JP7275214B2 - receiver - Google Patents

Description

The description of the embodiments relates to a receiving device for receiving broadcast signals, but also extends to devices for transmitting broadcast signals, devices for transmitting and receiving broadcast signals, and methods for implementing the same.

Currently, equipment that receives terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting has a function to record two different programs at the same time (double recording function), as well as a function to record all channels at the same time. Devices capable of simultaneously recording (recording) the programs that are played are commercialized.

On the other hand, these broadcasts are scrambled on most channels regardless of whether they are paid or free.
Access System) module (IC card) is essential.

The background to this scrambling will be explained. When BS digital broadcasting started on December 1, 2000, only pay broadcasting was scrambled, and Japan Broadcasting Corporation (NHK) and free commercial broadcasting were non-scrambled broadcasting.

The purpose of performing scrambling in pay broadcasting is to establish a pay broadcasting business. For this reason, at the time of shipment of receivers, broadcast programs are basically scrambled on all receivers so that they cannot be received. By giving the unlocking key, it is possible to watch the contracted program on the receiver. As a result, a pay broadcasting business has been established in which subscribers can view contracted programs by concluding a receiving contract in which payment is made.

A television broadcasting mechanism that allows subscribers to descramble contracted programs is called a conditional access system (CAS). The conditional access system is specified in standard STD-B25 of ARIB (Association of Radio Industries and Businesses) for domestic terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting. -B25 Described in Chapter 3 of Part 1.

Conditional access schemes use triple key schemes to allow only subscribers to descramble programs. 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 generate a work key (Kw) take 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). Using this scramble key (Ks), the scrambled content sent from the broadcasting station is descrambled.

In order to prevent unauthorized descrambling, the broadcasting station frequently changes and sends the scramble key (Ks) (the same key is used for about 1 second). Therefore, the broadcasting station sends an ECM having a scramble key (Ks) of the video to be descrambled by airwaves prior to the video to be descrambled.

On the other hand, with the start of BS digital broadcasting in December 2000, ARIB TR-B15 was defined as an operational regulation that defines actual operational parameters of this broadcasting. In this ARIB TR-B15 Part 1 BS Digital Broadcasting Operational Regulations, Part 5 BS Digital Broadcasting Conditional Access System (CAS) Receiver Specifications and Operational Regulations, the update cycle of the scramble key (Ks) was However, in consideration of the commercialized two-screen function (simultaneous viewing) and the so-called back recording function that records another channel (CH) while viewing, the standard STD-B25 stipulates that the update period is about 1 second. On the other hand, the background is defined so that at least two different channels can be simultaneously viewed or back-recorded if the update cycle is two seconds or more.

"Access Control Method Standard for Digital Broadcasting" ARIB STD-B25 Version 6.5 Revised March 17, 2015, Association of Radio Industries and Businesses "Access control method (2nd generation) and CAS program download method standards for digital broadcasting" ARIB STD-B61 Ver.1.2 Revised December 3, 2015, Association of Radio Industries and Businesses "Digital Terrestrial Television Broadcasting Operation Regulations Technical Data" ARIB TR-B14 Version 6.2 Revised on July 6, 2016, Association of Radio Industries and Businesses "BS/Broadband CS Digital Broadcasting Operation Regulations Technical Data" ARIB TR-B15 Version 7.1 Revised on July 6, 2016, Association of Radio Industries and Businesses "Advanced Broadband Digital Satellite Broadcasting Operational Regulations Technical Data" ARIB TR-B39 Version 1.0 Revised on July 6, 2016, Association of Radio Industries and Businesses

In order to descramble the contract broadcast program, a scramble key (Ks) is necessary as described above. to decrypt the ECM (update cycle: 2 seconds) containing the scramble key (Ks). It is necessary to decode EMMs containing (Kw) (e.g. sent once a day).

On the other hand, among current receivers, equipment capable of simultaneously recording (recording) a plurality of programs being broadcast at a certain time, such as an all-channel recording function, has been commercialized. That is, (1) an environment is provided in which a large number of tuners can be used simultaneously within the receiver. In this case, each scramble key (Ks1 to Ksn) for a large number of tuners is required within 1 or 2 seconds. Consider whether the receiver can extract the scramble key within a predetermined time. There is a need. (2) In addition, in the conditional access system, EMMs are transmitted to display/delete pay TV contract information and automatic display messages, and there are two main purposes of transmission. One is an EMM transmission for periodic renewal of the expiration date of a fee-based contract, and the other is a request for unlocking the lock or erasing an automatic display message immediately after applying for subscription when a new subscriber makes a subscription contract with a business operator. EMMs for erasure may be sent immediately to respond to the request. In this case, it is assumed that the receiver may miss the EMM acquisition, and the same EMM may be repeatedly sent in the broadcast signal within 1 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, the signal is received by the multiple tuners described in (1) within 1 or 2 seconds. It is necessary to ensure that the respective scrambling keys (Ks1-Ksn) are obtained at the receiver for each scrambled video signal.

Considerations for ensuring that this scrambling key is obtained at the receiver need to be considered in the current rules. If the receiver fails to acquire the scramble key, some subscribers will not be able to view the subscribed programs.

Therefore, the present embodiment provides a transmission/reception method that enables viewing of a contracted program without missing ECM and EMM processing required for descrambling, even if there is, for example, exactly one CAS module. for the purpose.

According to an embodiment,
Receiving a first digital television broadcast including a first service signal sent by a first digital terrestrial operator, and including an encrypted first key (Kw) included in the first service signal receiving first entity's 1a control information (EMM), said first entity's 2a control information (ECM) including an encrypted 2a key (Ks) and first scrambled content; 1 tuner;
Receiving a second digital television broadcast including a second service signal sent by a second digital terrestrial broadcaster, and including an encrypted key 1b (Kw) included in the second service signal receiving 1b control information (EMM) of said second entity, 2b control information (ECM) of said second entity including an encrypted 2b key (Ks) and second scrambled content; 2 tuners and
Receiving a third digital television broadcast including a third service signal sent by a third entity of 4K8K broadcasting, and including an encrypted 1c key (Kw) included in the third service signal receiving 1c control information (EMM) of said third entity, 2c control information (ECM) of said third entity including encrypted 2c key (Ks) and third scrambled content; 3 tuners and
a descrambler that descrambles the first scrambled content, the second scrambled content and the third scrambled content output from the first tuner, the second tuner and the third tuner;
The 1a control information (EMM) of the first entity and the 2a control information (ECM) of the first entity, the 1b control information (EMM) of the second entity and the 1st a buffer for storing the 2b control information (ECM) of the second entity, the 1c control information (EMM) of the third entity and the 2c control information (ECM) of the third entity; and,
a control unit that controls the first tuner, the second tuner, the third tuner, the descrambler, and the buffer;
Controlled by the control unit, the 1a control information (EMM) of the first entity, the 1b control information (EMM) of the second entity, and the 1c control of the third entity Obtaining said 1a key (Kw), said 1b key (Kw) and said 1c key (Kw) from information (EMM) using a unique 3a key (Km), said first business entity The 1a key obtained from the 2a control information (ECM) of the, the 2b control information (ECM) of the second entity and the 2c control information (ECM) of the third entity (Kw), said key 1b (Kw), said key 1c (Kw), said key 2a (Ks), said key 2b (Ks), said key 2c for providing said descrambler; a CAS module for obtaining (Ks);
a first period within 30 seconds in which the control unit transmits a 1a-th command corresponding to the 1a-th control information (EMM) to the CAS module after receiving the 1a-th control information (EMM); , a second period within 30 seconds during which a 1b command corresponding to the 1b control information (EMM) is transmitted to the CAS module after receiving the 1b control information (EMM); and a third period within 30 seconds during which the 1c command corresponding to the 1c control information (EMM) is transmitted to the CAS module after receiving the control information (EMM) in units of business entities. and a minimum of R (an integer equal to or greater than 1) pieces of the 1a-th control information (EMM) during the first period, and a minimum of R (an integer of 1 or more) pieces of the 1b-th control information (EMM) during the second period. means for setting that R (an integer of 1 or more) should be processed and that a minimum of R (an integer of 1 or more) of the 1c-th control information (EMM) should be processed in the third period;
During the period from when the 1a-th control information (EMM) is received until the 1a-th command transmission corresponding to the 1a-th control information (EMM) is performed to the CAS module within the first period, means for transmitting a 2a command corresponding to the 2a control information (ECM) of the first entity received by the first tuner to the CAS module; and corresponding to the 1b control information (EMM). the second control information (EMM) received by the second tuner until the transmission of the 1b command to the CAS module within the second period after receiving the 1b control information (EMM). means for transmitting a 2b command corresponding to the 2b control information (ECM) of the business entity to the CAS module;
During the period from when the 1c control information (EMM) is received until the 1c command transmission corresponding to the 1c control information (EMM) is performed to the CAS module within the third period, means for transmitting a 2c command corresponding to the 2c control information (ECM) of the third entity received by the third tuner to the CAS module;
Said 1a control information (EMM) of said first entity received by said first tuner, said 1b control information (EMM) of said second entity received by said second tuner, said third tuner fetching a plurality of the 1c control information (EMM) of the third business entity received by each of the first period, the second period, and the third period within 30 seconds and storing them in the buffer; transmission of the 1a command corresponding to one of the plurality of 1a control information (EMM) captured within the 30 seconds, transmission of the 1b command corresponding to the 1b control information (EMM), and transmission of the 1c control When the 1c command transmission corresponding to the information (EMM) is performed to the CAS module, the 1a control information (EMM), the 1b control information (EMM), the 1c control information (EMM) remaining in the buffer means for discarding or suppressing control information (EMM).

FIG. 1 is a diagram showing a configuration example of an entire system including a broadcasting station and a receiver (also referred to as a receiver) according to one embodiment. FIG. 2 is a diagram schematically showing the main configuration of broadcasting station 200. As shown in FIG. FIG. 3 is a diagram showing in detail the configuration of the receiver according to one embodiment. FIG. 4A shows a conceptual diagram of the conditional access system described in Non-Patent Document 1. FIG. FIG. 4B shows the ECM for terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting, the scrambling key (Ks) included therein, and the target broadcast to be descrambled using the scrambling key (Ks) It is a figure which shows the temporal relationship of a signal. FIG. 4C is a conceptual diagram of the conditional access system described in Non-Patent Document 2. As shown in FIG. FIG. 5 is a basic configuration diagram when the receiver performs descrambling, described in Non-Patent Document 4. In FIG. FIG. 6 is a processing flowchart of conditional access processing performed by the receiver shown in FIG. FIG. 7 is a diagram conceptually showing the update period of the scramble key (Ks) and the processing of ECM and EMM. FIG. 8 is a diagram showing the basic configuration of a receiver for descrambling broadcast waves in the case of having two tuners, in contrast to the basic configuration of the receiver having one tuner shown in FIG. FIG. 9 is a diagram showing the basic configuration of a receiver for descrambling broadcast waves when having three tuners, in contrast to the basic configuration of the receiver having two tuners shown in FIG. FIG. 10 is a diagram showing temporal relationships among ECM, EMM, and scrambling key (Ks). FIG. 11 illustrates the timing at which the transmitting side described in Non-Patent Document 4 transmits an ECM containing a scramble key (Ks) and the timing at which a video signal descrambled using the scramble key (Ks) included in the ECM is transmitted. It is what I did. FIG. 12 is an explanatory diagram relating to an implementation example of conditional access of a receiver in a transmitting/receiving 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 added to the basic configuration of the receiver shown in FIG. FIG. 14 is an explanatory diagram relating to an implementation example of conditional access of the receiver shown in FIG. FIG. 15 is a basic configuration diagram of an advanced BS digital broadcast and advanced broadband CS digital (hereinafter referred to as 4K8K) broadcast receiver described in Non-Patent Document 5. As shown in FIG. FIG. 16 is a basic configuration diagram of another receiver for descrambling broadcast waves in the case of having three tuner units in contrast to the receiver having the basic configuration of FIG. 17 is an explanatory diagram relating to an implementation example of conditional access of the receiver shown in FIG. 16. FIG. FIG. 18 is another embodiment, showing a basic configuration example of a receiver having two tuner sections for 4K8K reception and three tuner sections for 2K reception. 19 is an explanatory diagram relating to an implementation example of conditional access of the receiver shown in FIG. 18. FIG. FIG. 20, like FIG. 12, is an explanatory diagram relating to an implementation example of conditional access of the receiver. FIG. 21A shows a first tuner section (4K8K) 1801-1, a second tuner section (4K8K) 1801-2, a third tuner section (2K) 1801-3, and a fourth tuner section in the receiver shown in FIG. (2K) 1801-4, a diagram showing an example of a time chart for receiving ECMs and EMMs from the fifth tuner unit (2K) 1801-5. FIG. 21B is a diagram showing a temporal transition in which the integrated CAS module of FIG. 18 processes the ECM/EMM shown in FIG. 21A as ECM and EMM. FIG. 22 is a flowchart for the receiver to request the CAS module to process the ECM and EMM in order to give top priority to the ECM process of the 2K broadcast, which has been described with reference to FIGS. 21A and 21B. FIG. 23 is a diagram showing an example of an EMM reception buffer having a storage area for storing EMM reception times. FIG. 24 is a data processing flowchart of a receiver according to an embodiment that operates according to a predetermined rule; FIG. 25 is a processing flowchart shown in FIG. 10 is a processing flowchart of EMM reception by the receiver when a provision is added that "the EMM received later is discarded if it already exists in the receiver."

