JP2016012844A - Data transmission device, data reception device, and digital broadcasting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and system for transmitting digital broadcast data without waiting for the next retransmission cycle when the digital broadcast data are changed during a current event.SOLUTION: A data transmission device 10 includes: a file data encoding part 13 for performing TS encoding to file data; a PSI/SI generation part 14 for periodically generating an LIT(Local event Information Table); FIFO memories 17 and 18 for storing the file data subjected to TS encoding; a memory 19 for carousel data for storing the generated LIT; and a TS packet multiplexing part 20 for successively reading and multiplexing the data respectively stored in the FIFO memories in a repeated manner, and for reading and multiplexing the LIT stored in the memory for carousel data in a predetermined cycle, and for transmitting a multiplexed stream. The PSI/SI generation part is controlled to, when a change instruction is issued about the LIT being currently transmitted, generate the LIT after change in accordance with the content of the change instruction.

Description

  The present invention relates to a data transmission device, a data reception device, and a digital broadcasting system.

  2. Description of the Related Art Conventionally, in digital broadcasting, an electronic program guide (EPG), which is a program guide, is provided so that a user can easily select a desired program (event) from among many channels. .

  The EPG is expressed based on an event information table (EIT: Event Information Table) tabulated by associating event identifiers, start times, durations, and the like for each event, according to regulations by the Japan Radio Industry Association. . In addition, information on local events (intra-program events), which is a smaller unit of content than an event, is described by a local event information table (LIT: Local event Information Table) (see Patent Document 1).

  Both EIT and LIT are included in SI (Service Information) in digital broadcasting technology. SI is defined by the Japan Radio Industry Association as an extension for PSI (Program Specific Information) defined in the MPEG-2 system (ISO / IEC 13818-1), which is the basic technology of digital broadcasting.

  Specifically, the PSI includes a PAT (Program Association Table) for describing all the organization channels included in the TS (Transport Stream), a video or audio stream superimposed on the TS, and each knitting channel. PMT (Program Map Table) describing the relationship of the above.

  In SI, in addition to EIT and LIT, a service description table (SDT: Service Description Table) for describing information related to a channel, and a broadcaster information table (BIT: Broadcaster Information Table) for describing information related to a broadcasting station. ) Etc. are included. In the digital broadcasting technology, PSI and SI are required to be repeatedly transmitted according to a predetermined retransmission cycle.

  Patent Document 1 describes a program arrangement information description method for avoiding compression of a band necessary for transmission of a program itself. Specifically, in Patent Document 1, when describing program arrangement information including information related to a node or an event, redundant description of information already described in an upper node is omitted in a node or event belonging to the lower node. For example, in a series program, only necessary program information, that is, a description of a higher-level node (for example, a program name) is displayed among information such as a program name, date and time, and the number of broadcasts that need to be described each time. As a result, the data amount of the program arrangement information is suppressed as much as possible without impairing the fullness of the program guide information.

  In addition, a data receiving device and a data sending device capable of displaying details of local events in the EPG and storing and transferring program data are disclosed (see Patent Document 2).

  The data receiving apparatus of Patent Literature 2 creates an EPG using the received EIT. When a remote control operation of “view details of a program” is performed in a state where a predetermined program of EPG is focused, the data receiving device will be described in detail based on the LIT of the focused program As information, the contents of the local event included in the program and the broadcast time are displayed.

Japanese Patent No. 4017289 JP 2001-136495 A

  In digital broadcasting, all SI and PSI including the EIT of the current event and the LIT describing the local event in the current event (hereinafter, at least one of the SI and PSI is referred to as “digital broadcasting data”). , It is obliged to be repeatedly transmitted according to a predetermined retransmission cycle. For recorded programs whose progress has been confirmed, there is no particular problem in that EIT and LIT are repeatedly transmitted.

  However, when the current event is, for example, a live music program, a situation is assumed in which the music (song name) to be played is replaced according to the progress, or an electronic coupon is issued on the spot. Since the LIT can describe the music name, when the music to be played is changed, the music name can be changed immediately by changing the description content of the LIT. However, the LIT is not sent until the next retransmission time even if the description content is immediately changed.

  If the LIT retransmission period is very short, there is no significant effect even if the changed LIT is not sent immediately. However, since the amount of LIT data becomes considerably large, the retransmission cycle of LIT cannot be extremely shortened in consideration of the limited transmission capacity. For this reason, if the changed LIT is not sent until the next retransmission time, for example, although the replaced music is being played, the music name before the replacement is displayed for a certain period of time.

  Also, the LIT retransmission cycle is independent of program switching. For this reason, for example, in an event in which music performance starts with the start of a program, the event and music performance may start before the LIT retransmission time of the event based on periodic retransmission comes. At this time, there is a problem that the song name is not displayed when the music performance starts.

  The techniques described in Patent Documents 1 and 2 avoid the above-mentioned problem because no consideration is given to the case where the LIT is changed during an event or the relationship between program switching and LIT periodic retransmission. I couldn't.

  The present invention has been proposed in view of such circumstances, and when digital broadcast data is changed during the current event, the digital broadcast data can be transmitted without waiting for the next retransmission cycle. It is an object of the present invention to provide a data transmission apparatus that transmits digital broadcast data of an event prior to the start time of the next event, a data reception apparatus that receives the transmitted digital broadcast data, and a digital broadcast system.

  A data transmission apparatus according to the present invention includes TS encoding means for TS encoding stream data to generate TS encoded data, PSI (Program Specific Information) and SI (Service) of a digital broadcasting standard employing an MPEG-2 system. Digital broadcast data generation means for periodically generating digital broadcast data which is at least one of the information), a first FIFO memory for storing the TS encoded data generated by the TS encoding means, Second FIFO memory, data storage means for storing digital broadcast data generated by the digital broadcast data generation means, and data stored in the first and second FIFO memories, respectively, are sequentially read out and multiplexed. And repeat In addition, there is a multiplexed stream sending means for reading out and multiplexing the digital broadcast data stored in the data storage means at a predetermined cycle and sending a multiplexed stream, and a change instruction for the digital broadcast data currently being sent. In this case, the digital broadcast data generation means is controlled to generate the changed digital broadcast data in accordance with the contents of the change instruction, and the changed digital broadcast data is controlled to be written into the second FIFO memory. Control means.

