JPH10256998A - Method and device for transmission/reception of service information and reception equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage of the transmission capacity of a broadcasting wave at the time of giving a reception permission code, which individually sets reception terminals to the reception allowable state and to suppress the rise of the terminal cost in a system which uses the limited broadcast of FM teletext broadcasting to provide service information. SOLUTION: On the enterpriser side like an FM broadcast station U0, terminal- peculiar information like a production number is stored in a user file 11, and a processing circuit 12 adds an error detection code to reception permission information, which indicates a period of reception permission and contents of a contract, and enciphers this information by terminal-peculiar information and transmission information, which is periodically changed and can be generally used, like date information and reports it to a user by mail or the like. On the side of each of reception terminals U1 to U3, a processing circuit 33 uses terminalpeculiar information stored in a memory M3 and received transmission information to perform decoding of the reception permission code and error correction when the reported reception permission code is inputted from an input device 35, and reception of the limited broadcasts is permitted if decoded reception permission information indicates reception permission and has no errors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to FM (Frequency Modulation) text multiplex broadcasting which provides service information by using a gap between broadcast waves, as a limited broadcast capable of providing information only to specific users. The present invention relates to a method and an apparatus for transmitting and receiving service information which are preferably implemented, and a receiving apparatus.

[0002]

2. Description of the Related Art Conventionally, as described above, service information has been widely multiplexed and transmitted in the gap between broadcast waves. In recent years, in particular, in recent years, a program being broadcast using FM broadcast waves has been widely used. A service that provides information about the information and other information such as news and weather is spreading as a so-called visible radio.

[0003] In the FM text multiplex broadcasting, broadly speaking, if a compatible receiving terminal is purchased, a free broadcast such as the news and weather forecast in which information can be used, and a dedicated receiving terminal are purchased. It is classified as a paid limited broadcast that can be used only by the user who paid the reception fee.

[0004] The service information provided by the FM teletext broadcasting is provided with a service identification. In a general radio receiver used as the visible radio, only the service information whose service identification is free broadcasting is provided. The service information is decoded so as to display characters, and the remaining service information of the service identification of the limited broadcast is not taken in. On the other hand, the limited broadcast receiving terminal decodes the service information of the service identification that can be supported, and is configured to be able to display characters, and is configured to be able to display the free broadcast service information in characters. Sometimes.

[0005] In such limited broadcasting, not only the purchase of a dedicated receiving terminal but also the charging of a user and the payment of the receiving fee as described above, and the service is provided only to the user who has concluded the receiving contract. It is necessary to make information available.

In this regard, in VICS (road traffic information communication system), which has already started to be used for limited broadcasting of FM teletext, a receiving contract fee is added in advance to the receiving terminal, that is, the vehicle price of a car navigation system. After the purchase, the user can continue receiving.

However, in such a billing method,
The receivable period depends on the use period of the receiving terminal or the product life, and the use period and the length of the product life may cause inequality between users, or the quality of the receiving terminal may be improved and the product life may be shortened. There is a problem that the longer the is, the less the replacement demand is, and the reception fee income is reduced. Furthermore, there is a problem that it is not possible to cope with a case where service contents are different for each user instead of providing uniform service information to all users.

[0008] Therefore, in order for only the user who has properly paid the reception fee to be able to receive the service information corresponding to the reception fee for each predetermined period, in order for the user to be able to receive the service information for each predetermined period, Alternatively, it is necessary to set the receivable service content and the receivable period for each receiving terminal.

As a typical prior art capable of responding to such a request, for example, Japanese Patent Application Laid-Open No. H8-14902
7 and JP-A-8-186549. According to Japanese Patent Application Laid-Open No. 8-149,027, when a user pays a reception fee through a financial institution, a limited broadcaster such as an FM broadcasting station can obtain an individual ID code unique to the user and a pay service information. A pay ID code, which is password information for enabling reception, is multiplexed in a broadcast wave and transmitted. When each receiving terminal detects an individual ID code that matches its own ID code, it receives the individual ID code. The pay ID code following the code is fetched, and the receiving terminal
After confirming that the code is set, the transmitted service information is displayed in characters.

[0010] Further, in Japanese Patent Application Laid-Open No. Hei 8-186549, a user purchases an IC card for which payment is prepaid, and inserts it into a receiving terminal, whereby the validity period and service contents stored in the IC card are determined. The service information is configured to be able to be displayed in characters in accordance with the reception control information.

[0011]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 8-149 is disclosed.
In No. 027, the reception permission code is transmitted from the broadcast station side in the same manner as the satellite broadcasting using the broadcasting satellites and communication satellites which are now widely spread, so that the reception terminal side decodes the reception permission code. There is a problem that a circuit is required, the structure is complicated, and the cost is increased. In addition, it is necessary to transmit a reception permission code for each receiving terminal within the limited transmission capacity of the broadcast wave, and if the number of receiving terminals exceeds a certain number, it may not be possible to respond and the program service will be enhanced. Then, the amount of information increases, and the service information is repeatedly transmitted a plurality of times in order to eliminate the influence of noise or the like. As a result, it is impossible to cope with the increase in the number of users or the service. This is because the transmission capacity is much smaller than that of the satellite broadcasting (1).
(6 kbps) FM text multiplex broadcasting is extremely remarkable. Furthermore, since the service information cannot be received unless the reception permission code has been received, the power is turned on for a predetermined time within a contract renewal unit period such as one month before actually attempting to receive the service information, that is, When the individual ID code and the pay ID code for the own station are transmitted, there is a problem that the station must be in a receiving state.

In the configuration using a prepaid card such as an IC card in the above-mentioned Japanese Patent Application Laid-Open No. 8-186549, an interface mechanism for reading and writing information from the prepaid card or the like is required on the receiving terminal side. However, there is a problem that the structure becomes complicated and the cost increases, and the power consumption also increases. In addition, the prepaid card is usually sold at a convenience store, an electronics store, and the like, and can be easily obtained, but the selling fee is transferred to the receiving fee together with the fee for creating the card itself. Is high. Furthermore, for example, Japanese Patent Application Laid-Open No. 8-256
No. 071, the memory is destroyed when a predetermined period of use elapses and the memory is destroyed. For media that can be used in common, there is a risk of forgery or falsification even if security is improved.

An object of the present invention is to set accurate reception permission information corresponding to the service content for each receiving terminal without reducing the transmission capacity of service information and increasing the cost of the receiving terminal. An object of the present invention is to provide a method and apparatus for transmitting and receiving service information and a receiving apparatus.

[0014]

According to a first aspect of the present invention, there is provided a method for transmitting and receiving service information, wherein a predetermined receiving terminal is capable of receiving service information multiplexed on a broadcast wave and transmitted from an operator. In the method, the business operator side,
Information obtained by adding a predetermined error detection code to reception permission information that permits reception of the service information, terminal-specific information specific to the reception terminal to which reception is to be permitted, changes at regular intervals, and is generally available. A reception permission code composed by synthesizing the transmission information and the reception information is created, and the reception permission code is given to each of the users of the receiving terminals that should be able to receive the limited reception. Set to the receiving terminal, the receiving terminal, terminal-specific information stored in advance,
Using the received transmission information, the set reception permission code is decoded and error detection is performed. When the decoded reception permission information indicates reception permission and there is no error, reception of the service information is performed. Is made possible.

According to the above configuration, in a service information transmission / reception method that is preferably implemented in a limited broadcast of FM text multiplex broadcasting or the like, a business side such as a broadcasting station can check the status of transfer of the reception fee of each user, , The contract details, such as whether to use only specific information or all information among a plurality of service information,
The reception permission information is created from the reception permission time limit and available service contents corresponding to the transfer situation, and an error detection code is added to the created reception permission information. Device-specific information for
The reception permission code is created by synthesizing the transmission information that changes every predetermined period such as the year and month information and the transmission information that can be generally used. The reception permission code is notified to the user by mail, personal computer communication, or the like.

