JP6734983B2 - Receiving method - Google Patents

Description

The description of the embodiments relates to a receiving method for receiving a broadcast signal.

Currently, in devices that receive terrestrial digital television broadcasts, BS digital broadcasts, and broadband CS digital broadcasts, a function to record two different programs at the same time (double recording function), as well as an all-channel recording function, are broadcast at multiple same times. A device capable of simultaneously recording (recording) recorded programs has been commercialized.

On the other hand, these broadcasts are scrambled on almost all channels regardless of whether they are pay broadcasts or free broadcasts. Therefore, in order to receive and watch a program, CAS (Conditional)
An Access System module (IC card) is essential.

The history of this scramble will be described. When BS digital broadcasting started on December 1, 2000, only pay broadcasting was scrambled, and the Japan Broadcasting Corporation (NHK) and free private broadcasting were non-scrambled broadcasting.

The purpose of scrambling in the above pay broadcasting is to establish a pay broadcasting business. For this reason, at the time of shipment of receivers, basically all receivers are scrambled so that they cannot be received, and only subscribers who have signed a contract to view pay broadcasts can scramble pay-view programs. By handing the unlocking key, the receiver can watch the contracted program. As a result, a pay broadcasting business has been established in which a contract program can be viewed by concluding a reception contract to pay the price.

A mechanism of television broadcasting that enables only the subscriber to descramble the contracted program is called a conditional access system (CAS: Conditional Access System). The conditional access system is stipulated by ARIB (Standard Association of Radio Industries and Businesses) standard STD-B25 for terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting in Japan, and the conceptual diagram is the standard STD. -B25 Part 1 Chapter 3 describes.

The conditional access system uses a triple key system to allow only the subscriber to descramble the program. The triple key method uses a master key (Km) stored in a CAS module (IC card) to decrypt individual information EMM (Entitlement Management Message) sent from a broadcasting station, and a work key (Kw) as a key. Take it out. Using the extracted work key (Kw), the common information ECM (Entitlement Control Message) sent from the broadcasting station is decrypted to extract the scramble key (Ks). The scramble key (Ks) is used to descramble the scrambled content sent from the broadcasting station.

The broadcast station frequently changes and sends the scramble key (Ks) to prevent illegal descrambling (the same key is used for about 1 second). Therefore, the broadcasting station sends the ECM having the scramble key (Ks) of the video by the broadcast wave prior to the video to be descrambled.

On the other hand, when BS digital broadcasting was started in December 2000, ARIB TR-B15 was stipulated as an operational regulation that regulates actual operational parameters of this broadcast. According to the ARIB TR-B15 Part 1 BS digital broadcasting operation rules, the fifth part BS digital broadcasting conditional access system (CAS) receiver specifications and operation rules, the update cycle of the scramble key (Ks) is the analog television up to that time. However, in consideration of the two-screen function (simultaneous viewing) that has been commercialized and the so-called back-recording function of recording another channel (CH) during viewing, the update cycle is specified to be about 1 second described in the standard STD-B25. On the other hand, a background is described in which at least two different channels can be viewed and backed up at the same time if the update period is set to 2 seconds or more.

"Access Control Standards for Digital Broadcasting" ARIB STD-B25 6.5 Edition Revised March 17, 2015, Japan Association of Radio Industries and Businesses "Access control method for digital broadcasting (2nd generation) and download method standard for CAS programs" ARIB STD-B61 1.2 version Revised December 3, 2015, Japan Association of Radio Industries and Businesses ARIB TR-B14 Version 6.2 Revised on July 6, 2016, General Incorporated Association "BS/Broadband CS Digital Broadcasting Operation Regulations Technical Data" ARIB TR-B15 7.1 version Revised July 6, 2016, General Incorporated Association "Technical data for advanced broadband satellite digital broadcasting operation regulations" ARIB TR-B39 1.0 version Revised July 6, 2016, General Incorporated Association

In order to descramble the contract broadcast program, the scramble key (Ks) is required as described above, and the work key (Kw) is used to obtain this scramble key (Ks) (update cycle 2 seconds). It is necessary to decrypt the ECM (update cycle of 2 seconds) including the scramble key (Ks). To obtain the work key (Kw), the master key (Km) unique to the CAS module is used. It is necessary to decrypt the EMM containing (Kw) (eg sent once a day).

On the other hand, current receivers have commercialized devices capable of simultaneously recording (recording) a plurality of programs broadcast at a certain time, such as an all-channel recording function. That is, (1) there is an environment in which a large number of tuners can be used simultaneously in the receiver. In this case, scramble keys (Ks1 to Ksn) for a large number of tuners are required within 1 second or 2 seconds, and it is examined whether the receiver can take out the scramble key within a predetermined time. There is a need. (2) In the conditional access system, the EMM is transmitted for displaying/erasing the pay broadcast contract information and the automatic display message, but there are two main purposes. One is EMM transmission for renewal of the expiration date of the pay contract, and the other is a request for unlocking the key immediately after applying for subscription or deleting the automatic display message when a new subscriber subscribes to a business operator. In some cases, the erasing EMM is immediately sent in order to comply with the above. At this time, assuming that the receiver may miss the EMM acquisition, the same EMM may be repeatedly sent in the broadcast signal within 1 second or 2 seconds. Since the control unit of the receiver cannot determine whether or not the contents of the EMM have been updated, even under such an environment, a large number of tuners described in (1) can be used within one second or two seconds. For each scrambled video signal to be processed, it is necessary that each scramble key (Ks1 to Ksn) be surely acquired by the receiver.

The consideration for ensuring that this scramble key is obtained at the receiver needs to be considered in the current rules. If the receiver fails to acquire the scramble key, some subscribers may not be able to view the subscribed program.

In view of this, the present embodiment provides a receiving method that enables viewing of a contracted program without missing the processing of ECM and EMM necessary for descrambling even if, for example, exactly one CAS module is used. The purpose is to

According to the embodiment, the first tuner unit receives the first digital television broadcast including the first service signal transmitted by the first business entity, and is encrypted in the first service signal. 1a control information (EMM) of the first business entity including the 1a key (Kw), and 2a control information (ECM) of the first business entity including the encrypted second a key (Ks). And receiving the first scrambled content,
The second tuner section, the second receiving a digital television broadcast includes a second service signal the second entity sends, included in the second service signal, the 1b key (Kw encrypted ) 1b control information (EMM) of the second entity, 2b control information (ECM) of the second entity including the encrypted second b key (Ks) and second scrambled content. Received,
A descrambler descrambles the first and second scrambled contents output from the first tuner unit and the second tuner unit,
The control unit checks a predetermined first table of the first contents of the first service signal and a predetermined second table of the second contents of the second service signal output from the descrambler;
The 1a control information (EMM), the 2a control information (ECM), the 1b control information based on the packet IDs included in the predetermined first table and the predetermined second table. (EMM), extracting the second b control information (ECM), respectively.
Controlling the first tuner section, the second tuner section, and the descrambler,
The CAS module is controlled by the control unit, acquires the 1a key (Kw) using the unique 3a key (Km) from the 1a control information (EMM) of the first business entity, and acquires the 1a key (Kw). Obtaining the second a key (Ks) to give to the descrambler from the second a control information (ECM) of the first entity using the first a key (Kw) that has been
Acquiring the second entity the first 1b control information using said unique first 3b key (Km) from (EMM) third 1b key (Kw), using the acquired first 1b key (Kw) And obtaining the second b key (Ks) to give to the descrambler from the second b control information (ECM) of the second entity,
Equipped with
Storing the first a control information (EMM) of the first business entity in a first buffer and storing the second a control information (ECM) of the first business entity in a second buffer,
Further, the control unit receives the first-a control information (EMM) and then transmits a first-a command corresponding to the first-a control information (EMM) to the CAS module, and a first period. It is a second period different from the first period, and after receiving the 1b control information (EMM), performs the 1b command transmission corresponding to the 1b control information (EMM) to the CAS module. Setting the second period, and processing at least R (integer of 1 or more) pieces of the 1a control information (EMM) in the first period; and in the second period, 1b control information (EMM) is set to be processed at least R (integer of 1 or more),
Between the reception of the first a control information (EMM) and the transmission of the first a command corresponding to the first a control information (EMM) to the CAS module within the first period, Performing a 2a command transmission corresponding to the 2a control information (ECM) of the first business entity received by the first tuner unit to the CAS module,
Between the reception of the first b control information (EMM) and the transmission of the first b command corresponding to the first b control information (EMM) to the CAS module within the second period, Performing a second b command transmission corresponding to the second b control information (ECM) of the second business entity received by the second tuner unit to the CAS module,
After storing the 1a control information (EMM) of the first business entity received by the first tuner unit in the first buffer, the second buffer control information of the first business entity in the second buffer. If (ECM) is not stored, then perform the 1a command transmission of the first entity to the CAS module;
After storing the 1a control information of the received first entity (EMM) by the first tuner section to the first buffer, the 2a control information of the first entity to the second buffer (ECM) is stored, the first business entity is transmitted before the first a command corresponding to the first a control information (EMM) of the first business entity is transmitted to the CAS module. The second method includes transmitting the second command corresponding to the second control information (ECM) to the CAS module.

FIG. 1 is a diagram showing a configuration example of an entire system of a broadcasting station and a receiver (also called a receiving device) according to an embodiment. FIG. 2 is a diagram schematically showing the main configuration of the broadcasting station 200. FIG. 3 is a diagram showing in detail the configuration of the receiver according to the embodiment. FIG. 4A is a conceptual diagram of the conditional access system described in Non-Patent Document 1. FIG. 4B is an ECM in the case of terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting, a scramble key (Ks) included therein, and a broadcast descrambled using the scramble key (Ks). It is a figure which shows the time relationship of a signal. FIG. 4C is a conceptual diagram of the conditional access system described in Non-Patent Document 2. FIG. 5 is a basic configuration diagram when the receiver descrambles, described in Non-Patent Document 4. FIG. 6 is a processing flowchart of limited reception processing performed by the receiver shown in FIG. 5 described in Non-Patent Document 1. FIG. 7 is a diagram conceptually showing the update cycle of the scramble key (Ks) and the processing of ECM and EMM. FIG. 8 is a basic configuration diagram of a receiver for descrambling broadcast waves in the case of having two tuners, in contrast to the basic configuration of a receiver for having one tuner shown in FIG. FIG. 9 is a basic configuration diagram of a receiver when descrambling a broadcast wave when it has three tuners, in contrast to the basic configuration of a receiver when it has two tuners shown in FIG. FIG. 10 is a diagram showing the temporal relationship between ECM, EMM, and scramble key (Ks). FIG. 11 illustrates a timing at which the transmission side described in Non-Patent Document 4 transmits an ECM including a scramble key (Ks) and a timing at which a descrambled video signal is transmitted using the scramble key (Ks) included in the ECM. It was done. FIG. 12 is an explanatory diagram relating to an implementation example of conditional access of the receiver in the transmission/reception system according to the transmission rule shown in FIG. FIG. 13 is a diagram showing an embodiment in which the number of tuner units is increased to three and a recording/recording unit is further added to the basic configuration of the receiver shown in FIG. FIG. 14 is an explanatory diagram related to an implementation example of conditional access of the receiver illustrated in FIG. 13. FIG. 15 is a basic configuration diagram of the advanced BS digital broadcast and advanced broadband CS digital (hereinafter 4K8K) broadcast receiver described in Non-Patent Document 5. FIG. 16 is a basic configuration diagram of another receiver when descrambling a broadcast wave when the receiver having the basic configuration of FIG. 15 has three tuner units. FIG. 17 is an explanatory diagram related to an implementation example of conditional access of the receiver illustrated in FIG. 16. FIG. 18 is another embodiment and is a diagram showing a basic configuration example of a receiver having two 4K8K receiving tuner units and three 2K receiving tuner units. 19 is an explanatory diagram related to an implementation example of conditional access of the receiver illustrated in FIG. 18. 20 is an explanatory diagram related to an implementation example of conditional access of the receiver, similar to FIG. FIG. 21A is the receiver shown in FIG. 18 WHEREIN: 1st tuner part (4K8K) 1801-1, 2nd tuner part (4K8K) 1801-2, 3rd tuner part (2K) 1801-3, 4th tuner part. It is a figure which shows the example of the time chart which received ECM and EMM from (2K) 1801-4 and the 5th tuner part (2K) 1801-5. FIG. 21B is a diagram showing a temporal transition in which the integrated CAS module of FIG. 18 performs ECM/EMM processing on the ECM/EMM shown in FIG. 21A. FIG. 22 is a flowchart for the receiver to request the ECM and EMM processing to the CAS module in order to give the highest priority to the 2K broadcast ECM processing described in FIGS. 21A and 21B. FIG. 23 is a diagram showing an example of the EMM reception buffer having a storage area for storing the time when the EMM is received. FIG. 24 is a data processing flowchart of the receiver according to the embodiment that operates according to a predetermined rule. FIG. 25 is a flowchart of the process shown in FIG. 24. “The EMM that manages for each business and judges the reception time of the buffer of the EMM waiting for processing and the EMM received within the EMM processing grace period (30 seconds) is in the EMM buffer. 5 is a processing flowchart of EMM reception by the receiver when the “addition of discarding an EMM received later” is added when the EMM already exists.

Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration example of an entire system of a broadcasting station and a receiver (also called a receiving device) according to an embodiment.

The broadcasting station 100 includes a broadcasting station server 101, a first security function 102, and a first basic function 103.

The first basic function 103 is a basic function of the broadcasting station 100, and encodes (also referred to as "encode") video signals, audio signals, and the like of programs to be broadcast, and multiplexes the broadcast signals (the broadcast signals are terrestrial signals). It may be a broadcast signal of any broadcast wave type such as digital television broadcast, BS digital broadcast, broadband CS digital broadcast, advanced BS digital broadcast, advanced broadband CS digital broadcast). Therefore, the transmission signal is assumed to include the route via the satellite. In addition, the transmission signal may include a route by a cable.

In addition, the broadcasting station 100 can add a service that simultaneously provides application functions such as BML and HTML to a program to be broadcast. In this case, the broadcasting station 100 can arrange the first designation information indicating that the application function is added to the program to be broadcast in the transmission control signal, and send it as the broadcast signal by the first basic function 103. ..

The broadcast station server 101 is an area in which metadata such as program titles, program IDs, program outlines, performers, broadcast dates and times, and other data are stored in advance so as to be transmitted to receivers by broadcast signals.

The first security function 102 can set the protection of the content (program) included in the broadcast wave transmitted by the broadcast station.

A service provider device (sometimes referred to as a service provider) 120, in cooperation with the broadcast station 100, creates and manages content in a service that simultaneously provides application functions added to programs broadcast by the broadcast station 100. , Provide (also called distribution). The service provider device 120 includes an application management/distribution 121 and an application server 122.

The application management/distribution 121 manages contents and applications stored in the application server 122 and distributes them to the receiver 140.

The application server 122 is an area for storing contents and applications provided to the receiver 140.

Further, the service provider device 120 responds to the request from the receiver 140 that has received the first designation information, and then uses the application management/distribution 121 to manage the applications and contents stored in the application server 122 by using the communication network such as the Internet. To the receiver 140 via.

The receiver 140 includes a digital broadcast receiving function (second basic function 141), a communication control unit 142, a second security function 143, an application management function 144, an API (API: Application Programming Interface) 145, an application 146, and The control unit 147 is included, receives a broadcast signal broadcast from the broadcasting station 100 to receive various broadcast programs and various service information, and acquires an application from the service provider apparatus 120 via a communication network to operate the application. You can

The second basic function 141 is a basic function of the receiver, receives a broadcast wave sent from the broadcast station 100, and encodes a video signal (also called a video stream) included in the broadcast wave, It has a function of separating encoded audio signals (also called audio streams) and control signals such as transmission control signals, decoding video signals and audio signals, and analyzing control signals such as transmission control signals.

The second basic function 141 is to connect to and receive data from peripheral devices connected to the receiver 140, for example, the display 160, HDD (Hard Disk Drive) 162 bound to the receiver 140, and removable media 170. Also manage.

The application management function 144 manages an application that the receiver 140 has in advance or an application acquired via a communication network. Further, the application management function 144 controls the execution of the application 146 that the receiver 140 has in advance or the application 146 acquired via the communication network via the API 145 that is an application interface (I/F).

The communication control unit 142 has an I/F with a communication network, and can acquire an application or content managed by the service provider apparatus 120 via the communication network.

The display 160 has a speaker 161 built therein, and displays the video signal decoded by the second basic function 141 in the display area and outputs the audio signal to the speaker 161. The speaker 161 built in the display 160 may be an external speaker connected by an I/F such as USB. The display 160 may be built in the receiver 140 or an external display connected to the receiver 140 by an I/F such as HDMI (registered trademark).

FIG. 2 is a diagram schematically showing a main configuration of the broadcasting station 200 (corresponding to 100 in FIG. 1). The broadcasting station 200 generates auxiliary data including control data such as a video encoder 201, an audio encoder 202, a caption encoder 203, and a transmission control signal, service data, and application control information for controlling the application 145 operating in the receiver 140. The attached data generation unit 204 is provided. In the broadcasting station 200, a broadcasting station server 211 (corresponding to 101 in FIG. 1), a first security function 212 (corresponding to 102 in FIG. 1), and a transmitting/receiving unit 213 cooperate with each other. The video encoder 201, the audio encoder 202, the caption encoder 203, the attached data generation unit 204, the multiplexing unit 205, the scrambler 206, the transmitter 207, and the transmission/reception unit 213 are combined to form the first basic function 210 (corresponding to 103 in FIG. 1). ).

