| 摘要 |
PROBLEM TO BE SOLVED: To record the message of a visitor when a resident is out, to listen to the message of the visitor as needed and to recognize conditions during absence by providing a sound recording function inside a door interphone reception part connected to a doorbell. SOLUTION: The transmission part 1 of a door interphone is provided with the doorbell 2, a speaker 3 and a microphone 4. A reception part 6 is provided with a recording part 9 and a reception transmission part 8 and it is further constituted of a receiver 10, a speaker 7 and an operation button 11. At the time of use, the visitor makes communication through the doorbell 2 to the transmission part 1 of the door interphone provided on an entrance. Then, the voice of the visitor is transmitted through a line 5 to the reception part 6 and the communication is performed with the resident by the receiver 10. When the resident is out, the voice of the visitor is received by the reception transmission part 8 and then recorded in the recording part 9. Thereafter, the resident reproduces the message of the visitor by the operation button 11 and listens to it by the speaker 7.
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