Abstract: An apparatus that does not cause inconsistency between an original picture and an image for performing operations under a special playback mode. A transport stream from a receiver is supplied to a converter. The converter generates a data stream for normal playback. If a desired service contains control data for an interactive operation, a data stream for normal playback containing the control data is generated. Packets required for performing the special playback are selected to generate a data stream for the special playback. None of the control data is contained in the special playback stream. The normal playback stream and the special playback stream are recorded on a recording medium. In the normal playback mode, reproduction under an interactive manner is performed in accordance with the control data for the interactive operation. No inconsistency is produced between the original picture and the image for performing the operations because none of the image for the interactive operation is displayed.

Abstract: It is an object of the present invention to provide an apparatus not causing inconsistency between the original picture and the image for performing the operations even under the special playback mode. A transport stream from a receiver 34 is supplied to a converter 36. The converter 36 generates a data stream for normal playback. If a desired service contains control data for interactive operations, a data stream for normal playback containing the control data is generated. Also, selecting packets required for performing special playback generate a data stream for special playback. None of the control data is contained in the stream for special playback. Both the stream for normal playback and the stream for special playback are recorded on a recording medium44. In the normal playback mode, reproduction under interactive manner is performed in accordance with the control data for interactive operation.

Abstract: A data broadcast receiving apparatus includes a storage controlling unit and a reproduction controlling unit. The storage controlling unit stores data modules among a plurality of data modules included in received broadcast data, into a module storing unit and also stores storage information for each of the plurality of data modules into a storage information storing unit, the storage information showing the presence or absence of the data module in the module storing unit, a reason of the absence of the data module, and the like. When the user selects a data module as a reproduction target, the reproduction controlling unit judges whether the data module is stored unit, based on storage information of the data module. If the data module is not stored, the reproduction controlling unit displays a message informing the user of the fact and reason that the data module is not stored.

Abstract: When a program transmission apparatus divides a program into a plurality of partial programs before transmission, a program reception execution apparatus executes a partial program when the partial program has already been received, and, when the execution needs to proceed to from a present partial program to a next partial program, executes the other partial program when the next partial program has been received.

Abstract: A transmission/reception system for data broadcast comprising: a transmission apparatus transmitting audiovisual stream data for a series of plural programs and plural data broadcasting contents relating to programs, which are multiplexed to each other, and a receiving apparatus receiving the audiovisual stream data and presenting the corresponding program, while superimposing and presenting the data broadcasting content to the audiovisual data. The transmission apparatus starts to transmit the data broadcasting content relating to the program 2, before the time “t0” when audiovisual data should change from the program 1 to 2, and transmits the presentation start instruction message at “t0”. While, the receiving apparatus receives the data broadcasting content relating to the program 2, and performs a process for forming an image, and invisibly presents the data broadcasting content.

Abstract: When a program transmission apparatus divides a program into a plurality of partial programs before transmission, a program reception execution apparatus executes a partial program when the partial program has already been received, and, when the execution needs to proceed to from a present partial program to a next partial program, executes the other partial program when the next partial program has been received.

Abstract: A fixed form data broadcast playback apparatus 5 of the present invention has fixed form data broadcast playback means 108 that inserts predetermined data to fixed form data 300 from fixed form data storing means 111 with data inserting means 110, makes the resultant data into an MPEG transport stream by MPEG-TS means 109 and playbackly transmits the resultant to a digital broadcast receiver 3 via a digital interface 320. This construction enables to operate the fixed form data broadcast playback apparatus 5 even from a digital broadcast receiver that does not have a control function to the fixed form data broadcast playback apparatus 5, and further, enables to unify the operability of the screen and remote controller between the digital broadcast receiver 3 and the fixed form data broadcast playback apparatus.

Abstract: A manager or an issuer issues a participation certificate, for an ordinary user who will newly join a group formed on a network made up of specified users, on which said manager or issuer creates a digital signature by the use of a private key of the group. Members belonging to said group authenticate one another as belonging to the same group and as authorized members of the group, on the basis of their respective participation certificates.

Abstract: A broadcasting system which includes a broadcasting apparatus and a reception apparatus and which achieves interactiveness using a broadcast wave. The broadcasting apparatus includes a content storing unit for storing the plurality of contents, each content including a set of video data and a set of control information that indicates another content that is a link destination for a present content, and a transmitting unit for multiplexing a set of video data and a plurality of sets of the same control information included in a same content as the set of video data, and for transmitting the multiplexed sets of video data and control information.

Abstract: A broadcasting system which includes a broadcasting apparatus and a reception apparatus and which achieves interactiveness using a broadcast wave. The broadcasting apparatus includes a content storing unit for storing the plurality of contents, each content including a set of video data and a set of control information that indicates another content that is a link destination for a present content, and a transmitting unit for multiplexing a set of video data and a plurality of sets of the same control information included in a same content as the set of video data, and for transmitting the multiplexed sets of video data and control information.