On the other hand, on the receiving terminal side such as a listener, upon receiving the notification of the reception permission code, the user sets the reception permission code in the reception terminal. In response to this, the receiving terminal decodes the reception permission code using the terminal-specific information of the receiving terminal stored in advance and the received transmission information, and uses the error detection code to decode the reception permission code. When error detection is performed and the decoded reception permission information indicates reception permission and there is no error, reception of service information of the service identification corresponding to the reception permission information is enabled.

Therefore, the reception permission code is not transmitted together with the service information, ie, the FM
In the case of text multiplex broadcasting, transmission is not performed by broadcast waves, but by mail or personal computer communication, etc., and is transmitted to specific users who should be allowed to receive it. There is no. Further, the decoding of the reception permission information from the reception permission code can be performed using a microcomputer or the like that converts the service information received by the reception unit into a form usable by the user. The rise can be suppressed.

Further, the reception permission information is in a state of being encrypted by terminal-specific information and transmission information, and the terminal-specific information is created based on information that can be known by a user, such as the serial number. Therefore, even if the user tries to find it and use it illegally, the correct reception permission information cannot be decrypted by the encryption using the transmission information, and the reception of the service information is not permitted. Therefore, it is possible to accurately receive only the service information contracted with the provider for the contracted period, and to ensure high security.

If the transmission information changes, correct reception permission information cannot be set even if the terminal-specific information matches. As a result, the input validity period of the fixed period is set in the reception permission code, so that the user erroneously sets the reception permission code of the old reception permission period used once and cannot receive. It is possible not only to prevent such troubles from occurring, but also to notify the user of such troubles and to input a correct reception permission code.

[0020] The method for transmitting and receiving service information according to the second aspect of the present invention is characterized in that at least one of the reception permission information, terminal-specific information, and transmission information is encrypted.

According to the above arrangement, the user determines the terminal-specific information, decodes the reception permission information using the determined terminal-specific information, and sets the reception permission code after the expiration of the usable period. Even if it tries to set, by encrypting at least one of the terminal specific information, the transmission information, and the reception permission information, it is not possible to determine the correct reception permission code, Even if the information is created based on information that the user can know, such as the serial number, unauthorized use can be prevented.

Furthermore, the method for transmitting and receiving service information according to the invention of claim 3 is characterized in that the reception permission code is further encrypted.

According to the above construction, even if the encryption is performed as described in claim 2 and the cyclic code used for the encryption is decrypted by some detailed users, the entire reception permission code is decrypted. By using the encryption, unauthorized use can be more reliably prevented.

According to a fourth aspect of the present invention, in the method for transmitting and receiving service information, the transmission medium of the service information is a limited broadcast of a text multiplex broadcast in a frequency modulation broadcast.

According to the above arrangement, since the transmission capacity of the service information is very small in the text multiplex broadcast of the frequency modulation broadcast as compared with the satellite broadcast or the like, the method of the present invention which does not need to transmit the reception permitting code is This is extremely advantageous.

Further, the service information transmitting and receiving apparatus according to the invention of claim 5 is an apparatus for enabling a predetermined receiving terminal to receive service information multiplexed on a broadcast wave and transmitted from a carrier side. A service provider that adds an information source of service information to be transmitted and a service identification indicating that the service information can be limitedly received only to a predetermined user to the service information, and transmits the service information. A user file storing terminal-specific information unique to each user's receiving terminal and service contents that can be provided to each user, and reading the terminal-specific information and service contents stored in the user file. , Creating reception permission information corresponding to the service content, and adding the predetermined error detection code to the created reception permission information, And a reception permission code generating means for generating a reception permission code by combining the information and transmission information that changes at regular intervals and generally available, and assigning the reception permission code to each user of the receiving terminal that is to be able to perform limited reception. A receiving unit that receives the service information having the same service identification and notifies the user of the received service information; and an input unit for inputting the reception permission code by the user. Storage means for preliminarily storing terminal-specific information specific to the receiving terminal; and decoding the input reception permission code using the terminal-specific information stored in the storage means and the received transmission information. And perform error detection,
When the decrypted reception permission information indicates reception permission and there is no error, a reception permission code decoding unit that enables the reception unit to receive the service information is provided.

According to the above configuration, in a device for transmitting and receiving service information which is preferably implemented as a transmitting and receiving device for a limited broadcast of FM teletext broadcasting, a broadcaster or other business operator can store a user file in a user file. , The reception status of each user and the contract contents, for example, whether to use only specific information or all information among a plurality of service information, and the like, and receive the reception permission code. The creation means creates reception permission information from a reception permission time limit or available service content corresponding to the transfer status, and adds an error detection code to the created reception permission information. A reception permission code is created by combining terminal-specific information unique to the receiving terminal and transmission information that changes at regular intervals, such as year and month information, and is generally available. The reception permission code is notified to the user by mail, personal computer communication, or the like.

On the other hand, on the receiving terminal side such as a listener, upon receiving the notification of the reception permission code, the user inputs the reception permission code from the input means. In response,
The reception permission code decoding means decodes the reception permission code using the terminal-specific information of the reception terminal stored in the storage means in advance and the received transmission information, and uses the error detection code. When the error is detected and the decoded reception permission information indicates the reception permission and there is no error, the reception unit can receive the service information of the service identification corresponding to the reception permission information.

Therefore, the reception permission code is not transmitted together with the service information, ie, the FM
In the case of text multiplex broadcasting, transmission is not performed by broadcast waves, but by mail or personal computer communication, etc., and is transmitted to specific users who should be allowed to receive it. There is no. Further, the decoding of the reception permission information from the reception permission code can be performed using a microcomputer or the like that converts the service information received by the reception unit into a form usable by the user. The rise can be suppressed.

Further, the reception permission information is in a state of being encrypted by terminal-specific information and transmission information, and the terminal-specific information is created based on information such as the serial number which can be known by the user. Therefore, even if the user tries to find it and use it illegally, the correct reception permission information cannot be decrypted by the encryption using the transmission information, and the reception of the service information is not permitted. Therefore, it is possible to accurately receive only the service information contracted with the provider for the contracted period, and to ensure high security.

If the transmission information changes, correct reception permission information cannot be set even if the terminal-specific information matches. As a result, the input validity period of the fixed period is set in the reception permission code, so that the user erroneously sets the reception permission code of the old reception permission period used once and cannot receive. It is possible not only to prevent such troubles from occurring, but also to notify the user of such troubles and to input a correct reception permission code.

Further, in the service information transmitting / receiving apparatus according to the invention of claim 6, the service provider includes the reception permission information,
A first encryption unit for encrypting at least one of the terminal-specific information and the transmission information, wherein the receiving terminal is configured to encrypt the reception permission information and / or the terminal-specific information when the terminal-specific information is encrypted; And decrypting the transmission information and encrypting the transmission information with the first encryption unit when the transmission information is encrypted.

According to the above arrangement, the user determines the terminal-specific information, decodes the reception permission information using the determined terminal-specific information, and sets the reception permission code after the expiration of the usable period. Even if it tries to set, by encrypting at least one of the terminal specific information, the transmission information, and the reception permission information, it is not possible to determine the correct reception permission code, Even if the information is created based on information that the user can know, such as the serial number, unauthorized use can be prevented.

Further, in the service information transmitting / receiving apparatus according to the invention of claim 7, the business entity further includes a second encrypting means for encrypting the reception permission code, and the receiving terminal is configured to encrypt the reception permission code. A second decryption unit for decrypting the encrypted reception permission code.

According to the above configuration, even if encryption is performed as described in claim 6 and the cyclic code used for the encryption is decrypted by some detailed users, the entire reception permission code is decrypted. By using the encryption, unauthorized use can be more reliably prevented.

Further, in the service information transmitting / receiving apparatus according to the invention of claim 8, the transmission medium of the service information is a limited broadcast of a character multiplex broadcast in a frequency modulation broadcast.