Embodiments will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration example of an entire system including a broadcasting station and a receiver (also referred to as a receiver) according to one embodiment.

A broadcasting station 100 comprises a broadcasting station server 101 , a first security function 102 and a first basic function 103 .

A first basic function 103 is a basic function of the broadcasting station 100, which encodes and multiplexes video signals, audio signals, etc. of programs to be broadcast, and broadcast signals (broadcast signals are digital television broadcasting, BS digital broadcasting, broadband CS digital broadcasting, advanced BS digital broadcasting, advanced broadband CS digital broadcasting, etc.). Therefore, the transmission signal is assumed to include the route via the satellite. Alternatively, the transmitted signal may include a route through a cable.

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

The broadcasting station server 101 is an area for pre-storing metadata such as program titles, program IDs, program summaries, performers, broadcasting dates and times, and other data in order to transmit them to receivers by means of broadcasting signals.

The first security function 102 can make settings related to protection of contents (programs) included in broadcast waves sent out by broadcasting stations.

A service provider device (sometimes referred to as a service provider) 120 cooperates with the broadcasting station 100 to create and manage content in a service that simultaneously provides application functions added to programs broadcast by the broadcasting station 100. , provide (also called distribution). Service provider device 120 includes application management/distribution 121 and application server 122 .

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

The application server 122 is an area that stores content and applications to be provided to the receiver 140 .

In response to a request from the receiver 140 that has received the first designation information, the service provider device 120 distributes the applications and contents stored in the application server 122 through the application management/distribution 121 to a communication network such as the Internet. to the receiver 140 via.

The receiver 140 includes a digital broadcast reception function (second basic function 141), a communication control unit 142, a second security function 143, an application management function 144, an API (Application Programming Interface) 145, an application 146, and It includes a control unit 147, receives a broadcast signal broadcast from the broadcasting station 100, receives various broadcast programs and various service information, and acquires and operates an application from the service provider device 120 via a communication network. can be

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

The second basic function 141 is to connect peripheral devices connected to the receiver 140, such as a display device 160, an HDD (Hard Disk Drive) 162 bound to the receiver 140, and a removable media 170, and to transmit and receive data. also manages

The application management function 144 manages applications that the receiver 140 has in advance and applications acquired via a communication network. Also, 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 an 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 applications and contents managed by the service provider device 120 via the communication network.

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

FIG. 2 is a diagram schematically showing the main configuration of a broadcasting station 200 (corresponding to 100 in FIG. 1). Broadcasting station 200 generates auxiliary data including video encoder 201, audio encoder 202, caption encoder 203, control data such as transmission control signals, service data, and application control information for controlling application 145 operating in receiver 140. An 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 section 213 cooperate with each other. The video encoder 201, the audio encoder 202, the caption encoder 203, the attached data generator 204, the multiplexer 205, the scrambler 206, the transmitter 207, and the transmitter/receiver 213 together form a first basic function 210 (corresponding to 103 in FIG. 1). ).

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

As for the multiplexing method, the multiplexing method of MPEG-2 Systems or the multiplexing method of MMT (Mpeg Media Transport) may be used, or both may be used together. Also, the multiplexing method is not limited to this.

Each output of the video encoder 201 , the audio encoder 202 , the caption encoder 203 , and the attached data generation section 204 is streamed, and these streams are multiplexed in the multiplexing section 205 . A multiplexed stream (broadcast signal) is scrambled by a scrambler 206, sent to a transmitter 207 as a scrambled multiplexed stream, and transmitted from an antenna via broadcast waves.

The transmission control signal generated by the attached data generator 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 one embodiment. The receiver 300 has a second basic function 315 (corresponding to 141 in FIG. 1) which is a reception function for receiving broadcast waves.

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

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

The demultiplexer 304 separates the multiplexed stream into a video stream, an audio stream, a data broadcasting stream, a caption stream, and ancillary data, and sends the video stream to the video decoder 306, the audio stream to the audio decoder 307, and the data broadcasting stream. is input to the data broadcast reception processing unit 305, the caption stream is input to the caption decoder 308, and the ancillary data is input to the analysis unit 309, respectively.

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 .

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

Also, the data broadcast stream separated by the demultiplexer 304 is sent to the data broadcast reception processing unit 305, where reception processing is performed. The data broadcasting reception processing unit 305 extracts a display signal to be displayed on the display device 328 as data broadcasting from the data broadcasting stream sent from the demultiplexer 304, and inputs the extracted display signal to the data broadcasting engine 310. . The data broadcasting engine 310 analyzes the sent display signal and outputs the analyzed content to the display control section 327 via the synthesizer 326 . 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 caption signal are synthesized by the synthesizer 326 and output to the display device 328 via the display control section 327 . The display control unit 327 performs setting of gamma characteristics, setting of display screen size, setting of display signal level, and the like.

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

Note that FIG. 3A shows an example in which the display 328 and the speaker 329 are built in the receiver 300, but an external display and speaker connected via an I/F such as HDMI may be used. good. The display control unit 327 controls the content displayed on the display 328 even when the display 328 is an external display 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 analysis results to the control unit 330 as needed.

The transmission control signal contained in the control data contains channel identification information and program identification information of the multiplexed video signal program, and further application functions are performed for this multiplexed video signal program. It contains first designation information indicating that a service to be provided at the same time is added. 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 results to the control unit 330 as needed.

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

The second security function 322 reads out information regarding content protection from the transmission control signal included in the broadcast wave, and when outputting to other devices (not shown) on the home network via the network I/F 341, , content protection processing is performed when outputting to connected peripheral devices (not shown, corresponding to 162 and 170 in FIG. 1). The API 324 is an I/F for the cooperative operation of the application management function 323 and the application 325 .

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

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

Further, the control unit 330 decrypts the ECM and EMM sent from the analysis unit 309 to the CAS module 303 in order to extract the scrambling key (Ks) required for descrambling. give instructions to do so. The CAS module 303 decrypts the ECM and EMM and extracts the scramble key (Ks) based on the instruction from the control unit 330 . After 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 CAS module 303 , control unit 330 transmits the received scramble key (Ks) to descrambler 302 . When descrambler 302 receives a scramble key (Ks) from control unit 330, descrambler 302 internally sets the received scramble key (Ks). The descrambler 302 descrambles the scrambled broadcast signal using an internally stored scramble key (Ks).

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

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

This system is generally called a triple key system, and uses three keys: a scramble key (Ks) 401, a work key (Kw) 402, and a master key (Km) 403.

A scramble key (Ks) 401 , a work key (Kw) 402 and a master key (Km) 403 are keys managed by the broadcasting station 200 . An encryption unit 405 that encrypts the ECM using the work key 402 and an 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 decoding unit managed by the CAS module 303 inserted in the . The descrambler 420 that descrambles the broadcast wave using the scrambling key (Ks) obtained from the CAS module 303 is the descrambler 302 managed by the receiver 300 shown in FIG.

Broadcasting station 200 generates ECM 410 including a scramble key (Ks) and EMM 411 including a work key (Kw) at each required timing. The broadcasting station 200 multiplexes the generated ECM 410 and EMM 411 with other program contents, etc., scrambles them with a scrambler 400 using a scramble key (Ks) 401 transmitted by broadcast waves at that time, and scrambles them by broadcast waves. Send.

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

The purpose of conditional access is to ensure that only subscribers who have acquired the right to view programs broadcast by a particular station can view programs broadcast by that station. For this reason, only the subscriber's receiver 300 needs to be able to retrieve the scramble key (Ks) 421 sent by broadcast waves.

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

The EMM 411 is related information in receiver identification units (CAS module ID units) transmitted by the broadcasting station 200 . EMM 411 contains work key (Kw) 402 used to encrypt ECM 410 . This EMM 411 is encrypted by the encryption unit 406 with the master key (Km) 403 . That is, the receiver 300 selects the installed CAS from the EMM, which is related information in receiver identification units (CAS module ID units) linked one-to-one with the master key (Km) broadcast by the broadcasting station 200. If the EMM addressed to itself can be recognized by the CAS module ID (card ID) obtained from the module 303, the encrypted EMM is decrypted using the master key (Km) hidden in the CAS module (IC card). The work key (Kw) contained therein can be retrieved, and the work key (Kw) retrieved can be used to decrypt the encrypted ECM to retrieve the scramble key (Ks) contained therein.

The master key (Km) 423 is stored confidentially in the CAS module (IC card). When a subscriber acquires the right to view a program broadcast by a specific broadcasting station 200, the subscriber applies to the broadcasting station for the CAS module ID (card ID), which is the identification information of the CAS module (IC card) 303. The broadcast station 200 can determine the master key (Km) 423 of the subscriber's CAS module 303 corresponding to the requested CAS module ID (card ID) by means of a key management system (not shown) managed by the broadcasting station 200. . In this way, the broadcast station 200 can obtain the same master key 403 as the master key 423 of the subscriber's CAS module 303 from the aforementioned key management system.

In other words, the broadcasting station 200 can encrypt the EMM 411 using the master key (Km) 403 with the information CAS module ID (card ID) obtained at the time of the subscriber's application. Furthermore, the broadcasting station 200 can set the EMM 411 to be transmitted for each subscriber by setting the CAS module ID (card ID) information obtained at the time of subscriber's application in the unencrypted portion of the EMM 411. can.

The receiver 300 extracts the EMM 411 addressed to itself from the CAS module ID (card ID) information in the unencrypted portion of the received EMM 411 and transmits the extracted EMM 411 addressed to itself to the CAS module 303 . The CAS module 303 that has received the EMM 411 decrypts the EMM 411 with a decryption unit 426 using a master key (Km) 423 that is stored confidentially inside, and extracts a work key (Kw) 422 . Furthermore, 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 contained therein. The CAS card module 303 transmits the extracted scramble key (Ks) 421 to the control section 330 . Control unit 330 having received scramble key (Ks) 421 transmits the received scramble key (Ks) to descrambler 420 . Descrambler 420 receives the scramble key (Ks) from control unit 330 and sets the received scramble key (Ks) inside.

A descrambler 420 of the receiver 300 descrambles 420 received broadcast waves using an internally set scramble key (Ks) 421, and provides program content contained in the broadcast waves to the user.

As described above, the broadcasting station 200 sends an ECM having the scrambling key (Ks) of the descrambled video prior to the descrambled video.

FIG. 4B shows the ECM for terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting, the scrambling key (Ks) included therein, and the target broadcast to be descrambled using the scrambling key (Ks) It is a figure which shows the temporal relationship of a signal.

440 is the temporal transition of the broadcast signal of the program received by the receiver 300 . 441 indicates temporal transitions of the scrambling key (Ks) used to descramble the broadcast signal 440 . Ks0, Ks1, Ks2 are the scrambling keys (Ks) used to descramble the broadcast signal. A scrambling key (Ks) used to descramble the broadcast signal is updated every 2000 ms.

442 represents the temporal transition of the ECM received by the receiver 300 and the scrambling key (Ks) contained therein. ECM1 contains the scrambling keys Ks0 and Ks1, ECM2 contains the scrambling keys Ks1 and Ks2, and ECM3 contains the scrambling keys Ks2 and Ks3. Thus, the ECM can store both ODD (odd) and EVEN (even) scramble keys (Ks).

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

The timing at which the receiver 300 receives this ECM2 is the timing of T20, which precedes T11 by 1600 ms. In this way, the receiver 300 receives the scrambling key (Ks) prior to the broadcast signal to be descrambled, so that the received broadcast signal can be descrambled without delay.

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

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

In broadcasting, since the same signal is sent to all receivers, if the scrambling key (Ks) is used continuously for a long period of time, all the keys corresponding to the length of the key are lost because the scrambling method itself is a public method specified in the ministerial ordinance. It is possible to analyze Ks by a round-robin or the like. If such a situation occurs, the purpose of conditional access cannot be achieved. Therefore, in current broadcasting, a scrambling key (Ks) that changes with time is used. Non-Patent Document 1 defines the use time of the same Ks to be about 1 second per ECM at the shortest.