  The data receiving apparatus according to the present invention receives a multiplexed stream, and includes at least one of TS encoded data, PSI (Program Specific Information) and SI (Service Information) of a digital broadcasting standard adopting an MPEG-2 system. Multiplexed stream separating means for separating into digital broadcast data as one data, TS decoding means for decoding TS encoded data separated by the multiplexed stream separating means, and decoded by the TS decoding means L for extracting LIT, which is defined by ARIB STD-B10 and is detailed information of local events related to a predetermined program, from data reproduction means for reproducing data and digital broadcast data separated by the multiplexed stream separation means T extraction means; first storage means for storing the LIT of the currently broadcast program extracted by the LIT extraction means; and first storage means for storing the LIT of the next scheduled broadcast program extracted by the LIT extraction means. And a control means for performing control to switch the LIT stored in the second storage means and the LIT stored in the first storage means before a predetermined time before the program currently being broadcast ends. And data processing means for processing the data decoded by the TS decoding means in accordance with the LIT stored in the first storage means.

  According to the present invention, when the digital broadcast data is changed during the current event, the digital broadcast data can be immediately transmitted without waiting for the next retransmission cycle. Also, the digital broadcast data of the next event can be sent prior to the start time of the next event.

It is a block diagram which shows the structure of the data transmission apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the audio | voice stream multiplexed by the broadcast wave. It is a figure which shows typically the data structure of an event information table. It is a figure which shows typically the data structure of a local event information table. It is a figure which shows typically the data structure of a material information descriptor. It is a figure explaining the event to which the situation which issues an electronic coupon in conjunction with CM2 was added. It is a figure which shows typically the data structure of LIT at the time of considering CM1, CM2 and a music performance as a local event. It is a flowchart which shows TS packet transmission routine. It is a flowchart which shows a LIT transmission routine. It is a time chart which shows the timing of the periodic retransmission of LIT. It is a flowchart which shows a 1st interruption LIT sending routine. It is a time chart which shows the transmission timing of LIT transmitted when the description content of LIT is changed during the broadcast of event 1. It is a flowchart which shows a 2nd interruption LIT sending routine. It is a time chart which shows the condition where LIT [p] of the present event is interrupted and transmitted in the LIT switching transition section in the latter half of the broadcast of event 1. It is a block diagram which shows the structure of the data receiver which concerns on embodiment of this invention. It is a flowchart which shows a LIT processing routine.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a data transmission apparatus 10 according to an embodiment of the present invention.
The data transmission apparatus 10 includes a video encoding unit 11 that encodes video data, an audio encoding unit 12 that encodes audio data, a file data encoding unit 13 that encodes file data, and program feature information (PSI: Program). A PSI / SI generation unit 14 that generates specific information (SI) and service information (SI) is provided. PSI and SI are defined by a digital broadcasting standard that employs the MPEG-2 system.

  Furthermore, the data transmission apparatus 10 includes FIFO (First-In First-Out) memories 15 to 18, a carousel data memory 19, a TS packet multiplexing unit 20 that multiplexes TS packets, and a system control unit that controls the entire system. 21 is provided.

  The FIFO memories 15 to 18 are memories that sequentially output the data according to the order in which the data is input. For this reason, no data remains in the FIFO memories 15 to 18 after the data reading is completed.

  The video encoding unit 11 compresses and encodes video data such as a video stream supplied from the outside to generate a video TS packet having a fixed length of 188 bytes. The video encoding unit 11 sequentially stores the generated video TS packets in the FIFO memory 15.

  The audio encoding unit 12 compresses and encodes audio data such as an audio stream supplied from the outside to generate an audio TS packet, and sequentially stores the generated audio TS packet in the FIFO memory 16.

  The file data encoding unit 13 is supplied with a still image material constituting a screen, a BML or HTML document describing a display position, a display method, and the like as a file from the outside (for example, a host system).

  The file data encoding unit 13 encodes file data supplied from outside into a format suitable for IPDC (IP data cast) to generate a file TS packet, and sequentially stores the generated file TS packet in the FIFO memory 17. To do. The file TS packet is multiplexed and then distributed as a broadcast wave as IPDC.

  Note that the file TS packet may be repeatedly transmitted as necessary, unlike video and audio. In this case, the host system of the data transmission device 10 repeatedly supplies predetermined file data to the data transmission device 10 so that the file data is repeatedly transmitted.

  The PSI / SI generation unit 14 includes an SI including an event information table (EIT: Event Information Table) and a local event information table (LIT: Local event Information Table), and a multiplexed video / audio stream within the data transmission device 10. A PSI describing the relationship between the program and the actual program is generated and output.

  Note that EIT and LIT are defined by ARIB STD-B10. In addition, when SI and PSI are supplied from the outside, the PSI / SI generation unit 14 may output the supplied SI and PSI instead of generating SI and PSI.

  Then, the PSI / SI generation unit 14 stores the above-described SI and PSI in the carousel data memory 19 as carousel data that is periodically retransmitted. Note that the PSI / SI generation unit 14 stores the SI and PSI in the FIFO memory 18 when there is an interrupt instruction from the system control unit 21.

  The TS packet multiplexing unit 20 repeatedly reads and multiplexes TS packets stored in the FIFO memories 15 to 18 and reads out data stored in the carousel data memory 19 at predetermined intervals. Multiplex. Here, since the carousel data memory 19 is not a FIFO memory but a normal memory, the SI and the PSI stored in the carousel data memory 19 are the same unless they are overwritten. Therefore, the TS packet multiplexing unit 20 reads and multiplexes the same data at a predetermined cycle.

  Then, the TS packet multiplexing unit 20 transmits the multiplexed TS packet as a broadcast wave that is a multiplexed TS. The system control unit 21 executes a TS packet transmission routine and first and second LIT transmission routines, which will be described later, in order to appropriately control each unit of the data transmission apparatus 10.

  The data transmission device 10 having such a configuration is compatible with, for example, ISDB digital broadcasting, and transmits an electronic program guide (EPG) corresponding to a program guide superimposed on a broadcast wave.

  The EPG is an EIT that describes the start time, duration, program title, program overview, etc. for each broadcast program (event), and for each local event (in-program event) that is a smaller unit of content than the event. And LIT that describes the start time, duration, and other detailed information.

  FIG. 2 is a diagram illustrating an example of an audio stream multiplexed on a broadcast wave. This audio stream indicates one event (for example, a music program).

