| 摘要 |
PURPOSE:To attain voice communication between mobile bodies during running by using the compression transmission system utilizing optical communication so as to attain corresponding between the mobile bodies. CONSTITUTION:In transmitting voice information from a cabin CT1 to a CR1, the cabin CT1 sets and ID code IDR predetermined and specific to the cabin CR1 and this code IDR is irradiated toward the cabin CT1 by optical transmission. After the code IDR is received, the cabin CR1 irradiates the IDR code toward the CT1 while being superimposed on the focus beam O2. The cabin CT1 receives the focus beam O1, and when the irradiated code IDR is coincident with the code IR irradiated before and the received level is high, that is, the light reception sensitivity is best (when optical axes are coincident), the cabin CT1 transmits a voice signal momentarily as a transmission light beam O2. |