The codec type of the video encoder 201 is MPEG-2, H.264. H.264 (MPEG-4
AVC (AVC: Advanced Video Coding), H.264. Any of H.265 (HEVC: High Efficiency Video Coding) may be used. The codec type is not limited to this.

As the multiplexing method, the MPEG-2 Systems multiplexing method or the MMT (Mpeg Media Transport) multiplexing method may be used, or both may be used in combination. Further, the multiplexing method is not limited to this.

The outputs of the video encoder 201, the audio encoder 202, the subtitle encoder 203, and the attached data generation unit 204 are streamed, and these streams are multiplexed by the multiplexing unit 205. The multiplexed stream (broadcast signal) is scrambled by the scrambler 206, sent to the transmitter 207 as a scrambled multiplexed stream, and transmitted from the antenna by broadcast waves.

The transmission control signal generated by the attached data generation unit 204 is configured in a specific format called a table and has an information description area called a descriptor.

FIG. 3 is a diagram showing in detail the configuration of the receiver 300 (corresponding to 140 in FIG. 1) according to an embodiment. The receiver 300 has a second basic function 315 (corresponding to 141 in FIG. 1) that is a reception function for receiving broadcast waves.

The second basic function 315 is a broadcast tuner 301, a descrambler 302, a CAS module 303, a demultiplexer 304, a data broadcast reception processing unit 305, a video decoder 306, an audio decoder 307, a subtitle decoder 308, an analysis unit 309, a data broadcasting engine. Including 310.

The broadcast tuner 301 demodulates a stream (broadcast signal) sent by a broadcast wave. The demodulated stream (broadcast signal) is input to the descrambler 302. The descrambler 302 descrambles the input stream using a key from a CAS (Conditional Access System) module 303. The stream descrambled by the descrambler 302 is input to the demultiplexer 304.

The demultiplexer 304 separates the multiplexed stream into a video stream, an audio stream, a data broadcast stream, a subtitle stream, and attached data, and the video stream is sent to the video decoder 306, the audio stream is sent to the audio decoder 307, and the data broadcast stream. To the data broadcast reception processing unit 305, the subtitle stream to the subtitle decoder 308, and the attached data to the analysis unit 309.

The video stream is decoded by the video decoder 306, the audio stream is decoded by the audio decoder 307, and the subtitle stream is decoded by the subtitle decoder 308.

The control data including application control information, service data, transmission control signal, etc. included in the attached data is analyzed by the analysis unit 309.

Further, the data broadcast stream separated by the demultiplexer 304 is sent to the data broadcast reception processing unit 305, and reception processing is performed. The data broadcast reception processing unit 305 extracts a display signal to be displayed on the display unit 328 as a data broadcast from the data broadcast stream sent from the demultiplexer 304, and inputs the extracted display signal to the data broadcast engine 310. .. The data broadcasting engine 310 analyzes the transmitted display signal and outputs the analyzed content via the synthesizer 326 to the display control unit 327. The display control unit 327 displays the display content on the display 328 (corresponding to 160 in FIG. 1) based on the analysis content of the sent display signal.

The decoded video signal and subtitle signal are combined by the combiner 326 and output to the display 328 via the display controller 327. The display control unit 327 performs gamma characteristic setting, display screen size setting, display signal level setting, and the like.

The audio data decoded by the audio decoder 307 is output to the speaker 329 (corresponding to 161 in FIG. 1).

Although FIG. 3A describes the display 328 and the speaker 329 as an example incorporated in the receiver 300, for example, an external display and speaker connected by an I/F such as HDMI may be used. Good. The display control unit 327 controls the content displayed on the display device 328 even when the display device 328 is an external display device connected to the receiver 300 via an I/F such as HDMI.

The analysis unit 309 analyzes application control information, service data, and control data, and sends the analysis result to the control unit 330 as needed.

The transmission control signal included in the control data includes the channel identification information and the program identification information of the program of the multiplexed video signal, and further provides the application function for the program of the multiplexed video signal. The first specification information indicating that the service to be provided at the same time is added is included. The analysis unit 309 analyzes the received control data to extract the channel identification information, the program identification information, and the first designation information, and transmits the extraction result to the control unit 330 at any time.

Further, the receiver 300 has a control unit 330 as a means for controlling the overall operation. The control unit 330 controls the second security function 322 (corresponding to 143 in FIG. 1), the application management function 323 (corresponding to 144 in FIG. 1), the API 324 (corresponding to 145 in FIG. 1), and the application 325 (146 in FIG. 1). Corresponding to) is included.

The second security function 322 reads information relating to content protection from the transmission control signal included in the broadcast wave, and outputs it to another device (not shown) on the home network via the network I/F 341. , When the content is output to a connected peripheral device (not shown, corresponding to 162 and 170 in FIG. 1), content protection processing is performed. The API 324 is an I/F for the application management function 323 and the application 325 to operate in cooperation with each other.

The application management function 323 manages an application that the receiver 300 has in advance or an application acquired via a communication network. The application management function 323 controls the execution of the application 325 that the receiver 300 has in advance and the application 325 acquired via the communication network via the API 324 that is an application interface (I/F).

The codec type of the video decoder 306 is a broadcast medium received by the broadcast tuner 301, that is, terrestrial digital television broadcast, BS digital broadcast, broadband CS digital broadcast, advanced BS digital broadcast, advanced broadband CS digital broadcast, narrow band CS digital. MPEG-2 (terrestrial digital television broadcasting, BS digital broadcasting, broadband BS digital broadcasting), H.264 as codec types according to received broadcasting such as broadcasting. H.264 (AVC: Advance Video Coding) (narrowband CS digital broadcasting), H.264. Any of H.265 (High Efficiency Video Coding (HEVC) (advanced BS digital broadcasting, advanced broadband CS digital broadcasting) may be used. The codec type is not limited to this. The communication control unit 340 has a network I/F 341 which is an I/F with the communication network 351, and a remote controller I/F 342 which is an I/F with a remote controller (remote controller) 352.

Further, the control unit 330 decrypts the ECM and EMM to the CAS module 303 in order to extract the scramble key (Ks) required for descrambling from the encrypted ECM and EMM sent from the analysis unit 309. Give instructions to do so. The CAS module 303 decrypts the ECM and EMM and extracts the scramble key (Ks) based on an instruction from the control unit 330. Upon extracting the scramble key (Ks), the CAS module 303 transmits the extracted scramble key (Ks) to the control unit 330. Upon receiving the scramble key (Ks) from the CAS module 303, the control unit 330 transmits the received scramble key (Ks) to the descrambler 302. Upon receiving the scramble key (Ks) from the control unit 330, the descrambler 302 sets the received scramble key (Ks) inside. The descrambler 302 descrambles the scrambled broadcast signal using the scramble key (Ks) stored therein.

The process of extracting the scramble key (Ks) required for descrambling will be described in detail with reference to FIGS. 4A and 4B.

FIG. 4A is a conceptual diagram of the conditional access system described in Non-Patent Document 1.

This method is generally called a triple key method, and three keys of a scramble key (Ks) 401, a work key (Kw) 402, and a master key (Km) 403 are used.

The scramble key (Ks) 401, the work key (Kw) 402, and the master key (Km) 403 are keys managed by the broadcasting station 200. The encryption unit 405 that encrypts the ECM using the work key 402 and the encryption unit 406 that encrypts the EMM using the master key 403 are also encryption units managed by the broadcasting station 200.

On the other hand, the CAS module 303 inserted in the receiver 300 includes a decryption unit 425 that decrypts the ECM using the work key 422 and a decryption unit 426 that decrypts the EMM using the master key 423. Is a decryption unit managed by the CAS module 303 inserted in the. The descrambler 420 that descrambles the broadcast wave using the scramble key (Ks) obtained from the CAS module 303 is the descrambler 302 managed by the receiver 300 shown in FIG.

The broadcasting station 200 generates the ECM 410 including the scramble key (Ks) and the EMM 411 including the work key (Kw) at each necessary timing. The broadcasting station 200 multiplexes the generated ECM 410 and EMM 411 with other program contents and the like, scrambles them with the scrambler 400 using the scramble key (Ks) 401 which is sent by the broadcast wave at that time, and scrambles with the broadcast wave. Send.

The receiver 300 descrambles the received broadcast wave by the descrambler 420 using the scramble key (Ks) 421 obtained from the CAS module 303, and provides the user with the program content included in the broadcast wave.

The purpose of the conditional access system is to allow only subscribers who have acquired the right to watch a program broadcast by a specific broadcast station to view the program broadcast by that broadcast station. Therefore, only the subscriber's receiver 300 needs to be able to take out the scramble key (Ks) 421 transmitted by the broadcast wave.

The ECM 410 is related information common to the receivers transmitted by the broadcasting station 200. The ECM 410 contains a scramble key (Ks). The ECM 410 is encrypted by the encryption unit 405 using the work key (Kw) 402.

The EMM 411 is related information of the receiver identification unit (CAS module ID unit) transmitted by the broadcasting station 200. The EMM 411 includes a work key (Kw) 402 used to encrypt the ECM 410. The EMM 411 is encrypted by the encryption unit 406 with the master key (Km) 403. That is, the receiver 300 is installed from the EMM that is the related information of the receiver identification unit (CAS module ID unit) that is associated with the master key (Km) broadcast by the broadcasting station 200 on a one-to-one basis. If the EMM addressed to itself can be recognized by the CAS module ID (card ID) obtained from the module 303, the EMM encrypted using the master key (Km) hidden in the CAS module (IC card) is included in the decryption. The work key (Kw) can be extracted, and the encrypted ECM can be decrypted by using the extracted work key (Kw) to extract the scramble key (Ks) contained therein.

The master key (Km) 423 is stored in a secret state in the CAS module (IC card). The subscriber applies to the broadcasting station for the CAS module ID (card ID) that is the identification information of the CAS module (IC card) 303 when acquiring the right to view the program broadcast by the specific broadcasting station 200. The broadcast station 200 can determine the master key (Km) 423 of the subscriber's CAS module 303 corresponding to the applied CAS module ID (card ID) by a key management system (not shown) that it manages. .. In this way, the broadcasting station 200 can obtain the master key 403 that is the same as the master key 423 of the subscriber's CAS module 303 from the key management system described above.

That is, the broadcasting station 200 can encrypt the EMM 411 by using the master key (Km) 403 with the information CAS module ID (card ID) obtained when applying for the subscriber. Further, the broadcasting station 200 can set the EMM 411 to be transmitted for each subscriber by setting the information of the CAS module ID (card ID) obtained when applying for the subscriber in the non-encrypted part of the EMM 411. it can.

The receiver 300 extracts the EMM 411 addressed to itself from the information of the received CAS module ID (card ID) in the non-encrypted part of the EMM 411, and transmits the extracted EMM 411 addressed to itself to the CAS module 303. The CAS module 303 having received the EMM 411 decrypts the EMM 411 by the decryption unit 426 using the master key (Km) 423 stored in a secret state, and extracts the work key (Kw) 422. Further, the CAS module 303 uses the extracted work key (Kw) 422 to decrypt the ECM 410 with the decryption unit 425, and extracts the scramble key (Ks) 421 included therein. The CAS card module 303 transmits the extracted scramble key (Ks) 421 to the control unit 330. The control unit 330 that has received the scramble key (Ks) 421 transmits the received scramble key (Ks) to the descrambler 420. Upon receiving the scramble key (Ks) from the control unit 330, the descrambler 420 sets the received scramble key (Ks) inside.

The descrambler 420 of the receiver 300 descrambles the broadcast wave received by using the scramble key (Ks) 421 set therein, and provides the user with the program content included in the broadcast wave.

As described above, the broadcasting station 200 sends the ECM having the scramble key (Ks) of the descramble target video prior to the descramble target video.

FIG. 4B is an ECM in the case of terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting, a scramble key (Ks) included therein, and a broadcast descrambled using the scramble key (Ks). It is a figure which shows the time relationship of a signal.

440 is a temporal transition of the broadcast signal of the program received by the receiver 300. Reference numeral 441 indicates a temporal transition of the scramble key (Ks) used to descramble the broadcast signal 440. Ks0, Ks1, and Ks2 are scramble keys (Ks) used to descramble the broadcast signal. The scramble key (Ks) used to descramble the broadcast signal is updated every 2000 ms.

Reference numeral 442 represents a temporal transition of the ECM received by the receiver 300 and the scramble key (Ks) included therein. The ECM1 includes scramble keys Ks0 and Ks1, the ECM2 includes scramble keys Ks1 and Ks2, and the ECM3 includes scramble keys Ks2 and Ks3. Thus, the ECM can store scramble keys (Ks) of both the ODD (odd number) key and the EVEN (even number) key.

As shown in FIG. 4B, the receiver 300 can receive the scramble key (Ks) included in the ECM 1600 ms ahead of the broadcast signal to be descrambled using the scramble key (Ks). Specifically, the broadcast signal in 2000 ms from time T11 to T12 is descrambled using the scramble key Ks2. The scramble key Ks2 is placed in the ECM2 and sent from the broadcasting station 200.

The timing at which the receiver 300 receives this ECM2 is the timing at T20, which precedes T11 by 1600 ms. As described above, the receiver 300 receives the scramble key (Ks) prior to the descramble target broadcast signal, and thus can descramble the received broadcast signal without delay.

In the advanced BS digital broadcasting and the advanced broadband CS digital broadcasting, the time relationship between the ECM and the scramble key (Ks) contained therein and the broadcast signal to be descrambled using the scramble key (Ks) is shown in the figure. The principle is the same if the update cycle of the scramble key (Ks) in 4B is read from 2000 ms to 8000 ms, and the timing of receiving the ECM in advance is read from 1600 ms to 7600 ms.

FIG. 4C is a conceptual diagram of the conditional access system described in Non-Patent Document 2. The conceptual diagram of FIG. 4C is similar to that of FIG. 4A. 4C, 450, 451, 452, 453, 454, 455, 456, 460, 461, 470, 471, 472, 473, 474, 475, 476 are 400, 401, 402, 403, 404, respectively, of FIG. 4A. 405, 406, 410, 411, 420, 421, 422, 423, 424, 425, 426.

In broadcasting, the same signal is sent to all receivers, so if you continue to use the scramble key (Ks) for a long period of time, the scramble method itself is an open method defined by the Ministerial Ordinance, so all keys of the key length It is possible to analyze Ks by brute force and the like. When such a situation occurs, the purpose of conditional access cannot be achieved. Therefore, in the current broadcasting, a scramble key (Ks) that changes with time is used. In Non-Patent Document 1, the use time of the same Ks is set to be about 1 second at the shortest per ECM.

Next, the basic operation of the receiver 300 when descrambling will be described.

FIG. 5 is a basic configuration diagram when the receiver 300 descrambles, described in Non-Patent Document 4.

The receiver 500 includes a tuner unit 501 (corresponding to 301 in FIG. 3), a descrambler 502 (corresponding to 302 in FIG. 3), a TS (Transport Stream) decoding unit 503 (corresponding to 304 in FIG. 3), video/audio decoding. A section 504 (corresponding to 306 and 307 in FIG. 3), a display section 505 (corresponding to 327 in FIG. 3), a control section 506 (corresponding to 330 in FIG. 3), and a key input section 507 (corresponding to 342 in FIG. 3). Including. The TS decoding unit 503 analyzes the transmitted descrambled broadcast signal, sequentially extracts a transmission control signal, and transmits the transmission control signal to the control unit 506. The control unit 506 can control the tuner unit 501, the descrambler 502, and the display unit 505 based on the transmission control signal sent from the TS decoding unit 503. The control unit 506 can also receive an operation input signal from the remote controller 510 via the key input unit 507. The IC card 511 (corresponding to 303 in FIG. 3) is a CAS module capable of performing ECM and EMM processing based on a command given from the control unit 506 and extracting a work key (Kw) and a scramble key (Ks). is there. The receiver 500 of FIG. 5 is a case where one tuner unit is mounted.

FIG. 6 is a processing flowchart of the limited reception processing performed by the receiver 500 shown in FIG. 5 described in Non-Patent Document 1.

When a specific channel (service_id) is selected by the user's operation of the remote controller 510, the control unit 506 determines whether the PMT (Program Map Table) of the service_id is transmitted in the currently received broadcast wave. The PAT (Program Association Table) extracted in 503 is received and determined (S601).

If not transmitted as a result of the determination (No in S603), the control unit 506 refers to the NIT (Network Information Table) transmitted from the TS decode 503 to select the broadcast wave in which the service_id is transmitted. Therefore, the tuner unit 501 is controlled (S610).

The control unit 506 recognizes the PID (Packet Identifier) of the EMM included in the CAT (Conditional Access Table) arranged in the selected broadcast wave, and receives the EMM. The control unit 506 determines the EMM addressed to itself from the received EMMs based on the card ID information set in the non-encrypted portion of the EMM. When the control unit 506 extracts the EMM addressed to itself based on the information of the card ID, the control unit 506 transmits the EMM to the IC card 511. Upon receiving the EMM from the control unit 506, the IC card 511 decrypts the encrypted EMM using the master key (Km) provided therein, extracts the work key (Kw), and stores it (S611).

Further, the control unit 506 refers to the received PAT (S605), receives the PMT of the service_id to be tuned to (S606), recognizes the ECM PID included in the received PMT, and receives the ECM (S607). ). Upon receiving the ECM, the control unit 506 issues an ECM reception command to the IC card 511.

The IC card 511 that has received the ECM reception command decrypts the ECM encrypted using the extracted work key (Kw) and extracts the scramble key (Ks) (S612).

When the IC card 511 normally takes out the scramble key (Ks) (Yes in S612), the IC card 511 transmits the scramble key (Ks) to the control unit 506 as a normal response to the ECM received command.