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

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

Receiver 500 includes tuner section 501 (corresponding to 301 in FIG. 3), descrambler 502 (corresponding to 302 in FIG. 3), TS (Transport Stream) decoding section 503 (corresponding to 304 in FIG. 3), and video/audio decoding. Unit 504 (corresponding to 306 and 307 in FIG. 3), display unit 505 (corresponding to 327 in FIG. 3), control unit 506 (corresponding to 330 in FIG. 3), and key input unit 507 (corresponding to 342 in FIG. 3) include. The TS decoding unit 503 analyzes the received descrambled broadcast signal, sequentially extracts transmission control signals, and transmits them to the control unit 506 . Control section 506 can control tuner section 501 , descrambler 502 and display section 505 based on the transmission control signal sent from TS decoding section 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 commands given from the control unit 506 and extracting a work key (Kw) and a scramble key (Ks). be. A receiver 500 in FIG. 5 is a case in which one tuner section is mounted.

FIG. 6 is a processing flowchart of conditional reception processing performed by the receiver 500 shown in FIG.

When a user selects a specific channel (service_id) by operating the remote control 510, the control unit 506 determines whether a PMT (Program Map Table) of the service_id is transmitted in the broadcast wave currently being received by the TS decoding unit. The PAT (Program Association Table) extracted in 503 is received and determined (S601).

If it is not transmitted as a result of the determination (No in S603), the control unit 506 refers to the NIT (Network Information Table) sent from the TS decoder 503 and selects the broadcast wave that transmits the service_id. Therefore, tuner section 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 among the received EMMs from the card ID information set in the non-encrypted portion of the EMM. After extracting the EMM addressed to itself based on the card ID information, the control unit 506 transmits the EMM to the IC card 511 . The IC card 511 that has received the EMM from the control unit 506 decrypts the encrypted EMM using the master key (Km) held therein, extracts and stores the work key (Kw) (S611).

Further, the control unit 506 refers to the received PAT (S605), receives the PMT of the service_id to be tuned (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 encrypted ECM using the extracted work key (Kw) and extracts the scramble key (Ks) (S612).

When the IC card 511 normally extracts 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 reception command.

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

Descrambler 502 descrambles the broadcast signal sent from 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 and audio signals are output to a monitor and speakers (not shown).

If the EMM has not been received even if the contract has not been made or the contract has been made, the CAS module (IC card) returns a response indicating that the EMM has not been received, such as non-contract, 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 ECM and EMM update cycles and the processing of the CAS module (IC card) will be described.

As described above, in Non-Patent Document 1, the update period of the scramble key (Ks), that is, the update period 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 the capability to process ECM and EMM during this 1-second update of the scramble key (Ks). (IC card).

In order to process a plurality of channels (a plurality of tuners) with a single 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 that a plurality of ECMs and EMMs can be processed within the update period of the scramble key (Ks) of 1 second by increasing the performance of .

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/Resend in this volume. Timing according to the processing capacity of the IC card is as follows: ・Assuming a maximum processing time of 800 ms for one ECM ・The update interval between different ECMs is 1000 ms or more Based on the assumptions, receiver specifications are assumed. With the revision of this document ver1.0, the update cycle has been reviewed with the following assumptions.・While watching BS broadcasting on the TV screen, BS counterprogram recording can be processed with a single IC card.・Similarly, 2 screens of arbitrary BS channels can be displayed at the same time with a single IC card. From the above, if the ECM update interval is 2000 ms or more, at least two scrambled services for different TS inputs can be processed with one IC card. ”
In other words, a CAS module (IC card) conforming to Non-Patent Document 1 can process a scramble key (Ks) update cycle of 1 second. It becomes possible to process two channels (two tuners).

In other words, by setting the ECM update cycle to 2 seconds, if it is a CAS module (IC card) conforming to Non-Patent Document 1, operation rules allow up to 2 channels (2 tuners) regardless of its command response performance. I did.

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

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

702 shows 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. 702-1 is the state of ECM and EMM processing for the first tuner section, and 702-2 is the state of ECM and EMM processing for the second tuner section.

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

FIG. 8 is a basic configuration diagram of a receiver 800 when descrambling broadcast waves when having two tuner sections, in contrast to the basic configuration of the receiver having one tuner section shown in FIG. is. The difference between FIG. 8 and FIG. 5 is that one tuner section is added and is composed of a first tuner section 801-1 and a second tuner section 801-2. 813 is added, and a built-in video recording/recording unit 812 is added. Otherwise, 802 to 810 and 811 are the same as 502 to 510 and 511 in FIG.

The receiver 800 has two tuner sections, a first tuner section 801-1 and a second tuner section 801-2, so that a program selected by one tuner section is output to a monitor while simultaneously outputting to the monitor the other tuner section. A program selected by , which is different from the program being output to the monitor, can be recorded and stored in the recording/recording unit 812 . A recording/recording unit 812 is, for example, a built-in HDD (hard disk drive).

Processing when the first tuner unit 801-1 selects the broadcast wave of channel 1 for monitor output, and the second tuner unit 801-2 selects the broadcast wave of channel 2 recorded by the recording/recording unit 812 at the same time. explain.

When the user selects channel 1 (service_id_1) to be output to the monitor by operating the remote controller 810, the control unit 806 extracts in the TS decoding unit 803 whether the PMT of service_id_1 is being transmitted in the broadcast wave currently being received. receive and judge the PAT.

If it is not transmitted as a result of determination, the control unit 806 refers to the NIT sent from the TS decoding unit 503 and controls the first tuner unit 801-1 to select the broadcasting wave on which service_id_1 is transmitted. do.

The control unit 806 recognizes the PID of the EMM included inside the CAT arranged in the selected broadcast wave and receives the EMM. The control unit 806 determines the EMM addressed to itself from among the received EMMs from the card ID information set in the non-encrypted portion of the EMM. After extracting 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) held therein, extracts and stores the work key (Kw).

Also, the control unit 806 refers to the received PAT, receives the PMT of service_id_1 to be tuned, 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 encrypted ECM using the extracted work key (Kw) and extracts the scramble key (Ks).

When the IC card 811 normally retrieves 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 reception command.

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

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

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

In reserved recording, a user reserves recording 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 in accordance with the setting contents of the recording reservation, and selects the channel reserved for recording when the time comes near the start time of the program reserved for recording.

The control unit 806 receives the EMM by recognizing the PID of the EMM included inside the CAT arranged in the selected broadcast wave. The control unit 806 determines the EMM addressed to itself from among the received EMMs from the card ID information set in the non-encrypted portion of the EMM. After extracting 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) held therein, extracts and stores the work key (Kw).

The control unit 806 also refers to the PAT to receive the PMT of service_id_2 to be tuned, recognizes the ECM PID contained 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 a single IC card (one CAS module) that processes the ECM contained in the broadcast wave selected by the first tuner unit 801-1 and the channel selected by the second tuner unit 801-2. It is necessary to perform both ECM processing included in broadcast waves.

The processing of the IC card 811 is started in response to a request from the receiver. The rule is that the control unit 806 cannot transmit the next request to the IC card 811 until a response is returned from the IC card 811 to the control unit 806 .

Therefore, when receiving ECMs continuously from the TS decoding unit, the control unit 806 adjusts the timing of requesting ECM processing in consideration of the ECM retransmission cycle, etc., and issues an ECM reception command requesting processing. do.

Similarly, in the EMM processing, the IC card 811 processes the EMM included in the broadcast wave selected by the first tuner unit 801-1 and the EMM processing included in the broadcast wave selected by the second tuner unit 801-2. Therefore, the control unit 806 adjusts the timing of requesting the EMM processing so that it does not overlap with the timing of requesting the ECM processing, and sends the data to the IC card 811. Issue a command to

When IC card 811 processes the ECM contained in the broadcast wave selected by first tuner section 801-1, it 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 and extract the scramble key (Ks). When the IC card 811 can decode the EMC and extract 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 reception command.

Upon receiving the scramble key (Ks), control section 806 transmits the received scramble key (Ks) to descrambler 802 . The descrambler 802 internally sets the received scrambling key (Ks). The descrambler 802 descrambles the broadcast wave selected by the second tuner section 801-2 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, the TS format encrypted with a unique key for device binding) and recorded in the recording/recording unit 812. FIG.

When reproducing a 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 video/audio decoding is performed. A unit 804 outputs to a monitor.

Additionally, the receiver may be equipped with more than two tuners.

If the receiver is equipped with three or more tuners, for example, if the receiver is compatible with a so-called double recording function that can simultaneously record two different channels other than the program being viewed, ECM processing and EMM processing become complicated. Become.

If one CAS module (IC card) can handle up to two channels, two CAS modules (IC cards) need to be installed in order to reliably process three tuners.

FIG. 9 is a diagram showing the basic configuration of a receiver 900 for descrambling broadcast waves with three tuners, in contrast to the basic configuration of the receiver with two tuners shown in FIG. .

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

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

When the user selects channel 1 (service_id_1) to be output to the monitor by operating the remote control 810, the control unit 906 causes the TS decoding unit 903 to extract whether the PMT of service_id_1 is being transmitted in the broadcast wave currently being received. receive and judge the PAT.

If it is not transmitted as a result of determination, the control unit 906 refers to the NIT sent from the TS decoding unit 903 and controls the first tuner unit 901-1 to select the broadcasting wave on which service_id_1 is transmitted. do.

The control unit 906 receives the EMM by recognizing the PID of the EMM included inside the CAT allocated to the selected broadcast wave. The control unit 906 determines the EMM addressed to itself from among the received EMMs based on the card ID information set in the non-encrypted portion 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 that has received the EMM from the control unit 906 decrypts the encrypted EMM using the master key (Km) held therein and extracts the work key (Kw). and save.

The control unit 906 also refers to the received PAT, receives the PMT of service_id_1 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 either 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 that has received the ECM reception command decrypts the encrypted ECM using the extracted work key (Kw) to extract the scramble key (Ks).

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

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

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

For reserved recording, the user reserves the recording of a desired program on two different channels at the same time using an electronic program guide (EPG, not shown) or the like. When the time comes near the start time, the second tuner section 901-2 and the third tuner section 901-3 are controlled to select the channel reserved for recording.

The control unit 906 receives the EMM by recognizing the PID of the EMM, which is included inside the CAT allocated to the selected broadcast wave. , the control unit 906 determines the EMM addressed to itself from among the received EMMs from the card ID information set in the non-encrypted portion of the EMM. When the control unit 906 extracts the EMM addressed to itself based on the card ID information, 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 that has received the EMM from the control unit 906 decrypts the encrypted EMM using the master key (Km) held therein and extracts the work key (Kw). and save.

The control unit 906 also refers to the PAT to receive the PMT of service_id_2 to be tuned, recognizes the ECM PID contained in the received PMT, and receives the ECM. Upon receiving the ECM, the control unit 906 issues an ECM reception command to the predetermined first IC card 911-1 or second IC card 911-2.

The IC cards 911-1 and 911-2 are provided with 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 second IC card 911-2, which are CAS modules that perform CAS processing, on a setting screen such as a user interface. (not shown).

For example, the first tuner section 901-1 and the second tuner section 901-2 are processed by the first IC card 911-1, and the third tuner section 901-3 is processed by the second IC card 911-2. shall be In this case, a subscription contract is made in order to acquire the right to view channels A, B, and C provided as pay television with the information of the card ID of the first IC card 911-1, and the card ID of the second IC card 911-2 is entered. If you make a subscription contract to acquire the right to view channels D, E, and F provided as pay broadcasts, for example, if you watch channel C and record channels A and F at the same time, If the first tuner section 901-1 selects channel C, the second tuner section 901-2 selects channel A, and the third tuner section 901-3 selects channel F, then the contracted pay broadcast can be selected. Channels can be associated with the first IC card 911-1 and the second IC card 911-2.

However, when the broadcast wave of channel A is to be processed by the third tuner unit 901-3, since the second IC card 911-2 has not contracted to view the broadcast wave of channel A, the second IC card 911-2 cannot extract the EMM containing the contract information for viewing channel A, and as a result, the broadcast wave of channel A cannot be descrambled. Also, if one IC card (CAS module) subscribes to three different channels (for example, channels A, B, and C) and receives EMM, one of these three channels may be viewed or viewed at different times. Recording is possible, but it is conceivable that channels B and C are simultaneously recorded while viewing channel A. However, as described above, as described in Non-Patent Document 4, in a limited state in which one IC card can only process TS of two channels (tuners) at the same time, one IC There is a problem that the card cannot process TS of three different channels at the same time.

Therefore, in the present embodiment, attention is paid to the following points as main points.

In the present embodiment, for the convenience of the user, in a receiver equipped with a plurality of tuners, it is possible to reduce the user's burden of setting the linking relationship between the plurality of tuners and the plurality of IC cards, and to reduce the cost as much as possible. Create a rule to enable processing with an IC card (CAS module).