According to the above arrangement, since the transmission capacity of the service information is very small in the text multiplex broadcasting of the frequency modulation broadcasting as compared with the satellite broadcasting or the like, the method of the present invention which does not need to transmit the reception permission code is used. This is extremely advantageous.

Further, the service information receiving apparatus according to the ninth aspect of the present invention is a service information receiving apparatus for receiving service information transmitted from a service provider, which indicates that limited reception is possible only for predetermined users. Receiving means capable of receiving service information having the same identification to notify the user, input means for inputting a reception permission code given to each user, and a unique terminal unique to a pre-assigned terminal The storage means storing information, the input reception permission code, the terminal-specific information stored in the storage means, and the received transmission information which is generally available and changes at regular intervals. Decoding using, and performing error detection, the decoded reception permission information indicates reception permission,
And a reception permission code decoding unit that enables the reception unit to receive the service information when there is no error.

According to the above arrangement, in a service information receiving apparatus preferably implemented as a limited broadcast receiving apparatus for FM text multiplex broadcasting, a reception permission code given by a business side such as a broadcasting station is used. Upon receipt by mail or personal computer communication, the user inputs the reception permission code from the input means. In response to this, the receiving permission code decoding means uses the terminal specific information of the receiving device stored in the storage means in advance and the received sending information that changes every fixed period to receive the receiving permission code. And performs error detection using the error detection code,
When the decrypted reception permission information indicates reception permission and there is no error, the reception unit can receive the service information of the service identification corresponding to the reception permission information.

Therefore, the reception permission code is not transmitted together with the service information, ie, the FM
In the case of text multiplex broadcasting, transmission is not performed by broadcast waves, but by mail or personal computer communication, etc., and is transmitted to specific users who should be allowed to receive it. There is no. Further, the decoding of the reception permission information from the reception permission code can be performed using a microcomputer or the like that converts the service information received by the reception unit into a form usable by a user. Can be suppressed.

Further, the reception permission information is in a state of being encrypted by terminal-specific information and transmission information, and the terminal-specific information is created based on information such as the serial number that can be known by the user. Therefore, even if the user tries to find it and use it illegally, the correct reception permission information cannot be decrypted by the encryption using the transmission information, and the reception of the service information is not permitted. Therefore, it is possible to accurately receive only the service information contracted with the provider for the contracted period, and to ensure high security.

If the transmission information changes, correct reception permission information cannot be set even if the terminal-specific information matches. As a result, the input validity period of the fixed period is set in the reception permission code, so that the user erroneously sets the reception permission code of the old reception permission period used once and cannot receive. It is possible not only to prevent such troubles from occurring, but also to notify the user of such troubles and to input a correct reception permission code.

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described.
The following is a description based on FIGS. 1 to 21.

FIG. 1 is a system configuration diagram of a limited broadcast of FM teletext broadcasting according to an embodiment of the present invention. In FIG. 1, reference characters U1, U2, U3,. , Service information that can be displayed and reproduced is transmitted in a multiplexed manner only at a specific receiving terminal indicated by reference numeral U).

In the FM broadcast station U0, stereo audio signals of both left and right channels, such as music and voice, from the stereo audio signal source 1 are input to the stereo modulation circuit 2, and L + R,
The transmission signal is modulated into an L-R signal, and further, in the FM modulation circuit 3, a carrier signal having a frequency unique to each FM broadcasting station U0 is frequency-modulated to generate a transmission signal. Has been sent through.

In the receiving terminal U, the carrier signal of the FM broadcasting station desired by the user is extracted and amplified in the receiving circuit 22 from the received signal received by the antenna 21, and the carrier component is removed in the FM demodulating circuit 23. After that, the signal is demodulated by the stereo demodulation circuit 24 into the stereo sound signals of the left and right channels. The demodulated stereo sound signals of the left and right channels are power-amplified by the amplifiers AL and AR, and then are sounded by the speakers SPL and SPR of the left and right channels. In this way, conventional free broadcasts such as the music and voice can be heard.

The FM broadcasting station U0 is provided with a service information source 6, which is separated from the spectrum of the acoustic signal component up to 53kHz within a baseband of 100kHz. 76 kh
Character multiplexed data of ± 4 kHz with z as the center frequency is output. The character multiplexed data is superimposed on an audio signal in the stereo modulation circuit 2 and output to the FM modulation circuit 3.

Further, the FM broadcast station U0 has a user file 11 storing terminal-specific information and contract contents of the receiving terminal U owned by each user, storage data of the user file 11, and A processing circuit 12 that changes the reception permission code for each user in a manner to be described later, which changes at regular intervals and corresponds to the generally available transmission information;
An information processing device such as a so-called workstation is provided which includes a man-machine interface of the processing circuit 12 such as a keyboard 13 and a display device 14, and a printing device 15 for outputting and printing desired data from the processing circuit 12. ing.

In the FM broadcasting station U0, input is made from the keyboard 13 or the like in accordance with the status of transfer to a financial institution or the like, application for a contract from the user, and notification of change.
Information about each user, such as a name, a telephone number, and a facsimile number, the contract details such as a reception permission period and a receivable program described later, and the terminal-specific information are stored in the user file 11. From the FM broadcasting station U0, an encrypted reception permission code is created based on the contract contents of each user stored in the user file 11, and as shown in FIG. , Or to the user via PC communication.

In the above-described example, the case where the carrier performing limited broadcast of FM teletext broadcasting is the same as the FM broadcast station U0 is shown. , Configuration and service information source 6 for management of each receiving terminal U such as the workstation
Is provided on the business side.

On the other hand, at the receiving terminal U, the received signal is also input to the filter 31 to extract the frequency component of the character multiplexed data.
It is reproduced as character multiplexed data. This character multiplex data is
In the processing circuit 33 realized by a microcomputer or the like, when the service information of the service identification targeted by the receiving terminal U is used, and an appropriate receiving contract is established with the business operator, and limited broadcasting can be received. Is decoded into character data and is displayed as a character such as a character or a symbol by the display device 34 realized by a liquid crystal panel or the like. In this way, for example, a message function, a paging function of reading out only a specific receiving terminal, and the like are realized, and communication and broadcasting can be integrated. In addition, among the character multiplexed data, general available additional information such as date information which can be used as transmission information, which will be described later, is also fetched from the decoder 32 into the processing circuit 33.

In connection with the processing circuit 33, this is realized by a key switch or the like, and performs a channel selection operation, a limited broadcast program page selection operation, an input operation of the reception permission code indicating that the reception contract has been established, and the like. An input device 35 for performing the operation is provided.

Further, in connection with the processing circuit 33, it is used for storing character multiplexed data including the received additional information, managing character multiplexed data, storing display data, managing key switch data, and the like. -RAM, D
A memory M1 realized by a readable / writable memory such as a RAM and a flash memory, and a decoding procedure of the character multiplexed data and the like;
A memory M2 realized by a non-volatile read-only memory such as an EP / ROM, and terminal-specific information unique to each receiving terminal U are recorded at the time of shipment from a manufacturer or at a store. A memory M3 is provided which stores the setting status of the receiving terminal U such as the frequency being received together with information and the like, and is realized by a nonvolatile readable / writable memory such as a flash memory.

The memory M3 is used when the memory M1 is not nonvolatile, and if so, the memory M3 may be omitted. Further, the memories M1 and M2 are
It may be built in the processing circuit 33.

Therefore, the processing circuit 33 includes the input device 3
The reception permission code input from the memory 5 is transmitted to the memory M2 using the terminal-specific information unique to the receiving terminal U stored in the memory M3 and the transmission information received and stored in the memory M1. The reception permission information is decrypted by performing the stored decryption processing as described below,
Of the character multiplexed data input from the decoder 32, character multiplexed data of a receivable program is fetched into the memory M1 for the reception permission period corresponding to the reception permission information,
In response to an input operation to the input device 35, a display is output to the display device 34 as appropriate. In this way, it is possible to receive a limited broadcast using FM teletext broadcasting.

