| 摘要 |
PURPOSE:To obtain a titled device at a low cost by utilizing a television community receiving equipmeht, and executing a mutual information between mutual terminals converted to a group. CONSTITUTION:A frequency band which is different from a channel frequency band of a television signal from a head is assigned as a channel frequency band of a mutual inforting signal, to terminal units 4a-4h of a group A and terminal units 5a-5h of a group B, respectively, which have been grouped by a position of boundary units 9a-9c inserted into a transmission line 1 from the head. Also, an intrinsic channel number of a mutually different frequency band is assigned to each of the terminal units 4a-4c, 5a-5c of the groups A, B, therefore, a mutual information between each terminal which has been converted to a group can be executed by using an intrinsic channel frequency. |