  In this event, an opening talk starts at a predetermined program start time, and there is a music introduction talk across CM1. After that, there is a music performance, and there is a closing talk at the end with CM2 immediately after the end, and the program ends at a predetermined program end time. The local event refers to a partial structure in the event such as CM1, CM2, and music performance.

  The EIT of the event describes the start time, duration, program title, program summary, etc. of the event. Furthermore, the LIT referring to the EIT includes the start time and duration of each local event (CM1, CM2, and music performance) that constitutes the event, and various information related to the “material” that constitutes the local event. Described.

FIG. 3 is a diagram schematically showing the data structure of EIT.
The EIT has an EIT header, EIT basic information, and event description data. The EIT basic information includes a service ID for identifying a channel (service) that broadcasts the event, a version number of the EIT, an identifier of a transport stream (TS) including the channel, and the like.

The event description data is data that is repeatedly described for each event, and includes event basic information, a single event descriptor, and an extended event descriptor.
The basic event information includes an event ID for identifying the event, a start time and a duration of the event, and the like. For example, the description of the program title corresponds to the single event descriptor. The extended format event descriptor corresponds to, for example, a description of a program summary.

  Note that the single format event descriptor and the extended format event descriptor shown in FIG. 3 are examples, and can be changed to other descriptors according to the event. The EIT usually includes one or more event description data. However, an independent EIT having only the event description data is generated for each of the currently aired event (current event), which is the most important event, and the event scheduled to be aired immediately thereafter (next event).

  FIG. 4 is a diagram schematically showing the data structure of the local event information table (LIT). The LIT is configured in substantially the same manner as the EIT, and has a LIT header, LIT basic information, and local event description data.

  Like the EIT basic information, the LIT basic information includes a service ID for identifying a channel (service) that broadcasts the event, a version number of the LIT, an identifier of a transport stream (TS) including the channel, and the like. The LIT basic information further corresponds to an event ID that is an identifier of an event that is a reference target of the LIT.

The local event description data is data described for each local event. The local event basic information and one or more descriptors (basic local event descriptor, material information descriptor, etc.) describing various information related to the local event. ).
Note that the local event basic information is substantially only a local event ID for identifying a local event, unlike the event basic information in the EIT.

The basic local event descriptor describes the start time and duration of a local event. When the basic local event descriptor is omitted, the local event start time and duration are interpreted as the same as the EIT start time and duration referenced by the LIT describing the local event. Therefore, a local event in which the basic local event descriptor is omitted starts at the same time as the event to which it is referenced and ends at the same time as the event.

  The material information descriptor collectively describes various pieces of information related to “materials” constituting the local event. When the local event is composed of a plurality of materials, a material information descriptor is provided for each material. In principle, the material information descriptor is bound to the start time and duration of the basic local event descriptor.

FIG. 5 is a diagram schematically showing the data structure of the material information descriptor.
The material information descriptor includes a material information descriptor header, a material type, a material name, a material code, a material period, and a material link. The material type is the media type of the material to be described by the material information descriptor, and corresponds to, for example, a still image and audio. The material name is a readable text given as the name of the material.

  The material code is an identifier for uniquely identifying the material from an external application. The material period is an effective period of the material. The material period is handled with priority over the duration of the basic local event descriptor, and can be set to an arbitrary time. For this reason, the material period is described when it is desired to change the effective period of only a part of the material in the local event.

  The material link is a reference link to a related material or related information of the material, for example, a storage location of the material. When the material link is used to specify the storage location of the material, for example, a data receiving device that has received material data (material data) distributed by broadcast waves as IPDC stores the material data specified by the material link. Store in place. Then, the data receiving device reads the material data from the storage location and presents it based on the material link, for example, in accordance with the start time of the local event.

  In the LIT, corresponding local event description data is generated for each local event. And each local event description data is arrange | positioned according to the order of the local event with the early start time. For this reason, the local event description data of the local event that occurs simultaneously with the start of the event is arranged at the head in the LIT. The local event description data of the local event that occurs at the end of the event is arranged at the end in the LIT.

  The LIT, like the EIT, can contain one or more local event description data. All local events included in one event are described by one LIT. On the other hand, in the case of EIT, each EIT of the current event and the next event exists independently, and this point is different.

  Note that the LIT is always the same regardless of the progress of the event to be referenced unless the description content is changed, for example, when a new local event is added during the progress of the event. In other words, whether the LIT that refers to an event is sent to the outside immediately after the start of the event or sent to the outside just before the end of the event, It is the same unless changed.

Here, the local event information table and the material information descriptor will be described with specific examples.
FIG. 6 is a diagram illustrating an event in which a situation in which an electronic coupon is issued in conjunction with “CM2” is added to the event illustrated in FIG. FIG. 7 is a diagram schematically showing the data structure of LIT (and material information descriptor) when CM1, CM2 and music performance are regarded as local events.

As shown in FIG. 7, the LIT has an event ID, and refers to the LIT having the same event ID as the event ID.
The LIT is related to the EIT that is a reference target and indicates detailed information of the event described by the EIT. For this reason, the event ID of the LIT basic information in the LIT matches the event ID of any existing EIT. That is, the LIT is invalid when there is no reference target EIT, and the LIT is excluded from the processing target of the data receiving apparatus.

  The LIT describes all local events in the associated event, and lists each local event description data according to the start time. In FIG. 7, local event description data is listed in the order of local event description loop 0 (loop 0), loop 1 (loop 1), and loop 2 (loop 2), and each local event starts in that order.

  In the first loop 0, the start time and duration of “CM1” in FIG. 6 are t1 and d1, respectively, the material type is “voice”, the material name is “CM1”, and the material The code (for example, corresponding to a 10-digit CM code issued by the common code management center) is “cm0101”. The identifier (local event ID) of this local event is “LE1”.

  In Loop 1, the start time and duration of “music performance” in FIG. 6 are t2 and d2, respectively, the material type is “music”, and the material name is “Let's dance!” Furthermore, the material code (in this case, corresponding to a license code such as IEC62227) is “music1234”. The identifier of this local event is “LE2”. Here, the material name corresponds to the music title (music name). When received by the data receiving device, the material name is displayed at a predetermined location on the screen as the song title being played.

  In loop 2, the start time and duration of “CM2” in FIG. 6 are t3 and d3, respectively, the material type is “voice”, the material name is “CM2”, and the material code is “Cm2323” is shown. The identifier of this local event is “LE3”.

  Furthermore, in the loop 2, an electronic coupon sent in conjunction with the start of “CM2” is also described as one of the materials constituting the local event.

