This invention relates to a karaoke CD format and a device for controlling audio signals utilizing the karaoke CD format which provides a user with selective reproduction of the voice of a player. In addition, at least one baffle plate, which serves to deflect particles and can simultaneously be configured as a cooling panel for cooling electronic components, is preferably located in the flow region of the air intake slots. The portable terminal has an opening for installing the exposure window and the housing holder is coupled to a peripheral portion of the opening. The cell movements can be squared in calculating the stability value. After the last message segment has been processed, the adding circuit preferably adds the high order portion of the register to the low order portion and adds back any carry bit generated thereby to produce a checksum value that may be loaded into the given message. When the circular polarizer is used, the visibility and color tone of the reflective liquid crystal display may be improved.