| 摘要 |
PURPOSE:To avoid malfunction even with the weak electric wave as well as to omit the zone discrimination in the zone transmission system by modulating the electric wave transmitted from the subject to be displayed with the tone signal corresponding to the information to be transmitted. CONSTITUTION:Displayed subject transmission means 3 receives the transmission wave of zone transmission means 1, and this received wave is modulated with the tone signal corresponding to the transmission information. Thus the information wave is transmitted. The transmitted information is received at zone reception means 2 and then transmitted to display means 5 for display. In such constitution, the output can be made faint greatly for both means 1 and 3, and at the same time the same frequency can be secured for the transmission waves of each means 1 and furthermore for the information waves. |