Upon receiving the scramble key (Ks), the control unit 506 transmits the received scramble key (Ks) to the descrambler 502. The descrambler 502 internally sets the received scramble key (Ks).

The descrambler 502 descrambles the broadcast signal sent from the tuner section 501 using the set scramble key (Ks) at the necessary timing as shown in FIG. 4B (S608).

The video signal and audio signal included in the broadcast signal descrambled by the descrambler 502 are separated by the TS decoding unit 503 and then decoded by the video/audio decoding unit 504 (S609). The decoded video signal and audio signal are output to a monitor and a speaker (not shown).

If the EMM is not received even if the contract is not contracted or contracted, a response indicating the EMM reception such as non-contract is returned from the CAS module (IC card) as a response to the ECM reception command (No in S612). Upon receiving the response, the control unit 506 generates a predetermined error message such as non-contract on the display unit 505 and displays it on the monitor.

Next, a case where the receiver 300 is equipped with two tuner units will be described.

First, the relationship between the update cycle of the ECM and EMM and the processing of the CAS module (IC card) will be described.

As described above, in Non-Patent Document 1, the update cycle of the scramble key (Ks), that is, the update cycle of the ECM is specified to be about 1 second at the shortest.

In other words, considering the maximum processing time, the CAS module (IC card) conforming to Non-Patent Document 1 has a performance capable of processing the ECM and EMM during the update of the scramble key (Ks) for 1 second. (IC card) will be expected.

In order to process a plurality of channels (a plurality of tuners) with one CAS module (IC card) conforming to Non-Patent Document 1, a method of extending the update cycle of the scramble key (Ks) and a CAS module (IC card). It is conceivable to improve the performance of (1) to enable processing of a plurality of ECMs and EMMs within the time of the update cycle of the scramble key (Ks) of 1 second.

In fact, Non-Patent Document 4 explains as follows.

"A-3-2 Update cycle,
The ECM update cycle is described in 5.8.5 ECM update/retransmission in this volume. As the timing according to the processing capability of the IC card, the maximum processing time of 1 ECM is 800 ms, and the update interval of different ECMs is 1000 ms or more. With the revision of version 1.0 of this document, we revised the update cycle assuming the following.・While watching BS broadcasting on the TV screen, BS backside program recording can be processed with one IC card. -The same thing can be processed with one card as an IC card for simultaneous display of any two BS channel screens. From the above, if the ECM update interval is 2000 ms or more, at least two scramble services for different TSs can be processed by one IC card. "
That is, since the CAS module (IC card) conforming to Non-Patent Document 1 can process the update cycle of the scramble key (Ks) of 1 second, by setting the update cycle of the ECM to 2 seconds, at least It becomes possible to process two channels (two tuners).

That is, by setting the update cycle of the ECM to 2 seconds, the CAS module (IC card) conforming to Non-Patent Document 1 allows up to 2 channels (2 tuners) according to the operation regulation regardless of its command response performance. It has been done.

FIG. 7 is a diagram conceptually showing the update cycle of the scramble key (Ks) and the processing of ECM and EMM.

701 represents the expected processing time of ECM and EMM for a CAS module (IC card) conforming to Non-Patent Document 1. The CAS module (IC card) conforming to Non-Patent Document 1 is expected to complete processing of one ECM and EMM within 1000 ms.

Reference numeral 702 denotes a state of ECM and EMM processing when a CAS module (IC card) conforming to Non-Patent Document 4 is inserted into a receiver having two tuner units (first tuner unit 1 and second tuner unit). Is shown. Reference numeral 702-1 shows the state of ECM and EMM processing for the first tuner section, and 702-2 shows the state of ECM and EMM processing for the second tuner section.

When there are two tuners, the CAS module (IC card) serially performs the ECM processing and the EMM processing included in the broadcast wave received by each tuner according to the command from the receiver. The processing of the ECM and EMM for the first tuner and the processing of the ECM and EMM for the second tuner must be performed within 2 seconds, which is the update cycle of the scramble key (Ks).

FIG. 8 is a basic configuration diagram of a receiver 800 when descrambling a broadcast wave when it has two tuner units, in contrast to the basic configuration of a receiver when it has one tuner unit shown in FIG. Is. The difference between FIG. 8 and FIG. 5 is that one tuner unit is added and the tuner unit is composed of a first tuner unit 801-1 and a second tuner unit 801-2. A device 813 is added and a built-in recording/recording unit 812 is added. Other than that, 802 to 810 and 811 are the same as 502 to 510 and 511 of FIG.

The receiver 800 has two tuner sections, a first tuner section 801-1 and a second tuner section 801-2, so that the program selected by one tuner section is output to the monitor, and at the same time, another tuner section is output. It is possible to record a program different from the program output to the monitor, which was selected in step 1, and save it in the recording/recording unit 812. The recording/recording unit 812 is, for example, a built-in HDD (hard disk drive).

Processing when channel 1 broadcast wave to be output to monitor is selected by first tuner section 801-1 and channel 2 broadcast wave to be recorded by recording/recording section 812 is simultaneously selected by second tuner section 801-2 Will be explained.

When the user operates the remote controller 810 to select the channel 1 (service_id_1) to be output to the monitor, the control unit 806 uses the TS decoding unit 803 to extract whether the PMT of service_id_1 is transmitted in the currently received broadcast wave. The received PAT is received and judged.

If not transmitted as a result of the determination, the control unit 806 controls the first tuner unit 801-1 to select the broadcast wave in which service_id_1 is transmitted by referring to the NIT sent from the TS decoding unit 503. To do.

The control unit 806 recognizes the PID of the EMM included in the CAT arranged in the selected broadcast wave and receives the EMM. The control unit 806 determines the EMM addressed to itself from the received EMMs based on the card ID information set in the non-encrypted portion of the EMM. When the control unit 806 extracts the EMM addressed to itself based on the card ID information, the control unit 806 transmits the EMM to the IC card 811. The IC card 811 that has received the EMM from the control unit 806 decrypts the encrypted EMM using the master key (Km) that it has, extracts the work key (Kw), and stores it.

The control unit 806 also refers to the received PAT to receive the PMT of service_id_1 desired to be selected, recognizes the ECM PID included in the received PMT, and receives the ECM. Upon receiving the ECM, the control unit 806 issues an ECM reception command to the IC card 811.

The IC card 811 that has received the ECM reception command decrypts the ECM encrypted using the extracted work key (Kw) and extracts the scramble key (Ks).

When the IC card 811 normally extracts the scramble key (Ks), the IC card 811 transmits the scramble key (Ks) to the control unit 806 as a normal response to the ECM received command.

Upon receiving the scramble key (Ks), the control unit 806 transmits the received scramble key (Ks) to the descrambler 802. The descrambler 802 internally sets the received scramble key (Ks).

The descrambler 802 descrambles the broadcast signal sent from the first tuner unit 801-1 by using the set scramble key (Ks) at the necessary timing as shown in FIG. 4B.

The video signal and the audio signal included in the broadcast signal descrambled by the descrambler 802 are separated by the TS decoding unit 803 and then decoded by the video/audio decoding unit 804. The decoded video signal and audio signal are output to a monitor and a speaker (not shown).

In the reserved recording, the user makes a recording reservation of a desired program using an electronic program guide (EPG, not shown) or the like. The control unit 806 controls the second tuner unit 801-2 according to the setting contents of the recording reservation to control the second tuner unit 801-2 when it comes close to the start time of the recording-reserved program, and selects the channel for which the recording reservation is made.

The control unit 806 recognizes the PID of the EMM included in the CAT arranged in the selected broadcast wave and receives the EMM. The control unit 806 determines the EMM addressed to itself from the received EMMs based on the card ID information set in the non-encrypted portion of the EMM. When the control unit 806 extracts the EMM addressed to itself based on the card ID information, the control unit 806 transmits the EMM to the IC card 811. The IC card 811 that has received the EMM from the control unit 806 decrypts the encrypted EMM using the master key (Km) that it has, extracts the work key (Kw), and stores it.

Further, the control unit 806 refers to the PAT, receives the PMT of the service_id_2 desired to be selected, recognizes the ECM PID included in the received PMT, and receives the ECM. Upon receiving the ECM, the control unit 806 issues an ECM reception command to the IC card 811.

The IC card 811 is one IC card (one CAS module) and is processed by the ECM included in the broadcast wave selected by the first tuner unit 801-1 and selected by the second tuner unit 801-2. It is necessary to perform both processes of the ECM included in the broadcast wave.

The processing of the IC card 811 is started in response to a request from the receiver, but data exchange between the control unit 806 and the IC card 811 is performed in response to a request from the control unit 806 to the IC card 811. The rule is that the control unit 806 cannot send the next request to the IC card 811 until the IC card 811 returns a response to the control unit 806.

Therefore, when the ECMs are continuously received from the TS decoding unit, the control unit 806 adjusts the timing for requesting the ECM processing in consideration of the ECM retransmission cycle and the like, and issues the ECM reception command requesting the processing. To do.

Similarly, in the EMM processing, the IC card 811 includes the EMM processing included in the broadcast wave selected by the first tuner section 801-1 and the broadcast wave selected by the second tuner section 801-2. Since it is necessary to perform both processes of the EMM processing performed by the EMM, the control unit 806 adjusts the timing of requesting the processing of each EMM so as not to overlap the timing of requesting the processing of the ECM, and then controls the IC card 811. In response, issue a command.

At the time of processing the ECM included in the broadcast wave selected by the first tuner unit 801-1, the IC card 811 has already received the contracted EMM, and the work key (Kw ) Has been extracted, the work key (Kw) can be used to decrypt the EMC requested to be processed to extract the scramble key (Ks). When the IC card 811 can decrypt the EMC and extract the scramble key (Ks), the IC card 811 sends the scramble key (Ks) to the control unit 806 as a normal response to the ECM received command to the control unit 811.

Upon receiving the scramble key (Ks), the control unit 806 transmits the received scramble key (Ks) to the descrambler 802. The descrambler 802 internally sets the received scramble key (Ks). The descrambler 802 descrambles the broadcast wave selected by the second tuner unit 801-2 by using the set scramble key (Ks). The descrambled broadcast wave is decoded by the TS decoding unit 803, converted into a predetermined recording format (for example, a TS format encrypted with a unique key for device binding) and recorded in the recording/recording unit 812.

When reproducing the recorded program stored in the recording/recording unit 821, the recording format stored in the recording/recording unit 821 is returned to the format decoded by the TS decoding unit 803, and the video/audio decoding is performed. Output to the monitor in the unit 804.

Furthermore, the receiver can be equipped with three or more tuners.

When the receiver is equipped with three or more tuners, for example, when it corresponds to a so-called W back-recording function that can record two different channels at the same time other than the program being viewed, the ECM processing and the EMM processing become complicated. Become.

If one CAS module (IC card) can handle up to 2 channels, and if three tuners are processed reliably, it is necessary to mount two CAS modules (IC cards).

FIG. 9 is a basic configuration diagram of a receiver 900 when descrambling a broadcast wave when it has three tuners, in contrast to the basic configuration of a receiver when it has two tuners shown in FIG. ..

The difference between FIG. 9 and FIG. 8 is that a third tuner section 901-3 is added and that one IC card is added to the first IC card 911-1 and the second IC card 911-2. That is the point. Other than that, 902 to 910 and 912 are the same as 802 to 810 and 812 in FIG.

The broadcast wave of channel 1 to be output to the monitor is selected by the first tuner section 901-1, and at the same time, the broadcast wave of channel 2 to be recorded by the recording/recording section 912 is selected by the second tuner section 901-2 and simultaneously recorded. The process when the third tuner unit 901-3 tunes to the broadcast wave of channel 3 recorded by the recording unit 912 will be described.

When the user operates the remote controller 810 to select the channel 1 (service_id_1) to be output to the monitor, the control unit 906 extracts in the TS decoding unit 903 whether the PMT of the service_id_1 is transmitted in the currently received broadcast wave. The received PAT is received and judged.

If not transmitted as a result of the determination, the control unit 906 controls the first tuner unit 901-1 in order to select the broadcast wave transmitting the service_id_1 by referring to the NIT sent from the TS decoding unit 903. To do.

The control unit 906 recognizes the PID of the EMM included in the CAT placed in the selected broadcast wave and receives the EMM. The control unit 906 determines the EMM addressed to itself from the received EMMs based on the card ID information set in the non-encrypted part of the EMM. When the control unit 906 extracts the EMM addressed to itself based on the information of the card ID, the control unit 906 transmits the EMM to the predetermined first IC card 911-1 or second IC card 911-2. The first IC card 911-1 or the second IC card 911-2, which has received the EMM from the control unit 906, decrypts the encrypted EMM using the master key (Km) provided therein and extracts the work key (Kw). And save.

Further, the control unit 906 refers to the received PAT, receives the PMT of service_id_1 desired to be tuned, recognizes the ECM PID included in the received PMT, and receives the ECM. Upon receiving the ECM, the control unit 906 issues an ECM reception command to a predetermined first IC card 911-1 or second IC card 911-2.

The first IC card 911-1 or the second IC card 911-2, which has received the ECM reception command, decrypts the ECM encrypted using the extracted work key (Kw) and extracts the scramble key (Ks).

When the first IC card 911-1 or the second IC card 911-2 normally takes out the scramble key (Ks), it sends the scramble key (Ks) to the control unit 906 as a normal response to the ECM received command.

Upon receiving the scramble key (Ks), the control unit 906 transmits the received scramble key (Ks) to the descrambler 902. The descrambler 902 internally sets the received scramble key (Ks). The descrambler 902 descrambles the broadcast signal sent from the first tuner unit 901-1 by using the set scramble key (Ks) at the necessary timing as shown in FIG. 4B.

The video signal and the audio signal included in the broadcast signal descrambled by the descrambler 902 are separated by the TS decoding unit 903 and then decoded by the video/audio decoding unit 904. The decoded video signal and audio signal are output to a monitor and a speaker (not shown).

In the reserved recording, the user makes a recording reservation of a desired program on two different channels at the same time using an electronic program guide (EPG, not shown) or the like, and the control unit 906 follows the setting content of the recording reservation for the program. When the time is near the start time, the second tuner unit 901-2 and the third tuner unit 901-3 are controlled to select the channel for which the recording reservation is made.

The control unit 906 recognizes the PID of the EMM and receives the EMM because it is included in the CAT arranged in the selected broadcast wave. The control unit 906 determines the EMM addressed to itself from the received EMMs based on the card ID information set in the non-encrypted part of the EMM. When the control unit 906 extracts the EMM addressed to itself based on the information of the card ID, the control unit 906 transmits the EMM to the predetermined first IC card 911-1 or second IC card 911-2. The first IC card 911-1 or the second IC card 911-2, which has received the EMM from the control unit 906, decrypts the encrypted EMM using the master key (Km) provided therein and extracts the work key (Kw). And save.

Further, the control unit 906 refers to the PAT, receives the PMT of the service_id_2 desired to be selected, recognizes the ECM PID included in the received PMT, and receives the ECM. Upon receiving the ECM, the control unit 906 issues an ECM reception command to a predetermined first IC card 911-1 or second IC card 911-2.

As for the IC cards 911-1 and 911-2, since simultaneous processing of up to two channels is guaranteed by one IC card according to the operation regulation, the first tuner unit 901-1, the second tuner unit 901-2, It is necessary to set the correspondence between the third tuner unit 901-3 and the first IC card 911-1 and the second IC card 911-2, which are CAS modules that perform CAS processing, on a setting screen such as a user interface. Yes (not shown).

For example, the first tuner unit 901-1 and the second tuner unit 901-2 are associated with each other such that the first IC card 911-1 processes the third tuner unit 901-3 and the second IC card 911-2 processes the third tuner unit 901-3. I shall. In this case, a subscription contract is made to acquire the right to watch channels A, B, and C provided as pay broadcast by the information of the card ID of the first IC card 911-1, and the card ID of the second IC card 911-2. When a subscription contract is made in order to acquire the right to view channels D, E, and F provided as pay broadcasting with the information of, for example, channel A and F are simultaneously recorded while watching channel C. The first tuner unit 901-1 selects channel C, the second tuner unit 901-2 selects channel A, and the third tuner unit 901-3 selects channel F. Correspondence between the channels and the first IC card 911-1 and the second IC card 911-2 can be established.

However, when the third tuner unit 901-3 attempts to process the broadcast wave of the channel A, the second IC card 911-2 does not have a contract to view the broadcast wave of the channel A, so the second IC card In 911-2, the EMM including the contract information for viewing the channel A cannot be extracted, and as a result, the broadcast wave of the channel A cannot be descrambled. Further, when one IC card (CAS module) contracts with three different channels (for example, channels A, B, and C) to receive EMM, one of these three channels is not viewed at different times. Although it is possible to record, it is possible to simultaneously record channels B and C while watching channel A. However, as described above, as described in Non-Patent Document 4, if one IC card can perform simultaneous processing up to TS processing of two channels (tuners) at the same time, one IC cannot be processed. There is a problem that the card cannot process TSs of three different channels at the same time.

Therefore, the present embodiment focuses on the following as main points.

In the present embodiment, in a receiver equipped with a plurality of tuners for the convenience of the user, the number of the tuners and the IC cards associated with each other is reduced as much as possible in order to reduce the burden on the user and the cost reduction. Create rules to enable processing with an IC card (CAS module).

Therefore, for example, it is important that the number of tuners that can perform simultaneous reception processing can be strictly examined even with one CAS module (IC card).

