JP2019017030A - Receiver - Google Patents

Abstract

To provide a receiver enabling a user to view a subscribed program without failing to execute ECM and EMM processes necessary for descrambling.SOLUTION: A receiver comprises: a tuner section which receives a service signal; a descrambler which receives a scrambled content output from the tuner section; a control section which controls at least the tuner section and the descrambler; and a CAS module which acquires a second key (Ks) to be given to the descrambler. The control section is set to execute processes of at least R (an integer of 1 or more) EMM within an allocated process execution period from when the EMM is received from one entity to when a command is transmitted to the CAS module. Then, even when detecting the reception of additional EMM after processing R EMM during the allocated process execution period for the previously detected EMM from one entity, the control section suspends the transmission of the command to the CAS module with respect to the previously detected EMM until an elapse of the allocated process execution period for the same.SELECTED DRAWING: Figure 25

Description

  The description of the embodiment relates to a receiving apparatus that receives a broadcast signal, but further extends to a broadcast signal transmitting apparatus, a broadcast signal transmitting / receiving apparatus, and a method for realizing the apparatus.

  Currently broadcasting multiple terrestrial television broadcasts, BS digital broadcasts, broadband CS digital broadcasts at the same time, such as a function to record two different programs simultaneously (double recording function) and an all-channel recording function. Devices capable of simultaneously recording (recording) recorded programs have been commercialized.

  On the other hand, these broadcasts are scrambled in almost all channels regardless of whether they are pay broadcasts or free broadcasts, and a conditional access system (CAS) module (IC card) is essential to receive and view the programs. Yes.

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

  The purpose of scrambled by the above pay broadcast is to establish a pay broadcast business. For this reason, at the time of shipment of receivers, basically all receivers scramble broadcast programs so that they cannot be received, and only subscribers who have signed a contract to view paid broadcasts can scramble paid viewing programs. The receiver can watch the contracted program by passing the key to be unlocked. Thus, a pay broadcasting business is established in which a contracted program can be viewed by signing a receiving contract that pays a consideration.

  A television broadcast mechanism that allows only subscribers to descramble a contracted program is called a conditional access system (CAS). The limited reception system is stipulated in ARIB (Radio Industry Association) standard STD-B25 for domestic terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting, and the conceptual diagram is the standard STD. -B25 Part 1 Described in Chapter 3.

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

  The broadcast station frequently changes and sends the scramble key (Ks) to prevent illegal descrambling (the same key is used for about 1 second). Accordingly, the broadcast station sends an ECM having a scramble key (Ks) of the video in advance of the descramble target video by a broadcast wave.

  On the other hand, when BS digital broadcasting was started in December 2000, ARIB TR-B15 was defined as an operational rule for defining actual operational parameters of this broadcast. The ARIB TR-B15 Part 1 BS Digital Broadcasting Operation Regulations, Volume 5 BS Digital Broadcasting Limited Reception System (CAS) Receiver Specifications and Operation Regulations indicate that the scramble key (Ks) renewal period is However, in view of the two-screen function that has been commercialized (simultaneous viewing) and the so-called endorsement function that records another channel (CH) during viewing, etc., the update cycle of about 1 second described in the standard STD-B25 On the other hand, there is described a background that is defined so that at least two different channels can be simultaneously viewed and recorded if the update cycle is 2 seconds or more.

“Access Control System Standard for Digital Broadcasting” ARIB STD-B25 6.5 Version Revised March 17, 2015, The Japan Radio Industry Association "Access control system for digital broadcasting (2nd generation) and CAS program download system standard" ARIB STD-B61 1.2 edition Revised on December 3, 2015, Japan Radio Industry Association "Technical data for digital terrestrial television broadcasting operation regulations" ARIB TR-B14 6.2 edition Revised on July 6, 2016, Japan Radio Industry Association "BS / Broadband CS Digital Broadcasting Operation Regulation Technical Data" ARIB TR-B15 7.1 Version Revised on July 6, 2016, Japan Radio Industry Association "Advanced Broadband Satellite Digital Broadcasting Operation Technical Documents" 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, and the work key (Kw) is used to obtain the scramble key (Ks) (update cycle 2 seconds). In order to obtain the work key (Kw), it is necessary to decrypt the ECM including the scramble key (Ks) using the master key (Km) unique to the CAS module. It is necessary to decrypt an EMM containing (Kw) (for example, sent once a day).

On the other hand, in the current receiver, a device capable of simultaneously recording (recording) a plurality of programs broadcast at a certain time, such as an all-channel recording function, has been commercialized. That means
(1) An environment in which a large number of tuners can be used simultaneously in the receiver is prepared. In this case, each scramble key (Ks1 to Ksn) for a large number of tuners is required within one second or two seconds, but the receiver examines whether the scramble key can be extracted within a predetermined time. There is a need.
(2) In the limited reception system, EMM is transmitted for displaying / deleting pay broadcast contract information and automatic display messages, but there are mainly two types of transmission purposes. One is EMM transmission for periodic renewal of the expiration date of the paid contract, and the other is when a new subscriber subscribes to a business operator, the request is to immediately unlock the key or delete the automatic display message after the subscription application In some cases, the EMM for erasure is sent immediately in order to comply with the above. At this time, assuming that EMM acquisition is missed by the receiver, the same EMM may be repeatedly sent in the broadcast signal within 1 second or 2 seconds. Since the control unit of the receiver cannot determine whether or not the contents of the EMM have been updated, even under such an environment, the reception can be performed by a large number of tuners described in (1) within one second or two seconds. For each scrambled video signal to be performed, it is necessary that the respective scramble keys (Ks1 to Ksn) are reliably acquired at the receiver.

  The examination for ensuring that the scramble key is acquired in the receiver needs to be examined in the current rules. If the receiver fails to acquire the scramble key, there will be a contractor who cannot view the contracted program.

  Therefore, in the present embodiment, for example, even if there is exactly one CAS module, a receiver (or transmission) that enables viewing of a contracted program without losing the ECM and EMM processing necessary for descrambling. An object is to provide a device or a transceiver.

According to the embodiment, the first control information (EMM) including at least the encrypted first key (Kw), the second control information (ECM) including the encrypted second key (Ks), and the scrambled content A tuner unit for receiving a service signal including:
A descrambler for receiving the scrambled content output from the tuner unit;
A control unit that controls at least the tuner unit and the descrambler;
Controlled by the control unit,
The first key (Kw) is acquired from the first control information (EMM) using a unique third key (Km), and the acquired first key (KM) is acquired from the second control information (ECM). A CAS module (IC card / IC chip) for obtaining the second key (Ks) to be given to the descrambler using Kw),
The controller is
The first control information (EMM) per business entity should be processed at least R (an integer greater than or equal to 1) within the processing grace period (eg, 30 seconds) to the CAS module after receiving the EMM defined in the regulations. After detecting the first control information (EMM) of the one entity and performing R processing within 30 seconds of the EMM processing grace period, the one entity's Provided is a receiving device that suppresses command transmission to the card unit for at least the first control information (EMM) within 30 seconds of the EMM processing grace period when the next first control information (EMM) is detected. .

FIG. 1 is a diagram illustrating a configuration example of the 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 the main configuration of the broadcast station 200. FIG. 3 is a diagram illustrating in detail the configuration of the receiver according to the embodiment. FIG. 4A shows a conceptual diagram of the conditional access system described in Non-Patent Document 1. FIG. 4B shows an ECM for 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). It is a figure which shows the temporal relationship of a signal. FIG. 4C is a conceptual diagram of the conditional access method described in Non-Patent Document 2. FIG. 5 is a basic configuration diagram when the receiver descrambles as described in Non-Patent Document 4. FIG. 6 is a process flowchart of the limited reception process performed by the receiver shown in FIG. FIG. 7 is a diagram conceptually showing a scramble key (Ks) update cycle and ECM and EMM processing. FIG. 8 is a basic configuration diagram of a receiver for descrambling a broadcast wave in the case of having two tuners, compared to the basic configuration of the receiver having one tuner shown in FIG. FIG. 9 is a basic configuration diagram of a receiver for descrambling broadcast waves in the case of having three tuners, compared to the basic configuration of the receiver having two tuners shown in FIG. FIG. 10 is a diagram showing the temporal relationship between the ECM, EMM, and scramble key (Ks). FIG. 11 illustrates the timing at which the transmission side described in Non-Patent Document 4 transmits an ECM including a scramble key (Ks) and the timing at which a video signal descrambled using the scramble key (Ks) included in the ECM is transmitted. It is a thing. FIG. 12 is an explanatory diagram according to an implementation example of limited reception of a receiver in a transmission / reception system according to the transmission rule illustrated in FIG. FIG. 13 is a diagram illustrating an embodiment in which the tuner unit is increased to three and a recording / recording unit is added to the basic configuration of the receiver illustrated in FIG. 5. FIG. 14 is an explanatory diagram according to an implementation example of limited reception of the receiver illustrated in FIG. FIG. 15 is a basic configuration diagram of the advanced BS digital broadcast and advanced broadband CS digital (hereinafter 4K8K) broadcast receiver described in Non-Patent Document 5. FIG. 16 is a basic configuration diagram of another receiver when descrambling a broadcast wave in the case of having three tuner units with respect to the receiver having the basic configuration of FIG. FIG. 17 is an explanatory diagram according to an implementation example of limited reception of the receiver illustrated in FIG. FIG. 18 is a diagram illustrating a basic configuration example of a receiver having two as 4K8K reception tuner units and three as 2K reception tuner units according to another embodiment. FIG. 19 is an explanatory diagram according to an implementation example of limited reception of the receiver illustrated in FIG. FIG. 20 is an explanatory diagram according to a limited reception implementation example of the receiver, as in FIG. FIG. 21A shows the first tuner unit (4K8K) 1801-1, the second tuner unit (4K8K) 1801-2, the third tuner unit (2K) 1801-3, and the fourth tuner unit 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 illustrating a temporal transition in which the integrated CAS module in FIG. 18 performs the ECM and EMM processing on the ECM / EMM illustrated in FIG. 21A. FIG. 22 is a flowchart in which the receiver requests the CAS module to perform ECM and EMM processing in order to give 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 the time when the EMM is received. FIG. 24 is a data processing flowchart of the receiver according to the embodiment that operates according to a predetermined rule. FIG. 25 is a flowchart of the processing shown in FIG. 24. “The reception time of the EMM buffer that is managed for each business entity and is waiting for processing is determined, and the EMM received within the EMM processing grace period (30 seconds) is stored in the EMM buffer. Is a processing flowchart of the EMM reception of the receiver in the case of adding a rule of “discard EMM received later when already existing”.

