Abstract: A memory control device includes a CPU, a flash ROM that records therein first information having undergone an error-correction coding process and second information not having undergone an error-correction coding process, an address line switch that switches between a first path that connects an address bus to the ROM so that the CPU can read the first information and a second path that connects the address bus to the ROM so that the second information can be erased, written, and read, a decoder that performs error correction on the first information and performs decoding, and a second switch that switches between a third path that connects the decoder to the data bus so that information decoded by the decoder is transmitted to the data bus and a fourth path that connects the ROM to the data bus so that the second information can be erased, written, and read.

Abstract: The present invention provides an IP address delivery system comprising: an IP address delivery apparatus including a path-information reading unit configured to read, from an IP address request signal, path information of a communication network extending to a request source of an IP address, an IP address correspondence table in which a correspondence relation between the path information and the IP address is registered, and an IP-address determining unit configured to determine, based on the path information obtained from the path-information reading unit and the IP address correspondence table, an IP address delivered to the request source; and a path-information granting unit configured to grant the path information to the IP address request signal.

Abstract: A delivery control central device installed in a lead car of a train delivers video information including moving image information and still image information to a delivery control terminal device of each subsequent car via an inter-car transmission path. The video information is delivered based on video content and a content display schedule that are both wirelessly received from a ground station through a transceiver device. The delivery control terminal device of each car is sequentially connected to the delivery control terminal device of an adjacent car, sequentially delivers the delivered video information to the adjacent car, and delivers the delivered video information to a video output device via an in-car transmission path inside its own car. A video output device generates video signals from the delivered video information, outputs the video signals to a display device, and displays the video signals by the display device.

Abstract: A train communication system includes a communication relay device that is installed in each vehicle and a communication terminal device that is connected to the communication relay device. The communication relay device acquires vehicle information indicating an in-formation position of a vehicle in which the communication relay device is installed. The communication terminal device refers to a correspondence table that defines a correspondence relationship between vehicle information and communication identification information, and determines communication identification information to be provided to the communication terminal device, based on vehicle information obtained from the communication relay device.

Abstract: A path-information obtaining unit obtains a piece of path information of a communication network by inquiring a port number of an Ethernet switch that transmits a MAC address of a request source of an IP address. An IP-address specifying unit specifies an IP address that corresponds to the piece of path information of the communication network by referring to an IP-address correspondence table, and distributes the specified IP address to the request source of an IP address.

Abstract: A passenger information control device having a video display controller that transmits video data sent from a ground transmission controller to display devices in a train includes: a storage unit that stores a program table and the video data, the program table storing a number of times an advertisement video has been presented, a validity period of the advertisement video, a time period from the last presentation time to the present, and a volume of the video data, being associated with each advertisement; a deletion determining unit that determines whether to designate the video data as a candidate for deletion based on a program table; and a deleting unit that deletes the video data stored in the storage unit based on determination by the deletion determining unit.

Abstract: When data is transmitted from a first communication terminal to a second communication terminal, a communication relay device converts car identification information of a communication source of communication-source identification information included in a communication packet into a car number of a vehicle, and transmits the data to an inter-vehicle communication path. When data is transmitted from the second communication terminal to the first communication terminal, the communication relay device converts car identification information of a communication destination of communication-destination identification information included in a communication packet into a “0”-th car indicating own car, and transmits the data to an in-vehicle communication path.

Abstract: [Problem] To obtain an on-train video information delivery control and display system that is capable of efficiently delivering moving images and still images by digital transmission and providing moving images and still images to passengers inside a train passenger compartment while avoiding cost increase and without having to divide the transmission path of the moving images and still images.

Abstract: A rotary magnetic head device has a plurality of bobbins to which coils are respectively fixedly attached, and a place spring fixedly attached to the bobbins. The plate spring has a plurality of front ends to which magnetic heads are respectively fixed. The magnetic heads are held in such a manner that, when a current is selectively supplied to one or more of the coils, the respective one or more of the magnetic heads independently moves in the axial direction. A rotary magnetic head device has a head supporting base plate, and a head supporting table which is tilted by an angle with respect to the head supporting base plate. The tilt angle is adjusted by moving the head supporting table. In a rotary magnetic head device, the position in the axial direction of a magnetic head is detected, and the level of a current to be supplied to a coil is adjusted on the basis of the detection result.

Abstract: A rotary magnetic head device has a plurality of bobbins to which coils are respectively fixedly attached, and a plate spring fixedly attached to the bobbins. The plate spring has a plurality of front ends to which magnetic heads are respectively fixed. The magnetic heads are held in such a manner that, when a current is selectively supplied to one or more of the coils, the respective one or more of the magnetic heads independently move in the axial direction. A rotary magnetic head device has a head supporting base plate, and a head supporting table which is tilted by an angle with respect to the head supporting base plate. The tilt angle is adjusted by moving the head supporting table. In a rotary magnetic lead device, the position in the axial direction of a magnetic head is detected, and the level of a current to be supplied to a coil is adjusted on the basis of the detection result.