Abstract: A method and apparatus controls an MTP device to manage a media file transmitted by an MTP host. According to the method, when the number of files in a folder assigned by the MTP host is equal to or more than a predetermined number while storing a media file received from the MTP host, the MTP device generates a new folder and stores the corresponding media file in the new folder. Accordingly, the files within the predetermined number can be stored in one file. Since the number of files stored in one folder is limited, delay in processing media files due to the large number of files can be reduced.

Abstract: A power management method in a portable electronic device includes storing a plurality of pieces of sub-state information indicating setting states of functions from a user interface (UI) of the portable electronic device, constructing a field by combining sectors, each formed with a predetermined number of bits, indicating the plurality of pieces of sub-state information, analyzing the sub-state information of the field, and selecting a clock frequency corresponding to the analyzed field from among clock frequencies pre-set to operate a central processing unit (CPU) of the portable electronic device and applying the selected clock frequency to the CPU. Accordingly, by combining information on sub-states indicating functions currently set in a portable electronic device in order to construct a field and selecting a clock frequency optimal for the field, an unnecessary increase of a CPU clock frequency in multi-tasking can be prevented, and power of a CPU can be efficiently managed.

Abstract: A method and apparatus controls an MTP device to manage a media file transmitted by an MTP host. According to the method, when the number of files in a folder assigned by the MTP host is equal to or more than a predetermined number while storing a media file received from the MTP host, the MTP device generates a new folder and stores the corresponding media file in the new folder. Accordingly, the files within the predetermined number can be stored in one file. Since the number of files stored in one folder is limited, delay in processing media files due to the large number of files can be reduced.

Abstract: An audio-book playback method includes buffering text data that is to be played back by speech, converting the buffered text data to speech data, performing speech-playback by using the speech data, and buffering next text data for continuous playback. The provided audio-book playback method and an apparatus enable a user to enjoy reading a book while also listening to content of the book being voiced by a multimedia playback device. Moreover, double buffering technology is employed to provide seamless text and speech-playback services.

Abstract: A power management method in a portable electronic device includes storing a plurality of pieces of sub-state information indicating setting states of functions from a user interface (UI) of the portable electronic device, constructing a field by combining sectors, each formed with a predetermined number of bits, indicating the plurality of pieces of sub-state information, analyzing the sub-state information of the field, and selecting a clock frequency corresponding to the analyzed field from among clock frequencies pre-set to operate a central processing unit (CPU) of the portable electronic device and applying the selected clock frequency to the CPU. Accordingly, by combining information on sub-states indicating functions currently set in a portable electronic device in order to construct a field and selecting a clock frequency optimal for the field, an unnecessary increase of a CPU clock frequency in multi-tasking can be prevented, and power of a CPU can be efficiently managed.