In this embodiment, one business entity newly sets one card ID in consideration of the ECM retransmission cycle, update cycle, command response performance described in the specifications of the CAS module (IC card), and the like. It defines the frequency of transmitting EMMs or the number of EMMs that a receiver should process within a certain period per business entity. In other words, what is newly specified is the number of EMMs to be processed within a certain period. Whether to specify the number of transmissions within a certain period as a transmission rule or the number of processings within a certain period as a receiver rule. Is a means of. As a result, it becomes possible to strictly examine how many tuners can perform the simultaneous reception processing with one CAS module (IC card). As a result, the convenience of the receiver manufacturer can be obtained.

The summary of the main points of this embodiment can be described as follows.
(1). In broadcasts that operate access control methods (conditional access method or content protection method), EMM retransmission cycle, update cycle, and EMM and/or EMM individual message sent to the same receiver (CAS module ID) per entity A digital broadcast transmitter/receiver that specifies the transmission frequency of.

(1b). Among EMM and/or EMM individual messages sent to one CAS module ID, digital that defines the minimum number of EMMs that need to be processed in the grace period from the reception of the EMM to the issuance of the command to the CAS module. Broadcast transmitter and receiver.

(2). In broadcasts that operate access control methods (conditional access method or content protection method), when more than two reception/viewing or recording/recording are performed at the same time, the ECM retransmission cycle, update cycle, and the same reception per business entity Frequency is set for the EMM and/or EMM individual message to be sent to the device (CAS module ID), and there is a grace period from the reception of the EMM and/or EMM individual message to the receiver until the command is issued to the CAS module. A digital broadcast receiving apparatus for controlling an issuance schedule of EMM and/or EMM individual message processing of each of a plurality of tuners mounted in a period to the CAS module based on the EMM and/or EMM individual message transmission frequency.

(2b). In broadcasts that operate access control methods (conditional access method or content protection method), when more than two reception/viewing or recording/recording are performed at the same time, the ECM retransmission cycle, update cycle, and the same reception per business entity The number of EMM and/or EMM individual messages that need to be processed during the grace period from receiving the EMM and/or EMM individual message sent to the machine (CAS module ID) to issuing the command to the CAS module. A digital broadcast receiving device that controls an issuing schedule.

(3). In broadcasts that operate access control methods (conditional access method or content protection method), send EMM and/or EMM individual message sent to the same receiver (CAS module ID) per entity at a predetermined frequency A digital broadcast transmission device that is controlled so as to.

(4). Above (1). In the content described in, the transmission frequency of EMM and/or EMM individual message addressed to one CAS module ID is defined by the number of EMMs to be transmitted in the grace period from the reception of the EMM to the command issuance to the CAS module. Broadcast transmitter and receiver.

(5). Above (1). In the contents described in (1), the digital broadcast transmission/reception device which defines the transmission frequency of EMM and/or EMM individual messages addressed to one CAS module ID by the number of EMM and/or EMM individual messages transmitted per ECM or scramble key update period.

(6). Above (1). The transmission frequency of the EMM and/or EMM individual message addressed to one CAS ID is transmitted in the grace period from the reception of the EMM and/or EMM individual message to the issuing of the command to the CAS module. A digital broadcast transmitter/receiver device defined by the number of EMMs and/or EMM individual messages to be transmitted and the number of EMMs and/or EMM individual messages transmitted per ECM or scramble key update period.

(7). Above (2). In the content described in, the EMM that controls the issuance schedule to the CAS module is transmitted during the grace period from the reception of the EMM and/or the EMM individual message addressed to the CAS module to the issuance of the command to the CAS module. And/or a digital broadcast receiving apparatus controlled by the number of EMM individual messages.

(8). Above (2). In the content described in, the control of the issue schedule to the CAS module is controlled by the ECM or scramble in the grace period from the reception of the EMM and/or the EMM individual message addressed to the CAS module to the issue of the command to the CAS module. A digital broadcast receiving apparatus that controls by the number of EMMs and/or EMM individual messages transmitted per key update cycle.

(9). Above (2). In the content described in, the control of the issuance schedule to the CAS module is controlled by the EMM to be transmitted during the grace period from the reception of the EMM and/or the EMM individual message addressed to the CAS module to the issuance of the command to the CAS module. A digital broadcast receiving apparatus that controls the number of EMMs and/or the number of EMM individual messages sent per ECM or scramble key update period.

(10). (3) above. In the content described in, the transmission frequency of the EMM/EMM individual message transmitted to the same receiver is set from the time when the EMM and/or the EMM individual message addressed to the CAS module is received until the command is issued to the CAS module. A digital broadcast transmission device that controls the number of EMMs and/or EMM individual messages to be transmitted during a grace period.

(11). (3) above. In the content described in (1), a digital broadcast transmission device that controls the transmission frequency of EMMs and/or EMM individual messages transmitted to the same receiver by the number of EMMs and/or EMM individual messages transmitted per ECM or scramble key update cycle.

(12). (3) above. In the content described in, the transmission frequency of EMM and/or EMM individual message transmitted to the same receiver is set as a grace period from the reception of the EMM/EMM individual message addressed to the CAS module to the issuance of the command to the CAS module. A digital broadcast transmission device that controls by the number of EMMs to be transmitted during a period and the number of EMMs and/or EMM individual messages transmitted per ECM or scramble key update period.

Next, it will be explained from the background that the present embodiment exerts a useful function.

According to the conventional standards and operation regulations, the following needs to be considered in order to enable simultaneous processing of two different tuners in one CAS module (IC card). Therefore, when assuming a receiver equipped with 3 tuners or more, in addition to the conventional standard and operation standard, the command and the command with the CAS module (IC card) such as ECM or EMM of the CAS module (IC card) to be mounted. It is necessary to understand the performance required for response.

However, even if the command response performance of the ECM or EMM of this CAS module (IC card), the transmission frequency of the ECM, the update cycle, and the grace period until the post-reception processing of the EMM are determined, exactly how many tuner processes are possible. It is difficult to study in detail.

Generally, since the ECM is updated every few seconds, even if the retransmission cycle is sent every 100 ms, the ECM processing must be prioritized when a plurality of tuners are installed.

On the other hand, the EMM has an attribute that does not require immediate processing as compared with the ECM, but in some cases, the processing is not as immediate as the ECM, but may require processing as quickly as possible. For example, (a) a viewer A who wants to obtain the right to watch a program broadcast by a specific broadcasting station (business), performs procedures regarding joining and troubles at the time of joining, and the customer center Call the user, select the channel of the broadcasting station with his/her own receiver according to the guidance of the telephone, and give the card ID number of the receiver of the viewer A (b) The viewer A keeps dialing In the state, the broadcasting station (entity) immediately transmits the EMM in which the card ID number notified by telephone is set. (c) The receiver of the viewer A receives the EMM, and the scramble key (Ks) can be taken out. For example, it becomes possible to descramble the broadcast signal of the channel (so-called unlocking is possible) (d) As a result, the viewer A can confirm the completion of the contract procedure.
In the case of the scenes (a) to (d), the EMM processing is not as immediate as the ECM, but in reality, it may be necessary to perform the processing as quickly as possible.

In this way, when the business entity and the viewer make a phone call and the viewer performs the viewing contract procedure while confirming the reception state of the receiver, the receiver may miss the EMM reception. Therefore, it is also assumed that the broadcasting station (entity) transmits the EMMs with the same card ID set in bursts for a certain period of time, assuming that the receiver misses the reception of the EMMs.

The ECM may control the reception of the ECM so that the receiver receives at least one within the period in which the same Ks is used in accordance with the update of the scramble key (Ks). The receiver does not control the reception of the EMM and receives all the EMMs sent to itself and sends all the received EMMs to the CAS module (IC card) to request processing. It is considered to be the basic thing to do.

Therefore, it is desired that the receiver process the CAS module (IC card) with a certain period of time after receiving the EMM. Therefore, in the ARIB standard, in addition to the response performance of the CAS module (IC card) being shown by the CAS module provider, an EMM receive command is issued to the CAS module (IC card) after the receiver receives the EMM. The grace period before doing was stipulated.

According to this stipulation, EMMs are unlikely to cause problems so much on the assumption that they are sent to the same CAS module (IC card) less frequently, but as mentioned above, when a key is opened by telephone, It is also envisaged to send multiple EMMs in a short time.

Recently, the number of tuners installed has increased, and receivers equipped with a multi-channel recording function, and CAS for advanced broadband BS/CS broadcasting (so-called 4K8K broadcasting) in Appendix 7 of Part 1 Part 5 of Non-Patent Document 5 have been added. The provisions have been made that the existing broadband satellite broadcasting (so-called 2K broadcasting) CAS may be installed in an integrated CAS module.

The following is described in Appendix 7,
"Appendix 7 Shared receiver for current broadcasting and advanced BS digital broadcasting Reception of advanced BS digital broadcasting and BS digital broadcasting/broadband CS digital broadcasting defined in ARIB TR-B15 or terrestrial digital television defined in ARIB TR-B14 The following is the provision for applying the same CAS module to the reception of BS digital broadcasting/broadband CS digital broadcasting and terrestrial digital television broadcasting during shared reception in which at least one of the John broadcasting can be received. ..

However, if the number of tuners installed in a receiver that receives the current wideband satellite broadcast (so-called 2K broadcast) is large, or if the receiver that receives the advanced broadband satellite broadcast (so-called 4K8K broadcast) and the current broadcast (so-called 2K broadcast) is available. There may be a case where one CAS module (IC card) receives and processes a large number of channels in the future.

Under such circumstances, the difference in the update cycle of ECM (scramble key (Ks)) between Non-Patent Document 5, Non-Patent Document 3 and Non-Patent Document 4, and the high-bandwidth satellite broadcasting (so-called 4K8K) and current broadcasting When the ECM or EMM response performance is different from that of (so-called 2K), it is essential to consider strict timing control regarding the processing of the ECM or EMM in the receiver.

However, it is difficult to study the timing control related to the processing of ECM and EMM in order to obtain a receiver that is compatible with various broadcasting systems and has a large number of tuners based only on the current regulations regarding EMM.

Therefore, in the present embodiment, by defining the transmission frequency of the EMM as described in (1) to (12) above, for example, it becomes possible to strictly set the reception processing timing of the ECM and the EMM, and to mount it. It is possible to determine the specifications of the number of tuners and prevent unexpected failures such as missing EMMs.

In the conditional access system with the triple key structure shown in FIG. 4A, in addition to the technical specifications of the sending side that the update period of the ECM is 2000 ms and the resending period is 100 ms, “EMM has one CAS module ID per business unit”. On the other hand, it is assumed that the content of the regulation that "one is transmitted in 30 seconds" is newly added.

FIG. 10 is a diagram showing the temporal relationship between ECM, EMM, and scramble key (Ks) in the conditional access system.

Under the above conditions, since the ECM update is 2000 ms, the key (Ks) for scrambling the broadcast program is also updated in 2000 ms.

Details of the temporal relationship between the scramble key (ks) included in the ECM and the scramble key (ks) that descrambles the broadcast signal using the included scramble key (Ks) are shown in FIG. 4B. On the street.

FIG. 11 shows the timing when the transmission side transmits the ECM including the scramble key (Ks) and the descrambling using the scramble key (Ks) included in the ECM, which is described in Non-Patent Document 3, Part 5, 5.8-1. 7 illustrates a timing of transmitting a video signal to be performed. The horizontal axis is the time axis.

The transmitting side is, for example, a broadcasting station. Reference numeral 1101 indicates a temporal transition in which the ECM including the scramble key (Ks) is transmitted. Reference numeral 1102 indicates a temporal transition of a video signal descrambled by using a scramble key (Ks) included in the ECM.

The section of T1+T2 is a section in which the same ECM is transmitted. The section T3 is a section in which the video signal descrambled using the scramble key (Ks) included in the ECM sent in the section T1+T2 is transmitted. The ECM including the scramble key (Ks) is transmitted from the broadcasting station T1 (=1600 ms) ahead of the video signal descrambled using the scramble key (Ks) included in the ECM.

An implementation example of conditional access of the receiver in the transmission/reception system according to the transmission rule shown in FIG. 11 is shown below.

FIG. 12 is an implementation example of conditional access of a receiver in a transmission/reception system according to the transmission rule shown in FIG. 1201 is a time transition of the received program. The received program 1201 is scrambled with Ks0 from time T11, Ks1 from time T11 to T12, Ks2 from time T12 to T13, and Ks3 from time T13 to T14. It indicates that

1202 is a temporal transition of the received ECM. The ECM2 is received at the timing of time T21, and it is shown that the ECM includes the scramble key (Ks) Ks1 and Ks2. The receiver is watching the program at time T21. It receives the ECM2 and issues a command to the CAS module (IC card). The CAS module (IC card) completes the ECM processing during the time from section T21 to section T12. The CAS module (IC card) transmits the scramble key Ks2 obtained by the ECM processing to the receiver, and the receiver sets the scramble key Ks2 in the descrambler of the MULTI2 system, and the scrambled program using Ks2 from time T12 Descramble.

Further, when switching from another channel between the sections T22 and T13, the receiver receives the ECM3 and issues a command to the CAS module (IC card).

The receiver enables descrambling by obtaining Ks3 transmitted by ECM3 as a response from the CAS module (IC card).

As shown in FIG. 7, the CAS module (IC card) conforming to Non-Patent Document 1 is expected to be capable of the total value of ECM and EMM processing within 1000 ms.

As the performance of the CAS module (IC card) mounted on the receiver, for example, when the ECM processing time is 385 ms and the EMM processing time is 500 ms, how many tuners can be processed by one CAS module (IC card)? It will be possible after the following examination.

Assuming that the EMM addressed to the own receiver is received between the sections T21 and T12, the EMM processing is not performed at the time of T21, so the receiver processes four ECMs at 1600 ms between the sections T21 and T12. It is possible (case 1 in FIG. 12).

That is, in this state only, it seems that the CAS module (IC card) can process up to 4 tuners.

Next, if the receiver starts the processing of the EMM received during the time T21 to T12 from the time T12, the CAS module (IC card) requires 500 ms for the processing of the EMM, so the receiver receives the CAS module ( The timing of receiving the notification of the completion of processing of the four ECMs from the IC card) exceeds the time of the time T22 at which the descrambling is started using the next scramble key Ks3 by 100 ms. In other words, when the receiver starts the processing of the timing EMM of T12, the processing is 1500 ms until T13 which has to finish the processing of ECM, and can process only three ECMs (case 2 in FIG. 12).

Next, when the receiver receives the EMM at T23, which is the update timing of the ECM, and starts processing, there is 1100 ms remaining between the sections T23 and T14, and up to two ECMs can be processed (FIG. 12). Case 3). In other words, under the above assumptions, it is possible to consider that the number of tuners that can be processed by one CAS module (IC card) is two.

The above is an example of the performance of the CAS module (IC card) and the EMM transmission frequency per business unit during the EMM processing grace period. Next, an embodiment will be described in which one CAS module (IC card) processes more than two tuners in the receiver.

FIG. 13 shows an increase in the number of tuner units to three and a recording/recording unit to the basic configuration of the receiver shown in FIG. 4.1-1 of the fifth edition of Non-Patent Document 4 shown in FIG. It is the added block diagram.

The difference between FIG. 13 and FIG. 5 is that two tuner units are added and the tuner unit is composed of a first tuner unit 1301-1, a second tuner unit 1301-2, and a third tuner unit 1301-3. The point is that a distributor 1313 is added to correspond to the set and the built-in recording/recording unit 1312 is added. Other than that, it is the same as 1302 to 1311 and 502 to 511 of FIG.

The three tuners may be terrestrial digital television broadcasts, BS digital broadcasts, broadband CS digital broadcasts, or tuners capable of selecting three waves, and any three channels can be viewed or recorded as the specifications of the receiver.・Recordable.

It is assumed that one IC card 1311 (CAS module) used here has the response performance of ECM and EMM capable of processing three tuners. For example, regarding the response performance of the IC card 1311, the response performance of the ECM is 300 ms and the response performance of the EMM is 500 ms. It is assumed that the receiver 1300 transmits one EMM per business entity to the IC card 1311 after receiving the EMM within the grace period in which the EMM processing is required.

FIG. 14 is an implementation example of conditional access of the receiver having the basic configuration shown in FIG.

1401 is a temporal transition of the received program. The received program 1401 is scrambled with Ks0 from time T11, Ks1 from time T11 to T12, Ks2 from time T12 to T13, and Ks3 from time T13 to T14. It indicates that 1402 is a temporal transition of the received ECM.

In the example of FIG. 14, during the 1600 ms from the time of the ECM update timing T21 including Ks2 to T12 when the scramble key of the broadcast content is switched to Ks2, the first tuner unit 1301-1 which is the three tuners of FIG. The ECM of each channel selected by the second tuner unit 1301-2 and the third tuner unit 1301-3 and the EMM of at least one channel can be processed.

As shown in FIG. 14, the EMM received by the first tuner unit 1301-1 is processed between times T21 and T12, and the EMM received by the second tuner unit 1301-2 is processed between times T22 and T13. The EMM received by the third tuner unit 13010-3 may be processed between times T23 and T14. In other words, in this example, the total of the ECM and EMM processing times of the IC card 1311 is (ECM response processing time=300 ms)×(3 tuners)+(EMM response processing time=500 ms)=1400 ms≦1600 ms. It can be processed for three tuners.

In the receiver shown in FIG. 13, a case where two different programs are recorded (so-called W endorsement) while watching a certain broadcast will be described as a use case.

When channel 1 (service_id_1) is selected by the user's operation of the remote controller 1310, the control unit 1306 determines whether the PMT of the service_id is transmitted in the currently received broadcast wave by the PAT reception extracted by the TS decoding unit 1303. And judge.