FIG. 2 is a diagram showing an operation flow of a limited broadcast using FM text multiplex broadcasting configured as described above. The owner or user of the receiving terminal U (in the present specification, all users are described in a unified manner) sends desired service contents to the business operator through a financial institution, for example, A predetermined reception fee corresponding to the type of program desired to be received, the reception permission period, and the like is paid.

When the completion of payment of the reception fee is notified from the financial institution or the like to the business operator, the business operator creates reception permission information of the contract content corresponding to the reception fee, as described later, and furthermore, Using the terminal-specific information of the target receiving terminal and the transmission information at that time, a reception permission code is created from the reception permission information, and is notified to the user through the mailing or personal computer communication. Therefore, this reception permission code cannot decode the correct reception permission information due to the difference in the terminal specific information, except for the target receiving terminal. Further, the transmission information includes information such as date information used in FM teletext broadcasting.
The additional information changes every fixed period and is generally available.

The user who has been notified of the reception permission code,
The reception permission code is input from the input device 35 also serving as a tuning key, and in response thereto, the processing circuit 33 of the reception terminal U reads the terminal unique information from the memory M3 as described above, The transmission information that has been received and stored in the memory M1 is read, and the reception permission information is decoded according to the procedure read from the memory M2. Is stored in the memory M3. As a result, it becomes possible to receive the limited broadcast of the service identification corresponding to the reception permission information.

The data structure of FM teletext broadcasting will be described below. For details, see the Official Gazette (August 2, 1994).
5 No. 164). As shown in FIG. 3A, a packet which is a unit of data is composed of a 16-bit information code following a synchronization code for synchronization determination and a check code for error correction and error detection. 272 of 190 bits and 82 bits
One packet is composed of bits.

As shown in FIG. 3B, the information bits are composed of a prefix indicating data identification information and an engagement relationship, and a data block in which the main body of program information and various control information are stored. It is configured.

As shown in FIG. 3C, the prefix is 4-bit service identification data, 1-bit decoding identification data, 1-bit information end data, 2-bit update flag data, It consists of group number data and data packet number data.

[0062] The service identification data is the 4-bit data at the forefront of the prefix.
It is 16 types of data from 0 to 15 (00h to 0Fh). Of these, 0 to 3 (00h to 03h) represent free broadcast programs, and 4 to 12 (04h to 0Ch) represent limited broadcasts and reserves.
4, 15 (0Dh, 0Eh, 0Fh) represent additional information for identifying the time and the broadcasting station, program index information, and an operation signal for broadcasting, respectively.

Therefore, among the service identifications for the limited broadcasting and the reserve, the present invention
Excluding 4 to 6 (04h to 06h) used in information and 7 (07h) used in some broadcasting stations, for example, it can be performed using a service identification of 12 (0Ch).

The decryption identification data may be of a recording type in which subsequent data is displayed only when all data groups described later are received without error, or in the middle of a data group. However, if there is no error in the received data, it is data indicating whether the display is of a sequential type, in which display is performed sequentially. The information end data indicates whether the data packet is data in the middle of the data group or the last data. The update flag data is data that cyclically represents the two bits, that is, 0, 1, 2, and 3.
The data is updated every time the data is updated. Therefore, when the update flag data is the same, it indicates that the data is the same as the data transmitted previously.

The data group number data and the data packet number data together with the information end data represent an assembly structure of service information, and will be described with reference to FIG.

FIG. 4 is a diagram showing a hierarchical structure of text multiplexed data for explaining a receiving operation of FM text multiplex broadcasting. The said 1 of the hierarchy 1 transmitted from FM broadcast station U0
The 6 kbps multiplexed signal is input from the receiving circuit 22 to the decoder 32 via the filter 31, and is first reproduced by a signal demodulation processing section of the decoder 32 into data and a clock. Then, the packet is extracted from the data such as the synchronization detection and the serially transmitted data, and subsequently, the error correction / error detection processing unit of the decoder 32 uses the check code,
In the error correction and error detection of the packet data alone, the error correction is performed on a frame basis. When the error correction and error detection are performed as shown in layer 2, the data packet becomes It corresponds to the information bit. This data packet is added with status information including an error detection determination result from the decoder 32 and input to the processing circuit 33.

In layer 4, one or more data packets are formed into data groups according to prefixes, and in layer 5, program data is decoded from one or more data groups. The program data is stored in layer 6
Is decoded into the character data, and the display is performed by the display device 34. The character information displayed in the hierarchy 6 is recognized as information as in the hierarchy 7 by recognizing the information on the business side and the user side. The processing operations in the layers 4 to 6 are performed by the processing circuit 33 as follows.

FIGS. 5 and 6 are flowcharts for explaining the processing operation of the processing circuit 33. FIG. 5 is a flowchart showing the receiving operation for each packet. In step S1, the status information added to the data packet is read from the decoder 32. In step S2, it is determined from the status information whether an error has occurred. If an error has occurred, the operation ends without taking in data.
If no error has occurred in step S2, the process proceeds to step S3.

In step S3, the prefix in the data packet is read, and in step S4, it is determined whether the service identification of the prefix is the target service identification. If the service identification is a service identification of a free broadcast or a service identification of the additional information, the program index information, and the operation signal, step S
5, when the service identification is the service identification of the limited broadcast targeted by the own station, the process shifts to step S7. When the service identification is the service identification of the limited broadcast and reserved not targeted by the own station, the data is not taken in. , End the operation.

In step S5, the data block is fetched. In step S6, it is determined whether or not the fetching of one packet has been completed. If not, the process returns to step S5, and the processing returns to step S5. Ends capturing of the data block.

In step S7, even if the service identifications match, it is determined from the control information whether or not a predetermined reception permission time limit has been reached as described later. If not, the operation is terminated. If step S8
Move on to

In step S8, data is fetched in the same manner as in step S5. In step S9, descrambling of the fetched data is performed. In step S10, similar to step S6,
It is determined whether or not the capture of the predetermined data has been completed. If not, the process returns to step S8, thus ending the capture of the data block for one packet.

FIG. 6 is a flowchart showing the display operation of the program data fetched as described above. In step S11, the service identification of the program is determined. In addition,
When the service identification is the additional information, the program index information, and the operation signal, the data of the service identification of the limited broadcast and the reserve which is not related to the program display and which is not targeted for the own station is excluded in advance at the time of reception. In step S11, it is determined from the service identification whether the broadcast is a free broadcast or a limited broadcast targeted for the own station. If the broadcast is a free broadcast, the process proceeds to step S13 to display a program. On the other hand, if the broadcast is a limited broadcast targeted for the own station, the process proceeds to step S12.

In step S12, based on the control information,
It is determined whether or not the program can be displayed even if the limited broadcast is the target broadcast.
Then, the process proceeds to step S14, in which a notification that the program contents cannot be presented is displayed.
The program proceeds to 3 to display a program of the limited broadcast service information.

The limited broadcast data is encrypted,
Unless the encryption method and its decryption key are known, decryption cannot be performed. The specifications are not disclosed, and it is generally difficult to obtain the specifications. Therefore, a receiving terminal for free broadcasting cannot utilize the limited broadcasting data even if it receives the limited broadcasting data.
If the service identification of the limited broadcast is determined in step S4, the limited broadcast data is not taken in and ignored.

When the algorithm of the processing circuit 33 is configured to take in data after descrambling, the order of steps S8 and S9 is reversed. Further, according to the algorithm of the processing circuit 33,
In the case where the data fetching is descrambling, it is determined whether or not the received service information is the receivable service information shown in step S12, and only when this is the case, the data fetching operation after step S8 is performed.

Further, a processing circuit such as a decoder having a descrambling function in step S9 is used as the decoder 32, or a circuit having a descrambling function is inserted between the decoder 32 and the processing circuit 33. If the descrambling process has been completed at the time when the data is taken into 33, the information descrambling process is not performed during the processes such as data group creation, program creation and display from the received data packet. The operation shown in FIG. 5 can be represented as shown in FIG. The operation shown in FIG. 7 is the same as the operation of a normal free broadcast receiving terminal.