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

  FIG. 1 is a diagram illustrating a configuration example of the 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, which encodes and multiplexes a video signal, an audio signal, and the like of a broadcast program to generate a broadcast signal (broadcast signal is terrestrial). Broadcast signals of any broadcast wave type such as digital television broadcast, BS digital broadcast, broadband CS digital broadcast, advanced BS digital broadcast, and advanced broadband CS digital broadcast. Therefore, the transmission signal includes a route passing through the satellite. In addition, the transmission signal may include a route through a cable.

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

  The broadcast station server 101 is an area in which metadata such as a program title, program ID, program outline, performers, broadcast date and time, and other data are stored in advance so as to be transmitted to the 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 from a broadcast station.

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

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

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

  Further, the service provider apparatus 120 responds to the request from the receiver 140 that has received the first designation information, and the application management / distribution 121 is used to transmit the application and content stored in the application server 122 to a communication network such as the Internet. To the receiver 140 via.

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

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

  In addition, the second basic function 141 is connected 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 the removable media 170, and data transmission / reception. Also manage.

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

  The communication control unit 142 has an I / F with a communication network, and can acquire applications and contents managed by the service provider device 120 via the communication network.

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

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

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

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

  Outputs of the video encoder 201, the audio encoder 202, the caption encoder 203, and the attached data generation unit 204 are streamed, and these streams are multiplexed by the multiplexing unit 205. The multiplexed stream (broadcast signal) is scrambled by the scrambler 206, sent to the transmitter 207 as a scrambled multiplexed stream, and transmitted from the antenna by broadcast 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 in detail the configuration of a receiver 300 (corresponding to 140 in FIG. 1) according to an embodiment. The receiver 300 has a second basic function 315 (corresponding to 141 in FIG. 1) which is a reception function for receiving broadcast waves.

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

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

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

  In addition, the data broadcast stream separated by the demultiplexer 304 is sent to the data broadcast reception processing unit 305 for reception processing. The data broadcast reception processing unit 305 extracts a display signal to be displayed on the display device 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 caption 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 gamma characteristic setting, display screen size setting, display signal level setting, and the like.

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

  In FIG. 3A, the display device 328 and the speaker 329 are described as examples incorporated in the receiver 300, but an external display device and speaker connected via an I / F such as HDMI may be used. Good. The display control unit 327 controls the content displayed on the display 328 even when the display 328 is an external display connected to the receiver 300 through an I / F such as HDMI.

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

  The transmission control signal included in the control data includes channel identification information and program identification information of the multiplexed video signal program, and further provides an application function for the multiplexed video signal program. First designation information indicating that a 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.

  Furthermore, the receiver 300 includes 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), and an application 325 (146 in FIG. 1). Included).

  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 other devices (not shown) on the home network via the network I / F 341. , Content protection processing is performed when output to a connected peripheral device (not shown, corresponding to 162 and 170 in FIG. 1). The API 324 is an I / F for the application management function 323 and the application 325 to operate in cooperation.

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

  Note that the codec type of the video decoder 306 is 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 broadband CS digital broadcast, narrowband CS digital. MPEG-2 (terrestrial digital television broadcast, BS digital broadcast, broadband BS digital broadcast), H.264, or the like as a codec type corresponding to a received broadcast such as broadcast. H.264 (AVC: Advance Video Coding) (Narrowband CS Digital Broadcasting), H.264. Any of H.265 (HEVC: High Efficiency Video Coding) (Advanced BS digital broadcasting, Advanced broadband CS digital broadcasting) may be used. The codec type is not limited to this. The communication control unit 340 includes a network I / F 341 that is an I / F with the communication network 351 and a remote control I / F 342 that is an I / F with a remote controller (remote controller) 352.

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

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

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

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

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

  On the other hand, the CAS module 303 inserted in the receiver 300 includes a decryption unit 425 that decrypts the ECM using the work key 422, and a decryption unit 426 that decrypts the EMM using the master key 423. It is a decryption unit managed by the CAS module 303 inserted in. 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 broadcast station 200 generates the ECM 410 including the scramble key (Ks) and the EMM 411 including the work key (Kw) at each necessary timing. The broadcast station 200 multiplexes the generated ECM 410 and EMM 411 with other program contents and the like, scrambles by the scrambler 400 using the scramble key (Ks) 401 transmitted by the broadcast wave at that time, and by the broadcast wave Send.

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

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

  The ECM 410 is related information common to receivers transmitted by the broadcast 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 related information of a receiver identification unit (CAS module ID unit) transmitted by the broadcast station 200. The EMM 411 includes a work key (Kw) 402 used for encrypting the ECM 410. The EMM 411 is encrypted by the encryption unit 406 using the master key (Km) 403. In other words, the receiver 300 is installed in the installed CAS from the EMM that is related information of the receiver identification unit (CAS module ID unit) that is linked one-to-one with the master key (Km) that the broadcast station 200 broadcasts. 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 included in the decryption. The work key (Kw) can be extracted, and the encrypted ECM can be decrypted using the extracted work key (Kw), and the scramble key (Ks) included therein can be extracted.

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

  That is, the broadcast station 200 can encrypt the EMM 411 using the master key (Km) 403 by the information CAS module ID (card ID) obtained at the time of the subscriber's application. Further, the broadcast station 200 can set the EMM 411 to be transmitted for each subscriber by setting the CAS module ID (card ID) information obtained at the time of the subscriber's application in the non-encrypted portion of the EMM 411. it can.

  The receiver 300 extracts the EMM 411 addressed to itself from the received information of the CAS module ID (card ID) in the non-encrypted part of the EMM 411, and transmits the extracted EMM 411 addressed to itself to the CAS module 303. The CAS module 303 that has received the EMM 411 uses the master key (Km) 423 stored in a concealed state to decrypt the EMM 411 by the decryption unit 426 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 contained 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) inside.

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

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

  FIG. 4B shows an ECM for 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). It is a figure which shows the temporal relationship of a signal.

  Reference numeral 440 denotes a temporal transition of a broadcast signal of a program received by the receiver 300. Reference numeral 441 denotes a temporal transition of a scramble key (Ks) used for descrambling the broadcast signal 440. Ks0, Ks1, and Ks2 are scramble keys (Ks) used for descrambling the broadcast signal. The scramble key (Ks) used for descrambling the broadcast signal is updated in units of 2000 ms.

  Reference numeral 442 represents a temporal transition of the ECM received by the receiver 300 and the scramble 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 scramble keys (Ks) of both an ODD (odd number) key and an 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 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 this ECM2 is the timing of T20 that is 1600 ms ahead of T11. Thus, 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 temporal 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 period of the scramble key (Ks) in 4B is changed from 2000 ms to 8000 ms, and the timing of receiving the ECM in advance is changed 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 the same as FIG. 4A. 450, 451, 452, 453, 454, 455, 456, 460, 461, 470, 471, 472, 473, 474, 475, 476 of FIG. 4C are respectively 400, 401, 402, 403, 404, FIG. 405, 406, 410, 411, 420, 421, 422, 423, 424, 425, 426.

  In broadcasting, the same signal is sent to all receivers, so if the scramble key (Ks) is used continuously for a long time, the scramble method itself is a public method stipulated in the ministerial ordinance notification. It is possible to analyze Ks by brute force of etc. When such a situation occurs, the purpose of limited reception cannot be achieved. Therefore, in the current broadcasting, a scramble key (Ks) that changes with time is used. In Non-Patent Document 1, the usage time of the same Ks is defined as a minimum of about 1 second per ECM.

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

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

  The receiver 500 includes a tuner unit 501 (corresponding to 301 in FIG. 3), a descrambler 502 (corresponding to 302 in FIG. 3), a TS (Transport Stream) decoding unit 503 (corresponding to 304 in FIG. 3), video / audio decoding. Unit 504 (corresponding to 306 and 307 in FIG. 3), display unit 505 (corresponding to 327 in FIG. 3), control unit 506 (corresponding to 330 in FIG. 3), and key input unit 507 (corresponding to 342 in FIG. 3). Including. The TS decoding unit 503 analyzes the transmitted descrambled broadcast signal, sequentially extracts transmission control signals, and transmits them 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 transmitted from the TS decoding unit 503. Further, the control unit 506 can receive an operation input signal from the remote controller 510 via the key input unit 507. The IC card 511 (corresponding to 303 in FIG. 3) is a CAS module 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 process flowchart of the limited reception process performed by the receiver 500 shown in FIG.

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

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

  The control unit 506 recognizes the EMM PID (Packet Identifier) 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 card ID information, the control unit 506 transmits the EMM to the IC card 511. The IC card 511 that has received the EMM from the control unit 506 decrypts the EMM encrypted using the master key (Km) stored therein, extracts the work key (Kw), and stores it (S611).

  Further, the control unit 506 refers to the received PAT (S605), receives the PMT of the service_id to be selected (S606), recognizes the ECM PID included in the received PMT, and receives the ECM (S607). ). When 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 that has received the scramble key (Ks) transmits the received scramble key (Ks) to the descrambler 502. The descrambler 502 sets the received scramble key (Ks) inside.

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

  If the EMM is not received even though it is not contracted or contracted, a response indicating that the 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 in the display unit 505 and displays it on the monitor.

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

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

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

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

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

  Actually, Non-Patent Document 4 explains as follows.

"A-3-2 Update cycle,
The update period of ECM is described in 5.8.5 ECM update / retransmission in this volume. As timing according to the processing capacity of the IC card,
・ Assuming a maximum processing time of 800 ms for 1 ECM ・ Receiver specifications are assumed on the premise that the update interval of different ECMs is 1000 ms or more. Along with the revision of this document ver1.0, the update cycle has been reviewed assuming the following.
・ BBS program recording can be processed with one IC card while watching BS broadcast on TV screen.
-The same thing can be done with a single IC card for simultaneous display of any two BS channel screens.
From the above, if the ECM update interval is 2000 ms or more, at least two scrambled services can be processed with one IC card at least for input in different TSs. "
In other words, since the CAS module (IC card) compliant with Non-Patent Document 1 can process a scramble key (Ks) update cycle of 1 second, by setting the ECM update cycle to 2 seconds, at least Two channels (two tuners) can be processed.

