The present invention relates to an implementation for cooling and positioning prismatic battery cells. The engine 10 comprises a supercharger 11 and an exhaust gas recirculation device 12. An operative element is disposed such that movement of the operative element is restricted by an inside wall of a terminal leading portion of the base body and by leg portions of a leaf spring. The input signal is sampled, and half-chip offset samples are formed from the sampled input signal. Therefore, according to the present invention, the improved performances of the noise cancellation systems can be provided compared with the conventional active noise cancellation system which uses the LMS adaptive algorithm.