JP2020022173A - Transmitting and receiving method - Google Patents

Abstract

To provide a transmitting and receiving method enabling a user to view a subscribed program without failing to execute processing of ECMs and EMMs necessary for descrambling.SOLUTION: A receiver 300 comprises: a tuner unit which receives service signals; a descrambler which receives scrambled content output from the tuner unit; a control unit which controls at least the tuner unit and the descrambler; and a CAS module which acquires a second key to be given to the descrambler. The control unit is set such that, after the reception of EMMs from one entity, at least R (an integer of 1 or more) of the EMMs should be processed within a processing grace period for the CAS module; and, when detecting additional EMMs after processing the R EMMs within the EMM processing grace period after the detection of the EMMs from the one entity, the control unit suspends command transmission to the CAS module with respect to at least the EMMs within the grace period.SELECTED DRAWING: Figure 3

Description

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

  Currently, in equipment that receives terrestrial digital television broadcasts, BS digital broadcasts, and broadband CS digital broadcasts, a function to record two different programs at the same time (double recording function), as well as multiple channel recording functions, etc., are broadcast at the same time. Devices capable of simultaneously recording (recording) a program to be played have been commercialized.

On the other hand, these broadcasts are scrambled on almost all channels regardless of whether they are paid broadcasts or free broadcasts. To receive and view programs, CAS (Conditional)
Access System) module (IC card) is essential.

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

  The purpose of the scramble in the pay broadcast is to establish a pay broadcast business. For this reason, at the time of shipment of the receiver, basically, all the receivers scramble the broadcast program to make it unreceivable, and only pay subscribers who have signed a contract to watch pay broadcasting can scramble the pay viewing program. By passing the key to unlock, the receiver can watch the contracted program. As a result, a pay broadcast business has been established in which a user can view a contracted program by concluding a reception contract for paying a price.

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

  The conditional access system uses a triple key system in order to allow only the subscriber to descramble the program. The triple key method uses a master key (Km) stored in a CAS module (IC card) to decrypt individual information EMM (Entitlement Management Message) sent from a broadcasting station, and then obtains 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). The scrambled content transmitted from the broadcast station is descrambled using the scramble key (Ks).

  The broadcast station frequently changes the scramble key (Ks) and sends it (the use time of the same key is about 1 second) in order to prevent unauthorized descrambling. Therefore, the broadcasting station sends an ECM having a scramble key (Ks) of the video by a broadcast wave before the video to be descrambled.

On the other hand, when BS digital broadcasting was started in December 2000, ARIB TR-B15 was specified as an operation rule that specifies actual operation parameters of the broadcast. In the 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) is set to the analog TV However, in view of the two-screen function (simultaneous viewing) that has been commercialized and the so-called back-recording function of recording another channel (CH) during viewing, the update cycle is set to about 1 second described in the standard STD-B25. On the other hand, there is described a background defined so that at least two different channels can be simultaneously viewed and back-recorded if the update cycle is set to 2 seconds or more.

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

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

  On the other hand, devices capable of simultaneously recording (recording) a plurality of programs broadcast at a certain time, such as an all-channel recording function, have been commercialized in current receivers. That is, (1) an environment in which a large number of tuners can be used simultaneously in the receiver is provided. In this case, each scramble key (Ks1 to Ksn) for a large number of tuners is required within one second or two seconds, but it is examined whether the receiver can extract the scramble key within a predetermined time. There is a need. (2) In the conditional access system, an EMM is transmitted for displaying / erasing pay broadcast contract information and an automatic display message, but there are two main purposes. One is EMM transmission for the periodic renewal of the expiration date of a paid contract, and the other is a request for a key release or automatic display message deletion immediately after a new subscriber signs up for a subscription with a business operator. In some cases, the EMM for erasure is immediately transmitted to meet the requirement. At this time, the same EMM may be repeatedly sent in the broadcast signal within one or two seconds, assuming that the receiver may miss the EMM acquisition. Since the control unit of the receiver cannot determine whether or not the content of the EMM has been updated, even under such an environment, the reception by the many tuners described in (1) within one or two seconds. It is necessary that the scramble keys (Ks1 to Ksn) are reliably obtained at the receiver for each of the scrambled video signals.

  A study to ensure that the scramble key is obtained at the receiver needs to be considered in the current rules. If the receiver fails to obtain the scramble key, some subscribers cannot view the subscribed program.

  Thus, in the present embodiment, a transmission / reception method is provided that enables viewing of a contract program without omitting ECM and EMM processes required for descrambling, even if, for example, there is exactly one CAS module. The purpose is to:

According to an embodiment, in a method for transmitting and receiving a first service signal broadcast by a first entity including at least one of terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting,
The sender is
The transmitting unit transmits the content including the video signal;
An EMM sending unit sending first control information (EMM) of the first business entity including the encrypted first key (Kw);
An ECM sending unit sending second control information (ECM) of the first business entity including an encrypted second key (Ks);
A scrambler scrambling the content with a second key (Ks);
A multiplexing unit multiplexes the scrambled content, the first control information (EMM) of the first entity and the second control information (ECM) of the first entity, and outputs a stream. To do,
Has,
The receiving side
A tuner unit that receives at least one of the terrestrial digital television broadcast, the BS digital broadcast, and the broadband CS digital broadcast including a first service signal transmitted by a first entity, and First control information (EMM) of the first entity including an encrypted first key (Kw) included in a signal, the first entity including an encrypted second key (Ks) Acquiring the second control information (ECM) and the scrambled content of the
A descrambler descrambles the scrambled content output from the tuner unit,
The control unit checks a predetermined table of the stream output from the descrambler,
Extracting the first control information (EMM) and the second control information (ECM) based on a packet ID included in the predetermined table;
Controlling the tuner section and the descrambler,
A CAS module controlled by the control unit to acquire the first key (Kw) from the first control information (EMM) of the first business entity using a unique third key (Km); Using the obtained first key (Kw) from the second control information (ECM) of the first business entity to obtain the second key (Ks) to be given to the descrambler;
A first buffer and a second buffer each hold the first control information (EMM) of the first business entity and hold the second control information (ECM) of the first business entity;
With
Further, the control unit includes:
Until the predetermined number of first commands corresponding to the first control information (EMM) of the first business entity received by the tuner unit are transmitted to the CAS module, the first command received by the tuner unit is transmitted. Sending a second command corresponding to the second control information (ECM) of the first entity to the CAS module;
After the first control information (EMM) of the first business entity received by the tuner unit is input to the first buffer, the second control information (EMM) of the first business entity is input to the second buffer. If no ECM) is input, the first command of the first entity is transmitted to the CAS module,
When the second control information (ECM) of the first business entity is input to the second buffer, the first command corresponding to the first control information (EMM) of the first business entity Before transmitting to the CAS module, transmitting a second command corresponding to the second control information (ECM) of the first business entity to the CAS module.

FIG. 1 is a diagram illustrating a configuration example of an entire system of a broadcasting station and a receiver (also referred to as a receiving device) according to an embodiment. FIG. 2 is a diagram schematically showing a main configuration of broadcast station 200. FIG. 3 is a diagram illustrating the configuration of the receiver according to the embodiment in detail. FIG. 4A is a conceptual diagram of the conditional access system described in Non-Patent Document 1. FIG. 4B shows an ECM in the case of terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting, a scramble key (Ks) included therein, and a broadcast to be descrambled using the scramble key (Ks). FIG. 3 is a diagram illustrating a temporal relationship of signals. FIG. 4C is a conceptual diagram of the conditional access system described in Non-Patent Document 2. FIG. 5 is a basic configuration diagram described in Non-Patent Document 4 when a receiver descrambles. FIG. 6 is a processing flowchart of the conditional access processing described in Non-Patent Document 1 and performed by the receiver shown in FIG. FIG. 7 is a diagram conceptually showing a process of updating the scramble key (Ks) and ECM and EMM. FIG. 8 is a basic configuration diagram of a receiver for descrambling broadcast waves when two tuners are provided, compared to the basic configuration for a receiver having one tuner shown in FIG. FIG. 9 is a basic configuration diagram of a receiver for descrambling a broadcast wave in a case of having three tuners as compared with the basic configuration of a receiver having two tuners shown in FIG. FIG. 10 is a diagram illustrating a temporal relationship between the ECM, the EMM, and the scramble key (Ks). FIG. 11 illustrates a timing at which the transmitting side described in Non-Patent Document 4 transmits an ECM including a scrambling key (Ks) and a timing at which a transmitting side transmits a video signal descrambled using the scrambling key (Ks) included in the ECM. It was done. FIG. 12 is an explanatory diagram relating to an implementation example of conditional access of a receiver in a transmission / reception system according to the transmission rule shown in FIG. FIG. 13 is a diagram showing an embodiment in which the number of tuners 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 according to an implementation example of conditional access of the receiver illustrated in FIG. FIG. 15 is a basic configuration diagram of an advanced BS digital broadcast and advanced broadband CS digital (hereinafter, 4K8K) broadcast receiver described in Non-Patent Document 5. FIG. 16 is a basic configuration diagram of another receiver when descrambling a broadcast wave when three tuner units are provided with respect to the receiver having the basic configuration of FIG. FIG. 17 is an explanatory diagram according to an implementation example of conditional access of the receiver illustrated in FIG. 16. FIG. 18 is a diagram illustrating another example of the basic configuration of a receiver having two tuner units for 4K8K reception and three tuner units for 2K reception. FIG. 19 is an explanatory diagram according to an implementation example of conditional access of the receiver illustrated in FIG. 18. FIG. 20 is an explanatory diagram according to an implementation example of conditional access of the receiver similarly to FIG. FIG. 21A shows a first tuner (4K8K) 1801-1, a second tuner (4K8K) 1801-2, a third tuner (2K) 1801-3, and a fourth tuner in the receiver shown in FIG. It is a figure which shows the example of the time chart which received ECM and EMM from (2K) 1801-4 and the 5th tuner part (2K) 1801-5. FIG. 21B is a diagram showing a temporal transition in which the ECM / EMM shown in FIG. 21A is processed by the integrated CAS module of FIG. 18 for ECM and EMM. FIG. 22 is a flowchart in which the receiver requests the CAS module to perform the ECM and EMM processing for giving the highest priority to the 2K broadcast ECM processing described in FIGS. 21A and 21B. FIG. 23 is a diagram illustrating an example of an EMM reception buffer having a storage area for storing a time when an EMM is received. FIG. 24 is a data processing flowchart of the receiver according to the embodiment that operates according to a predetermined rule. FIG. 25 is a flowchart of the process shown in FIG. 24, in which “the management time of each EMM buffer that is managed for each entity and is waiting to be processed is determined, and the EMM received within the EMM processing grace period (30 seconds) is stored in the EMM buffer. 11 is a flowchart of the process of receiving the EMM by the receiver in a case where a rule of “discarding the EMM received later when it already exists” is added.

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

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

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

  The first basic function 103 is a basic function of the broadcasting station 100. The first basic function 103 encodes (also referred to as “encode”) a video signal or an audio signal of a program to be broadcast and multiplexes the broadcast signal (the broadcast signal is a terrestrial signal). It has a function of transmitting as any broadcast wave type such as digital television broadcast, BS digital broadcast, broadband CS digital broadcast, advanced BS digital broadcast, advanced wideband CS digital broadcast, and the like. Therefore, the transmission signal includes a route via a satellite. Alternatively, the transmission signal may include a route by a cable.

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

  The broadcast station server 101 is an area in which metadata such as a program title, a program ID, a program outline, performers, broadcast date and time, and other data is stored in advance in order to transmit the metadata to a receiver by a broadcast signal.