In the transmission / reception system for the limited broadcast of the FM multiplex broadcasting configured as described above, the carrier stores the user file 11 and manages each receiving terminal U. Now, the terminal-specific information written in the memory M3 at the time of factory shipment or sales will be described in detail. This terminal-specific information is stored in each receiving terminal U so that the operator can manage each receiving terminal U.
Is unique information that can be uniquely obtained. Therefore, as shown in FIG. 8, for example, it can be composed of a company code, a model code, and product information of the receiving terminal.

The company code is a code assigned by the business operator to each manufacturer contracted to manufacture a dedicated receiving terminal, and can be represented by a numeral shown in FIG. 9 or an alphabetic character shown in FIG.

The model code is a code that is set arbitrarily by the business operator or each manufacturing company for each model of each receiving terminal. As in FIGS. 9 and 10, the model code shown in FIG. It can be represented by an alphabetic character such as 12.

Further, the product information is a code assigned to each receiving terminal by each of the manufacturing companies. For example, as shown in FIG. 13, a production location indicating a production country, a production factory, a production line, etc. It is composed of a code, a production lot code indicating production date and lot number, a production serial number code which is a production serial number for each lot, and a code representing other information such as version. Of these codes, the minimum code required to individually identify each receiving terminal, for example, as shown in FIG. 14, a production lot code and a production serial number code are used as the product information.

As shown in FIG. 8, when the product information can specify a manufacturer name or a model name among the three codes constituting the terminal-specific information, any one of them can be specified. Or both may be omitted. Also, if this terminal unique information does not use the number given by the manufacturing company such as the production serial number, but if the company assigns an individual terminal unique number to each manufacturer from the business side, It may be used, or a contract number assigned to each user, for example, may be used.
As described above, the number determined by the business operator may be used. The device-specific information created in this way is
As the number of bits is increased or thinned out,
The data is encrypted with a predetermined bit length, and is commonly stored in the user file 11 on the provider side and the memory M3 in the receiving terminal U.

On the other hand, as shown in FIG. 15, the reception permission information is composed of m-bit expiration date information and n-bit limited reception operation control information. The expiration date information is used in the determination in step S7 in FIG. 5 and the like, and is information indicating a reception permission period for each user.

The reception permission period is calculated based on the reception fee paid by the user, as shown in FIG. The user is provided with the reception fee corresponding to the additional reception period that he / she wants to receive continuously in the guidance at the time of contract, etc., and the carrier side sets the additional reception period corresponding to the received reception fee. Then, this additional reception period is added to the current reception permission period to obtain a new reception permission period. The additional reception period can be set on the basis of the basic reception valid period B, for example, three months. Therefore, the updated new reception permission period is replaced by an integral multiple of the basic reception valid period B0. This is a period in which the period B is added.

Note that when a new contract is made, the current reception permission period B0 is 0, or by setting the current reception permission period B0 at the time of the contract to a predetermined period, free reception is performed only during that period. Can be possible. The reception fee may be set in proportion to the additional reception period, or, as shown in FIG. 16, a predetermined long-term reception contract Discount rate C (C = C1, C2,..., Cn, Cn
... ≦ C2 ≦ C1 = 1).

The conditional access operation control information is used to select receivable broadcasts from a plurality of types of limited broadcasts and to select receivable broadcasts by time zone so as to be used in the determination in step S12 of FIG. It can be used when selecting, or when selecting a receivable broadcast by program classification, and when there is no such selection, that is, in the case of simply selecting whether to permit the reception of limited broadcasting, The conditional access operation control information may be omitted.

Using the reception permission information configured as shown in FIG. 15 and the terminal unique information and transmission information configured as shown in FIG. 8, the reception terminal U , The reception permission information is decoded, and the corresponding limited broadcast reception operation is performed. At this time, the receiving terminal U compares the above expiration date information with the date information managed by the terminal side, and determines whether to permit or prohibit reception. You have
Correct permission / prohibition determination control cannot be performed. For example, when the user sets the date information,
By improperly setting the old date, the receiving terminal whose reception permission expiration date has expired can receive the limited broadcast. In addition, if incorrect date information is set, the date information will be incorrectly set to exceed the expiration date even if it is actually within the reception permission period. Then, there is a problem that the limited broadcast cannot be received.

Therefore, in the present invention, in order to secure the credibility of the date information managed by each receiving terminal U, the date information is converted to the date information transmitted by FM text multiplex broadcasting. If the receiving terminal U has a calendar function, calibration is performed based on the date information of the FM teletext broadcasting, and the information is set as information that cannot be changed by the user.

The date information transmitted by FM text multiplex broadcasting is stored in a data packet of 13 additional information by the service identification, and is broadcast as time information having a structure as shown in FIG. . This time information is 34-bit data including the modified Julian date (MJD) and the Coordinated Universal Time (UTC). The processing circuit 33 fetches the time information stored in the data packet of the additional information having the service identification of 13 as the transmission information and stores the time information in the memory M1.

A method of creating data MJD in modified Julian date notation, which is also used as the expiration date information, will be described. The date that should be the current or expiration date is Y,
When M and D are set, MJD = 14956 + D + int [(Y−L) × 36
5.25] + int [(M + 1 + L × 12) × 30.6
001]. However, the constant L = 1 in the year of Y = 1 or 2, and L = 0 in the other years.

On the other hand, from the obtained data MJD, first, Y ′ = int [(MJD−150788.2 / 365.2)
5) M ′ = int ｛[MJD-14956.1-int
(Y ′ × 365.25)] / 30.6001｝. However, when M ′ = 14 or 15,
K = 1, otherwise, K = 0. From the Y ′ and M ′, the current or expiration date is Y = Y ′ + K M = M′−1−K × 12 D = MJD−14956-int (Y ′ × 365.2.
5) −int (M ′ × 30.6001)

The receiving terminal U calculates the date information from the modified Julian date data MJD of the time information, and calculates the hour / minute information from the hour, minute and local time offset in Coordinated Universal Time. The year, month, day, hour, minute information thus obtained is converted into a data format used by the calendar / clock function of the receiving terminal U, and is stored or set in a calendar / clock circuit.

FIG. 18 is a diagram showing an example of the configuration of data used to realize the calendar / clock function on the receiving terminal U side. On the receiving terminal U side, the calendar / clock data is created as follows. First, the timing of one second is determined by dividing the frequency of a clock signal generated by an oscillation circuit, for example, a clock signal of 32.768 kHz by a frequency dividing circuit, that is, 32.768 kHz.
From 768 = 2 ¹⁵ , the clock signal can be created by dividing the clock signal by a 15-stage divider circuit.

Next, as shown in FIG. 18, the second counter can be realized by a 6-bit cyclic counter of 00 (00h) to 59 (3Bh), and is incremented at the timing of one second. . When the second data is decimal data for display or the like, the second counter is:
A counter for one's digit realized by a cyclic counter of 0 to 9; and 0 to 5 incremented when the carry of the one's digit counter is changed (1's digit changes from 9 to 0).
And a cyclic counter for the tens digit.

The minute counter is also similar to the second counter.
It can be realized by a 6-bit cyclic counter, and when this data is used in decimal, 1
, And 0 to 5 cyclic counters for the tens digit.

The hour counter is, for example, a 5-bit 0 (0
0h) to 23 (17h), which are incremented when the tens digit counter of the minute counter changes from 5 to 0 (carry). Further, for example, a combination of a 1-bit am / pm determination bit and a 4-bit cyclic counter of 0 (00h) to 11 (0Bh) or a decimal counter capable of counting 0 to 23 may be used. A counter corresponding to a display format such as morning / afternoon or 12 hours / 24 hours may be used.