  In other words, by setting the ECM update cycle to 2 seconds, a non-patent document 1 compliant CAS module (IC card) allows up to two channels (two tuners) in accordance with the operation regulations regardless of its command response performance. It will be done.

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

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

  702 is a state of ECM and EMM processing when a CAS module (IC card) compliant with Non-Patent Document 4 is inserted into a receiver having two tuner sections (first tuner section 1 and second tuner section). Is shown. 702-1 is a state of ECM and EMM processing for the first tuner unit, and 702-2 is a state of ECM and EMM processing for the second tuner unit.

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

  FIG. 8 is a basic configuration diagram of a receiver 800 for descrambling broadcast waves in the case of having two tuner units, compared to the basic configuration of a receiver having one tuner unit shown in FIG. It is. 8 is different from FIG. 5 in that one tuner unit is added and the first tuner unit 801-1 and the second tuner unit 801-2 are configured, and distribution is performed in order to correspond to the two tuner units. A device 813 is added, and a built-in recording / recording unit 812 is added. The other 802 to 810 and 811 are the same as 502 to 510 and 511 in FIG.

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

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

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

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

  The control unit 806 recognizes the EMM PID 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 the control unit 806 extracts the EMM addressed to itself based on the card ID information, the control unit 806 transmits the EMM to the IC card 811. The IC card 811 that has received the EMM from the control unit 806 decrypts the EMM that has been encrypted using the master key (Km) provided therein, and extracts and stores the work key (Kw).

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

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

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

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

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

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

  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 the control unit 806 extracts the EMM addressed to itself based on the card ID information, the control unit 806 transmits the EMM to the IC card 811. The IC card 811 that has received the EMM from the control unit 806 decrypts the EMM that has been encrypted using the master key (Km) provided therein, and extracts and stores the work key (Kw).

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

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

  The processing of the IC card 811 is started by a request from the receiver, but the 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. It is a rule 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 the 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 ECM retransmission period and issues an ECM reception command for requesting the processing. To do.

  Similarly, in the EMM processing, the IC card 811 is included in the EMM processing included in the broadcast wave selected by the first tuner unit 801-1 and the broadcast wave selected by the second tuner unit 801-2. Therefore, the control unit 806 adjusts the timing for requesting each EMM process so that it does not overlap with the timing for requesting the ECM process. In response to this, a command is issued.

  The IC card 811 has already received the contracted EMM at the time of processing the ECM included in the broadcast wave selected by the first tuner unit 801-1, and the work key (Kw) is received from the received EMM. ) Can be extracted, the EMC requested for processing can be decrypted and the scramble key (Ks) can be extracted 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 of 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) inside. 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, converted into a predetermined recording format (for example, a TS format encrypted with a device-binding unique key) and recorded in the recording / recording unit 812.

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

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

  When the receiver is equipped with three or more tuners, for example, when the so-called W endorsement function capable of recording two different channels simultaneously in addition to the program being viewed, the ECM processing and EMM processing are complicated. Become.

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

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

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

  The channel 1 broadcast wave to be monitored is selected by the first tuner unit 901-1, and simultaneously the channel 2 broadcast wave to be recorded by the recording / recording unit 912 is selected by the second tuner unit 901-2 and simultaneously recorded. A process in the case where the third tuner unit 901-3 selects the broadcast wave of channel 3 recorded by the recording unit 912 will be described.

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

  If it is determined that the transmission is not performed, the control unit 906 refers to the NIT sent from the TS decoding unit 903 and controls the first tuner unit 901-1 to select the broadcast wave in which the service_id_1 is transmitted. To do.

  The control unit 906 recognizes the PID of the EMM included in the CAT arranged in the selected broadcast wave and receives the EMM. 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 card ID information, the control unit 906 transmits the EMM to either the predetermined first IC card 911-1 or the 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 EMM that has been encrypted using the master key (Km) inside, and extracts the work key (Kw). And save.

  Further, the control unit 906 refers to the received PAT, receives the PMT of service_id_1 to be selected, recognizes the ECM PID included in the received PMT, and receives the ECM. When receiving the ECM, the control unit 906 issues an ECM reception command to either the predetermined first IC card 911-1 or the 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).

  When the first IC card 911-1 or the second IC card 911-2 normally extracts the scramble key (Ks), it 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 audio signal included in the broadcast signal descrambled by the descrambler 902 are separated by the TS decoding unit 903 and then decoded by the video / audio decoding unit 904. The decoded video signal and audio signal are output to a monitor and a speaker (not shown).

  In the scheduled recording, the user makes a reservation for recording desired programs on two different channels at the same time in an electronic program guide (EPG, not shown), etc. At the time near the start time, the second tuner unit 901-2 and the third tuner unit 901-3 are controlled to select the channel reserved for recording.

  The control unit 906 recognizes the PID of the EMM since it is included in the CAT arranged in the selected broadcast wave, and receives the EMM. 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 card ID information, the control unit 906 transmits the EMM to the predetermined first IC card 911-1 or second IC card 911-2. The first IC card 911-1 or the second IC card 911-2 that has received the EMM from the control unit 906 decrypts the EMM that has been encrypted using the master key (Km) inside, and extracts the work key (Kw). And save.

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

  Since the IC cards 911-1 and 911-2 are collateralized by the operation regulations for up to two channels simultaneously with one IC card, the first tuner unit 901-1, the second tuner unit 901-2, In addition, it is necessary to set the correspondence relationship between the first tuner card 911-1 and the second IC card 91-2, which are CAS modules that perform CAS processing, with the third tuner unit 901-3 on a setting screen such as a user interface. Yes (not shown).

  For example, the first tuner unit 901-1 and the second tuner unit 901-2 are 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. In this case, a contract is made to acquire the right to view channels A, B, and C provided as pay broadcasts with the card ID information of the first IC card 911-1, and the card ID of the second IC card 911-2. In the case where a subscription contract is made to acquire the right to view channels D, E, and F provided as pay broadcasts with the information in FIG. If the first tuner unit 901-1 selects channel C, the second tuner unit 901-2 selects channel A, and the third tuner unit 901-3 selects channel F, the contracted pay broadcast The correspondence between the channel and the first IC card 911-1 and the second IC card 911-2 can be taken.

  However, when the third tuner unit 901-3 tries to process the broadcast wave of channel A, the second IC card 911-2 is not contracted to view the broadcast wave of channel A, so the second IC card In 911-2, EMM including contract information for viewing channel A cannot be extracted, and as a result, the broadcast wave of channel A cannot be descrambled. If one IC card (CAS module) subscribes to three different channels (for example, channels A, B, and C) and receives an EMM, one of these three channels is not viewed at different times. Although it is possible to record, it is conceivable to perform simultaneous processing of simultaneous recording of channels B and C while watching channel A. However, as described above, as described in Non-Patent Document 4, one IC card can only process up to two channels (tuners) TS at the same time. There are problems such as the fact that the card cannot process TS of three different channels simultaneously.

  Therefore, in the present embodiment, attention is focused on the following as main points.

  In the present embodiment, in a receiver equipped with a plurality of tuners for the convenience of the user, the number of tuners and a plurality of IC cards are set as little as possible to reduce the burden and cost of setting the association relationship between the plurality of tuners and the plurality of IC cards. Rules are created to enable processing with an IC card (CAS module).

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

  In the present embodiment, one entity newly sets one card ID in consideration of the ECM retransmission cycle, update cycle, command response performance described in the CAS module (IC card) specifications, etc. Specifies the frequency with which EMMs are transmitted or the number of EMMs that the receiver should process within a certain period per entity. In other words, what is newly defined is the number of EMMs to be processed within a certain period. Whether the transmission regulations are defined by the number of transmissions within a certain period or whether the receiver specifications are defined by the number of processes within a certain period. It is means of. This makes it possible to strictly examine how many tuners can perform simultaneous reception processing with one CAS module (IC card). This provides convenience for the receiver manufacturer.

Summarizing the main points in this embodiment can be described as follows:
(1). EMMs and / or EMM individual messages sent to the same receiver (CAS module ID) per entity in ECM retransmission cycles, update cycles, and broadcasts that use access control methods (limited reception methods or content protection methods) A digital broadcast transmission / reception device that regulates the frequency of transmission.

  (1b). Among the EMMs and / or EMM individual messages sent to one CAS module ID, a digital that specifies the minimum number of EMMs that need to be processed in the grace period from when the EMM is received until the command is issued to the CAS module Broadcast transmission / reception device.

  (2). In broadcasting that uses an access control method (limited reception method or content protection method), when receiving, viewing, recording, or recording more than two at the same time, ECM retransmission period, update period, and same reception per entity The transmission frequency of the EMM and / or EMM individual message sent to the machine (CAS module ID) is set, and there is a grace period until the command is issued to the CAS module after receiving the EMM and / or EMM individual message addressed to the receiver. A digital broadcast receiving apparatus that controls 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 CAS module.

  (2b). In broadcasting that uses an access control method (limited reception method or content protection method), when receiving, viewing, recording, or recording more than two at the same time, ECM retransmission period, update period, and same reception per entity From the number of EMMs and / or EMM individual messages that need to be processed in the grace period from receiving the EMM and / or EMM individual message sent to the machine (CAS module ID) to issuing a command to the CAS module, A digital broadcast receiver that controls the issuing schedule.

  (3). In broadcasting that uses an access control method (limited reception method or content protection method), EMMs sent to the same receiver (CAS module ID) per entity and / or EMM individual messages are sent at a predetermined frequency. A digital broadcast transmission device that controls the operation.

  (4). Above (1). In the contents described in the above, the transmission frequency of the EMM and / or EMM individual message addressed to one CAS module ID is defined by the number of EMMs to be transmitted in the grace period from receiving the EMM until issuing a command to the CAS module. Broadcast transmission / reception device.

  (5). Above (1). The digital broadcast transmission / reception apparatus which prescribes | regulates the transmission frequency of the EMM and / or EMM individual message addressed to one CAS module ID by the number of EMM and / or the EMM individual message transmitted per update period of an ECM or a scramble key.

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

  (7). Above (2). The EMM to be transmitted is controlled in a grace period from the reception of the EMM addressed to the CAS module and / or the EMM individual message to the issue of the command to the CAS module. And / or a digital broadcast receiver controlled by the number of EMM individual messages.

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

  (9). Above (2). Of the EMM to be transmitted in the grace period from the reception of the EMM addressed to the CAS module and / or the EMM individual message to the issue of the command to the CAS module. A digital broadcast receiving apparatus that controls the number of EMMs and / or the number of individual EMM messages sent per ECM or scramble key update period.