Therefore, for example, it is important to be able to strictly examine the number of tuners capable of simultaneous reception processing 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, and command response performance described in the specifications of the CAS module (IC card). It specifies the frequency of sending EMMs or the number of EMMs that a receiver should process within a certain period of time per entity. In other words, what is newly specified is the number of EMMs to be processed within a certain period of time. Whether the number of EMMs to be transmitted within a certain period of time is specified as a transmission rule, or the number of EMMs to be processed within a certain period of time is specified as a receiver rule. is a means of This makes it possible to strictly examine how many tuners can perform simultaneous reception processing with one CAS module (IC card). This provides convenience for receiver manufacturers.

The outline of the main points in this embodiment can be summarized as follows.
(1). EMM and/or EMM individual message sent to the same receiver (CAS module ID) per ECM retransmission cycle, update cycle, and per entity in broadcasting that operates an access control system (conditional access system or content protection system) Digital broadcast transmission/reception equipment that specifies the transmission frequency of

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

(2). In broadcasting that operates an access control system (conditional access system or content protection system), when receiving, viewing, or recording/recording more than two at the same time, the retransmission cycle and update cycle of ECM and the same reception per business entity The transmission frequency of EMMs and/or EMM individual messages to be sent to the receiver (CAS module ID) is set, and the grace period from the reception of the EMM and/or EMM individual messages addressed to the receiver to the issuance of commands to the CAS module A digital broadcast receiving apparatus for controlling the issuing schedule of EMM and/or EMM individual message processing of each of a plurality of installed tuners in a period based on the EMM and/or EMM individual message transmission frequency to a CAS module.

(2b). In broadcasting that operates an access control system (conditional access system or content protection system), when receiving, viewing, or recording/recording more than two at the same time, the retransmission cycle and update cycle of ECM and the same reception per business entity The number of EMMs and/or EMM individual messages that need to be processed during the grace period from the reception of EMMs and/or EMM individual messages sent to the machine (CAS module ID) to the issuance of a command to the CAS module. A digital broadcast receiver that controls the publication schedule.

(3). In broadcasting that operates an access control system (conditional access system or content protection system), EMMs and/or EMM individual messages sent to the same receiver (CAS module ID) per broadcaster are sent at a predetermined frequency. A digital broadcasting transmitter that controls to

(4). (1) above. , the transmission frequency of EMMs and/or EMM individual messages addressed to one CAS module ID is defined by the number of EMMs to be transmitted during the grace period from the reception of EMMs to the issuance of commands to the CAS module. Broadcast transmitter/receiver.

(5). (1) above. 2. A digital broadcast transmitting/receiving apparatus in which the transmission frequency of EMMs and/or EMM individual messages addressed to one CAS module ID is defined by the number of EMMs and/or EMM individual messages transmitted per ECM or scramble key update period.

(6). (1) above. , the transmission frequency of EMMs and/or EMM individual messages addressed to one CAS ID during the grace period from the reception of EMMs and/or EMM individual messages to the issuance of commands to CAS modules A digital broadcast transmitting/receiving device defined by the number of EMMs and/or EMM individual messages transmitted and the number of EMMs and/or EMM individual messages transmitted per ECM or scrambling key update cycle.

(7). (2) above. , the EMM to be sent to the CAS module is controlled 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 receiver controlled by the number of EMM individual messages.

(8). (2) above. , the control of the issuance schedule to the CAS module is performed by ECM or scrambling during the grace period from the reception of the EMM and/or EMM individual message addressed to the CAS module to the issuance of the command to the CAS module A digital broadcast receiver controlled by the number of EMMs and/or EMM individual messages sent per key update cycle.

(9). (2) above. , the control of the issuance schedule to the CAS module is performed 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 broadcasting receiver controlled by the number and the number of EMMs and/or EMM individual messages sent per ECM or scramble key update cycle.

(10). (3) above. , the transmission frequency of the EMM/EMM individual message to be sent to the same receiver shall be from the reception of the EMM and/or 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 the number of EMMs and/or EMM individual messages that are transmitted during a grace period.

(11). (3) above. 2. A digital broadcasting transmitting apparatus according to claim 1, wherein the transmission frequency of EMMs and/or EMM individual messages transmitted to the same receiver is controlled by the number of EMMs and/or EMM individual messages transmitted per ECM or scramble key update period.

(12). (3) above. , the transmission frequency of EMMs and/or EMM individual messages to be sent to the same receiver shall be the delay from the reception of EMM/EMM individual messages addressed to the CAS module to the issuance of commands to the CAS module. A digital broadcast transmitting apparatus that controls the number of EMMs transmitted in a period and the number of EMMs and/or EMM individual messages transmitted per ECM or scramble key update period.

Next, it will be described from the background that the present embodiment exhibits useful functions.

According to conventional standards and operational regulations, the following must be considered in order to enable simultaneous processing of two different tuners in one CAS module (IC card). Therefore, when assuming a built-in receiver with three or more tuners, in addition to the conventional standards and operation standards, the command / It is necessary to grasp the performance required for response.

However, even if the ECM and EMM command response performance of this CAS module (IC card), ECM transmission frequency, update cycle, and grace period until EMM reception and processing are determined, exactly how many tuner processes can be performed? is difficult to examine in detail.

Since the ECM is generally updated every few seconds, even if the retransmission cycle is sent every 100 ms, the ECM processing has to be prioritized when multiple tuners are installed.

On the other hand, EMM has an attribute that does not require immediate processing compared to ECM, but depending on the situation, it may require processing as soon as possible, although it is not as immediate as ECM. For example, (a) Viewer A, who wants to acquire the right to view a program broadcast by a specific broadcasting station (business entity), asks the customer center of the subscribing broadcasting station (business entity) for procedures related to subscription and troubleshooting at the time of subscription. , select the channel of the broadcasting station with your own receiver according to the guidance on the phone, and tell the card ID number of the receiver of viewer A. (c) Viewer A's receiver receives the EMM and retrieves the scramble key (Ks). , it is possible to descramble the broadcast signal of the channel (so-called unlocking is possible) (d) This allows viewer A to confirm the completion of the contract procedure.
In the cases of scenes (a) to (d) above, although EMM processing is not as immediate as ECM processing, it is a reality that there are cases where processing is required as quickly as possible.

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

The receiver may control the reception of ECM so that at least one ECM is received within the period of using the same Ks in accordance with the update of the scramble key (Ks), but the EMM is based on whether the contract is possible or not. Since the receiver does not control the reception of EMMs, it receives all EMMs sent to itself, and sends all received EMMs to the CAS module (IC card) to request processing. It is considered basic to

Therefore, after the receiver receives the EMM, it is desired that the CAS module (IC card) is processed with a certain period of time. For this reason, in the ARIB standard, in accordance with the response performance of the CAS module (IC card) indicated by the CAS module provider, the EMM reception command is issued to the CAS module (IC card) after the receiver receives the EMM. A grace period has been stipulated.

According to this regulation, assuming that EMMs are sent to the same CAS module (IC card) only infrequently, there is virtually no problem. It is also assumed that multiple EMMs are sent in a short period of time.

Recently, the number of tuners installed has increased, receivers equipped with a multi-channel recording function, and non-patent document 5, Part 1, Part 5, Appendix 7, CAS for advanced wideband BS/CS broadcasting (so-called 4K8K broadcasting) A provision has been made that the CAS of the current broadband satellite broadcasting (so-called 2K broadcasting) may be installed in an integrated CAS module.

In Appendix 7 it states:
"Appendix 7 Common receiver for current broadcasting and advanced BS digital broadcasting Reception of advanced BS digital broadcasting and BS digital broadcasting/wideband CS digital broadcasting specified in ARIB TR-B15 or terrestrial digital TV specified in ARIB TR-B14 The rules for applying the same CAS module to the reception of BS digital broadcasting/broadband CS digital broadcasting and terrestrial digital television broadcasting are shown below. .

However, there are many receivers that receive current broadband satellite broadcasts (so-called 2K broadcasts), and receivers that receive both advanced wideband satellite broadcasts (so-called 4K8K broadcasts) and current broadcasts (so-called 2K broadcasts) It is quite possible that one CAS module (IC card) will receive and process many channels in the future.

Under these circumstances, in non-patent document 5, non-patent document 3 and non-patent document 4, there are differences in the update period of ECM (scramble key (Ks)), advanced wideband satellite broadcasting (so-called 4K8K) and current broadcasting (So-called 2K), if the ECM or EMM response performance differs, it is essential to consider strict timing control for ECM and EMM processing in the receiver.

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

Therefore, in this embodiment, for example, by specifying the EMM transmission frequency as described in (1) to (12) above, it becomes possible to strictly set the ECM and EMM reception processing timings. It is possible to determine the specification of the number of tuners and to prevent unexpected problems such as missing EMMs.

In the conditional access system with a triple key structure shown in FIG. 4A, in addition to the stipulated content that the ECM update cycle is 2000 ms and the retransmission cycle is 100 ms as technical regulations on the sending side, "EMM is one CAS module ID per business entity. Suppose that a new provision is added to the content of "transmit one in 30 seconds."

FIG. 10 is a diagram showing temporal relationships among ECM, EMM, and scrambling key (Ks) in the conditional access system.

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

The details of the temporal relationship between the scrambling key (Ks) included in the ECM and the scrambling key (ks) for descrambling the broadcast signal using the included scrambling key (Ks) are shown in FIG. 4B. Street.

FIG. 11 shows the timing at which the transmitting side transmits an ECM containing a scramble key (Ks), and descrambling using the scramble key (Ks) included in the ECM, described in Figure 5.8-1 of the fifth edition of Non-Patent Document 3. FIG. 10 illustrates the timing of transmitting the video signal to be used. The horizontal axis is the time axis.

The transmitting side is, for example, a broadcasting station. 1101 indicates a temporal transition in which an ECM containing a scrambling key (Ks) is sent. 1102 indicates temporal transitions of the video signal descrambled using the scrambling key (Ks) included in the ECM.

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

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

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

1202 is the temporal transition of the received ECM. ECM2 is received by the receiver at time T21, and indicates that the ECM contains the scrambling keys (Ks) Ks1 and Ks2. ECM2 is received and a command is issued to the CAS module (IC card). The CAS module (IC card) completes ECM processing during the period from T21 to T12. The CAS module (IC card) transmits the scramble key Ks2 obtained by ECM processing to the receiver. descramble.

Also, when the channel is switched from another channel between T22 and T13, the receiver receives 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 able to process the total value of ECM and EMM within 1000 ms.

As for the performance of the CAS module (IC card) installed in the receiver, for example, if 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)? , is possible through the following considerations.

Assuming that an EMM addressed to the receiver is received during the period from T21 to T12, since EMM processing is not performed at the time of T21, the receiver processes four ECMs during the 1600 ms period from T21 to T12. It is possible (case 1 in FIG. 12).

In other words, in this state only, it seems that the CAS module (IC card) can process up to four tuners.

Next, if the receiver starts processing EMMs received between times T21 and T12 at time T12, the CAS module (IC card) takes 500 ms to process the EMMs. The timing of receiving four ECM processing completion notifications from the IC card) exceeds the time T22 at which descrambling is started using the next scramble key Ks3 by 100 ms. In other words, when the receiver starts processing the timing EMM at T12, it has 1500 ms until T13 when the ECM processing should be finished, and only up to three ECMs can be processed (Case 2 in FIG. 12).

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

An example of the performance of the CAS module (IC card) and the EMM transmission frequency per business entity during the EMM processing grace period has been described above. Next, an embodiment will be described in which more than two tuners are processed by one CAS module (IC card) in a receiver.

Figure 13 shows the basic configuration of the receiver shown in Figure 4.1-1 of Volume 5 of Non-Patent Document 4 shown in Figure 5, with the number of tuner units increased to three and the recording/recording unit added. It is an added block diagram.

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

The three tuner units may be any one of terrestrial digital television broadcasting, BS digital broadcasting, broadband CS digital broadcasting, or tuners capable of selecting three channels, and viewing or recording any three channels according to the specifications of the receiver.・It shall be possible to record.

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

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

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

In the example of FIG. 14, the first tuner unit 1301-1, which is the three tuners shown in FIG. The ECM of each of the channels selected by the second tuner section 1301-2 and the third tuner section 1301-3 and the EMM of at least one of the channels can be processed.

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

In the receiver shown in FIG. 13, as a use case, a case of recording two different programs (so-called double recording) while watching a certain broadcast will be described.

When the user selects channel 1 (service_id_1) by operating the remote controller 1310, the control unit 1306 receives the PAT extracted by the TS decoding unit 1303 to determine whether the PMT of the service_id is being transmitted in the broadcast wave currently being received. and judge.

If it is not transmitted as a result of determination, the control unit 1306 refers to the NIT sent from the TS decoding unit 1303 and selects the broadcast wave to which the service_id_1 is transmitted. Control.

The control unit 1306 recognizes the PID of the EMM from the CAT allocated to 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 among the received EMMs from the card ID information set in the non-encrypted portion of the EMM. After extracting 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 timing at which the control unit 1306 sends the EMM to the IC card 1311 is the timing shown in FIG. The control unit 1306 temporarily saves the received EMM until an appropriate timing for sending the EMM to the IC card 1311 is reached.

