JP2000032413A - Data transmission method, data transmission system, and data reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a system to cope simply with a case in which a data display form differs by transmitting additional data with identification data denoting a display form added thereto from a transmitter side and allowing a receiver side to discriminate whether the additional data is display data or download data based on the identification data and processing the data. SOLUTION: A ground station 1 for a digital satellite broadcast in a music contents distribution system receives resources of television program broadcast from a television program resource servers 6, music data resources from a music resource server 7, audio added information from an audio added information server 8, and GUI data from a GUI data server 9. The television program resource server 6 serves as the resources of conventional music broadcast programs. The resources of music broadcast sent from the television program resource servers 6 are animations and audio data and, for example, promotion purpose animation and audio are broadcast.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a data transmission method, a data transmission device, and a reception device suitable for use in a system for performing music broadcasting by digital satellite broadcasting.

[0002]

2. Description of the Related Art Digital satellite broadcasting has been widely used. Digital satellite broadcasting is more resistant to noise and fading than conventional analog broadcasting, and can transmit high-quality signals. Further, the frequency use efficiency is improved, and the number of channels can be increased. For example, in digital satellite broadcasting, one satellite can secure several hundred channels. In such digital satellite broadcasting, a large number of specialized channels for sports, movies, music, news, etc. are prepared, and programs of respective specialized contents are broadcasted on these specialized channels.

[0003] Among these specialty channels, the music channel is one of the popular channels, and a promotion program mainly for introducing new songs and hit songs is broadcast.

As described above, in a conventional music channel, a new song introduction or a hit song program is transmitted as a moving image and a sound. When the viewer sees such a music channel and finds a favorite song, the viewer may want to purchase a CD or the like of the introduced song and enjoy it. Further, there are times when it is desired to know the information of the artist of the music or the information of the album in which the music is stored. If you are watching a music program and want to know the artist information of the song or the information of the album that contains the song, you can get the information on the spot, and if you find a song you like, It would be very convenient to be able to download the audio data.

[0005] However, in a conventional music channel, a moving image and a sound related to a music are transmitted unilaterally.
Such a request cannot be met.

In order to solve such a problem, information on music broadcast on a music channel can be easily obtained, and the music data can be easily downloaded to a data storage device. A music content distribution system has been proposed.

In such a music content distribution system, in addition to moving picture data and audio data, music information, music artist information, music explanations, lyrics, etc., are text data and still images such as CD jacket images. Data is sent. Upon receiving such a music content distribution system channel and performing necessary operations,
These text data and still images such as jackets are displayed on the screen.

[0008]

In such a music content distribution system, received music data is recorded by, for example, an MD (Mini Disc) recorder / player. In the MD, text data such as a song title can be recorded in addition to music data. Further, it has been proposed to record still image data on an MD.

Therefore, when music data is recorded by an MD recorder / player, not only music data but also text data such as music information, music artist information, music commentary, lyrics and the like can be easily recorded. Is desired. When the MD recorder / player has a function of recording a still image, it is desirable that the MD recorder / player can record still image data such as a jacket image.

However, the code system of the text data transmitted by satellite broadcasting is a subset of the teletext multiplex code, whereas the text data recorded by MD is an ASCII code or a music shift JIS code. The coding system is different. Also, still images are generated in a small window on the broadcast screen, so if they are recorded on the MD as they are, the image size will be insufficient.

As described above, for text data,
The code system for display and the code system for recording are different. Also, for a still image, the optimal image size for display and the optimal image side for recording are different. Therefore, if the same data for display and data for recording is used for text data and still image data,
Code conversion processing is required, which complicates the processing and increases hardware.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a data transmission method, a data transmission device, and a reception device that can easily cope with a case where display formats are different between display data and download data.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a data transmission method for transmitting additional data together with video data and audio data. And the data for download are generated as additional data, the identification data indicating the display format is added to the additional data and transmitted, and on the receiving side, the additional data received from the identification data is the display data or the download data. This is a data transmission method in which data is displayed for display and data for download is transferred to a storage device.

According to the present invention, in a data transmission method for transmitting additional data together with video data and audio data, the display data and the download data having the same contents but different display formats are added to each other. And a means for transmitting the additional data by adding identification data indicating a display format to the additional data.

