VIDEO SIGNAL BRANCHING METHOD AND INTERPHONE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an interphone system where the impedance is matched in the case of branching a video signal and attenuation in the video signal can be reduced. SOLUTION: The interphone system is provided with a transmission line 1 to transmit a video signal photographed by a camera 2 and with a plurality of video adaptors 4 each connected to each monitor 3 and to branch the video signal transmitted on the transmission line 1 to the monitor 3. The video adaptor 4 is inserted in the transmission line 1 and connects the transmission line 1 at the side of the camera 2 and the transmission line 1 only to the succeeding video adaptor 4 usually and connects the transmission line 1 at the side of the camera 2 and only the monitor 3 in the case of branching the video signal transmitted through the transmission line 1 to the monitor 3.