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

In addition, using a program table (not shown) by user operation in advance, two channels scheduled to be broadcast at the same time slot, which are different from the channel selected by the first tuner unit 1301-1 and output to the monitor, are selected. Programs A and B are reserved for recording.

When making a reservation for recording, the control unit 1306 stores at least the service_id of the program to be reserved, the program start time (including the date and time), the end time, or the broadcast duration from the start of the program in a memory area (not shown) for schedule management of the recorded program. ). The control unit 1306 manages the schedule so that the recording reservations of the two different channels are selected so 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. The procedure for acquiring EMMs for programs selected by second tuner section 1301-2 and third tuner section 1301-3 is the same as for first tuner section 1301-1.

A channel selected by remote controller 1310 is tuned by first tuner section 1301-1. The control unit 1306 refers to the PAT of the broadcast wave of the program tuned in by the first tuner unit 1301-1, receives the PMT of service_id_1 to be tuned in, 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 .

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

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

Scheduled recording is performed by the user on 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 to select the channel reserved for recording when it is near the start time of the program A reserved for recording, according to the setting contents of the recording reservation.

The control unit 1306 receives the PAT extracted by the TS decoding unit 1303 and determines whether the PMT of service_id_2 of the program A is transmitted in the currently received broadcast wave.

As a result of determination, if it is not transmitted, the control unit 1306 refers to the NIT sent from the TS decoding unit 1303, and selects a broadcast wave on which service_id_2 of the program A is transmitted. 2.

Control section 1306 recognizes the PID of the EMM included in the CAT arranged in the broadcast wave selected by second tuner section 1301-2, and receives the EMM. The control unit 1306 determines the EMM addressed to itself from among the received EMMs from the card ID information set in the non-encrypted portion of the EMM. After extracting 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) held therein, extracts and stores the work key (Kw).

The timing at which the control unit 1306 sends the EMM to the IC card 1311 is the timing shown in FIG. The control unit 1306 temporarily saves the received EMM until an appropriate timing for sending the EMM to the IC card 1311 is reached. The IC card 1311 that has received the EMM from the control unit 1306 decrypts the encrypted EMM using the master key (Km) held therein, extracts and stores the work key (Kw).

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

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

Since the program A has been reserved for recording, the partial TS including the video ES, audio ES, caption ES, etc. to be recorded is reconfigured by the control unit, encrypted with the encryption key unique to the receiver, and stored in the HDD, etc. is stored in the video recording/recording unit 1312 of .

In the case of reserved program B, similarly to program A, instead of the second tuner 1301 - 2 in the case of program A, the third tuner 1301 - 3 operates and accumulates in the recording/recording unit 1312 .

When reproducing program A or program B reserved for recording, a list of recorded programs is displayed on a user interface (not shown) shown on the screen.・After reading from the recording unit 1312 and descrambling with a key unique to the receiver to obtain the compressed video and audio signal, the video and audio decoding unit 1304 decodes the compressed signal and outputs it to a monitor or speaker (not shown). output to

When the receiver has a plurality of tuner units, the tuner units may include not only a tuner unit compatible with 2K broadcast but also a tuner unit compatible with 4K8K broadcast, that is, a tuner unit compatible with advanced wideband satellite broadcasting.

FIG. 15 is a basic configuration diagram of an advanced BS digital broadcast and advanced wideband CS digital (hereinafter referred to as 4K8K) broadcast receiver described in FIG. 5-1 of Non-Patent Document 5, Volume 5.

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

FIG. 16 is a basic configuration diagram of a receiver 1600 for descrambling broadcast waves when having three tuner units in the basic configuration of FIG.

16 differs from FIG. 15 in that the tuner section is composed of three (first tuner section 1601-1, second tuner section 1601-2, and third tuner section 1601-3); The difference is that a distributor 1613 is added to support one tuner section, and that a recording/recording section 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 section 1601-1, the second tuner section 1601-2, and the third tuner section 1601-3 are tuner sections compatible with 4K8K broadcasting. Receiver 1600 is designed to allow viewing or recording of any three channels.

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

According to Non-Patent Document 5, the update period of the scrambling key (Ks) on the transmitting side is 8000 ms, and the time until the scrambling of the broadcast signal is started using the scrambling key (Ks) included in the ECM after updating the ECM is 7600 ms. is.

Assume that the response performance of the IC card (CAS module) 1611 is, for example, an 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 entity during the grace period during which EMM processing is required for the CAS module 1611 after receiving the EMM.

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

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

In the example of FIG. 17, the first tuner unit 1601-1, which is the three tuners in FIG. Each ECM selected by the second tuner section 1601-2 and the third tuner section 1601-3 and the EMM of at least one channel can be processed.

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

In the receiver shown in FIG. 16, as a use case, a case of recording two different programs while watching a certain broadcast (so-called double recording) will be described.

When a specific channel (service_id) is selected by the user's remote control 1610 operation, the control unit 1606 acquires the TLV_stream_id of the service_id from TLV-NIT received and stored in advance, acquires the carrier frequency, 1 tuner unit 1601-1 is controlled to perform channel selection processing. Also, the control unit 1606 performs the following processing.

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

Also, 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. The control unit 1606 extracts an EMM addressed to itself based on the information in the CAS module 1611 and transmits the EMM to the CAS module 1611 .

The timing at which the control unit 1606 sends the EMM to the CAS module 1611 is the timing shown in FIG. The control unit 1606 temporarily stores the received EMMs until an appropriate timing for sending the EMMs to the CAS module 1611 is reached. The CAS module 1611 that has received the EMM from the control unit 1606 decrypts the encrypted EMM using the master key (Km) held therein, extracts and stores the work key (Kw).

In addition, using a program table (not shown) by user operation in advance, two channels scheduled to be broadcast at the same time slot, which are different from the channel selected by the first tuner unit 1601-1 and output to the monitor, are selected. Programs C and D are reserved for recording.

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

Control unit 1606 obtains the packet ID of the message containing the ECM by analyzing the MPT access control descriptor included in the broadcast wave selected by first tuner unit 1601-1, 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 encrypted ECM using the extracted work key (Kw) and extracts the scramble key (Ks).

After successfully extracting the scramble key (Ks), the CAS module 1611 transmits the scramble key (Ks) to the control unit 1606 as a normal response to the ECM reception command.

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

The descrambled assets are separated into video/audio assets by the MMT demultiplexer 1603, decoded into compressed signals by the video/audio decoder 1604, and output to a monitor or a speaker (not shown).

Scheduled recording is performed by the user on a desired program using an electronic program guide (EPG, not shown) or the like. Control unit 1606 selects second tuner unit 1601-2 at a time slightly before the start time of program C, which is scheduled to be broadcast in the same time slot as previously reserved in the program table, in accordance with the settings of the recording reservation. station to get the TLV stream. Through the same processing as the first tuner 1601-1, the assets descrambled by the descrambler 1602 are demultiplexed by the MMT demultiplexing unit 1603 to separate assets such as video, audio, subtitles, etc., and demultiplex them with the encryption key unique to the receiver. It is encrypted and stored in the recording/recording unit 1612 such as an HDD.

As with reserved program C, reserved program D is stored in picture/recording section 1612 after channel selection processing is performed by third tuner section 1601-3.

When reproducing program C or program D that has been reserved for recording, a list of recorded programs is displayed on a user interface (not shown) shown on the screen. After reading from the recording unit and descrambling with the above-mentioned receiver-specific key to obtain the compressed video and audio asset, the compressed signal is decoded by the video and audio decoding unit 1604, and the monitor and speaker (not shown) output to

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

The receiver configuration in FIG. 18 is based on the basic configuration of the receiver described in Non-Patent Document 4 Volume 5, which is the 2K broadcast operation regulation, and FIG. Based on the basic configuration of the receiver described in the fifth edition of Document 5, it is a configuration that also has the configuration of FIG. 16 with an increased number of installed tuners. It is a basic configuration example of a receiver having three.

The CAS module 1811 shown in FIG. 18 is a CAS module for 4K8K broadcasting conforming to the fifth edition of Non-Patent Document 5 as shown in Appendix 7 of Non-Patent Document 5 and It is a CAS module that integrates the functions of a conforming 2K broadcast IC card. An example in which two 4K8K broadcast tuners and three 2K broadcast tuners are simultaneously processed using one integrated CAS module will be described.

The first tuner section (4K8K) 1801-1 and the second tuner section (4K8K) 1801-2 have an IF reception band from the BS right-handed circularly polarized IF frequency to the 110CS left-handed circularly polarized wave, and are compatible with the 16APSK modulation method. is also a tuner/demodulator that supports

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 2K terrestrial digital, BS digital, and broadband CS digital broadcasting. demodulator. The first descrambler 1802-1 is compatible with the 4K8K broadcasting scrambling system AES system, and the second descrambler 1802-2 is compatible with the 2K broadcasting scrambling system MULTI2 system.

The MMT demultiplexing unit 1803-1 is compatible with the MMT/TLV multiplexing method used in 4K8K broadcasting, and the TS decoding unit 1803-2 is compatible with the MPEG-TS multiplexing method. The video/audio decoding unit 1804-1 uses H.264, which is used in 4K8K broadcasting, for video encoding. 265|HEVC, MPEG-4 AAC, MPEG-4 ALS, etc. are supported for audio coding. The video/audio decoding unit 1804-2 supports the MPEG-2 system used in 2K broadcasting for video coding and the MPEG-2 AAC system for audio coding.

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

Receiver 1800 complies with Non-Patent Document 3, Non-Patent Document 4, and Non-Patent Document 5, so after receiving an EMM addressed to itself, receiver 1800 sets the grace period until issuing a command to CAS module 1811 as 30 seconds or less. do.

In addition, as a new provision on the sending side, if a new provision is made that ``within the EMM processing grace period, one business entity will send one EMM with one card ID set every 30 seconds'', or if a new reception is made As a rule on the machine side, "After receiving an EMM addressed to the CAS ID of its own receiver, each business entity must process at least one EMM to the CAS module within 30 seconds,
If the receiver receives more EMM than specified, it may be ignored or discarded. ” is defined.

Under this operating rule, the ECM and EMM response processing time of the CAS module 1811 is, for example, 300 ms for ECM response processing for 2K broadcasting, 600 ms for ECM response processing for 4K8K broadcasting, and 2K broadcasting and 4K8K for EMM. Verification of the number of tuners that can be implemented in one CAS module and operations related to the CAS module will be described for the case where both broadcasts are 650 ms.

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

1901 is the temporal transition of the received 4K8K program. The received program 1901 is up to time T11-4, between time T11-4 and T12-4, between time T12-4 and T13-4, and between time T13-4 and T14-4, It shows that they are scrambled with different scrambling keys (Ks). 1902 is the temporal transition of ECM and EMM reception for the program 1901 . 1903 is the temporal transition of the received 2K program. The received program 1903 is up to time T11-2, between time T11-2 and T12-2, between time T12-2 and T13-2, and between time T13-2 and T14-2, It shows that they are scrambled with different scrambling keys (Ks). 1904 is the temporal transition of ECM and EMM reception for the program of 1903 .

First, the conditions under which the CAS module 1811 can process the third tuner 1801-3, the fourth tuner 1801-4, and the fifth tuner 1801-5 for 2K broadcasting are verified.

As shown in FIG. 19, as described in Non-Patent Documents 3 and 4, the update cycle of the scrambling key (Ks) in 2K broadcasting is 2 seconds, and 1600 ms before updating Ks, after updating is started to send an ECM containing the Ks of The ECM update is also 2 seconds, which is the same as the update period of Ks.

In other words, during 1600 ms when the ECM is updated and the Ks of the broadcast signal is updated, the ECM for 3 tuners is processed, and in addition, the channels selected by the 3 tuners are different within 30 seconds. , at least one EMM transmitted by the third tuner section (2K) 1801-3, the fourth tuner section (2K) 1801-4, and the fifth tuner section (2K) 1801-5 can be processed. is necessary.

Next, two tuners for 4K8K broadcasting, ie, the first tuner section (4K8K) 1801-1 and the second tuner section (4K8K) 1801-2, verify the conditions under which the CAS module 1811 can process them.

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 ECM including the updated Ks starts to be sent 7600 ms before the update of Ks. be done. The ECM update period is also 8 seconds, which is the same as the Ks update period.

That is, the processing of the first tuner section (4K8K) 1801-1 and the second tuner section (4K8K) 1801-2 can be performed during the 7600ms from when the ECM is updated until the Ks of the broadcast signal is updated. 1801-1 and the second tuner unit (4K8K) 1801-2, the first tuner unit (4K8K) for 30 seconds. ) 1801-1, and the second tuner unit (4K8K) 1801-2 must be able to process at least one EMM transmitted on each channel, that is, two.

