System and method for processing signals are disclosed. The outer wall of each of the beads is flexibly deformable by pressure applied to the outer wall, and is ruptureable by pressure applied to the outer wall to create an opening in the outer wall into the interior space of the bead. Moreover, a first switch for enabling an output node of the second voltage to become conductive to the predetermined potential and a control circuit for turning ON the first switch for the predetermined period in response to input of the first voltage are also provided.