| 摘要 |
PROBLEM TO BE SOLVED: To provide a video doorphone for multiple dwelling house that can adopt a color monitor or a black/white monitor for a monitor for a master set in a living room. SOLUTION: This video doorphone for multiple dwelling house, where a multiple entrance slave set 1 is connected to living room master sets 22a, 22b, 22c, etc., via a master set 21 and a video image of a visitor picked up by a color camera section 2 of the multiple entrance slave set is displayed on monitors 23a, 23b, 23c, etc., of the living room master sets, when the visitor depresses a call button 14 of the multiple entrance slave set, is provided with a cross-reference table 16 between the living room master set number of the living room master sets and a monitor type code M, denoting whether a monitor of the living room master set is a color monitor or a black white monitor and with a video image selection circuit 7, that reads the living room master set number of the living room master set called from the multiple entrance slave set and the monitor type code form the cross-reference table and provided an output of a color video signal, when the monitor type code indicates a color monitor or an output of a black/white video signal, when the monitor type code indicates a black white monitor.
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