Abstract: A terminal apparatus for interactively switching pieces of presentation data in a system which repeatedly broadcasts pieces of presentation data and corresponding pieces of navigation data including a receiver for receiving the presentation data, a reproduction apparatus, and a cache storage for storing pre-received pieces of presentation data and navigation data. Navigation data is analyzed to detect pieces of link-target presentation data which are presented to an operator. When the operator selects one of the link-target presentation data stored in the cache storage, the reproduction apparatus reproduces the presentation data.

Abstract: When a program transmission apparatus divides a program into a plurality of partial programs before transmission, a program reception execution apparatus executes a partial program when the partial program has already been received, and, when the execution needs to proceed to from a present partial program to a next partial program, executes the other partial program when the next partial program has been received.

Abstract: The reception device in two-way digital broadcasting system sends a transmission request for an object via a control channel of a network to a server device that stores a plurality of objects. This plurality of objects includes at least one object that contains data and at least one object that contains a control instruction for a synchronous transmission request requesting the transmission of data that is presently required or an asynchronous transmission request requesting the transmission of data that will probably be necessary in the future. The reception device receives the requested object via the data channel of the network. On receiving an object that includes a control instruction for a synchronous transmission request or an asynchronous transmission request from the server device, the reception device decodes the control instruction in the received object and judges whether a synchronous transmission request or an asynchronous transmission request is to be issued.

Abstract: When a program transmission apparatus divides a program into a plurality of partial programs before transmission, a program reception execution apparatus executes a partial program when the partial program has already been received, and, when the execution needs to proceed to from a present partial program to a next partial program, executes the other partial program when the next partial program has been received.

Abstract: A packet filtering apparatus selectively outputs packets among a plurality of inputted packets. A plurality of conditions are stored, with each condition being specified by a partial data position that indicates a position of a data part of a packet, comparison data to which the data part is to be compared, and a comparison criterion for comparing the data part and comparison data. Different conditions contain different comparison criteria. When filtering packets, a condition in one of the stored conditions is selected, and a data part of an inputted packet is compared with the comparison data of the selected condition according to the comparison criterion in the selected condition. Packets are selectively outputted depending on the result of the comparison.

Abstract: The reception device in two way digital broadcasting system sends a transmission request for an object via a control channel of a network to a server device that stores a plurality of objects. This plurality of objects includes at least one object that contains data and at least one object that contains a control instruction for a synchronous transmission request requesting the transmission of data that is presently required or an asynchronous transmission request requesting the transmission of data that will probably be necessary in the future. The reception device receives the requested object via the data channel of the network. On receiving an object that includes a control instruction for a synchronous transmission request or an asynchronous transmission request from the server device, the reception device decodes the control instruction in the received object and judges whether a synchronous transmission request or an asynchronous transmission request is to be issued.

Abstract: A digital broadcast sending/receiving system includes a digital broadcast sending apparatus and a digital broadcast receiving apparatus. The digital broadcast sending apparatus multiplexes the audio data and video data of a broadcast program into the transport stream together with preselection control information which controls preselection information image facilitating program preselection, and sends the transport stream to the digital broadcast receiving apparatus. On receiving the transport stream, the digital broadcast receiving apparatus extracts the preselection control information, and reproduces a preselection screen on a display in which the preselection information image is superimposed on the video image of the broadcast program. The digital broadcast receiving apparatus receives from the viewer specification of a program to be preselected.

Abstract: A data transmission apparatus has a multiplexing unit that cyclically multiplexes presentation information and navigation information stored in a transmission data storage unit according to control by a multiplexing control unit and a transmission unit that transmits the multiplexed stream. The reception control unit of a data reception apparatus sets filter conditions in a filter condition storage unit of a TS decoder unit in accordance with user operation indications. The presentation information and navigation information separated by the TS decoder unit are outputted via a reproduction unit to a display unit and an audio output unit.

Abstract: A terminal apparatus is provided for displaying an image by reproducing a piece of image information and for interactively changing the image using navigation information. The image is a moving picture, a still picture, or a mixture of them. The image information and the navigation information together are broadcast by a broadcasting station to the terminal apparatus. The navigation information indicates a plurality pieces of link-target image information. The cache unit stores a pair of image information and navigation information. The reproducing unit reproduces the image information. The monitoring unit monitors whether an operator has performed a certain operation responding to the image displayed.

Abstract: A data transmission apparatus has a multiplexing unit that cyclically multiplexes presentation information and navigation information stored in a transmission data storage unit according to control by a multiplexing control unit and a transmission unit that transmits the multiplexed stream. The reception control unit of a data reception apparatus sets filter conditions in a filter condition storage unit of a TS decoder unit in accordance with user operation indications. The presentation information and navigation information separated by the TS decoder unit are outputted via a reproduction unit to a display unit and an audio output unit.