A spread spectrum modulation unit performs spread spectrum clocking processing for a basic clock signal synchronized with the carrier frequency or its harmonic frequency of image information leaked from an unwanted electromagnetic wave. By implanting ions into a substrate that is later thermally oxidized, a number of temporary charge trapping sites can be established above a channel region of a transistor. The damping elements of the adjacent air treatment chambers are not in alignment. Discharging the voltage of each secondary battery unit is at first performed through the discharge path of a smaller resistance value. The first bandgap region defines a first optical bandgap of the optical heterostructure. it behaves as if it had generated the message.