Abstract: A communication/broadcasting system provides a communication service and/or a broadcasting service between a communication/broadcasting center station and a mobile station and a fixed station present in a beam spot through orbiting satellites controlled by a satellite control station in order to prevent a degraded quality and permit users to receive the provision of the services at any location in a service area through the satellite positioned at an elevation angle suitable for communications/broadcasting. The orbiting satellite is switched to another at a timing at which the elevation angle can be kept high, thereby preventing a degraded quality of communications/broadcasting.

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: There is provided a communications-type car navigation system including a vehicle-mounted terminal and a server. When transferring, to the terminal, the result of a route searching which the server has performed, the server transfers the data that will satisfy the requirements of a route guiding method which the user wishes. Also, the server transfers the route data that has been compressed. Concerning the map data as well, the server transfers only the necessary attributes thereof. Moreover, the following conditions allow the operability to be enhanced: the selection of a map transferring method and the route guiding method where the driving state has been taken into consideration, and the selection of a guiding unit which the user wishes.

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: From a signal transmitted from a satellite, are extracted a position where a terrestrial station side system exists and a position of the satellite. A distance between the terrestrial station side system and the satellite, based on a difference of those positions. Then, a sum of the distance between the terrestrial station side system and the satellite and a distance between the satellite and a mobile station side system, based on a difference between the reception time when a mobile station side communication antenna receives the signal and the transmission time. Further, the distance between the mobile station side system and the satellite is obtained by subtracting the distance between the terrestrial station side system and the satellite from the obtained sum. And, based on the distance between the mobile station side system and the satellite, the position where the mobile station side system exists is obtained.

Abstract: From a single transmitted from a satellite, are extracted a position where a terrestrial station side system exists and a position of the satellite. A distance between the terrestrial station side system and the satellite, based on a difference of those positions. Then, a sum of the distance between the terrestrial station side system and the satellite and a distance between the satellite and a mobile station side system, based on a difference between the reception time when a mobile station side communication antenna receives the signal and the transmission time. Further, the distance between the mobile station side system and the satellite is obtained by subtracting the distance between the terrestrial station side system and the satellite from the obtained sum. And, based on the distance between the mobile station side system and the satellite, the position where the mobile station side system exists is obtained.

Abstract: From a signal transmitted from a satellite, are extracted a position where a terrestrial station side system exists and a position of the satellite. A distance between the terrestrial station side system and the satellite, based on a difference of those positions. Then, a sum of the distance between the terrestrial station side system and the satellite and a distance between the satellite and a mobile station side system, based on a difference between the reception time when a mobile station side communication antenna receives the signal and the transmission time. Further, the distance between the mobile station side system and the satellite is obtained by subtracting the distance between the terrestrial station side system and the satellite from the obtained sum. And, based on the distance between the mobile station side system and the satellites the position where the mobile station side system exists is obtained.

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: With regard to electric-power-supply control, there is provided an electric power supply control system for implementing load control used to be executed for each individual customer consuming electric power as coordinated control for all customers and for selecting an optimum electric-power supplier in case there are a plurality of electric-power suppliers supplying electric power to the customers.