| 摘要 |
PROBLEM TO BE SOLVED: To provide an apartment building intercom system capable of establishing a network in living room easily and transmitting the high-speed digital data from an external network by connecting a wireless LAN adaptor or a power-line modem to the high-speed transmission system in the existing interphone system. SOLUTION: The high-speed digital data transmission can be performed by interposing a digital signal superimposing/separating units 3 and 3a, and providing a controller 7, a controller side interface 5 between the external network or a living room side interface 5a in the living room when a video signal from a camera 4 installed in a collective entrance unit 1, a digital signal such as audio signal, a data signal such as external network connection signal are superimposed and transmitted to a twisted pair line as one or a plurality of frequency-spectrum-spread carriers. COPYRIGHT: (C)2008,JPO&INPIT
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