Abstract: A partitioning circuit will partition into subintervals the time interval between two signals delivered by a recognition circuit, and will activate a gate circuit during one of these intervals which has been predetermined. In addition to the recognition circuit, the sequence of signals from a sensor responding to the occurrence of an at least approximately periodic event, is fed to a comparator circuit which will transmit a pulse to the gate circuit each time a certain signal level has been exceeded. If the gate is active, this pulse will be available for further processing.

Abstract: An apparatus is disclosed, for measuring the angular position of a shaft of a machine at the occurrence of an event originating from the operation of the machine, relative to a reference position of the shaft. The apparatus comprises a first sensor responsive to the reference position of the shaft (signal II) and a second sensor which, on the occurrence of the event, produces an output pulse and which produces a number of interference pulses in the periods between production of the output pulses (signal I). A comparator (4) having a threshold value which is capable of being exceeded both by the required pulses and the interference pulses, and a recognition circuit (3,6) which is adapted to recognize output pulses produced on the occurrence of the event, are arranged to control an evaluation circuit such as a counter (10). The evaluation circuit ascertains, e.g.

Abstract: A device for measuring rotational angles of a rotating shaft of a machine, and comprising transducers signals of which being released by one or several reference angle signs or a machine characteristic phenomenon respectively, and being input to a processing unit. The processing unit comprises a frequency multiplier circuit and a counter the frequency multiplier circuit multiplying the signal of one or several reference angle signs, with the counter counting the multiplied signals and being resettable and startable by either a reference angle signal or the signal released by the machine characteristic phenomenon and being blockable by the respective other signal.