Abstract: A method for transmitting synchronization data in an audio and/or video processing system that supports digital two-channel audio transmission between a control center and at least one remote station is disclosed. The synchronization data include speech information and control information. The speech information is transmitted over a first channel and the control information is transmitted as an analog audio signal over the second channel of the two channel transmission path.

Abstract: A method and circuit arrangement for controlling the position of a rotor of rotary motor or a linear motor, e.g. a stepper motor, synchronous motor or the like, has at least two stator windings and a rotor with salient poles, wherein an actual value of the rotor position, e.g. the angle of rotation or the displacement of the rotor, is determined and compared to a desired value of the rotor position, with the exciting current that flows through the stator windings to move the rotor being modified in dependence on a determination of the inductance of the stator winding. The inductance is determined by superimposing the exciting current with a periodic measuring current that has a higher frequency than the operating frequency of the motor so as to prevent the measuring current from influencing the excitation of the stator winding, and by measuring the reactive voltage drop caused by the measuring current across the stator winding.