The date counter can be realized by a cyclic counter which starts counting from 1 (01h) and whose upper limit can be changed by the date information.
It is incremented when the hour counter changes from 23 (17h) to 0 (00h). The upper limit is 28 (1Ch) for February excluding leap years, and 29 (1D) for February in leap years.
h) The remaining small months other than February are set to 30 (1Eh), and the large months to 31 (1Fh). Also, by setting the count value of this date counter to 0,
It can be used as a detection status code that the date has not been set.

The day of the week counter is usually 0 to 6 or 1 to
7 can be realized by associating each day with each count value, for example, 0 is Sunday, 1 is Monday, and so on.
The increment timing is the same as that of the date counter.

Also, in this day counter, 0 can be used as an unset detection state code. In this case, the count value is 1 to 7.

The month counter is 1 (01h) to 12 (0C
h) can be realized by a cyclic counter, which is incremented when the date counter changes from the upper limit to one. Also, this month counter can use 0 as an unset detection status code.

The year counter is a counter of a value excluding the thousands digit of the year, and can be realized by a three-digit decimal counter, and is incremented when the month counter changes from 12 to 1. .

These counters are calibrated with the time information shown in FIG.

The processing circuit 33 makes a comparison between the date, month, day, hour, minute, and second information obtained by the above-mentioned counter and the expiration date information, and uses the result of the comparison as a limited broadcast reception permission flag in the memory M3. To memorize. The comparison determination process is performed when the power of the receiving terminal U is turned on, when receiving is started,
This is performed when the program is displayed and when the clock is updated every minute, every hour, every day, and the like. When the limited broadcast is received, the determination in step S7 is performed with reference to the limited broadcast reception permission flag. When the date information obtained from the counter has passed the reception permission period, the reception permission flag is set to a reception prohibited state. Note that the reception permission flag is
In the initial state such as factory shipment or sales, the reception is set to the reception prohibited state. In accordance with this, the reception expiration information of the reception permission information shown in FIG. The date information is set to date information that does not actually exist.

Further, when the limited broadcast reception permission code is input, the limited broadcast reception permission flag may be temporarily set in a receivable state, and the comparison determination may be performed at the time of updating the clock or displaying the program. When the actual date information can be immediately obtained, the reception expiration date information of the reception permission information obtained from the input reception permission code may be compared with the date information.

As a result, when the reception permission code is input, the reception is enabled immediately, and when the correct reception permission code within the reception expiration date is set, the reception can be continued as it is.

Once the limited broadcast reception permission flag has been disabled, the limited broadcast reception flag remains set until a reception permission code is input again.
The flag is held in a prohibited state. In the initial state, an initial state flag that is reset when a reception permission code is input is separately set. In the initial state, reception of the limited broadcast is prohibited, or when the program is displayed, the reception contract period is set. Not displayed "or the like.

When the limited broadcast reception permission flag is not used in the processing circuit 33, the reception permission time limit has elapsed and the reception validity information is not set to all 0s. Also, by prohibiting the reception of the limited broadcast, the same effect can be obtained even if the comparison of the reception permission period is performed every time the calendar information is updated without using a dedicated flag.

FIGS. 19 and 20 show a procedure for creating and decoding a reception permission code according to the first embodiment of the present invention, which is applied to the FM text multiplex broadcast limited transmission / reception system configured as described above. 5 is a flowchart for explaining FIG. FIG. 19 shows a procedure for creating a reception permission code, which is performed by the workstation on the business side or the like in response to a payment notice of a reception fee from a financial institution or a contract application from a user. .

As described above, on the business side, FIG.
Terminal unique information as shown in FIG. 8 is created based on information unique to each receiving terminal U as shown in FIG. 14 and stored in the user file 11. Further, year / month data obtained from time information of the transmitted additional information is used as transmission information.

On the other hand, based on the received reception fee,
The reception permission expiration date and the contract contents, etc., which are obtained as shown in FIG. 15, are read from the user file 11, and based on them, the reception permission information is created as shown in FIG. In addition, CRC (Cyclic Redundancy Check)
) Codes, etc., for error detection.

The reception permission information to which the error detection code has been added is combined with the terminal specific information and transmission information to create a reception permission code. This reception permission code is, for example, 48 bits, and one digit is 4h of 0h to Fh.
This is a code composed of 12 hexadecimal digits.
This reception permission code is transmitted through postal mail, personal computer communication, and data communication from a business using a telephone line.
The user is notified.

The combination of the reception permission information to which the error detection code is added, the terminal-specific information, and the transmission information may be combined by, for example, obtaining an exclusive OR of them. May be directly synthesized. The reception permission code thus obtained is a code dedicated to each receiving terminal.

FIG. 20 shows a procedure for decoding the reception permission code, which is performed in response to the input of the reception permission code from the input device 35 by the user. Processing circuit 3
When the reception permission code is input, the memory M3
Is read out and the transmission information stored in the memory M1 is read out, and the signal processing reverse to that at the time of the combination shown in FIG. 19 is performed to decode the reception permission information having the error detection code. I do. Error detection is performed on the decoded reception permission information using the error detection code, and when no error is detected, the decoded reception permission information is stored in the memory M3. When an error is detected, error processing such as generation of an error sound and error display is performed, and the user is notified.

FIG. 21 is a timing chart showing an operation example of the reception permission code created and used as described above. First, after confirming the payment of the reception fee from the user, the business operator combines the reception permission code and issues it to the user, as indicated by reference numeral t1. At this time, the transmission information used for the combination is year / month information representing April 1997 in the example of FIG. Since the reception permission code changes in May of the following month, the last day of April is the input expiration date of the reception permission code indicated by reference numeral t2, and the period from the issuance date to the input expiration date is indicated by reference numeral T4. The reception permission code input valid period shown in FIG.

When a correct reception permission code is input within the reception permission code input valid period T4, the reception permission period set in the expiration date information in the reception permission information becomes:
From the issuance date of the reception permission code, the reception period T5 is added to the delivery period T5, and the reception period is indicated by a reference t3.

Therefore, if the transmission information changes, correct reception permission information cannot be set even if the terminal-specific information matches. As a result, the input validity period of the predetermined period is set in the reception permission code. Therefore, even if the user erroneously sets the reception permission code of the old reception permission period used once, the reception permission code is set. Since the transmission information is different, the code is erroneous and is notified to the user by the generation of the error sound and the error display as described above. In this way, it is possible to prevent a problem that the user mistakenly sets the reception permission code of the old reception permission period and the reception cannot be performed, and to notify the user of such a problem. Then, a correct reception permission code can be input.

Further, as described above, the reception permission information is
Rather than transmitting to each receiving terminal U using a broadcast wave of teletext, instead of transmitting to the receiving terminal U using the post or personal computer communication, the transmission capacity of the limited broadcast is not impaired, and more service information is transmitted. Or more reliable service information can be provided. Even if the user sets the reception permission code in this way, an error detection code is added to the reception permission information, and erroneous input can be reliably prevented.

Further, the reception permission information is in a state of being encrypted by terminal-specific information and transmission information, and the terminal-specific information is created based on information such as the serial number which can be known by the user. Therefore, even if the user tries to find it and use it illegally, the correct reception permission information cannot be decrypted by the encryption using the transmission information, and the reception of the service information is not permitted. Therefore, it is possible to accurately receive only the service information contracted with the provider for the contracted period, and to ensure high security.

For decoding the reception permission information from the reception permission code, a processing circuit 33 for decoding limited broadcast data of FM text multiplex broadcasting to form character data is used. Also, by using the input device 35 realized by a key switch for channel selection, volume control, etc., the number of parts does not increase with respect to a normal FM teletext receiving terminal, and therefore the cost is reduced. The rise can also be suppressed.

FIG. 2 shows a second embodiment of the present invention.
2 and FIG. 23 will be described below.

