| 摘要 |
PURPOSE:To prevent call-loss by providing an alarm tone generation part to generate an alarm tone according to a detection signal from a ringing signal detection part connected to the top of a cord, and a ringing signal alarm device having a ringing signal generation part and a battery for supplying power to the alarm tone generation part. CONSTITUTION:The ringing signal alarm device houses a ringing signal detection part 1 and a battery 4 in one case and is connected to an alarm tone generation part 2 by a cord 3, and the cord 3 contains a detection signal line from a call detection part 1 and a power supply line to the alarm tone generation part 2. Ringing signals from a main body are collected by a microphone 5 of the ringing signal detection part 1, and a detection circuit 8 detects the generation of the ringing signal. The detection signal from the detection circuit 8 is inputted through the connecting cord 3 to an alarm signal generation circuit 9 of the alarm tone generation part 2, and an alarm signal is generated by the alarm signal generation circuit 9 receiving the detection signal, amplified by an amplifier circuit 10 and outputted from a loudspeaker 11 as an alarm tone. Thus, call-loss can be prevented. |