  Specifically, the lower loop 1 of the material information descriptor generated in the loop 2 has the material type “(electronic) coupon”, the material period “d4”, and the material link “http”. : /.../ icon.jpg ". Note that the material link indicates the acquisition location (storage location) of the still image when the electronic coupon is displayed as an icon on the screen.

  The default duration of the local event “CM2” is d3 described in the basic local event descriptor of the local event description data. On the other hand, the electronic coupon continues even after the end of the local event “CM2”, and its duration is d4. That is, the electronic coupon is displayed on the data receiving device as an icon still image at the start time t3 when CM2 starts, and the display is continued only for the duration d4. Therefore, the material period d4 of the lower loop 1 indicating the electronic coupon has priority over the duration d3 of the basic local event descriptor.

  FIG. 8 is a flowchart showing a TS packet transmission routine. For example, when receiving a request for sending a multiplexed transport stream (multiplexed TS) from the host system, the system control unit 21 starts the process of step S1 of the TS packet sending routine shown in FIG.

In step S1, the system control unit 21 resets the transmission TS packet counter and proceeds to step S2.
In step S2, the system control unit 21 selects the FIFO memory 15 as an initial confirmation operation, and proceeds to step S3. The system control unit 21 repeatedly selects the FIFO memories 15 to 18 sequentially when TS packets are multiplexed and transmitted, and the FIFO memory 15 is selected first.

  In step S3, the system control unit 21 determines whether there is a TS packet in the selected FIFO memory. If there is a TS packet, the system control unit 21 proceeds to step S4. If there is no TS packet, the system control unit 21 proceeds to step S6.

  In step S4, the system control unit 21 reads the TS packet from the selected FIFO memory, supplies the TS packet to the TS packet multiplexing unit 20, and proceeds to step S5. As a result, the TS packet multiplexing unit 20 multiplexes and transmits the TS packet of the selected FIFO memory.

In step S5, the system control unit 21 increases the count number of the transmission TS packet counter by 1, and proceeds to step S6.
In step S6, the system control unit 21 determines whether all the FIFO memories 15-18 have confirmed the presence / absence of TS packets. If all the FIFO memories 15-18 have confirmed the presence / absence of TS packets, step S8 is performed. If not confirmed, the process proceeds to step S7.

  In step S7, the system control unit 21 selects the next FIFO memory and returns to step S3. As described above, the system control unit 21 repeatedly executes Steps S3 to S7 to confirm the presence or absence of TS packets in all the FIFO memories 15 to 18, and then proceeds to Step S8.

  In step S8, the system control unit 21 determines whether a predetermined number of TS packets have been transmitted, that is, whether the transmission TS packet counter has reached a predetermined number. When the transmission TS packet counter reaches a predetermined number, the system control unit 21 has already transmitted a predetermined number of TS packets, and thus proceeds to step S9. On the other hand, if the transmission TS packet counter has not reached the predetermined number, the system control unit 21 returns to step S2 because the predetermined number of TS packets have not been transmitted.

  In step S9, the system control unit 21 reads the TS packet from the carousel data memory 19, supplies the TS packet to the TS packet multiplexing unit 20, and proceeds to step S10. As a result, the TS packet multiplexing unit 20 multiplexes the TS packets in the carousel data memory 19 and sends them out.

  Here, the carousel data memory 19 is not a FIFO memory but a normal memory. That is, the TS packet stored in the carousel data memory 19 does not change until it is overwritten. As a result, the same TS packet is repeatedly transmitted. In other words, if the TS packet stored in the memory is overwritten and changed, PSI / SI having different description contents is transmitted from the next transmission timing.

Thereafter, the system control unit 21 resets the transmission TS packet counter in step S10 and returns to step S2 to select the initial initial confirmation FIFO memory, thereby repeating a series of operations until a multiplexed transmission end instruction is issued. Run.

  In the present embodiment, for example, one carousel data memory 19 and one transmission TS packet counter are shown so that EIT and LIT are collectively retransmitted. However, the PSI / SI generator 14 actually includes a plurality of carousel data memories and transmission TS packet counters corresponding to each period retransmission in order to generate a plurality of digital broadcast data having different retransmission periods.

  Furthermore, in this embodiment, periodic retransmission is performed based on the transmission of a predetermined number of TS packets using a transmission TS packet counter. However, as another embodiment, the system control unit 21 is provided with a periodic timer so that a carousel is provided. The system control unit 21 may control the TS packet multiplexing unit 20 so as to periodically read TS packets from the data memory 19.

  FIG. 9 is a flowchart showing a LIT transmission routine. The system control unit 21 starts execution of the above-described TS packet transmission routine, and at the same time, starts the processing of S21 of the LIT transmission routine shown in FIG.

  In step S21, the system control unit 21 controls the PSI / SI generation unit 14 to generate the LIT of the current event, and proceeds to step S22.

  In step S22, the system control unit 21 writes the LIT generated by the PSI / SI generation unit 14 in the carousel data memory 19, and proceeds to step S23. As a result, the LIT is read from the carousel data memory 19 at every predetermined retransmission cycle by the TS packet transmission routine shown in FIG. 8, multiplexed in the TS, and then transmitted to the outside.

In step S23, the system control unit 21 determines whether the current time is in the LIT switching transition section.
Here, when the current event is being broadcasted, the LIT of the current event is basically generated and transmitted. However, the LIT of the next event is generated and transmitted in the time interval from a predetermined time before the end time of the current event to the end time even if the current event is being broadcast. This time interval is a time interval in which the LIT switches from the current event to the next event, and this is referred to as a LIT switching transition interval.

  Therefore, the system control unit 21 proceeds to step S24 if it is determined that the current time is in the LIT switching transition section, and waits in step S23 if it is determined that the current time is not in the LIT switching transition section. As a result, the LIT is sent out every retransmission cycle, and when the current time enters the LIT switching transition section, the process proceeds to step S24.

  In step S24, the system control unit 21 determines whether or not to send the LIT of the next event for the first time within the current LIT switching transition section, and proceeds to step S25 if it is the first transmission, and if not the first transmission, step S24 is performed. Return to S23.

In step S25, the system control unit 21 controls the PSI / SI generation unit 14 to generate the LIT of the next event, and proceeds to step S26.
In step S26, the system control unit 21 overwrites the carousel data memory 19 with the LIT of the next event generated by the PSI / SI generation unit 14, and proceeds to step S27.