According to the present invention, in a data receiving apparatus for receiving video data and audio data and receiving additional data, the additional data includes display data and download data having the same contents but different display formats. Is transmitted, and identification data indicating a display format is added to the additional data, and means for determining whether the additional data received from the identification data is display data or download data, and display if the display data is used. The data receiving device is provided with means for transferring data to be downloaded to a storage device.

As additional data, display data and download data having the same contents but different display formats are sent. That is, the same text data is transmitted in two formats, that is, text data of a subset of the teletext multiplex code for screen display and text data of ASCII code or music shift JIS code for download. Also, for still images, a small image size for display,
Two sizes are formed, one of a larger image size for download. For this reason, additional data can be directly displayed or sent to a storage device, and format conversion is not required.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The system to which the present invention is applied broadcasts a music program using digital satellite broadcasting, and distributes audio data related to the music program so that a viewer can listen to the music program. If you listen to a song that you like, you can easily purchase the song on the spot.

FIG. 1 shows the overall configuration of a music content distribution system to which the present invention is applied. As shown in the figure, the ground station 1 for digital satellite broadcasting includes a material for television program broadcasting from a television program material server 6, a material for music data from a music material server 7, and an additional audio information server 8 Additional information from the
GUI data from an I (Graphical User Interface) data server 9 is sent.

The television program material server 6 is a server that provides materials of a normal music broadcast program. The material of the music broadcast sent from the television program material server 6 is a moving image and a sound.
For example, a moving image and sound for promotion of a new song introduction are broadcasted, or a countdown of the latest hit songs is broadcasted.

The music material server 7 is a server that provides an audio program using an audio channel. The material of this audio program is audio only. The music material server 7 sends materials of audio programs of a plurality of audio channels to the ground station 1. In the program broadcasting of each audio channel, the same music is repeatedly broadcast for a predetermined unit time. Each audio channel is independent, and various usages can be considered. For example, one audio channel repeatedly broadcasts a recommended song in the latest Japanese pop music for a predetermined time, and another audio channel broadcasts a recommended song.
The recommended song in the latest American pop is repeatedly broadcast for a predetermined time, and in other audio channels,
The recommended music may be repeatedly broadcasted from jazz for a predetermined time. Also, a plurality of songs of the same artist may be divided into respective audio channels and repeatedly broadcast.

The additional audio information server 8 provides time information of music output from the music material server 7.

The GUI data server 9 includes data for forming a screen of a list page of distributed music and an information page of each music, data for forming still image data of a jacket, and an EPG (Electric Program Guide). To provide data for forming the screen of FIG. As will be described later in detail, in a system to which the present invention is applied, lyrics of music to be distributed, artist concert information, and the like can be displayed on the screen by operating a GUI on the screen. Also, by operating the GUI on the screen, it is possible to select a music piece, download it, make a reservation for it, and the like. The data for that purpose is sent from the GUI data server 9. The GUI data includes, for example, MHEG (Multimedia and Hypermedia Information
Coding Experts Group) method is used.

The ground station 1 includes the above-described video data and audio data as the material of the music program broadcast from the television program material server 6 and the audio data as the material of the audio channel from the music material server 7.
The voice additional information from the voice additional information server and the GUI data from the GUI data server 9 are multiplexed and transmitted. At this time, the video data of the television program broadcast is compressed by, for example, the MPEG (Moving Picture Experts Group) method, and the audio data of the television program broadcast is compressed by the MPEG audio method. The audio data of each audio channel is divided into two different formats, for example, MPEG audio format and ATRAC (Ad
It is compressed by the aptive transform Acoustic Coding method. These data are encrypted using key information from the key information server 10 at the time of multiplexing.

In the digital satellite broadcasting system,
The billing contract includes a flat system in which a predetermined fee is paid every predetermined period and a PPV system in which a fee is paid according to the content every time the content is viewed.
The main television program is billed in a flat manner, and music data to be downloaded is
Charging is performed by the PV method. In the PPV method, scrambling is performed in units of one event. In the case of music data, the same music data is repeatedly transmitted multiple times within one event.