If not transmitted as a result of the determination, the control unit 1306 refers to the NIT sent from the TS decoding unit 1303 to select the broadcast wave in which the service_id_1 is transmitted, and thus the first tuner unit 1301-1 is set. Control.

The control unit 1306 recognizes the PID of the EMM from the CAT arranged in the broadcast wave selected by the first tuner unit 1301-1 and receives the EMM. The control unit 1306 determines the EMM addressed to itself from the received EMMs based on the card ID information set in the non-encrypted portion of the EMM. When the control unit 1306 extracts the EMM addressed to itself based on the information of the card ID, the control unit 1306 transmits the EMM to the IC card 1311.

The control unit 1306 sends the EMM to the IC card 1311 at the timing shown in FIG. The control unit 1306 temporarily stores the received EMM until the appropriate timing to send the EMM to the IC card 1311.

The IC card 1311 that has received the EMM from the control unit 1306 decrypts the encrypted EMM using the master key (Km) that it has, extracts the work key (Kw), and stores it.

Further, by using a program guide (not shown) in advance by a user operation, two channels different from the channel selected by the first tuner unit 1301-1 and being output to the monitor are scheduled to be broadcast in the same time zone. Schedule recording of programs A and B.

When making a recording reservation, the control unit 1306 sets at least the service_id of the reservation target program, the program start time (including date and time), the end time, or the broadcast duration from the program start in a memory area (not shown) for schedule management of the recorded program. ). The control unit 1306 performs schedule management such that the program A is selected by the second tuner unit 1301-2 and the program B is selected by the third tuner unit 1301-3 for recording reservations of two different channels. The procedure for acquiring the EMM for the programs selected by the second tuner unit 1301-2 and the third tuner unit 1301-3 is the same as that of the first tuner unit 1301-1.

The channel selected by the remote controller 1310 is selected by the first tuner unit 1301-1. The control unit 1306 refers to the PAT of the broadcast wave of the program selected by the first tuner unit 1301-1, receives the PMT of the service_id_1 desired to be selected, recognizes the ECM PID, and receives the ECM. Upon receiving the ECM, the control unit 1306 issues an ECM reception command to the IC card 1311.

If the IC card 1311 that has received the ECM has already received the contracted EMM and extracted the work key (Kw), it transmits the scramble key (Ks) to the control unit 1306 as a normal response. Upon receiving the scramble key (Ks), the control unit 1306 transmits the received scramble key (Ks) to the descrambler 1302. The descrambler 1302 internally sets the received scramble key (Ks).

The descrambler 1302 descrambles the broadcast signal corresponding to the ECM that has transmitted the scramble key (Ks) using the set scramble key (Ks) and sends it to the TS decoding unit 1303. Upon receiving the descrambled broadcast signal, the TS decoding unit 1303 extracts a predetermined video and audio signal according to the PID of the video or audio ES of the selected channel, and sends it to the video/audio decoding unit 1304. The video/audio decoding unit 1304 decodes the sent video and audio signals and outputs them to the monitor 14 and a speaker (not shown).

The reserved recording is performed by the user for a desired program using an electronic program guide (EPG, not shown) or the like. The control unit 1306 controls the second tuner unit 1301-2 at the time when it comes close to the start time of the program A for which the recording reservation is made, according to the setting contents of the recording reservation, and selects the channel for which the recording reservation is made.

The control unit 1306 receives the PAT extracted by the TS decoding unit 1303 and determines whether or not the PMT of service_id_2 of the program A is transmitted in the currently received broadcast wave.

If not transmitted as a result of the determination, the control unit 1306 refers to the NIT sent from the TS decoding unit 1303 to select the broadcast wave in which the service_id_2 of the program A is transmitted, and thus the second tuner unit 1301- Control 2

The control unit 1306 recognizes the PID of the EMM included in the CAT arranged in the broadcast wave selected by the second tuner unit 1301-2 and receives the EMM. The control unit 1306 determines the EMM addressed to itself from the received EMMs based on the card ID information set in the non-encrypted portion of the EMM. When the control unit 1306 extracts the EMM addressed to itself based on the information of the card ID, the control unit 1306 transmits the EMM to the IC card 1311. The IC card 1311 that has received the EMM from the control unit 1306 decrypts the encrypted EMM using the master key (Km) that it has, extracts the work key (Kw), and stores it.

The control unit 1306 sends the EMM to the IC card 1311 at the timing shown in FIG. The control unit 1306 temporarily stores the received EMM until the appropriate timing to send the EMM to the IC card 1311. The IC card 1311 that has received the EMM from the control unit 1306 decrypts the encrypted EMM using the master key (Km) that it has, extracts the work key (Kw), and stores it.

Further, the control unit 1306 refers to the PAT of the broadcast wave of the program selected by the second tuner unit, receives the PMT of service_id_2 to be selected, and recognizes the ECM PID included in the received PMT. Receive ECM. Upon receiving the ECM, the control unit 1306 issues an ECM reception command to the IC card 1311.

If the IC card 1311 that has received the ECM reception command has already received the contracted EMM and extracted the work key (Kw), it sets the scramble key (Ks) in the descrambler 1302 as a normal response.

Since the program A is reserved for recording, a partial TS including video ES, audio ES, subtitle ES, etc. to be recorded/recorded is reconfigured by the control unit, encrypted by the encryption key unique to the receiver, and HDD etc. It is accumulated in the recording/recording unit 1312 of

In the case of the reserved program B, as in the case of the program A, the third tuner 1301-3 operates in place of the second tuner 1301-2 in the case of the program A, and stores in the recording/recording unit 1312.

When the reserved program A or program B is to be reproduced, the recorded program list is displayed on the user interface (not shown) shown on the screen, and after the program to be reproduced is selected, the control unit 1306 records it. -Read out from the recording unit 1312, descramble with a key unique to the receiver, obtain a compressed video/audio signal, and then decode the compressed signal with the video/audio decoding unit 1304, and monitor or speaker (not shown) Output to.

When the receiver has a plurality of tuner units, the tuner unit may include not only a tuner unit corresponding to 2K broadcasting but also a tuner unit corresponding to 4K8K broadcasting, that is, a tuner unit corresponding to advanced broadband satellite broadcasting.

FIG. 15 is a basic configuration diagram of the advanced BS digital broadcasting and advanced broadband CS digital (hereinafter 4K8K) broadcasting receiver shown in FIG. 5-1 of the fifth edition of Non-Patent Document 5.

The receiver 1500 includes a tuner section 1501, a descrambler 1502, an MMT demultiplexing section 1503, a video/audio decoding section 1504, a display section 1505, a control section 1506, and a key input section 1507. The MMT demultiplexing unit 1503 analyzes the transmitted descrambled broadcast signal, sequentially extracts the transmission control signal, and transmits the transmission control signal to the control unit 1506. The control unit 1506 can control the tuner unit 1501, the descrambler 1502, and the display unit 1505 based on the transmission control signal sent from the MMT demultiplexing unit 1503. The control unit 1506 can also receive a signal of an operation input from the remote controller 1510 via the key input unit 1507. The CAS module 1511 is a CAS module capable of performing ECM and EMM processing based on a command given from the control unit 1506 and extracting a work key (Kw) and a scramble key (Ks). The communication module 1515 is a module for communicating with a communication network. The example of FIG. 15 is a case where there is one CAS module 1511.

FIG. 16 is a basic configuration diagram of a receiver 1600 when descrambling a broadcast wave in the case of having three tuner units in addition to the basic configuration of FIG.

The difference between FIG. 16 and FIG. 15 is that there are three tuner units (first tuner unit 1601-1, second tuner unit 1601-2, third tuner unit 1601-3) and 3 A distributor 1613 is added to correspond to one tuner unit, and a recording/recording unit 1612 such as an HDD is added. Other than that, 1602 to 1611 are the same as 1502 to 1511 in FIG.

The first tuner unit 1601-1, the second tuner unit 1601-2, and the third tuner unit 1601-3 are compatible tuner units for 4K8K broadcasting. The receiver 1600 has a specification capable of viewing or recording/recording arbitrary three channels.

It is assumed that one CAS module used here has the response performance of ECM and EMM capable of processing three tuners.

According to Non-Patent Document 5, the update cycle of the scramble key (Ks) on the transmission side is 8000 ms, and it takes 7600 ms until the scramble key (Ks) included in the ECM after the ECM update is used to start scrambling the broadcast signal. Is.

It is assumed that the IC card (CAS module) 1611 has a response performance of, for example, ECM response performance of 600 ms and an EMM response performance of 650 ms.

It is assumed that the receiver 1600 transmits one EMM per business entity to the CAS module 1611 after receiving the EMM during the grace period in which the EMM processing is required.

FIG. 17 is an implementation example of conditional access of the receiver having the basic configuration shown in FIG.

1701 is a temporal transition of the received program. The received program 1701 is scrambled with Ks0 from time T11, Ks1 from time T11 to T12, Ks2 from time T12 to T13, and Ks3 from time T13 to T14. It indicates that 1702 is a temporal transition of the received ECM.

In the example of FIG. 17, from the time of ECM update timing T21 including Ks2 to T12 when the scramble key of the broadcast content is switched to Ks2, during 7600 ms, the first tuner unit 1601-1 which is the three tuners of FIG. 16, Each ECM selected by the second tuner unit 1601-2 and the third tuner unit 1601-3 and the EMM of at least one channel can be processed.

As shown in FIG. 17, the EMM received by the first tuner section 1601-1 is processed between times T21 and T12, and the EMM received by the second tuner section 1601-2 is processed between times T22 and T13. The EMM received by the third tuner section 1601-3 may be processed between times T23 and T14. That is, in this example, the total of the ECM and EMM processing times of the CAS module 1611 is (ECM response processing time=600 ms)×(3 tuners)+(EMM response processing time=650 ms)=2450 ms≦7600 ms. It can be processed for three tuners.

In the receiver shown in FIG. 16, as a use case, a case where two different programs are recorded while watching a certain broadcast (so-called W endorsement) will be described.

When a specific channel (service_id) is selected by the user's operation of the remote controller 1610, the control unit 1606 acquires the TLV_stream_id of the service_id from the previously received and stored TLV-NIT, acquires the carrier frequency thereof, and acquires the carrier frequency. The 1-tuner unit 1601-1 is controlled to perform a tuning process. The control unit 1606 also performs the following processing.

The control unit 1606 acquires the IP data flow information from the AMT that is received and stored in advance for the broadcast signal converted into the TLV stream by the first tuner unit 1601-1 and sets it in the MMT demultiplexing unit 1603. PLT (Package List) in PA message
Table), and MPT (MMT Package) of the specified service_id
An IP data flow for transmitting a Table) and a packet ID are acquired and set in the MMT demultiplexing unit 1603. The MMT packet of the packet ID is received, the PA message is acquired, and the MPT in the PA message is acquired.

Further, the control unit 1606 recognizes the PID of the EMM from the CAT (MH) arranged in the IP data flow selected by the first tuner unit 1601-1 and receives the EMM. When the control unit 1606 extracts the EMM addressed to itself based on the information of the CAS module 1611, the control unit 1606 transmits the EMM to the CAS module 1611.

The control unit 1606 sends the EMM to the CAS module 1611 at the timing shown in FIG. The control unit 1606 temporarily stores the received EMM until the appropriate timing to send the EMM to the CAS module 1611. Upon receiving the EMM from the control unit 1606, the CAS module 1611 decrypts the encrypted EMM using the internal master key (Km), extracts the work key (Kw), and stores it.

Further, by using a program guide (not shown) in advance by a user operation, two channels different from the channel selected by the first tuner unit 1601-1 and being output to the monitor are scheduled to be broadcast in the same time zone. Schedule recording of programs C and D.

When making a recording reservation, the control unit 1606 stores at least service_id of the program to be reserved, the program start time (including date and time), the end time or the broadcast duration from the program start in a memory area (not shown) for schedule management of the recorded program. To store. The control unit 1606 performs schedule management such that the program C is selected by the second tuner unit 1601-2 and the program D is selected by the third tuner unit 1601-3 for recording reservations for two different channels. The procedure for acquiring the EMM for the programs selected by the second tuner unit 1601-2 and the third tuner unit 1601-3 is the same as that of the first tuner unit 1601-1.

The control unit 1606 analyzes the MPT access control descriptor included in the broadcast wave selected by the first tuner unit 1601-1 to obtain the packet ID of the message storing the ECM and receives the ECM. Upon receiving the ECM, the control unit 1606 issues an ECM reception command to the CAS module 1611.

The CAS module 1611 that has received the ECM reception command decrypts the ECM encrypted using the extracted work key (Kw) and extracts the scramble key (Ks).

When the CAS module 1611 normally extracts the scramble key (Ks), it sends the scramble key (Ks) to the control unit 1606 as a normal response to the ECM received command.

Upon receiving the scramble key (Ks), the control unit 1606 transmits the received scramble key (Ks) to the descrambler 1602. The descrambler 1602 internally sets the received scramble key (Ks). The descrambler 1602 descrambles the broadcast signal sent from the tuner section 1601-1 using the set scramble key (Ks) at the necessary timing as shown in FIG.

The descrambled asset is separated into video/audio assets by the MMT demultiplexing unit 1603, a compressed signal is decoded by the video/audio decoder 1604, and output to a monitor or a speaker (not shown).

The reserved recording is performed by the user for a desired program using an electronic program guide (EPG, not shown) or the like. The control unit 1606 selects the second tuner unit 1601-2 at a time slightly before the start time of the program C scheduled to be broadcast in the same time zone reserved in advance in the program guide according to the setting contents of the recording reservation. To obtain a TLV stream. After the same processing as the first tuner 1601-1, the assets descrambled by the descrambler 1602 are separated by the MMT demultiplexing unit 1603 from the assets such as video, audio, and subtitles, and the encryption key unique to the receiver is used. The data is encrypted and stored in the recording/recording unit 1612 such as an HDD.

In the case of the reserved program D, similarly to the reserved program C, the third tuner unit 1601-3 performs channel selection processing and then stores it in the recording/recording unit 1612.

When the reserved program C or the program D is to be reproduced, the recorded program list is displayed on the user interface (not shown) shown on the screen, and after selecting the program to be reproduced, the control unit After reading from the recording unit, descrambling with the above-mentioned receiver-specific key to obtain the compressed audio/video asset, the audio/video decoding unit 1604 decodes the compressed signal, and a monitor or speaker (not shown) Output to.

When the receiver has a plurality of tuner units, the tuner unit may include a tuner unit compatible with 2K broadcasting and a tuner unit compatible with 4K8K broadcasting.

The receiver configuration of FIG. 18 is a 2K broadcasting operation regulation. Non-patent document 4 FIG. 13 in which the number of tuners is increased based on the basic configuration of the receiver described in Vol. Based on the basic configuration of the receiver described in the fifth volume of Document 5, the configuration has the configuration of FIG. 16 in which the number of installed tuners is increased. Two tuner units for 4K8K reception and two tuner units for 2K reception are provided. It is a basic configuration example of a receiver having three receivers.

The CAS module 1811 shown in FIG. 18 includes a CAS module for 4K8K broadcasting conforming to the fifth volume of the non-patent document 5 and the fifth volume of the non-patent document 5 as described in Appendix 7 of the non-patent document 5. This is a CAS module that integrates the functions of a compliant 2K broadcasting IC card. An example in which two 4K8K broadcast tuners and three 2K broadcast tuners are simultaneously processed by using one integrated CAS module will be described.

The first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 have an IF reception band from the IF frequency of BS right-hand circularly polarized wave to the left-handed polarized wave of 110CS and have a modulation method of 16APSK. Is a corresponding tuner/demodulator.

The third tuner section (2K) 1801-3, the fourth tuner section (2K) 1801-4, and the fifth tuner section (2K) 1801-5 are tuners for receiving terrestrial digital, BS digital, and broadband CS digital broadcasting of 2K broadcasting. It is a demodulation unit. The first descrambler 1802-1 is compatible with the 4K8K scramble system AES system, and the second descrambler 1802-2 is compatible with the 2K broadcast scramble system MULTI2 system.

The MMT demultiplexing unit 1803-1 is compatible with the MMT/TLV system multiplexing system operated in 4K8K broadcasting, and the TS decoding unit 1803-2 is compatible with the MPEG-TS system multiplexing system. The video/audio decoding unit 1804-1 is used for H.264/AVC which is used in 4K8K broadcasting for video coding. H.264|HEVC and audio coding are compatible with MPEG-4 AAC, MPEG-4 ALS and the like. The video/audio decoding unit 1804-2 is compatible with the MPEG-2 system that is used in 2K broadcasting for video encoding and the MPEG-2 AAC system for audio encoding.

The 2K broadcasting channel selection, video/audio display, and recording/recording are the same as those in the embodiment shown in FIG. 13. The 4K8K broadcasting channel selection, video/audio display, and recording/recording are the same as those in the embodiment shown in FIG.

Since the receiver 1800 complies with Non-Patent Document 3, Non-Patent Document 4, and Non-Patent Document 5, the grace period until the command is issued to the CAS module 1811 after receiving the EMM addressed to itself is 30 seconds or less. To do.

In addition, if there is a new regulation on the transmitting side that "the frequency of transmitting one EMM with one card ID set by one business entity within one 30-second period within the EMM processing grace period," or newly received As a regulation of the machine side, "at least one EMM must be processed for the CAS module within 30 seconds after receiving the EMM addressed to the CAS ID of its own receiver per business entity,
If the receiver receives more than the specified EMM, it may be ignored or discarded. It is assumed that the regulation "

Under this operation regulation, the response processing time of the ECM and EMM of the CAS module 1811 is, for example, 300 ms for the ECM response processing time for 2K broadcasting, 600 ms for the ECM response processing time for 4K8K broadcasting, and EMM for 2K broadcasting and 4K8K broadcasting. When the broadcast time is 650 ms, the verification of the number of tuners that can be mounted in one CAS module and the operation related to the CAS module will be described.