  In step S27, the system control unit 21 determines whether the transmission of the multiplexed TS has been completed. If it has not been completed, the system control unit 21 returns to step S23, and if it has been completed, this routine is terminated.

FIG. 10 is a time chart showing the timing of LIT periodic retransmission.
LIT is used, for example, to display the name of a song being played. In addition, the LIT with the current event as a reference target is normally transmitted for each retransmission period in a period from the start to the end of the current event.

  However, for example, when the music performance is started immediately after the start of the next event, there is no guarantee that the data receiving device has received the LIT that refers to the event at the start time of the event.

  Even if the data receiving apparatus can receive the LIT near the start time of the music performance, it takes time for the data processing to display the music name on the screen, and there is a time lag until the music name is displayed on the screen. Occur. Therefore, there is a possibility that the data receiving apparatus cannot display the music title of the performance music even though the performance of the music has already started.

  In FIG. 10, LIT [p] and LIT [f] are LITs that refer to the current event and the next event, respectively. The LIT is transmitted according to a predetermined retransmission cycle regardless of the description content. Furthermore, LIT [f] with the next event (event 2) as a reference target is sent prior to the start time of the next event.

  Here, a time interval in which the next event LIT [f] is transmitted in advance is referred to as a LIT switching transition interval. The time length of the LIT switching transition section is specified separately as a transmission control parameter together with the LIT retransmission cycle.

  As described above, LIT [f] with the next event as a reference target is transmitted in advance even during the broadcast of the current event. As a result, the receiver can receive the LIT of the next event prior to the start of the next event, and can perform predetermined data processing even immediately after the start of the next event.

  As a result, for example, when the music performance starts immediately after the start of the next event, the data receiving apparatus reliably receives the LIT that refers to the event at the start time of the event, and a time lag occurs. The music title can be displayed.

  FIG. 11 is a flowchart showing a first interrupt LIT transmission routine. If there is a possibility that the system control unit 21 immediately transmits the LIT reflecting the change of the local event and continues the LIT transmission even in the subsequent periodic retransmission, the system control unit 21 performs the process of step S31 of the first interrupt LIT transmission routine. Start.

  In step S31, the system control unit 21 controls the PSI / SI generation unit 14 so as to generate an initial LIT of the current event, and proceeds to step S32.

  In step S32, the system control unit 21 writes the LIT generated by the PSI / SI generation unit 14 in the carousel data memory 19, and proceeds to step S33. As a result, the LIT is read from the carousel data memory 19 at every predetermined retransmission cycle by the TS packet transmission routine shown in FIG. 8, multiplexed in the TS, and then transmitted to the outside.

  Here, during the current event (for example, a music program), if a song to be played in the future is replaced or a new electronic coupon is issued, the description content of the LIT is changed, and further, the LIT basic information in the LIT basic information is changed. The version number is also updated.

  In step S33, the system control unit 21 determines whether there is an instruction to change the description content of the LIT. For example, if there is an instruction to add or change the local event in the current event from the user or the host system, the system control unit 21 determines that there is an instruction to change the description content of the LIT, and proceeds to step S34. On the other hand, if there is no instruction to add or change a local event in the current event, the system control unit 21 determines that there is no instruction to change the description content of the LIT, and waits for step S33.

  In step S34, the system control unit 21 controls the PSI / SI generation unit 14 to generate a new LIT of the current event in accordance with the instruction to change the description content of the LIT, and proceeds to step S35.

  For example, when there is an instruction to add “music performance” shown in FIG. 6 as a local event, the PSI / SI generating unit 14 executes loop 1 (local event description data with local event ID = “LE2”) shown in FIG. A newly added LIT is generated. In this case, the start time t2 of the basic local event descriptor is set to a desired time at which “music performance” starts. However, when there is an additional instruction to immediately insert the “music performance”, the start time t2 of the basic local event descriptor is the creation time of the LIT.

  Further, when there is an instruction to add the “electronic coupon” shown in FIG. 6 as a local event, the PSI / SI generating unit 14 performs loop 2 (local event description data with local event ID = “LE3”) shown in FIG. A LIT in which the lower loop 1 is newly added to the material information descriptor is generated.

  Although this electronic coupon is a material of the local event “CM2”, there are cases where it is desired to display the electronic coupon when the CM2 broadcast starts and to display it for a certain period of time after the CM2 broadcast. In this case, the material period d4 (> d3) is described in the material information descriptor of the lower loop 1 as shown in FIG. The material period d4 is prioritized over the CM2 broadcast time (duration d3). For this reason, the electronic coupon can be displayed even after the broadcast of CM2 is completed.

  In step S <b> 35, the system control unit 21 determines whether there is an immediate transmission request for the LIT whose description content has been changed, specifically, for example, whether an immediate transmission request operation has been performed by the user.

  For example, even if an electronic coupon is issued or a performance music piece is replaced, the data receiving device cannot reflect these contents until it receives a LIT that is periodically retransmitted. Therefore, for example, when the user wants to immediately reflect the LIT of the changed description content to the receiver, the user can perform an operation for requesting immediate transmission of the LIT.

  The system control unit 21 proceeds to step S36 when an immediate transmission request operation is performed by the user, and proceeds to step S37 when an immediate transmission request operation is not performed by the user.

  In step S36, the system control unit 21 writes the changed LIT generated by the PSI / SI generation unit 14 in the FIFO memory 18, and proceeds to step S37. Thereby, the TS packet multiplexing unit 20 reads the LIT from the FIFO memory 18 and immediately multiplexes it, thereby performing LIT interrupt transmission processing and transmitting the multiplexed TS.

  In step S37, the system control unit 21 overwrites the carousel data memory 19 with the changed LIT generated by the PSI / SI generation unit 14, and proceeds to step S38. As a result, the TS packet multiplexing unit 20 reads the LIT overwritten in the carousel data memory 19 and transmits it as a multiplexed TS at every predetermined retransmission period. In other words, the same LIT sent in the interrupt process is continuously sent out even in periodic retransmission.

  In step S38, the system control unit 21 determines whether or not the transmission of the multiplexed TS has ended. If it has not ended, the system control unit 21 returns to step S33, and if it has ended, this routine ends.

FIG. 12 is a time chart showing the transmission timing of the LIT that is transmitted when the description content of the LIT is changed during the event 1 broadcast.
In FIG. 12, LIT1 [p], which is the LIT of the current event, is periodically transmitted according to a retransmission cycle specified in advance.