  (10). Above (3). The transmission frequency of the EMM / EMM individual message to be sent to the same receiver is the same as that described in the above description, from the reception of the EMM and / or EMM individual message to the CAS module to the issue of the command to be performed to the CAS module. A digital broadcast transmitting apparatus that controls the number of EMMs to be transmitted and / or the number of EMM individual messages in the grace period.

  (11). Above (3). The digital broadcast transmitting apparatus for controlling the transmission frequency of EMMs and / or EMM individual messages transmitted to the same receiver by the number of EMMs and / or EMM individual messages transmitted per ECM or scramble key update period.

  (12). Above (3). In this description, the sending frequency of the EMM and / or EMM individual message sent to the same receiver is delayed until the command issued to the CAS module after receiving the EMM / EMM individual message addressed to the CAS module. A digital broadcast transmission apparatus that controls the number of EMMs to be transmitted and the number of EMMs and / or EMM individual messages sent per ECM or scramble key update period during the period.

  Next, it demonstrates from the background that this embodiment exhibits a useful function.

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

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

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

On the other hand, the EMM has an attribute that does not require immediate processing as compared to the ECM, but in some cases, it may not be as immediate as the ECM, but may require processing as quickly as possible. For example,
(A) Viewer A who wants to acquire the right to view a program broadcast by a specific broadcasting station (business entity) calls the customer center of the broadcasting station (business entity) to which he / she wants to subscribe and for troubles when joining. Then, according to the guidance of the telephone, the channel of the broadcasting station is selected by the own receiver, and the card ID number of the receiver of the viewer A is told. (B) The viewer A is in a state of making a phone call, for example. The broadcast station (business entity) immediately transmits an EMM in which the card ID number notified by telephone is set. (C) If the receiver of the viewer A receives the EMM and can extract the scramble key (Ks), The broadcast signal of the channel can be descrambled (so-called key unlock is possible)
(D) Thereby, the viewer A can confirm the completion of the contract procedure.
In the case of the above scenes (a) to (d), the EMM process is not as immediate as the ECM, but it is actually necessary to perform the process as quickly as possible.

  As described above, when the viewing contract procedure is performed while the business entity and the viewer call and the viewer confirms the reception state of the receiver, it is also assumed that the receiver misses EMM reception. Accordingly, it is also assumed that the broadcasting station (business entity) transmits EMMs having the same card ID in bursts for a certain period of time, assuming that the receiver misses EMM reception.

  The ECM may control reception of the ECM so that the receiver receives at least one within a 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 sent to itself, sends all received EMMs to the CAS module (IC card), and requests processing. It is considered to be basic.

  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 CAS module (IC card) response performance is indicated by the CAS module provider, and the EMM reception command is issued to the CAS module (IC card) after the receiver receives the EMM. A grace period was set before the

  According to this rule, EMM is less likely to cause problems on the premise that the frequency of sending to the same CAS module (IC card) is low. It is also assumed that a plurality of EMMs are sent in a short time.

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

Appendix 7 has the following description:
"Appendix 7 Shared Receiver for Current Broadcasting and Advanced BS Digital Broadcasting Reception of Advanced BS Digital Broadcasting and BS Digital Broadcasting / Broadband CS Digital Broadcasting Defined by ARIB TR-B15 or Terrestrial Digital Television Specified by ARIB TR-B14 The following rules apply when the same CAS module is applied to reception of BS digital broadcast / broadband CS digital broadcast and terrestrial digital television broadcast at the time of shared reception where at least one of the John broadcasts can be received. " .

  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 the advanced broadband satellite broadcast (so-called 4K8K broadcast) and the current broadcast (so-called 2K broadcast). There may be a case where a single CAS module (IC card) receives and processes a large number of channels in the future.

  Under such circumstances, in Non-Patent Document 5, Non-Patent Document 3 and Non-Patent Document 4, the difference in ECM (scramble key (Ks)) update cycle, advanced broadband satellite broadcasting (so-called 4K8K) and current broadcasting When the ECM and EMM response performance differs from (so-called 2K), it is essential to study strict timing control regarding the ECM and EMM processing in the receiver.

  However, it is difficult to examine timing control related to processing of ECM and EMM in order to obtain a receiver that can cope with various broadcasting systems and is equipped with a large number of tuners only by the current regulations regarding EMM.

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

  In the conditional access system with the triple key structure shown in FIG. 4A, the ECM update period is set to 2000 ms and the retransmission period is set to 100 ms as the technical specifications on the transmission side, and “EMM is assigned to one CAS module ID per entity. Suppose that a new content of “send one in 30 seconds” is added.

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

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

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

  FIG. 11 illustrates the descrambling using the transmission side of the ECM including the scramble key (Ks) and the scramble key (Ks) included in the ECM, as described in Non-Patent Document 3, Vol. 5, FIG. 5.8-1. The timing for transmitting a video signal to be transmitted is illustrated. The horizontal axis is a time axis.

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

  A section of T1 + T2 is a section in which the same ECM is transmitted. The section T3 is a section in which a video signal descrambled using the scramble key (Ks) included in the ECM transmitted in the section 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 the limited reception 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 limited reception of a receiver in a transmission / reception system according to the transmission rule shown in FIG. 1201 is a temporal transition of the received program. The received program 1201 is scrambled with Ks0 until time T11, scrambled with Ks1 between times T11 and T12, scrambled with Ks2 between times T12 and T13, and scrambled with Ks3 between times T13 and T14. It shows that.

1202 is a temporal transition of the received ECM. ECM2 is received at the timing of time T21, and indicates that the ECM includes Ks1 and Ks2 which are scramble keys (Ks). The receiver receives the program at time T21 while watching the program. The ECM 2 is received and a command is issued to the CAS module (IC card). The CAS module (IC card) completes the ECM processing between the times from section T21 to section T12. The CAS module (IC card) transmits the scramble key Ks2 obtained by the ECM process to the receiver, the receiver sets the MULTI2 descrambler, and the program scrambled using Ks2 from time T12. Descramble.

  When the channel is switched from another channel during the period T22 to T13, the receiver receives the ECM3 and issues a command to the CAS module (IC card).

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

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

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

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

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

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

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

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

  FIG. 13 shows that the tuner unit is increased to three, and the recording / recording unit is added to the basic configuration of the receiver shown in FIG. It is the added block diagram.

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

  The three tuner units may be any one of terrestrial digital television broadcasting, BS digital broadcasting, broadband CS digital broadcasting, or a tuner capable of three-wave tuning, and watch or record any three channels as receiver specifications.・ It shall be recordable.

  The IC card 1311 (CAS module) used here is assumed to have ECM and EMM response performance capable of processing three tuners by one. For example, the response performance of the IC card 1311 is assumed to be 300 ms for ECM response and 500 ms for EMM. Assume that the receiver 1300 transmits one EMM per business entity to the IC card 1311 after receiving the EMM within a grace period that requires EMM processing.

  FIG. 14 is an implementation example of limited reception 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 until time T11, scrambled with Ks1 between times T11 and T12, scrambled with Ks2 between times T12 and T13, and scrambled with Ks3 between times T13 and T14. It shows that. 1402 is a temporal transition of the received ECM.

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

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

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

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

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

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

  Note that 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 EMM that has been encrypted using the master key (Km) stored therein, and extracts and stores the work key (Kw).

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

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

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

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

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

  Scheduled recording is performed by a user on 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 to select the channel reserved for recording at the time near the start time of the program A reserved for recording in accordance with the setting contents of the recording reservation.

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

  If not transmitted as a result of the determination, the control unit 1306 refers to the NIT sent from the TS decoding unit 1303, and selects the broadcast wave in which the service_id_2 of the program A is transmitted. Therefore, the second tuner unit 1301- 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 the control unit 1306 extracts the EMM addressed to itself based on the card ID information, 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 EMM that has been encrypted using the master key (Km) stored therein, and extracts and stores the work key (Kw).

  Note that 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 EMM that has been encrypted using the master key (Km) stored therein, and extracts and stores the work key (Kw).

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

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

  Since the program A is reserved for recording, the partial TS including the video ES, audio ES, subtitle ES, and the like to be recorded and recorded is reconstructed by the control unit, encrypted with the receiver-specific encryption key, HDD, etc. Are stored in the recording / recording unit 1312.

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

  When playing back the reserved recording program A or program B, the recorded program list is displayed on the user interface (not shown) on the screen, and after selecting the program to be played back, the control unit 1306 records the program. Reading from the recording unit 1312, descrambling with a receiver-specific key, and obtaining a compressed video / audio signal, the video / audio decoding unit 1304 decodes the compressed signal, and a monitor or speaker (not shown) Output to.

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

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

  The receiver 1500 includes a tuner unit 1501, a descrambler 1502, an MMT demultiplexing unit 1503, a video / audio decoding unit 1504, a display unit 1505, a control unit 1506, and a key input unit 1507. The MMT demultiplexing unit 1503 analyzes the transmitted descrambled broadcast signal, sequentially extracts transmission control signals, and transmits them to the control unit 1506. The control unit 1506 can control the tuner unit 1501, the descrambler 1502, and the display unit 1505 based on the transmission control signal sent from the MMT demultiplexing unit 1503. The control unit 1506 can 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 or 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 communicating with a communication network. The example of FIG. 15 is a case where there is one CAS module 1511.

  FIG. 16 is a basic configuration diagram of a receiver 1600 for descrambling broadcast waves in the case where three tuner units are provided with respect to the basic configuration of FIG.

  16 differs from FIG. 15 in that there are three tuner sections (first tuner section 1601-1, second tuner section 1601-2, third tuner section 1601-3) and three tuner sections. A distributor 1613 is added to correspond to one tuner unit, and a recording / recording unit 1612 such as an HDD is added. The other portions 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 4K8K broadcast compatible tuner units. The receiver 1600 has specifications that allow viewing or recording / recording any three channels.

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

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

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

  Assume that the receiver 1600 transmits one EMM per business entity to the CAS module 1611 after receiving the EMM during a grace period that requires EMM processing.

  FIG. 17 is an implementation example of limited reception 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 until time T11, scrambled with Ks1 between times T11 and T12, scrambled with Ks2 between times T12 and T13, and scrambled with Ks3 between times T13 and T14. It shows that. Reference numeral 1702 denotes a temporal transition of the received ECM.

