| 摘要 |
PROBLEM TO BE SOLVED: To provide an interphone system in which a television receiver on the market is used for the original purpose of television broadcasting, etc., and also can be used as an external monitor. SOLUTION: An interphone master unit 1 incorporates a remote controller R1 for transmitting a control signal and controlling the operation of the television receiver 3. When the camera 2 of a doorphone slave unit 2 starts photographing, the master unit 1 turns on the television receiver 3 with the built-in remote controller R1 and on the other hand, when the camera of the slave unit 2 finishes photographing, the master unit 1 turns off the television receiver 3 with the built-in remote controller R1.
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