| 摘要 |
PROBLEM TO BE SOLVED: To ensure an excellent image during a call in an image output state and to apply lighting/put out lights control to a gate light by transmitting detec tion information such as lightness of a house entrance or the like into a house. SOLUTION: A call signal outputted through the operation of a call button 10 of a slave set 1 in an image output state and detection information of lighting/put out lights of a display light 20 driven on the basis of information such as lightness at a house entrance detected by an environment sensor 19 are superimposed in different timing only for a blanking period of a video signal outputted from a camera 12 as a positive voltage higher than a white peak of the video signal and transmitted to a demodulation circuit 32 of a master set 2. The demodulation circuit detects the demodulated output of the call signal during a call in the image output state and of the detection information on the basis of the positive voltage. Thus, an image of a visitor during a call in the image output state is displayed by a monitor unit 36 as an excellent image and a gate light 3 is lighting/put out lights controlled based on the detection information.
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