  In the example of FIG. 17, the first tuner unit 1601-1, which is the three tuners of FIG. 16, during 7600 ms from the time of ECM update timing T21 including Ks2 to T12 when the scramble key of the broadcast content is switched to Ks2. 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 times T21 and T12, and the EMM received by the second tuner unit 1601-2 is processed between times T22 and T13. The EMM received by the third tuner unit 1601-3 may be processed between times T23 and T14. That is, in this case, the total ECM and EMM processing time of the CAS module 1611 is (ECM response processing time = 600 ms) × (3 tuner) + (EMM response processing time = 650 ms) = 2450 ms ≦ 7600 ms.
In the CAS module 1611, processing can be performed for three tuners.

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

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

  The control unit 1606 obtains 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 in advance and sets it in the MMT demultiplexing unit 1603. The PLT (Package List Table) in the PA message is acquired, and the IP data flow and packet ID for transmitting the MPT (MMT Package Table) of the specified service_id are acquired and set in the MMT demultiplexing unit 1603. The MMT packet with the packet ID is received, the PA message is acquired, and the MPT in the PA message is acquired.

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

  Note that the timing at which the control unit 1606 sends the EMM to the CAS module 1611 is the timing shown in FIG. The control unit 1606 temporarily stores the received 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 master key (Km) stored therein, and extracts and stores the work key (Kw).

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

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

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

  Upon receiving the ECM reception command, the CAS module 1611 decrypts the encrypted ECM using the extracted work key (Kw) and extracts the scramble key (Ks).

  When the CAS module 1611 normally extracts 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 that has received the scramble key (Ks) transmits the received scramble key (Ks) to the descrambler 1602. The descrambler 1602 sets the received scramble key (Ks) inside. The descrambler 1602 descrambles the broadcast signal transmitted from the tuner unit 1601-1 using the set scramble key (Ks) at the necessary timing as shown in FIG.

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

  Scheduled recording is performed by a user on 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 slot reserved in advance in the program guide according to the recording reservation setting. Station to obtain a TLV stream. Through the same processing as that of the first tuner 1601-1, the asset descrambled by the descrambler 1602 is separated by the MMT demultiplexing unit 1603 to separate assets such as video, audio, subtitles, etc. It is encrypted and stored in a recording / recording unit 1612 such as an HDD.

  Similarly to the reserved program C, the reserved program D is stored in the recording / recording unit 1612 after channel selection processing is performed by the third tuner unit 1601-3.

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

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

  The receiver configuration in FIG. 18 is based on the basic configuration of the receiver described in the fifth volume of Non-Patent Document 4 which is a 2K broadcast operation rule. FIG. Reference 5 Based on the basic configuration of the receiver described in the fifth edition, it has the configuration of FIG. 16 in which the number of mounted tuners is increased. Two tuner units for 4K8K reception and two tuner units for 2K reception It is a basic configuration example of a receiver having three.

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

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

  The third tuner unit (2K) 1801-3, the fourth tuner unit (2K) 1801-4, and the fifth tuner unit (2K) 1801-5 are tuners for receiving 2K broadcast terrestrial digital, BS digital, and broadband CS digital broadcasts. It is a demodulator. The first descrambler 1802-1 corresponds to the 4K8K broadcast scramble method AES method, and the second descrambler 1802-2 corresponds to the 2K broadcast scramble method MULTI1 method.

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

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

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

In addition, when the transmission side has newly defined that “the frequency at which one entity sets one card ID within the EMM processing grace period is one in 30 seconds” or newly received According to the regulations on the aircraft side, “EMMs addressed to the CAS ID of its own receiver per entity shall be processed at least one EMM for the CAS module in 30 seconds.
If the receiver receives an EMM that exceeds the standard, it may be ignored or discarded. ”.

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

  FIG. 19 is an implementation example of limited reception of the basic configuration shown in FIG.

  1901 is a temporal transition of the received 4K8K program. The received program 1901 is from time T11-4, from time T11-4 to T12-4, from time T12-4 to T13-4, and from time T13-4 to T14-4. Each scramble key (Ks) is scrambled. Reference numeral 1902 denotes time transition of reception of ECM and EMM for the 1901 program. Reference numeral 1903 denotes a temporal transition of the received 2K program. The received program 1903 is until 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. Each scramble key (Ks) is scrambled. Reference numeral 1904 denotes time transition of reception of ECM and EMM for the program 1903.

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

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

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

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

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

  That is, the processing of the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 can be performed during 7600 ms until the ECM is updated and the Ks of the broadcast signal is updated. In the same way as in the case of an entity with different channels selected by the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2, the first tuner unit (4K8K) for 30 seconds. ) It is necessary that at least one EMM transmitted through the channel selected by 1801-1 and the second tuner unit (4K8K) 1801-2 can be processed.

  From the above, first, the Ks update cycle of 2K broadcasting is shorter than the Ks update cycle of 4K8K, and more immediate processing is required for ECM and EMM. Therefore, as a priority, when performing ECM processing in 2K broadcasting, 3 tuners are performed within 1600 ms after every update of ECM, then ECM processing in 4K8K broadcasting is performed, and then 2K broadcasting or 4K8K broadcasting is performed. It is reasonable to prioritize the processing of processing the EMM. It is verified whether processing using one CAS module 1811 can be performed with the priority of the above processing.

  As the most severe examples, there are five tuner sections (first tuner section (4K8K) 1801-1, second tuner section (4K8K) 1801-2, third tuner section (2K) 1801-3, fourth tuner section (2K) 1801. -4, in the program received by the tuner unit (2K) 1801-5), the case where the update timings of the respective scramble keys (Ks) coincide will be described as an example.

  First, the ECMs of the third tuner unit (2K) 1801-3, the fourth tuner unit (2K) 1801-4, and the tuner unit (2K) 1801-5, which are 2K broadcast tuner units, are processed from the ECM update timing T21. Start. Since the 2K broadcast ECM response processing time in the CAS module 1811 is 300 ms, the 2K broadcast third tuner unit (2K) 1801-3, the fourth tuner unit (2K) 1801-4, and the tuner unit (2K) 1801- The response processing time of 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 the 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 process of the first tuner unit 1801-1 is 300 ms × 3 + 600 ms = 1500 ms when there is no processing margin at the receiver. From the end of this response process to the next ECM update timing time T22 of 2K broadcasting Since it is only 500 ms, it is short to further process ECM of 4K8K broadcasting.

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

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

  Next, at the ECM update timing T24 of 2K broadcasting, three tuners for 2K broadcasting (third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, tuner unit (2K) 1801-5). After the ECM processing, the EMM processing of the first tuner unit (4K8K) 1801-1 which is a 4K8K tuner is performed. At this time, Ks update of 2K broadcast is performed four times, and after 8 seconds, the process shifts to 4K8K Ks update timing T12-4.

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

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

  By controlling the order of the processes as described above, the first tuner unit (4K8K) in 4K8K broadcast scramble key (Ks) update timings T11-4, T12-4, T13-4 and 8 seconds × 3 = 24 seconds 1801-1, second tuner unit (4K8K) 1801-2, third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, fifth tuner unit (2K) 1801-5 EMM At least one of them can be processed, and the third tuner unit (2K) 1801-3 and the fourth tuner unit (2K) 1801-4 in 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 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, in the case where the CAS for 2K broadcasting and CAS for 4K8K broadcasting are integrated CAS modules, even when the Ks update cycle of 2K broadcast and 4K8K broadcast is different, in addition to the ECM update cycle and the EMM processing grace period, By defining the minimum number of EMMs that need to be processed per entity within the EMM processing grace period, it is possible to control the processing timing without losing ECM and EMM processing.

  Further, it is assumed that the ECM update cycle is 2000 ms, the retransmission cycle is 100 ms, and that “one EMM is sent to one ID per entity for 30 seconds” is performed.

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

  FIG. 20 is an implementation example of limited reception by 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 the time T12 excluding the EMM processing time is 1600 ms-EMM processing time 400 ms = 1200 ms. Since it is necessary to perform the ECM processing at this time, 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 number of times the scramble key (Ks) is updated 15 times (30 seconds / 2 seconds) in 30 seconds. It can be verified that it is possible to process the EMMs of the four entities within a 30 second grace period with a very long response time.

  In the example of FIG. 20, if no margin for the receiver processing is considered at all, it is possible to process up to 4 ECMs and 2 EMMs during a period of 2000 ms from the scramble key Ks to T12. In 30 seconds, up to 30 EMM processes are possible.

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

  Therefore, even if ECM processing is possible, from the processing capability of EMM, processing up to 3 tuners, that is, processing of 24 EMMs in 30 seconds is possible.

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

  The method for defining the frequency of EMM described above is that the number of EMMs sent per grace period to the CAS module (IC card) after receiving the EMM addressed to the ID of the CAS module (IC card) mounted on the receiver. However, the method to be defined is not limited to this, and it is only necessary to quantitatively define the EMM transmission frequency per card ID per business entity.

  For example, it may be the EMM transmission frequency per one business entity per Ks update period. For example, the maximum number of EMMs that can be transmitted from one entity to one card ID per 2000 ms is a maximum of two.

  Further, as a regulation of the EMM transmission frequency, a regulation based on a combination of a transmission frequency when the transmitting side sends EMM in bursts and a grace period in which processing is suspended for the CAS module after the receiving side receives the EMM, for example, one business There is also a defining method in which the maximum number of EMMs sent from the body to one CAS ID is 3 per 2 seconds and 6 per 30 seconds.

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

  Therefore, the 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 the EMM and the EMM individual message may be defined at different frequencies. For example, the method of specifying “a maximum of two EMM / EMM individual messages to be sent to the same receiver in 30 seconds per entity” is specified at the same frequency. Note that the “maximum of two” numbers are determined in view of the actual performance of the CAS module, and are not limited to this value. An example in which the frequencies of EMM and EMM individual messages are individually defined will be shown.

“Up to two EMMs sent to the same receiver for 30 seconds per entity and up to three EMM individual messages sent to the same receiver for 30 seconds” or EMM. And the EMM individual message, it is also possible to change the width of the transmission time. “Up to two EMMs sent to the same receiver for 30 seconds per entity, and up to three EMM individual messages sent to the same receiver for 2 seconds.”
In this example, the EMM is defined for 30 seconds together with the update frequency of the EMM individual message transmission frequency scramble key (Ks).

  As described above, the frequency of EMM and / or EMM individual message is necessary to determine the number of tuners and to consider 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, on the other hand, the method of subscription application of broadcasters, for example, the method of accepting by telephone as described above, sending immediately without hanging up the telephone, or calling or online without sending immediately It is possible to stipulate according to the actual situation of operation, for example, when sending EMM within a certain period of time (for example, within 30 minutes).