The signal from the ground station 1 is received by the receiving equipment 3 of each home via the satellite 2. The satellite 2 has a plurality of transponders. One transponder has a transmission capacity of, for example, 30 Mbps. As the receiving equipment 3 of each home, a parabolic antenna 11 and an IRD
(Integrated Receiver Decoder) 12, a storage device 13, and a television receiver 14 are prepared.

The parabolic antenna 11 receives the signal transmitted via the satellite 2. This received signal is transmitted to an LNB (Low Noise Bl) attached to the parabolic antenna 11.
ockDownconverter) 15 is converted to a predetermined frequency,
It is supplied to IRD12.

The IRD 12 selects a program of a predetermined program from a received signal and demodulates video data and audio data. In addition, the IRD 12 includes a list page of music to be distributed, an information page of each music,
A screen for EPG is formed. Then, the output of the IRD 12 is supplied to the television receiver 14.

The storage device 13 is for storing downloaded audio data.
For example, as the storage device 13, an MD (Mini
Disc) Recorder / player, DAT (Digital Audio)
Tape) Recorder / player, DVD (Digital Video Di)
sc) A recorder / player can be used. Further, a personal computer is used as the storage device 13 and its hard disk or CD-R (CD-Recor
dable) can also store audio data.

The IRD 12 is connected to the accounting server 5 via the telephone line 4, for example. An IC card in which various information is stored is inserted into the IRD 12. When the audio data of the music is downloaded, the information is
It is stored on the C card. The information of the IC card is sent to the accounting server 5 via the telephone line 4. The billing server 5 performs appropriate billing from the download information and bills the viewer. As described above, by performing appropriate charging, the copyright of the downloaded music can be protected.

As described above, in the system to which the present invention is applied, the ground station 1 includes the video data and audio data serving as the material of the music program broadcast from the television program material server 6 and the audio data from the music material server 7. The audio data serving as the material of the channel, the audio additional information data from the audio additional information server 8, and the GUI data from the GUI data server 9 are multiplexed and transmitted. Then, when this broadcast is received by the receiving facility 3 of each home, a music program is viewed, and a GUI screen is displayed based on the transmitted GUI data. When a necessary operation is performed while viewing the GUI screen, an information page for each song can be viewed, and a preview of each song can be performed. Further, by performing necessary operations while viewing the GUI screen, audio data of a desired music piece can be downloaded and stored in the storage device 13.

Next, the operation of the viewer in the receiving facility 3 will be described in more detail. When this broadcast is received by the receiving facility 3 of each home, a screen as shown in FIG. 2 is displayed on the television receiver 14. A moving image based on the music program provided from the television program material server 6 is displayed in the television program display area 21A at the upper left of the screen. In the upper right part of the screen, a list 21B of songs of each channel being broadcast on the audio channel is displayed. A text display area 2 is located at the lower left of the screen.
1C and a jacket display area 21D are set. Furthermore, a lyrics display button 22, a profile display button 23, an information display button 24, a reservation recording button 25, a reservation list display button 26, a recording history display button 27, and a download button 28 are displayed on the right side of the screen.

The viewer searches for a song of interest while looking at the song name displayed in the list 21B.
When the user finds a song of interest, the user operates the arrow keys of the remote commander to move the cursor to the song, and then presses the enter key of the remote commander attached to the IRD 12. As a result, it is possible to listen to the music piece with the cursor. That is, in each audio channel, the same music is repeatedly broadcast during a predetermined unit time, so that the television program display area 21A
Is switched to the audio channel of the song without changing the screen, and the song can be heard. At this time, a still image of the CD jacket of the music is displayed in the jacket display area 21D.

In this state, when the cursor is moved to the lyrics display button 22 and the enter key is pressed (hereinafter, the operation of moving the cursor to the button and pressing the enter key is called the button), the lyrics of the music are displayed in the text display area 21C. Displayed at the timing synchronized with the audio data. Similarly, when the profile display button 23 or the information display button 24 is pressed, the artist profile or concert information corresponding to the music is displayed in the text display area 21C. In this way, the viewer can know what kind of music is currently being distributed,
You can know detailed information about each song.