  The first security function 102 can perform settings related to protection of content (program) included in a broadcast wave transmitted by a broadcast station.

  The service provider device (also referred to as a service provider) 120 cooperates with the broadcast station 100 to create and manage contents in a service that simultaneously provides an application function added to a program broadcast by the broadcast station 100. And provide (also called distribution). The service provider device 120 includes an application management / distribution 121 and an application server 122.

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

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

  Further, in response to a request from the receiver 140 that has received the first designated information, the service provider apparatus 120 distributes the application or content stored in the application server 122 to a communication network such as the Internet by the application management / distribution 121. To the receiver 140 via.

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

  The second basic function 141 is a basic function of the receiver, receives a broadcast wave transmitted from the broadcast station 100, and encodes a coded video signal (also referred to as a video stream) included in the broadcast wave. It has a function of separating an encoded audio signal (also referred to as 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 includes connection to peripheral devices connected to the receiver 140, for example, the display 160, an HDD (Hard Disk Drive) 162 bound to the receiver 140, and a removable medium 170, and transmission and reception of data. Also manages.

  The application management function 144 manages applications provided in the receiver 140 in advance and applications acquired via a communication network. Further, the application management function 144 controls the execution of the application 146 provided in the receiver 140 in advance or the application 146 acquired via the communication network via the API 145 which 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 apparatus 120 via the communication network.

  The display 160 has a built-in speaker 161, and displays a video signal decoded by the second basic function 141 in a display area and outputs an audio signal to the speaker 161. Note that the speaker 161 incorporated in the display 160 may be an external speaker connected via an I / F such as a 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 a main configuration of broadcast station 200 (corresponding to 100 in FIG. 1). Broadcasting station 200 generates video encoder 201, audio encoder 202, subtitle encoder 203, and ancillary data including control data such as transmission control signals, service data, and application control information for controlling application 145 operating on receiver 140. An additional data generation unit 204 is provided. In the broadcasting station 200, a broadcasting station server 211 (corresponding to 101 in FIG. 1), a first security function 212 (corresponding to 102 in FIG. 1), and a transmitting / receiving unit 213 cooperate. The video encoder 201, the audio encoder 202, the subtitle encoder 203, the attached data generation unit 204, the multiplexing unit 205, the scrambler 206, the transmitter 207, and the transmission / reception unit 213 are combined into a first basic function 210 (corresponding to 103 in FIG. 1). ).

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

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

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

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

  FIG. 3 is a diagram illustrating the configuration of the receiver 300 (corresponding to 140 in FIG. 1) according to the embodiment in detail. The receiver 300 has a second basic function 315 (corresponding to 141 in FIG. 1) which is a receiving function of 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 broadcast reception processing unit 305, a video decoder 306, an audio decoder 307, a subtitle decoder 308, an analysis unit 309, and a data broadcast engine. 310.

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

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

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

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

  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 broadcast reception processing unit 305 extracts a display signal to be displayed on the display 328 as a data broadcast from the data broadcast stream sent from the demultiplexer 304, and inputs the extracted display signal to the data broadcast engine 310. . The data broadcast engine 310 analyzes the transmitted display signal, and outputs the analyzed content to the display control unit 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 transmitted display signal.

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

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

  Although FIG. 3A illustrates the display 328 and the speaker 329 as examples incorporated in the receiver 300, for example, an external display and speaker connected by an I / F such as HDMI may be used. Good. The display control unit 327 controls the content displayed on the display 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 an analysis result to the control unit 330 as needed.

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

  Further, the receiver 300 has a control unit 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), an application 325 (146 in FIG. 1). Corresponding to).

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

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

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

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

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

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

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

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

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

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

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

  The purpose of the conditional access system is to allow only a subscriber who has acquired the right to view a program broadcasted by a specific broadcasting station to view the program broadcasted by that broadcasting station. For this reason, it is necessary that only the receiver 300 of the subscriber can extract the scramble key (Ks) 421 transmitted by the broadcast wave.

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

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

  The master key (Km) 423 is stored in a confidential state in the CAS module (IC card). The subscriber applies for a CAS module ID (card ID), which is identification information of the CAS module (IC card) 303, to the broadcast station when acquiring the right to view a program broadcast by the specific broadcast station 200. The broadcast station 200 can determine the master key (Km) 423 of the CAS module 303 of the subscriber corresponding to the applied CAS module ID (card ID) by the managing key management system (not shown). . 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 above-described key management system.

  That is, 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 application. Further, the broadcasting station 200 can set the EMM 411 to be transmitted for each subscriber by setting the information of the CAS module ID (card ID) obtained at the time of application for the subscriber in the non-encrypted portion of the EMM 411. it can.

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

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

  As described above, the broadcasting station 200 sends the ECM having the scramble key (Ks) of the video to be descrambled before the video to be descrambled.

  FIG. 4B shows an ECM in the case of terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting, a scramble key (Ks) included therein, and a broadcast to be descrambled using the scramble key (Ks). FIG. 3 is a diagram illustrating a temporal relationship of signals.

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

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

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

  The timing at which the receiver 300 receives the ECM2 is T20, which is 1600 ms earlier than T11. In this way, the receiver 300 can descramble the received broadcast signal without delay by receiving the scramble key (Ks) prior to the broadcast signal to be descrambled.

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

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

  In broadcasting, since the same signal is sent to all recipients, if the scramble key (Ks) is used for a long period of time, the scramble system itself is a public system stipulated by a ministerial ordinance. It is possible to analyze Ks by brute force or the like. If such a situation occurs, the purpose of conditional access cannot be achieved. Therefore, in current broadcasting, a scramble key (Ks) that changes with time is used. Non-Patent Document 1 defines that the usage time of the same Ks is at least about 1 second per ECM.

  Next, a basic operation when the receiver 300 descrambles will be described.

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

  The receiver 500 includes a tuner section 501 (corresponding to 301 in FIG. 3), a descrambler 502 (corresponding to 302 in FIG. 3), a TS (Transport Stream) decoding section 503 (corresponding to 304 in FIG. 3), and video / audio decoding. A display unit 505 (corresponding to 327 in FIG. 3), a control unit 506 (corresponding to 330 in FIG. 3), and a key input unit 507 (corresponding to 342 in FIG. 3). Including. The TS decoding unit 503 analyzes the transmitted descrambled broadcast signal, sequentially extracts a transmission control signal, and transmits the transmission control signal to the control unit 506. The control unit 506 can control the tuner unit 501, the descrambler 502, and the display unit 505 based on the transmission control signal sent from the TS decoding unit 503. The control unit 506 can receive a signal of an operation input 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 that can perform ECM and EMM processing based on a command given from the control unit 506 and extract a work key (Kw) and a scramble key (Ks). is there. The receiver 500 of FIG. 5 is a case where one tuner unit is mounted.

  FIG. 6 is a processing flowchart of the conditional access processing described in Non-Patent Document 1 and performed by the receiver 500 shown in FIG.

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

  If the result of the determination is that the service_id has not been transmitted (No in S603), the control unit 506 refers to the NIT (Network Information Table) transmitted from the TS decoder 503 and selects the broadcast wave on which the service_id is transmitted. Therefore, the tuner unit 501 is controlled (S610).

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

  The control unit 506 refers to the received PAT (S605), receives the PMT of the service_id to be selected (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.

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

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

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

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

  Next, a case where the receiver 300 has two tuners will be described.

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

  As described above, Non-Patent Document 1 specifies that the update cycle of the scramble key (Ks), that is, the update cycle of the ECM, is at least about 1 second.

  That is, in consideration of the maximum processing time, the CAS module (IC card) based on Non-Patent Document 1 has a CAS module having a performance capable of processing the ECM and the EMM during the update of the scramble key (Ks) for one second. (IC card).

  In order to process a plurality of channels (a plurality of tuners) with one CAS module (IC card) based on Non-Patent Document 1, a method of extending an update cycle of a scramble key (Ks) and a CAS module (IC card) Is considered to be able to process a plurality of ECMs and EMMs within the time of a 1 second scramble key (Ks) update cycle by improving the performance of the ECM.

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

"A-3-2 Update cycle,
The ECM update cycle is described in 5.8.5 ECM Update / Retransmission in this volume. The timing according to the processing capacity of the IC card is as follows: 1 ECM processing is assumed to be a maximum of 800 ms. A receiver specification is assumed on the assumption that update intervals of different ECMs are 1000 ms or more. With the revision of this document ver1.0, the update cycle was reviewed assuming the following. -The BS back program recording can be processed with one IC card while watching the BS broadcast on the TV screen.・ Similarly, simultaneous display of two screens on any BS channel is processed as one IC card. As described above, if the update interval of the ECM is 2000 ms or more, at least two scramble services for different TSs can be processed by one IC card. "
That is, since the CAS module (IC card) based on Non-Patent Document 1 can process the scramble key (Ks) update cycle of 1 second, by setting the ECM update cycle to 2 seconds, at least It is possible to process two channels (two tuners).

  In other words, by setting the ECM update cycle to 2 seconds, a CAS module (IC card) compliant with Non-Patent Document 1 allows up to two channels (two tuners) according to the operation rules regardless of its command response performance. It will be done.

  FIG. 7 is a diagram conceptually showing a process of updating the scramble key (Ks) and ECM and EMM.

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

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

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

  FIG. 8 is a basic configuration diagram of a receiver 800 for descrambling a broadcast wave in the case of having two tuners, compared to the basic configuration of a receiver having one tuner shown in FIG. It is. 8 is different from FIG. 5 in that one tuner section is added and a first tuner section 801-1 and a second tuner section 801-2 are provided. The device 813 is added, and a built-in recording / recording unit 812 is added. Others 802 to 810 and 811 are the same as 502 to 510 and 511 in FIG.

  The receiver 800 has two tuners, a first tuner 801-1 and a second tuner 801-2, so that a program selected by one tuner can be output to a monitor, and at the same time another tuner can be output. A program different from the program output to the monitor, which has been selected in the above, can be recorded and stored in the recording / recording unit 812. The recording / recording unit 812 is, for example, a built-in HDD (hard disk drive).

  Processing for selecting a broadcast wave of channel 1 to be monitored and output by the first tuner unit 801-1 and simultaneously selecting a broadcast wave of channel 2 to be recorded by the recording / recording unit 812 by the second tuner unit 801-2 Will be described.

  When channel 1 (service_id_1) to be output to the monitor is selected by the user's operation of the remote controller 810, the control unit 806 extracts in the TS decoding unit 803 whether the PMT of service_id_1 is transmitted in the currently received broadcast wave. The received PAT is received to make a determination.

  If it is determined that the transmission is not performed, the control unit 806 controls the first tuner unit 801-1 to select the broadcast wave on which the service_id_1 is transmitted with reference to the NIT transmitted from the TS decoding unit 503. I do.

  The control unit 806 recognizes the PID of the EMM included in the CAT arranged in the selected broadcast wave and receives the EMM. The control unit 806 determines the EMM addressed to itself from the received EMM from the information of the card ID set in the non-encrypted part of the EMM. When extracting the EMM addressed to itself based on the information of the card ID, 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 internal master key (Km), extracts and stores the work key (Kw).

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

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

  Upon successfully extracting 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.

  The control unit 806 that has received the scramble key (Ks) transmits the received scramble key (Ks) to the descrambler 802. The descrambler 802 sets the received scramble key (Ks) internally.

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

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

  In the reservation recording, the user makes a recording reservation of a desired program in an electronic program guide (EPG, not shown) or the like. The control unit 806 controls the second tuner unit 801-2 at the time near the start time of the program reserved for recording according to the setting content of the recording reservation, and selects the channel reserved for recording.

