JP2001078104A - Data broadcast receiving device and data broadcasting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a broadcast receiving device for receiving a broadcast data service transmitted together with a broadcast signal without affecting a band width for providing another service by converting digital TV data which is not real time and is included in the broadcast data service into real time data. SOLUTION: A video processing part 6 extracts data from the reception signal of a selected video channel and displays the video channel in a display part 8. A data processing part 10 extracts whole kinds of broadcasting service data from the received signal. A storage part 12 outputs proper data to execute display in the display part 8 under the control of a control part 14. Voice and video data are extracted from the broadcast data service and stored in the storage part 12. When voice/video data are reproduced, data is read from the storage part 12 by a data rate required for reproducing the real time. The data parts are received while a user is not viewing the broadcast data service or during the stand-by of the data broadcast receiving device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data broadcast receiving apparatus and a data broadcast method, and more particularly, to a data broadcast receiving apparatus for selectively receiving a data service broadcast together with a broadcast signal and a data service using the broadcast signal. The present invention relates to a data broadcasting method for broadcasting.

[0002]

2. Description of the Related Art In recent years, digital television broadcasting, so-called digital television, has become widespread. Digital television system is MPEG (motion
(pictureexpert group) 2 The image is digitized and compressed using a compression technique. The broadcast image is encoded and transmitted as a digital data stream to a home television receiver. The digital television system has many advantages as compared with the conventional analog television system, such as an increased transmission capacity and resistance to noise and interference.

[0003] Also, in a broadcast for transmitting audio and video data by a digital television system, many types of data are transmitted without interruption. Therefore, many new services can be provided to a viewer through a digital television receiver (hereinafter, referred to as a digital TV receiver).

[0004] The well-known teletext service is an analog service using additional data sent by the broadcast signal. Teletext service is a vertical blanking period (vertical blank) of television signals.
ing interval; ) Is sent as digital data in a predetermined transmission line. VBI is
This is the period until the raster scan returns to the top of the screen, and this period is not used to send any significant image information. Several lines are reserved for teletext data, and the digital data is modulated into a broadcast television signal.

[0005] Teletext systems repeatedly broadcast a large number of "pages" of data. The page is typically updated every few minutes. The update cycle time depends on the number of pages broadcast in the cycle. Only a small bandwidth is used for teletext data. When the viewer selects a page, he must wait within the cycle time for the page to be delivered. The average latency is half of the total cycle time required for all pages.

[0006] Typical teletext systems provide the latest news, sports and TV guide information, reference information and advertisements. Teletext systems are very useful for obtaining "headline" information, such as, for example, sports results, where otherwise no information is available.

[0007] A popular use of teletext systems is to keep up to date with some ever-changing events, such as sporting events. Because sports events are often not broadcast live, they may be broadcast as part of a paid broadcast service, or they may have finished broadcasting and are broadcasting another program. Often this is the only way to get information. Therefore, viewers "missed" others, such as sporting events and newscasts
Content can be obtained using data services.

[0008]

The conventional broadcast data service has a problem that only a small amount of information can be sent, for example, only a score of a football game. The user may not want to see the entire sporting event, but may want to see a little more information besides the score, such as a video of a goal scene or a disappointing scene in a football game.

However, there is a further problem in providing such a service. Simple data services, such as teletext, can be easily provided on a narrow band. On the other hand, in order to provide higher-level data services including audio / video data, a wider band is required, and a longer time is required to update and replace information.

[0010] Since the objects of interest and the priorities differ from one viewer to another, information important to one viewer may be almost meaningless to another viewer. If the “highlights (special feature)” of the news are repeatedly broadcast every 15 minutes, even if one item desired by the viewer is included in the highlight, the viewer will be on average 7.5 times for this item. I won't wait a minute.

[0011] Digital broadcasting provides a wide bandwidth for program content. However, wide bandwidth is still very expensive. It is considered wasteful to devote a portion of bandwidth to broadcast data services when there is other content to be broadcast to a significant number of viewers. In fact,
Broadcast data services that broadcast live video and audio
Even using PEG2 compression technology occupies a bandwidth of about 2 Mbit / s.

[0012] The present invention has been proposed in view of the above-mentioned circumstances, and has a broadcast data receiving method for receiving a broadcast data service transmitted together with a broadcast signal without affecting a bandwidth for providing other services. It is an object to realize a broadcast data method for broadcasting a broadcast data service together with a device and a broadcast signal.

