| 摘要 |
PROBLEM TO BE SOLVED: To easily check visitors by showing easily viewable images by efficiently transmitting image signals from a master unit of an intercom to several sub master units of the intercom when a slave unit makes a call. SOLUTION: The master unit of the intercom receives image signals from the slave unit of the intercom and wirelessly transmits image signals of one frame to a sub master unit No. 1 of the intercom. When the master unit receives next image signals, it wirelessly transmits image signals of another frame to a sub master unit No. 2 of the intercom. In a similar way, it wirelessly transmits image signals of another frame to a sub master unit No. 3 S of the intercom. The sub master units S of the intercom reproduce the received image signals and show images which are different from one another on monitors. COPYRIGHT: (C)2005,JPO&NCIPI
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