The viewer presses the download button 28 when he / she wants to purchase the sampled music. When the download button 28 is pressed, the audio data of the selected music is downloaded and stored in the storage device 13. Along with the audio data of the music, lyrics data, artist profile information, jacket still image data, and the like can be downloaded. Every time a song is downloaded, its information is stored in an IC in the IRD12.
Stored on the card. The information stored on the IC card
For example, it is downloaded to the accounting server 5 once a month. Thereby, the copyright of the downloaded music can be protected.

When the viewer wants to make a reservation for download in advance, he presses the reservation recording button 25.
When this button is pressed, the GUI screen is switched, and a list of songs that can be reserved is displayed on the entire screen. This list can display music searched in units of one hour, one week, or genre. When the viewer selects a song to be reserved for download from this list, the information is registered in the IRD 12. And
If you want to check the songs that have already been reserved for download, press the reserved list display button 26,
It can be displayed on the entire screen. The music thus reserved is downloaded by the IRD 12 at the reserved time and stored in the storage device 13.

When the viewer wants to check the downloaded music, the recording history button 27 can be pressed to display a list of already downloaded music on the entire screen.

As described above, in the receiving equipment 3 of the system to which the present invention is applied, the GUI of the television receiver 14 is used.
A list of songs is displayed on the screen. And this GU
When a song is selected in accordance with the display on the I screen, the song can be previewed, and the lyrics of the song, the artist profile, and the like can be known. Further, it is possible to perform downloading of music and reservation thereof, display of a download history and a list of reserved music, and the like.

As described above, in the music content distribution system to which the present invention is applied, music broadcast programs are distributed, and audio data of music is distributed using a plurality of audio channels. Then, the user can search for a desired music using a list of the music that has been distributed, and can easily store the audio data in the storage device 13. Hereinafter, such a system will be described in more detail.

FIG. 3 shows the configuration of the ground station 1 in the music content distribution system to which the present invention is applied.

In FIG. 3, material data from the television program material registration system 31 is registered in the AV server 35. This material data is video data and audio data. The data registered in the AV server 35 is sent to a television program transmission system 39, where the video data is compressed by, for example, the MPEG2 system, and the audio data is compressed and packetized by, for example, the MPEG2 audio system. The output of the television program transmission system 39 is sent to the multiplexer 44.

The audio data from the music material registration system 32 is an MPEG2 audio encoder 3
6A and the ATRAC encoder 36B, after being encoded respectively, the MPEG audio server 40
A and registered in ATRAC audio server 40B. MP registered in the MPEG audio server 40A
The EG audio data is sent to the MPEG audio transmission system 43A, where it is packetized and sent to the multiplexer 44. ATRAC data registered in the ATRAC audio server 40B is ATRAC data.
The data is sent to the audio transmission system 43B as quadruple-speed ATRAC data, packetized here, and sent to the multiplexer 44.

Further, the additional audio information from the additional audio information registration system 33 is registered in the additional audio information database 37. The additional audio information registered in the additional audio information database 37 is sent to the additional audio information transmitting system 41, where it is packetized,
Sent to

The GUI data from the GUI material registration system 34 is registered in the GUI material database 38. GU registered in the GUI material database 38
The I material data is sent to the GUI authoring system 42, where the GUI screen data is processed and packetized, and then sent to the multiplexer 44. Here, the GUI material data includes still image information of a jacket, lyric information of music, concert information of an artist, and the like. Still image information is, for example, JPEG (Joint Photograp).
hic Experts Group).

When an MD recorder / player is used as the storage device 13 (FIG. 1),
Text data such as lyrics can be directly recorded on the MD. Further, an MD capable of recording a still image has been proposed. M as the storage device 13
When a D recorder / player is used, still image information such as a jacket and text data such as a title of a music are
In addition to displaying on the television receiver 14 on the receiver side,
It is desired to be able to record directly on the MD.

However, the code system of the text data sent by satellite broadcasting is a subset of the teletext multiplex code, whereas the text data recorded by MD is ASCII code or music shift JIS code. The coding system is different.

Therefore, in the authoring system 42, text data of a subset of the teletext multiplex code to be displayed on the television receiver 14 and text data of ASCII code or music shift JIS code for download to the storage device 13 are stored. The same text data is formed in these two formats. Also, the still images are of a small image size to be displayed in the jacket display area 21D (FIG. 2) and a full size of the full image downloaded to the storage device 13 and displayed using the entire screen.
One size is formed.