[0013]

In order to solve the above-mentioned problems, a data broadcast receiving apparatus according to the present invention includes non-real-time digital television data transmitted together with broadcast digital television data by a broadcast signal. In a data broadcast receiving apparatus for selectively providing a broadcast data service part, a data processing means for extracting the broadcast data service part from the broadcast signal, and a storage means for storing all current parts of the broadcast data service And control means for controlling a selected portion of the broadcast data service to be output according to a selection signal,
The data processing means converts non-real-time digital television data included in the broadcast data service into real-time data.

A data broadcasting method according to the present invention is a data broadcasting method for broadcasting a broadcast data service together with broadcast digital television data as a part of a broadcast signal, wherein the broadcast data service includes television data; Broadcasting the television data in real time instead of in real time.

According to the present invention, there is provided a data broadcasting method for broadcasting a broadcast data service together with broadcast digital television data as a part of a broadcast signal. The data broadcasting method includes the step of broadcasting a broadcast data service including television data as non-real time data.

In this way, a relatively narrow bandwidth can be allocated to the broadcast data service, and the television clip (cutout) is reproduced by the data broadcast receiving device as a part of the broadcast data service. The television clip is transmitted as non-real-time data for an extended period of time and is restored in the data receiving device.

Further, the data broadcasting method includes a step of processing and / or compressing the blocks of the television data collectively.

[0018] Therefore, compared to continuous processing or compression processing such as MPEG, television clips or television sequences can be acquired together before compression. As a result, compression can be performed with much higher efficiency than continuous processing used in ordinary broadcasting.

The blocks of the broadcast data service can also include data that needs to be decoded off-line.

In particular, blocks of data representing a television sequence or a video sequence can be compressed, broadcast as non-real-time data, and stored in a storage device of the data receiving device. This data can then be post-processed or decompressed off-line.

[0021] The data broadcasting method is performed in such a manner that the data broadcast receiving apparatus stores all the current parts of the broadcast data service, and updates the stored parts according to the replacement part received together with the broadcast signal. And broadcasting only those parts needed to replace each previous part of the broadcast data service that has been modified.

In the data broadcast receiving apparatus of the present invention, the bandwidth required for a high-level broadcast data service is reduced,
The cycle time is also minimized, and the data receiving device is provided with storage for storing all broadcast data services, so that the user can access it almost instantaneously.

Preferably, the data processing means processes the digital television data of the data portion in a compression and / or offline processing.

In this manner, a relatively narrow bandwidth available for broadcast data services can be effectively used. Television data is compressed to the maximum, regardless of the time it takes to decompress.

Preferably, the data processing means processes the data portion at a time when the usage rate is low.

Therefore, the data processing means can execute decompression and processing of the previously received / compressed television data even when performing other operations during operation of the data broadcast receiving apparatus.

The data processing means can directly process the data stored in the storage means. The data processing means can also process data loaded locally from the storage means as a group of data by a batch processing method. The batch processing method is particularly suitable when the storage means is provided separately from the data processing means, and the data processing means itself has a working memory.

The data processing means can perform processing using a predetermined protocol.

Thus, any processing or compression of the data may utilize existing protocols such as "WinZip".

The data processing means can also perform processing using the downloaded protocol. Thereby, the degree of freedom of the data broadcast receiving apparatus is increased, and / or unauthenticated expansion of data can be prevented.

Similarly, the data processing means can decrypt the data off-line using the key. This key is
It can be downloaded from media such as broadcasts, memory sticks or smart cards.

Preferably, the control means specifies a corresponding part of the extracted and stored data, and replaces the data part stored in the storage means with each part extracted from the broadcast signal.

Therefore, the data broadcast receiving apparatus can continuously update all the broadcast data services stored at the end of reception, and can take out any desired selected part of the broadcast data service almost instantaneously.

Preferably, the data broadcasting method further comprises the step of broadcasting all current parts of the broadcast data service so that all parts of the broadcast data service can be received immediately after the initial connection to the broadcast. This step may be implemented by using a separate dedicated channel or by periodically using an expanded bandwidth at a time when there is less demand for broadcast digital television data.

[0035] The data broadcast receiving apparatus may be provided with means for accessing all broadcast data services from different channels.

In this way, the current version of the broadcast data service can be stored in the storage means for an up-to-date update after the operation of the data broadcast receiving apparatus has been stopped for a certain period of time or after the initial connection.

The data receiving device may be configured as an integrated device including a digital television receiver. Note that various components of the data receiving apparatus may be separately configured and connected via a network means such as an IEEE 1394 interface.

