PORTABLE TERMINAL EQUIPMENT

摘要

Portable terminal equipment using a battery as a power source. The terminal equipment discriminates whether the battery voltage VB is lower than a voltage value V1 in a standby state or speaking state (ST1 and ST8). When the battery voltage VB is equal to the value V1, the user of the terminal equipment can call a subscriber and can speak with the subscriber for a fixed period of time. When VB < V1, the mode is shifted to a low-consumption standby mode in which the current consumption becomes lower (ST14). When the equipment is set to a service state, the equipment warns the user with a sound, etc., that the line will be disconnected a fixed period of time later (ST10) and, when the fixed period of time t2, for example, one minute has elapsed (ST12), the equipment disconnects the line and changes the mode to the low-consumption standby mode (ST14). Therefore, the user can originate another call after the disconnection of the line and the possibility of originating calls at necessary time increases. When a fixed period of time, for example, one minute has elapsed after the equipment is set by calling to a service state from the standby mode, the line is disconnected and the operation of the telephone set itself is stopped after the user is warned of the line disconnection with a sound, etc.