  When, for example, a new electronic coupon is issued in the middle of event 1, the LIT to be sent is updated from LIT1 [p] to LIT2 [p]. At this time, the LIT2 [p] is normally sent at the next retransmission timing.

  However, this time lag becomes a problem when it is desired to immediately reflect the change in the description content of the LIT to the data receiving apparatus, such as when an electronic coupon is issued immediately. Therefore, when the description content of the LIT is updated to LIT2 [p], the LIT is promptly interrupted and transmitted at a timing independent of the LIT retransmission cycle. Then, the same LIT2 [p] sent in the interrupt process is continuously sent out in subsequent periodic retransmissions.

  FIG. 13 is a flowchart showing a second interrupt LIT transmission routine. If there is a possibility that the system control unit 21 immediately sends out the LIT reflecting the change in the local event, the system control unit 21 starts the process of step S41 of the second interrupt LIT sending routine.

  In step S41, the system control unit 21 controls the PSI / SI generation unit 14 so as to generate an initial LIT of the current event, and proceeds to step S42.

  In step S42, the system control unit 21 writes the LIT generated by the PSI / SI generation unit 14 in the carousel data memory 19, and proceeds to step S43. As a result, the LIT is read from the carousel data memory 19 at every predetermined retransmission cycle by the TS packet transmission routine shown in FIG. 8, multiplexed in the TS, and then transmitted to the outside.

  In step S <b> 43, the system control unit 21 determines whether there is a change in a local event that is a target of interrupt transmission. Here, for example, the system control unit 21 determines whether there is a change in the local event of the current event in a situation where the LIT of the next event is periodically retransmitted in the LIT switching transition section. If there is no change in the local event of the current event, the system control unit 21 determines that there is no change in the local event to be interrupted and waits for step S43. If there is a change in the local event of the current event, the system control unit 21 determines that there is a local event to be interrupted and proceeds to step S44.

In step S44, the system control unit 21 controls the PSI / SI generation unit 14 to generate a new LIT of the current event, for example, according to the change contents of the local event, and proceeds to step S45.

  In step S45, the system control unit 21 writes the interrupt transmission target LIT generated by the PSI / SI generation unit 14 in the FIFO memory 18, and proceeds to step S46. As a result, the TS packet multiplexing unit 20 reads the LIT from the FIFO memory 18 and immediately multiplexes it, thereby performing the LIT interrupt transmission process and transmitting the multiplexed TS.

  In step S46, the system control unit 21 determines whether or not the transmission of the multiplexed TS has ended. If it has not ended, the system control unit 21 returns to step S43, and if it has ended, this routine ends.

  FIG. 14 shows the LIT [p] that is the LIT of the current event in the situation where the LIT [f] that is the LIT of the event 2 that is the next event is periodically retransmitted in the LIT switching transition section in the latter half of the event 1 broadcast ] Is a time chart showing a situation of interrupt transmission.

  In the LIT switching transition section, LIT [p] with the current event as a reference target is not transmitted. For this reason, the data receiving apparatus cannot receive LIT [p] within the LIT switching transition section. Therefore, for example, even if a new electronic coupon is issued as a local event of event 1 and the description content of LIT [p] is changed in the LIT switching transition section, the changed LIT [p] Not sent to the device.

  Therefore, in the LIT switching transition section, when it is desired to reflect the changed LIT with the current event as a reference target to the receiver, the LIT interrupt is transmitted. Note that the number of occurrences of LIT [p] interrupt transmission in the LIT switching transition section is not limited to one, but may be multiple.

For example, when a new electronic coupon is issued, LIT [p] interrupt transmission may be performed once. However, even when the data receiving apparatus starts data reception in the LIT switching transition section, it is desirable that the description contents of the LIT with reference to the current event can be reflected promptly. In this case, the number of occurrences of the LIT [p] interrupt transmission after the change is required a plurality of times. The specific number of interrupt transmissions may be an optimum number in consideration of the allowable transmission capacity and the time length of the LIT switching transition section.

  FIG. 15 is a block diagram showing a configuration of the data receiving apparatus 30 according to the embodiment of the present invention. The data receiving device 30 receives the multiplexed TS sent from the data transmitting device 10 shown in FIG. 1, and displays video / audio / image / characters.

  The data reception device 30 includes a TS packet separation unit 31 that separates various TS packets from the multiplexed TS, an audio decoding unit 32 that decodes audio TS packets, an audio reproduction unit 33 that reproduces audio, and a speaker that outputs audio. 34, a video decoding unit 35 for decoding video TS packets, and a video reproduction unit 36 for generating video.

  Further, the data transmission device 10 includes a file data decoding unit 37 that decodes a file TS packet, a PSI / SI interpretation unit 38 that interprets a PSI / SI • TS packet, a data processing unit 39 that performs data processing, A display combining unit 40 that combines images and characters and a display unit 41 that displays the combined result are provided.

  The TS packet separator 31 receives the multiplexed TS sent from the data sending device 10 and separates it into a video TS packet, an audio TS packet, a file TS packet, and a PSI / SI / TS packet.

  The voice decoding unit 32 decodes the voice TS packet separated by the TS packet separation unit 31 into the original voice data. The sound reproducing unit 33 performs sound data reproduction processing and outputs sound through the speaker 34.

  The video decoding unit 35 decodes the video TS packet separated by the TS packet separation unit 31 into the original video data. The video playback unit 36 performs video data playback processing.

  The file data decoding unit 37 decodes the file TS packet separated by the TS packet separation unit 31 into the original file data. The decrypted file data corresponds to, for example, a file such as a BML (Broadcast Markup Language) or HTML (HyperText Markup Language) document that describes a still image material constituting the screen, a display position, a display method, and the like.

The PSI / SI interpretation unit 38 interprets the PSI / SI · TS packet separated by the TS packet separation unit 31 and extracts EIT, LIT, and the like. The PSI / SI interpretation unit 38 includes a LIT interpretation unit 38a that interprets the extracted LIT.

  The data processing unit 39 interprets an HTML document, for example, and renders a still image material as a resource according to the interpretation result. In addition, the data processing unit 39 performs rendering processing together with the above-described resources based on EIT and LIT, and generates display data of an electronic coupon, for example.

  In addition, the data processing unit 39 includes first and second LIT holding memories M1, M2, and a LIT processing unit 39a that performs LIT processing. The display synthesis unit 40 synthesizes the video reproduced by the video reproduction unit 36 and the display data obtained by the data processing unit 39 and displays the video via the display unit 41.