FIG. 19 is an implementation example of conditional access of the basic configuration shown in FIG.

1901 is a temporal transition of the received 4K8K program. The received program 1901 is from time T11-4, time T11-4 to T12-4, time T12-4 to T13-4, and time T13-4 to T14-4. It indicates that different scramble keys (Ks) are scrambled. Reference numeral 1902 represents a temporal transition of ECM and EMM reception for the 1901 program. 1903 is a temporal transition of the received 2K program. The received program 1903 is until time T11-2, between times T11-2 and T12-2, between times T12-2 and T13-2, and between times T13-2 and T14-2. It indicates that different scramble keys (Ks) are scrambled. Reference numeral 1904 denotes a temporal transition of reception of ECM and EMM for the program of 1903.

First, the conditions under which the third tuner 1801-3, the fourth tuner 1801-4, and the fifth tuner 1801-5 of 2K broadcasting can be processed by the CAS module 1811 will be verified.

As shown in FIG. 19, as described in Non-Patent Document 3 and Non-Patent Document 4, the update cycle of the scramble key (Ks) in 2K broadcasting is 2 seconds, and 1600 ms before and after the update of Ks. The transmission of the ECM including the Ks is started. The ECM update is also 2 seconds, which is the same as the Ks update cycle.

That is, ECM update is performed and broadcast signal Ks is updated. During 1600 ms, ECM processing for 3 tuners is performed, and in addition, channels selected by 3 tuners within 30 seconds are different from each other. In this case, at least one EMM transmitted by the third tuner unit (2K) 1801-3, the fourth tuner unit (2K) 1801-4, and the fifth tuner unit (2K) 1801-5 can be processed. is necessary.

Next, the two 4K8K broadcast tuners, that is, the conditions under which the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 can be processed by the CAS module 1811 are verified.

As shown in FIG. 19, as described in Non-Patent Document 5, the update of the scramble key (Ks) in 4K8K broadcasting is 8 seconds, and the transmission of the ECM including the updated Ks starts 7600 ms before the update of Ks. To be done. The ECM update cycle is also 8 seconds, which is the same as the Ks update cycle.

That is, the processing of the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 can be performed within 7600 ms until the ECM is updated and the Ks of the broadcast signal is updated. In the same way as in the case, if the channels selected by the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 are different, the first tuner unit (4K8K) ) 1801-1 and the second tuner section (4K8K) 1801-2 needs to be able to process at least one EMM transmitted on the channel selected, that is, two EMMs.

From the above, first, the Ks update cycle of 2K broadcast is shorter than the Ks update cycle of 4K8K, and in ECM and EMM, ECM requires immediate processing. Therefore, as a priority order, when performing ECM processing in 2K broadcasting, 3 tuners are performed within 1600 ms after each ECM update, then ECM processing in 4K8K broadcasting is performed, and then 2K broadcasting or 4K8K broadcasting is performed. It is appropriate to prioritize the process of processing the EMM in. It is verified whether or not the processing using one CAS module 1811 is possible with the above processing priorities.

As the most severe case, five tuner units (first tuner unit (4K8K) 1801-1, second tuner unit (4K8K) 1801-2, third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801 -4, the case where the update timing of each scramble key (Ks) in the program received by the tuner unit (2K) 1801-5) is the same will be described as an example.

First, the ECMs of the third tuner unit (2K) 1801-3, the fourth tuner unit (2K) 1801-4, and the tuner unit (2K) 1801-5, which are tuner units for 2K broadcasting, are processed from the ECM update timing T21. Start. Since the response processing time of the ECM for 2K broadcasting in the CAS module 1811 is set to 300 ms, the third tuner unit (2K) 1801-3, the fourth tuner unit (2K) 1801-4, and the tuner unit (2K) 1801-for 2K broadcasting are set. The response processing time of No. 5 is 900 ms.

Since the ECM response time of the 4K8K broadcast is 600 ms in this example, the 4K8K ECM can be processed in 1600-900=700 ms in the section until the time T12-2 of the update timing of the scramble key (Ks) of the 2K broadcast. In this section, the ECM processing of the first tuner section (4K8K) is performed.

The ECM response process of the first tuner unit 1801-1 is 300 ms×3+600 ms=1500 ms when there is no processing margin in the receiver, and from the end of this response process to the next ECM update timing time T22 of 2K broadcasting. Since it is only 500 ms, it is short to process ECM of 4K8K broadcast.

Similarly, three 2K broadcast tuners (third tuner section (2K) 1801-3, fourth tuner section (2K) 1801-4, tuner section (2K) 1801 are similarly provided at the ECM update timing time T22 of the 2K broadcast. After performing the ECM processing of -5), this time, the ECM processing of the 4K8K broadcasting tuner (the second tuner unit (4K8K) 1801-2) is performed.

Similarly, from the ECM update cycle T23 of the next 2K broadcast, three 2K broadcast tuners (third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, tuner unit (2K) 1801-5). ECM processing is performed. The ECM processing of the two 4K8K tuners (the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2) has already been completed, and by the Ks update timing T12-4 of the 4K8K broadcast. Since there is still room, three 2K broadcast tuners (third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, tuner unit (2K) 1801 from the 2K broadcast ECM update timing T13-2. After performing the ECM process of -5), the EMM process of the third tuner unit (2K) 1801-3 is performed.

Next, at the ECM update timing T24 of 2K broadcasting, three 2K broadcasting tuners (third tuner section (2K) 1801-3, fourth tuner section (2K) 1801-4, tuner section (2K) 1801-5) are selected. After the ECM processing, the EMM processing of the first tuner unit (4K8K) 1801-1 which is the 4K8K tuner is performed. At this point, the Ks of the 2K broadcast has been updated 4 times and 8 seconds have passed, and therefore the process proceeds to the Ks update timing T12-4 of 4K8K.

After the Ks update timing T12-4 of the 4K8K broadcast, the difference from the processing flowchart of the Ks update timing T11-4 of the 4K8K broadcast is that the fourth tuner unit (instead of the EMM process of the third tuner unit (2K) 1801-3 ( 2K) 1801-4 EMM processing is the point that the EMM processing of the second tuner section (4K8K) 1801-2 is performed instead of the EMM processing of the first tuner section (4K8K) 1801-1.

Next, after the Ks update timing T13-4 of 4K8K broadcasting, the fifth tuner unit (2K) 1801-5 is different from the timing T12-4 or later, instead of the EMM processing of the fourth tuner unit (2K) 1801-4. EMM treatment is performed. In this example, the number of mounted 4K8K tuners is two, and EMM processing is not necessary.

By controlling the order of the processes as described above, the first tuner unit (4K8K) is updated at the scramble key (Ks) update timings T11-4, T12-4, T13-4 of 4K8K broadcast in 8 seconds×3=24 seconds. EMMs of 1801-1, second tuner unit (4K8K) 1801-2, third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, fifth tuner unit (2K) 1801-5 At least one is processed at a time, and the third tuner unit (2K) 1801-3 and the fourth tuner unit (2K) 1801-4 are executed every 1600 ms from the 2K ECM update timing to the next Ks update timing. , The fifth tuner unit (2K) 1801-5 is subjected to ECM processing, and the first tuner unit (4K8K) and the second tuner unit (4K8K) and ECM processing of the tuner section (4K8K) was possible.

As described above, in the case where the 2K broadcasting CAS and the 4K8K broadcasting CAS are integrated CAS modules, even when the Ks updating cycle of the 2K broadcasting and the 4K8K broadcasting are different, in addition to the ECM updating cycle and the EMM processing grace period, By defining the minimum number of EMMs that need to be processed per business unit within the EMM processing grace period, it becomes possible to control the processing timing without omitting the processing of ECMs and EMMs.

Furthermore, it is assumed that the ECM update cycle is 2000 ms and the resend cycle is 100 ms, and in addition, there is a rule that “one EMM transmits one ID per business entity for 30 seconds”.

Under this operation regulation, as the performance of the CAS module (IC card), for example, the number of tuners that can be mounted when the response processing time of the ECM is 295 ms and the response processing time of the EMM is 400 ms is verified.

20 is an implementation example of conditional access of the same receiver as in FIG.

It is assumed that the EMM processing is started at time T21. In this case, the remaining time up to time T12 excluding the EMM processing time is 1600 ms-EMM processing time 400 ms=1200 ms, and since it is necessary to perform ECM processing at this time, up to 4 tuners can be installed. ..

EMM is supposed to be sent to only one entity for each business entity, that is, one tuner in 30 seconds. Therefore, the scramble key (Ks) is updated 15 times (30 seconds/2 seconds) in 30 seconds. It can be verified that it is possible to process the EMMs of the four entities within the grace period of 30 seconds with too much response time.

In the example of FIG. 20, if the receiver processing margin is not considered at all, up to 4 ECMs and 2 EMMs can be processed during the period T11 to T12 of 2000 ms in which the scramble key Ks is used. Up to 30 EMMs can be processed in 30 seconds.

However, under conditions different from the above operation, for example, in the conditions of the above example (example 2), it is possible to transmit 8 times for 30 seconds to one ID per one entity which is the transmission frequency of EMM If it is specified that there is a possibility (example 3), a maximum of 32 EMMs (8×4 tuners) will be sent in 30 seconds with 4 tuners. Can process 2 EMMs, and up to 30 EMMs can be processed within 30 seconds, but since up to 32 EMMs can be sent, 2 EMMs cannot be processed. ..

Therefore, even if ECM processing is possible, from the processing capacity of EMM, up to 3 tuners can be processed, that is, 24 EMM processing can be performed in 30 seconds.

In the actual design, it is designed in consideration of a margin such as a time for taking out the EMM or ECM in the receiver from the multiplexed broadcast wave.

The method of defining the frequency of the EMM is the number of times the tuner sends the EMM addressed to the ID of the CAS module (IC card) mounted on the receiver and then sends it to the CAS module (IC card) per grace period. However, the method of defining is not limited to this, and the frequency of sending EMMs per one business entity and one card ID may be quantitatively defined.

For example, the EMM transmission frequency may be one card ID per business entity per Ks update cycle. For example, the regulation method is such that the maximum number of EMMs transmitted from one business entity to one card ID per 2000 ms is two.

Further, as a regulation of the EMM transmission frequency, a regulation by a combination of a transmission frequency in the case where the transmission side sends the EMM in a burst and a grace period in which the reception side delays the processing to the CAS module after receiving the EMM, for example, one There is also a regulation method in which the maximum number of EMMs sent from the body to one CAS ID is 2 per 2 seconds and the maximum is 6 per 30 seconds.

The above has described the EMM for sending the contract information and the work key (Kw) to the CAS module (IC card). The EMM individual message used in the automatic display message is the purpose and the CAS module (IC card). ) May have different response performance.

Therefore, the frequency of the EMM and the EMM individual message may be defined by defining the EMM and the EMM individual message at the same frequency, or by defining the EMM and the EMM individual message at different frequencies. For example, the prescription method of "up to two EMM/EMM individual messages sent to the same receiver for 30 seconds per business entity" is a case where the same frequency is prescribed. The number of "maximum 2" is determined in consideration of the actual performance of the CAS module and is not limited to this value. In addition, an example in which the frequencies of the EMM and the EMM individual message are individually specified is shown.

“The maximum number of EMMs sent to the same receiver is 30 in 30 seconds per enterprise, and the maximum number of EMM individual messages sent to the same receiver is 3 in 30 seconds per enterprise.” or EMM And the EMM individual message can be changed depending on the width of the transmission time. "Maximum of two EMMs sent to the same receiver in 30 seconds per enterprise, and maximum of three EMM individual messages sent to the same receiver in 2 seconds per enterprise."
In this example, the EMM is defined for 30 seconds together with the update cycle of the transmission frequency scramble key (Ks) of the EMM individual message.

As described above, the frequency of the EMM and/or the EMM individual message is necessary for determining the number of tuners and considering the margin of processing of the control unit of the receiver in the receiver equipped with more than two tuners. Regarding the frequency, on the other hand, regarding the frequency, the method of applying for subscription of the broadcaster, for example, the method of accepting by phone as described above and sending immediately without disconnecting the phone, or not immediately sending on the phone or online. It is possible to specify according to the actual condition of the operation, such as when the EMM is sent out within a certain period of reception (for example, within 30 minutes).

The above is an example in which the transmission frequency of EMMs (including EMM individual messages) is specified in the operational rules. However, assuming that the EMM is missed by the receiver, the actual operation is also performed when the same EMM is retransmitted in a short time. Is assumed. Therefore, in the operation regulation, there is also a method in which after the EMM is received, the minimum number of EMMs to be received and processed within the grace period for the CAS module is defined. For example, "the number of receivers that have received an EMM/EMM individual message addressed to the same receiver should request the CAS module to perform processing is at least one in 30 seconds per business entity. EMMs that exceed the limit may be discarded.", etc., specify the minimum number that the receiver should process in the EMM processing grace period, and the EMM addressed to the receiver (CAS ID) received within the processing grace period is It is a method that can be discarded if it exceeds the regulation.

As described above, the receiver processes the CAS module (IC card) after receiving the EMM or EMM individual message addressed to itself (addressed to the card ID of the CAS module inserted in the receiver). It is easy to understand that the number of EMMs that need to be processed in the grace period before requesting is not limited to this, but it is not limited to this, It suffices that the transmission frequency of EMMs or EMM individual messages or the number of EMMs that the receiver needs to process is specified.

In addition, in view of the demand for receivers equipped with multi-channel tuners and the demand for receivers equipped with 2K, 4K, and 8K in accordance with the regulations that are already in operation, the past assumptions are made to enable strict receiver design. In order to define the transmission frequency of EMM or EMM individual message without contradiction, it is possible to go through the examination process opposite to the above.

For example, in the implementation example of the conditional access of the receiver illustrated in FIG. 20, when it is implicitly understood that four tuners can be installed, the receiver is addressed to itself (the CAS inserted in the receiver. After receiving the EMM (addressed to the card ID of the module), the CAS module (IC card) can process up to 24 EMMs during the grace period of 30 seconds, and from 24/4=6, By prescribing that "up to 6 EMMs can be sent per 30 seconds (EMM processing grace period) for one CAS ID per business entity", the tacit items before that are not overridden. Normalization is possible. Of course, the number of 6 or less may be any number as long as it is an integer of 6 or less.

The number 6 is a case where the performance of the CAS module is tentatively calculated, and it goes without saying that the result may change depending on the actual performance of the CAS module. As the transmission/reception system, the frequency of EMM transmission or the minimum number of EMMs to be processed within the EMM processing grace period is determined in consideration of the actual status of the CAS module performance, the ECM update period, and the EMM processing grace period.

The present embodiment is mainly defined in Non-Patent Document 5, which is wideband satellite broadcasting defined in Non-Patent Document 4, terrestrial digital television broadcasting defined in Non-Patent Document 3, advanced broadband satellite broadcasting, so-called 4K8K broadcasting. In addition to the ECM update cycle and retransmission cycle, the number of EMMs sent within a grace period after receiving an EMM addressed to a CAS ID installed in a receiver addressed to one CAS ID per entity, Alternatively, by defining the minimum number of EMMs to be processed within the processing grace period of EMMs, the same effect can be obtained. Also, it goes without saying that the package shape of the CAS module is not limited to the IC card and the IC chip shape does not change at all.

FIG. 21A shows the first tuner (4K8K) 1801-1, the second tuner (4K8K) 1801-2, the third tuner (2K) 1801-3, the fourth tuner (2K) 1801 in the receiver shown in FIG. -4, the example of the time chart which received ECM and EMM from the 5th tuner (2K) 1801-5 is shown. The receiver 1800 receives ECM and EMM, respectively, at the times indicated by arrows. After receiving the EMM2121 from the second tuner (4K8K) 1801-2, the first tuner (4K8K) 1801-1 to the ECM2110, the second tuner (4K8K) 1801-2 to the ECM2120, and the first tuner (4K8K) 1801-1. To EMM2111, third tuner (2K) 1801-3 to ECM2130, fourth tuner (2K) 1801-4 to ECM2140, third tuner (2K) 1801-3 to EMM2131, fifth tuner (2K) 1801. It shows that the ECM 2150 is sequentially received from -5. The horizontal axis is the time axis.

FIG. 21B shows a temporal transition in which the integrated CAS module of FIG. 18 performs the ECM/EMM processing on the ECM/EMM shown in FIG. 21A. The horizontal axis is the time axis.

The response processing time of the ECM and EMM of the integrated CAS module 1811 of FIG. 18 is, for example, 300 ms for the ECM response processing time for 2K broadcasting, 600 ms for the ECM response processing time for 4K8K broadcasting, and EMM for 2K broadcasting and 4K8K broadcasting. When both are 650 ms, the time transition of ECM and EMM processing is shown.

For example, 2160 represents the time the CAS module is processing the EMM 2121. Reference numeral 2161 represents a time during which the CAS module is processing the ECM 2110. 2162 represents the time during which the CAS module is processing the ECM 2120. 2163 represents the time when the CAS module is processing the EMM2111. Further, FIG. 2102-1 shows that the CAS module processes the EMM 2121, the ECM 2110, the ECM 2120, and the EMM 2111 in this order.