From the above, first, the Ks update cycle of 2K broadcasting is shorter than the Ks update cycle of 4K8K, and moreover, ECM requires more immediate processing than ECM. For this reason, the order of priority is that when performing ECM processing in 2K broadcasting, three 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 It is appropriate to give priority to the process of processing the EMM in . It is verified whether processing using one CAS module 1811 is possible with the above processing priorities.

As the most severe case, five tuner sections (1st tuner section (4K8K) 1801-1, 2nd tuner section (4K8K) 1801-2, 3rd tuner section (2K) 1801-3, 4th tuner section (2K) 1801) -4, tuner unit (2K) 1801-5), the case where the update timing of each scramble key (Ks) coincides will be described as an example.

First, the ECMs of the third tuner section (2K) 1801-3, the fourth tuner section (2K) 1801-4, and the tuner section (2K) 1801-5, which are tuner sections for 2K broadcasting, are processed from the ECM update timing T21. Start. Since the ECM response processing time for 2K broadcasting in the CAS module 1811 is set to 300 ms, the third tuner section (2K) 1801-3, the fourth tuner section (2K) 1801-4, and the tuner section (2K) 1801- for 2K broadcasting 5 has a response processing time of 900 ms.

Since the ECM response time for 4K8K broadcasting is 600 ms in this example, the ECM for 4K8K can be processed in 1600-900=700 ms in the section up to time T12-2 of the update timing of the scrambling key (Ks) for 2K broadcasting. ECM processing of the first tuner unit (4K8K) is performed in this interval.

ECM response processing of the first tuner unit 1801-1 is 300ms×3+600ms=1500ms assuming that there is no processing margin in the receiver. , 500 ms, which is too short to process the ECM of 4K8K broadcast.

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

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

Next, at the ECM update timing T24 for 2K broadcasting, three 2K broadcasting tuners (third tuner section (2K) 1801-3, fourth tuner section (2K) 1801-4, tuner section (2K) 1801-5) After ECM processing, EMM processing is performed for the first tuner unit (4K8K) 1801-1, which is a 4K8K tuner. At this point, Ks update for 2K broadcasting has been performed four times, and eight seconds have passed, so the Ks update timing for 4K8K shifts to T12-4.

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

Next, after the Ks update timing T13-4 of the 4K8K broadcast, the difference from the time after the timing T12-4 is that instead of the EMM processing of the fourth tuner unit (2K) 1801-4, the fifth tuner unit (2K) 1801-5 is subjected to EMM processing. The number of 4K8K tuners installed is two in this example, and EMM processing is not required.

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

As described above, in the case of a CAS module in which CAS for 2K broadcasting and CAS for 4K8K broadcasting are integrated, even if the Ks update period for 2K broadcasting and 4K8K broadcasting are different, in addition to the ECM update period and the EMM processing grace period, By specifying the minimum number of EMMs that need to be processed per entity within the EMM processing grace period, it is possible to control the processing timing without missing any ECM or EMM processing.

Furthermore, in addition to the stipulations that the ECM update period is 2000 ms and the retransmission period is 100 ms, it is assumed that 'one EMM is transmitted to one ID per business entity in 30 seconds'.

Under this operating rule, the performance of the CAS module (IC card) is verified by verifying the number of tuners that can be installed when, for example, the ECM response processing time is 295 ms and the EMM response processing time is 400 ms.

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

Assume that the EMM process 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 during this time, up to 4 tuners can be installed. .

Since it is assumed that only one EMM is sent to each entity, that is, to one tuner in 30 seconds, the scramble key (Ks) is updated 15 times in 30 seconds (30 seconds/2 seconds). It can be verified that it is possible to process the EMMs of the 4 entities within the grace period of 30 seconds with a little more time in the response time.

In the example of FIG. 20, if the receiver processing margin is not considered at all, it is possible to process up to 4 ECMs and 2 EMMs during the 2000 ms period from T11 to T12 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, among the conditions in the above example (example 2), it is possible to transmit 8 times in 30 seconds to one ID per business entity, which is the frequency of EMM transmission. If it is specified that there is a possibility (example 3), a maximum of 32 EMMs (for 8 × 4 tuners) will be sent in 30 seconds with 4 tuners. 2 EMMs can be processed in , and up to 30 EMMs can be processed in 30 seconds. .

Therefore, even if ECM processing is possible, processing up to three tuners, that is, processing 24 EMMs in 30 seconds, is possible in terms of the EMM processing capability.

In the actual design, the design is made with consideration given to a margin such as the time for extracting the EMM and ECM from the multiplexed broadcast wave in the receiver.

The method for defining the frequency of the above EMMs is the number of EMMs sent to the CAS module (IC card) per grace period after the tuner receives EMMs addressed to the ID of the CAS module (IC card) installed in the receiver. , but the method of definition is not limited to this, and the EMM transmission frequency per card ID per business entity may be quantitatively defined.

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

Furthermore, as a regulation of the transmission frequency of EMMs, the transmission frequency when the transmission side transmits EMMs in bursts and the grace period for processing the CAS module after the reception side receives the EMMs. There is also a regulation method such that the maximum number of EMMs sent from the body to one CAS ID is 3 per 2 seconds, and 6 per 30 seconds.

In the above, the EMM for sending the contract information and work key (Kw) to the CAS module (IC card) was described, but the EMM individual message used in the automatic display message ) may have different response performance.

Therefore, the frequency of EMMs and EMM individual messages may be defined by defining the same frequency for EMMs and EMM individual messages, or by defining different frequencies for EMMs and EMM individual messages. For example, the method of specifying that "the maximum number of EMM/EMM individual messages to be sent to the same receiver is 2 in 30 seconds per broadcaster" is a case of specifying the same frequency. Note that the number "up to two" is determined in consideration of the actual performance of the CAS module, and is not limited to this value. Also, an example in which the frequencies of EMMs and EMM individual messages are defined individually will be shown.

"The maximum number of EMMs to be sent to the same receiver is 2 in 30 seconds per broadcaster, and the maximum number of EMM individual messages to be sent to the same receiver is 3 in 30 seconds per broadcaster." and EMM individual message, it is also possible to change the width of the sending time. “The maximum number of EMMs to be sent to the same receiver shall be 2 in 30 seconds per broadcaster, and the maximum number of EMM individual messages to be sent to the same receiver shall be 3 in 2 seconds per broadcaster.”
This example is the case where the EMM is defined for 30 seconds together with the update period of the transmission frequency scrambling key (Ks) of the EMM individual message.

In this way, the frequency of EMMs and/or EMM individual messages is necessary for determining the number of tuners and considering the processing margin of the control unit of the receiver in a receiver equipped with more than two tuners. It is a condition, on the other hand, regarding the frequency, the method of subscription application of the broadcaster, for example, the method of receiving it by phone as described above and sending it immediately without hanging up the phone, or by telephone or online without sending it immediately on the spot It is possible to specify according to the actual state of operation, such as when EMMs are sent out within a certain period of time (for example, within 30 minutes).

The above is an example in which the EMM (including EMM individual message) transmission frequency is stipulated in the operational regulations. is assumed. Therefore, there is also a method of defining the minimum number of EMMs to be received and processed within the grace period for the CAS module after receiving the EMMs in the operational regulations. For example, "The number of receivers that receive EMM/EMM individual messages addressed to the same receiver shall request the CAS module to process at least one per 30 seconds. The minimum number of EMMs to be processed by the receiver during the EMM processing grace period is specified, such as "EMM exceeding the limit may be discarded." , it is a method that can be discarded if it exceeds the regulation.

As explained so far, after receiving an EMM or EMM individual message addressed to itself (addressed to the card ID of the CAS module inserted in the receiver), the receiver processes the CAS module (IC card). It is easy to understand that the number of EMMs that need to be processed is stipulated during the grace period until the The transmission frequency of EMMs and EMM individual messages, or the number of EMMs that need to be processed by the receiver may be specified.

In addition, considering the demand for receivers equipped with multi-channel tuners and the demand for receivers equipped with 2K, 4K, and 8K integrated in the regulations that are already in operation, past assumptions and In order to define the transmission frequency of EMMs and EMM individual messages without contradiction, it is possible to go through the review process opposite to the above.

For example, in the implementation example of conditional access of the receiver shown in FIG. After receiving an EMM addressed to the card ID of the module), it is possible to process up to 24 EMMs during the 30-second grace period until processing for the CAS module (IC card), and from 24/4=6, By stipulating that "up to 6 EMMs will be sent per 30 seconds (EMM processing grace period) for one CAS ID per business entity", without overturning the previous tacit Can be specified. Of course, the number less than or equal to 6 may be any integer less than or equal to 6.

The figure of 6 is a tentative calculation of the performance of the CAS module, and it goes without saying that the results may vary depending on the actual performance of the CAS module. As a transmission/reception system, the EMM transmission frequency or the minimum number of EMMs to be processed within the EMM processing grace period is determined in consideration of the actual state of the CAS module performance, the ECM update cycle, and the EMM processing grace period.

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

FIG. 21A shows the receiver shown in FIG. -4, an example of a time chart for receiving ECMs and EMMs from the fifth tuner (2K) 1801-5. The receiver 1800 receives ECM and EMM at the times indicated by the arrows. After receiving EMM2121 from the second tuner (4K8K) 1801-2, ECM2110 from the first tuner (4K8K) 1801-1, ECM2120 from the second tuner (4K8K) 1801-2, and the first tuner (4K8K) 1801-1 EMM2111 from the 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 ECM2150 is received in order from -5. The horizontal axis is the time axis.

FIG. 21B shows a temporal transition in which the ECM/EMM shown in FIG. 21A is processed by the integrated CAS module of FIG. 18 for ECM and EMM. The horizontal axis is the time axis.

The ECM and EMM response processing time of the integrated CAS module 1811 in FIG. The temporal transition of ECM and EMM processing is shown for the case where both are 650 ms.

For example, 2160 represents the time the CAS module is processing EMM 2121 . 2161 represents the time the CAS module is processing the ECM 2110 . 2162 represents the time the CAS module is processing the ECM 2120 . 2163 represents the time the CAS module is processing the EMM 2111 . FIG. 2102-1 also shows that the CAS module processes EMM2121, ECM2110, ECM2120, and EMM2111 in this order.

2102-1, 2102-2, and 2102-3, when the control unit 1806 receives the EMM 2121, it confirms that there is no other high-priority buffer, and the control unit 1806 transfers the data to the integrated CAS module 1811. FIG. 10 is a diagram considering the processing of the CAS module when receiving in order of 2110, 2120, 2111, 2130, 2140, 2131, and 2150 immediately after starting processing. 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 study, in order to study under the worst conditions, in 2102-1, 2102-2, and 2102-3, the process of 2121, which is the process of 2160, is performed first.

2102-1 represents the processing order when the receiver processes the ECM and EMM at the timing of reception. In this example, the ECM 2130, which should originally complete the processing, is 1600 ms, which is the time from the timing of receiving the ECM to the timing of receiving the broadcast signal descrambled using the scrambling key (Ks) included in the ECM. , ECM 2140 and ECM 2150 have not been completed.

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

Therefore, in order to create a shared receiver described in TR-B39 Vol. becomes.

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

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

FIG. 22 is a flowchart for the receiver to request the CAS module to process the ECM and EMM in order to give top priority to the ECM process of the 2K broadcast, as described in FIG.

First, buffers for performing ECM and EMM processing will be described. When the control unit 1806 shown in FIG. 18 receives the ECM or EMM from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-2, it performs processing request transmission processing to request the CAS module 1811 to process the ECM or EMM. is started (S2200).

In order to control the order of ECM and EMM processing requests to the CAS module 1811, the control unit 1806 temporarily demultiplexes the ECM and EMM sent from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-2. Manages ECM receive buffers and EMM receive buffers to be saved. As many buffers as there are tuners are prepared, and the ECM reception buffer has a single stage buffer and the EMM reception buffer has a plurality of stages.

The ECM reception buffer is a buffer that temporarily stores ECMs included in 2K broadcasts, 4K broadcasts and 8K broadcasts. To distinguish between 2K and 4K8K, the buffer prepared for the 2K tuner is distinguished as the 2K ECM reception buffer, and the buffer prepared for the 4K8K tuner is distinguished as the 4K8K ECM buffer. The EMM reception buffer is a buffer that temporarily stores EMMs included in 2K broadcasts, 4K broadcasts, and 8K broadcasts. 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 top priority to the ECM processing of the 2K broadcast explained with reference to FIG. 22 will be explained. The control unit 1806 checks the first ECM reception buffer for 2K broadcast (S2201).

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

As a result of confirmation, if there is no data waiting for request transmission in the CAS card module 1811 in the 2K broadcast ECM reception buffer (No in S2202), the control unit 1806 next confirms the contents of the 4K8K broadcast ECM reception buffer. (S2203).

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

As a result of checking, if 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 checks the EMM reception buffer (S2205). .

