JP3085929B2 - Data sending device and receiving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device for transmitting and receiving a data file and a data receiving device, and more particularly, to a data transmission device for transmitting a program table (EPG) data file and a program table (EPG) data. The present invention relates to a data receiving apparatus that receives a file and displays a program guide on a screen.

[0002]

2. Description of the Related Art Along with the fact that a large amount of information can be transmitted by digital broadcasting, the number of channels of a program has been increased and an electronic program guide (Electronic Program Guide) has been developed.
e: EPG) is increasing. Program information (EPG information) of an electronic program guide broadcasted by general terrestrial waves
Is a vertical blanking interval (VB) of a television broadcast such as a text multiplex broadcast from a broadcast station.
I) and sent as a text file. The receiver receives the EPG information, stores it in the storage device, and displays it on the display device as a program guide (EPG) when all the EPG information on the program for a certain period is received. As described above, by broadcasting the EPG information using the VBI, data can be simultaneously transmitted to an unspecified number of users.

[0003]

However, when the contents described in the program guide (EPG) become abundant or the number of transmitting stations increases, the number of EPG information files increases, so that the file is broadcast. There is a problem that the time for broadcasting from the station becomes longer, and the receiving side also takes longer to receive.
In addition, since a normal text file is received, secondary use is easily possible, and there is also a problem that it is difficult to protect the content of EPG information.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. In a data broadcast using terrestrial VBI, compression and encryption are performed on both a broadcasting station side and a receiver side.
By adopting archived files, EP
An object of the present invention is to provide a data transmitting device and a data receiving device capable of shortening the time for transmitting and receiving data such as G information and protecting data contents such as EPG information.

[0005]

In order to solve the above-mentioned problems, a data transmitting apparatus according to the present invention (claim 1) provides a terrestrial data broadcast with a television or a television broadcast from one or a plurality of broadcast stations. Radio program guide (Elect
(Tronic Program Guide: EPG)
In a data transmitting apparatus for transmitting a data file having a different file type depending on whether or not the information is text information, a broadcast station and a file type are determined for the data file, and compression is performed according to the broadcast station. Compress and encrypt only data files of required file types
Performs processing, compression some or all unnecessary
And file compression encryption means for encrypting the file type of the data file, the compressed encrypted data files in the file compression encryption means, and archive file creating means to archive files archived for each of the file types, And transmitting data for each archive file created by the archive file creation means.

According to a second aspect of the present invention, there is provided a data transmitting apparatus according to the first aspect, wherein the archive file creating means is provided to one broadcasting station.
Archiving data files by
Is what you do.

[0007] In the data receiving apparatus according to the present invention (claim 3), in terrestrial data broadcasting, a television or radio program guide (Electronic Program Gu) broadcasted from one or more broadcasting stations.
ide: EPG) Whether the information is text information
Therefore, the data file having a different file type is compressed according to the broadcasting station and the file type, or is not subjected to the compression process, is encrypted, and is archived for each file type and transmitted. A data receiving device that receives and displays data on a display device, and converts the received archive file into one or more data files based on accumulation control data describing a broadcast station that can be received by the data receiving device. Decompose,
A de-archiving means for storing only data files of receivable broadcasting stations among the data files, and a predetermined decryption method for the requested data file when a user's data display request is input from outside.・
And a decryption file decompression means for deciphering and decompressing based on the decompression code.

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Embodiment 1 FIG. FIG. 1 is a block diagram showing the configuration of the data transmission device according to the first embodiment of the present invention. In the figure, reference numeral 100 denotes an original data creation unit, which receives a program guide (Electronic P) of a program broadcast from each external broadcasting station at the broadcasting station.
Program guide (EPG) information is input, and a data file describing these program guide (EPG) information is created. Reference numeral 101 denotes a file type determination unit that determines the file type of the created data file. Reference numeral 102 denotes a broadcast station determination unit,
Based on the file name, a broadcast station that has provided program guide (EPG) information described in the data file is determined, and a code used for compression encryption is selected. A station compression code search unit 103 selects a compression program of the compression code selected by the broadcast station determination unit 102 based on a compression program for each station stored in advance. A station encryption code search unit 104 selects an encryption program of the encryption code selected by the broadcast station determination unit 102 based on an encryption program for each station stored in advance.
Reference numeral 105 denotes a file compression unit, and the file type determination unit 1
The file is compressed according to the file type determined at 01 and the compression program selected by the station compression code search unit 103. Reference numeral 106 denotes a file encryption unit, which encrypts the compressed file according to its file type and the encryption program selected by the station encryption code search unit 104. Reference numeral 107 denotes a header information adding unit that adds information such as the file name, file size, compression method, and encryption method of the file to the compressed and encrypted file as header information. Reference numeral 108 denotes a file compression / encryption unit, which includes a file type determination unit 101, a broadcast station determination unit 102, a station compression code search unit 103, a station encryption code search unit 104, a file compression unit 105, a file encryption unit 106, and a header. The information adding unit 107 is configured.