In the data receiving device 30 configured as described above, the following LIT processing routine is executed.
FIG. 16 is a flowchart showing the LIT processing routine.

  In step S51, the LIT interpreter 38a receives the LIT from the TS packet separator 31 and proceeds to step S52.

  In step S52, the LIT interpretation unit 38a determines whether the received LIT is the LIT of the current event. Here, it is determined whether the event ID of the LIT basic information in the LIT matches the event ID of the EIT describing the current event.

  If they match, the received LIT is that of the current event (LIT [p]), and the process proceeds to step S53. If they do not match, the received LIT is not the current event (LIT [p]), and the process proceeds to step S56.

  In step S53, the LIT interpretation unit 38a determines whether the received LIT has been received for the first time after the activation of the LIT processing routine, or whether the description content has been updated. Whether the LIT has been received for the first time or not is determined by the LIT interpreter 38a based on the presence or absence of past LIT reception. In addition, the LIT interpretation unit 38a determines whether the LIT has been updated based on the version number of the LIT basic information of the received LIT.

  If the LIT has been received for the first time or the description content has been updated, the process proceeds to step S54, and if not, the process returns to step S51.

  In step S54, the LIT interpretation unit 38a determines whether the LIT of the received current event should be continuously processed. Here, the LIT interpretation unit 38a determines whether the first and second LIT holding memories M1 and M2 have not been swapped. If it is before the swap process, the process goes to step S55 since the LIT should be processed, and if it is after the swap process, the process goes back to step S51 because the LIT should not be processed.

  In step S55, the LIT interpretation unit 38a overwrites the first LIT holding memory M1 with the LIT, and proceeds to step S61.

  In step S56, the LIT interpretation unit 38a determines whether the LIT received in step S51 is the LIT of the next event. Such a determination is made because the LIT of the next event is received in the LIT switching transition section even during the current event.

  Here, it is determined whether the event ID of the LIT basic information in the LIT matches the event ID of the EIT describing the next event. If they match, the received LIT is that of the next event (LIT [f]), and the process proceeds to step S57. If they do not match, the received LIT is not for the next event (LIT [f]), and the process returns to step S51.

  In step S57, as in step S53, the LIT interpreter 38a determines whether the received LIT has been received for the first time after the start of the LIT processing routine or the description content has been updated. If the LIT has been received for the first time or the description content has been updated, the process proceeds to step S58, and if not, the process returns to step S51.

  In step S58, the LIT interpreter 38a overwrites the received LIT on the second LIT holding memory M2, and proceeds to step S59.

  In step S59, the LIT interpretation unit 38a determines whether the current event ends within a predetermined time from the current time.

  By the way, the purpose of preceding transmission of LIT [f] in the LIT switching transition section is to enable the data receiving apparatus 30 to process LIT [f] in advance before the start of the next event. Thereby, for example, a music title played immediately after the start of the next event is displayed without delay.

  On the other hand, the data receiving apparatus 30 also needs to pre-process LIT [f] received in advance before starting the next event. Therefore, in order to confirm the progress of the current event, the LIT interpretation unit 38a determines whether or not the current event ends within a predetermined time. If the process ends within the predetermined time, the process proceeds to step S60, and otherwise, the process returns to step S51.

  In step S60, the LIT interpretation unit 38a exchanges (swaps) the data stored in the first and second LIT holding memories M1 and M2, and proceeds to step S61. As a result, the LIT of the next event stored in the second LIT holding memory M2 is stored in the first LIT holding memory M1 and becomes a target of processing by the LIT processing unit 39a.

  When the data transmitting apparatus 10 enters the LIT switching transition section and starts periodic retransmission of LIT [f], the subsequent LIT [p] is transmitted as an interrupt LIT as shown in FIG.

  On the other hand, the data reception device 30 processes the received LIT [p] as usual unless the memory data is swapped based on the determination in step S59. That is, the data receiving device 30 performs the process of LIT [p] independently of the data transmitting device 10 without being conscious of the LIT switching transition section of the data transmitting device 10.

  In step S61, the LIT processing unit 39a of the data processing unit 39 performs LIT processing using the LIT stored in the first LIT holding memory M1, and proceeds to step S62.

  Further, the LIT processing unit 39a presents the local event output process in the time zone indicated by the basic local event descriptor (start time and duration) of the local event. As described above, when the basic local event descriptor is omitted, the start time and the duration are interpreted to be the same as those of the EIT to which it refers.

On the other hand, when there is a material period in the material information descriptors of some materials constituting the basic local event, the LIT processing unit 39a determines the material period of the material information descriptor rather than the duration of the basic local event descriptor. Is treated with priority.

  For example, as shown in FIG. 7, in the local event “CM2”, the basic local event descriptor has a start time t3 and a duration d3. That is, CM2 is presented between the start time t3 and the duration d3. However, the material period of the CM2 coupon (lower loop 1) is d4. For this reason, as shown in FIG. 6, the voice of CM2 (lower loop 0) is output during the duration d3 from the start time t3, but the coupon of CM2 is output during the material period d4 from the start time t3. Is output.

  In step S62, the PSI / SI interpretation unit 38 determines whether or not the reception of the multiplexed TS is finished. If the reception is not finished, the process returns to step S51, and if the reception is finished, this routine is finished.

  As described above, when receiving the LIT of the current event, the data receiving apparatus 30 processes the LIT of the current event in real time by executing steps S52 to S55 and S61. Further, when receiving the LIT of the next event, the data receiving device 30 processes the LIT of the next event immediately before the end of the current event by executing steps S56 to S61.

  For this reason, the data reception device 30 securely holds the LIT of the next event received before the start of the next event, and performs the preceding process of the LIT of the next event immediately before the end of the current event, thereby starting the next event. At the same time, a material output process based on the LIT can be performed.

  Further, the data receiving device 30 has received the LIT including the basic local event descriptor indicating the broadcast time zone of the local event and the material period indicating the valid period of the material (for example, electronic coupon) constituting the local event. In some cases, the material period is given priority over the local event broadcast time zone. Thereby, the data receiving device 30 can output the material of the local event for a desired time without being affected by the presence or absence of the end of the local event.

  In addition, this invention is not limited to embodiment mentioned above, It applies also to what was design-changed within the range of the matter described in the claim.

