A subsea power cable includes a conductor encompassed by a layer of high voltage insulation material including inner and outer semiconducting layers. The signal is susceptible to fluctuation as a result of local air currents acting on the hod or on the articles contained therein. One or more variances in the audio information at the start of the interval and the audio information at the end of the interval then may be used to identify or otherwise characterize the interval as representing an actual chapter break. An audio transducer of the first row and an audio transducer of the second row form a column to produce, in concert, an audible signal. The hopping pattern set by the control unit is made up of two hierarchies. The rectifier elements are, for example, diodes which differ from one another with regard to the following properties: switching time or the reverse recovery switching time andor current density andor chip area andor chip thickness andor the breakdown voltage andor internal resistance andor path resistance andor with regard to another property which is suited for reducing ripple.