There is provided a display system for an elevator which can display an operating state of an elevator car without a sense of discomfort even though data transmission performance is not improved. The dielectric material has an upper surface with a first degree of planarity. A response associated with the computed S_hat filter is compared to a predetermined response that is stored in the device. Also, a simplified axial load adjustment is achieved by determining an appropriate size of the pressure attenuating grooves using a procedure of gradually increasing the size of the pressure attenuating grooves until a desired groove size is obtained.