Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Maki Yukawa

Kiyoyasu Maruyama

Chihiro Morita

Kosuke Yagi

Shigeo Ando

Katsuhiko Honda

Provided is a gateway device for interconnecting an IEEE1394 network and an IP network, which automatically detects and operates an AV device connected to the IEEE1394 network from a player device connected to the IP network, thereby enabling the player device to watch and hear contents stored in the AV device. The gateway device interconnects a network, to which an AV/C installed IEEE1394 device is connected, and a network, to which a player device compliant with a UPnP is connected, and includes: a conversion unit for converting Plug-and-Play processing of the IEEE1394 device to each step of Plug-and-Play of the UPnP; a conversion unit for converting an action of a UPnP AV to an AV/C command of the IEEE1394 device; and a stream transfer unit for transferring stream data transmitted from the IEEE1394 device to the IP network.

Gateway device

A second is counted at a step S, and an information table is read at a step S. Content change of the information table is checked at a step S. The content change is checked by checking the value of a CRC or checking content change of at least one of values of PIDs of an image, a sound and a PCR, stream types and descriptors, information necessary for operations of a receiver. When the contents of the information table are determined as changed by the aforementioned checking method (YES at the step S), a determination is made that change of a program is detected at a step Sand a program parameter described in the information table is set as a signal extraction parameter of a demultiplexer at a step S, for executing channel changing validating the signal extraction parameter set in the demultiplexer at a step S. Thus obtained is a digital broadcast receiving system capable of executing receiving in program change with no hindrance through a receiver having a relatively simple structure.

Digital broadcast receiving system

Growing community of inventors

Tokyo, Japan

Maki Yukawa