Patent ID: 8766877

Claim:
A communication system in a train, comprising: a plurality of cars, connected to form the train, each car having installed therein: a control data communication device, an image data communication device, and a display unit; wherein the train includes the plurality of control data communication devices, the plurality of image data communication devices, and the plurality of display units; wherein each image data communication device includes: a modem configured to modulate image data, the modem connected inside the image data communication device to a line branched from an image transmission path connecting image data communication devices from car to car, a hub connected to a plurality of train-mounted apparatuses including the display unit, and a control unit configured to control the modem and the hub, the control unit connected to the control data communication device in the same car by a first transmission path, and the control unit connected to another control unit in an adjacent car through the modem in the same car; wherein each display unit includes: a memory configured to store the image data, a screen configured to display the image data, and a controller configured to control the screen, so as to display any image data stored in the memory in accordance with train control information transmitted from the control data communication device through the image data communication device; wherein each control data communication device is connected by a control transmission path to a control data communication device in an adjacent car, so as to transmit and/or receive train control information between connected control data communication devices in adjacent cars; and wherein each image data communication device is: connected by the image transmission path to an image data communication device in an adjacent car, so as to transmit and/or receive image data between image data communication devices in adjacent cars, connected by the first transmission path to the control data communication device in a same car, so as to receive train control information from the control data communication device in the same car via the first transmission path, and directly connected by a second transmission path to the display unit in the same car, so as to directly transmit image data and train control information from the image data communication device to the display unit in the same car, via the second transmission path.