Reference numeral 109 denotes a compressed / encrypted file holding unit which temporarily stores the file created by the file compression / encryption unit 108. 110 is a file classification unit,
Classify and output the compressed and encrypted files for each file of the same type. A data archive creating unit 111 creates an archive file in which files of the same type are archived. An archive file storage unit 112 stores the archive file created by the data archive creation unit 111. Reference numeral 113 denotes an archive file creating unit, which stores the compressed and encrypted file
9, file classification unit 110, data archive creation unit 1
11 and an archive file storage unit 112. A data broadcasting unit 114 broadcasts the archive files stored in the archive file storage unit 112 according to a broadcast schedule.

FIG. 2 is a diagram showing an example of a data file created by the original data creating section of FIG. As shown in the figure, program guide (EPG) information about a program broadcasted on each day by each broadcasting station is described for each of the program basic information, the program additional information, the program basic image information, and the program additional image information. Types of data files have been created. The program basic information is EPG text information described in a list of TV programs or radio programs such as newspapers and television information magazines, and the program additional information is detailed information described outside the list. EPG text information such as program contents. Further, the program basic image information is EPG text information which is a supplementary EPG text information and is an image information accompanying the program, which is created by extracting highlights from the image of the program and which simply shows the program contents. And the program-added image information is EPG image information related to the program contents. Also,
Each data file is given a file name consisting of eight characters and an extension. The upper four characters of the numeral are the broadcast station identification number assigned in advance for each broadcast station, and the lower four characters are the broadcast date. Indicates the data file in which of the four types of information the extension is described. Further, the extension indicates not only the data file of the four types of information but also text data or binary data. That is, the extension of the file of the program basic information and the program additional information is set to “tt_” to indicate that the file is text data, and the file of the program basic image information and the program additional image information is “gg”.
_ ”Is set to indicate binary data.

Since the program additional information and the program additional image information are not essential information for displaying a program guide (EPG), they may not be created depending on a program or a broadcasting station. The types of information are not limited to the above four types. Therefore, the number of data files to be created may differ depending on the broadcasting station.

Next, the operation of the data transmitting apparatus according to the first embodiment of the present invention will be described with reference to FIGS. First, from a broadcasting station, EPG text information such as start time and end time, performer name, broadcast channel, broadcast station name, etc. of a TV program or a radio program broadcasted by the broadcast station, EPG image information accompanying the program, EPG Voice information and the like are input to the original data creation unit 100, and four types of data files shown in FIG. 2 are created in which the information is described and file names are given.

Next, in the file type determination unit 101,
For the data file created by the original data creation unit 100, the file type is determined based on the extension of the file name, and the result is output. For example, the extension “gg2” indicates that the file type is the program additional image information.

On the other hand, the broadcast station determining section 102 determines the broadcast station which has provided the information described in the file from the file name of the data file created by the original data creating section 100, and outputs it. For example, if the file name is “00020422. gg2 ", it can be seen that the information is for the B station.

Next, the station compression code search section 103 selects and outputs the compression program of the broadcasting station determined by the broadcasting station determination section 102 from the compression programs (compression codes) for each station stored in advance. The compression program may be instructed by each station, or may be assigned to the data transmission device for each station.

Next, the file compression section 105 receives the file whose file type has been determined from the file type determination section 101 and the compression program from the station compression code search section 103, and based on the file type, Output without compression or compression. For example, if the file type is an extension "tt1" or "tt2", the file is a text file. Therefore, the text file is compressed by the compression program. If the file type is "gg1" or "gg2", a binary file is used. Therefore, output is performed without performing compression processing. That is, since the well-known LZ77 system is adopted as a compression algorithm, its compression efficiency is high for text data, but binary data cannot be compressed as efficiently as text data. Further, there is also a fact that since the general-purpose image file format deals with compressed data, there is almost no effect of further compression. Therefore, the above file is processed according to the file type, and compression processing is performed for a text file, and compression is not performed for a binary file. Therefore, the uncompressed file from which the compression processing has been omitted is subsequently output to the file encryption unit 106 and encrypted, so that the efficiency of the file compression processing can be increased.

