A robot, such as a bipedal robot, that includes three or more rigid links such as two legs and a pelvis. The processing continues by determining whether the object-element is to be clipped when it is within the clipped volume. The automatic setting unit sets the first gain for correcting an echo signal in accordance with the adjusted transmissionreception conditions. The criterion memory entry contains one or more values to be used as comparands on one side of the comparison, where corresponding values from a received packet appear on the other side of the comparison. The electronic control module accesses the memory device and reads the calibration data and the unique identification number in order to control the shock absorber.