Abstract: In an advertising system where contents to be displayed are sent to display devices by digital broadcasting and the contents are displayed on sheet-shaped visual display units, when data update complete reply messages for confirming that specified advertisement has been displayed are communicated, channel congestion may arise due to simultaneous replies sent from a great number of information display devices. A display confirmation server is provided for confirming that information display has been updated on each information display device. Each information display device sends a reply message that display has updated to information received by digital broadcasting to the display confirmation server. At this time, each information display device waits for a randomly set wait time after changing information display before sending the reply. The display confirmation server that received the reply messages from the display devices reports data update complete on behalf of the display devices.

Abstract: Provided is a digital broadcast receiving device (20) which can display a high resolution image longer without burdening users with a cumbersome operation. The digital broadcast receiving device (20) of the present invention switches, based on vehicle information, between switching thresholds by which switching is made between plural digital broadcast decoders outputting different digital broadcast images from one another in accordance with a reception state of digital broadcast waves. The plural digital broadcast decoders include, for example, a stationary reception decoder (200), which outputs a digital broadcast image for stationary receivers, and a mobile reception decoder (201), which outputs a digital broadcast image for mobile receivers.

Abstract: A digital broadcast receiver (mobile's receiver terminal) 1 for receiving a digital broadcast signal DS carrying many contents and also outputting the content based on thus received digital broadcast signal DS, including a content accumulation portion (database) 1c for accumulating received contents, a reception state detection portion for detecting whether the digital broadcast signal DS can be received normally, and a switch-over portion (reproduction/switch-over portion) 1b for switching from output of the content received to reproduction of the content accumulated in the content accumulation portion 1c if the reception state detection portion detects that the digital broadcast signal cannot be received normally.

Abstract: A digital broadcast receiver (mobile's receiver terminal) 1 for receiving a digital broadcast signal DS carrying many contents and also outputting the content based on thus received digital broadcast signal DS, including a content accumulation portion (database) 1c for accumulating received contents, a reception state detection portion for detecting whether the digital broadcast signal DS can be received normally, and a switch-over portion (reproduction/switch-over portion) 1b for switching from output of the content received to reproduction of the content accumulated in the content accumulation portion 1c if the reception state detection portion detects that the digital broadcast signal cannot be received normally.

Abstract: In the digital broadcast to a mobile unit, the continuous reproduction of an image cannot be guaranteed when switching the hierarchical level in accordance with the receiving condition of the radio wave and therefore the viewer has a sense of discomfort. A digital broadcast sending apparatus sends out by encoding a plurality of simultaneous broadcast streams in the same sync signal generator. A switching determination unit of the receiving apparatus switches the plurality of simultaneous broadcast streams in accordance with the receiving condition (weak hierarchical level/strong hierarchical level), and a sync adjustment unit continuously displays an image without interruptions based on the received sync signal. At the time of this switching operation, one stream is gradually switched to the other.

Abstract: A broadcast content that is at least a part of an original content is broadcasted, and a differential content, which is at least a part of the original content, is transmitted in response to a request from a reception terminal. The differential content and the broadcast content are merged with each other to reproduce a perfect original content. Therefore, the perfect original content can be obtained at low price and in short time even when the original content contains a large amount of data.

Abstract: An advertising system includes advertising data reception device which receives advertising request data at a data center from shops, a database which stores such data, a data converter which converts those data in a certain format, and a data transmission device for transmitting the converted data via a data distribution infrastructure, that provides an advertiser who is not familiar with know-how of advertising distribution with benefit to distribute advertising to public transportation through simple procedures. In addition, since advertising information such as time-limited services may easily be changed in real time by the advertiser, distribution of advertising according to needs becomes possible. It will be possible to provide passengers of the public transportation with distribution of advertising that is attractive.

Abstract: In order to effectively use a band and securely transmit emergency information such as information of disasters because such information needs to be securely provided to a user most preferentially via a digital broadcasting receiver held by the user even when the user is outside, digital data is multiplexed on the basis of transmission volume of the digital data, and data type, priority and data effective time as attributes of the digital data, and the multiplexed digital data is transmitted.

Abstract: In order to provide an advertisement delivering system that can deliver advertisement information together with detailed advertisement information and current vehicle positional information, the advertising center adds associated information such as map information (latitude and longitude) and URL or portal site information that the information provider has to AD information. With this, the advertising center can utilize AD information more effectively. Consequently, the system can expect more information receivers and providers and expansion of the AD business.

