A processing control method for a portable music playback apparatus includes the steps of determining whether a motion mode of the music playback apparatus is a steady-motion mode that is associated with motion of a user or an unsteady-motion mode that is not associated with the motion of the user by...http://www.google.de/patents/US20060276919?utm_source=gb-gplus-sharePatent US20060276919 - Music playback apparatus and processing control method
