In a CIRC encoder for carrying out error correction coding processing with a CIRC, a first interleaver and a second interleaver are provided which have different delay parameters, and these interleavers are switched in accordance with the recording density of an optical disc for recording data. The mechanical system is characterized in that the rolling bearing is an angular-contact bearing and comprises at least one pressed ring comprising means of attachment of the rolling bearing to the first element or the second element. The capacitor’s first terminal is connected to a first input terminal of a comparator. The stent alternatively can include sections adjacent the end of the stent with greater bending flexibility than the remaining axial length of the stent.