  The control unit 806 receives the EMM by recognizing the PID of the EMM included in the CAT arranged in the selected broadcast wave. The control unit 806 determines the EMM addressed to itself from the received EMM from the information of the card ID set in the non-encrypted part of the EMM. When extracting the EMM addressed to itself based on the information of the card ID, 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 internal master key (Km), extracts and stores the work key (Kw).

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

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

  The processing of the IC card 811 starts processing in response to a request from the receiver. Data exchange between the control unit 806 and the IC card 811 is performed in response to a request from the control unit 806 to the IC card 811. The rule is such that the control unit 806 cannot transmit the next request to the IC card 811 until a response from the IC card 811 to the control unit 806 is returned.

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

  Similarly, in the processing of the EMM, the IC card 811 includes the processing of the EMM included in the broadcast wave selected by the first tuner section 801-1 and the processing of the EMM included in the broadcast wave selected by the second tuner section 801-2. The control unit 806 adjusts the timing of requesting the processing of each EMM so as not to overlap with the timing of requesting the processing of the ECM, so that the IC card 811 Issue a command.

  At the time of processing the ECM included in the broadcast wave selected by the first tuner unit 801-1, the IC card 811 has already received the contracted EMM, and has selected the work key (Kw) from the received EMM. ) Can be decrypted to extract the scramble key (Ks) using the work key (Kw). When the IC card 811 can decrypt 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 to the control unit 811.

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

  When the recorded program stored in the recording / recording unit 821 is reproduced, the recording format stored in the recording / recording unit 821 is returned to the format decoded by the TS decoding unit 803, and the video / audio decoding is performed. The data is output to a monitor in a unit 804.

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

  When the receiver is equipped with three or more tuners, for example, when the receiver supports a so-called W reverse recording function that can simultaneously record two different channels in addition to the program being viewed, the ECM processing and the EMM processing become complicated. Become.

  When one CAS module (IC card) can handle up to two channels, it is necessary to mount two CAS modules (IC cards) in order to process three tuners reliably.

  FIG. 9 is a diagram illustrating a basic configuration of a receiver 900 for descrambling broadcast waves when three tuners are provided, compared to the basic configuration of a receiver having two tuners shown in FIG. .

  9 is different from FIG. 8 in that a third tuner unit 901-3 is added and that one IC card is added and the first and second IC cards 911-1 and 911-2 are configured. It is a point. Otherwise, 902 to 910 and 912 are the same as 802 to 810 and 812 in FIG.

  The broadcast wave of channel 1 to be monitored and 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 simultaneously selected by the second tuner unit 901-2 and simultaneously recorded. A description will be given of a process performed when a broadcast wave of channel 3 recorded by the recording unit 912 is selected by the third tuner unit 901-3.

  When channel 1 (service_id_1) to be output to the monitor is selected by the user's operation of the remote controller 810, the control unit 906 extracts in the TS decoding unit 903 whether the PMT of service_id_1 is transmitted in the currently received broadcast wave. The received PAT is received to make a determination.

  If it is determined that the transmission is not performed, the control unit 906 controls the first tuner unit 901-1 to select the broadcast wave on which the service_id_1 is transmitted with reference to the NIT transmitted from the TS decoding unit 903. I do.

  The control unit 906 receives the EMM by recognizing the PID of the EMM included in the CAT arranged in the selected broadcast wave. The control unit 906 determines the EMM addressed to itself from the received EMM from the information of the card ID set in the non-encrypted part of the EMM. When the control unit 906 extracts the EMM addressed to itself based on the information of the card ID, the control unit 906 transmits the EMM to either the first IC card 911-1 or the second IC card 911-2 determined in advance. 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 internal master key (Km) and extracts the work key (Kw). And save.

  Further, the control unit 906 receives the PMT of the service_id_1 to be selected by referring to the received PAT, 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 one of the predetermined first IC card 911-1 and 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) and extracts the scramble key (Ks).

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

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

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

  In the reservation recording, the user makes a desired program recording reservation of two different channels at the same time in an electronic program guide (EPG, not shown) or the like, and the control unit 906 performs the recording of the program according to the setting contents of the recording reservation. At the time near the start time, the second tuner unit 901-2 and the third tuner unit 901-3 are controlled to select a channel reserved for recording.

  The control unit 906 receives the EMM by recognizing the PID of the EMM because it is included in the CAT arranged in the selected broadcast wave. The control unit 906 determines the EMM addressed to itself from the received EMM from the information of the card ID set in the non-encrypted part of the EMM. When extracting 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 internal master key (Km) and extracts the work key (Kw). And save.

  Further, the control unit 906 receives the PMT of the service_id_2 to be selected by referring to the PAT, 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 the predetermined first IC card 911-1 or second IC card 911-2.

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

  For example, the first tuner unit 901-1 and the second tuner unit 901-2 are processed by the first IC card 911-1, and the third tuner unit 901-3 is processed by the second IC card 911-2. Shall be. In this case, a subscription contract is made with the card ID information of the first IC card 911-1 to acquire the right to view channels A, B, and C provided as pay broadcasting, and the card ID of the second IC card 911-2 is acquired. If you subscribe to obtain the right to watch channels D, E, and F provided as pay broadcasts with the information of, for example, if you record channels A and F simultaneously while watching channel C, 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, the contracted pay broadcast The channel can be associated with the first IC card 911-1 and the second IC card 911-2.

  However, when the third tuner unit 901-3 attempts to process the broadcast wave of channel A, the second IC card 911-2 does not contract to view the broadcast wave of channel A. In the case of 911-2, the EMM including the contract information for viewing channel A cannot be extracted, and as a result, the broadcast wave of channel A cannot be descrambled. Also, if one IC card (CAS module) has contracted for three different channels (for example, channels A, B, and C) and received EMM, one of these three channels will not be viewed at different times. Although it is possible to record, it is also conceivable to perform simultaneous processing of simultaneously recording channels B and C while watching channel A. However, as described above, as described in Non-Patent Document 4, if there is a restriction that only one IC card can simultaneously process up to two channels (tuners) of TSs, then one IC card can handle one IC. There are disadvantages such as the inability to simultaneously process TS of three different channels with the card.

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

  In the present embodiment, in a receiver equipped with a plurality of tuners for the convenience of the user, the burden of setting the linking relationship between the plurality of tuners and the plurality of IC cards by the user is reduced, and the cost is reduced. Create rules to enable processing with an IC card (CAS module).

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

  In the present embodiment, one entity newly sets one card ID in consideration of the ECM retransmission cycle and update cycle, and the command response performance described in the specifications of the CAS module (IC card). It specifies the frequency of transmitting EMMs or the number of EMMs that a receiver should process within a certain period per business entity. In other words, what is newly specified is the number of EMMs to be processed within a certain period, and is defined as the number of transmissions within a certain period as a transmission specification, or the number of EMMs processed within a certain period as a receiver specification. Means. Thus, it is possible to strictly examine how many tuners can perform simultaneous reception processing with one CAS module (IC card). Thereby, the convenience of the receiver maker is obtained.

The summary of the main points in the present embodiment can be described as follows.
(1). EMM and / or EMM individual messages sent to the same receiver (CAS module ID) per business entity in ECM retransmission cycle and update cycle in broadcasting that operates the access control method (conditional reception method or content protection method) Digital broadcast transmitting and receiving device that specifies the frequency of transmission of digital broadcasts.

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

  (2). In broadcasts using the access control method (conditional reception method or content protection method), when more than two simultaneous reception / viewing / recording / recording are performed, the ECM retransmission cycle, update cycle, and the same reception per business entity The sending frequency of the EMM and / or EMM individual message to be sent to the receiver (CAS module ID) is set, and the time from receiving the EMM and / or EMM individual message to the receiver to issuing a command to the CAS module is set. A digital broadcast receiving apparatus for controlling an EMM and / or EMM individual message processing of each of a plurality of mounted tuners during a period, from an EMM and / or EMM individual message transmission frequency to a schedule for issuing to a CAS module.

  (2b). In broadcasts using the access control method (conditional reception method or content protection method), when more than two simultaneous reception / viewing / recording / recording are performed, the ECM retransmission cycle, update cycle, and the same reception per business entity In the grace period from the reception of the EMM and / or EMM individual message sent to the device (CAS module ID) to the issuance of a command to the CAS module, the number of EMM and / or EMM individual messages that need to be processed is converted to the CAS module. Digital broadcast receiving device that controls the issuance schedule.

  (3). In a broadcast that operates an access control system (a conditional access system or a content protection system), transmission of an EMM and / or an EMM individual message transmitted to the same receiver (CAS module ID) per business entity is transmitted at a predetermined frequency. Digital broadcast transmission device that controls the transmission.

  (4). The above (1). In the description of the above, the sending frequency of the EMM and / or the EMM individual message addressed to one CAS module ID is determined by the number of EMMs to be transmitted in the grace period from the reception of the EMM to the issuance of a command to the CAS module. Broadcast transceiver.

  (5). The above (1). In the above description, a digital broadcast transmitting / receiving apparatus in which the transmission frequency of an EMM and / or EMM individual message addressed to one CAS module ID is defined by the number of EMM and / or EMM individual messages transmitted per ECM or scramble key update cycle.

  (6). The above (1). In the contents described in the above section, the transmission frequency of the EMM and / or EMM individual message addressed to one CAS ID is transmitted during the grace period from the receipt of the EMM and / or EMM individual message to the issuance of a command to be issued to the CAS module A digital broadcast transmitting / receiving apparatus defined by the number of EMM and / or EMM individual messages to be transmitted and the number of EMM and / or EMM individual messages to be transmitted per ECM or scramble key update cycle.

  (7). The above (2). In the description content of the EMM, 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 a command issued to the CAS module. And / or a digital broadcast receiver controlled by the number of EMM individual messages.

  (8). The above (2). In the description of the above, the control of the issuance schedule to the CAS module is controlled by the ECM or the scramble during the grace period from the reception of the EMM and / or the EMM individual message addressed to the CAS module to the issuance of the command to the CAS module. A digital broadcast receiving apparatus that controls the number of EMMs and / or EMM individual messages sent per key update cycle.

  (9). The above (2). Of the EMM to be transmitted to the CAS module 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 a command to the CAS module. A digital broadcast receiving apparatus controlled by the number and the number of EMMs and / or EMM individual messages sent per ECM or scramble key update cycle.

  (10). The above (3). Of the EMM / EMM individual message sent to the same receiver, the transmission frequency of the EMM and / or the EMM individual message addressed to the CAS module from the reception of the EMM and / or the EMM individual message to the issuance of a command to the CAS module. A digital broadcast transmitting apparatus that controls the number of EMMs and / or EMM individual messages to be transmitted during a grace period.

  (11). The above (3). A digital broadcast transmitting apparatus that controls the transmission frequency of an EMM and / or EMM individual message transmitted to the same receiver by the number of EMM and / or EMM individual messages transmitted per ECM or scramble key update cycle.

  (12). The above (3). In the description of the above, the sending frequency of the EMM and / or the EMM individual message to be transmitted to the same receiver is deferred from the reception of the EMM / EMM individual message addressed to the CAS module to the issuance of a command issued to the CAS module. A digital broadcast transmitting apparatus that controls the number of EMMs to be transmitted and the number of EMMs and / or EMM individual messages transmitted per ECM or scramble key update period during a period.