2102-1, 2102-2, and 2102-3, when the control unit 1806 receives the EMM 2121, confirms that there is no other high priority buffer, and the control unit 1806 sends the integrated CAS module 1811. It is the figure which considered the process of the CAS module at the time of receiving in order of 2110, 2120, 2111, 2130, 2140, 2131, and 2150 immediately after starting a process. Further, since the processing of the integrated CAS module 1881 cannot be performed in parallel, other processing cannot be performed during the processing time of 2160 which is the processing of 2121, for example. In this consideration, in order to make consideration under the worst condition, in 2102-1, 2102-2, and 2102-3, 2160 which is 2121 is first performed.

2102-1 represents the processing sequence when the receiver processes the ECM and EMM for the timing reception. In this example, the ECM 2130, which originally has to finish the processing, within 1600 ms which is the time from the reception timing of the ECM to the timing of receiving the broadcast signal descrambled using the scramble key (Ks) included in the ECM. , ECM2140, ECM2150 has not been completed.

Therefore, regarding the "4.1(8) EMM reception command and EMM individual message reception command" described in Non-Patent Document 4, the IC is received from the receiver within 30 seconds after receiving the EMM and EMM individual message addressed to the own card. Issue the command to be issued to the card. (Related description is in A-10 of this volume.)"
2102-2 is an example in which the ECM processing is prioritized and the EMM processing and the EMM individual message processing are delayed in accordance with the above. As in this example, by raising the priority of the ECM processing, the 2K ECM processing is completed within 2000 ms, which is the update cycle of the 2K ECM. However, the total processing time from EMM2121 to ECM2150 is the processing time of EMM2121 (650 ms) + the processing time of ECM2110 (600 ms) +
Processing time of ECM2120 (600 ms) + processing time of ECM2130 (300 ms) + processing time of ECM2140 (300 ms) + processing time of ECM2150 (300 ms) = 2750 ms, which is the last of the 2K ECMs in order. Received by the ECM 2150 is not completed within 2000 ms.

Therefore, in order to create a shared receiver described in TR-B39, Vol. 5, Appendix 7, “Shared receiver for current broadcasting and advanced BS digital broadcasting”, further improvement of the processing order of ECM and EMM is necessary. Becomes

FIG. 2102-3 is the order of processing when the ECM processing for 2K broadcasting is given the highest priority.

By prioritizing the processing of the 2K broadcast ECM, the processing time of the 2K broadcast ECM is as follows. EMM2121 (650 ms) + ECM2130 (300 ms) + ECM2140 (300 ms) + ECM2150 (300 ms) = 1550 ms, which is the last of the 2K ECMs, and the processing of the ECM2150 received by the receiver is completed within 2000 ms. ing.

22 is a flowchart in which the receiver requests the ECM and EMM processes from the CAS module in order to give the highest priority to the 2K broadcast ECM process described in FIG.

First, a buffer for performing ECM and EMM processing will be described. When the control unit 1806 illustrated in FIG. 18 receives the ECM or EMM from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-2, the control unit 1806 requests the CAS module 1811 to process the ECM and EMM. Is started (S2200).

The control unit 1806 temporarily controls the ECM and EMM sent from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-2 to control the order of ECM and EMM processing requests to the CAS module 1811. It manages the ECM reception buffer and the EMM reception buffer to be saved. Each buffer is prepared by the number of tuners, the ECM receiving buffer has a one-stage buffer, and the EMM receiving buffer has a plurality of stages of buffers.

The ECM reception buffer is a buffer for temporarily storing the ECM included in 2K broadcast, 4K broadcast and 8K broadcast. In order to distinguish between 2K and 4K8K, the buffer prepared for the 2K tuner distinguishes between the 2K ECM receive buffer and the 4K8K tuner prepared buffer for the 4K8K ECM buffer. The EMM reception buffer is a buffer for temporarily storing the EMM included in 2K broadcast, 4K broadcast and 8K broadcast. The data in each buffer is erased when a response to the processing request from the control unit 1806 to the CAS module 1811 is returned.

A flowchart for giving the highest priority to the 2K broadcast ECM processing described in FIG. 22 will be described. The control unit 1806 confirms the inside of the first 2K broadcast ECM reception buffer (S2201).

As a result of confirmation, if the CAS card module 1811 has data waiting for request transmission in the 2K broadcast ECM reception buffer (Yes in S2202), the control unit 1806 issues a processing request command to the CAS module 1811, Wait for a response (S2208).

As a result of the confirmation, if the CAS card module 1811 does not have data waiting for request transmission in the 2K broadcast ECM receive buffer (No in S2202), the control unit 1806 next checks the 4K8K broadcast ECM receive buffer. (S2203).

As a result of the confirmation, if the CAS card module 1811 has data waiting for request transmission in the 4K8K broadcast ECM reception buffer (Yes in S2204), the control unit 1806 issues a processing request command to the CAS module and sends a response to the command. Waiting (S2208).

As a result of confirmation, when there is no data waiting for request transmission in the CAS card module 1811 in the 4K8K broadcast ECM reception buffer (No in S2204), the control unit 1806 next confirms in the EMM reception buffer (S2205). ..

As a result of the confirmation, if the EMM reception buffer has data waiting to be transmitted to the CAS card module 1811 (Yes in S2206), the control unit 1806 issues a command for a processing request to the CAS module and waits for a response thereof ( S2208). The control unit 1806 extracts the data having the earliest reception time in the EMM buffer and issues a processing request command to the CAS module 1811.

As a result of the confirmation, when there is no data waiting for request transmission in the CAS card module 1811 in the EMM reception buffer (No in S2206), the control unit 1806 ends the processing request transmission processing (S2207).

Upon receiving the response from the CAS module 1811 in S2208, the control unit 1806 returns to the processing of S2201 again and confirms whether there is data waiting for a processing request in the 2K broadcast ECM receive buffer, the 4K8K broadcast ECM receive buffer, or the EMM buffer. continue.

Note that FIG. 22 shows the processing priority only for the processing of ECM/EMM of the present invention. Other commands between the control unit 1805 and the CAS module 1811 are omitted.

Next, "At least one EMM must be processed for the CAS module within 30 seconds after receiving the EMM with a card ID set for itself per business entity. If received, it may be ignored or may be discarded."

In Non-Patent Document 4, regarding the EMM processing grace period of the receiver, the EMM reception command, the EMM individual message reception command, the IC from the receiver within 30 seconds after receiving the EMM and the EMM individual message addressed to the own card. Issuing commands for cards. (There is a related description in A-10 of this volume).

In Non-Patent Document 5, similarly, regarding the EMM processing grace period of the receiver:-Reception of EMM reception command and EMM individual message reception command within 30 seconds after receiving EMM and EMM individual message addressed to own card Issue a command from the machine to the CAS module. (There is a related description in Appendix 4.)

According to the present embodiment, for example, “the number of EMM/EMM individual messages addressed to the same receiver to be processed by the CAS module is at least one in 30 seconds per business entity. It exceeds 30 seconds in 30 seconds. The EMM may be discarded."

The EMM reception buffer and the processing flow chart thereof when this rule is added will be described.

In order to realize the processing of discarding EMM that exceeds 30 seconds, the control unit 1806 shown in FIG. 18 needs to know the reception time when the EMM is received. For this reason, the control unit 1806 needs to have a storage area for storing the time when the EMM is received, in the EMM reception buffer included therein.

FIG. 23 is an example of the EMM reception buffer having a storage area for storing the time when the EMM is received. (A) is an example of a reception buffer that does not have a storage area for storing the received time. (B) is an example of a reception buffer having a storage area 3201 for storing the received time.

24, "The number of EMM/EMM individual messages addressed to the same receiver to be processed by the CAS module is at least one in 30 seconds per business entity. EMMs exceeding this are discarded in 30 seconds." It is a processing flowchart of a receiver when a rule is added.

An example will be described with reference to FIG. Upon receiving the EMM from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-1, the control unit 1806 starts the process request transmission process to request the CAS module 1811 to process the EMM (S2400).

The control unit 1806 has an EMM buffer for temporarily storing the EMM sent from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-1 in order to control the order of EMM processing requests in the CAS module 1811. to manage.

The control unit 1806 checks the inside of the EMM reception buffer (S2401).

As a result of the confirmation, if the EMM reception buffer has data waiting for request transmission in the CAS card module 1811 (Yes in S2402), the control unit 1806 confirms the elapsed time from the reception time of the data (S2404).

As a result of the confirmation, when the elapsed time is over 30 seconds (Yes in S2404), the data of the corresponding EMM is cleared (S2405). After clearing the data (S2405), the control unit 1806 returns to S2401 again to continue the processing.

As a result of confirmation, when the elapsed time has not passed 30 seconds (No in S2404), the control unit 1806 issues a processing request command to the CAS module and waits for a response (S2406). Upon receiving the response from the CAS module 1811, the control unit 1806 ends the process in order to confirm the priority with the ECM.

As a result of checking the inside of the EMM receiving buffer (S2401), if the CAS card module 1811 does not have data waiting for request transmission in the EMM receiving buffer (No in S2402), the control unit 1806 ends the processing (S2403). ).

Since the EMM process is not immediate, the control unit 1806 may control the start of the process in FIG. 24 by polling or the like.

Further, in the present embodiment, when the EMM reception buffer shown in FIG. 23 is provided and the EMM processing request is controlled by the processing flow chart shown in FIG. 24, for example, management is performed for each business entity, and the EMM buffer waiting for processing is stored. It is also conceivable to determine the reception time and discard the EMM received later if the EMM received within 30 seconds already exists in the EMM buffer.

FIG. 25 shows the process flow chart shown in FIG. 24, “When the reception time of the buffer of the EMM which is managed by each business entity and is waiting for processing is judged, and the EMM received within 30 seconds already exists in the EMM buffer. 9 is a processing flowchart of EMM reception by the receiver when a rule of “discarding EMM received later” is added.

Similarly, description will be made with reference to FIG. 18 as an example. Upon receiving the EMM from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-1, the control unit 1806 starts the EMM receiving process for storing the received EMM in the EMM receiving buffer (S2500).

Here, it is assumed that the EMM receiving buffer has an area for storing only one EMM data for each business entity.

The control unit 1806 refers to the business entity of the received EMM data and confirms whether the data is stored in the storage area of the same business entity in the EMM buffer (S2501).

When the data of the same business entity is stored as a result of the confirmation (Yes in S2501), the control unit 1806 confirms whether 30 seconds have elapsed from the reception time of the stored data (S2502).

If the result of the confirmation is within 30 seconds (Yes in S2502), the control unit 1806 discards the received EMM data (2506) and ends the process (S2506).

If the result of the confirmation is not within 30 seconds (No in S2502), the buffer of the same enterprise is cleared (S2503), the received EMM is saved in the buffer (S2504), and the process is terminated (S2505).

As a result of the confirmation, when the data of the same business entity is not stored (No in S2501), the control unit 1806 saves the received EMM in the buffer (S2504) and ends the processing (S2505).

As described above, in order to examine how many tuners can be designed with one CAS module (IC card), the ECM update cycle, the ECM retransmission cycle, and the CAS module (IC card) installed In addition to the response performance of ECM, the frequency of transmission per ID of one EMM entity, or the minimum number of EMMs that should be processed within the processing grace period of EMM is specified on the transmission/reception system, so that ECM and required EMM It is possible to examine the number of mounted tuners that can be processed by exactly one CAS module, without omitting the above processing.

In TR-B39 Part 5 “4.9.3.1 EMM section and EMM individual message section transmission frequency”, “In order to reduce the processing load of the receiver, EMM/EMM individual messages addressed to the same receiver are not centrally sent. Therefore, the maximum number of EMMs or EMM individual messages sent to the same receiver is 8 per 8 seconds. It is prescribed. This rule does not mean that all 8K, 4K, and 2K tuners installed in the EMM destined for the CAS module ID of the receiver are simultaneously transmitted within the EMM processing grace period (eg, 30 seconds). , EMM received 8 times in 8 seconds other than ECM processing may be possible within the EMM processing grace period (eg, 30 seconds) after receiving EMM, but depending on the EMM transmission timing of the on-board tuner, 4K (or 8K) ) Even if the tuner can receive 8 EMMs in 8 seconds, there is a possibility that the processing cannot be completed in 30 seconds after reception. Originally, 8 EMMs should be sent every 30 seconds in order to perform EMM processing without being missed by the receiver, but if the broadcaster allows it, 8 EMMs received in 8 seconds are EMMs. Without discarding even after the processing grace period (30 seconds), at least one EMM processing is performed every 30 seconds, and eight cached EMMs are processed once during the EMM grace period (example 30 seconds), and at the latest Since the object of the present invention can be achieved even if the processing is allowed during the period x 8 (eg, 240 seconds), there is no problem in the object and effect of the present proposal to be defined as an exceptional case. It is important to determine the rules that can be used for transmission and reception, taking into account the performance of the CAS module so that the receiver can perform EMM processing without omission.

As described above, according to the present embodiment, at least the first control information (EMM) including the encrypted first key (Kw) and the second control information (ECM) including the encrypted second key (Ks). And a tuner section for receiving a service signal including scrambled content, a descrambler for receiving the scrambled content output from the tuner section, a control section for controlling at least the tuner section and the descrambler, and the control section. The first key (Kw) is controlled from the first control information (EMM) by using a unique third key (Km), and the first key (Kw) is acquired from the second control information (ECM). A CAS module that obtains the second key (Ks) to be given to the descrambler using one key (Kw),
The control unit is
It is set that the first control information (EMM) per business entity should process at least R (an integer of 1 or more) within the processing grace period to the CAS module after receiving the EMM defined by the regulation. Therefore, after detecting the first control information (EMM) of the one business unit and performing R number processing within the EMM processing grace period, the first control information (EMM) next to the one business entity is performed. ) Is detected, a receiving device is provided that suppresses command transmission to the card unit for at least the first control information (EMM) within the EMM processing grace period.

As can be understood from the above description, it goes without saying that the above-described embodiment has a function as a receiver and features as a transmitter and a transmission/reception system. Hereinafter, further main points in the above-described embodiment will be collectively described. (1) The maximum number of EMM/EMM individual messages sent to the same receiver is 30 (see *1) for each enterprise (see *2 below). (2) The maximum number of EMM/EMM individual messages sent to the same receiver is 30 (see *1 below) for each business entity, and M2 (see *3 below) for 2 (see *3 below) seconds. (See *2 and 4 below). (3) The maximum number of EMM/EMM individual messages sent to the same receiver is M2 (see below *2, 4) for 2 (see below *3) seconds per enterprise. (4) The maximum number of EMMs sent to the same receiver is 30 (see *1 below) per business entity (see *2 below), and 30 EMM individual messages per enterprise (see below *1). ) Maximum M3 (see below *2, 5) in seconds. (5) The maximum number of EMMs sent to the same receiver is 30 (see *1 below) per business unit (see *2 below), and 2 EMM individual messages per enterprise (see below *3). ) Maximum M3 (see *2 and 5 below). The maximum number of EMMs that can be sent to the same receiver is 2*2 (see *3 below) per enterprise, and the maximum number of EMM individual messages is 30*30 (see below *1) per enterprise. *See 2 and 5). *1... 30 seconds is a grace period until processing is performed on the CAS after receiving the EMM/EMM individual message defined by the current operation regulations, *2... TR-B14 and B15 have the same number, TR- Another value in B39, *3... 2 seconds is the ECM (Ks) update cycle in the operation regulations TR-B14 and TR-B15 in the current broadcast (2K), in advanced BS/CS (4K8K) TR-B39 8 seconds, *4... M2 is the case where the value of M is 3 or more, and when the provision for sending in burst within one Ks update cycle is required, *5... EMM and EMM The response time performance of CAS for individual messages is actually different. Although there are few EMM individual message operations, in the case of a proposed rule that takes into account the operator's request to change the frequency with EMM.

Furthermore, various effects can be obtained as described below by the configuration of the receiver described above. That is, (B1)
At least a first control information (EMM) including an encrypted first key (Kw), a second control information (ECM) including an encrypted second key (Ks), and a service signal including scrambled content are received. Tuner section, a descrambler for receiving the scrambled content output from the tuner section, a control section for controlling at least the tuner section and the descrambler, and the first control information (EMM) controlled by the control section. ), the first key (Kw) is obtained using a unique third key (Km), and the obtained first key (Kw) is obtained from the second control information (ECM). A CAS module for obtaining the second key (Ks) to be given to the descrambler,
The control unit is
It is set that the first control information (EMM) per business entity should process at least R (an integer of 1 or more) within the processing grace period to the CAS module after receiving the EMM defined by the regulation. Therefore, after detecting the first control information (EMM) of the one business entity, after performing R pieces of processing within the grace period of the EMM processing, the next first control information of the one business entity. A receiving device that suppresses command transmission to the card unit for at least the first control information (EMM) within the grace period when (EMM) is detected.

According to the above configuration (B1), even if there is exactly one CAS module, the receiver (which can enable the viewing of the contracted program without losing the processing of the ECM and EMM necessary for descrambling) can be performed. Or a transmitter or transceiver). (B2)
In the receiver, the control unit controls the first control information (EMM) depending on whether the tuner unit receives terrestrial digital television broadcasting or BS digital broadcasting/broadband CS digital broadcasting. ) Is sent, or the number of processing obligations of the first control information (EMM) is the same, to determine the frequency or the number. The first control information (EMM) is processed by using the above information in common.

