摘要 |
The present invention is a transmission system in which there are provided a bridge circuit in which a balanced condition is provided in an entire frequency band usable for a wire transmission line or a portion thereof, and a cancelling circuit in which a simultaneous two-directional communication is enabled by using the same frequency or the frequency adjacent thereto, and there are provided said cancelling circuits at both terminal devices opposite to each other through a transmission line, thereby enabling said simultaneous two-directional communication.
|