Then, these GUI data are stored in MHE
Sent based on the G5 system. Mono-media, such as still images and audio, can be stored in M
HEG5 content is created. The created content is DSM-CC (Digital Storage Media-Comman
d and Control) format.

That is, DSM is used as MHEG content.
When transmitting these data in the format of -CC, the data is transmitted as shown in FIG. As shown in FIG. 4, the MHEG script content has a directory structure. The files in this are text and still image data. As for files such as still images and texts, two types of files F1, F11, and F21 for display and files F2, F22, and 32 for download are prepared. The file body of each file is provided with a header section for identifying information type, character code type, and the like.
When sending this, a directory is added, and further through the process of TS packetization and sectioning,
Sent out. Therefore, the receiving side can identify the type of information, the character code type, and the like by referring to the header.

In FIG. 3, a multiplexer 44 includes a video packet and an audio packet from the television program transmission system 39, an audio packet from the MPEG audio transmission system 43A,
4 × speed audio packet from ATRAC audio transmission system 43B and audio additional information transmission system 41
And a GUI data packet from the GUI authoring system 42 are time-division multiplexed and encrypted using key information from the key information server 10 (FIG. 1).

The output of the multiplexer 44 is sent to a radio wave transmission system 45 where an error correction code is added, modulated,
After being subjected to processing such as frequency conversion and the like, it is transmitted from the antenna to the satellite 2.

FIG. 5 shows an example of data transmitted from the ground station 1. Each data shown in this figure is actually multiplexed on the time axis. As shown in FIG. 5, one event is between time t1 and time t2, and the next event is from time t2. An event is a unit for changing the lineup of music, and is usually in units of 30 minutes or 1 hour. For example, it is conceivable to broadcast the 20th to 11th of the top 20 of the latest hit songs in an earlier event, and broadcast the 10th to 1st in a later event. This event is a unit of encryption.

As shown in FIG. 5, from time t1 to time t2
In the event (1), a music program having a predetermined content A1 is being broadcast in a normal video program broadcast. Time t
In the event starting from 2, a music program having a predetermined content A2 is broadcast. What is broadcast on this normal music program is moving images and audio.

The audio channels are prepared, for example, for ten channels CH1 to CH10.
At this time, each audio channel CH1, CH2, C
In H3,..., CH10, the same music is repeatedly transmitted during one event. That is, in the event from time t1 to time t2, the audio channel CH
1, the music B1 is repeatedly transmitted, the music C1 is repeatedly transmitted on the audio channel CH2, and thereafter, the music K1 is similarly transmitted on the audio channel CH10.
Is repeatedly transmitted. In the event starting from the time t2, the music B2 is repeatedly transmitted on the audio channel CH1, the music C2 is repeatedly transmitted on the audio channel CH2, and thereafter, the music K2 is repeatedly transmitted on the audio channel CH10. This is common to the MPEG audio channel and the 4 × ATRAC audio channel.

That is, in FIG. 5, the same numbers in parentheses, which are the channel numbers of the MPEG audio channel and the 4 × ATRAC audio channel, relate to the same music. The number in parentheses, which is the channel number of the additional audio information, is the additional audio information added to the audio data having the same channel number. Still image data and text data transmitted as GUI data are also formed for each channel. These data are transmitted in a time-division multiplexed manner in an MPEG2 transport packet, and are reconstructed in the IRD 12 using the header information of each data packet.

Next, the receiving facility 3 in each home will be described. As shown in FIG. 1, the receiving facilities in each home include:
A parabolic antenna 11, an IRD 12, a storage device 13, and a television receiver 14 are provided. Here, as the IRD 12, as shown in FIG. 6A,
An analog audio output terminal Aout, a digital audio output terminal Dout such as IEC958 for transmitting audio data via an optical cable, and a digital interface terminal Dif such as IEEE1394 are provided. Therefore, the storage device 13 having only the analog audio input terminal Ain, IE
A device having a PCM audio input terminal Din such as C958 or a device having a bidirectional digital interface terminal Dif such as IEEE1394 can be connected.

