A memory control part 12 cyclically assigns time slots to buffer memory parts 21 to 25 respectively and in each time slot, controls access between the corresponding buffer memory part and a synchronous RAM 11. If the high rate is selected for noise reduction by non-coherent averaging, the samples are averaged over time and transformed to the low rate. The device and a method for moving tubular material inside an furnace allows a greater rotation of the tubes over short cycle times, solves the problems of twisting of smaller-diameter tubes in quench furnaces and meets the need to rotate the tubes when there is no forward movement, which may be necessary when cycle times are long or when unloading from the furnace is interrupted. The coupled high-frequency signal is rectified by an equivalent diode between the gate and drain of the junction-type FET, and is superposed onto a DC voltage applied to the gate of the switch FET.