Next, the station encryption code search unit 104
A broadcast station encryption program determined by the broadcast station determination unit 102 is selected from the previously stored encryption programs (encryption codes) for each station and output. In addition, as the encryption method, a known DES (Data Encryption Stan
dard) Known encryption algorithms such as encryption and exclusive OR are available. Also, the encryption program may be instructed by each station, or may be assigned to each station by the data transmission device.
Next, the file encryption unit 106 sets the file compression unit 1
In response to the compressed file from step 05 and the encryption program from the station encryption code search unit 104, the file is encrypted by the encryption program.

Here, the compressed file becomes binary data, which makes it impossible to browse information with a normal text editor or the like. However, since the compression algorithm itself employs a known algorithm, it can be relatively easily converted into a text file. It can be returned, and a problem arises when content protection is desired. In addition, since the binary file of the image information is not subjected to the compression processing, secondary use of the broadcast file is easily possible, and there is a problem that the content cannot be protected. Therefore, the content of the compressed data can be protected by further encrypting the compressed data.

The reason why the data is compressed by the file compression unit 105 and then encrypted by the file encryption unit 106 is that the text file is smaller than the encrypted random data file due to the characteristics of the compression algorithm. Next, the header information adding unit 107 adds the file name, file size, compression method, encryption method, and the like of the file to the compressed and encrypted file from the file encryption unit 106. Information is added as header information and output. As information on the compression method, an identification number or the like is added to a compression program preset in the station compression code search unit 103, and the identification number of the selected compression program is used. Similarly, as the information on the encryption method, an identification number or the like is added to the encryption program preset in the station encryption code search unit 104, and the identification number of the selected encryption program is used.

As described above, the file type determining unit 1
01, broadcast station determination section 102, station compression code search section 10
3, station encryption code search unit 104, file compression unit 10
5. File encryption unit 106 and header information addition unit 1
07, a compressed encrypted file is created and output.

Next, the compressed / encrypted file holding unit 109
Temporarily stores the file created by the file compression / encryption unit 108. Next, the file classifying unit 110 classifies and outputs the compressed encrypted files temporarily stored in the compressed encrypted file holding unit 109 for each file of the same type. For example, files having the extensions “tt1”, “tt2”, and “gg2” are classified into file types 1, 2, and n, respectively.

Next, the data archive creating section 111
Is, from the files classified by the file classification unit 110,
Create an archive file for each file of the same type. For example, the data archive creator 111 to which the file of the file type 1 is input includes a plurality of files having the extension “tt1”, that is, data of the program basic information on April 22, such as the stations A, B, and X. The data archive creator 111 that archives the file and receives a file of the file type n receives a plurality of files having the extension “gg2”, that is, the program addition on April 22, such as the A station, the B station, and the X station. Archive image information. Therefore, an archive file is created for each broadcast date from the same type of files of a plurality of broadcast stations. In addition, the file type (file name) of each archived file is added to the header of the archive file based on the header information added by the header information adding unit 107.
File information such as file capacity, compression method, and encryption method is stored. Next, the archive file storage unit 1
Reference numeral 12 stores the archive file created by the data archive creating unit 111.

As described above, the archive file is created by the archive file creation unit 113 including the compressed and encrypted file holding unit 109, the file classification unit 110, the data archive creation unit 111, and the archive file storage unit 112. Next, the data broadcasting unit 114
The archive file created by the archive file creation unit 113 is broadcast according to a broadcast schedule.

As described above, the data transmitting apparatus according to the first embodiment of the present invention compresses and encrypts a data file broadcast in a data broadcast by the file compression / encryption unit, and creates an archive file of the compressed and encrypted data file. Since the data is archived and transmitted by the section, the compression efficiency can be kept high.

The file compression / encryption unit compresses the data file according to its file type.
Alternatively, since the data file processed by the above-mentioned archive file creation unit is archived for each of the above-mentioned file types without performing compression processing, files that do not require compression processing are excluded from processing targets. And the processing of the transmission file can be made more efficient.

In the data file, program guide (EPG) information of a plurality of broadcasting stations is described for each broadcasting station.
Since the file type is made different depending on the program guide (EPG) information to be described, it is possible to archive the file of each broadcasting station for each program guide (EPG) information and send it as a coherent archive file. it can.

