| 摘要 |
PROBLEM TO BE SOLVED: To provide an incoming call notification device for the mobile radiophone which is extremely small in the possibility of malfunction due to urban noises since the user is annoyed by false incoming call notification and feels troublesome and then time or mental loss is large if the incoming call notification device informing the user that a signal arrives at the mobile radiophone from a base station and the telephone set responds to the urban noise. SOLUTION: The continuance of the urban noises is nearly 1-2 seconds. The incoming call notification device is provided with a control circuit means including a timer so that a notifying operation signal is allowed to be generated only when a signal detected by the incoming device 100 lasts exceeding a specific time (>=2 seconds, preferably, 3-5 seconds). This constitution can reduce malfunction of both a digital telephone set which uses a time-division response signal and an analog telephone set which uses a continuous response signal. |