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

  According to the conventional standards and operation regulations, the following must be considered in order to enable simultaneous processing of two different tuners in one CAS module (IC card). Therefore, when an on-board receiver having three or more tuners is assumed, in addition to the conventional standards and operating standards, commands and commands for the on-board CAS module (IC card), such as ECM and EMM, etc. It is necessary to understand the performance required for response.

  However, even if the command response performance of the ECM or EMM of this CAS module (IC card), the sending frequency of the ECM, the update cycle, and the grace period until the EMM is received and processed are determined, how many tuner processes can be performed exactly? Detailed examination is difficult.

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

On the other hand, the EMM has an attribute that does not require immediate processing as compared with the ECM. In some cases, the EMM does not have the immediacy of the ECM, but may require processing as quickly as possible. For example, (a) a viewer A who wants to acquire a right to view a program broadcasted by a specific broadcasting station (business entity) performs a procedure related to the subscription and a trouble handling at the time of the subscription by a customer center of the subscribing broadcasting station (business entity). , And selects the channel of the broadcast station with its own receiver according to the guidance of the telephone, and notifies the card ID number of the receiver of the viewer A. (b) The viewer A keeps, for example, making a telephone call. In this state, the broadcasting station (business entity) immediately transmits the EMM in which the card ID number given by the telephone is set. (C) The receiver of the viewer A receives the EMM and can extract the scramble key (Ks). If this is the case, it becomes possible to descramble the broadcast signal of the channel (so-called unlocking becomes possible). (D) Thereby, the viewer A can confirm the completion of the contract procedure.
In the case of the above scenes (a) to (d), although the EMM processing is not as immediate as the ECM, it is a reality that the processing may need to be performed as quickly as possible.

  As described above, in the case where the viewing contract procedure is performed while the viewer checks the reception state of the receiver while the business entity and the viewer make a telephone call, a case where the receiver receives the EMM incorrectly may be assumed. Therefore, it is assumed that the broadcast station (business entity) transmits the EMM set with the same card ID in a burst for a certain period of time, assuming that the receiver misses the reception of the EMM.

  In the ECM, the receiver may control the reception of the ECM so that at least one of them is received within the period of using the same Ks in accordance with the update of the scramble key (Ks). The receiver does not control EMM reception, receives all EMMs transmitted to itself, transmits all the received EMMs to the CAS module (IC card), and requests processing. It is considered to be fundamental.

  Therefore, it is desired that the receiver processes the CAS module (IC card) with a certain period of time after receiving the EMM. For this reason, in the ARIB standard, the response performance of the CAS module (IC card) is indicated by the CAS module provider, and an EMM reception command is issued to the CAS module (IC card) after the receiver receives the EMM. A grace period before doing is specified.

  According to this rule, the problem is substantially unlikely to occur when the EMM is sent to the same CAS module (IC card) at a low frequency. However, as described above, when the key is released by telephone, It is also assumed that a plurality of EMMs are sent in a short time.

  Recently, the number of tuners installed has increased, and receivers equipped with multi-channel recording functions, as well as CAS for advanced wideband BS / CS broadcasting (so-called 4K8K broadcasting) are described in Non-patent Document 5, Part 1, Part 5, Appendix 7. It has been stipulated that the CAS of the current broadband satellite broadcast (so-called 2K broadcast) may be mounted on an integrated CAS module.

Appendix 7 states:
"Appendix 7 Shared Receiver for Current Broadcasting and Advanced BS Digital Broadcasting Reception of Advanced BS Digital Broadcasting and BS Digital Broadcasting / Broadband CS Digital Broadcasting as Specified in ARIB TR-B15 or Terrestrial Digital Television as Specified in ARIB TR-B14 The provisions for applying the same CAS module to the reception of BS digital broadcast / broadband CS digital broadcast and terrestrial digital television broadcast at the time of shared reception in which at least one of television broadcasts can be received are described below. " .

  However, a receiver that receives the current broadband satellite broadcast (so-called 2K broadcast) has a large number of tuners, or a receiver that receives advanced broadband satellite broadcast (so-called 4K8K broadcast) and current broadcast (so-called 2K broadcast). A case in which a single CAS module (IC card) receives and processes a large number of channels may well exist in the future.

  Under these circumstances, the non-patent document 5, the non-patent document 3 and the non-patent document 4 differ in the update cycle of the ECM (scramble key (Ks)), and the advanced broadband satellite broadcasting (so-called 4K8K) and the current broadcasting. If the response performance of the ECM or EMM differs between the ECM and the EMM (so-called 2K), it is necessary to study strict timing control regarding the processing of the ECM and the EMM in the receiver.

  However, it is difficult to consider timing control for ECM and EMM processing in order to obtain a receiver capable of coping with various broadcasting systems and mounting a large number of tuners only by the current regulations on EMM.

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

  In the conditional access system having the triple key structure shown in FIG. 4A, as the technical specifications on the transmission side, the ECM update cycle is set to 2000 ms and the retransmission cycle is set to 100 ms. It is assumed that the content of "send one in 30 seconds" is newly added.

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

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

  The details of the temporal relationship between the scramble key (Ks) included in the ECM and the scramble key (ks) for descrambling the broadcast signal using the included scramble key (Ks) are shown in FIG. 4B. It is on the street.

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

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

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

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

  FIG. 12 is an implementation example of conditional access of a receiver in a transmission / reception system according to the transmission rule shown in FIG. Reference numeral 1201 denotes a temporal transition of the received program. The received program 1201 is scrambled with Ks0 from 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. It indicates that.

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

  Also, when switching from another channel during the interval T22 to 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 in response from the CAS module (IC card).

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

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

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

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

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

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

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

  FIG. 13 is a diagram illustrating the basic configuration of the receiver shown in FIG. 4.1-1 in the fifth edition of Non-Patent Document 4 shown in FIG. It is a block diagram which added.

  The difference between FIG. 13 and FIG. 5 is that two tuner units are added and the tuner unit 1301-1, the second tuner unit 1301-2, and the third tuner unit 1301-3 are configured. That is, a distributor 1313 is added to correspond to each unit, and a built-in recording / recording unit 1312 is added. The rest is the same as 1302 to 1311 and 502 to 511 in FIG.

  The three tuners may be any one of terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting, or a tuner capable of selecting three waves, and view or record any three channels as a receiver specification.・ It shall be recordable.

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

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

  Reference numeral 1401 denotes a temporal transition of the received program. The received program 1401 is scrambled with Ks0 from 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. It indicates that. Reference numeral 1402 denotes a temporal transition of the received ECM.

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

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

  A case in which two different programs are recorded (so-called W back-recording) while viewing a certain broadcast in the receiver shown in FIG. 13 will be described as a use case.

  When the user selects channel 1 (service_id_1) by operating the remote controller 1310, the control unit 1306 determines whether the PMT of the service_id is transmitted in the currently received broadcast wave by the TS decoding unit 1303. To judge.

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

  The control unit 1306 recognizes the PID of the EMM from the CAT arranged on the broadcast wave selected by the first tuner unit 1301-1, and receives the EMM. The control unit 1306 determines the EMM addressed to itself from the received EMM from the information of the card ID set in the non-encrypted part of the EMM. When 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 stores 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 internal master key (Km), extracts and stores the work key (Kw).

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

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

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

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

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

  The scheduled recording is performed by the user for a desired program in an electronic program guide (EPG, not shown) or the like. The control unit 1306 controls the second tuner unit 1301-2 at the time near the start time of the program A for which recording reservation has been made, in accordance with the setting content of the recording reservation, and selects a channel for which recording reservation has been made.

  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.

  If it is determined that the broadcast signal is not transmitted, the control unit 1306 refers to the NIT sent from the TS decoding unit 1303 to select a broadcast wave on which the service_id_2 of the program A is transmitted. 2 is controlled.

  The control unit 1306 recognizes the PID of the EMM included in the CAT arranged in the broadcast wave selected by the second tuner unit 1301-2, and receives the EMM. The control unit 1306 determines the EMM addressed to itself from the received EMM from the information of the card ID set in the non-encrypted part of the EMM. When 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 internal master key (Km), extracts and stores the work key (Kw).

  The timing at which the control unit 1306 sends the EMM to the IC card 1311 is as shown in FIG. The control unit 1306 temporarily stores 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 internal master key (Km), extracts and stores the work key (Kw).

  Further, the control unit 1306 receives the PMT of the service_id_2 to be tuned by referring to the PAT of the broadcast wave of the program tuned by the second tuner unit, and recognizes the ECM PID included in the received PMT. Receive 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 reception command sets the scramble key (Ks) to 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 is reserved for recording, the partial TS including the video ES, audio ES, subtitle ES, etc. to be recorded and recorded is reconfigured by the control unit, encrypted with the encryption key unique to the receiver, and stored in the HDD or the like. Is stored in the recording / recording unit 1312.

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

  When playing the reserved program A or B, a list of recorded programs is displayed on a user interface (not shown) shown on the screen, and after selecting a program to be played, the control unit 1306 starts recording. After reading from the recording unit 1312, descrambling with a key unique to the receiver, and obtaining a video / audio signal in a compressed state, the video / audio decoding unit 1304 decodes the compressed signal, and monitors and speakers (not shown) Output to

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

  FIG. 15 is a basic configuration diagram of an advanced BS digital broadcast and an advanced wideband CS digital (hereinafter, 4K8K) broadcast receiver described in the fifth edition of FIG.

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

  FIG. 16 is a basic configuration diagram of a receiver 1600 when descrambling a broadcast wave when three tuner units are provided in the basic configuration of FIG.

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

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

  It is assumed that the CAS module used here has the response performance of ECM and EMM that can process three tuners.

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

  Assume that the response performance of the IC card (CAS module) 1611 is, for example, the response performance of the ECM is 600 ms and the response performance of the EMM is 650 ms.

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

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

  Reference numeral 1701 denotes a temporal transition of the received program. The received program 1701 is scrambled with Ks0 from 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. It indicates that. Reference numeral 1702 denotes a temporal transition of the received ECM.

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

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

  A case in which two different programs are recorded while watching a certain broadcast in the receiver shown in FIG. 16 (so-called W back-recording) will be described as a use case.

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

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

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

  The timing at which the control unit 1606 sends the EMM to the CAS module 1611 is the timing as shown in FIG. The control unit 1606 temporarily stores the received EMM until an appropriate timing for sending the EMM 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 internal master key (Km), extracts and stores the work key (Kw).

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

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

  The control unit 1606 receives the ECM by acquiring the packet ID of the message storing the ECM by analyzing the access control descriptor of the MPT included in the broadcast wave selected by the first tuner unit 1601-1. 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).

  Upon 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.

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

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

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

  In the case of the reserved program D, as in the case of the reserved program C, channel selection processing is performed by the third tuner unit 1601-3, and then stored in the recording and recording unit 1612.

  When playing the reserved program C or D, a list of recorded programs is displayed on a user interface (not shown) shown on the screen, and after selecting a program to be reproduced, the control unit starts recording / reproducing. After reading from the recording unit, descrambling with the above-mentioned key unique to the receiver, and obtaining a compressed video / audio asset, the video / audio decoding unit 1604 decodes the compressed signal, and monitors and speakers (not shown) Output to

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

  The receiver configuration of FIG. 18 is based on the basic configuration of the receiver described in the 5th edition of Non-Patent Document 4 which is a 2K broadcasting operation regulation. Literature 5 Based on the basic configuration of the receiver described in the fifth volume, the configuration has the configuration of FIG. 16 in which the number of mounted tuners is increased, and two tuners for 4K8K reception and two tuners for 2K reception It is an example of a basic structure of the receiver which has three.