  For example, in the above-described embodiment, the LIT interrupt transmission / reception has been described as an example, but the present invention is not limited to the LIT interrupt transmission / reception. The present invention can also be applied to interrupt transmission / reception of PSI and SI, which are digital broadcast-related information transmitted periodically, as in LIT.

  For example, in the event that the duration cannot be specified in advance (for example, a sports broadcast program), the EIT of the event is “undecided” for the duration of the basic event information shown in FIG. Is set. Then, at the end of the event and when the relay end time of the event is determined, the duration of the event basic information shown in FIG. 3 is changed to a predetermined value.

  EIT is periodically retransmitted in the same manner as LIT. For this reason, if the retransmission cycle is long, there is a problem that it takes time until the changed EIT is reflected. In some cases, the changed EIT may be reflected in the data receiving device as soon as possible.

  Therefore, the data transmitting apparatus 10 sends out an EIT in the same manner as the LIT. Specifically, the system control unit 21 shown in FIG. 1 determines that there is a request for immediate transmission of the EIT when the duration of the EIT is changed to a predetermined value, and changes to the PSI / SI generation unit 14. It is only necessary to generate a later EIT and write the EIT into the FIFO memory 18. As a result, the EIT whose duration of the basic event information has been changed is immediately interrupted and transmitted to the data receiving apparatus.

  Further, the data transmitting apparatus 10 can also immediately send out an interrupt for a PAT (Program Association Table) which is a kind of PSI, similarly to the LIT.

  PAT describes all the organized channels of the multiplexed TS. For example, when a new organization channel is temporarily added and it is desired to make it a channel selection target of the data receiving apparatus, it is necessary to change the description contents of the PAT. In this case, the system control unit 21 illustrated in FIG. 1 may cause the PSI / SI generation unit 14 to generate the changed PAT and write the PAT into the FIFO memory 18.

DESCRIPTION OF SYMBOLS 10 Data transmitter 11 Video encoder 12 Audio encoder 13 File data encoder 14 PSI / SI generator 15-18 FIFO memory 19 Carousel data memory 20 TS packet multiplexer 21 System controller 30 Data receiver 31 TS packet separation unit 32 Audio decoding unit 33 Audio reproduction unit 34 Speaker 35 Video decoding unit 36 Video reproduction unit 37 File data decoding unit 38 PSI / SI interpretation unit 38a LIT interpretation unit 39 Data processing unit 39a LIT processing unit 40 Display synthesis unit 41 Display unit M1 First LIT storage memory M2 Second LIT storage memory

Claims (10)

TS encoding means for TS encoding the stream data to generate TS encoded data;
Digital broadcast data generating means for periodically generating digital broadcast data, which is at least one of PSI (Program Specific Information) and SI (Service Information) of the digital broadcast standard adopting the MPEG-2 system;
A first FIFO memory for storing TS encoded data generated by the TS encoding means;
A second FIFO memory;
Data storage means for storing the digital broadcast data generated by the digital broadcast data generation means;
The data stored in the first and second FIFO memories are sequentially read out and multiplexed repeatedly, and the digital broadcast data stored in the data storage means is read out and multiplexed at a predetermined cycle for multiplexing. Multiplexed stream sending means for sending a stream,
When there is a change instruction for the digital broadcast data currently being transmitted, the digital broadcast data generation means is controlled to generate the changed digital broadcast data in accordance with the contents of the change instruction, and the changed digital broadcast Control means for performing control to write data into the second FIFO memory;
A data transmission device comprising: The data transmission apparatus according to claim 1, wherein the control unit further writes the changed digital broadcast data into the data storage unit. The digital broadcast data generating means generates LIT, which is specified by ARIB STD-B10 and is descriptive information of a local event that is an in-program event of a predetermined program, as the digital broadcast data. The data transmission device according to claim 1 or 2. 4. The data transmission according to claim 3, wherein the digital broadcast data generation means generates a LIT related to a program next to the currently broadcast program when a predetermined time before the end time of the currently broadcast program has elapsed. apparatus. The control means, after a lapse of a predetermined time before the end time of the currently broadcast program, when there is an instruction to change the local event of the currently broadcast program, 5. The data transmission apparatus according to claim 4, wherein the digital broadcast data generation means is controlled to generate LIT, and control is performed to write the changed LIT at least once in the second FIFO memory. When the digital broadcast data generating means displays an electronic coupon as one material of a local event in a program, the local event start time information and duration information, the electronic coupon data storage location information, and the continuation 6. The data transmission device according to claim 4, wherein LIT is generated that includes the validity period information of the electronic coupon that is prioritized over time information. The TS encoding unit performs TS encoding of any one of audio stream data, video stream data, and file stream data as the stream data. The data transmission device described in 1. Receiving the multiplexed stream, TS encoded data, digital broadcast data that is at least one of PSI (Program Specific Information) and SI (Service Information) of the digital broadcast standard adopting the MPEG-2 system; Multiplexed stream separating means for separating
TS decoding means for decoding TS encoded data separated by the multiplexed stream separation means;
Data reproducing means for reproducing the data decoded by the TS decoding means;
LIT extraction means for extracting LIT, which is specified by ARIB STD-B10 and which is description information of a local event that is an in-program event of a predetermined program, from the digital broadcast data separated by the multiplexed stream separation means;
First storage means for storing the LIT of the currently broadcast program extracted by the LIT extraction means;
Second storage means for storing the LIT of the program scheduled to be broadcast next extracted by the LIT extraction means;
Control means for performing control to switch the LIT stored in the second storage means and the LIT stored in the first storage means before a predetermined time before the program currently being broadcast ends;
Data processing means for processing the data decoded by the TS decoding means in accordance with the LIT stored in the first storage means;
A data receiving device. When the LIT extraction unit displays an electronic coupon as one material of a local event in a program, the local event start time information and duration information, data storage location information of the electronic coupon, and duration information The LIT having the electronic coupon validity period information prioritized over
The TS decoding means decodes the TS encoded data into the image data of the electronic coupon,
The data processing means outputs a predetermined material of the local event based on the start time information and the duration information, and outputs an electronic coupon of the local event based on the start time information and the validity period information The data receiving device according to claim 8, wherein the processing is performed. The data transmission apparatus according to any one of claims 4 to 6, which transmits a multiplexed stream;
The data receiving device according to claim 8 or 9, which receives a multiplexed stream sent from the data sending device;
Digital broadcasting system equipped with.