Hitachi, Ltd.

Hidefumi Gotou

Tsukasa Hasegawa

Shinichiro Fukushima

Takahiko Nozoe

An IRDsupplies broadcasting data on a bus in a desired time period. When the IRDperforms a reservation of the bus usage, the IRDrequests current bus usage information and information of the bus reservation from all devices connected by the bus, such as a DVD, a D-VTR, a D-VTR, a CAM, a TV, and a isochronous managerof the D-VTR. The isochronous managerand each device answer by sending the bus usage information and reservation information to the IRD. The IRDjudges a possibility of the reservation from the answer information. If the reservation is possible, it performs the reservation operation. If the reservation is impossible, then the reason is displayed on a TV. Therefore, it is possible to prevent a usage of a device that excesses the bus transferring capacity.

Electronic device, method for using electronic device, and electronic device system for reserving bus usage time on a bus to conduct communications between electronic devices

An IRD supplies broadcasting data on a bus a desired time period. When the IRD performs a reservation of the bus usage, the IRD request current bus usage information and information of the bus reservation from all devices connected by the bus, such as a DVD , a D-VTR , a D-VTR , a CAM , a TV , and a isochronous manager of the D-VTR . The isochronous manager and each device answer by sending the bus usage information to the IRD and reservation information. The IRD judges a possibility of the reservation from the answer information. If the reservation is possible, it performs the reservation operation. IF the reservation is impossible, then the reason is displayed on a TV . Therefore, it is possible to prevent a usage of a device that excesses the bus transferring capacity.

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Yokosuka, Japan

Hidefumi Gotou