| 摘要 |
PROBLEM TO BE SOLVED: To provide a portable telephone set which can execute the off-hooking operation with high operability. SOLUTION: A sound detection means 13 judges whether an inputted signal is a sound signal or not. When it is the sound signal, a line connection signal is outputted to a control means 15. The control means 15 turns on a call switch 17 and connects a line. An on-hooking detection means 14 detects the on-hooking of an opposite party. When it is detected, a line cut signal is outputted to the control means 15 and the control means 15 cuts the line. |
