COMMUNICATION SYSTEM IN VEHICLE AND VEHICLE MOUNTED UNIT

摘要

PROBLEM TO BE SOLVED: To provide a communication system in vehicle and a vehicle mounted unit in which a high transmission rate can be realized without increasing the number of transmission lines.

SOLUTION: A vehicle mounted unit M1 (M11-M15) being connected with a transmission line L comprises only a baseband communicating section 1 for transmitting/receiving an unmodulated digital signal (baseband signal) and a vehicle mounted unit M2 (M21-M23) being connected with the same transmission line L comprises a modulation wave communicating section 3 for transmitting/receiving a modulated digital signal (modulation signal) in addition to the baseband communicating section 1. All vehicle mounted units M1, M2 provided with the baseband communicating section 1 form a first communication network for transmitting/receiving a baseband signal through the transmission line L, and the vehicle mounted units M2 provided with the modulation wave communicating section 3 form a second communication network for transmitting/receiving a modulation signal through the same transmission line L.

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