  The above is an example in which the transmission frequency of EMM (including EMM individual messages) is specified in the operation rules. However, assuming that the EMM is missed at the receiver, the same EMM is also retransmitted in a short time as an actual operation. Is assumed. Therefore, in the operation regulations, there is a method of defining the minimum number of EMMs to be received and processed within the grace period for the CAS module after receiving the EMM. For example, “The number of receivers that have received EMM / EMM individual messages addressed to the same receiver should request processing from the CAS module is at least one in 30 seconds per entity. The number of EMMs that exceed this may be discarded. ”The minimum number that the receiver should process in the EMM processing grace period is specified, and the EMM addressed to the receiver (CAS ID) received within the processing grace period is It is a method that can be discarded for those exceeding the regulation.

  As described above, the receiver processes the CAS module (IC card) after receiving the EMM or EMM individual message addressed to itself (addressed to the card ID of the CAS module inserted in the receiver). It is easy to understand how many EMMs need to be processed in the grace period before requesting, but it is not limited to this. What is necessary is just to prescribe | regulate the transmission frequency of EMM or an EMM individual message, or the number of EMMs which a receiver needs to process.

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

  For example, in the implementation example of the limited reception of the receiver shown in FIG. 20, if the implicit understanding that four tuners can be installed is assumed, the receiver is addressed to itself (the CAS inserted in the receiver). After receiving EMM (to the card ID of the module), up to 24 EMM processes can be processed for the CAS module (IC card) during the grace period of 30 seconds. From 24/4 = 6, By prescribing that “a maximum of 6 EMMs are sent per 30 seconds (grace period for EMM processing) for one CAS ID per entity”, without overcoming the previous implicit matters. Normalization is possible. Of course, the number of 6 or less may be any number as long as it is an integer of 6 or less.

  This number of 6 is a case where the performance of the CAS module is estimated, 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 EMM transmission frequency or the minimum number of EMMs to be processed within the EMM processing grace period is determined in consideration of the actual performance of the CAS module, the ECM update period, 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, a terrestrial digital television broadcast defined in Non-Patent Document 3, an advanced broadband satellite broadcast, so-called 4K8K broadcast. In addition to the ECM update period and retransmission period, the number of EMMs that are sent within the time that can be suspended after receiving the EMM addressed to the CAS ID installed in the receiver addressed to one CAS ID per entity, Alternatively, by defining the minimum number of EMMs to be processed within the EMM processing grace period, exactly the same effect can be obtained. Needless to say, the package shape of the CAS module is not limited to the IC card, and the shape of the IC chip is not changed.

  FIG. 21A shows the first tuner (4K8K) 1801-1, the second tuner (4K8K) 1801-2, the third tuner (2K) 1801-3, and the 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. In the receiver 1800, the receiver receives ECM and EMM respectively at the times indicated by the arrows. After receiving the EMM 2121 from the second tuner (4K8K) 1801-2, the first tuner (4K8K) 1801-1 to ECM2110, the second tuner (4K8K) 1801-2 to ECM2120, and the first tuner (4K8K) 1801-1. To EMM2111, third tuner (2K) 1801-3 to ECM2130, fourth tuner (2K) 1801-4 to ECM2140, third tuner (2K) 1801-3 to EMM2131, fifth tuner (2K) 1801 It shows that ECM2150 is received in order from -5. The horizontal axis is a time axis.

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

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

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

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

  2102-1 represents the processing order when processing is performed for timing reception when the receiver receives ECM and EMM. In this example, the ECM 2130 that should originally finish processing within 1600 ms, which is the time from the reception timing of the ECM to the timing of receiving the broadcast signal descrambled using the scramble key (Ks) included in the ECM. , ECM 2140 and ECM 2150 are not completed.

Therefore, “4.1 (8)” described in Non-Patent Document 4.
-Regarding the EMM reception command and EMM individual message reception command, issue a command to the IC card from the receiver within 30 seconds after receiving the EMM and EMM individual message addressed to its own card. (There is a related description in this volume A-10.) "
An example in which ECM processing is prioritized according to the above and EMM processing and EMM individual message processing are delayed is 2102-2. As shown in this example, the priority of the ECM processing is increased to complete the 2K ECM processing within 2000 ms, which is the update period of the 2K ECM. However, the total processing time from EMM2121 to ECM2150 is the processing time of EMM2121 (650 ms) + the processing time of ECM2110 (600 ms) +
ECM2120 processing time (600 ms) + ECM2130 processing time (300 ms) +
ECM 2140 processing time (300 ms) + ECM 2150 processing time (300 ms) = 2750 ms
In the 2K ECM, the process of the ECM 2150 received by the receiver last in order is not completed within 2000 ms.

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

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

By giving the highest priority to the ECM processing of 2K broadcasting, the processing time of ECM of 2K broadcasting is as follows.
EMM2121 (650 ms) + ECM2130 (300 ms) + ECM2140 (300 ms) + ECM2150 (300 ms) = 1550 ms
In the 2K ECM, the process of the ECM 2150 received by the receiver last in order is completed within 2000 ms.

  FIG. 22 is a flowchart for requesting the CAS module to perform ECM and EMM processing in order to give the highest priority to the ECM processing of 2K broadcasting 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 processing request transmission processing 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 TS decoding unit 1803-2 to the CAS module 1811 in order to control the order of ECM and EMM processing requests. It manages the ECM reception buffer and the EMM reception buffer to be saved. Each buffer is prepared by the number of tuners, the ECM reception buffer has a single stage buffer, and the EMM reception buffer has a plurality of stages.

  The ECM reception buffer is a buffer for temporarily storing the ECM included in the 2K broadcast, the 4K broadcast, and the 8K broadcast. In order to distinguish between 2K and 4K8K, the buffer prepared for the 2K tuner distinguishes the 2K ECM reception buffer, and the buffer prepared for the 4K8K tuner distinguishes the 4K8K ECM buffer. The EMM reception buffer is a buffer for temporarily storing EMMs included in 2K broadcast, 4K broadcast, and 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 ECM processing of 2K broadcasting described in FIG. 22 will be described. The control unit 1806 checks the first 2K broadcast ECM reception buffer (S2201).

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

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

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

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

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

  Upon receiving the response from the CAS module 1811 in S2208, the control unit 1806 returns to the processing of S2201 again and confirms whether there is data waiting for a processing request in the 2K broadcast ECM reception buffer, the 4K8K broadcast ECM reception buffer, or 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, at least one EMM must be processed for the CAS module in 30 seconds after receiving an EMM with a card ID addressed to itself per business entity. An example in the case of performing processing in accordance with the definition of “can be ignored or discarded when received” will be shown.

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

In addition, Non-Patent Document 5 similarly relates to the EMM processing grace period of the receiver.
-Regarding the EMM reception command and EMM individual message reception command, issue a command from the receiver to the CAS module within 30 seconds after receiving the EMM and EMM individual message addressed to its own card. (There is a related description in Appendix 4.)
Is described.

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

  An EMM reception buffer and its processing flowchart when this rule is added will be described.

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

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

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

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

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

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

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

  When the elapsed time of confirmation exceeds 30 seconds (Yes in S2404), the corresponding EMM data is cleared (S2405). After clearing the data (S2405), the control unit 1806 returns to S2401 and continues the process.

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

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

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

  Furthermore, this embodiment has the EMM reception buffer shown in FIG. 23, and controls the EMM processing request in the processing flowchart as shown in FIG. 24. For example, the management of each EMM buffer waiting for processing is performed for each business entity. It is also conceivable that the reception time is judged, and if the EMM received within 30 seconds already exists in the EMM buffer, the EMM received later is discarded.

  FIG. 25 is a flowchart of the process shown in FIG. 24, in which “the reception time of the EMM buffer managed for each business entity and waiting for processing is determined, and the EMM received within 30 seconds already exists in the EMM buffer. FIG. 11 is a processing flowchart of the EMM reception of the receiver when a rule “discard 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 confirms 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 confirmation (Yes in S2501), the control unit 1806 confirms whether 30 seconds have elapsed from the reception time of the stored data (S2502).

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

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

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

  As described above, in order to examine how many tuners can be designed with one CAS module (IC card), the ECM update period, the ECM retransmission period, and the installed CAS module (IC card) In addition to the response performance of the EMM, the frequency of transmission per ID per EMM entity, or the minimum number of EMMs to be processed within the EMM processing grace period is specified on the transmission / reception system. Therefore, it is possible to study the number of tuners that can be processed with exactly one CAS module.

  In TR-B39 Vol.5 “4.9.3.1 Sending frequency of EMM section and EMM individual message section”, in order to reduce the processing burden on the receiver, EMM / EMM individual messages addressed to the same receiver are not sent in a concentrated manner. Considering this, the maximum number of EMM or EMM individual messages sent to the same receiver is 8 per 8 seconds. Is prescribed. This rule is that, in all tuners of 8K, 4K, and 2K that are installed in the EMM addressed to the CAS module ID of the receiver, there is no possibility that all EMM processing grace periods (eg 30 seconds) are transmitted simultaneously. 4K (or 8K) depending on the timing of EMM transmission by the on-board tuner, although it may be possible in the EMM processing grace period (for example: 30 seconds) after receiving EMM for 8 EMMs received in 8 seconds other than ECM processing ) Even if 8 EMMs can be received in 8 seconds in the tuner, there is a possibility that processing cannot be completed in 30 seconds after reception. Originally, 8 EMMs should be sent every 30 seconds in order to perform EMM processing without being missed by the receiver, but if the broadcaster allows it, 8 EMMs received in 8 seconds are EMMs. Even if the processing grace period (30 seconds) has passed, one EMM process is performed at least every 30 seconds without discarding, and 8 cached EMMs are processed once in the EMM grace period (example 30 seconds). Since the object of the present invention can be achieved even if processing is allowed for a period × 8 (eg, 240 seconds), there is no problem in the object and effect of the present proposal that it is defined as an exceptional case. Therefore, it is important to define rules that can be transmitted and received in consideration of the performance of the CAS module so that the receiver can perform EMM processing without losing it.