According to the above configuration (B2), there is an advantage in that the number of EMM frequencies (processing obligation) of TR-B14 and TR-B15 is the same. In other words, TR-B14 and TR-B15 are standard specifications of 2K TV for 3 wave shared device of terrestrial digital/BS/110CS, and regardless of broadcasting media (terrestrial digital, BS, 110CS) When the EMM processing frequency regulation is the same, the mounting conditions do not become complicated in the CAS processing. Under the same conditions, when verification is easy at the receiver development stage and the number of transmissions is specified, TR-B14 and B15 are the same B-CAS system, and the EMM transmission equipment can be shared. (B3)
The control unit, when the tuner unit is receiving terrestrial digital television broadcasting and when receiving advanced broadband satellite digital broadcasting,
It is assumed that the frequency of sending the first control information (EMM) is different within the grace period (for example, 30 seconds), or that the number of processing obligations of the first control information (EMM) is different. As a premise, the first control information (EMM) is processed by changing the information for determining the frequency or the number.

According to the configuration of (B3) above, the TR-B14 is terrestrial digital, and pay broadcasting is possible according to the operation regulations, but since it is practically only free broadcasting and the possibility of operating the EMM is extremely low, EMM different from TR-B39 which requires pay broadcasting is more likely to be able to process more ECM, and by setting the frequency of TR-B14 low, the number of terrestrial digital tuners installed Is likely to increase. (B4)
The control unit determines whether the tuner unit receives BS digital broadcasting/broadband CS digital broadcasting or advanced broadband satellite digital broadcasting.
It is assumed that the frequency of sending the first control information (EMM) is different within the grace period (for example, 30 seconds), or that the number of processing obligations of the first control information (EMM) is different. As a premise, the first control information (EMM) is processed with different information for determining the frequency or the number.

According to the above configuration (B4), even if the command response performance of the EMM and ECM in the TR-B39 compliant CAS module is different from the command response performance of the TR-B14, 15 pure IC card, it is TR-B39 compliant. Other EMM frequencies can be set according to the performance of the CAS module of TR. Since TRMM-B39 can acquire EMM via the communication path, different frequency settings can be set for TR-B14 and TR-B15 that can only perform EMM transmission of broadcast waves only. Is possible (reduces the number of TR-B39), TR-B39 is targeted for late digital broadcasting as compared to 2K broadcasting such as TR-B14 and TR-B15, so new 4K8K pay subscribers In order to improve the service, the number of EMMs sent for a certain period of time can be increased so that even if the receiver misses EMMs, EMMs can be received as soon as possible to shorten the time from application for subscription to unlocking (EMM reception). It is possible. Further, in the TR-B39, it is also possible to set the priority order by the EMM acquisition via the communication channel and the EMM acquisition by the broadcast wave. For example, in order to immediately unlock the pay viewing via the communication channel. Needless to say, raising the priority of processing the EMM via communication next to the ECM is also effective in terms of user convenience. (B5)
The control unit determines whether the tuner unit receives terrestrial digital television broadcasting, BS digital broadcasting/broadband CS digital broadcasting, or advanced broadband satellite digital broadcasting. , The first control information (EMM) being sent at the same frequency, or the first control information (EMM) having the same number of processing obligations, The first control information (EMM) is processed with the frequency or the information for determining the number being common.

According to the configuration of (B5), the processing at the receiver is simplified. The same EMM processing timing is possible regardless of the reception network (terrestrial digital, 2KBS, 2KCS, 4K8KBS, 4K110CS). (B6)
The control unit, when the tuner unit is receiving BS digital broadcasting/broadband CS digital broadcasting and in a first case receiving advanced broadband satellite digital broadcasting,
Assuming that the frequency of sending the first control information (EMM) is the same, or that the number of processing obligations of the first control information (EMM) is the same, the frequency Alternatively, the first control information (EMM) is processed by sharing the information for determining the number,
In the second case where the tuner section is receiving a terrestrial digital television broadcast, the first control information (the information for determining the frequency or the number is different from that in the first case). EMM).

According to the configuration of (B6) above, the TR-B14 is different in the frequency of EMM transmission,
B15 and B39 have the same frequency. The TR-B15 and TR-B39 including the pay system and the terrestrial digital broadcasting (divided by the TR-B14) having substantially no pay broadcasting have advantages similar to the above (B3). Further, by setting the frequency of TR-B14 low, it is highly possible that the number of terrestrial digital tuners mounted can be increased. (B7)
The tuner unit receives the first control information (EMM) corresponding to the one business entity and an EMM individual message transmitted to each receiver and indicating a pointer of an automatic display message, and receives an EMM individual message,
The control unit processes the first control information (EMM) corresponding to the one business entity and the EMM individual message separately.

(B8) <Configuration of EMM and EMM Individual Message EMM Frequency (Processing Obligation) Separately>
The tuner unit receives the first control information (EMM) corresponding to the one business entity and an EMM individual message transmitted to each receiver and indicating a pointer of an automatic display message, and the control unit receives the one business entity. For determining the frequency of the first control information (EMM) and the frequency of the EMM individual message on the assumption that the frequencies of the first control information (EMM) and the EMM individual message corresponding to Different information is processed to process the first control information (EMM) and the EMM individual message.

According to the configurations of (B7) and (B8), the numbers of EMM frequencies (processing obligations) of EMMs and EMM individual messages are different. As a result, it is sufficiently assumed that the CAS module response performances of the EMM and the EMM individual message are different, a short response time and the size of the EMM individual message are predicted to be smaller than the EMM, and the response performance is expected to be short. Therefore, it is possible to specify the frequency higher than that of EMM. In addition, compared to EMM, EMM individual messages are individual parts (such as subscriber names) for each ID of EMM mails and automatic display messages, so it is possible that actual usage frequency is low, and the contract is being called. Since it is difficult to request the immediacy such as confirmation in the above, the frequency of EMM is decreased, that is, the number of EMMs is set in a span longer than the EMM processing grace period, or the number of EMMs is reduced even in the same processing grace period. It is expected to increase the time to turn to. (B9)
The frequency of the first control information (EMM) is set according to the processing delay period of the first control information (EMM).

According to the configuration of (B9) above, the EMM frequency is determined by the EMM processing grace period, and in this respect, the number of EMMs required for an arbitrary time within the grace period is processed. It can be said that it is a reasonable setting means. Even when considering the flow of the receiver, the degree of freedom increases if it is decided during this period. (B10)
The frequency of the first control information (EMM) is set based on the update cycle of the second key (Ks) of the first control information (EMM).

According to the configuration of (B10) above, the EMM frequency is determined by the Ks update cycle. The EMM processing grace period is currently 30 seconds, and the Ks update period is shorter. In considering the filtering performance of the EMM at the receiver, the definition of the number of EMMs destined for itself in a short time is meaningful in terms of how many EMMs may be addressed to itself. However, this is a case where the business operator issues a plurality of EMMs in a short time. Issuing multiple EMMs in a short time is effective when the receiver misses the acquisition of the EMM or when the user wants to acquire the EMM as soon as possible and wants to send the same EMM in a short time. However, if only the EMM transmission rate is set, the EMM cache area will increase infinitely if the processing grace period (30 seconds) remains set. Therefore, the number is used to estimate the EMM temporary cache area instead of the transmission rate. Is valid. (B11) <Determining EMM Frequency by Ks Update Cycle> The frequency of the first control information (EMM) is the processing grace period of the first control information (EMM) and the frequency of the first control information (EMM). It is set based on the update cycle of the second key (Ks),
According to the configuration of (B11), in the configuration of (B11), the EMM frequency is determined by the Ks update cycle. If you want one to be received in 30 seconds, but you want to receive it as soon as possible, for example, "The receiver needs at least one process per business entity in 30 seconds. If it is specified that the EMMs are sent at a rate of 2 in 2 seconds, but the EMM acquired in 30 seconds after receiving the EMM may be discarded or not received, 1 in the processing grace period of 30 seconds. Therefore, the remaining time can be used for EMM and ECM processing of other tuners, and more EMMs for a certain period of time can be sent to enable faster EMM reception, and viewers can confirm the contract in a shorter time. Also, the receiver side can estimate the amount of temporary EMM cache.

In addition to the above points, in the present embodiment, a broadcast signal transmission system described below. Is also included, that is, (C1)
On the receiving side,
At least a first control information (EMM) including an encrypted first key (Kw), a second control information (ECM) including an encrypted second key (Ks), and a service signal including scrambled content are received. Tuner section, a descrambler for receiving the scrambled content output from the tuner section, a control section for controlling at least the tuner section and the descrambler, and the first control information (EMM) controlled by the control section. ), the first key (Kw) is obtained using a unique third key (Km), and the obtained first key (Kw) is obtained from the second control information (ECM). Equipped with a CAS module (IC card) that acquires the second key (Ks) to be given to the descrambler, the transmission facility sends the frequency of the first control information (EMM) per business entity to the EMM. A broadcast signal transmission system in which it is set that the number is a minimum of R (an integer of 1 or more) within a processing grace period (30 seconds). (C2) In terrestrial digital television broadcasting and BS digital broadcasting/broadband CS digital broadcasting,
It is assumed that the transmission facilities send the first control information (EMM) at the same frequency, or that the number of processing obligations of the first control information (EMM) is the same.
The broadcast signal transmission system according to the above C1, wherein the reception side can process the first control information (EMM) by sharing information for determining the frequency or the number. (C3) The terrestrial digital television broadcast and the advanced wideband satellite digital broadcast have different transmission frequencies of the first control information (EMM) within the EMM processing grace period (30 seconds) between the transmission equipments, or , The number of processing obligations of the first control information (EMM) is different, and the first control information (EMM) can be processed with different information for determining the number of times or the number of times at the receiving side. The broadcast signal transmission system according to C1. (C4) In the terrestrial digital television broadcasting, the BS digital broadcasting/broadband CS digital broadcasting, and the advanced wideband satellite digital broadcasting, the respective transmission equipments have the first control information (EMM) within the EMM processing grace period (30 seconds). ) Is transmitted differently, or the number of processing obligations of the first control information (EMM) is different, and the reception side has different information for determining the frequency or the number. The broadcast signal transmission system according to (C1) above, which is capable of processing control information (EMM). (C5) In the BS digital broadcasting/broadband CS digital broadcasting and the advanced wideband satellite digital broadcasting, the transmission equipments have the same frequency of sending the first control information (EMM), or the first control The number of pieces of information (EMM) required to be processed is the same, and the reception side can process the first control information (EMM) by sharing the information for determining the frequency or the number. The broadcast signal transmission system according to C1). (C6) In the first case of BS digital broadcasting/broadband CS digital broadcasting and advanced wideband satellite digital broadcasting, each of the transmission equipment sets the same frequency at which the first control information (EMM) is sent. Alternatively, assuming that the number of processing obligations of the first control information (EMM) is the same, and the reception side shares the information of the determination of the frequency or the number, the first control information (EMM) is processed. In the second case of terrestrial digital television broadcasting on the receiving side, the information for determining the frequency or the number is different from the first case, and the first control information ( The broadcast signal transmission system according to (C1) above, which is capable of processing EMM). (C7) The transmission facility transmits the first control information (EMM) corresponding to the one business entity and an EMM individual message indicating a pointer of an automatic display message transmitted for each receiver, and the reception side, The broadcast signal transmission system according to (C1), wherein the first control information (EMM) corresponding to the one business entity and the EMM individual message are separately processed. (C8) The transmission facility transmits the first control information (EMM) corresponding to the one business entity and an EMM individual message indicating a pointer of an automatic display message transmitted for each receiver, and the reception side Assuming that the frequencies of the first control information (EMM) and the EMM individual message corresponding to one business entity are different from each other, the frequency of the first control information (EMM) and the frequency of the EMM individual message are The broadcast signal transmission system according to (C1), wherein the first control information (EMM) and the EMM individual message can be processed by differentiating information for determination. (C9) The broadcast signal according to any one of C1 to C8, wherein the frequency of the first control information (EMM) is set according to a processing delay period of the first control information (EMM). Transmission system. (C10) Any one of the above C1 to C8, wherein the frequency of the first control information (EMM) is set based on an update cycle of the second key (Ks) of the first control information (EMM). 1. The broadcast signal transmission system according to 1. (C11) The frequency of the first control information (EMM) depends on a processing grace period of the first control information (EMM) and an update cycle of the second key (Ks) of the first control information (EMM). The broadcast signal transmission system according to any one of C1 to C8, which is set based on the above.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the scope of equivalents thereof. Furthermore, in each of the constituent elements in the claims, the constituent elements are expressed in a divided manner, a plurality of them are expressed in combination, or a combination of these is also included in the scope of the present invention. Further, a plurality of embodiments may be combined, and an example configured by this combination is also included in the scope of the invention.

Further, in order to make the description clearer, the drawings may schematically show the width, thickness, shape, etc. of each part as compared with the actual mode, but this is merely an example, and It does not limit the interpretation. Further, in the present specification and the drawings, constituent elements that exhibit the same or similar functions as those described above with respect to the already-existing drawings are designated by the same reference numerals, and redundant detailed description may be appropriately omitted. .. In addition, the device of the present invention is applied even when the claims are expressed as control logic, when expressed as a program including instructions for executing a computer, and when expressed as a computer-readable recording medium in which the instructions are described. is there. Further, the names and terms used are not limited, and other expressions are included in the present invention as long as they have substantially the same content and meaning.

100... Broadcast station, 101... Broadcast station server, 102... First security function, 103... First basic function, 120... Service provider device, 140... Receiver , 141... Communication control unit, 142... Second basic function, 143... Second security function, 144... Application management function, 145... API, 146... Application, 160 ... Display device, 162... HDD, 201... Video encoder, 306... Video decoder, 309... Analysis unit, 330... Control unit, 327... Display control unit, 328... ..Display unit, 329... speaker, tuner unit... 501, first tuner unit... 801-1, 901-1, 1301-1, second tuner unit... 801-2, 901- 2, 1301-2, third tuner section... 1301-3, descrambler... 502, 802, 902, 1302, control section... 506, 806, 906, 1306, IC card... 511, 811, 13111, first IC card... 911-1, second IC card... 911-2, tuner/demodulator... 1501, first tuner (4K8K)... 1601-1, 1801-1 , Second tuner section (4K8K)...1601-2, 1801-2, third tuner section (4K8K)...1601-3, 1801-3, fourth tuner section (2K)...1801-4 , Fifth tuner unit (2K)...1801-5, descrambler...1502, 1602, first descrambler...1802-1, second descrambler...1802-2, control unit... 506, 806, 906, 1306, CAS module... 1511, 1611, 18111.

Claims (2)

The first tuner unit receives a first digital television broadcast including a first service signal transmitted by a first business entity, and includes an encrypted first a key (Kw) included in the first service signal. ) 1a control information (EMM) of the first business entity, 2a control information (ECM) of the first business entity including the encrypted second a key (Ks), and first scrambled content. Received,
The second tuner unit receives the second digital television broadcast including the second service signal transmitted by the second business entity, and includes the encrypted first b key (Kw) included in the second service signal. ) 1b control information (EMM) of the second entity, 2b control information (ECM) of the second entity including the encrypted second b key (Ks) and second scrambled content. Received,
A descrambler descrambles the first and second scrambled contents output from the first tuner unit and the second tuner unit,
Control unit, checks the predetermined second table of the second content of the first service signal first content predetermined first table, the second service signal that is output from the descrambler that,
The 1a control information (EMM), the 2a control information (ECM), the 1b control information based on the packet IDs included in the predetermined first table and the predetermined second table. (EMM), extracting the second b control information (ECM), respectively.
Controlling the first tuner section, the second tuner section, and the descrambler,
The CAS module is controlled by the control unit, acquires the 1a key (Kw) using the unique 3a key (Km) from the 1a control information (EMM) of the first business entity, and acquires the 1a key (Kw). Obtaining the second a key (Ks) to give to the descrambler from the second a control information (ECM) of the first entity using the first a key (Kw) that has been
The first b key (Kw) is acquired from the first b control information (EMM) of the second business entity using a unique third b key (Km), and the acquired first b key (Kw) is used. And obtaining the second b key (Ks) to give to the descrambler from the second b control information (ECM) of the second entity,
Equipped with
Storing the first a control information (EMM) of the first business entity in a first buffer and storing the second a control information (ECM) of the first business entity in a second buffer,
Further, the control unit receives the first-a control information (EMM) and then transmits a first-a command corresponding to the first-a control information (EMM) to the CAS module, and a first period. It is a second period different from the first period, and after receiving the 1b control information (EMM), performs the 1b command transmission corresponding to the 1b control information (EMM) to the CAS module. Setting the second period, and processing at least R (integer of 1 or more) pieces of the 1a control information (EMM) in the first period; and in the second period, 1b control information (EMM) is set to be processed at least R (integer of 1 or more),
Between the reception of the first a control information (EMM) and the transmission of the first a command corresponding to the first a control information (EMM) to the CAS module within the first period, Performing a 2a command transmission corresponding to the 2a control information (ECM) of the first business entity received by the first tuner unit to the CAS module,
Between the reception of the first b control information (EMM) and the transmission of the first b command corresponding to the first b control information (EMM) to the CAS module within the second period, Performing a second b command transmission corresponding to the second b control information (ECM) of the second business entity received by the second tuner unit to the CAS module,
After storing the 1a control information (EMM) of the first business entity received by the first tuner unit in the first buffer, the second buffer control information of the first business entity in the second buffer. If (ECM) is not stored, then perform the 1a command transmission of the 1st business entity to the CAS module;
After storing the 1a control information of the received first entity (EMM) by the first tuner section to the first buffer, the 2a control information of the first entity to the second buffer (ECM) is stored, the first business entity is transmitted before the first a command corresponding to the first a control information (EMM) of the first business entity is transmitted to the CAS module. The second method of transmitting the second command corresponding to the second control information (ECM) is transmitted to the CAS module. The receiving method according to claim 1, wherein each of the first period and the second period is 30 seconds.

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