As shown in FIG. 6B, when a storage device 13A having only an analog audio input terminal Ain is used as a storage device,
An analog output terminal Aout of the IRD 12 and an analog input terminal Ain of the storage device 13A are connected by an analog cable. As shown in FIG. 6C, a PCM such as IEC958 is used as a storage device.
When the storage device 13B having the audio input terminal Din is used, the digital output terminal Dout of the IRD 12 and the digital input terminal Din of the storage device 13B are connected by, for example, an IEC958 optical fiber. Further, as shown in FIG. 6D, when a storage device 13C having a bidirectional digital interface terminal Dif such as IEEE1394 is used as a storage device,
Digital interface terminal Dif of D12 and digital interface terminal D of storage device 13C.
is connected with a digital interface cable.

As shown in FIG. 6B, when a storage device having no digital input terminal is used, the downloaded MPEG audio data is subjected to MPEG2 decoding processing in the IRD 12, and further to D / A conversion and output from an analog audio output terminal Aout. Then, the storage device 13A is connected from the IRD 12 via an analog cable.
Sent to In this case, a configuration is adopted in which a control signal is exchanged between the IRD 12 and the storage device 13A using wireless communication such as infrared rays or wired communication using a cable to confirm a connection relationship and a download operation. It is also possible.

As shown in FIG. 6C, when the storage device 13B having the PCM audio input terminal Din is used as the storage device, the downloaded MPEG audio data is stored in the IRD 12
The decoding process of MPEG2 is performed within the device, and the IRD 12 outputs the data as PCM audio data. And IR
From D12, it is sent to the storage device 13B via, for example, an IEC958 optical cable. Again, I
A control signal may be exchanged between the RD 12 and the storage device 13A using wireless communication such as infrared rays or wired communication using a cable to confirm a connection relationship or a download operation. is there.

As a specific example of the case shown in FIG. 6D, IE
When an MD recorder / player having a bidirectional digital interface terminal Dif such as EE1394 is used as a storage device, the downloaded quadruple-speed ATRAC data is directly sent from the IRD 12 via, for example, an IEEE1394 digital interface cable. Sent to storage device.

As described above, the devices used as the storage device 13 include analog input devices, PCs, and the like.
There are three systems, one for inputting M audio data and one for inputting ATRAC data.

FIG. 7 shows an example of the configuration of the IRD 12. The IRD 12 has an input terminal T1, an analog video output terminal T as an external terminal or an interface.
2, an analog audio output terminal T3, T4, an optical digital output interface 59, an IEEE 1394 interface 60, a man-machine interface 61, an IC card slot 62, and a modem 63.

The received signal input to input terminal T 1 is supplied to tuner 51. In the tuner 51, the control C
Based on a setting signal from a PU (Central Processing Unit) 58, a signal of a predetermined carrier frequency is selected from the received signals. Then, this received signal is QPSK (Quad
rature Phase Shift Keying) is demodulated, further subjected to error correction processing, and an MPEG transport stream is output.

The output of the tuner 51 is supplied to a descrambler 52. The received ECM data and EMM data are input to the descrambler 52,
The descrambling key data stored in the IC card 65 is input via the IC card slot 62 and the control CPU 58. The descrambler 53 stores the received ECM data and EMM data with the IC card 6
5, the MPEG transport stream is descrambled. The descrambled MPEG transport stream is transport I
It is sent to C53.

The transport IC 53 separates a desired packet from the stream from the descrambler 52 based on a command from the CPU 58.
In a transmission packet, a packet identifier (PI
D) is provided. A desired packet is extracted based on the PID, and the packet is sent to the MPEG audio decoder 54 and the MPEG video decoder 55.

The video signal packet is sent to the MPEG video decoder 55. The audio signal packet is MPE
It is sent to the G audio decoder 54.

The MPEG video decoder 55 receives the video signal packet from the transport IC 53,
An MPEG2 decoding process is performed to form video data before data compression. This video data is N
The signal is supplied to the TSC conversion circuit 57 and the NTSC conversion circuit 57
Then, the video data decoded by the MPEG video decoder 55 is converted into a composite video signal and converted into an analog signal. The output of the NTSC conversion circuit 57 is output from the analog video output terminal T2 to the television receiver 14.

