| 摘要 |
PURPOSE:To enable data transmission to personal stations even they are in remote places by transmitting data sent from a center station to a local station and sending the data from the local station to a personal station by FM waves. CONSTITUTION:The center station 1 is provided with two sending systems, i.e. a system that performs data transmission from a sending section 1d by FM waves and a system that performs data transmission from a modulator section 1c through a signal line l1 using a lamp wire. The transmission frequency of the sending section 1d consists of four channels, and can send different data simultaneously to each personal station for each frequency. There are the center station for character type and for LED type. When sending a message to a specific personal station, the content is selected by a CPU and sent out from the center station 1 as a data signal. In this case, if the objective personal station is in remote place, the message can be transmitted through a local station 2 that acts as a repeater. If the objective station is near, transmission is made possible by receiving radio waves transmitted from the center station 1. |
