Abstract: The device 1 for the management of a plurality electric battery elements 2 connected in series, comprises a plurality of battery management modules 4, each management module being connected in parallel to the terminals of a respective battery element 2 and supplied by its output voltage, the management modules 4 including a digital circuit 11 and being connected in series by at least a digital liaison 9, 9' so as to exchange binary information between said digital circuit 11 and a control unit 5 of the battery, and is characterized in that at least a capacitor 8, 8' is connected in series on said digital liaison 9, 9' so that the binary information may be exchanged between each management module 4 and the unit control 5, independently of the electric potentials at the terminals of the battery elements 2.

Abstract: A spectrum analyzer comprises a plurality of filters each provided with a low-pass output and a high-pass output both having the same cutoff frequency which is different in the case of the different filters. Switching means are provided for periodically connecting pairs of filters in cascade during a first time interval between one input for signals to be analyzed and a filtered-signal transmission channel assigned to each pair of filters. One of the filters of each pair has a high-pass (or respectively low-pass) output connected to the input of the other filter whose utilization output is the low-pass (or respectively high-pass) output. The switching means also have the function of periodically establishing a cascade connection during a second time interval between pairs of filters which are different from the first pairs. In the case of one filter, the output utilized during the second time interval is different from the output utilized during the first time interval.