All of the functions of the present invention can be provided by a single revision receiver / display. Note that the television / receiver must have a dedicated receiver to receive the broadcast data service part, or be connected to the broadcast data service device using the receiver of the television display device through the IEEE1394 interface. Can be. Similarly, the storage means may be connected to the broadcast data service device or separately from the broadcast data service device, for example, with a 1394 interface.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a data broadcast receiving apparatus and a data broadcast method according to the present invention will be described in detail with reference to the drawings.

MPEG (motion) for compressing video and audio
picture expert group) is designed to maximize the compression ratio of the broadcast data. Also, MPEG
The compression is designed so that expansion can be performed with a limited memory built in the data broadcast receiver. For this reason, the expander of the receiver requires less memory capacity and data processing amount than the head end of the transmitter, and can be configured at a low cost.

Although digital coding of information has made it possible to send multiple channels, the bandwidth for information transmission is still limited. MPEG audio and video channels are limited to certain bit rates depending on the available bit rates.

There is a trade-off between the number of channels that can be transmitted and the video quality of that channel. This is because the video quality of the channel depends on the bit rates of the compressed video and audio signals.

At present, in digital television broadcasting, many services are newly provided in addition to audio and video services. Along with data and information about programs, entirely new services such as home banking or home shopping are being offered.

Many data services are sent by "carousel", where data is broadcast every cycle. At some point, part of the data service is broadcast, and all data broadcasts take a predetermined period, such as 15 seconds or 3 minutes. After this period, the data is repeatedly broadcast with the exact same content data, or when an arbitrary part of the data needs to be changed, the part is changed and repeatedly broadcast. This method allows the receiver to receive all the signals of the service, but the data is sent over a relatively narrow bandwidth.

In the field of broadcasting, many of the systems currently in use are designed to utilize limited bandwidth and also assume limited memory and processing resources of the receiver.

In fact, this applies to current receivers with a fixed bandwidth. This is because the receiver needs to be configured at a low price so that the average user can use it at an affordable price.

Therefore, data broadcasting assumes that the receiver has only a limited memory capacity and processing capacity. For this reason, the format and type of data that can be transmitted are limited.

For example, data requiring a very high processing capability in a receiver or data requiring a large amount of memory capacity in a receiver in processing cannot be transmitted. This is because a receiver that can execute such processing is not realistic.

Here, it is conceivable to use a storage medium such as a magnetic disk or a semiconductor memory as a storage device for storing the transmitted digital broadcast. The use of a storage device enables a higher level of application to be used than in the case of using a conventional analog storage device.

Home AV equipment must be physically housed in separate housings and interconnected. In order to connect home digital devices to each other, the technology of the IEEE 1394 serial bus interface is important. IEEE13
The 94 serial bus interface provides a low cost and friendly way to transmit audio, video and control data between home appliances.

Therefore, a typical digital TV at home
The system can be, for example, a digital TV receiver, a display device, a magnetic storage device, and a DVD player all connected by an IEEE 1394 serial bus.

A mass storage device can be incorporated into a consumer device, or a mass storage device can be added.
For example, a large-capacity magnetic storage device can be incorporated in a digital television receiver.

Finally, “Memory Stick”
ck) "can also be used. "Memory Stick"
Is a nonvolatile memory stored in a small package so that data can be transferred between home AV devices such as a camera, a VTR integrated camera (camcoder), and a personal computer. There are also formats provided by other consumer electronic device manufacturers.

FIG. 1 is a block diagram showing a schematic configuration of a data broadcast receiving apparatus for receiving a broadcast data service.

The receiver 2 receives and demodulates data transmitted from an antenna, a cable, a satellite, or the like. The demodulated data includes digital television data as well as associated broadcast service data.

The video processor 6 extracts data from the received signal of the selected video channel under the control of the control panel 4 or a remote controller (not shown), and displays the data on the display unit (displey). 8 displays the video channel.

The data processor (processor) 10 extracts all broadcast service data from the received signal. These data are stored in the storage unit (memory) 12 under the control of the controller 14. Thereafter, the user can select a desired part of the data broadcasting service. The control panel 4 is used for the selection. Then, under the control of the control unit 14, the storage unit 12 outputs appropriate data to be displayed on the display unit 8.

The storage unit 12 is a mass storage device which can be constituted by a magnetic disk such as a hard disk drive or a semiconductor memory.