  As shown in Appendix 7 of Non-Patent Document 5, the CAS module 1811 shown in FIG. 18 has a CAS module for 4K8K broadcasting conforming to Non-Patent Document 5, Volume 5 and Non-Patent Document 4, and Non-Patent Document 5, Volume 5. This is a CAS module in which the function of a compliant 2K broadcast IC card is integrated. An embodiment in the case where two 4K8K broadcast tuners and three 2K broadcast tuners are simultaneously processed using one integrated CAS module will be described.

  The first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 have an IF reception band from the IF frequency of BS right-hand circular polarization to the left-hand polarization of 110CS, and use a 16APSK modulation method. Is a corresponding tuner / demodulation unit.

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

  The MMT multiplex / demultiplex unit 1803-1 corresponds to the multiplexing method of the MMT / TLV system used for 4K8K broadcasting, and the TS decoding unit 1803-2 corresponds to the multiplexing method of the MPEG-TS system. The video / audio decoding unit 1804-1 is a video encoding system that operates in 4K8K broadcasting. 265 | HEVC and audio encoding are compatible with MPEG-4 AAC, MPEG-4 ALS, and the like. The video / audio decoding unit 1804-2 supports the MPEG-2 system used in 2K broadcasting for video encoding and the MPEG-2 AAC system for audio encoding.

  Tuning for 2K broadcasting, video / audio display and recording / recording are the same as in the embodiment of FIG. 13, and tuning, video / audio display, recording / recording for 4K8K broadcasting are the same as in the embodiment of FIG.

  In order to comply with Non-Patent Document 3, Non-Patent Document 4, and Non-Patent Document 5, the receiver 1800 has a grace period of 30 seconds or less after receiving an EMM addressed to itself and issuing a command to the CAS module 1811. I do.

Also, a new rule on the transmitting side is that a rule that “one business entity transmits one EMM with one card ID within one 30 seconds within one EMM processing grace period” or a new reception is performed. As a rule of the machine side, "After receiving the EMM addressed to the CAS ID of the own receiver per entity, at least one EMM must be processed for the CAS module within 30 seconds,
If the receiver receives an EMM exceeding the specified value, it may be ignored or discarded. ".

  Under this operation rule, the response processing time of the ECM and EMM of the CAS module 1811 is, for example, 300 ms for the response processing time of the ECM for 2K broadcasting, 600 ms for the response processing time of the ECM for 4K8K broadcasting, and 2K broadcasting and 4K8K for EMM. Verification of the number of tuners that can be implemented by one CAS module and operation 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 a temporal transition of the received 4K8K program. The received program 1901 is transmitted until time T11-4, between times T11-4 and T12-4, between times T12-4 and T13-4, and between times T13-4 and T14-4. Different scramble keys (Ks) indicate that they are scrambled. Reference numeral 1902 denotes a temporal transition of reception of the ECM and EMM for the 1901 program. Reference numeral 1903 denotes a temporal transition of the received 2K program. The received program 1903 is transmitted between 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. Different scramble keys (Ks) indicate that they are scrambled. Reference numeral 1904 denotes a temporal transition of reception of the ECM and EMM for the program of 1903.

  First, the conditions that the third tuner 1801-3, the fourth tuner 1801-4, and the fifth tuner 1801-5 of the 2K broadcast can be processed by the CAS module 1811 are verified.

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

  That is, the ECM is updated and the Ks of the broadcast signal is updated in 1600 ms, the ECM processing for three tuners is performed, and in addition, the channels selected by the three tuners within 30 seconds are different entities. In the case of, it is possible to process at least one EMM transmitted by the third tuner (2K) 1801-3, the fourth tuner (2K) 1801-4, and the fifth tuner (2K) 1801-5. is necessary.

  Next, the conditions that the two tuners of the 4K8K broadcast, that is, the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 can process in the CAS module 1811 are verified.

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

  That is, the processing of the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 can be performed during 7600 ms until the ECM is updated and the Ks of the broadcast signal is updated. Similarly to the case, in the case where the channel selected by the first tuner unit (4K8K) 1801-1 and the channel selected by the second tuner unit (4K8K) 1801-2 are different entities, the first tuner unit (4K8K) for 30 seconds. ) 1801-1, it is necessary that at least one EMM transmitted on the channel selected by the second tuner unit (4K8K) 1801-2, that is, two EMMs can be processed.

  From the above, first, the Ks update cycle of the 2K broadcast is shorter than the Ks update cycle of 4K8K, and the ECM and the EMM require the ECM to perform an immediate process. For this reason, as a priority, when performing ECM processing in 2K broadcasting, three tuners are performed within 1600 ms after each update of ECM, then ECM processing in 4K8K broadcasting is performed, and then 2K broadcasting or 4K8K broadcasting is performed. It is appropriate to give priority to the process of performing EMM in. It is verified whether processing using one CAS module 1811 is possible with the above processing priorities.

  As the most severe cases, there are five tuner units (a first tuner unit (4K8K) 1801-1, a second tuner unit (4K8K) 1801-2, a third tuner unit (2K) 1801-3, and a fourth tuner unit (2K) 1801). -4, In the program received by the tuner unit (2K) 1801-5), an example will be described in which the update timing of each scramble key (Ks) matches.

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

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

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

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

  Similarly, three 2K broadcast tuners (a third tuner (2K) 1801-3, a fourth tuner (2K) 1801-4, and a tuner (2K) 1801-5) from the ECM update cycle T23 of the next 2K broadcast. ECM processing is performed. The ECM processing of the two 4K8K tuners (the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2) has already been completed, and the Ks update timing T12-4 of the 4K8K broadcast is completed. Since there is still room, three 2K broadcast tuners (third tuner section (2K) 1801-3, fourth tuner section (2K) 1801-4, and tuner section (2K) 1801 from the 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 of the 2K broadcast, the three 2K broadcast tuners (the third tuner (2K) 1801-3, the fourth tuner (2K) 1801-4, and the tuner (2K) 1801-5) are set. After the ECM processing, the first tuner unit (4K8K) 1801-1, which is a 4K8K tuner, performs EMM processing. At this time, the Ks update of the 2K broadcast is performed four times and eight seconds have elapsed, so that the process shifts to the 4K8K Ks update timing T12-4.

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

  Next, after the Ks update timing T13-4 of the 4K8K broadcast, the fifth tuner unit (2K) 1801-5 instead of the EMM process of the fourth tuner unit (2K) 1801-4 is different from the timing T12-4 and thereafter. EMM processing is performed. In this example, the number of mounted 4K8K tuners is two, and there is no need for EMM processing.

  By controlling the order of the processing as described above, the first tuner unit (4K8K) can update the scramble key (Ks) update timing T11-4, T12-4, and T13-4 of 4K8K broadcast for 8 seconds × 3 = 24 seconds. 1801-1, the second tuner (4K8K) 1801-2, the third tuner (2K) 1801-3, the fourth tuner (2K) 1801-4, and the fifth tuner (2K) 1801-5 have EMMs. At least one unit is capable of performing processing, and the third tuner unit (2K) 1801-3 and the fourth tuner unit (2K) 1801-4 for every 1600 ms from the 2K ECM update timing to the next Ks update timing. , The ECM processing of the fifth tuner unit (2K) 1801-5 is performed, and 76 minutes from the ECM update timing of the 4K8K broadcast to the scramble key (Ks) update. The first tuner portion until 0ms (4K8K) and the second tuner section ECM process (4K8K) was possible.

  As described above, when the CAS for 2K broadcast and the CAS for 4K8K broadcast are an integrated CAS module, even if the Ks update cycle of the 2K broadcast and the 4K8K broadcast are different, in addition to the ECM update cycle and the EMM processing grace period, By specifying the minimum number of EMMs that need to be processed per business entity within the EMM processing grace period, processing timing control can be performed without missing any ECM or EMM processing.

  Further, it is assumed that, in addition to the provisions that the ECM update cycle is 2000 ms and the retransmission cycle is 100 ms, a provision is made that “one EMM is transmitted for one ID per one business entity in 30 seconds”.

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

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

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

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

  In the example of FIG. 20, if the margin of the receiver processing is not considered at all, it is possible to process up to four ECMs and two EMMs during the period 2000 ms from the period T11 using the scramble key Ks to T12. In 30 seconds, up to 30 EMM processes are possible.

  However, under conditions different from the above operation, for example, among the conditions in the above example (Example 2), it is possible to transmit eight times in 30 seconds to one ID per one entity which is the transmission frequency of EMM. (Example 3) When 4 tuners send up to 32 EMMs (for 8 × 4 tuners) within 30 seconds, the Ks update cycle per 2000 ms Can process two EMMs, and can process up to 30 EMMs in 30 seconds, but cannot process two EMMs because up to 32 EMMs can be sent .

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

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

  The method of defining the frequency of the EMM is that the tuner receives the EMM addressed to the ID of the CAS module (IC card) mounted on the receiver and then transmits the EMM to the CAS module (IC card) per grace period. However, the method of definition is not limited to this, and the transmission frequency of the EMM per card ID per business entity may be quantitatively defined.

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

  Further, as a rule for the transmission frequency of the EMM, a rule based on a combination of a transmission frequency when the transmitting side transmits the EMM in a burst and a grace period for gracefully processing the CAS module after the receiving side receives the EMM, for example, one business There is also a prescribed method such that a maximum of three EMMs are transmitted from the body to one CAS ID every two seconds and a maximum of six EMMs per 30 seconds.

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

  Therefore, the method of defining the frequency of the EMM and the EMM individual message may be a method of defining the EMM and the EMM individual message at the same frequency, or a method of defining the EMM and the EMM individual message at different frequencies. For example, the definition method of “the maximum number of EMM / EMM individual messages to be transmitted to the same receiver is two per 30 seconds per business entity” is a case where the same frequency is specified. Note that the number of “maximum two” is not limited to this value as it is determined in consideration of the performance of the actual CAS module. An example in which the frequency of the EMM and the frequency of the EMM individual message are individually defined will be described.

"The maximum number of EMMs to be transmitted to the same receiver is 2 per 30 seconds per business entity, and the maximum number of EMM individual messages to be transmitted to the same receiver is 3 per 30 seconds" or EMM. And the EMM individual message can be changed according to the width of the transmission time. "The maximum number of EMMs to be transmitted to the same receiver is 2 per 30 seconds per business entity, and the maximum number of EMM individual messages to be transmitted to the same receiver is 2 per second for 3 seconds."
This example is a case where the EMM is specified for 30 seconds together with the update cycle of the transmission frequency scramble key (Ks) of the EMM individual message.

  As described above, the frequency of the EMM and / or the EMM individual message is necessary for determining the number of tuners and examining the processing margin of the control unit of the receiver in a receiver equipped with more than two tuners. On the other hand, regarding the frequency, regarding the frequency, the method of applying for the broadcaster's subscription, such as accepting by telephone as described above and sending immediately without hanging up, or by telephone or online without sending immediately For example, when the EMM is transmitted within a certain period of time (for example, within 30 minutes), it is possible to define the EMM according to the actual situation of operation.

  The above is an example in which the transmission frequency of the EMM (including the EMM individual message) is specified in the operation rule. However, assuming that the EMM is missed in the receiver, even when the same EMM is retransmitted in a short time, it is also used as an actual operation. Is assumed. Therefore, in the operation rules, there is a method of specifying the minimum number of EMMs to be received and processed within a grace period for the CAS module after receiving the EMM. For example, "a receiver that receives an EMM / EMM individual message addressed to the same receiver should request the CAS module to process at least one in 30 seconds per business entity. For example, the minimum number of EMMs to be processed by the receiver in the EMM processing grace period is specified, and the EMM addressed to the receiver (CAS ID) received within the processing grace period is set to " In this method, the data exceeding the specified rule may be discarded.

