal created in the last subscriber station of the transmission chain is supplied to the receiver of all the subscriber stations on the transmission chain. Each subscriber station can also function as a transition station to permit the making of a conference call to subscriber stations located on another transmission network. Various transmission mediums, such as a wireless system or a line-guided system, can be employed. If a line-guided transmission system is used, the transmitters and receivers of the subscriber stations are inductively coupled to the line.

Apparatus and method for transmitting messages between a plurality of

In order to compensate the unwanted echo caused by the movement of a moving radar device, an arrangement is provided between the output of a coherent oscillator and the input of a phase discriminator. This arrangement comprises a signal processing stage containing two series-connected phase regulating circuits, namely phase-locked loops. The output signal of the first phase-locked loop displays a mixed frequency which is formed by the sum of the frequency of the output signal of a signal generator and a displacement frequency modulated by the Doppler frequency of the unwanted echo caused by the movement of the radar device. In the second phase-locked loop the output signal of the first phase-locked loop is mixed with a further signal containing the displacement frequency.

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Zurich, Switzerland

Alfred Grau