| 摘要 |
PURPOSE:To improve the function for prevention of crimes, by setting a picture receiver and a master device containing an interphone handset at the indoor side and at the same time setting an interphone slave device and a TV camera at the outdoor side respectively. CONSTITUTION:The main body 6 of a TV interphone device consists of a handset 2 serving as a master device of an interphone and a picture receiver and set at a prescribed position at the indoor side A. While a calling device 8 serving as an interphone slave device and a TV camera 3 are set at the outdoor side B. The camera 3 and the receiver 1 as well as the device 8 and the handset 2 are connected to each other via cables 5. A sensor 4 is set close to the device 8, and the signal of the sensor 4 is superposed on the cable 5 connecting the camera 3 and the receiver 1. Thus the state of a visitor X is detected to improve the performance for prevention of crimes. For instance, the sensor 4 has a function to detect a metallic matter such as a gun, etc. |
