Patent ID: 8214864
Filing Date: 2012-07-03
Classification: B61D,B61L,H04H,H04N

Abstract:
1. An on-train video information delivery control and display system comprising: a transceiver device that is installed in a lead car configuring a train and wirelessly receives, from the ground, video information including moving image information and still image information and a display schedule of the video information; a delivery control central device that is installed in the lead car and delivers the video information received by the transceiver device and control commands that control display of the video information generated on the basis of the received display schedule; a delivery control terminal device that is installed in each car configuring the train, with the delivery control terminal devices being sequentially connected by an inter-car transmission path, receives the video information and the control commands delivered from the delivery control central device, sequentially delivers the received video information and control commands to an adjacent car, and also delivers the received video information and control commands to the inside of its own car, thereby delivering the video information and the control commands to all of the cars; a video output device that is connected by an in-car transmission path to the delivery control terminal device in each of the cars, receives the video information and the control commands delivered from the delivery control terminal device, and generates and outputs video signals on the basis of the received video information and control commands; and a display device that is connected by a video signal transmission path to the video output device in each of the cars and displays the video signals outputted from the video output device, wherein: an amount of data accumulated inside a buffer of the delivery control terminal device becomes larger the closer the delivery control terminal device is to the delivery control central device and becomes smaller the farther away the delivery control terminal device is from the delivery control central device, when the amount of data accumulated in the buffer of the delivery control terminal device is above an upper limit, overflow information is generated, when the amount of data accumulated in the buffer of the delivery control terminal device is below a lower limit, underflow information is generated, and the delivery control central device: controls delivery of the video information according to the overflow information of the delivery control terminal device closest to the delivery control central device and the underflow information of the delivery control terminal device farthest away from the delivery control central device among the delivery control terminal devices sequentially connected, controls delivery of the moving image information to the video output device according to a status of a buffer of the video output device inside its own car, and delivers display commands for instructing timing of displaying a moving image to the video output devices inside the respective cars at once in preference to delivery of the moving image information.