The data broadcast receiving device of FIG. 1 can be provided integrally in a television receiver. However, the components of the data broadcast receiving apparatus are, for example, IEEE1394.
It can be distributed and installed on a network using an interface. In FIG. 2, the digital TV receiver 2
2 and the storage device 24 are connected via an IEEE 1394 serial network. The storage device 24
Indicates that the digital TV receiver 2 is stored in the storage device 12 shown in FIG.
Reference numeral 2 corresponds to other parts of the data broadcast receiving device.

[0060] The data broadcast receiving device may be configured simply using an external storage device. Similarly, the data broadcast receiving device is a television display device (television d).
broadcast service device (broadcast serv) connected to isplay
(ice unit). The broadcast service device uses an internal memory or an external memory. In the case of a configuration in which the broadcast service device is integrated, the broadcast service device receives the received digital data from the receiver, appropriately processes the data portion, and supplies the selected portion to the television display device on demand. I do.

With respect to the transmission bandwidth of the broadcast service, audio / video streams typically use 2 Mbit / s using current MPEG2 compression technology. This transmission bandwidth appears uneconomical.

By using the storage unit 12, audio and video data broadcast at a speed slower than real time can be received. In the data broadcast receiving device, audio and video data are extracted from the broadcast data service and stored in the storage unit 12. When reproducing audio / video data, the data broadcast receiving device reads data from the storage unit 12 at a data rate required for real-time reproduction. As described above, when the broadcast rate of the audio / video data is reduced by half, the bandwidth used for the data service is also reduced by half. The cycle time is also doubled accordingly, but by using the storage unit 12, the access is instantaneous, except when the user happens to find the part of the audio / video data being broadcast.

By applying mass storage technology to consumer audio / video equipment at home, the processing capability and storage capacity of digital television receivers change significantly. The increased storage capacity allows various compression and pre-processing to be effectively applied to the broadcast data. With mass storage, broadcasts can be downloaded together as blocks of data. This block of data is processed together rather than as a broadcast stream, which is a small fragment of the broadcast data so that it can be processed by a normal receiver.

The large-capacity storage unit 12 can store data for later processing. by this,
The processing power of the receiver is significantly improved. Data broadcast receivers can store data "off-line" and process the data as a task performed in the background or at a time when the receiver is less used. When the processing of the data is completed, the processed data becomes available.

The "off-line" process can be performed in various ways.

For example, in the large-capacity storage unit 12, data can be directly processed off-line by the data processing unit 10 of the data broadcast receiving apparatus.

The data locally loaded as a group of data from the large-capacity storage unit 12 can be executed by the data processing unit 10 of the data broadcast receiving apparatus.

Further, a "batch" process can be performed by the local data processing unit 10 for the large-capacity storage unit 12.

There are various ways to process the data stored in the mass storage 12 to provide the "processed" data for use by the data broadcast receiver.

Post-processing or decompression of data is described in “WinZi
This can be performed using an existing predetermined protocol such as "p".

Post-processing or decompression of data can be performed using the downloaded protocol.

Data post-processing is performed to provide a new set of data. For example, by processing two video streams, for example, the "reversal angle (revers
e angle) or a “birds eye”.

The data can be decrypted off-line using a key provided to the user by broadcast, memory stick or smart card or the like.

In some cases, data input from another signal source is post-processed using broadcast data.

The video data is stored in an electronic mail, a memory stick, i. For transmission later by LINK or the like, for example, the DV of a digital VTR integrated camera
It can be compressed or processed like a format.
For example, a digital VTR-integrated camera retransmits data in DV format.

It is also considered inefficient to occupy the bandwidth due to bandwidth that is not a "real" live broadcast such as a movie, news and sports broadcast, but rather a content that changes only slightly over time. Can be

In a service that repeats part of the broadcast data service, there is a trade-off between the bandwidth used by the service and the cycle rate. When a wide band is used, the service update speed, that is, the cycle time is increased. Reducing bandwidth increases cycle time.

When broadcasting a broadcast data service such as teletext, the data is periodically processed and provided to the user. Here, a high-level broadcast data service including a lot of data can be provided. If the bandwidth is narrow, the cycle time will be long. Especially when high-level services, including audio / video clips and audio / video data, require very long cycle times, this service is an application for fast newsflash updates of daily news or sporting events. Not suitable for

To address this problem, the user can instantly view any part of the service at any time,
The entire cycle of the broadcast data service should be stored.
The storage unit 12 stores all parts of the cycle of the broadcast data service. In practice, the data portion is received when the user is not watching the broadcast data service or when the data broadcast receiving device is on standby.