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). 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 The first key (Kw) is acquired from the first control information (EMM) using the unique third key (Km), and the first key (Kw) is acquired from the second control information (ECM). A CAS module that obtains the second key (Ks) to be given to the descrambler using one key (Kw),
The controller is
It is set that the first control information (EMM) per business entity should be processed at least R (integer of 1 or more) within the processing grace period to the CAS module after receiving the EMM specified in the regulations. After the first control information (EMM) of the one entity is detected and R processes are performed within the EMM processing grace period, the first control information (EMM) next to the one entity is detected. ) Is detected, a receiving device is provided that suppresses command transmission to the card unit for at least the first control information (EMM) within the EMM processing grace period.

As can be understood from the above description, the above-described embodiment naturally has functions as a receiver, and features as a transmitter and a transmission / reception system. Hereinafter, further important points in the above-described embodiment will be described together.
(1) The maximum number of EMM / EMM individual messages sent to the same receiver is M (see * 2 described later) per 30 (see * 1) seconds per entity.
(2) The maximum number of EMM / EMM individual messages sent to the same receiver is 30 M (see * 2 below) per entity (see * 1 below) per second, and M2 (see * 3 below) per second. (See * 2, 4 below).
(3) The maximum number of EMM / EMM individual messages sent to the same receiver is M2 (see * 2, 4 below) per 2 entities (see * 3 below).
(4) The maximum number of EMMs sent to the same receiver is 30 (see * 1 below) per entity per second (see * 2 below) per second, and 30 EMM individual messages per entity (see * 1 below). ) Maximum M3 per second (see * 2 and 5 below).
(5) The maximum number of EMMs sent to the same receiver is 30 (see * 1 below) per entity per second (see * 2 below), and 2 EMM individual messages per entity (see * 3 below). ) Maximum M3 per second (see * 2 and 5 below).
The maximum number of EMMs sent to the same receiver is M * 2 per entity (see * 3 below) per second, and the maximum number of EMM individual messages is 30 Ms per entity (see * 1 below). * See 2, 5).
* 1 ... 30 seconds is the grace period until processing is performed for CAS after receiving the EMM / EMM individual message specified in the current operational regulations.
* 2 ... The numbers of TR-B14 and B15 are the same, TR-B39 has different values,
* 3 ... 2 seconds is the operation regulation TR-B14 for the current broadcast (2K), ECM (Ks) update period for TR-B15, 8 seconds for the advanced BS / CS (4K8K) TR-B39,
* 4 ... M2 is the case where the value of M is 3 or more, etc., and when it is necessary to stipulate sending in bursts within one Ks update cycle,
* 5 ... The response time performance of CAS of EMM and EMM individual message is actually different. Although there are few operations of EMM individual messages, EMM is a draft rule that takes into account the demands of businesses that want to change the frequency.

Furthermore, various effects can be obtained by the configuration of the receiver as described below. That is,
(B1)
Receive at least first control information (EMM) including an encrypted first key (Kw), second control information (ECM) including an encrypted second key (Ks), and a service signal including scrambled content. A tuner unit, a descrambler that receives the scrambled content output from the tuner unit, a control unit that controls at least the tuner unit and the descrambler, and a control unit that controls the first control information (EMM) ) To obtain the first key (Kw) using a unique third key (Km), and from the second control information (ECM) to obtain the first key (Kw) A CAS module for obtaining the second key (Ks) for giving to the descrambler,
The controller is
It is set that the first control information (EMM) per business entity should be processed at least R (integer of 1 or more) within the processing grace period to the CAS module after receiving the EMM specified in the regulations. After the first control information (EMM) of the one entity is detected and R processes are performed within the grace period of the EMM process, the first control information next to the one entity A receiving device that, when detecting (EMM), suppresses command transmission to the card unit for at least the first control information (EMM) within the grace period.

According to the configuration of (B1) above, even if there is exactly one CAS module, the receiver (9) can enable viewing of the contracted program without missing the ECM and EMM processing necessary for descrambling. Or a transmission device or a transceiver).
(B2)
In the receiver, the control unit determines whether the tuner unit receives the first control information (EMM) when the terrestrial digital television broadcast is received and when the BS digital broadcast / broadband CS digital broadcast is received. ) Is sent on the premise that the frequency is the same, or on the premise that the number of processing obligations of the first control information (EMM) is the same, to determine the frequency or the number The first control information (EMM) is processed using the same information.

According to the configuration (B2), there is an advantage that the number of EMM frequencies (duty of processing) of TR-B 14 and TR-B 15 is the same. In other words, TR-B14 and TR-B15 are standard specifications of 2K TV for terrestrial digital, BS and 110CS, and regardless of broadcasting media (terrestrial digital, BS, 110CS) The same EMM processing frequency rule does not complicate the mounting conditions in the CAS processing. If the conditions are the same, verification is easy at the receiver development stage, and TR-B14 and B15 are the same B-CAS system when the number of transmissions is specified, and EMM transmission equipment can be shared.
(B3)
In the case where the tuner unit receives terrestrial digital television broadcast and the case where the tuner unit receives advanced broadband satellite digital broadcast,
Assuming that the frequency with which the first control information (EMM) is sent within the grace period (for example, 30 seconds) is different, or that the number of processing obligations of the first control information (EMM) is different. Based on the premise, the first control information (EMM) is processed with different information for determining the frequency or the number of pieces.

According to the configuration of (B3) above, TR-B14 is terrestrial digital and allows pay broadcasting according to the operation rules, but is substantially only free broadcasting, and the possibility of operation of EMM is extremely low. The EMM, which is different from the pay-broadcast-required TR-B39, is likely to be able to process more ECMs. By setting the frequency of the TR-B14 low, the number of terrestrial digital tuners installed Is likely to increase.
(B4)
In the case where the tuner unit receives BS digital broadcast / broadband CS digital broadcast and the case where the tuner unit receives advanced broadband satellite digital broadcast,
Assuming that the frequency with which the first control information (EMM) is sent within the grace period (for example, 30 seconds) is different, or that the number of processing obligations of the first control information (EMM) is different. As a premise, the first control information (EMM) is processed with different information for determining the frequency or the number.

According to the configuration of (B4) above, even if the command response performance of the EMM and ECM in the TR-B39 compliant CAS module is different from the command response performance of the TR-B14,15 pure IC card, the TR-B39 compliant Other EMM frequencies can be set according to the performance of the CAS module. Since TR-B39 can acquire EMM even via a communication path, the frequency setting differs from TR-B14 and TR-B15, which can only transmit EMMs using only broadcast waves. (TR-B39 is reduced), TR-B39 is intended for later digital broadcasting compared to 2K broadcasting such as TR-B14 and TR-B15, so new 4K8K paying subscribers To improve service, increase the number of EMMs sent for a certain period of time, and even if EMMs are missed at the receiver, E By performing the M reception it is possible to in a short period of time from subscription to key drilling (EMM reception). In TR-B39, it is also possible to prescribe the priority order by EMM acquisition via a communication channel and EMM acquisition via a broadcast wave. For example, to unlock a pay view immediately via a communication channel. Needless to say, raising the processing priority of EMM via communication after ECM is also effective in terms of user convenience.
(B5)
In the case where the tuner unit receives terrestrial digital television broadcast, BS digital broadcast / broadband CS digital broadcast, and 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, The first control information (EMM) is processed using the frequency or the number of pieces of determination information in common.

According to the configuration (B5) above, the processing at the receiver is simplified. The same EMM processing timing is possible regardless of the reception network (terrestrial digital, 2KBS, 2KCS, 4K8KBS, 4K110CS).
(B6)
In the first case where the tuner unit receives BS digital broadcast / broadband CS digital broadcast and the first case where the tuner unit receives 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 duties of the first control information (EMM) is the same, the frequency Alternatively, the first control information (EMM) is processed by using the number of pieces of determination information in common.
In the second case where the tuner unit is receiving digital terrestrial television broadcasting, the first control information (where the frequency or the number of pieces of information is determined differently from the first case). EMM).

According to the configuration (B6) above, the frequency with which EMMs are sent is different for TR-B14, and B15 and B39 have the same frequency. TR-B15 and TR-B39 including a pay system and terrestrial digital broadcasting (which is divided by TR-B14) without substantial pay broadcasting have advantages similar to the above (B3). Moreover, it is highly possible that the number of terrestrial digital tuners mounted can be increased by setting the frequency at TR-B 14 low.
(B7)
The tuner unit receives the first control information (EMM) corresponding to the one business entity and an EMM individual message transmitted to each receiver and indicating a pointer of an automatic display message;
Receive EMM individual message,
The control unit processes the first control information (EMM) corresponding to the one business entity and the EMM individual message separately.

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

According to the configurations of (B7) and (B8) above, the numbers of EMM frequencies (processing obligations) of EMMs and EMM individual messages are different. As a result, it is assumed that the CAS module response performance of the EMM and the EMM individual message are different from each other, the short response time and the size of the EMM individual message are predicted to be smaller than the EMM, and the response performance is assumed to be short. Therefore, it is possible to define that the frequency is higher than that of EMM. Compared to EMM, EMM individual messages are individual parts (for example, subscriber names) for each ID of EMM mail and automatic display messages, and the actual usage frequency is considered to be low, and the contract is being called. EMM or ECM processing is performed by reducing the frequency of EMM because it is difficult to request immediateness, such as checking the number of times, that is, by setting the number in a span longer than the EMM processing grace period or by reducing the number in the same processing grace period It is expected as an advantage that the time to be turned on is increased.
(B9)
The frequency of the first control information (EMM) is set according to a processing grace period of the first control information (EMM).

According to the configuration of (B9) above, the EMM frequency is determined by the EMM processing grace period. With this, the number of EMMs required at any time within the grace period is processed. It can be said that it is a useful setting method. When considering the flow of the receiver, the degree of freedom increases if it is decided in this period.
(B10)
The frequency of the first control information (EMM) is set based on an update period of the second key (Ks) of the first control information (EMM).