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

  In addition, considering the demand for receivers equipped with multi-channel tuners and the demand for receivers equipped with 2K, 4K, and 8K integrated into the regulations already in use, it is necessary to consider past assumptions in order to enable strict receiver design. In order to specify the transmission frequency of the EMM and the EMM individual message without contradiction, it is possible to go through the above-described reverse examination process.

  For example, in the implementation example of the conditional access of the receiver shown in FIG. 20, if it is implicitly understood that four tuners can be installed, the receiver is addressed to itself (the CAS inserted in the receiver). After receiving the EMM for the module card ID), the CAS module (IC card) can process up to 24 EMM processes within a grace period of 30 seconds before processing. By stipulating that the maximum number of EMMs to be transmitted per 30 seconds (grace period of EMM processing) per CAS ID per business entity is 6 at maximum, the previous implied matters will not be overturned. Standardization is possible. Of course, the number of 6 or less may be any number as long as it is an integer of 6 or less.

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

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

  FIG. 21A shows a first tuner (4K8K) 1801-1, a second tuner (4K8K) 1801-2, a third tuner (2K) 1801-3, and a fourth tuner (2K) 1801 in the receiver shown in FIG. 4 shows an example of a time chart when ECM and EMM are received from the fifth tuner (2K) 1801-5. The receiver 1800 receives the ECM and the EMM at the times indicated by the arrows, respectively. After receiving the EMM 2121 from the second tuner (4K8K) 1801-2, the ECM 2110 from the first tuner (4K8K) 1801-1, the ECM 2120 from the second tuner (4K8K) 1801-2, and the first tuner (4K8K) 1801-1. EMM2111, ECM2130 from third tuner (2K) 1801-3, ECM2140 from fourth tuner (2K) 1801-4, EMM2131 from third tuner (2K) 1801-3, and fifth tuner (2K) 1801 This indicates that ECMs 2150 are received sequentially from -5. The horizontal axis is the time axis.

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

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

  For example, 2160 indicates the time during which the CAS module is processing the EMM 2121. Reference numeral 2161 denotes a time during which the CAS module processes the ECM 2110. Reference numeral 2162 denotes a time during which the CAS module processes the ECM 2120. Reference numeral 2163 denotes a time during which the CAS module is processing the EMM2111. FIG. 2102-1 illustrates that the CAS module performs processing in the order of EMM2121, ECM2110, ECM2120, and EMM2111.

  FIG. 2102-1, FIG. 2102-2, and FIG. 2102-3 confirm that when the control unit 1806 receives the EMM 2121, there is no other high-priority buffer, and the control unit 1806 sends the integrated CAS module 1811 to the integrated CAS module 1811. FIG. 13 is a diagram in which the processing of the CAS module when the processing is received in the order of 2110, 2120, 2111, 2130, 2140, 2131, and 2150 immediately after starting the processing is considered. In addition, 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 condition, in 2102-1, 2102-2, and 2102-3, the process of 2160 which is the process of 2121 is performed first.

  Reference numeral 2102-1 denotes a processing order in the case where the receiver processes the ECM and the EMM when receiving the timing. In this example, the ECM 2130, which must originally complete the processing, in 1600 ms, which is the time from the reception timing of the ECM to the timing of receiving the broadcast signal descrambled using the scramble key (Ks) included in the ECM , ECM2140, and ECM2150 have not been completed.

Therefore, regarding the “4.1 (8) EMM reception command and EMM individual message reception command” described in Non-Patent Document 4, after receiving the EMM and the EMM individual message addressed to the own card, the receiver receives the IC within 30 seconds. Issuing a command to be performed on the card. (There is a related description in main volume A-10.) "
2102-2 is an example in which the ECM processing and the processing of the EMM individual message are delayed by prioritizing the processing of the ECM according to the above. As in this example, the priority of the ECM processing is increased so that the 2K ECM processing is completed within 2000 ms, which is the update cycle of the 2K ECM. However, the total processing time of EMM2121 to ECM2150 is the processing time of EMM2121 (650 ms) + the processing time of ECM2110 (600 ms) +
The processing time of the ECM 2120 (600 ms) + the processing time of the ECM 2130 (300 ms) + the processing time of the ECM 2140 (300 ms) + the processing time of the ECM 2150 (300 ms) = 2750 ms. Is not completed within 2000 ms.

  Therefore, in order to create a shared receiver described in TR-B39, Vol. 5, Appendix 7, “Common Receivers for Current Broadcasting and Advanced BS Digital Broadcasting,” it is necessary to further devise the processing order of ECM and EMM. Becomes

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

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

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

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

  The control unit 1806 temporarily sends the ECM and EMM sent from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-2 to the CAS module 1811 for order control of the ECM and EMM processing requests. It manages the ECM reception buffer to be saved and the EMM reception buffer. As many buffers as the number of tuners are provided, the ECM reception buffer has a single-stage buffer, and the EMM reception buffer has a plurality of stages of buffers.

  The ECM receiving buffer is a buffer for temporarily storing the ECM included in the 2K broadcast, the 4K broadcast, and the 8K broadcast. The buffer prepared for the 2K tuner is distinguished from the 2K ECM receiving buffer, and the buffer prepared for the 4K8K tuner is distinguished from the 4K8K ECM buffer so that the 2K tuner can be distinguished from the 4K8K tuner. The EMM reception buffer is a buffer for temporarily storing the EMM included in the 2K broadcast, the 4K broadcast, and the 8K broadcast. The data in each buffer is deleted when a response to the processing request from the control unit 1806 to the CAS module 1811 is returned.

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

  As a result of the confirmation, if there is data waiting to be transmitted 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, Wait for a response (S2208).

  If the CAS card module 1811 has no data waiting for request transmission in the 2K broadcast ECM reception buffer as a result of the check (No in S2202), the control unit 1806 checks the 4K8K broadcast ECM reception buffer next. (S2203).

  As a result of the confirmation, if there is data waiting for request transmission in 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 responds. Wait (S2208).

  If the CAS card module 1811 has no data waiting for request transmission in the 4K8K broadcast ECM reception buffer (No in S2204), the control unit 1806 checks the EMM reception buffer next (S2205). .

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

  As a result of the check, 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 ends the processing request transmission process (S2207).

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

  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, "After receiving the EMM in which the card ID addressed to itself per business entity is set, at least one EMM must be processed for the CAS module in 30 seconds. An example in which the processing according to the rule that "if received, may be ignored or discarded."

  Non-Patent Document 4 describes the EMM processing grace period of a receiver. For an EMM reception command and an EMM individual message reception command, after receiving an EMM and an EMM individual message addressed to its own card, the receiver receives an IC message within 30 seconds. Issue commands to be issued to the card. (There is a related description in the main part A-10.)

  Non-patent document 5 also describes the EMM processing grace period of the receiver. For the EMM reception command and the EMM individual message reception command, the EMM reception command and the EMM individual message are received within 30 seconds after receiving the EMM and the EMM individual message addressed to the own card. Command is issued from the machine to the CAS module. (There is a related description in Appendix 4.)

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

  An EMM receiving buffer and a processing flowchart thereof when this rule is added will be described.

  In order to realize the process that the EMM exceeding 30 seconds may be discarded, the control unit 1806 shown in FIG. 18 needs to know the reception time at which the EMM was received. Therefore, the control unit 1806 needs to have a storage area for storing the time at which the EMM was received, in an internal EMM reception buffer.

  FIG. 23 is an example of an EMM reception buffer having a storage area for storing the time at which the EMM was received. (A) is an example of a reception buffer having no storage area for storing the reception time. (B) is an example of a reception buffer having a reception time storage area 3201.

  FIG. 24 shows that “the number of EMM / EMM individual messages addressed to the same receiver to be processed by the CAS module is at least one in 30 seconds per business entity. EMMs exceeding this in 30 seconds are discarded”. It is a processing flowchart of a receiver when a regulation is added.

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

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

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

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

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

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

  If the control unit 1806 checks the EMM reception buffer (S2401) and finds that the CAS card module 1811 has no data waiting to transmit a request (No in S2402), the process ends (S2403). ).

  Note that since the EMM process has low immediacy, the start of the process in FIG. 24 may be controlled by, for example, the control unit 1806 by polling or the like.

  Further, the present embodiment has the EMM reception buffer shown in FIG. 23, and when controlling the processing request of the EMM in the processing flowchart as shown in FIG. It is also conceivable to determine the reception time, and discard the EMM received later if the EMM received within 30 seconds already exists in the EMM buffer.

  FIG. 25 is a flowchart of the process shown in FIG. 24, in which “the management time is determined for each business entity, the reception time of the buffer of the EMM waiting to be processed is determined, and the EMM received within 30 seconds already exists in the EMM buffer. 14 is a flowchart of a process of receiving the EMM by the receiver in a case where a rule of “discarding the EMM received later” is added.

  Similarly, FIG. 18 will be described as an example. When receiving the EMM from the MMT demultiplexing unit 1803-1 or the TS decoding unit 1803-1, the control unit 1806 starts an EMM reception process 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 business entity.

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

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

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

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

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

  As described above, in order to determine how many tuners can be designed with one CAS module (IC card), the ECM update cycle, the ECM retransmission cycle, the installed CAS module (IC card) In addition to the response performance of the EMM, the ECM and required EMM can be specified by specifying the frequency of transmission per ID per EMM entity or the minimum number of EMMs to be processed within the EMM processing grace period on the transmission / reception system. It is possible to study the number of mounted tuners that can be strictly processed by one CAS module, without omitting the processing of (1).

  In TR-B39 Vol. 5 “4.9.3.1 Transmission frequency of EMM section and EMM individual message section”, “EMM / EMM individual messages addressed to the same receiver are not sent concentratedly to reduce the processing load on the receiver. Considering this, the maximum number of EMMs or EMM individual messages sent to the same receiver is 8 per 8 seconds. ] Has been stipulated. This rule is effective if all the 8K, 4K and 2K tuners equipped with the EMM addressed to the CAS module ID of the receiver are not transmitted simultaneously during the EMM processing grace period (eg 30 seconds). After EMM reception of eight EMMs received in 8 seconds other than ECM processing, there may be a case where the EMM processing grace period (eg, 30 seconds) is possible, but depending on the EMM transmission timing of the onboard tuner, 4K (or 8K) ) In the tuner, even if eight EMMs can be received in 8 seconds, there is a possibility that the processing cannot be completed in 30 seconds after reception. Originally, eight EMMs should be sent every 30 seconds in order to perform EMM processing without being missed by the receiver. However, if the broadcaster allows, eight EMMs received in eight seconds are EMMs. Even if the processing grace period (30 seconds) has passed, one EMM process is performed at least every 30 seconds without being discarded, and eight cached EMMs are processed one during the EMM grace period (eg, 30 seconds). Since the object of the present invention can be achieved even if the processing is allowed during the period × 8 (eg, 240 seconds), there is no problem in the purpose and effect of the present invention to be defined as an exception case. It is important to determine the rules that can be transmitted and received, taking into account the performance of the CAS module so that the receiver can perform the EMM process without dropping.