Abstract: A digital broadcast receiving method, in which a digital broadcast signal, including layers each obtained by dividing a transmission bandwidth into a plurality of segments and combining some of the segments, is received, and images and/or sound are output from one of the layers constituting the received digital signal. The digital broadcast receiving method includes detecting a field strength and/or detecting a reproduction condition of each layer of the received digital broadcast signal, determining which layer to output based on the detected field strength and/or the detected reproduction condition, and switching the output layer to the determined layer based on a broadcasting format, for each layer, of each broadcast station.

Abstract: A digital broadcast receiving apparatus receives a digital broadcast signal, which consists of layers each obtained by dividing a transmission bandwidth into a plurality of segments and combining some of the segments, and outputs images and/or sound from one of the layers constituting the received digital signal. This apparatus is characterized by comprising broadcasting format retention means (channel to broadcasting format correspondence table database) for retaining the broadcasting format, for each layer, of each broadcast station and switching means (layer switching means) for switching the output layer based on the broadcasting format, for each layer, of each broadcast station retained in the broadcasting retention means. Thus, this apparatus can output images and sound without interruption.

Abstract: A digital broadcast receiver (mobile's receiver terminal) 1 for receiving a digital broadcast signal DS carrying many contents and also outputting the content based on thus received digital broadcast signal DS, including a content accumulation portion (database) 1c for accumulating received contents, a reception state detection portion for detecting whether the digital broadcast signal DS can be received normally, and a switch-over portion (reproduction/switch-over portion) 1b for switching from output of the content received to reproduction of the content accumulated in the content accumulation portion 1c if the reception state detection portion detects that the digital broadcast signal cannot be received normally.

Abstract: In a receiving terminal, while a dropout of digital data is predicted which is caused by an instantaneous interruption of digital broadcasting electromagnetic waves, such digital data whose dropout may be predicted is previously acquired via a communication from a broadcasting station, or via a broadcasting electromagnetic wave. Then, the acquired digital data is stored on the side of the receiving terminal. When a dropout of digital data actually occurs, this dropped digital data is interpolated based upon previously prepared interpolation data on the side of the receiving terminal so as to prevent an interruption of the digital broadcast. When the dropout of the digital data is predicted, it is not only predicted that the digital data is completely dropped, but also such a condition where a dangerous state is expected is predicted with margin.

Abstract: In a receiving terminal, while a dropout of digital data is predicted which is caused by an instantaneous interruption of digital broadcasting electromagnetic waves, such digital data whose dropout may be predicted is previously acquired via a communication from a broadcasting station, or via a broadcasting electromagnetic wave. Then, the acquired digital data is stored on the side of the receiving terminal. When a dropout of digital data actually occurs, this dropped digital data is interpolated based upon previously prepared interpolation data on the side of the receiving terminal so as to prevent an interruption of the digital broadcast. When the dropout of the digital data is predicted, it is not only predicted that the digital data is completely dropped, but also such a condition where a dangerous state is expected is predicted with margin.

Abstract: A digital broadcast receiver (mobile's receiver terminal) 1 for receiving a digital broadcast signal DS carrying many contents and also outputting the content based on thus received digital broadcast signal DS, including a content accumulation portion (database) 1c for accumulating received contents, a reception state detection portion for detecting whether the digital broadcast signal DS can be received normally, and a switch-over portion (reproduction/switch-over portion) 1b for switching from output of the content received to reproduction of the content accumulated in the content accumulation portion 1c if the reception state detection portion detects that the digital broadcast signal cannot be received normally.

Abstract: An information transmission system, for transmitting data relating to a plan and destination of traveling prepared in advance, depending upon the destination and time on the travel, by using a portable terminal having transmission function of data, comprising a portable terminal, and a travel server memorizing personal data and various kinds of data therein, wherein the travel server produces travel information necessary for the travel to each person, upon the basis of the personal data including destination information of travel, and the various kinds of data, and transmit it from the travel server to the portable terminal, depending upon location information of the portable terminal and time information programmed in advance, thereby enabling the traveler to obtain the necessary information at the destination on traveling, so as to carry out activities, smoothly, on the day.

Abstract: A broadcast content that is at least a part of an original content is broadcasted, and a differential content, which is at least a part of the original content, is transmitted in response to a request from a reception terminal. The differential content and the broadcast content are merged with each other to reproduce a perfect original content. Therefore, the perfect original content can be obtained at low price and in short time even when the original content contains a large amount of data.