| 摘要 |
PROBLEM TO BE SOLVED: To provide a telephone system which ensures a speech communication operation and also reduces power consumption when power interruption takes place. SOLUTION: This telephone system is provided with a power supply feeding part 105 ensuring power supply to a telephone terminal, a power supply controlling part 104 selecting a power supply (battery 106 or commercial power supply) to the telephone terminal and also adjusting its voltage, a power interruption detecting part 102 detecting power interruption and a central controlling part 103 which acquires information about the power interruption from the part 102, also detects a call out from the telephone terminal and controls the part 104 based on the results. |
