A signal processing apparatus and a control method thereof are provided. For example, the present invention relates to a novel approach for examining the resistance to peel force required to remove a pressure sensitive adhesive label from its intended substrate. The arm is positioned forward of, or immediately adjacent to, the lowest part of the harvester which includes a cutter assembly for cutting and separating the crop. The dialogue provides the telephonic network the content, the sender ID and the address information of each short message, stores the content and address information in a database, and displays the content of the messages on the telephone display of each destined subscriber. In the MOSFET, the saturation current is reduced while avoiding creation of hot carriers.