As described above, according to the present embodiment, the first control information (EMM) including at least the encrypted first key (Kw) and the second control information (ECM) including the encrypted second key (Ks) And, a tuner unit that receives a service signal including scrambled content, a descrambler that receives the scrambled content output from the tuner unit, at least the tuner unit, a control unit that controls the descrambler, and the control unit Is controlled, the first key (Kw) is obtained from the first control information (EMM) using a unique third key (Km), and the second key obtained from the second control information (ECM) is obtained. A CAS module for obtaining the second key (Ks) to be given to the descrambler using one key (Kw);
The control unit includes:
The first control information (EMM) per business entity is set so that a minimum of R (integer of 1 or more) should be processed within a processing grace period for the CAS module after receiving the EMM specified in the regulation. After detecting the first control information (EMM) of the one business entity and performing R processes within the EMM processing grace period, the first control information (EMM) next to the one business entity ) Is detected, a receiving device is provided that suppresses sending of a command to the card unit for at least the first control information (EMM) within the EMM processing grace period.

  As can be understood from the above description, the above-described embodiment has, of course, a function as a receiver and features as a transmitter and a transmission / reception system. Hereinafter, further points in the above-described embodiment will be collectively described. (1) The maximum number of EMM / EMM individual messages to be sent to the same receiver is 30 (see * 1) seconds per business entity (see * 2 below). (2) The maximum number of EMM / EMM individual messages to be sent to the same receiver is 30 (see * 1 below) for M seconds (see * 2 below), and M2 (see below * 3) seconds per business entity. (See * 2, 4 below)). (3) The maximum number of EMM / EMM individual messages to be transmitted to the same receiver is M2 (see * 2, 4) in 2 seconds (see * 3) per business entity. (4) The maximum number of EMMs to be transmitted to the same receiver is 30 (see * 1) for 30 seconds per entity (see * 2), and the number of EMM individual messages is 30 per entity (see * 1 below). ) For a maximum of M3 (see * 2, 5 below). (5) The maximum number of EMMs to be sent to the same receiver is 30 (see * 1 described later) per business entity for 30 seconds (see * 2 below), and the number of EMM individual messages is 2 per entity (see * 3 described below). ) The maximum is M3 per second (see * 2, 5 below). The maximum number of EMMs to be sent to the same receiver is M * 2 for 2 seconds per entity (see * 3 below), and the maximum number of EMM individual messages is M3 for 30 seconds (see * 1 below) per entity (see below). * 2, 5). * 1 ... 30 seconds is the grace period until the CAS is processed after receiving the EMM / EMM individual message specified in the current operation regulations. * 2 ... The number of TR-B14 and B15 is the same, TR- In B39, another value, * 3... 2 seconds is the operation regulation TR-B14 in the current broadcast (2K), the ECM (Ks) update cycle in TR-B15, and the advanced BS / CS (4K8K) TR-B39. 8 seconds, * 4... M2 is a case where the value of M is three or more, etc., and when it is necessary to specify the case of sending in bursts within one Ks update cycle, * 5... EMM and EMM The CAS response time performance of individual messages is actually different. EMM individual messages are rarely used, but they are regulations that take into account the demands of businesses that want to change the frequency from EMM.

Further, various effects can be obtained by the above-described configuration of the receiver as described below. That is, (B1)
Receives first control information (EMM) including at least an encrypted first key (Kw), second control information (ECM) including an encrypted second key (Ks), and a service signal including scrambled content A tuner section, a descrambler for receiving the scrambled content output from the tuner section, a control section for controlling at least the tuner section, the descrambler, and the first control information (EMM) controlled by the control section. ), The first key (Kw) is obtained using a unique third key (Km), and the first key (Kw) obtained from the second control information (ECM) is used. A CAS module for obtaining the second key (Ks) to be given to the descrambler;
The control unit includes:
The first control information (EMM) per business entity is set so that a minimum of R (integer of 1 or more) should be processed within a processing grace period for the CAS module after receiving the EMM specified in the regulation. After detecting the first control information (EMM) of the one business entity and performing R processes within the grace period of the EMM process, the first control information (EMM) next to the one business entity A receiving device that, when detecting (EMM), suppresses sending a command to the card unit for at least the first control information (EMM) within the grace period.

According to the configuration of the above (B1), even if there is exactly one CAS module, the receiver () can view the contracted program without omitting ECM and EMM processes required for descrambling. Or a transmitting device or a transceiver). (B2)
In the receiver, the control unit is configured to control the first control information (EMM) when the tuner unit is receiving terrestrial digital television broadcast and when the tuner unit is receiving BS digital broadcast / broadband CS digital broadcast. ) Is sent, or the number of processing obligations of the first control information (EMM) is assumed to be the same, and the frequency or the number is determined. The first control information (EMM) is processed using the same information.

According to the configuration (B2), there is an advantage that the number of EMM frequencies (processing obligations) of the TR-B14 and the TR-B15 is the same. In other words, TR-B14 and TR-B15 are standard specifications of 3K terrestrial digital / BS / 110CS three-wave duplexer for 2K TV, regardless of broadcast media (terrestrial digital, BS, 110CS). The same EMM processing frequency regulation does not complicate mounting conditions in CAS processing. Under the same conditions, if the verification is easy and the number of transmissions is specified in the receiver development stage, TR-B14 and TR15 are the same B-CAS system, and the EMM transmission equipment can be shared. (B3)
The control unit is configured so that, when the tuner unit is receiving terrestrial digital television broadcasting and when receiving advanced broadband satellite digital broadcasting,
It is assumed that the frequency of the first control information (EMM) is different within the grace period (for example, 30 seconds) or that the number of processing obligations of the first control information (EMM) is different. It is assumed that 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 allows for pay broadcasting under the operation regulations, but is substantially only free broadcasting and the possibility of operating EMM is extremely low. An EMM different from the TR-B39, which requires pay broadcasting, is likely to be able to process more ECMs, and by setting the frequency of the TR-B14 low, the number of terrestrial digital tuners installed Is likely to increase. (B4)
The control unit may determine whether the tuner unit is receiving BS digital broadcast / broadband CS digital broadcast or advanced tuple satellite digital broadcast.
It is assumed that the frequency of the first control information (EMM) is different within the grace period (for example, 30 seconds) or that the number of processing obligations of the first control information (EMM) is different. It is assumed that the first control information (EMM) is processed with different information for determining the frequency or the number.

According to the above configuration (B4), even if the command response performance of the EMM and ECM in the CAS module conforming to TR-B39 is different from the command response performance of the IC card based on TR-B14, TR-B39. Other EMM frequency can be set according to the performance of the CAS module. Since the TR-B39 can acquire EMM via a communication channel, the frequency setting is different from that of TR-B14 and TR-B15 that can only perform EMM transmission of broadcast waves only. Is possible (reduces the number of TR-B39s). Compared to 2K broadcasts such as TR-B14 and TR-B15, TR-B39 is intended for new 4K8K pay-broadcast subscribers because it targets later digital broadcasts. In order to improve the service, the number of EMMs sent for a certain period of time is increased, and even if EMMs are missed at the receiver, By performing the M reception it is possible to in a short period of time from subscription to key drilling (EMM reception). In the TR-B39, it is also possible to define the priority order between the EMM acquisition via the communication channel and the EMM acquisition via the broadcast wave. For example, the key for pay viewing can be unlocked immediately via the communication channel. It goes without saying that raising the priority of processing the EMM via communication after the ECM is effective in terms of user convenience. (B5)
The control unit determines whether the tuner unit is receiving terrestrial digital television broadcast, BS digital broadcast / wideband CS digital broadcast, or advanced broadband satellite digital broadcast. On the assumption that the frequency at which the first control information (EMM) is sent is the same, or on the assumption that the number of processing obligations of the first control information (EMM) is the same, The first control information (EMM) is processed by sharing information of frequency or the number of determinations.

According to the configuration of (B5), the processing in the receiver is simplified. The same EMM processing timing becomes possible irrespective of the reception network (terrestrial digital, 2 KBS, 2 KCS, 4K8 KBS, 4K110CS). (B6)
The control unit controls whether the tuner unit is receiving BS digital broadcast / broadband CS digital broadcast or the first case receiving advanced broadband satellite digital broadcast.
Assuming that the frequency at which the first control information (EMM) is sent is the same, or assuming that the number of processing obligations of the first control information (EMM) is the same, Alternatively, the first control information (EMM) is processed by sharing the information of the determination of the number,
In the second case, in which the tuner section is receiving a terrestrial digital television broadcast, the first control information ( EMM).

According to the configuration of the above (B6), the frequency at which the EMM is transmitted differs from the TR-B14,
B15 and B39 have the same frequency. TR-B15 and TR-B39 including a pay system and terrestrial digital broadcasting (separated by TR-B14) having substantially no pay broadcast have advantages similar to the above (B3). Further, by setting the frequency of the TR-B 14 to be low, it is highly possible that the number of terrestrial digital tuners mounted can be increased. (B7)
The tuner unit receives the first control information (EMM) corresponding to the one business entity and an EMM individual message transmitted for each receiver and indicating a pointer of an automatic display message, and receives an EMM individual message;
The control unit processes the first control information (EMM) corresponding to the one business entity and the EMM individual message separately.

(B8) <A configuration in which the number of EMM frequencies (processing duties) of the EMM and the EMM individual message is different>
The tuner unit receives the first control information (EMM) corresponding to the one business entity and an EMM individual message transmitted for each receiver and indicating a pointer of an automatic display message; In order to determine the frequency of the first control information (EMM) and the frequency of the EMM individual message on the assumption that the frequencies of the first control information (EMM) and the EMM individual message corresponding to And processes the first control information (EMM) and the EMM individual message.

According to the above configurations (B7) and (B8), the number of EMM frequencies (processing obligations) of EMMs and EMM individual messages is different. As a result, the case where the CAS module response performance of the EMM and the EMM individual message is different is sufficiently assumed, the short response time, 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 possible to define the frequency to be higher than that of the EMM. Also, compared to the EMM, the EMM individual message is an individuality part (for example, the name of a subscriber, etc.) of each ID of the EMM mail or the automatically displayed message, and the actual use frequency is considered to be less. EMM and ECM processing is performed by reducing the frequency of EMM because immediacy such as confirmation is not required, that is, by setting the number in a span longer than the EMM processing grace period or by reducing the number even in the same processing grace period. It is expected as an advantage that the time for turning on the display increases. (B9)
The frequency of the first control information (EMM) is set according to the processing delay of the first control information (EMM).

According to the configuration of the above (B9), the EMM frequency is determined by the EMM processing grace period. Thus, the number of EMMs required at an arbitrary time within the grace period is processed. It can be said to be an effective setting method. When considering the flow of the receiver, the degree of freedom increases if it is determined during this period. (B10)
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).

According to the configuration of (B10), the EMM frequency is determined by the Ks update cycle. The EMM processing grace period is currently 30 seconds, and the Ks update cycle is shorter. When considering the filtering performance of the EMM in the receiver, the specification of the number of EMMs in a short time is significant in terms of how much EMMs may be addressed to the receiver in a short time. However, this is a case where a business issues a plurality of EMMs in a short time. Issuing a plurality of EMMs in a short period of time is effective when there is a mistake in acquiring an EMM in a receiver or when the same EMM is to be transmitted in a short period of time when an EMM should be acquired as soon as possible. However, if only the transmission rate of the EMM is used, the EMM does not always have the processing grace period (30 seconds) set and the cache area of the EMM increases. Is valid. (B11) <Determine EMM frequency by Ks update cycle> The frequency of the first control information (EMM) is determined by the processing grace period of the first control information (EMM) and the grace period of the first control information (EMM). Set based on the update cycle of the second key (Ks),
According to the configuration of (B11), in the configuration of (B11), the EMM frequency is determined by the Ks update cycle. If you only need to receive one in 30 seconds, or if you want to receive it as soon as possible, for example, "The receiver needs at least one process per business entity in 30 seconds. The EMM is transmitted at a rate of 2 in 2 seconds, but after receiving the EMM, the EMM acquired in the next 30 seconds may be discarded or not received. " Can send the remaining time to the EMM and ECM processing of other tuners, and send more EMMs for a certain period of time, enabling faster EMM reception, enabling the viewer to confirm the contract in a shorter time And the receiver can also estimate the amount of temporary EMM cache.