According to the configuration of (B10) above, the EMM frequency is determined by the Ks update cycle. The EMM processing grace period is currently 30 seconds, and the Ks update cycle is shorter. In considering the EMM filtering performance at the receiver, the provision of the number in a short time is meaningful in terms of how many EMMs may be addressed to the self in a short time. However, it is a case where a business operator issues a plurality of EMMs in a short time. In addition, issuing multiple EMMs in a short time is effective if you want to send the same EMM in a short time if you want to acquire the EMM as soon as possible. However, if only the EMM transmission rate is used, the EMM cache area increases as long as the processing grace period (30 seconds) remains, so the number of EMMs is not the transmission rate but is used to estimate the temporary EMM cache area. Is effective.
(B11)
<Determine EMM frequency by Ks update cycle>
The frequency of the first control information (EMM) is set based on a processing grace period of the first control information (EMM) and an update period of the second key (Ks) of the first control information (EMM). Being,
According to the above configuration (B11), in the configuration (B11), the EMM frequency is determined by the Ks update cycle. For example, if a receiver needs to receive one message every 30 seconds, but it wants to receive it as soon as possible, for example, “The receiver needs at least one process per entity in 30 seconds. Sending out at a rate of 2 in 2 seconds, but after receiving EMM, EMM acquired in 30 seconds can be discarded or not received. Therefore, the remaining time can be used for EMM and ECM processing of other tuners, and EMM can be received more quickly by sending more EMMs for a certain period of time, allowing viewers to confirm the contract in a shorter time. In addition, the receiver side 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.
Are also included, that is,
(C1)
On the receiving side,
Receive at least first control information (EMM) including an encrypted first key (Kw), second control information (ECM) including an encrypted second key (Ks), and a service signal including scrambled content. A tuner unit, a descrambler that receives the scrambled content output from the tuner unit, a control unit that controls at least the tuner unit and the descrambler, and a control unit that controls the first control information (EMM) ) To obtain the first key (Kw) using a unique third key (Km), and from the second control information (ECM) to obtain the first key (Kw) A CAS module (IC card) for obtaining the second key (Ks) for giving to the descrambler is provided, and a transmission facility includes the first key per business unit. 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,
Each of the transmission facilities is assumed to have the same frequency of sending the first control information (EMM), or the number of processing obligations of the first control information (EMM) is the same,
The broadcast signal transmission system according to C1, wherein the first control information (EMM) can be processed by sharing information for determining the frequency or the number on the receiving side.
(C3) In the terrestrial digital television broadcast and the advanced broadband satellite digital broadcast, the frequency of the first control information (EMM) being transmitted by each of the transmission facilities within an EMM processing grace period (30 seconds) is different, or The number of processing obligations of the first control information (EMM) is different, and the first control information (EMM) can be processed by varying the frequency or the information for determining the number on the receiving side. The broadcast signal transmission system according to C1.
(C4) In digital terrestrial television broadcasting, BS digital broadcasting / broadband CS digital broadcasting, and advanced wideband satellite digital broadcasting, each of the transmission facilities transmits the first control information (EMM) within an EMM processing grace period (30 seconds). ) Is sent, or the number of processing obligations of the first control information (EMM) is different, and the frequency or information for determining the number is different on the receiving side. The broadcast signal transmission system according to (C1), wherein the control information (EMM) can be processed.
(C5) In BS digital broadcasting / broadband CS digital broadcasting and advanced broadband satellite digital broadcasting, the transmission facilities transmit the first control information (EMM) at the same frequency, or the first control. The number of processing obligations of information (EMM) is the same, and the first control information (EMM) can be processed by making the frequency or the number of determination information common on the receiving side. The broadcast signal transmission system according to C1).
(C6) In the first case of BS digital broadcasting / broadband CS digital broadcasting and advanced wideband satellite digital broadcasting, the transmission facilities have the same frequency at which the first control information (EMM) is sent. Alternatively, the number of processing obligations of the first control information (EMM) is assumed to be the same, and the first control information (EMM) is processed using the frequency or the number determination information in common on the receiving side. In the second case of digital terrestrial television broadcasting on the receiving side, the information for determining the frequency or the number is different from the first case, and the first control information ( The broadcast signal transmission system according to (C1), wherein the EMM) can be processed.
(C7) The transmission facility transmits the first control information (EMM) corresponding to the one business entity and an EMM individual message indicating a pointer of an automatic display message transmitted for each receiver. 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 business entity and an EMM individual message indicating a pointer of an automatic display message transmitted for each receiver. Assuming that the frequencies of the first control information (EMM) and the EMM individual message corresponding to one 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 information for determination is made different so that the first control information (EMM) and the EMM individual message can be processed.
(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) Any one of the above C1 to C8, wherein the frequency of the first control information (EMM) is set based on an update period of the second key (Ks) of the first control information (EMM) The broadcast signal transmission system according to 1.
(C11) The frequency of the first control information (EMM) is determined by the processing grace period of the first control information (EMM) and the update period of the second key (Ks) of the first control information (EMM). The broadcast signal transmission system according to any one of C1 to C8, which is set based on the above.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. Furthermore, in each constituent element of the claims, even when the constituent element is expressed in a divided manner, when a plurality of constituent elements are expressed together, or when they are expressed in combination, they are within the scope of the present invention. Further, a plurality of embodiments may be combined, and an example constituted by this combination is also within the scope of the invention.

  In addition, for the sake of clarity, the drawings may be schematically represented with respect to the width, thickness, shape, etc. of each part as compared to actual aspects, but are merely examples, and The interpretation is not limited. In addition, in the present specification and each drawing, components that perform the same or similar functions as those described above with reference to the previous drawings are denoted by the same reference numerals, and repeated detailed description may be omitted as appropriate. . In addition, when the claims are expressed as control logic, when expressed as a program including instructions for causing a computer to execute, and when expressed as a computer-readable recording medium describing the instructions, the apparatus of the present invention is applied. is there. Further, the names and terms used are not limited, and other expressions are included in the present invention as long as they have substantially the same contents and the same concept.

DESCRIPTION OF SYMBOLS 100 ... Broadcast station, 101 ... Broadcast station server, 102 ... 1st security function, 103 ... 1st basic function, 120 ... Service provider apparatus, 140 ... Receiver 141, communication control unit, 142, second basic function, 143, second security function, 144, application management function, 145, API, 146, application, 160 ... Display, 162 ... HDD, 201 ... Video encoder, 306 ... Video decoder, 309 ... Analysis unit, 330 ... Control unit, 327 ... Display control unit, 328 ..Display, 329 ... Speaker,
Tuner part 501
1st tuner unit: 801-1, 901-1, 1301-1,
Second tuner unit 801-2, 901-2, 1301-2,
Third tuner unit 1301-3,
Descrambler ... 502, 802, 902, 1302
Control unit ... 506, 806, 906, 1306,
IC card 511, 811, 13111,
1st IC card ... 911-1,
Second IC card ... 911-2,
Tuner / demodulator unit 1501
First tuner section (4K8K) ... 1601-1, 1801-1,
Second tuner section (4K8K) ... 1601-2, 1801-2,
Third tuner section (4K8K) ... 1601-3, 1801-3,
Fourth tuner section (2K) 1801-4,
5th tuner section (2K) ... 1801-5,
Descrambler ... 1502, 1602,
First descrambler ... 1802-1,
Second descrambler ... 1802-2,
Control unit ... 506, 806, 906, 1306,
CAS module 1511, 1611, 18111.

Claims (11)

Receive at least first control information (EMM) including an encrypted first key (Kw), second control information (ECM) including an encrypted second key (Ks), and a service signal including scrambled content. Tuner section to
A descrambler for receiving the scrambled content output from the tuner unit;
A control unit that controls at least the tuner unit and the descrambler;
Controlled by the control unit,
The first key (Kw) is acquired from the first control information (EMM) using a unique third key (Km), and the acquired first key (KM) is acquired from the second control information (ECM). A CAS module for obtaining the second key (Ks) for giving to the descrambler using Kw),
The controller is
At least R (integer greater than or equal to 1) within the grace period (hereinafter referred to as EMM processing grace period) from when the receiver receives EMM per business entity addressed to the receiver to processing for the CAS module. After the first control information (EMM) of the one entity is detected, the next first control information (next to the one entity exceeding R pieces within the EMM processing grace period) A receiving device that suppresses command transmission to the CAS module for at least the first control information (EMM) when an EMM is detected. The controller is
When the tuner unit receives terrestrial digital television broadcast and BS digital broadcast / broadband CS 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 frequency or The receiving apparatus according to claim 1, wherein the first control information (EMM) is processed using the information for determining the number in common. The controller is
In the case where the tuner unit receives terrestrial digital television broadcast and the case where it receives advanced broadband satellite digital broadcast,
Assuming that the frequency of sending the first control information (EMM) is different within an EMM processing grace period, or assuming that the number of processing obligations of the first control information (EMM) is different, The receiving apparatus according to claim 1, wherein the first control information (EMM) is processed with different information for determining the frequency or the number. The controller is
When the tuner unit receives BS digital broadcast / broadband CS digital broadcast and when it receives advanced broadband satellite digital broadcast,
Assuming that the frequency of sending the first control information (EMM) is different within the EMM processing grace period, or assuming that the number of processing obligations of the first control information (EMM) is different. The receiving apparatus according to claim 1, wherein the first control information (EMM) is processed with different information for determining the frequency or the number. The controller is
In the case where the tuner unit receives terrestrial digital television broadcast, BS digital broadcast / broadband CS digital broadcast, and 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 frequency or The receiving apparatus according to claim 1, wherein the first control information (EMM) is processed by using the determination information of the number in common. The controller is
In the first case where the tuner unit receives BS digital broadcast / broadband CS digital broadcast and the first case of receiving advanced wideband 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 frequency or Processing the first control information (EMM) in common with the information of the determination of the number,
In the second case where the tuner unit is receiving digital terrestrial television broadcasting, the first control information (where the frequency or the number of pieces of information is determined differently from the first case). EMM),
The receiving device according to claim 1. The tuner unit is
Receiving the first control information (EMM) corresponding to the one entity and an EMM individual message transmitted to each receiver and indicating a pointer of an automatic display message;
The controller is
The first control information (EMM) corresponding to the one entity and the EMM individual message are processed separately.
The receiving device according to claim 1. The tuner unit is
Receiving the first control information (EMM) corresponding to the one entity and an EMM individual message transmitted to each receiver and indicating a pointer of an automatic display message;
The controller is
The frequency of the first control information (EMM) and the frequency of the EMM individual message on the premise that the frequencies of the first control information (EMM) and the EMM individual message corresponding to the one entity are different from each other. Processing the first control information (EMM) and the EMM individual message with different information for determining
The receiving device according to claim 1.   The receiving apparatus according to claim 1, wherein the frequency of the first control information (EMM) is set according to a processing grace period of the first control information (EMM). The frequency of the first control information (EMM) is set based on an update period of the second key (Ks) of the first control information (EMM). The receiving device described. The frequency of the first control information (EMM) is set based on the processing grace period of the first control information (EMM) and the update period of the second key (Ks) of the first control information (EMM). The receiving device according to any one of claims 1 to 8.

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