FIG. 22 is a diagram showing a procedure for creating a reception permission code according to the second embodiment of the present invention, and FIG. 23 is a view showing a procedure for decoding the reception permission code. In the present embodiment, the reception permission information, the terminal specific information, and the transmission information are each used to create a reception permission code after being encrypted. Also, the entire synthesized reception permission code is
Encrypted.

Corresponding to this, the terminal-specific information set for each receiving terminal U is also subjected to the same encryption, and the received information of the received transmission information is also encrypted. After the error determination, the permission information is subjected to a decryption process that is the reverse of the encryption process.

The above-mentioned encryption processing is realized by, for example, rearranging the data sequence in a predetermined order, or logically synthesizing the data sequence with a pattern generated by a PN code generation circuit which is a predetermined random number generation circuit. It is possible,
It is sufficient that the reception permission information cannot be easily determined from the reception permission code.

With this configuration, the terminal-specific information is created based on information that can be known by the user, such as the product number, and the error detection code such as the CRC code is decoded. However, correct reception permission information cannot be decrypted, confidentiality can be improved, and unauthorized use can be more reliably prevented.

In the example described above, all of the reception permission information, the terminal unique information and the transmission information are subjected to the encryption processing, but only one of them may be used. The same effect can be obtained in the encryption processing of the reception permission information even after the error detection code is added. However, if the error detection code is added after the reception permission information is encrypted as described above, the decoding is performed after the error determination, and the erroneous input determination of the reception permission code can be quickly performed. .

The present invention is not limited to limited FM text multiplex broadcasting, but is also suitable for other multiplex broadcasting such as teletext television broadcasting, which provides service information using the gap between broadcast waves. Can be implemented. Further, the transmission information is not limited to the time information of the additional information. For example, if the program index information is updated at regular intervals, it may be used.

[0127]

According to the method for transmitting and receiving service information according to the first aspect of the present invention, as described above, a method for transmitting and receiving service information which is preferably performed in a limited broadcast of FM teletext broadcasting is provided by a broadcast station. On the business side, such as the reception fee transfer status of each user and the contents of the contract, the reception permission information indicating the reception permission expiration date and available service contents, etc. is created, and the created reception permission information After adding an error detection code to the receiving terminal, a reception permission code is created by combining terminal-specific information unique to each receiving terminal and general-usable transmission information that changes at regular intervals such as year and month information. Then, the user is notified by mail, personal computer communication, or the like, and on the receiving terminal side such as a listener, when the user inputs the reception permission code from input means such as a channel selection button, the reception terminal stores the reception permission code in advance. Terminal specific information And decoding the reception permission code using the received transmission information and performing error detection using the error detection code. When the decoded reception permission information indicates reception permission and there is no error, , The service information of the service identification corresponding to the reception permission information can be received.

Therefore, since the reception permission code is not transmitted by the broadcast wave, the transmission capacity of the service information does not decrease. Also, decryption of the reception permission information
By using a microcomputer or the like that decodes the received service information and converts it into character data and the like, and that the input of the reception permission information is also performed by using the tuning button and the like, the cost of the receiving terminal can be reduced. The rise can be suppressed.

Further, the reception permission information is in a state of being encrypted by the terminal-specific information and the transmission information, and even if the user tries to use the terminal-specific information based on the serial number or the like to illegally use the information, It is impossible to accurately decode the reception permission information by encrypting the transmission information, and thus it is possible to receive only the service information contracted with the business operator accurately for the contracted period. Can be secured. Also,
Since the input validity period of the predetermined period is set in the reception permission code, it is possible to prevent erroneous input of the reception permission code of the old reception permission period used once.

In the method for transmitting and receiving service information according to the second aspect of the present invention, as described above, the reception permission information,
At least one of the terminal-specific information and the transmission information is encrypted.

Therefore, the terminal-specific information is created based on information that the user can know, such as the serial number,
Even if the user attempts to set the reception permission code illegally after the reception permission expiration date has passed, the correct reception permission code cannot be determined, and thus the unauthorized use can be prevented.

Further, in the method for transmitting and receiving service information according to the third aspect of the present invention, the reception permission code is further encrypted as described above.

Therefore, even if the encryption is performed as described in claim 2 and the encryption method is decrypted by some detailed users, the entire reception permission code is encrypted, Use can be more reliably prevented.

In the method for transmitting and receiving service information according to the fourth aspect of the present invention, as described above, the transmission medium of the service information is a limited broadcast of a character multiplex broadcast in frequency modulation broadcast.

Therefore, it is possible to effectively use the transmission capacity of service information which is extremely small as compared with satellite broadcasting or the like.

Furthermore, the service information transmitting / receiving apparatus according to the fifth aspect of the present invention is an apparatus for transmitting / receiving service information which is suitably implemented as an FM character multiplex broadcasting limited broadcast transmitting / receiving apparatus as described above. On the broadcast side, the broadcaster and other operators create reception permission information indicating the reception permission expiration date and available service contents, etc., in accordance with the reception fee transfer status of each user and the contents of the contract, etc. After adding an error detection code to the received permission information, the terminal-specific information that is unique to each receiving terminal and the transmission information that changes at regular intervals, such as year and month information, and are generally available are combined to allow reception. Create a code, notify the user using mail or personal computer communication, etc., on the receiving terminal side such as a listener, when the user enters the reception permission code from input means such as a channel selection button, The received permission code is decoded by using the stored terminal-specific information and the received transmission information, and error detection is performed by using an error detection code. The decoded reception permission information indicates reception permission. If there is no error, the service information of the service identification corresponding to the reception permission information can be received.

Therefore, since the reception permission code is not transmitted by the broadcast wave, the transmission capacity of the service information does not decrease. Also, decryption of the reception permission information
By using a microcomputer or the like that decodes the received service information and converts it into character data and the like, and that the input of the reception permission information is also performed by using the tuning button and the like, the cost of the receiving terminal can be reduced. The rise can be suppressed.

Further, the reception permission information is in a state of being encrypted by the terminal-specific information and the transmission information, so that even if the user tries to use the terminal-specific information based on the serial number or the like to illegally use the information, It is impossible to accurately decode the reception permission information by encrypting the transmission information, and thus it is possible to receive only the service information contracted with the business operator accurately for the contracted period. Can be secured. Also,
Since the input validity period of the predetermined period is set in the reception permission code, it is possible to prevent erroneous input of the reception permission code of the old reception permission period used once.

In the service information transmitting / receiving apparatus according to the sixth aspect of the present invention, as described above, the reception permission information,
At least one of the terminal-specific information and the transmission information is encrypted.

Therefore, the terminal-specific information is created based on information that can be known by the user, such as a serial number,
Even if the user attempts to set the reception permission code illegally after the reception permission expiration date has passed, the correct reception permission code cannot be determined, and thus the unauthorized use can be prevented.

Further, in the service information transmitting / receiving apparatus according to the seventh aspect of the present invention, the reception permission code is further encrypted as described above.

Therefore, even if encryption is performed as described in claim 6 and the encryption method is decrypted by a part of the detailed user, the encryption of the entire reception permission code causes an unauthorized Use can be more reliably prevented.

In the service information transmitting / receiving apparatus according to the invention of claim 8, as described above, the transmission medium of the service information is a limited broadcast of a text multiplex broadcast in a frequency modulation broadcast.

Therefore, it is possible to effectively use the transmission capacity of service information which is extremely small as compared with satellite broadcasting or the like.

Further, the service information receiving apparatus according to the ninth aspect of the present invention provides a service information receiving apparatus suitably implemented as an FM character multiplex broadcast limited broadcast receiving apparatus as described above. When receiving a reception permission code given by a business operator such as a bureau by mail or personal computer communication, the user inputs the reception permission code, and in response to the reception permission code, stores the code in advance. The terminal-specific information of the receiving apparatus, the received permission code is decoded using the received transmission information that changes every fixed period, and performs error detection using the error detection code,
When the decrypted reception permission information indicates reception permission and there is no error, reception of service information of the service identification corresponding to the reception permission information is enabled.