The file compression / encryption means compresses only data files of a file type which needs to be compressed in accordance with the broadcasting station of the data file, encrypts all data files, and encodes the archive file. The creation means archives the processed data files for each of the above file types, so that the transmission time of the program guide (EPG) data can be shortened and files that do not require compression processing are processed. From the file, and the processing of the transmission file can be made more efficient.

In the first embodiment of the present invention,
Although a case has been described where an archive file is created by compressing, encrypting and archiving program guide (EPG) data, a similar effect can be obtained by creating an archive file for a data file of a data broadcast as well.

Embodiment 2 FIG. 3 is a block diagram showing a configuration of the data receiving device according to the second embodiment of the present invention. In the figure, a data receiving unit 200 receives an archive file of program guide (EPG) data transmitted in the first embodiment and a data broadcast content including a data program file. Reference numeral 201 denotes a storage control data storage unit, which stores storage control data describing the identification number of a receivable broadcast station among the files of each station constituting the received archive file. Reference numeral 202 denotes an archive file storage determination unit, and a data reception unit 200 according to the storage control data of the storage control data storage unit 201.
Among the files of each station constituting the archive file received in step 1, the receivable broadcast station file is determined. 2
Reference numeral 03 denotes an archive file decomposing unit which decomposes the archive file from the archive file storage determination unit 202 for which the required file has been determined, extracts the necessary file, and stores the storage control data in the storage control data storage unit 201. By referring to the file, unnecessary files that cannot be processed by the data receiving device are discarded. Reference numeral 204 denotes a compressed / encrypted file storage unit which assigns the file name of the header information to a specific directory based on the header information of the compressed / encrypted file, based on the header information of the compressed / encrypted file. And accumulate. Reference numeral 205 denotes an information display instructing unit which instructs a file which is externally input and which the user desires to view. Reference numeral 206 denotes a decryption file decompression unit which, when instructed by the information display instruction unit 205, encrypts the designated compressed encrypted file among the compressed encrypted files stored in the compressed encrypted file storage unit 204. Uncompress and expand the file. 2
Reference numeral 07 denotes a decryption / decompression code selection unit, which compresses and encrypts header information of a compressed encrypted file decrypted and decompressed by the decryption file decompression unit 206 from a plurality of preset decryption programs and decompression programs. Is selected and output. 208
Denotes an information display unit, and an encrypted decryption file decompression unit 206
To display the decrypted and decompressed file.

Next, the operation of the data receiving apparatus according to the second embodiment of the present invention will be described with reference to FIG. First, when an archive file broadcast from the data transmitting apparatus described in the first embodiment reaches the data receiving unit 200, a known means capable of extracting data superimposed on the VBI represented by a text multiplex broadcast receiver. The data receiving unit 200 configured as described above extracts and outputs an archive file from the data superimposed on the VBI of the received radio wave. Reconstruction of an archive file from the data is based on the ARI standard ARI, which is a standard for data broadcasting using VBI.
This is performed based on B-ST05.

Next, the archive file accumulation judgment section 2
02, based on the storage control data preset in the storage control data storage unit 201 and the header information of the archive file from the files of each station constituting the archive file received by the data receiving unit 200.
The necessary files of the receivable broadcasting station are determined. That is, the program guide (EPG) data is basically created collectively for TV programs and radio programs broadcast in local units such as the Kanto region and the Kansai region, and is transmitted according to the receiving side. Some broadcasting stations cannot be received depending on the location. Therefore, storage control data A describing the identification number of a receivable broadcasting station is set in advance according to the place where the data receiving device is used.

Further, in order to cope with a case where a new broadcasting station is established, storage control data B describing identification numbers of all broadcasting stations described in the transmitted program guide (EPG) data is also stored. deep. That is, if the number of broadcast stations increases, the number of broadcast stations described in the program guide (EPG) data transmitted at that time also increases. Can be determined to be a broadcasting station. In this case, it is needless to say that the broadcast station of the accumulation control data B needs to be updated. Further, the user determines whether or not the newly installed broadcasting station can receive the data by the data receiving device. If the data can be received, the accumulation control data A needs to be updated by an external input. .

Next, the archive file decomposing unit 203
Decomposes an archive file from the archive file storage determination unit 202 for which a necessary file has been determined based on the result of analyzing the header information of the archive file, extracts a necessary compressed and encrypted file, and performs storage control. With reference to the accumulation control data in the data storage unit 201, unnecessary files that cannot be processed by the data receiving device among the extracted files are discarded. For example, if the data receiving device does not have an image display function, the image archive file is discarded. Therefore, the storage control data also includes the storage control data C describing the file types that can be processed by the data receiving device.