The MPEG audio decoder 54 receives the video signal packet from the transport IC 53 and performs MPEG audio decoding to form audio data before data compression. The decoded audio data is converted into an analog audio signal by the DA converter 56, and then output from the analog audio output terminal T3 to the television receiver 14.
The audio data decoded by the audio decoder 54 is transmitted to the optical digital output interface 59.
Sent to

The setting of the carrier frequency of the received signal is performed based on the channel setting signal input from the remote controller 64 by the viewer. When a program of a desired channel is set, the reception frequency of the tuner 51 is set to a predetermined carrier frequency by referring to an NIT (Network Information Table). Then, a PAT (Program Asso
PMT (Program MapTable) which is information on the desired channel by referring to the packet in the ciation table)
Is extracted. By referring to this PMT, the PID of the video, audio, and additional data packet of the desired channel can be obtained.

Further, if there is a sub-channel related to this channel in the PMT, the PMT of this sub-channel can be described. PMT for this subchannel
Is described, the PM of this subchannel is
The PID packet of T is extracted, and the PID of the data packet of the desired subchannel is obtained by referring to the PMT of this subchannel.

GUI data such as still images such as CD jackets and lyrics and artist information are transmitted based on the MHEG5 system. For mono-media such as still images and audio, MHEG5 content is created together with a script indicating a display procedure (file information, link information, time information, event) and the like. The created content is D
It is transmitted in the format of SM-CC.

On the screen shown in FIG. 2, a music list 21B is displayed.
When the user selects a song and listens to the audio data of the song, the audio data of the selected song is extracted by the transport IC 53, decoded by the MPEG audio decoder 54, and subjected to digital / analog conversion by the DA converter 56. After the switch S
The signal is output from the analog audio output terminal T3 to the television receiver 14 through W1.

At this time, the viewer uses the remote control 64 to
When the various operations described above are performed, the operation is sent from the man-machine interface 61 to the control CPU 58. Control CPU5
8 processes the GUI data according to the operation of the viewer.

For example, when the lyrics button 22 is pressed, the text data of the lyrics transmitted as the additional data is supplied to the MPEG video decoder 55. Then, the data is converted into image data using an OSD (On Screen Display) function, converted into a composite video signal by the NTSC conversion block 57, and output from the analog video output terminal T2 to the television receiver. Thereby, at the same time as the sound of the music is played from the speaker of the television receiver 14, the lyrics are displayed in the text display area 21C of the screen in synchronization with the sound.

When the download button 28 is pressed on the screen shown in FIG. 2 and the audio data of the music is downloaded, the sub-channel corresponding to the download button 28 is set. P of this main channel
With reference to the MT, a PID for extracting the PMT of the specified sub-channel is specified. Then, the MPE sent on the sub-channel from the sub-channel PMT
The PID of audio compressed by the G method, audio data compressed by ATRAC, and additional data is specified.

Referring to the PID of this sub-channel,
From the transport IC 53, audio data compressed by the MPEG system, audio data compressed by ATRAC, and additional data are extracted.

The IEEE 1394 interface 60
When an IEEE 1394-compatible storage device is connected, the transport IC 53 selects the quadruple-speed ATRAC data and sends it out to the storage device via the IEEE 1394 interface 60 as it is.

The optical digital output interface 59 has I
When an EC958-compatible device is connected, MPEG audio data is selected by the transport IC 53, decoded by the MPEG audio decoder 54, and transmitted to the storage device via the optical digital output interface 59. When a storage device is connected to the analog audio output terminal T4, MPEG audio data is selected, decoded by the MPEG audio decoder 54, converted into an analog signal by the DA converter 56, and transmitted to the storage device. .

As shown in FIG. 4, as data for the GUI, files F1, F11, F21 for display and files F2, F12, F22 for download are sent. The display files F1, F11, and F21 are subsets of the teletext multiplex code in the case of text data, are JPEG images in the case of still images, and have a screen size in the jacket display area 21D (FIG. 2). It is small enough to fit. The download files F2, F12, and F22 are ASCII codes or music shift JIS codes. In the case of a still image, the file is a JPEG image and is large enough to be displayed on a full screen.