Therefore, the reception permission code is not transmitted together with the service information. That is, in the case of the FM teletext broadcasting, the reception permission code is transmitted not by a broadcast wave but by mail or personal computer communication. Is transmitted to a specific user who should be permitted, so that the transmission capacity of service information does not decrease. Further, decoding of the reception permission information from the reception permission code can be performed using a microcomputer or the like that converts the service information received by the reception unit into a form usable by a user,
An increase in the cost of the receiving device can be suppressed.

Further, the reception permission information is in a state of being encrypted by terminal-specific information and transmission information, and the terminal-specific information is created based on information that the user can know, such as the serial number. Therefore, even if the user tries to find it and use it illegally, the correct reception permission information cannot be decrypted by the encryption using the transmission information, and the reception of the service information is not permitted. Therefore, it is possible to accurately receive only the service information contracted with the provider for the contracted period, and to ensure high security.

If the transmission information changes, correct reception permission information cannot be set even if the terminal-specific information matches. As a result, the input validity period of the fixed period is set in the reception permission code, so that the user erroneously sets the reception permission code of the old reception permission period used once and cannot receive. It is possible not only to prevent such troubles from occurring, but also to notify the user of such troubles and to input a correct reception permission code.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a limited broadcast of FM teletext broadcasting according to an embodiment of the present invention.

FIG. 2 is a diagram showing an operation flow of limited broadcast of FM teletext broadcasting of the present invention.

FIG. 3 is a diagram showing a data structure of FM teletext broadcasting.

FIG. 4 is a diagram for explaining a hierarchical structure of the data.

FIG. 5 is a flowchart illustrating an example of an operation of capturing program data for each received packet.

FIG. 6 is a flowchart showing an operation of displaying captured program data.

FIG. 7 is a flowchart showing another example of the operation of capturing program data for each received packet.

FIG. 8 is a diagram showing an example of terminal-specific information used in the present invention.

FIG. 9 is a diagram showing an example of a company code constituting the terminal-specific information and given to a manufacturer of each receiving terminal.

FIG. 10 is a diagram showing another example of a company code constituting the terminal-specific information and given to a manufacturer of each receiving terminal.

FIG. 11 is a diagram showing an example of a model code assigned to each model of each receiving terminal in the terminal-specific information.

FIG. 12 is a diagram showing another example of a model code assigned to each receiving terminal in the terminal-specific information.

FIG. 13 is a diagram showing an example of product information given to each receiving terminal in the terminal-specific information.

FIG. 14 is a diagram showing another example of the product information given to each receiving terminal in the terminal-specific information.

FIG. 15 is a diagram showing the structure of reception permission information managed on the business side.

FIG. 16 is a table showing a reception fee and a reception permission period for an additional reception period that a user applies for at the time of contract or renewal.

FIG. 17 is a diagram showing a data structure of time information transmitted by FM teletext broadcasting.

FIG. 18 is a diagram illustrating a configuration example of data for a calendar / clock function in each receiving terminal.

FIG. 19 is a diagram showing a procedure for creating a reception permission code according to the first embodiment of the present invention.

20 is a diagram showing a procedure for decoding the reception permission code created as shown in FIG.

FIG. 21 is a timing chart showing an operation example of a reception permission code.

FIG. 22 is a diagram showing a procedure for creating a reception permission code according to the second embodiment of the present invention.

FIG. 23 is a diagram showing a procedure for decoding the reception permission code created as shown in FIG.

[Description of Signs] 1 stereo acoustic signal source 2 stereo modulation circuit 3 FM modulation circuit 4 transmission circuit (transmission means) 6 service information source (information creation source) 11 user file 12 processing circuit (reception permission code creation means) 13 keyboard 14 display device 15 printing device 22 receiving circuit (receiving means) 23 FM demodulation circuit 24 stereo demodulation circuit 31 filter 32 decoder 33 processing circuit (decoding means) 34 display device 35 input device (input means) M1 memory M2 memory M3 memory ( Storage means)

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI H04N 7/03 7/035 (72) Inventor Kozo Hayashi 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation (72 ) Inventor Kazuhiro Kishimoto 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka, Japan (72) Inventor Katsuhiro Tochihara 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka, Japan

Claims (9)

[Claims] 1. A method for enabling a predetermined receiving terminal to receive service information multiplexed on a broadcast wave and transmitted from a carrier, wherein the carrier permits reception of the service information. It is composed of information obtained by adding a predetermined error detection code to reception permission information, terminal-specific information specific to the receiving terminal to which reception is to be permitted, and transmission information that changes at regular intervals and is generally available. A reception permission code is created and assigned to each of the users of the reception terminals that should be able to receive the conditional access. On the reception terminal side, the user sets the assigned reception permission code in the reception terminal, The terminal uses the terminal-specific information stored in advance and the received transmission information to decode the set reception permission code and performs error detection, and the decoded reception permission information indicates reception permission. Represent One When there is no error, the method of transmitting and receiving service information, characterized in that to enable reception of the service information. 2. The service information transmitting / receiving method according to claim 1, wherein at least one of the reception permission information, terminal specific information, and transmission information is encrypted. 3. The method for transmitting and receiving service information according to claim 1, wherein said reception permission code is further encrypted. 4. The service information transmitting / receiving method according to claim 1, wherein the transmission medium of the service information is a limited broadcast of a text multiplex broadcast in a frequency modulation broadcast. 5. An apparatus for enabling a predetermined receiving terminal to receive service information multiplexed on a broadcast wave and transmitted from a service provider, wherein the service provider has an information generation source for service information to be transmitted. Transmitting means for adding a service identification indicating that the service information can be limitedly received only to a predetermined user to the service information and transmitting the service information; terminal-specific information unique to a receiving terminal of each user; A user file storing service contents that can be provided to each user, and the terminal-specific information and service contents stored in the user file are read, and reception permission information corresponding to the service contents is created and created. The terminal-specific information and the transmission information that changes at regular intervals and is generally available are added to information obtained by adding a predetermined error detection code to the reception permission information. Receiving permission code generating means for generating a receiving permission code, and assigning the receiving permission code to each of the users of the receiving terminals that should be able to receive the limited reception. The receiving terminal side receives the service information having the same service identification. Receiving means capable of notifying a user; input means for inputting the reception permission code by the user; storage means for preliminarily storing terminal-specific information unique to the receiving terminal; The received reception permission code is decoded using the terminal-specific information stored in the storage means and the received transmission information, and error detection is performed. The decoded reception permission information indicates reception permission. And a reception permission code decoding unit for enabling the reception unit to receive the service information when there is no error. 6. The service provider further comprises first encryption means for encrypting at least one of the reception permission information, terminal specific information, and transmission information, wherein the reception terminal performs the reception permission. When the information and / or terminal-specific information is encrypted, it is decrypted. When the transmission information is encrypted, a first encryption is performed on the transmission information in the same manner as the first encryption means. 6. The service information transmitting / receiving apparatus according to claim 5, further comprising a decoding unit. 7. The service provider further comprises a second encrypting means for encrypting the reception permission code, wherein the receiving terminal decrypts the encrypted reception permission code. The service information transmitting / receiving apparatus according to claim 5, further comprising a conversion unit. 8. The service information transmitting / receiving apparatus according to claim 5, wherein the transmission medium of the service information is a limited broadcast of a text multiplex broadcast in a frequency modulation broadcast. 9. An apparatus for receiving service information transmitted from a business side, receives service information having a service identification indicating that limited reception is possible only for a predetermined user, and notifies the user. Receiving means capable of inputting a reception permission code assigned to each user; storage means for storing pre-assigned unique terminal-specific information; The permission code is decoded using the terminal-specific information stored in the storage unit and the received transmission information that is generally available and changes at regular intervals,
And a reception permission code decoding unit that enables reception of service information by the reception unit when error detection is performed and the decoded reception permission information indicates reception permission, and there is no error. Device for receiving service information.