If the CAS card module 1811 has data waiting for request transmission in the EMM reception buffer as a result of confirmation (Yes in S2206), the control unit 1806 issues a processing request command to the CAS module and waits for its response ( S2208). Note that the control unit 1806 extracts the data with the oldest reception time in the EMM buffer and issues a processing request command to the CAS module 1811 .

As a result of confirmation, if 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 terminates the processing request transmission processing (S2207).

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

Note that FIG. 22 shows the processing priority only for the ECM/EMM processing 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 in the CAS module within 30 seconds after receiving an EMM with a card ID addressed to one business entity. If it is received, it may be ignored or discarded." is performed.

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

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

According to this embodiment, for example, "the number of EMM/EMM individual messages addressed to the same receiver to be processed by the CAS module shall be at least 1 in 30 seconds per entity. EMM may be discarded.”

The EMM reception buffer and its processing flowchart when this provision is added will be described.

In order to implement the process of allowing EMMs exceeding 30 seconds to be discarded, the control unit 1806 shown in FIG. 18 needs to know the reception time when the EMM is received. Therefore, the control unit 1806 needs to have a storage area for storing the time when the EMM is received in the internal EMM reception buffer.

FIG. 23 is an example of an EMM reception buffer having a storage area for storing the time when an 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 the received time.

Fig. 24 shows that "The number of EMM/EMM individual messages addressed to the same receiver that should be processed by the CAS module is at least 1 in 30 seconds per entity. EMMs exceeding this in 30 seconds are discarded." It is a processing flowchart of a receiver when a provision is added.

FIG. 18 will be described as an example. When the control unit 1806 receives the EMM from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-1, it starts processing request transmission processing to request the CAS module 1811 to process the EMM (S2400).

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

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

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

If the elapsed time has passed 30 seconds as a result of confirmation (Yes in S2404), the corresponding EMM data is cleared (S2405). After clearing the data (S2405), the control unit 1806 returns to S2401 and continues the processing.

As a result of confirmation, if 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 its response (S2406). Upon receiving the response from the CAS module 1811, the control unit 1806 terminates the processing in order to confirm the priority with the ECM.

As a result of confirming the EMM reception buffer (S2401), the control unit 1806 ends the process (S2403) when there is no data waiting for request transmission in the CAS card module 1811 in the EMM reception buffer (No in S2402). ).

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

Furthermore, this embodiment has the EMM reception buffer shown in FIG. A provision could be made to determine the time of reception and to discard later received EMMs if EMMs received within 30 seconds are already present in the EMM buffer.

FIG. 25 is a processing flowchart shown in FIG. , EMM reception processing flowchart of the receiver in the case of adding a provision of "discarding EMMs received later."

Similarly, FIG. 18 will be described as an example. Upon receiving the EMM from the MMT demultiplexing section 1803-1 or the TS decoding section 1803-1, the control section 1806 starts EMM reception processing for storing the received EMM in the EMM reception buffer (S2500).

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

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

As a result of confirmation, if data of the same business entity is stored (Yes in S2501), the control unit 1806 confirms whether 30 seconds have passed since the reception time of the stored data (S2502).

If the confirmation result 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 confirmation is that it is not within 30 seconds (No in S2502), the buffer of the same business entity is cleared (S2503), the received EMM is stored in the buffer (S2504), and the process ends (S2505).

As a result of confirmation, if 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 process (S2505).

As described above, in order to consider how many tuners can be designed for a receiver with one CAS module (IC card), the ECM update cycle, ECM retransmission cycle, the installed CAS module (IC card) In addition to the response performance of EMM, by specifying the frequency of sending one ID per business entity of EMM, or the minimum number of EMMs to be processed within the processing grace period of EMM on the transmitting and receiving system, ECM, necessary EMM Strictly, it is possible to examine the number of installed tuners that can be processed by one CAS module without missing the processing of .

TR-B39 Volume 5 "4.9.3.1 Transmission frequency of EMM section and EMM individual message section" states that "In order to reduce the processing load on the receiver, EMM/EMM individual messages addressed to the same receiver are not sent intensively. A maximum of 8 EMMs or EMM individual messages are sent to the same receiver every 8 seconds. ] is stipulated. This provision is substantially applicable to all 8K, 4K, and 2K tuners equipped with EMMs addressed to the CAS module ID of the receiver, and all of them must not be simultaneously transmitted during the EMM processing grace period (e.g., 30 seconds). , 8 EMMs received in 8 seconds other than ECM processing may be possible during the EMM processing grace period (example: 30 seconds) after EMM reception, but 4K (or 8K) depends on the EMM transmission timing of the installed tuner ) Even if the tuner can receive 8 EMMs in 8 seconds, there is a possibility that they cannot be processed within 30 seconds after reception. Originally, eight EMMs should be sent every 30 seconds in order for the receiver to process the EMMs without missing anything. Do not discard even after the processing grace period (30 seconds), process at least one EMM every 30 seconds, process one cached EMM during the EMM grace period (e.g. 30 seconds), and give grace at the latest Since the purpose of the present invention can be achieved even if processing is allowed for a period of 8 (eg, 240 seconds), defining it as an exceptional case poses no problem in terms of the purpose and effect of this proposal. Therefore, it is important to determine the rules for transmission and reception in consideration of the performance of the CAS module so that the receiver can perform EMM processing without failing.

As described above, according to this 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) a tuner unit for receiving a service signal including scrambled content; a descrambler for receiving the scrambled content output from the tuner unit; a control unit for controlling at least the tuner unit and the descrambler; controlled to obtain the first key (Kw) from the first control information (EMM) using a unique third key (Km), and from the second control information (ECM) to obtain the obtained a CAS module using a 1 key (Kw) to obtain said second key (Ks) to give to said descrambler;
The control unit
It is set that the first control information (EMM) per business entity should be processed at least R (an integer of 1 or more) within the grace period for processing to the CAS module after receiving the EMM stipulated by regulations. After detecting the first control information (EMM) of the one business entity, after performing R pieces of processing within the EMM processing grace period, the next first control information (EMM) of the one business entity ) is detected, the receiving device suppresses command transmission to the card section for at least the first control information (EMM) within the EMM processing grace period.

As can be understood from the above description, the above-described embodiments naturally have functions as a receiver and features as a transmitter and a transmission/reception system. Further points in the above-described embodiments are collectively described below. (1) The maximum number of EMM/EMM individual messages sent to the same receiver is M (see *2 below) per 30 (see *1) seconds per broadcaster. (2) The maximum number of EMM/EMM individual messages sent to the same receiver is M (see *2 below) in 30 (see *1 below) seconds per broadcaster, and M2 (see below *3) seconds for 2 (see *3 below) seconds (see *2, 4 below). (3) The maximum number of EMM/EMM individual messages sent to the same receiver is M2 (see *2 and 4 below) per 2 seconds (see *3 below) per broadcaster. (4) Maximum number of EMMs to be sent to the same receiver is M (see *2 below) per 30 seconds (see *1 below) per broadcaster, and 30 individual EMM messages per broadcaster (see *1 below). ) seconds at maximum M3 (see *2, 5 below). (5) Maximum number of EMMs to be sent to the same receiver is M (see *2 below) for 30 seconds (see *1 below) per broadcaster, and 2 individual EMM messages per broadcaster (see *3 below). ) seconds at maximum M3 (see *2 and 5 below). The maximum number of EMMs sent to the same receiver is M*2 in 2 (see *3 below) seconds per broadcaster, and the maximum number of EMM individual messages is M3 (see below *1) in 30 (see *1) seconds per broadcaster. * See 2, 5). *1: 30 seconds is the grace period until processing for CAS after receiving an EMM/EMM individual message specified in the current operational regulations, *2: The number of TR-B14 and B15 is the same, TR- Another value for B39, *3 . . .
2 seconds is the ECM (Ks) update cycle for TR-B14 and TR-B15, which are operational regulations for current broadcasting (2K), 8 seconds for advanced BS/CS (4K8K) TR-B39, *4... M2 is M value is 3 or more, and if it is necessary to specify bursty transmission within one Ks update period, *5... The response time performance of CAS for EMM and EMM individual messages is actually different. . Although the use of EMM individual messages is small, this is a provision proposal that takes into account the operator's request to change the frequency of EMM.

Furthermore, various effects can be obtained as described below by the configuration of the receiver described above. Namely
(B1) A service containing at least first control information (EMM) containing an encrypted first key (Kw), second control information (ECM) containing an encrypted second key (Ks), and scrambled content a tuner section for receiving a signal; 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; Obtaining the first key (Kw) from information (EMM) using a unique third key (Km), and using the obtained first key (Kw) from the second control information (ECM) a CAS module for obtaining said second key (Ks) for providing to said descrambler;
The control unit
It is set that the first control information (EMM) per business entity should be processed at least R (an integer of 1 or more) within the grace period for processing to the CAS module after receiving the EMM stipulated by regulations. 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 (EMM) is detected, the receiving device suppresses command transmission to the card unit for the first control information (EMM) within at least the grace period.

According to the above configuration (B1), even if there is exactly one CAS module, the receiver ( or transmitter or transceiver).
(B2) In the receiver, the control unit performs the first control when the tuner unit is receiving terrestrial digital television broadcasting and when receiving BS digital broadcasting/wideband CS digital broadcasting. On the premise that the frequency with which the information (EMM) is sent is the same, or on the premise that the number of processing obligations of the first control information (EMM) is the same, the frequency or the number of The first control information (EMM) is processed with common information for determination.

According to the above configuration (B2), there is an advantage that the number of EMM frequencies (processing obligations) of TR-B14 and TR-B15 is the same. In other words, TR-B14 and TR-B15 are standard specifications for 2K TV with terrestrial digital / BS / 110CS 3-wave shared equipment, and regardless of broadcasting media (terrestrial digital, BS, 110CS), If the EMM processing frequency regulation is the same, the mounting conditions will not be complicated in the CAS processing. If the conditions are the same, it is easy to verify in the receiver development stage, and if the number of transmissions is specified, TR-B14 and B15 are of the same B-CAS system, and the EMM transmission equipment can be shared.
(B3) The control unit, when the tuner unit receives terrestrial digital television broadcasting and when receiving advanced wideband satellite digital broadcasting,
On the premise that the frequency with which the first control information (EMM) is sent within the grace period (for example, 30 seconds) is different, 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 configuration of (B3) above, TR-B14 is terrestrial digital, and pay broadcasting is possible in terms of operation regulations, but it is practically only free broadcasting, and the possibility of EMM operation is extremely low. There is a high possibility that EMMs other than TR-B39, which is required for pay broadcasting, can process more ECMs, and by setting the frequency of TR-B14 low, the number of terrestrial digital tuners installed is likely to increase.
(B4) When the tuner unit receives BS digital broadcasting/broadband CS digital broadcasting and when receiving advanced wideband satellite digital broadcasting, the control unit
On the premise that the frequency with which the first control information (EMM) is sent within the grace period (for example, 30 seconds) is different, 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 EMM and ECM command response performance in the TR-B39 compliant CAS module differs from the command response performance of the TR-B14, 15 pure IC card, the TR-B39 compliant Other EMM frequencies can be set according to the performance of the CAS module, TR-B39 can also acquire EMMs via communication channels, so frequency settings differ from TR-B14 and TR-B15, which can only transmit EMMs on broadcast waves (Reduces the noise of TR-B39), TR-B39 targets new digital broadcasting compared to 2K broadcasting such as TR-B14 and TR-B15. In order to improve the service, the number of EMMs sent in a certain period of time is increased, and EMM reception is performed as soon as possible even if an EMM is not picked up by the receiver. It is possible. Also, in TR-B39, it is possible to define the order of priority between EMM acquisition via communication channels and EMM acquisition via broadcast waves. It goes without saying that raising the processing priority of EMM via communication next to ECM is also effective in terms of user convenience.
(B5) The control unit controls when the tuner unit is receiving terrestrial digital television broadcasting, when receiving BS digital broadcasting/wideband CS digital broadcasting, and when receiving advanced broadband satellite digital broadcasting. In case, it is assumed 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. , and the first control information (EMM) is processed with common information for determining the frequency or the number.

According to the configuration of (B5) above, the processing in the receiver is simplified. The same EMM processing timing is possible regardless of the receiving network (terrestrial digital broadcasting, 2KBS, 2KCS, 4K8KBS, 4K110CS).
(B6) In the case where the tuner unit receives BS digital broadcasting/broadband CS digital broadcasting and in the first case where the tuner unit is receiving advanced wideband satellite digital broadcasting,
On the premise that the frequency with which the first control information (EMM) is sent is the same, or on the premise that the number of processing obligations of the first control information (EMM) is the same, the frequency Or processing the first control information (EMM) with the information for determining the number in common,
In the second case where the tuner unit is receiving digital terrestrial television broadcasting, the first control information ( EMM).