As shown in FIG. 4, information such as the character code type is provided in the header added to the file. By looking at this header, whether the file is a file for display or a file for download is determined. Can be identified. If the file is a display file, it is developed by the CPU 58 and is superimposed and displayed on the main video. If it is a file for download, it is sent to the storage device 13 (eg, MD recorder / player). In this case, IEEE 1394
With the use of the interface, text data and still image data can be sent to the storage device 13 as they are.

FIG. 8 is a flowchart showing the processing at this time. As shown in FIG. 8, data of the content of the MHEG script is received (step S1), and a TS packet is cut out from the section data (step S2). A data block is cut out from the TS packet (step S3), and the data blocks are combined (step S4). Then, the file header is checked (step S5). From this file header, it is determined whether this file is for display (step S6).
If the file is for display, it is used for screen display (step S7).

If the file is not for display, it is determined whether or not it is for download (step S8). If it is a file for download, it is sent to the connected storage device (step S9). If it is a file for download, it is taken in as a file to be used at the time of another script (step S10).

[0082]

According to the present invention, as additional data,
Display data and download data having the same contents but different display formats are sent. That is, the same text data is transmitted in two formats, that is, text data of a subset of the teletext multiplex code for screen display and text data of ASCII code or music shift JIS code for download. Also, as for still images, two sizes are formed: a small image size for display and a large image size for download. For this reason, additional data can be directly displayed or sent to a storage device, and format conversion is not required.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an example of a music content distribution system to which the present invention has been applied.

FIG. 2 is a diagram illustrating an example of a screen displayed on a television receiver in the system illustrated in FIG. 1;

FIG. 3 is a block diagram illustrating an example of a configuration on a transmission side in the system illustrated in FIG. 1;

FIG. 4 is a diagram showing a structure of an example of a file transmitted in the system shown in FIG. 1;

FIG. 5 is a diagram showing a structure of an example of data transmitted in the system shown in FIG. 1;

FIG. 6 is an explanatory diagram showing a connection relationship between an IRD and a storage device in the system shown in FIG. 1;

FIG. 7 is a block diagram showing an example of an IRD configuration in the system shown in FIG. 1;

FIG. 8 is a flowchart used to explain detection of a file at the time of reception.

[Explanation of symbols]

3 ... receiving equipment, 12 ... IRD, 13 ... storage device, 14 ... television receiver,

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) H04N 5/44 H04N 5/93 G 5/93 F term (reference) 5B089 HA12 JA10 JB01 JB03 JB05 JB23 KA04 KA10 KC37 KC47 KE02 KE03 LB14 LB25 5C025 CA02 CA09 CA16 CB10 DA01 DA05 5C053 FA07 FA20 FA23 JA01 JA16 JA30 LA20 5C063 AA20 AB03 AB05 AC01 AC02 AC05 AC10 CA12 CA23 CA40

Claims (7)

[Claims] 1. A data transmission method for transmitting additional data together with video data and audio data, wherein the transmitting side converts display data and download data having the same contents but different display formats from each other. It is generated as additional data, transmitted with the identification data indicating the display format added to the additional data, and the receiving side determines whether the additional data received from the identification data is display data or download data. A data transmission method in which data for display is displayed, and data for download is transferred to a storage device. 2. The data transmission method according to claim 1, wherein the additional data is text data. 3. The data transmission method according to claim 1, wherein the additional data is still image data. 4. A data transmission method for transmitting additional data together with video data and audio data, wherein display data and download data having the same contents but different display formats are generated as additional data. And a means for transmitting the additional data by adding identification data indicating the display format to the additional data. 5. The data transmitting apparatus according to claim 4, wherein the additional data is text data. 6. The data transmitting apparatus according to claim 4, wherein the additional data is still image data. 7. A data receiving apparatus for receiving video data and audio data and receiving additional data, wherein the additional data includes display data and download data having the same contents but different display formats. Means for determining whether the additional data received from the identification data is data for display or data for download, and data for display, the identification data indicating the display format being added to the additional data. And a means for displaying if the data is to be downloaded and transferring the downloaded data to a storage device.