| 摘要 |
PURPOSE:To enable to confirm the incoming surely even under the situation when no callout bell sound can not be heard, by providing the transmitter attached to the telephone set and transmitting the callout signal in radio. CONSTITUTION:The radio transmitter 2 is fitted to the main body of the telephone set 1. The radio transmitter 2 detects the callout bell tone of the telephone set 1 and transmits the radio frequency signal modulated with the callout signal is transmitted from the antenna 3. The radio receiver 5 is provided near the user by opposing to the transmitter 2. This radio receiver 5 provides the antenna 4 and the speaker 6 as the callout informing unit. The radio frequency signal from the transmitter 2 is received with the antenna 4 to activate the speaker 6. Thus, the incoming call can be confirmed even under the situation when the callout bell tone of the telephone set 1 can not be heard. |