Next, the compressed and encrypted file storage unit 204
Stores the compressed and encrypted file extracted by the archive file decomposing unit 203 in a specific directory with the file name of the header information, based on the header information of the compressed and encrypted file.

Next, when the user inputs a file to be viewed from outside into the information display instruction unit 205, the information display instruction unit 205 outputs an instruction to display the file. For example, if the user desires and inputs a display of a program table including program basic image information on April 22 of all broadcasting stations,
The information display instructing unit 205 stores the file name “00001042”.
2. gg1 ”,“ 00020422. gg1 ”,“ 00
070422. gg1 ”or the like.

Next, the decryption file decompression unit 206
Receives the instruction from the information display instruction unit 205, extracts the specified compressed encrypted file from the compressed encrypted files stored in the compressed encrypted file storage unit 204,
The compression method and the encryption method of the compressed encrypted file are output to the decryption / decompression code selection unit 207.

Next, the decryption / decompression code selection unit 207
Selects a program corresponding to the compression method (identification number of the compression program) and the encryption method (identification number of the encryption program) from the decryption file decompression unit 206 from a preset decryption program and decompression program. Output. That is, the decryption / decompression code selection unit 20
7, a decryption program and a decompression program corresponding to the set compression program and encryption program are set in the station compression code search unit 103 and the station encryption code search unit 104 of the data transmission device, respectively. Have the same identification numbers. Therefore, the decryption / decompression code selection unit 207 selects the decompression program having the same identification number as that of the compression program.
And a decryption program having the same identification number as that of the encryption program is selected and output.

Here, as shown in the first embodiment, the station compression code search section 103 and the station encryption code search section 104 of the data transmitting apparatus are compressed and encrypted for each broadcasting station, respectively. A broadcasting station that wants to charge for the program guide (EPG) data has a decoding / decompression code selection unit 20.
7. For each broadcasting station, for example, by providing a special decryption and decompression program to a user who has consented to charging without providing a normally usable decryption and decompression program, for example, by providing a special decryption and decompression program using a floppy disk or card key, etc. EP
It is also possible to operate G broadcast.

Next, the decryption file decompression unit 206
Decrypts the extracted compressed and encrypted file based on the decryption program and the decompression program selected by the decryption / decompression code selection unit 207, and then performs file decompression. Next, the information display unit 208 displays a program table composed of data decrypted and decompressed by the decryption file decompression unit 206, and provides the user with browsing.

As described above, the data receiving apparatus according to the second embodiment of the present invention receives a broadcast archive file by compressing, encrypting and archiving a data file in terrestrial data broadcasting. The archive file received by the de-archiving means is decomposed into one or more data files. When a user's data display request is input from outside, the decryption file decompression means sets the requested data file in advance. The decoding and decompression are performed based on the decoded / decompressed code, so that the data reception time can be shortened and energy savings can be realized. In addition, when the data display is instructed, the data is compressed. Decryption of encrypted data files, decompression and display of data to protect data contents Possible it is.

Further, the de-archiving means determines a data file that can be used by the data receiving apparatus among the received archive files based on the storage control data set in advance, and stores the data. A memory can be secured without storing data that cannot be displayed.

In the data file, program guide (EPG) information of a plurality of broadcasting stations is described for each broadcasting station.
The file type is different according to the described program table (EPG) information, and the file type is compressed and encrypted according to the broadcasting station and the file type, archived for each file type, and transmitted. As a result, it is possible to shorten the reception time of program guide (EPG) data and realize energy saving, and to provide an encryption / compression means for each broadcasting station to charge each station. It is possible to operate the EPG broadcast, for example.

Further, the de-archiving means stores only the data files of the receivable broadcasting stations among the data files constituting the received archive file based on the storage control data. The memory can be effectively used without storing program guide (EPG) data relating to a John program or the like.

[0050]

As described above, according to the data transmitting apparatus of the present invention (claim 1), the data file broadcast by the data broadcast is compressed and encrypted by the file compression / encryption unit, and the data file is compressed and encrypted. Since the data file is archived and transmitted by the archive file creation unit, the data transmission time can be shortened.

The data file includes a plurality of broadcasting stations.
Program guide (EPG) information is described for each broadcast station, and the description
File type differs depending on the program guide (EPG) information
, So each program guide (EPG) information
Archive broadcast station files for cohesion
There is an effect that the file can be transmitted as an archive file .