The most noticeable parameter for the user of this service is the cycle speed, ie the frequency of updates. Viewers will want to get the latest information as quickly as possible. Therefore, this is one of the important requirements of the service. On the other hand, for service providers, the bandwidth used is probably the most important parameter. In particular, the bandwidth occupied by data broadcast services affects the bandwidth available for other broadcast data services and the television data itself. Thus, reducing the bandwidth of other services is disadvantageous to service providers.

In many broadcast data services, most of the broadcast data services are not updated on a cycle-by-cycle basis. For conventional types of pages, such as teletext, most of the pages are often unchanged between cycles.
Similarly, when transmitting audio / video news or sports clips via a broadcast data service, the same clips are used over a long period of time during the day.

For this reason, only the part of the data broadcasting service changed between cycles is transmitted. In this way, service providers can efficiently use bandwidth,
Information about the service can be updated relatively quickly.

There are many different types of broadcast data services. In a broadcast data service, major information topics may be transmitted repeatedly like a carousel. Within each topic, the sub-carousel
Further data portions may be repeatedly transmitted as usel). Each data portion may consist of other types of data, such as pages of conventional format data, image data or audio / video data. All pages or audio /
The video data sequence can be considered as one part, but can also be composed of several parts. In any case, as in the case of updating all broadcast services, the data of the replacement part must be provided individually. Thus, individual data bytes or groups of bytes can be considered "portions" if they can be replaced individually. However, for very small parts, such as individual bytes, the protocol overhead may be too large.

In a data broadcast receiving apparatus that does not store previously transmitted content, "differential" content is not useful because it does not store all services.
This situation occurs, for example, when a storage device is first connected to a broadcast service device.

By gradually storing the updated portion, it is possible to configure a data broadcast receiving apparatus that restores a complete broadcast data service. It should be noted that all services may be broadcast on different dedicated channels (eg, download services other than broadcast) or at a time when the demand for conventional broadcast is low. FIG. 3 shows that at these times the bandwidth allocated to conventional services can be reduced.

That is, from 4:00 am (4 pm) to 3:00 am (3 pm) of the next day, the conventional service and news flash service differential update are transmitted periodically every day. Between 3:00 am and 4:00 am when the demand for the conventional service is low, all the update data of the conventional service and the news flash service are transmitted. The bandwidth used to transmit these broadcasts is constant over time,
All updates to the Newsflash service have closed wider bandwidths than incremental updates to the Newsflash service.

As a result, the bandwidth of the broadcast data service can be widened. Thus, the data broadcast receiving apparatus can quickly update the stored broadcast service information together with the all information services. by this,
In a normal method, the data broadcast receiving apparatus can maintain the service in the latest state using the difference update stream.

As mentioned above, services using the data broadcasting method not only carry audio and video data encoded with MPEG2 compression technology, but also other, more suitable,
Alternatively, compressed and encoded information can be sent using an efficient protocol. For example, a football game can take advantage of the fact that most of the content is characterized by a large amount of green, including negligible moving areas.

In this case, an algorithm for decompression and decoding can be distributed to the data broadcast receiving apparatus, and thereafter, can be executed by the data broadcast receiving apparatus using a predetermined protocol.

Since the received broadcast service data is stored off-line and there is no need to execute decoding in real time, the conditions for decompression and decoding are not strict. Therefore, the data processing unit 1 of the data broadcast receiving device
0 can execute the decryption of the content for later display as a task to be performed in the background.

The data content of the broadcast data service need not be limited to audio / video data or conventional data pages. The content is suitable for being used by an engine in a data broadcast receiving device / broadcast service data device. In this way, a composite service featuring text, graphics and audio / video clips is provided.

The data portion can also include data that needs to be decoded off-line. This data need not necessarily be a program, but can be any type of data.

MPEG compression and decompression devices are used in broadcast devices where the limited storage for decompression in the data broadcast receiver has only a small (on the order of one second) delay in decoding delay and limited "pickup" delay. Designed to be used. Here, the “pickup” delay is a delay when the data broadcast receiving device starts up, and the data broadcast receiving device picks up (receives) the transmission.
However, when starting decoding, it is necessary to wait several frames for all “I frames (intra-coded images)”.

According to the present invention, it is possible to use a compression / decompression program that enables data files to be executed collectively. In particular, storing data off-line allows for compression / decompression and can include an MPEG transport stream off-line to provide very small files.

[0095]

As described above, according to the present invention, a method for broadcasting a data service together with a broadcast signal without affecting the bandwidth for performing other services, and a method for selectively providing a part of a broadcast data service to a user. To provide a system for providing the information.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a data broadcast receiving device.