In addition to the above points, in the present embodiment, a broadcast signal transmission system described below. (C1)
On the receiving side,
Receives first control information (EMM) including at least an encrypted first key (Kw), second control information (ECM) including an encrypted second key (Ks), and a service signal including scrambled content A tuner section, a descrambler for receiving the scrambled content output from the tuner section, a control section for controlling at least the tuner section, the descrambler, and the first control information (EMM) controlled by the control section. ), The first key (Kw) is obtained using a unique third key (Km), and the first key (Kw) obtained from the second control information (ECM) is used. A CAS module (IC card) for acquiring the second key (Ks) to be given to the descrambler; Frequency control information (EMM) is sent has set to be a minimum R (1 or more integer) within EMM processing grace period (30 seconds), the broadcast signal transmission system. (C2) In terrestrial digital television broadcasting and BS digital broadcasting / broadband CS digital broadcasting,
Assuming that each of the transmission facilities transmits the first control information (EMM) at the same frequency, or that the number of processing obligations of the first control information (EMM) is the same,
The broadcast signal transmission system according to C1 above, wherein the reception side can process the first control information (EMM) by using information for determining the frequency or the number in common. (C3) In the terrestrial digital television broadcasting and the advanced broadband satellite digital broadcasting, the transmission facilities transmit the first control information (EMM) at different frequencies within the EMM processing grace period (30 seconds), or The number of processing obligations of the first control information (EMM) is different, and the reception side can process the first control information (EMM) by changing 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 sets the first control information (EMM) within an EMM processing grace period (30 seconds). ) Is sent at different times, or the number of processing obligations of the first control information (EMM) is different, and the information for judging the frequency or the number at the receiving side is made different to obtain the first control information (EMM). The broadcast signal transmission system according to (C1), wherein the control signal (EMM) can be processed. (C5) In the BS digital broadcast / broadband CS digital broadcast and the advanced broadband satellite digital broadcast, the transmission facilities transmit the first control information (EMM) at the same frequency, or the first control The information (EMM) is assumed to have the same number of processing obligations, and the reception side can process the first control information (EMM) by sharing the information of the determination of the frequency or the number. The broadcast signal transmission system according to C1). (C6) In the first case of BS digital broadcast / broadband CS digital broadcast and advanced broadband satellite digital broadcast, each of the transmission facilities sets the frequency at which the first control information (EMM) is transmitted to be the same. Alternatively, it is assumed that the number of processing obligations of the first control information (EMM) is the same, and the reception side processes the first control information (EMM) using the same information for determining the frequency or the number. On the receiving side, in the second case of terrestrial digital television broadcasting, the frequency or the number of pieces of information for judging the number is made different from the first case to obtain the first control information ( The broadcast signal transmission system according to (C1), wherein the broadcast signal transmission system is capable of processing EMM). (C7) The transmission facility transmits the first control information (EMM) corresponding to the one entity and an EMM individual message indicating a pointer of an automatic display message transmitted for each receiver, and the receiving side includes: The broadcast signal transmission system according to (C1), wherein the first control information (EMM) corresponding to the one business entity and the EMM individual message are processed separately. (C8) The transmission facility transmits the first control information (EMM) corresponding to the one entity and an EMM individual message indicating a pointer of an automatic display message transmitted for each receiver, and the receiving side transmits the EMM individual message. Assuming that the frequencies of the first control information (EMM) and the EMM individual message corresponding to one business entity are different from each other, the frequency of the first control information (EMM) and the frequency of the EMM individual message are The broadcast signal transmission system according to (C1), wherein the first control information (EMM) and the EMM individual message can be processed by differentiating information for determination. (C9) The broadcast signal according to any one of C1 to C8, wherein the frequency of the first control information (EMM) is set according to a processing grace period of the first control information (EMM). Transmission system. (C10) 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 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 the above C1 to C8, which is set based on the broadcast signal.

  Although several embodiments of the present invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents. Furthermore, in each component of the claims, a case where the component is divided and expressed, a case where a plurality is combined, or a case where these are combined is also included in the scope of the present invention. Further, a plurality of embodiments may be combined, and an embodiment constituted by this combination is also within the scope of the invention.

  In addition, in order to make the description clearer, the drawings may be schematically illustrated with respect to the width, thickness, shape, and the like of each part as compared with actual embodiments, but are merely examples, and the present invention is not limited thereto. It does not limit the interpretation. In the specification and the drawings, components that perform the same or similar functions as those described in regard to a drawing thereinabove are marked with the same reference numerals, and a repeated detailed description may be omitted as appropriate. . Also, when the claims are expressed as control logic, when expressed as a program including instructions for causing a computer to execute, and when the instructions are expressed as a computer-readable recording medium, the apparatus of the present invention is applied. is there. 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 contents and the same purpose.

100 broadcast station, 101 broadcast station server, 102 first security function, 103 first basic function, 120 service provider device, 140 receiver 141, a communication control unit, 142, a second basic function, 143, a second security function, 144, an application management function, 145, an API, 146, an application, 160 ... Display device, 162 HDD, 201 Video encoder, 306 Video decoder, 309 Analysis unit, 330 Control unit, 327 Display control unit, 328 ..Display device, 329 speaker, tuner section 501, first tuner section 801-1, 901-1, 1301-1, second tuner section 801-2, 901- Two, one 01-2, third tuner section ... 1301-3, descrambler ... 502, 802, 902, 1302, control section ... 506, 806, 906, 1306, IC card ... 511, 811, 13111, first IC card 9111-1, second IC card 9111-2, tuner / demodulator section 1501, first tuner section (4K8K) 1601-1, 1801-1, 2nd tuner section (4K8K) ... 1601-2, 1801-2, 3rd tuner section (4K8K) ... 1601-3, 1801-3, 4th tuner section (2K) ... 1801-4, 5 tuner section (2K): 1801-5, descrambler: 1502, 1602, first descrambler: 1802-1, second descrambler: 1802-2 The control unit ··· 506,806,906,1306, CAS module ... 1511,1611,18111.

According to an embodiment, in a method for transmitting and receiving a first service signal broadcast by a first entity including at least one of terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting,
The sender is
The transmitting unit transmits the content including the video signal;
An EMM sending unit sending first control information (EMM) of the first business entity including the encrypted first key (Kw);
An ECM sending unit sending second control information (ECM) of the first business entity including an encrypted second key (Ks);
Scrambler, to scramble the content in the second key (Ks),
A multiplexing unit multiplexes the scrambled content, the first control information (EMM) of the first entity and the second control information (ECM) of the first entity, and outputs a stream. To do,
Has,
The receiving side
Tuner unit, including the first service signal the first entity sends the digital terrestrial television broadcasting, and receiving at least one of the BS digital broadcasting and the broadband CS digital broadcasting, the first included in the service signal, the including the first control information of the first entity, including the encrypted first key (Kw) (EMM), the encrypted second key (Ks) the second control information of the first entity (ECM), as well as receiving the scrambled content,
A descrambler descrambles the scrambled content output from the tuner unit,
The control unit checks a predetermined table of the stream output from the descrambler,
Extracting the first control information (EMM) and the second control information (ECM) based on a packet ID included in the predetermined table;
Controlling the tuner section and the descrambler,
The first control information (EMM) of the first business entity received by the tuner unit is stored in a first buffer, and the second control information (ECM) of the first business entity received by the tuner unit is stored. In a second buffer,
CAS module is controlled by the control unit, from the first control information of the first entity (EMM), and obtaining the first key (Kw) using the unique third key (Km), from said second control information of the first entity (ECM), using the acquired first key (Kw), obtaining a second key (Ks) for providing said descrambler,
With
Further, the control unit includes:
A predetermined number first command transmission corresponding to the first control information of the stored in the received first buffer first entity (EMM) by the tuner portion together when performed on CAS module, performing a second command transmission corresponding to the second control information of the first entity stored in the received second buffer by the tuner unit (ECM) to the CAS module,
The first buffer stores the first control information (EMM) of the first business entity received by the tuner unit, and the second buffer stores the second control information (ECM) of the first business entity. Is not stored, the first command transmission corresponding to the first control information (EMM) of the first business entity is performed to the CAS module,
Wherein said first received by the tuner unit to the buffer the first control information of the first entity (EMM) is stored, the second control information of the first entity to the second buffer (ECM) There when it is stored, the first command transmitted corresponding to said first control information of the first entity (EMM) until performing the CAS module, of the first entity performs the second command transmission corresponding to the second control information (ECM) to the CAS module, transmitting and receiving method is provided.

Claims (2)

A method for transmitting and receiving a first service signal broadcast by a first entity including at least one of terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting,
The sender is
The transmitting unit transmits the content including the video signal;
An EMM sending unit sending first control information (EMM) of the first business entity including the encrypted first key (Kw);
An ECM sending unit sending second control information (ECM) of the first business entity including an encrypted second key (Ks);
A scrambler scrambling the content with a second key (Ks);
A multiplexing unit multiplexes the scrambled content, the first control information (EMM) of the first entity and the second control information (ECM) of the first entity, and outputs a stream. To do,
Has,
The receiving side
A tuner unit that receives at least one of the terrestrial digital television broadcast, the BS digital broadcast, and the broadband CS digital broadcast including a first service signal transmitted by a first entity, and First control information (EMM) of the first entity including an encrypted first key (Kw) included in a signal, the first entity including an encrypted second key (Ks) Acquiring the second control information (ECM) and the scrambled content of the
A descrambler descrambles the scrambled content output from the tuner unit,
The control unit checks a predetermined table of the stream output from the descrambler,
Extracting the first control information (EMM) and the second control information (ECM) based on a packet ID included in the predetermined table;
Controlling the tuner section and the descrambler,
A CAS module controlled by the control unit to acquire the first key (Kw) from the first control information (EMM) of the first business entity using a unique third key (Km); Using the obtained first key (Kw) from the second control information (ECM) of the first business entity to obtain the second key (Ks) to be given to the descrambler;
A first buffer and a second buffer each hold the first control information (EMM) of the first business entity and hold the second control information (ECM) of the first business entity;
With
Further, the control unit includes:
Until the predetermined number of first commands corresponding to the first control information (EMM) of the first business entity received by the tuner unit are transmitted to the CAS module, the first command received by the tuner unit is transmitted. Sending a second command corresponding to the second control information (ECM) of the first entity to the CAS module;
After the first control information (EMM) of the first business entity received by the tuner unit is input to the first buffer, the second control information (EMM) of the first business entity is input to the second buffer. If no ECM) is input, the first command of the first entity is transmitted to the CAS module,
When the second control information (ECM) of the first business entity is input to the second buffer, the first command corresponding to the first control information (EMM) of the first business entity Transmitting a second command corresponding to the second control information (ECM) of the first business entity to the CAS module before transmitting the command to the CAS module. The tuner unit is configured to transmit from the first service signal broadcast by the first entity to an n-th service signal including first control information (EMM) of an n-th (n is an integer) entity. , N service signals can be received,
The first buffer may include, from the first control information (EMM) of the first business entity, n pieces of the first control information (EMM) of the nth business entity by the control unit. The transmission / reception method according to claim 1, wherein the input / output (EMM) has a size exceeding n.

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