Further, the file compression / encryption means
Files that need to be compressed according to the broadcasting station of the data file
Only the data files of the file type
The data file is encrypted, in the archive file creating means, the processed data files, because I shall archived for each of the file types, program guide
(EPG) In addition to shortening the data transmission time, files that do not require compression processing can be excluded from processing targets, and the processing of transmission files can be made more efficient.

According to the data transmitting apparatus of the present invention (claim 2) , in the data transmitting apparatus of claim 1, the archive file creating means is provided in one broadcasting station.
Whether data files are archived
For example, the text in the data transmitted by one broadcasting station
Archive of files that are required for EPG
File and archive file of data that is not
Has the effect of being able to create both at the same time .

Data receiving device according to the present invention (claim 3)
In terrestrial data broadcasting, data
Files are compressed, encrypted, archived and broadcast
Received the archive file,
One or more data files can be
User data display requests are input from outside.
When decrypted, the decrypted file decompression means
Data files, decryption and expansion
Because it was deciphered and decompressed based on the long code,
Data reception time can be shortened, saving energy
And the display of data is instructed.
Decrypts compressed and encrypted data files when
Read and expand the file to display the data
This has the effect of enabling content protection .

The data file includes a plurality of broadcasting stations.
Program guide (EPG) information is described for each broadcast station, and
File type according to the described program guide (EPG) information
The broadcasting station and the file type
Compressed and encrypted according to file type
The program was archived and sent to
Table (EPG) data reception time can be shortened
Energy saving and EP for each station
There is an effect that the operation of the G broadcast can be performed.

Further, the de-archiving means performs storage control.
Configure received archive files based on data
Of the receivable broadcast stations in the data file
Cannot receive because only files are stored
Program guide (EPG) data related to television programs, etc.
There is an effect that the memory can be effectively used without storing .

[0057]

[0058]

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a data transmission device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a data file created by an original data creation unit in FIG. 1;

FIG. 3 is a block diagram showing a configuration of a data receiving device according to a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Original data creation unit 101 File type determination unit 102 Broadcast station determination unit 103 Station compression code search unit 104 Station encryption code search unit 105 File compression unit 106 File encryption unit 107 Header information addition unit 108 File compression encryption unit 109 Compression Encrypted file storage unit 110 File classification unit 111 Data archive creation unit 112 Archive file storage unit 113 Archive file creation unit 114 Data broadcast unit 200 Data reception unit 201 Storage control data storage unit 202 Archive file storage determination unit 203 Archive file decomposition unit 204 Compressed / encrypted file storage unit 205 Information display instruction unit 206 Decryption file decompression unit 207 Decryption / decompression code selection unit 208 Information display unit

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Shinya Kusuhara 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-house (56) References Special Table Hei 8-511140 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04N ^7/ 025-7/088 H04N 5/44-5/45 H04H 1/00

Claims (3)

(57) [Claims] 1. In terrestrial data broadcasting, a television or radio program guide (Electronic Program Gu) broadcasted from one or more broadcasting stations.
ide: EPG) Whether the information is text information
Therefore, in a data transmitting apparatus for transmitting a data file having a different file type, a broadcast station and a file type are determined for the data file, and only a data file of a file type that needs to be compressed is compressed according to the broadcast station. And perform encryption processing .
With cormorants, some compression is not required or all of the files species
And file compression encryption means for encrypting the data file of the kind, the compressed encrypted data files in the file compression encryption means, and archive file creating means to archive files archived for each of the file types, the A data transmission device for transmitting data for each archive file created by the archive file creation means. 2. The data transmitting apparatus according to claim 1, wherein
Te, said archive file creation means, features and to Lud <br/> over data delivery device to archive the data file according to one broadcasting station. 3. In terrestrial data broadcasting, a television or radio program table (Electronic Program G) broadcasted from one or more broadcasting stations.
uide: EPG) Whether the information is text information
A data file having a different file type is compressed by the broadcast station and the file type,
Alternatively, the data receiving apparatus receives an archive file which is not compressed, encrypted, archived and transmitted for each file type, and displays data on a display device. A de-archiving method that decomposes a received archive file into one or more data files based on storage control data describing possible broadcast stations and stores only data files of receivable broadcast stations among the data files. And a decryption file decompression means for deciphering and decompressing the requested data file based on a predetermined decompression / decompression code when a user data display request is input from outside. A data receiving device.