There are provided a mobile device that is equipped with a musical composition-reproducing section and capable of curtailing the battery drain as much as possible, and a mobile device that prevents the quality of reproduced musical tones from being degraded even if the voltage level of the battery lowers. The rectifier assembly includes an annular bus bar including an electrically conductive material, and an insulator ring receiving the annular bus bar. Finally, the present application describes methods of treatment using the compounds according to Formula I both alone and in combination with one or more additional therapeutic agents. An encryption stream index is then assigned to each access unit in the set of alternate access units in the current time slot, such that the encryption index increases over time. In this state, if no corresponding registration image data exists in the registration image data recording medium, image signal combining is not performed.