According to the configuration of (B6) above, the frequency at which EMMs are sent differs from TR-B14,
B15 and B39 are assumed to have the same frequency. TR-B15 and TR-B39, which include pay TV, and terrestrial digital broadcasting (divided into TR-B14), which does not actually have pay TV, have advantages similar to (B3) above. Also, by setting the frequency of the TR-B 14 to be low, there is a high possibility that the number of terrestrial digital tuners installed can be increased.
(B7) The tuner unit receives the first control information (EMM) corresponding to the one business entity and an EMM individual message that is transmitted to each receiver and indicates a pointer of an automatic display message, and receives the EMM individual message. ,
The control unit separately processes the first control information (EMM) corresponding to the one entity and the EMM individual message.

(B8) <Configuration in which the number of EMM frequencies (processing obligations) for EMM and EMM individual messages is different>
The tuner unit receives the first control information (EMM) corresponding to the one business entity and the EMM individual message that is transmitted to each receiver and indicates a pointer of an automatic display message, and the control unit receives the first control information (EMM) corresponding to the one business entity. To determine the frequency of the first control information (EMM) and the frequency of the EMM individual message on the premise that the frequencies of the first control information (EMM) and the EMM individual message corresponding to The first control information (EMM) and the EMM individual message are processed with different information.

According to the above configurations (B7) and (B8), the number of EMM frequencies (processing obligations) for EMMs and EMM individual messages is different. Therefore, it is fully assumed that the CAS module response performance of the EMM and the EMM individual message may be different, the response time is expected to be short, the size of the EMM individual message is predicted to be smaller than that of the EMM, and the response performance is assumed to be short. Therefore, it is also possible to define a higher frequency than the EMM accordingly. In addition, compared to EMM, EMM individual messages are individual parts for each ID (for example, subscriber name, etc.) of EMM mail and automatic display messages, and it is considered that the actual usage frequency is low. In other words, by setting the number of EMMs in a longer span than the EMM processing grace period or reducing the number of EMMs and ECMs even in the same processing grace period, EMM and ECM processing It is expected as an advantage that the time to turn to
(B9) The frequency of the first control information (EMM) is set according to the processing grace 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. It can be said that it is a convenient setting method. When considering the flow of the receiver, if it is determined by this period, the degree of freedom increases.
(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 period. The EMM processing grace period is currently 30 seconds, and the Ks update period is shorter. In examining the filtering performance of EMMs in a receiver, the definition of the number of EMMs in a short period of time is meaningful in terms of how many EMMs addressed to oneself can possibly arrive in a short period of time. However, this is the case when an operator issues multiple EMMs in a short period of time. Also, issuing multiple EMMs in a short period of time is effective when the receiver fails to acquire an EMM, or when it is desired to acquire an EMM as soon as possible and the same EMM is transmitted in a short period of time. However, if only the EMM transmission rate remains, the EMM cache area will increase infinitely if the setting of the processing grace period (30 seconds) remains. are valid.
(B11) <Determine the EMM frequency by the Ks update period> The frequency of the first control information (EMM) is determined by the processing grace period of the first control information (EMM) and It is set based on the update cycle of the second key (Ks).
According to the configuration (B11) above, in the configuration (B11), the EMM frequency is determined by the Ks update cycle. Even if it is enough to receive one in 30 seconds, if you want it to be received as soon as possible, for example, "The receiver needs to process at least one per business entity in 30 seconds. However, EMM transmission is Two EMMs are sent every two seconds, but after receiving an EMM, the EMM acquired in the next 30 seconds may be discarded or not received." Therefore, the remaining time can be used for EMM and ECM processing of other tuners, and by sending more EMMs in a certain period of time, it becomes possible to receive EMMs more quickly, and the viewer can confirm the contract in a shorter time. , and the receiver side can also estimate the amount of temporary EMM cache.

In addition to the above points, in this embodiment, a broadcast signal transmission system as described below. (C1)
at the receiving end,
receiving a first control information (EMM) containing at least an encrypted first key (Kw), a second control information (ECM) containing an encrypted second key (Ks) and a service signal containing scrambled content a tuner section 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 ) using a unique third key (Km) to obtain the first key (Kw), and using the obtained first key (Kw) from the second control information (ECM) to obtain the a CAS module (IC card) for acquiring said second key (Ks) for giving to a descrambler, and said transmitting facility is configured so that said first control information (EMM) per entity is sent out at a frequency equal to EMM A broadcast signal transmission system that sets a minimum number of R (an integer equal to or greater than 1) within a processing grace period (30 seconds).
(C2) In terrestrial digital television broadcasting and BS digital broadcasting/wideband CS digital broadcasting,
Assuming that each of the transmission facilities has the same frequency of transmitting the first control information (EMM), or the number of processing obligations of the first control information (EMM) is the same,
The broadcast signal transmission system according to C1, wherein the receiving side shares information for determining the frequency or the number, and can process the first control information (EMM).
(C3) Terrestrial digital television broadcasting and advanced broadband satellite digital broadcasting have different frequencies of transmission of the first control information (EMM) within the EMM processing grace period (30 seconds), or , the number of processing obligations of the first control information (EMM) is different, and the receiving side can process the first control information (EMM) with different information for determining the frequency or the number. The broadcast signal transmission system according to C1.
(C4) In terrestrial digital television broadcasting, BS digital broadcasting/broadband CS digital broadcasting, and advanced broadband satellite digital broadcasting, each of the transmission facilities transmits the first control information (EMM) within the EMM processing grace period (30 seconds). ) is sent differently, or the number of processing obligations of the first control information (EMM) is different, and information for determining the frequency or the number of the first control information (EMM) is changed on the receiving side so that the first The broadcast signal transmission system according to (C1) above, capable of processing control information (EMM).
(C5) In the BS digital broadcasting/broadband CS digital broadcasting and the advanced wideband satellite digital broadcasting, each of the transmission facilities sets the same frequency of transmitting the first control information (EMM), or the first control The above ( 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 facilities sets the frequency at which the first control information (EMM) is sent to be the same. Alternatively, the number of processing obligations of the first control information (EMM) is assumed to be the same, and information for determining the frequency or the number is shared on the receiving side to process the first control information (EMM). on the receiving side, in the second case of digital terrestrial television broadcasting, the first control information ( The broadcast signal transmission system according to (C1) above, capable of processing EMM).
(C7) The transmitting equipment transmits the first control information (EMM) corresponding to the one entity and the EMM individual message indicating a pointer of an automatic display message transmitted for each receiver, and the receiving side: The broadcast signal transmission system according to (C1) above, wherein the first control information (EMM) corresponding to the one business entity and the EMM individual message are separately processed.
(C8) The transmitting equipment transmits the first control information (EMM) corresponding to the one business entity and the EMM individual message indicating the pointer of the automatic display message transmitted for each receiver, and the receiving side transmits the On the premise that the frequencies of the first control information (EMM) and the EMM individual message corresponding to one entity are different, 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) above, wherein the first control information (EMM) and the EMM individual message can be processed with different information for determination.
(C9) The broadcast signal according to any one of C1 to C8 above, wherein the frequency of the first control information (EMM) is set according to a processing grace period of the first control information (EMM). transmission system.
(C10) Any one of C1 to C8 above, 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) 2. The broadcast signal transmission system according to claim 1.
(C11) The frequency of the first control information (EMM) depends on the processing grace period of the first control information (EMM) and the 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 above, which is set based on the above.

While several embodiments of the invention have been described, these embodiments have been presented by way of example 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 modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof. Furthermore, in each constituent element of the claims, even if the constituent element is divided and expressed, a plurality of constituent elements are expressed together, or a combination of these is expressed, it is within the scope of the present invention. Moreover, a plurality of embodiments may be combined, and examples configured by such combinations are also within the scope of the invention.

In addition, in order to make the description clearer, the drawings may schematically show the width, thickness, shape, etc. of each part compared to the actual embodiment, but this is only an example and does not apply to the present invention. It does not limit interpretation. In addition, in this specification and each figure, the same reference numerals are given to components that exhibit the same or similar functions as those described above with respect to the previous figures, and redundant detailed description may be omitted as appropriate. . In addition, 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 written, the apparatus of the present invention is applied. be. Also, 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 the same meaning.

DESCRIPTION OF SYMBOLS 100... Broadcasting station, 101... Broadcasting station server, 102... 1st security function, 103... 1st basic function, 120... Service provider apparatus, 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, 329 Speaker, tuner section 501, first tuner section 801-1, 901-1, 1301-1, second tuner section 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 part...1501, first tuner part (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 section (2K)...1801-5, descrambler...1502, 1602, first descrambler...1802-1, second descrambler...1802-2, control section... 506, 806, 906, 1306, CAS modules...1511, 1611, 18111.

Claims (1)

Receiving a first digital television broadcast including a first service signal sent by a first digital terrestrial operator, and including an encrypted first key (Kw) included in the first service signal receiving first entity's 1a control information (EMM), said first entity's 2a control information (ECM) including an encrypted 2a key (Ks) and first scrambled content; 1 tuner;
Receiving a second digital television broadcast including a second service signal sent by a second digital terrestrial broadcaster, and including an encrypted key 1b (Kw) included in the second service signal receiving 1b control information (EMM) of said second entity, 2b control information (ECM) of said second entity including an encrypted 2b key (Ks) and second scrambled content; 2 tuners and
Receiving a third digital television broadcast including a third service signal sent by a third entity of 4K8K broadcasting, and including an encrypted 1c key (Kw) included in the third service signal receiving 1c control information (EMM) of said third entity, 2c control information (ECM) of said third entity including encrypted 2c key (Ks) and third scrambled content; 3 tuners and
a descrambler that descrambles the first scrambled content, the second scrambled content and the third scrambled content output from the first tuner, the second tuner and the third tuner;
The 1a control information (EMM) of the first entity and the 2a control information (ECM) of the first entity, the 1b control information (EMM) of the second entity and the 1st a buffer for storing the 2b control information (ECM) of the second entity, the 1c control information (EMM) of the third entity and the 2c control information (ECM) of the third entity; and,
a control unit that controls the first tuner, the second tuner, the third tuner, the descrambler, and the buffer;
Controlled by the control unit, the 1a control information (EMM) of the first entity, the 1b control information (EMM) of the second entity, and the 1c control of the third entity Obtaining said 1a key (Kw), said 1b key (Kw) and said 1c key (Kw) from information (EMM) using a unique 3a key (Km), said first business entity The 1a key obtained from the 2a control information (ECM) of the, the 2b control information (ECM) of the second entity and the 2c control information (ECM) of the third entity (Kw), said key 1b (Kw), said key 1c (Kw), said key 2a (Ks), said key 2b (Ks), said key 2c for providing said descrambler; a CAS module for obtaining (Ks);
a first period within 30 seconds in which the control unit transmits a 1a-th command corresponding to the 1a-th control information (EMM) to the CAS module after receiving the 1a-th control information (EMM); , a second period within 30 seconds during which a 1b command corresponding to the 1b control information (EMM) is transmitted to the CAS module after receiving the 1b control information (EMM); and a third period within 30 seconds during which the 1c command corresponding to the 1c control information (EMM) is transmitted to the CAS module after receiving the control information (EMM) in units of business entities. and a minimum of R (an integer equal to or greater than 1) pieces of the 1a-th control information (EMM) during the first period, and a minimum of R (an integer of 1 or more) pieces of the 1b-th control information (EMM) during the second period. means for setting that R (an integer of 1 or more) should be processed and that a minimum of R (an integer of 1 or more) of the 1c-th control information (EMM) should be processed in the third period;
During the period from when the 1a-th control information (EMM) is received until the 1a-th command transmission corresponding to the 1a-th control information (EMM) is performed to the CAS module within the first period, means for transmitting a 2a command corresponding to the 2a control information (ECM) of the first entity received by the first tuner to the CAS module; and corresponding to the 1b control information (EMM). the second control information (EMM) received by the second tuner until the transmission of the 1b command to the CAS module within the second period after receiving the 1b control information (EMM). means for transmitting a 2b command corresponding to the 2b control information (ECM) of the business entity to the CAS module;
During the period from when the 1c control information (EMM) is received until the 1c command transmission corresponding to the 1c control information (EMM) is performed to the CAS module within the third period, means for transmitting a 2c command corresponding to the 2c control information (ECM) of the third entity received by the third tuner to the CAS module;
Said 1a control information (EMM) of said first entity received by said first tuner, said 1b control information (EMM) of said second entity received by said second tuner, said third tuner fetching a plurality of the 1c control information (EMM) of the third business entity received by each of the first period, the second period, and the third period within 30 seconds and storing them in the buffer; transmission of the 1a command corresponding to one of the plurality of 1a control information (EMM) captured within the 30 seconds, transmission of the 1b command corresponding to the 1b control information (EMM), and transmission of the 1c control When the 1c command transmission corresponding to the information (EMM) is performed to the CAS module, the 1a control information (EMM), the 1b control information (EMM), the 1c control information (EMM) remaining in the buffer means for discarding or suppressing control information (EMM).

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