FIG. 2 is a diagram illustrating a configuration of a distributed data broadcast receiving device.

FIG. 3 is a diagram illustrating a conventional service bandwidth reduction.

[Explanation of symbols]

2 receiving section, 4 control panel, 6 video processing section, 8 display section, 10 data processing section, 12 storage section, 14 control section

Claims (23)

[Claims] 1. A data broadcast receiving apparatus for selectively receiving a portion of a broadcast data service including non-real-time digital television data transmitted together with broadcast digital television data by a broadcast signal, comprising: Data processing means for extracting a part of the data service; storage means for storing all the current parts of the broadcast data service; and controlling to output the selected part of the broadcast data service in response to a selection signal. A data broadcast receiving apparatus, comprising: control means; wherein the data processing means converts non-real-time digital television data included in the broadcast data service into real-time data. 2. The broadcast data service part according to claim 1, wherein the part of the broadcast data service is compressed and / or processed, and the data processing means processes the part of the broadcast data service offline. Data broadcast receiving device. 3. The data broadcast receiving apparatus according to claim 2, wherein said data processing means processes the broadcast data service portion at a time when the usage rate is low. 4. The data broadcast receiving apparatus according to claim 1, wherein said data processing means directly operates said broadcast data service stored in said storage means. 5. The data broadcast receiving apparatus according to claim 1, wherein said data processing means operates a group of data locally loaded from said storage means in a batch processing manner. 6. The data broadcast receiving apparatus according to claim 1, wherein said data processing means executes processing using a predetermined protocol. 7. The data broadcast receiving device according to claim 1, wherein said data processing means executes processing using a downloaded protocol. 8. The data broadcast receiving apparatus according to claim 1, wherein said data processing means decrypts the data offline using a key. 9. The data broadcast receiving device according to claim 1, wherein said storage means is a magnetic hard disk drive or a semiconductor memory. 10. The data broadcast receiving apparatus according to claim 1, further comprising a digital television receiver for supplying said broadcast signal to said data processing means. 11. The data broadcast receiving device according to claim 10, wherein the data broadcast receiving device is configured as an integrated device. 12. At least the storage means is configured as a separate device from the digital television receiver,
The data broadcast receiving device according to claim 10, wherein the data broadcast receiving device is connected by a network connection unit. 13. The digital television receiver selectively supplies digital television data for display,
2. The data processing unit according to claim 1, wherein the data processing unit extracts the broadcast data service portion regardless of the display.
0. The data broadcast receiving apparatus according to item 0. 14. The control means identifies a corresponding part of the broadcast data service extracted and stored, and identifies the part of the broadcast data service stored in the storage means from the broadcast signal extracted from the broadcast signal. 2. The data broadcast receiving device according to claim 1, wherein the data broadcast receiving device is replaced with a data service part. 15. The broadcast signal periodically including all parts of the broadcast data service, and the control means stores all received parts of the broadcast data service in the storage means. Item 15. The data broadcast receiving device according to Item 14. 16. The data broadcast according to claim 14, wherein said control means accesses an additional data channel so as to obtain all parts of said broadcast data service and store them in said storage means. Receiver. 17. A data broadcasting method for broadcasting a broadcast data service together with broadcast digital television data as a part of a broadcast signal, wherein the broadcast data service includes television data;
A data broadcasting method, comprising the step of broadcasting television data of the broadcast data service in real time instead of in real time. 18. The data broadcasting method according to claim 17, further comprising a step of collectively processing and / or compressing the blocks of the television data. 19. The system according to claim 18, wherein said blocks include data requiring off-line decoding.
Data broadcasting method described. 20. Normal broadcast, such that the receiver of the broadcast signal stores all of the current portion of the broadcast data service and updates the stored portion with a replacement portion received by the broadcast signal. 18. The data broadcasting method according to claim 17, further comprising the step of: broadcasting only a part necessary to replace a previous part changed in the broadcast data service. 21. The method of claim 21, further comprising the step of adding and broadcasting all the current parts of the broadcast data service so that all parts of the broadcast data service can be obtained immediately after the initial connection. Item 21. The data broadcasting method according to Item 20. 22. The data broadcasting method according to claim 21, wherein all the current portions of the broadcast data service are broadcast using a separate dedicated channel. 23. The current portion of the broadcast data service is periodically broadcast using an extended bandwidth during times when the demand for the broadcast digital television data is low. 22. The data broadcasting method according to claim 21, wherein: