JP6510089B2 - Receiver - Google Patents

Description

  The description of the embodiments relates to a receiver for receiving a broadcast signal, but also extends to a transmitter for a broadcast signal, a transmitter / receiver for a broadcast signal, and a method of implementing the device.

  Currently, in equipment that receives terrestrial digital television broadcasts, BS digital broadcasts, and broadband CS digital broadcasts, it broadcasts at the same time, such as a function to simultaneously record two different programs (double recording function), and all channel recording functions. Equipment capable of simultaneous recording (recording) of a program to be recorded has been commercialized.

  On the other hand, these broadcasts are scrambled on most channels regardless of paid broadcasts and free broadcasts, and a CAS (Conditional Access System) module (IC card) is essential to receive and view programs. There is.

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

  The purpose of scrambling the above pay broadcast is to establish a pay broadcast business. For this purpose, at the time of shipment of the receiver, basically, all receivers will not be able to receive the broadcast program by scrambling it, and only the subscribers who have signed a contract to view pay broadcast will scramble the pay viewing program. By passing the unlocking key, the receiver can view the contracted program. As a result, a pay broadcast business has been established in which a contract program can be viewed by entering into a reception contract for payment.

  The mechanism of television broadcasting that enables only subscribers to descramble contract programs is referred to as Conditional Access System (CAS). The limited reception method is defined in Japan by digital terrestrial television broadcasting, BS digital broadcasting, and broadband CS digital broadcasting in the standard STD-B25 of ARIB (General Association of Radio Industries and Businesses), and the conceptual diagram is the standard STD. -B25 Described in Part 1, Chapter 3.

  The conditional access scheme uses a triple key scheme to allow only the subscriber to descramble the program. The triple key method uses the master key (Km) stored in the CAS module (IC card) to decrypt individual information EMM (Entitlement Management Message) sent from the broadcasting station, and uses the work key (Kw). Take out. Common information ECM (Entitlement Control Message) sent from the broadcasting station is decrypted using the work key (Kw) taken out, and a scramble key (Ks) is taken out. Using this scrambling key (Ks), the scrambled content sent from the broadcast station is descrambled.

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

  On the other hand, when BS digital broadcast was started in December 2000, ARIB TR-B15 was defined as an operation rule that defines the actual operation parameters of this broadcast. In this ARIB TR-B15, Part 1 BS digital broadcast operation regulations, 5th edition BS digital broadcast limited reception system (CAS) receiver specifications and operation regulations, the update period of the scramble key (Ks) is the analog TV up to then However, in view of the two-screen function (simultaneous viewing) that has been commercialized, and the so-called back record function of recording another channel (CH) during viewing, etc., the stipulation that the updating period is about 1 second described in standard STD-B25 On the other hand, a background is defined in which at least two different channels can be simultaneously viewed and backed up by setting the update period to 2 seconds or more.

ARIB STD-B 25 6.5 Edition Revised March 17, 2015, The Radio Industries Association of Japan "Access Control Method for Digital Broadcasting (2nd Generation) and Download Method for CAS Program Standard Specification" ARIB STD-B61 1.2 version Revised December 3, 2015, Radio Industries Association of Japan ARIB TR-B14 6.2 version revised July 6, 2016, General Incorporated Association Japan Radio Industry Association ARIB TR-B15 Version 7.1 Revised on July 6, 2016, Radio Industry Association of Japan ARIB TR-B39 1.0 version Revised on July 6, 2016, Japan Radio Industry Association

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

On the other hand, in current receivers, devices capable of simultaneously recording (recording) a plurality of programs being broadcast at a certain time, such as all channel recording functions, have been commercialized. In other words,
(1) An environment is established in which multiple tuners can be used simultaneously in the receiver. In this case, although each scramble key (Ks1 to Ksn) for a large number of tuners is required within one second or two seconds, it is examined whether the receiver can process the scramble key within a predetermined time. There is a need.
(2) Also, in the conditional access system, EMMs are transmitted for displaying / erasing 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 term of validity of pay contract, and the other is request for key clearing and automatic display message deletion immediately after the subscription application when the new subscriber subscribes with the business operator In order to respond to the problem, there may be a case where the EMM for erasure is sent immediately. At this time, assuming that the receiver loses EMM acquisition, the same EMM may be repeatedly sent in the broadcast signal within one second or two seconds. Since the control unit of the receiver can not determine whether the contents of the EMM have been updated or not, even under such an environment, reception is performed by a large number of tuners described in (1) within one or two seconds. For each scrambled video signal, it is necessary to ensure that the respective scrambling key (Ks1 to Ksn) is obtained at the receiver.

  Consideration for ensuring that this scrambling key is obtained at the receiver needs to be considered in the current rules. If the receiver fails to acquire the scramble key, there will be subscribers who can not view the subscribed program.

  So, in this embodiment, even if it is exactly one CAS module, for example, a receiver (or transmission) which can make it possible to view a contracted program without losing processing of ECM and EMM necessary for descrambling. Device or transceiver).

According to an embodiment, said first entity comprising first control information (EMM) of a first entity comprising an encrypted first key (Kw), said second entity comprising an encrypted second key (Ks) second control information (ECM) and digital terrestrial television broadcasting, including scrambled content, wherein the first entity comprising at least one of the BS digital broadcasting and broadband CS digital broadcasting receives a first service signal to be broadcast A tuner unit,
A descrambler for descrambling the scrambled content that has been outputted from the tuner section,
The tuner unit, and a control unit that controls the descrambler;
Under control of the control unit, the first key (Kw) is obtained from the first control information (EMM) of the first business entity using a unique third key (Km), and the first business A CAS module for acquiring the second key (Ks) to be provided to the descrambler using the acquired first key (Kw) from body second control information (ECM);
Equipped with
The control unit
During a predetermined number first command transmission corresponding to the first control information of the first entity received by the tuner unit (EMM) to perform relative CAS module, the first received by the tuner unit It is a receiver which performs 2nd command transmission corresponding to the 2nd control information (ECM) of 1 business entity with respect to the said CAS module .

FIG. 1 is a diagram showing an example of the overall configuration 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. As shown in FIG. FIG. 3 is a diagram showing in detail the configuration of a receiver according to an embodiment. FIG. 4A shows a conceptual diagram of a conditional access system described in Non-Patent Document 1. As shown in FIG. FIG. 4B shows a broadcast target to be descrambled using the scramble key (Ks) and the scramble key (Ks) contained therein and the ECM in the case of terrestrial digital television broadcast, BS digital broadcast, wideband CS digital broadcast It is a figure which shows the temporal relationship of a signal. FIG. 4C is a conceptual diagram of a conditional access system described in Non-Patent Document 2. FIG. 5 is a basic configuration diagram when the receiver descrambles described in Non-Patent Document 4. FIG. 6 is a process flowchart of the limited reception process performed by the receiver shown in FIG. 5 described in Non-Patent Document 1. FIG. 7 is a diagram conceptually showing the update period of the scramble key (Ks) and the processing of the ECM and the EMM. FIG. 8 is a basic configuration diagram of the receiver when descrambled the broadcast wave in the case of having two tuners, as compared to the basic configuration of the receiver in the case of having one tuner shown in FIG. FIG. 9 is a basic configuration diagram of the receiver when descrambled the broadcast wave in the case of having three tuners, as compared to the basic configuration of the receiver in the case of having two tuners shown in FIG. FIG. 10 is a diagram showing the temporal relationship of ECM, EMM, and scramble key (Ks). FIG. 11 illustrates the timing at which the transmitting side described in Non-Patent Document 4 transmits an ECM including a scrambling key (Ks) and the timing at which a video signal to be descrambled using the scrambling key (Ks) included in the ECM is transmitted. It is FIG. 12 is an explanatory diagram according to an implementation example of the conditional access of the receiver in the transmission / reception system according to the transmission rule shown in FIG. FIG. 13 is a diagram showing an embodiment in which the number of tuner units is increased to three and the recording / recording unit is further added to the basic configuration of the receiver shown in FIG. FIG. 14 is an explanatory diagram according to an implementation example of the conditional access of the receiver shown in FIG. FIG. 15 is a basic configuration diagram of the advanced BS digital broadcast and advanced wideband CS digital (hereinafter 4K8K) broadcast receiver described in Non-Patent Document 5. As shown in FIG. FIG. 16 is a basic configuration diagram of another receiver at the time of descrambling a broadcast wave in the case of having three tuner units with respect to the receiver of the basic configuration of FIG. FIG. 17 is an explanatory diagram according to an implementation example of the conditional access of the receiver shown in FIG. FIG. 18 shows another embodiment, and shows a basic configuration example of a receiver having two tuners for 4K 8K reception and three tuners for 2K reception. FIG. 19 is an explanatory diagram according to an implementation example of the conditional access of the receiver shown in FIG. FIG. 20 is an explanatory diagram according to the implementation example of the conditional access of the receiver as in FIG. FIG. 21A shows the receiver shown in FIG. 18 including a first tuner unit (4K8K) 1801-1, a second tuner unit (4K8K) 1801-2, a third tuner unit (2K) 1801-3, and a fourth tuner unit It is a figure which shows the example of the time chart which received ECM and EMM from (2K) 1801-4 and the 5th tuner part (2K) 1801-5. FIG. 21B is a diagram showing temporal transition in which the integrated CAS module in FIG. 18 performs ECM and EMM processing shown in FIG. 21A. FIG. 22 is a flowchart in which the receiver requests the CAS module to process ECM and EMM in order to give top priority to the processing of ECM of 2K broadcast described with reference to FIGS. 21A and 21B. FIG. 23 is a diagram showing an example of an EMM reception buffer having a storage area for storing the time when EMM is received. FIG. 24 is a data processing flowchart of a receiver according to an embodiment which operates according to a predetermined rule. FIG. 25 is a process flowchart shown in FIG. 24. “The management time for EMM buffer waiting for processing is determined for each entity, and the EMM received within the EMM processing grace period (30 seconds) is in the EMM buffer. Is a processing flowchart of EMM reception of the receiver in the case of adding a rule of “discarding the received EMM when already existing”.

  Embodiments will be described below with reference to the drawings.

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

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

  The first basic function 103 is a basic function of the broadcasting station 100, and encoding (also referred to as encoding) and multiplexing a video signal and an audio signal of a program to be broadcasted, the broadcast signal (the broadcast signal is It may be transmitted as a broadcast signal of any broadcast wave type, such as digital television broadcast, BS digital broadcast, broadband CS digital broadcast, advanced BS digital broadcast, advanced broadband CS digital broadcast, and the like. Therefore, the transmission signal also includes a path via satellites. In addition, the transmission signal may include a cable route.

  Also, the broadcast station 100 can add a service that simultaneously provides application functions such as BML and HTML to a program to be broadcast. In this case, the broadcast station 100 can arrange, in the transmission control signal, the first designation information indicating that the application program is added to the program to be broadcast, and can transmit 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, a program ID, a program summary, performers, a broadcast date and time, and other data are stored in advance in order to transmit the broadcast signal to the receiver.

  The first security function 102 can make settings regarding protection of contents (programs) included in the broadcast wave transmitted by the broadcast station.

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

  The application management and distribution 121 manages content 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 to be provided to the receiver 140.

  Further, the service provider device 120 responds to the request from the receiver 140 that has received the first specification information, and uses the application management / distribution 121 to store the application and content stored in the application server 122, such as the communication network such as the Internet. Through to the receiver 140.

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

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

  The second basic function 141 is connected to the peripheral device connected to the receiver 140, for example, the display 160, an HDD (Hard Disk Drive) 162 bound to the receiver 140, removable media 170, and transmission / reception of data. Also manage the

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

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

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

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

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

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

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

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

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

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

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

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

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

  Further, 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.

  Also, the data broadcast stream separated by the demultiplexer 304 is sent to the data broadcast reception processing unit 305, and reception processing is performed. The data broadcast reception processing unit 305 extracts a display signal to be displayed on the display 328 as 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 sent 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 sent display signal.

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

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

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

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

  The transmission control signal included in the control data includes the channel identification information and the program identification information of the program of the video signal being multiplexed, and the application function is further applied to the program of the multiplexed video signal. The first specification information indicating that a service to be provided simultaneously is added is included. The analysis unit 309 analyzes the received control data to extract the channel identification information, the program identification information, and the first specification information, and transmits the extraction result to the control unit 330 as needed.

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

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

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

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

  Further, the control unit 330 decrypts the ECM and EMM to the CAS module 303 in order to extract a scramble key (Ks) necessary for descrambling from the encrypted ECM and EMM sent from the analysis unit 309. Give instructions to The CAS module 303 decrypts the ECM and EMM to extract a scramble key (Ks) based on an instruction of the control unit 330. After extracting the scramble key (Ks), the CAS module 303 transmits the extracted scramble key (Ks) to the control unit 330. When receiving the scramble key (Ks) from the CAS module 303, the control unit 330 transmits the received scramble key (Ks) to the descrambler 302. When descrambler 302 receives the scramble key (Ks) from control unit 330, descrambler 302 sets the received scramble key (Ks) internally. When descrambling the scrambled broadcast signal, the descrambler 302 performs descrambling using a scramble key (Ks) stored therein.

  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 a conditional access system described in Non-Patent Document 1. As shown in FIG.

  This system is generally called a triple key system, and three keys of 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. An encryption unit 405 that encrypts the ECM using the work key 402 and an encryption unit 406 that encrypts the EMM using the master key 403 are also encryption units managed by the broadcast station 200.

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

  The broadcast station 200 generates an ECM 410 including a scramble key (Ks) and an EMM 411 including a work key (Kw) at each required timing. The broadcast station 200 multiplexes the generated ECM 410 and EMM 411 with other program content etc., scrambles it by the scrambler 400 using the scramble key (Ks) 401 sent out by the broadcast wave at that time, and broadcasts it by the broadcast wave Send.

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

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

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

  The EMM 411 is related information of a receiver identification unit (CAS module ID unit) transmitted by the broadcast station 200. The EMM 411 includes a work key (Kw) 402 used to encrypt the ECM 410. The EMM 411 is encrypted by the encryption unit 406 using the master key (Km) 403. That is, the receiver 300 is a CAS installed from among the EMMs that are related information of the receiver identification unit (CAS module ID unit) linked with the master key (Km) broadcasted by the broadcast station 200 in one-to-one correspondence. If the EMM addressed to oneself 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 decryption The extracted work key (Kw) can be extracted, and the extracted work key (Kw) can be used to decrypt the encrypted ECM and extract the scramble key (Ks) contained in the ECM.

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

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

  The receiver 300 extracts the EMM 411 addressed to itself from the information of the CAS module ID (card ID) in the non-encrypted part of the received EMM 411, and transmits the extracted EMM 411 addressed to itself to the CAS module 303. The CAS module 303 that has received the EMM 411 decrypts the EMM 411 by the decryption unit 426 using the master key (Km) 423 stored in an internally concealed state, and extracts the work key (Kw) 422. Further, the CAS module 303 decrypts the ECM 410 by the decrypting unit 425 using the extracted work key (Kw) 422, 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 internally sets the received scramble key (Ks).

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

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

  FIG. 4B shows a broadcast target to be descrambled using the scramble key (Ks) and the scramble key (Ks) contained therein and the ECM in the case of terrestrial digital television broadcast, BS digital broadcast, wideband CS digital broadcast It is a figure which shows the temporal relationship of a signal.

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

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

  As shown in FIG. 4B, the receiver 300 can receive the scramble key (Ks) included in the ECM, 1600 ms earlier than the broadcast signal to be descrambled using the scramble key (Ks). Specifically, the broadcast signal for 2000 ms from time T11 to T12 is descrambled using the scramble key Ks2. The scramble key Ks2 is placed in the ECM 2 and sent from the broadcast station 200.

  The timing when the receiver 300 receives this ECM 2 is the timing of T20 which precedes T11 by 1600 ms. As described above, by receiving the scramble key (Ks) prior to the broadcast signal to be descrambled, the receiver 300 can descramble the received broadcast signal without delay.

  In advanced BS digital broadcasting and advanced wideband CS digital broadcasting, the temporal relationship between ECM and the scramble key (Ks) contained in it and the broadcast signal to be descrambled using that scramble key (Ks) is shown in the figure. The principle is basically the same, if the update period of the scramble key (Ks) in 4B is changed from 2000 ms to 8000 ms, and the timing of preceding reception of the ECM is changed from 1600 ms to 7600 ms.

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

  In broadcasting, if the scramble key (Ks) is used for a long time because the same signal is sent to the whole receiver, the scramble method itself is a public method defined in the ministerial decree notification. It is possible to analyze Ks by the brute force etc of When such a situation occurs, the purpose of the limited reception can not 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, basic operations when the receiver 300 performs descrambling will be described.

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

  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 (Tranport Stream) decoding unit 503 (corresponding to 304 in FIG. 3), video and audio decoding 3, a display unit 505 (corresponding to 327 in FIG. 3), a control unit 506 (corresponding to 330 in FIG. 3), and a key input unit 507 (corresponding to 342 in FIG. 3). Including. The TS decoding unit 503 analyzes the descrambled broadcast signal that has been sent, sequentially extracts a transmission control signal, and transmits the transmission control signal to the control unit 506. The control unit 506 can control the tuner unit 501, the descrambler 502, and the display unit 505 based on the transmission control signal sent from the TS decoding unit 503. Further, the control unit 506 can receive a signal of an operation input from the remote control 510 via the key input unit 507. An IC card 511 (corresponding to 303 in FIG. 3) is a CAS module that can process ECM and EMM based on a command given from the control unit 506 and extract work key (Kw) and 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. 5 described in Non-Patent Document 1.

  When a specific channel (service_id) is selected by the operation of the remote control 510 by the user, the control unit 506 causes the TS decode unit to determine whether PMT (Program Map Table) of the service_id is transmitted in the currently received broadcast wave. A PAT (Program Association Table) extracted in 503 is received and judged (S601).

  As a result of the determination, if not transmitted (No in S603), the control unit 506 refers to the Network Information Table (NIT) 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 PID (Packet Identifier) of the EMM contained in the CAT (Conditional Access Table) placed in the selected broadcast wave, and receives the EMM. The control unit 506 determines the EMM addressed to itself from the received EMMs from the information of the card ID set in the non-encrypted part of the EMM. When the control unit 506 extracts the EMM addressed to itself based on the information of the card ID, the control unit 506 transmits the EMM to the IC card 511. The IC card 511 that has received the EMM from the control unit 506 decrypts the encrypted EMM using the master key (Km) held inside, extracts the work key (Kw), and stores (S611).

  Further, the control unit 506 refers to the received PAT (S 605), receives the PMT of the service_id to be selected (S 606), recognizes the ECM PID contained inside the received PMT, and receives the ECM (S 607). ). When the control unit 506 receives 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 takes out 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) internally.

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

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

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

  Next, the case where the receiver 300 includes two tuner units will be described.

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

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

  That is, in consideration of the maximum processing time, the CAS module (IC card) compliant with Non-Patent Document 1 has the ability to process ECM and EMM during updating of this one second scramble key (Ks). It is expected to be (IC card).

  In order to process a plurality of channels (plural tuners) with one non-patent document 1 compliant CAS module (IC card), a method of extending the update period of the scramble key (Ks), CAS module (IC card) The method is considered to enable processing of a plurality of ECMs and EMMs within the time of the update period of the scramble key (Ks) of 1 second by enhancing the performance of the above.

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

"A-3-2 update cycle,
The update period of ECM is described in 5.8.5 ECM update / retransmission of this document. The timing according to the processing capacity of the IC card is
・ Assume processing up to 800 ms in 1 ECM ・ Assuming that the update interval of different ECM is 1000 ms or more, receiver specifications are assumed. With the revision of this document ver1.0, the update cycle has been revised assuming the following.
-While watching BS broadcasting on the TV screen, BS back program recording can be processed with one IC card.
・ The same thing is processed with one piece as an IC card as an simultaneous display of arbitrary BS channel 2 screens.
From the above, if the update interval of the ECM is 2000 ms or more, two scrambled services can be processed by one IC card at least at the input of different TSs. "
That is, since the CAS module (IC card) based on Non-Patent Document 1 can process an update period of 1 second of the scramble key (Ks), the ECM update period is set to 2 seconds, so that at least It becomes possible to process two channels (two tuners).

  That is, by setting the update period of ECM to 2 seconds, if it is a CAS module (IC card) compliant with Non-Patent Document 1, up to 2 channels (2 tuners) are permitted according to the operation rule regardless of the command response performance. It will be done.

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

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

  State of processing of ECM and EMM when a CAS module (IC card) conforming to Non Patent Literature 4 is inserted into a receiver having two tuner units (the first tuner unit 1 and the second tuner unit) 702. Is shown. A state of processing of ECM and EMM with respect to the first tuner unit 702-1 is a state of processing of ECM and EMM with respect to the second tuner unit.

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

  FIG. 8 is a basic configuration diagram of the receiver 800 at the time of descrambling a broadcast wave in the case of having two tuner units with respect to the basic configuration of the receiver in the case of having one tuner unit shown in FIG. It is. The difference between FIG. 8 and FIG. 5 is that one tuner unit is added and the first tuner unit 801-1 and the second tuner unit 801-2 are provided, and distribution is performed to correspond to two tuner units. A point that a device 813 is added, and a point that 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 has the two tuners of the first tuner unit 801-1 and the second tuner unit 801-2 to output the program selected by one tuner unit to the monitor and at the same time other tuner units. It is possible to record a program different from the program selected in the above and outputted to the monitor, and to 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 the broadcast wave of channel 1 to be monitored is selected by the first tuner unit 801-1, and the broadcast wave of channel 2 recorded by the recording / recording unit 812 simultaneously is selected by the second tuner unit 801-2 Explain.

  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 extracts in the TS decoding unit 803 whether the PMT of service_id_1 is being transmitted in the currently received broadcast wave. Receive and judge the received PAT.

  As a result of the determination, if not transmitted, the control unit 806 controls the first tuner unit 801-1 in order to select a broadcast wave in which service_id_1 is transmitted with reference to the NIT transmitted from the TS decoding unit 503. Do.

  The control unit 806 recognizes the PID of the EMM included in the CAT arranged in the selected broadcast wave, and receives the EMM. The control unit 806 determines the EMM addressed to itself from the received EMMs 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 encrypted EMM using the master key (Km) provided therein, and extracts and stores the work key (Kw).

  The control unit 806 also refers to the received PAT, receives the PMT of service_id_1 to be tuned, recognizes the ECM PID included in the received PMT, and receives the ECM. When the control unit 806 receives 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) internally.

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

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

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

  The control unit 806 recognizes the PID of the EMM included in the CAT arranged in the selected broadcast wave, and receives the EMM. The control unit 806 determines the EMM addressed to itself from the received EMMs 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 encrypted EMM using the master key (Km) provided therein, and extracts and stores the work key (Kw).

  The control unit 806 also 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 the control unit 806 receives the ECM, the control unit 806 issues an ECM reception command to the IC card 811.

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

  The process of the IC card 811 starts the process in response to a request from the receiver. However, the exchange of data between the control unit 806 and the IC card 811 is performed in response to a request from the control unit 806 to the IC card 811, The control unit 806 can not transmit the next request to the IC card 811 until the IC card 811 returns a response to the control unit 806.

  For this reason, when the ECM is continuously received from the TS decoding unit, the control unit 806 adjusts the timing for requesting the processing of the ECM in consideration of the retransmission period of the ECM and issues the ECM reception command for requesting the processing. Do.

  Similarly, in the processing of EMM, the IC card 811 is included in the processing of EMM included in the broadcast wave selected by the first tuner unit 801-1, and in the broadcast wave selected by the second tuner unit 801-2. Since it is necessary to perform both of the processing of the EMM to be processed, the control unit 806 adjusts the timing for requesting the processing of each EMM so as not to overlap with the timing for requesting the processing of the ECM, Issue a command.

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

  The control unit 806 that has received the scramble key (Ks) transmits the received scramble key (Ks) to the descrambler 802. The descrambler 802 sets the received scramble key (Ks) internally. The descrambler 802 descrambles the broadcast wave selected by the second tuner unit 801-2 using the set scrambling 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-bound unique key) and recorded in the recording / recording unit 812.

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

  Furthermore, the receiver can be equipped with more than two tuners.

  When the receiver is equipped with three or more tuners, for example, when making it correspond to a so-called W back record function capable of simultaneously recording two different channels other than the program being viewed, ECM processing and EMM processing are complicated. Become.

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

  FIG. 9 is a basic configuration diagram of receiver 900 at the time of descrambling a broadcast wave in the case of having three tuners with respect to the basic configuration of the receiver in the case of having two tuners shown in FIG. .

  The difference from FIG. 8 in FIG. 9 is that a third tuner unit 901-3 is added, and one IC card is added and configured by a first IC card 911-1 and a second IC card 911-2. That is the point. The other 902 to 910 and 912 are identical to 802 to 810 and 812 in FIG.

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

  As a result of the determination, if not transmitted, the control unit 906 controls the first tuner unit 901-1 to select a broadcast wave in which service_id_1 is transmitted with reference to the NIT sent from the TS decoding unit 903. 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 EMMs 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 any one of the first IC card 911-1 and the second IC card 911-2 determined in advance. The first IC card 911-1 or the second IC card 911-2 having received the EMM from the control unit 906 decrypts the encrypted EMM using the master key (Km) possessed inside, and extracts the work key (Kw) Save.

  The control unit 906 also refers to the received PAT, receives the PMT of the service_id_1 to be tuned, recognizes the ECM PID included in the received PMT, and receives the ECM. When the control unit 906 receives the ECM, the control unit 906 issues an ECM reception command to either the first IC card 911-1 or the second IC card 911-2 determined in advance.

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

  When the first IC card 911-1 or the second IC card 911-2 normally takes out the scramble key (Ks), it 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 internally sets the received scramble key (Ks). The descrambler 902 descrambles the broadcast signal sent from the first tuner unit 901-1 using the set scrambling key (Ks) at the necessary timing as shown in FIG. 4B.

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

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

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

  The control unit 906 also 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 the control unit 906 receives the ECM, the control unit 906 issues an ECM reception command to the first IC card 911-1 or the second IC card 911-2 determined in advance.

  In the IC cards 911-1 and 911-2, simultaneous processing up to two channels is secured by one IC card according to the operation rule. Therefore, the first tuner unit 901-1, the second tuner unit 901-2, And the relationship between the third tuner unit 901-3 and the first IC card 911-1 and the second IC card 911-2 that are CAS modules that perform CAS processing need to be set in the setting screen of the user interface or the like 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 to be processed by the second IC card 911-2. It shall be. In this case, in order to acquire the right to view the channels A, B, and C provided as pay broadcasts with the information of the card ID of the first IC card 911-1, a subscription contract is made, and the card ID of the second IC card 911-2. For example, in the case of simultaneously recording channels A and F while watching channel C, if subscription is made to obtain the right to view channels D, E, and F provided as pay broadcasts with the following information: 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, a contract for paid broadcast is made. The channel can be associated with the first IC card 911-1 and the second IC card 911-2.

  However, when the third tuner unit 901-3 tries to process the broadcast wave of channel A, the second IC card 911-2 does not contract to view the broadcast wave of channel A, so the second IC card No. 911-2 can not extract an EMM including contract information for viewing channel A, and as a result, the broadcast wave of channel A can not 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 viewed at different times. Although it is possible to record, it is also conceivable that simultaneous processing of simultaneous recording of channels B and C is performed while watching channel A. However, as described above, as described in Non-Patent Document 4, if one IC card is in a restricted state in which simultaneous processing can only be performed on TSs of two channels (tuners), one IC There is a problem that the card can not simultaneously process three different channel TSs.

  Therefore, in the present embodiment, the following points are focused as main points.

  In the present embodiment, in the receiver equipped with a plurality of tuners for the convenience of the user, the setting of the correlating relationship between the plurality of tuners and the plurality of IC cards is as small as possible for the burden reduction and cost reduction. Make rules to enable processing by IC card (CAS module).

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

  In this embodiment, one business entity newly sets one card ID, taking into consideration ECM's retransmission cycle, update cycle, command response performance described in the specification of CAS module (IC card), etc. It defines the frequency of transmitting EMMs, or the number of EMMs that the receiver should process within a certain period per entity. That is, what is newly defined is the number of EMMs to be processed within a predetermined period, and is it specified by the number of transmissions within a predetermined period as a transmission specification or is defined by the number of processing within a fixed period as a receiver specification? Means of This makes it possible to strictly study how many tuners allow simultaneous reception processing with one CAS module (IC card). Thereby, the convenience of the receiver manufacturer can be obtained.

The summary of the main points in this embodiment can be described as follows:
(1). EMM and / or EMM individual messages sent to the same receiver (CAS module ID) per ECM entity in the broadcast using the access control method (limited reception method or content protection method), ECM retransmit period, update period Digital broadcast transmitter and receiver that specified the transmission frequency of

  (1b). A digital EMM and / or EMM individual message sent to one CAS module ID that specifies the minimum number of EMMs that need to be processed during the grace period from the reception of an EMM to the issuance of a command issued to the CAS module Broadcast transceiver.

  (2). In a broadcast that operates an access control method (limited reception method or content protection method), when receiving, watching, recording, or recording more than two at the same time, the same reception per ECM retransmit period, update period, and one business entity Transmission frequency of EMMs and / or EMM individual messages to be sent to the machine (CAS module ID) is set, and there is a grace period from the reception of EMMs and / or EMM individual messages to the receiver to the issuance of a command to the CAS module A digital broadcast receiver for controlling an EMM and / or an EMM individual message processing of each of a plurality of tuners mounted in a period from an EMM and / or an EMM individual message transmission frequency to an issue schedule to a CAS module.

  (2b). In a broadcast that operates an access control method (limited reception method or content protection method), when receiving, watching, recording, or recording more than two at the same time, the same reception per ECM retransmit period, update period, and one business entity Machine (CAS module ID) to the CAS module from the number of EMMs and / or EMM individual messages that need to be processed during the grace period from the reception of the EMM sent to the CAS module ID to the CAS module and the issuance of a command to the CAS module. Digital broadcast receiver that controls the issue schedule.

  (3). In broadcasting that operates an access control method (limited reception method or content protection method), transmission of EMM and / or EMM individual messages sent to the same receiver (CAS module ID) per entity is sent at a predetermined frequency Digital broadcast transmitter that controls to do.

  (4). Above (1). In the description above, the sending frequency of EMMs for single CAS module ID and / or EMM individual message is defined by the number of EMMs to be sent in the grace period from receiving EMM to issuing command to CAS module. Broadcast transceiver.

  (5). Above (1). A digital broadcast transmitting and receiving apparatus, wherein the sending frequency of EMM and / or EMM individual message addressed to one CAS module ID is defined by the number of EMM and / or EMM individual message to be transmitted per update cycle of ECM or scrambling key.

  (6). Above (1). In the description above, transmission frequency of EMM and / or EMM individual message addressed to one CAS ID is transmitted during grace period from issuance of EMM and / or EMM individual message to issuance of command issued to CAS module. A digital broadcast transmitting / receiving device defined by the number of EMMs and / or EMM individual messages, and the number of EMMs and / or EMM individual messages transmitted per ECM or scramble key update period.

  (7). Above (2). In the above description, the EMM sends EMMs to the CAS module in the grace period from the reception of the EMM and / or EMM specific message for the CAS module to the issuance of the command issued to the CAS module. And / or a digital broadcast receiver controlled by the number of EMM individual messages.

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

  (9). Above (2). In the description of the EMM, the control of the issuance schedule to the CAS module is performed in the grace period from the reception of the EMM for the CAS module and / or the EMM individual message to the issuance of the command to the CAS module. A digital broadcast receiver controlled by the number and the number of EMMs and / or EMM individual messages sent per ECM or scramble key update period.

  (10). Above (3). In the above description, the sending frequency of the EMM / EMM individual message sent to the same receiver, from the reception of the EMM addressed to the CAS module and / or the EMM individual message to the issuance of the command issued to the CAS module A digital broadcast transmission device controlled by the number of EMMs and / or EMM individual messages to be transmitted during a grace period.

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

  (12). Above (3). In the above description, the transmission frequency of EMMs and / or EMM individual messages to be sent to the same receiver shall be delayed from the reception of EMM / EMM individual messages addressed to the relevant CAS module to the issuance of a command issued to the CAS module. A digital broadcast transmitting apparatus controlled by the number of EMMs to be transmitted during a period, and the number of EMMs and / or EMM individual messages sent per ECM or scramble key update period.

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

  According to the conventional standard and operation specifications, the following must be considered in order to enable simultaneous processing of two different tuners in one CAS module (IC card). Therefore, when assuming a receiver with three or more tuners, in addition to the conventional standards and operation standards, commands with CAS modules (IC cards) such as ECM and EMM etc. It is necessary to understand the performance required for response.

  However, even if this CAS module (IC card) ECM and EMM command response performance, ECM transmission frequency, update period, and grace period until EMM post-processing is decided, how strictly can the tuner processing be possible? It is difficult to study in detail.

  Generally, the ECM is updated every several seconds, so even if the retransmission cycle is sent every 100 ms, priority is given to ECM processing when multiple tuners are mounted.

On the other hand, EMM is an attribute that does not require immediate processing as compared to ECM, but in some cases it may not be as immediacy as ECM, but it may require as fast processing as possible. For example,
(A) A viewer A who wants to acquire the right to view a program broadcast by a specific broadcasting station (entity) calls the customer center of the joining broadcasting station (entity) with procedures for joining and trouble handling at the time of joining Then, the channel of the broadcasting station is selected by the own receiver according to the guidance of the telephone, and the card ID number of the receiver of the viewer A is given (b) The viewer A, for example, keeps making a call The broadcast station (entity) immediately transmits the 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), It becomes possible to descramble the broadcast signal of the channel concerned (so-called key opening becomes possible)
(D) Thus, the viewer A can confirm completion of the contract procedure,
In the case of the above scenes (a) to (d), it is a reality that although the EMM processing is not as immediacy as the ECM, it may require as fast processing as possible.

  As described above, when the viewer and the viewer make a viewing contract procedure while checking the reception state of the receiver while making a phone call, it is also assumed that the receiver may miss the reception of the EMM. Therefore, it is also assumed that the broadcasting station (entity) transmits the EMM in which the same card ID is set in a burst manner for a predetermined time, on the assumption that the receiver misses the reception of the EMM.

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

  Therefore, it is desirable for the receiver to process the CAS module (IC card) with a certain period of grace after receiving the EMM. For this reason, in the ARIB standard, the EMM reception command is issued to the CAS module (IC card) after the receiver receives the EMM in addition to the response performance of the CAS module (IC card) being indicated by the CAS module provider. A grace period was prescribed to do.

  According to this rule, on the premise that EMMs are sent to the same CAS module (IC card) infrequently, there is virtually no problem as far as possible. It is also conceivable to send multiple EMMs in a short time.

  Recently, the number of tuners installed has also increased, and receivers equipped with multi-channel recording functions, and also in Advanced Part BS 5 CS Broadcasting (So-called 4K 8 K Broadcasting) CAS and Part 1 of 5 It was defined that the CAS of current broadband satellite broadcasting (so-called 2K broadcasting) could be incorporated into an integrated CAS module.

The following description is given in Appendix 7,
"Appendix 7 About the common receiver of the current broadcast and the advanced BS digital broadcast Reception of the advanced BS digital broadcast and the BS digital broadcast / wide band CS digital broadcast specified in ARIB TR-B15 or the terrestrial digital television specified in ARIB TR-B14 The following shows the rules for applying the same CAS module to the reception of BS digital broadcast / wide band CS digital broadcast and terrestrial digital television broadcast at the time of shared reception capable of receiving at least one of John Broadcasting. .

  However, if the receiver that receives the current broadband satellite broadcast (so-called 2K broadcast) has a large number of mounted tuners, or the receiver that receives the advanced broadband satellite broadcast (so-called 4K 8K broadcast) and the current broadcast (so-called 2K broadcast) It may be sufficient from now on that one CAS module (IC card) receives and processes multiple channels.

  Under such circumstances, in Non-Patent Document 5, Non-Patent Document 3 and Non-Patent Document 4, the difference in the update period of ECM (scramble key (Ks)), or advanced broadband satellite broadcasting (so-called 4K8K) and current broadcast In the case where ECM or EMM response performance differs from that of (so-called 2K), strict timing control must be considered regarding processing of ECM or EMM in the receiver.

  However, it is difficult to study timing control regarding processing of ECM and EMM in order to obtain a receiver which can cope with various broadcasting systems and which has a large number of tuners only by the definition of the current EMM.

  Therefore, in the present embodiment, by defining the transmission frequency of EMM as described in (1) to (12) above, for example, it becomes possible to set the reception processing timing of ECM and EMM strictly. The specification of the number of tuners can be determined, and unexpected problems such as EMM drop can be prevented in advance.

  In the conditional access system with a triple key structure shown in FIG. 4A, as a technical definition on the sending side, the ECM update period is 2000 ms and the retransmission period is 100 ms in addition to the stipulated contents, “EMM one CAS module ID per business entity In contrast to this, suppose that the content of the rule that “send one in 30 seconds” is newly added.

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

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

  The detail of the temporal relationship of the scramble key (ks) for descrambling the broadcast signal using the scramble key (Ks) contained in the ECM and the scramble key (Ks) contained is shown in FIG. 4B. It is street.

  FIG. 11 shows the timing when the transmitting side transmits the ECM including the scramble key (Ks) and the descrambling using the scramble key (Ks) included in the ECM described in the fifth edition of FIG. The timing at which the video signal is transmitted is illustrated. The horizontal axis is a time axis.

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

  A section of T1 + T2 is a section in which the same ECM is transmitted. A section T3 is a section in which a video signal to be descrambled using the scramble key (Ks) included in the ECM sent in the section T1 + T2 is transmitted. The ECM including the scramble key (Ks) is transmitted from the 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 conditional access of the receiver in the transmission / reception system according to the transmission rule shown in FIG. 11 is shown below.

  FIG. 12 is an implementation example of conditional access of the receiver in the 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 by Ks0 until time T11, scrambled by Ks1 from time T11 to T12, scrambled by Ks2 from time T12 to T13, and scrambled by Ks3 from time T13 to T14 Show that.

1202 is a temporal transition of the received ECM. ECM2 is shown to be a receiver at the timing of time T21, and indicates that the ECM includes scramble keys (Ks) Ks1 and Ks2 The above-mentioned receiver at time T21 while watching a program The updated ECM is received, ECM2 is received at time T21, and a command is issued to the CAS module (IC card). The CAS module (IC card) finishes the processing of the ECM during the time of the section T21 to the section T12. The CAS module (IC card) transmits the scramble key Ks2 obtained by the processing of the ECM to the receiver, and the receiver is set to the MULTI 2 descrambler and the program scrambled using Ks2 from time T12 Descramble.

  Also, when switching from another channel during the interval T22 to T13, the receiver receives the ECM 3 and issues a command to the CAS module (IC card).

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

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

  As the performance of the CAS module (IC card) installed in the receiver, for example, assuming that 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 study.

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

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

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

  Next, when the receiver receives EMM and starts processing at T23, which is the update timing of ECM, the remaining 1100 ms during interval T23 to T14, and up to two ECMs can be processed (FIG. 12). Case 3). That is, under the above premise, it can be considered that the number of tuners that can be processed by one CAS module (IC card) is up to two.

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

  13 increases the number of tuners to three and the recording / recording unit with respect to the basic configuration of the receiver shown in FIG. 5 of the fifth edition of Non-Patent Document 4 shown in FIG. It is the added block diagram.

  The difference between FIG. 13 and FIG. 5 is that two tuner units are added and the first tuner unit 1301-1, the second tuner unit 1301-2 and the third tuner unit 1301-3 are configured, and three tuners are provided. A distributor 1313 is added to correspond to the unit, and a built-in recording / recording unit 1312 is added. Otherwise, it is identical to 1302 to 1311 and 502 to 511 in FIG.

  The three tuner units may be terrestrial digital television broadcasts, BS digital broadcasts, wideband CS digital broadcasts, or tuners capable of three-wave channel selection, and any three channels may be viewed or recorded as receiver specifications.・ It shall be able to record.

  It is assumed that one IC card 1311 (CAS module) used here has response performance of ECM and EMM that can process three tuners. For example, the response performance of the IC card 1311 sets the response performance of the ECM to 300 ms and the response performance of the EMM to 500 ms. It is assumed that the receiver 1300 transmits one EMM per entity within a grace period requiring EMM processing to the IC card 1311 after EMM reception.

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

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

  In the example of FIG. 14, from the time of ECM update timing T21 including Ks2, the first tuner unit 1301-1 which is the three tuners of FIG. 13 during 1600 ms until T12 when the scramble key of broadcast content switches to Ks2. The ECM of each of the channels selected by the second tuner unit 1301-2 and the third tuner unit 1301-3 and the EMM of at least one of the channels can be processed.

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

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

  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 as to whether the PMT of the service_id is transmitted in the currently received broadcast wave. To judge.

  As a result of the determination, if not transmitted, the control unit 1306 refers to the NIT sent from the TS decoding unit 1303 to select a broadcast wave for 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 EMMs from the information of the card ID set in the non-encrypted portion of the EMM. When the control unit 1306 extracts the EMM addressed to itself based on the information of the card ID, the control unit 1306 transmits the EMM to the IC card 1311.

  The timing at which the control unit 1306 sends an EMM to the IC card 1311 is as shown in FIG. The control unit 1306 temporarily stores the received EMM until an appropriate timing for sending the EMM to the IC card 1311 is reached.

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

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

  The control unit 1306, when making a recording reservation, stores at least the service_id of the program to be reserved, the program start time (including the date and time), the end time or the broadcast continuation time from the program start, the memory area (not shown) Store in). The control unit 1306 manages the schedule for recording reservation of two different channels for which recording reservation is performed so that the program A is selected by the second tuner unit 1301-2 and the program B is selected by the third tuner unit 1301-3. Also in the program 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 in the case of the first tuner unit 1301-1.

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

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

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

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

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

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

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

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

  The control unit 1306 also refers to the PAT of the broadcast wave of the program selected by the second tuner unit, receives the PMT of the service_id_2 desired to be selected, recognizes the ECM PID contained inside the received PMT, and Receive the ECM. When the control unit 1306 receives 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 contract EMM has already been received and the work key (Kw) has been extracted.

  Since the program A is reserved for recording, the control unit reconfigures the partial TS including the video ES, audio ES, subtitle ES, etc. to be recorded, encrypts it with an encryption key unique to the receiver, etc. Are stored in the recording / recording unit 1312 of

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

  When the program A or the program B scheduled to be recorded is to be reproduced, the recorded program list is displayed on the user interface (not shown) shown on the screen, and after selecting the program to be reproduced, the control unit 1306 records · Read out from the recording unit 1312, descramble with the key unique to the receiver, and after obtaining the video / audio signal in the compressed state, decode the compressed signal in the video / audio decoding unit 1304, and monitor or speaker (not shown) Output to

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

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

  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 a transmission control signal, and transmits the transmission control signal to the control unit 1506. The control unit 1506 can control the tuner unit 1501, the descrambler 1502 and the display unit 1505 based on the transmission control signal sent from the MMT demultiplexing unit 1503. Further, the control unit 1506 can receive a signal of an operation input from the remote control 1510 via the key input unit 1507. The CAS module 1511 is a CAS module that can process ECM and EMM based on a command supplied 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 the case where there is one CAS module 1511.

  FIG. 16 is a basic configuration diagram of the receiver 1600 at the time of descrambling a broadcast wave in the case of having three tuner units with respect to the basic configuration of FIG.

  The difference between FIG. 16 and FIG. 15 is that three tuner units (first tuner unit 1601-1, second tuner unit 1601-2, and third tuner unit 1601-3) are provided. 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 1602 to 1611 are the same as 1502 to 1511 in FIG.

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

  The CAS module used here is assumed to have response performance of ECM and EMM which can process three tuners at one time.

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

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

  It is assumed that the receiver 1600 transmits one EMM per entity during a grace period requiring EMM processing to the CAS module 1611 after EMM reception.

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

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

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

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

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

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

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

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

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

  When making a recording reservation, the control unit 1606 at least the service_id of the program to be reserved, the program start time (including the date and time), the end time or the broadcast continuation time from the program start memory area (not shown) Store in The control unit 1606 performs schedule management such that the program C is selected by the second tuner unit 1601-2 and the program D is selected by the third tuner unit 1601-3 for recording reservation of two different channels for which recording is reserved. Also in the program 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 in the case of the first tuner unit 1601-1.

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

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

  When the scramble key (Ks) is properly extracted, 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 internally sets the received scramble key (Ks). The descrambler 1602 descrambles the broadcast signal sent from the tuner unit 1601-1 using the set scrambling key (Ks) at the necessary timing as shown in FIG.

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

  Scheduled recording is performed on a desired program by the user using an electronic program guide (EPG, not shown) or the like. The control unit 1606 selects the second tuner unit 1601-2 at a time slightly before the start time of the program C scheduled to be broadcast in the same time zone reserved in advance by the program schedule according to the setting contents of the recording reservation. To obtain a TLV stream. The MMT demultiplexing unit 1603 separates the asset descrambled by the descrambler 1602 through the same processing as the first tuner 1601-1, and demultiplexes the asset such as video, audio, subtitles, etc. with the receiver-specific encryption key It is encrypted and stored in the recording / recording unit 1612 such as an HDD.

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

  When playing back a program C or a program D that has been scheduled and recorded, a program list already recorded is displayed on a user interface (not shown) shown on the screen, and after selecting a program to be played back, the control unit After reading from the recording unit, descramble using the above-mentioned receiver-specific key, and obtaining the compressed audio and video asset, the compressed audio and video unit 1604 decodes the compressed signal, and the monitor or speaker (not shown) Output to

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

  The receiver configuration in FIG. 18 is based on the basic configuration of the receiver described in the fifth edition of Non-Patent Document 4 which is the 2K broadcast operation standard, FIG. 13 in which the number of mounted tuners is increased, and the non-patent which is 4K Based on the basic configuration of the receiver described in the fifth volume of the document 5, the configuration shown in FIG. 16 is additionally provided with the number of mounted tuners, and as a tuner unit for 4K 8K reception, as a tuner unit for 2K reception It is an example of basic composition of a receiver which has three.

  The CAS module 1811 shown in FIG. 18 is a CAS module for 4K 8K broadcasting conforming to the fifth edition of Non-Patent Literature 5 as described in Appendix 7 of Non-Patent Literature 5; It is a CAS module that integrates the functions of a compliant 2K broadcast IC card. An embodiment in which two 4K8K broadcast tuners and three 2K broadcast tuners are simultaneously processed using one integrated CAS module will be described.

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

  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 scramble system AES system of 4K8K broadcast, and the second descrambler 1802-2 corresponds to the scramble system MULTI2 system of 2K broadcast.

  Further, the MMT demultiplexing unit 1803-1 corresponds to the MMT-TLV multiplexing system operated by 4K8K broadcasting, and the TS decoding unit 1803-2 corresponds to the MPEG-TS multiplexing system. The video / audio decoding unit 1804-1 is an H.264 / V. 265 | HEVC, for audio coding, corresponds to MPEG-4 AAC, MPEG-4 ALS, and the like. The video / audio decoding unit 1804-2 corresponds to the MPEG-2 system operated by 2K broadcasting for video coding, and the MPEG-2 AAC system for audio coding.

  The 2K broadcast channel selection, the video and audio display, and the recording and recording are the same as in the embodiment of FIG. 13, and the 4K 8K broadcast channel selection, the video / audio display and the recording and recording are similar to the embodiment in FIG.

  Since the receiver 1800 conforms to Non-Patent Document 3, Non-Patent Document 4 and Non-Patent Document 5, the grace period until issuing a command to the CAS module 1811 after receiving the EMM for itself is set to 30 seconds or less. Do.

In addition, as a new provision on the transmission side, if "the frequency at which one entity sets one card ID within the EMM processing grace period is one in 30 seconds", or if it is newly received. As defined on the machine side, “Each entity must process EMM to the CAS module in 30 seconds after receiving EMM addressed to CAS ID of its own receiver, at least one.
The receiver may ignore or discard the received EMM more than specified. It is assumed that the provision of

  Under this operation rule, response processing time of ECM of EAM module 1811, EMM response processing time, for example 300ms response processing time of ECM in 2K broadcast, response processing time of ECM in 4K 8K broadcast 600ms, EMM 2K broadcast and 4K 8K The verification of the number of tuners that can be implemented by one CAS module and the operation related to the CAS module will be described with respect to the case of 650 ms for both broadcasts.

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

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

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

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

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

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

  As shown in FIG. 19, as described in Non-Patent Document 5, updating of the scramble key (Ks) in 4K8K broadcast is 8 seconds, and transmission of ECM including the updated Ks starts 7600 ms before updating Ks. Be done. The ECM update cycle is also 8 seconds identical to 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 in 7600 ms until the ECM is updated and the Ks of the broadcast signal is updated. In the case of an entity in which the channels selected by the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 are different as in the case described above, the first tuner unit (4K8K) takes 30 seconds. 1801-1, it is necessary that at least one, that is, two EMMs transmitted on the channel selected by 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 further, ECM and EMM require ECM to be processed more quickly. Therefore, as priority, when processing ECM in 2K broadcast, perform 3 tuners within 1600 ms after every update of ECM, then process ECM in 4K 8K broadcast, and then perform 2K broadcast or 4K 8K broadcast. It is appropriate to prioritize the processing of processing EMM in. It is verified whether processing using one CAS module 1811 is possible with prioritization of the above processing.

  As the most severe case, five tuner units (first tuner unit (4K8K) 1801-1, second tuner unit (4K8K) 1801-2, third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801 In the case where the update timings of the respective scramble keys (Ks) coincide with each other in the program received by the tuner unit (2K) 1801-5), an example will be described.

  First, processing ECMs of the third tuner unit (2K) 1801-3, the fourth tuner unit (2K) 1801-4, and the tuner unit (2K) 1801-5, which are tuner units for 2K broadcasting, from the ECM update timing T21 Start. Since the response processing time of ECM of 2K broadcast in the CAS module 1811 is 300 ms, the third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, and tuner unit (2K) 1801- of 2K broadcast. 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 of the section up to the time T12-2 of the update timing of the 2K broadcast scramble key (Ks). In this section, processing of ECM of the first tuner unit (4K8K) is performed.

  The ECM response process of the first tuner unit 1801-1 is 300 ms × 3 + 600 ms = 1500 ms assuming that there is no process margin in the receiver, and from the end of this response process to the next ECM update timing time T22 of 2K broadcast. Because it only has 500 ms, it is still short to process ECM for 4K 8K broadcast.

  Next, similarly, at the time of ECM update timing 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 After the ECM processing of (5) is performed, ECM processing of the 4K 8K broadcast tuner (second tuner unit (4K 8 K) 1801-2) is performed this time.

  Similarly, three 2K broadcast tuners (third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, tuner unit (2K) 1801-5) from the ECM update cycle T23 of the next 2K broadcast Perform ECM processing. The ECM processing of the two 4K8K tuners (the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2) has already been completed, and by the Ks update timing T12-4 of 4K8K broadcast Since there is still room, three 2K broadcast tuners (third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, tuner unit (2K) 1801 from 2K broadcast ECM update timing T13-2 After the ECM processing of (5) is performed, the EMM processing 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, and 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 point, Ks updating of 2K broadcasting is performed four times and only 8 seconds, and therefore, transition to 4s K8 Ks updating timing T12-4 is made.

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

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

  By controlling the order of the processing as described above, the first tuner section (4K8K) is updated with scramble key (Ks) update timings T11-4, T12-4, T13-4 and 8 seconds × 3 = 24 seconds for 4K8K broadcasting. EMMs of 1801-1, second tuner unit (4K8K) 1801-2, third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, and fifth tuner unit (2K) 1801-5 The processing can be performed at least one by one, and the third tuner unit (2K) 1801-3 and the fourth tuner unit (2K) 1801-4 are performed every 1600 ms from the 2K ECM update timing to the next Ks update timing. , ECM processing of the fifth tuner unit (2K) 1801-5 is performed, and 76 up to the scramble key (Ks) update from the ECM update timing of 4K 8 K broadcast. 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, and even if the Ks update periods for 2K broadcasting and 4K8K broadcasting differ, in addition to the ECM updating period and the EMM processing grace period, By defining the minimum number of EMMs required for processing per entity within the EMM processing grace period, processing timing control can be performed without losing ECM or EMM processing.

  Further, it is assumed that the ECM update period is 2000 ms and the retransmission period is 100 ms, and that “one EMM is transmitted for one ID in 30 seconds per one entity” is added.

  Under this operation rule, as the performance of the CAS module (IC card), for example, the number of installable tuners is verified in the case where the response processing time of ECM is 295 ms and the response processing time of EMM is 400 ms.

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

  It is assumed that EMM processing is started at time T21. In this case, the remaining time until time T12 excluding EMM processing time is 1600 ms-EMM processing time 400 ms = 1200 ms, and ECM processing needs to be performed at this time, so up to 4 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, processing of 15 times of updating of the scramble key (Ks) (30 seconds / 2 seconds) in 30 seconds It can be verified that it is possible to process EMMs of 4 entities within a grace period of 30 seconds with much time of response time.

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

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

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

  In the actual design, it is designed in consideration of a margin such as a time for extracting EMM and ECM at the receiver from multiplexed broadcast waves.

  The above method of defining the frequency of EMM is the number of tuners to send per CASIO (IC card) per grace period after receiving EMM addressed to the ID of the mounted CAS module (IC card) of the receiver. However, the method of defining is not limited thereto, and the transmission frequency of EMM per card ID per one business entity may be quantitatively defined.

  For example, it may be the sending frequency of EMM per card ID per one business entity per updating cycle of Ks. For example, the maximum number of EMMs transmitted from one business entity to one card ID per 2000 ms is at most two.

  Furthermore, as a definition of the transmission frequency of EMM, a combination of a transmission frequency when the transmitting side sends EMM in burst and a grace period during which processing is suspended to the CAS module after the receiving side receives EMM, for example, 1 business There is also a prescribed method in which EMMs sent from the body to one CAS ID are up to 3 per 2 seconds and up to 6 per 30 seconds.

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

  Therefore, the method of defining the frequency of EMM and EMM individual message may define EMM, a method of defining EMM individual message with the same frequency, or may define EMM and EMM individual message with another frequency. For example, the prescribed method of “the EMM / EMM individual message sent to the same receiver shall be up to two per 30 seconds per entity.” Is defined in the same frequency. The “maximum 2” numbers are not limited to this value as they are determined in view of the actual performance of the CAS module. Also, an example is shown in which the frequencies of EMM and EMM individual messages are defined individually.

"A maximum of 2 EMMs to be sent to the same receiver per 30 seconds per entity, and a maximum of 3 EMM specific messages to be sent to the same receiver per 30 seconds per entity," or EMM It is also possible to change with the width of time to send out with and the EMM individual message. “EMMs sent to the same receiver shall be up to 2 per 30 seconds per entity, and EMM individual messages sent to the same receiver shall be up to 3 per 2 seconds per entity.”
In this example, EMM is defined for 30 seconds together with the update cycle of the transmission frequency scramble key (Ks) of the EMM individual message.

  As described above, the frequency of EMM and / or EMM individual messages is necessary to determine the number of tuners and to consider the processing margin of the control unit of the receiver, etc., in a receiver equipped with more than two tuners. As for the frequency, on the other hand, the method of subscription application for the broadcaster, for example, the method of accepting by telephone as mentioned above and transmitting immediately without disconnecting the telephone, or by telephone or net without transmitting immediately. In the case where an EMM is sent out for a predetermined time (for example, within 30 minutes), it is possible to define according to the actual situation of operation.

  The above is an example in which the transmission frequency of EMM (including EMM individual message) is specified in the operation rule, but assuming that the EMM is dropped at the receiver, the same EMM may be retransmitted in a short time as an actual operation. Is assumed. Therefore, in the operation rules, there is also a method of specifying the minimum number of EMMs to be subjected to reception processing within the grace period for the CAS module after EMM reception. For example, “The number of receivers that have received EMM / EMM individual messages for the same receiver should request processing to the CAS module is at least 1 per 30 seconds per entity. This is 30 seconds. More than EMM may be discarded. ”Specifies the minimum number of receivers that should be processed in the EMM processing grace period, and the EMM addressed to the relevant receiver (CAS ID) received within the processing grace period is , It is a method that it does not matter if it discards about what exceeds regulation.

  As described above, the receiver receives an EMM or EMM individual message addressed to itself (addressed to the card ID of the CAS module inserted in the receiver) and processes the message to the CAS module (IC card) It is easy to see how many EMMs need to be processed in the grace period before requesting a business, but it is not limited to this. The transmission frequency of EMMs and EMM individual messages or the number of EMMs required to be processed by the receiver may be defined.

  In addition, in view of the demand for receivers equipped with multi-channel tuners and the demand for receivers equipped with 2K, 4K, and 8K integrally in accordance with the regulations already in operation, it is assumed that past assumptions should be made to enable strict receiver design. In order to define the sending frequency of EMMs and EMM individual messages without contradiction, it becomes possible by going through the examination process reverse to the above.

  For example, in the implementation example of the conditional access of the receiver shown in FIG. 20, the receiver is addressed to itself (the CAS inserted in the receiver, if it has been implicitly accepted that four tuners can be mounted). After receiving the EMM of the module card ID), up to 24 EMM processes can be processed during the 30 seconds grace period until the process to the CAS module (IC card), according to 24/4 = 6, By prescribing that “the maximum number of EMMs to be sent per 30 seconds (one grace period for EMM processing) per one business entity shall be six”, the previous implicit matter is not reversed. It is possible to specify. Of course, the number of 6 or less may be any number as long as it is an integer of 6 or less.

  The number 6 is a tentative calculation of the performance of the CAS module, and it is needless to say that the result may change depending on the actual performance of the CAS module. As the transmitting and receiving system, the sending frequency of EMMs or the minimum number of EMMs to be processed within the EMM processing grace period is determined in consideration of the actual state of CAS module performance and the ECM update period and the EMM processing grace period.

  In addition, this embodiment is mainly defined by non-patent document 5 which is wideband satellite broadcasting defined by non-patent document 4, terrestrial digital television broadcasting prescribed by non-patent document 3, advanced wideband satellite broadcasting, so-called 4K8K broadcasting For broadcasts, in addition to the ECM update period and retransmission period, the number of EMMs to be sent within a time that can be postponed after receiving EMMs addressed to CAS ID mounted by the receiver addressed to one CAS ID per enterprise, Or by specifying the minimum number of EMMs to be processed within the EMM processing grace period, the same effect can be obtained. Further, it goes without saying that the package shape of the CAS module is not limited to the IC card and does not change at all even in the IC chip shape.

  FIG. 21A shows the receiver shown in FIG. 18 including the first tuner (4K8K) 1801-1, the second tuner (4K8K) 1801-2, the third tuner (2K) 1801-3, and the fourth tuner (2K) 1801. -4, The example of the time chart which received ECM and EMM from the 5th tuner (2K) 1801-5 is shown. The receiver 1800 receives the ECM and EMM at the time of the arrow, respectively. After receiving the EMM 2121 from the second tuner (4K8K) 1801-2, the first tuner (4K8K) 1801-1 to ECM 2110, the second tuner (4K8K) 1801-2 to ECM 2120, and the first tuner (4K8K) 1801-1 EMM 2111 from the third tuner (2K) 1801-3 to ECM 2130, the fourth tuner (2K) 1801-4 to ECM 2140, the third tuner (2K) 1801-3 to EMM 2131, the fifth tuner (2K) 1801 5 shows that ECM 2150 is received in order from -5. The horizontal axis is a time axis.

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

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

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

  When the control unit 1806 receives the EMM 2121, FIGS. 2102-1, 2102-2, and 2102 confirm that there is no buffer with another priority, and the control unit 1806 sends the integrated CAS module 1811 FIG. 14 is a diagram in which the processing of the CAS module in the case of receiving in order of 2110, 2120, 2111, 2130, 2140, 2131, 2150 immediately after the start of processing is considered. Further, since the processing of the integrated CAS module 1881 can not be performed in parallel, other processing can not be performed during the processing time of 2160, which is the processing of 2121, for example. In this study, 2102-1, 2102-2, and 2102-3 are an example in which 2160, which is the process of 2121, is performed first in order to study under the worst condition.

  2102-1 represents the processing order when the receiver processes to receive timing when ECM and EMM are received. In this example, the ECM 2130 must originally complete the process within 1600 ms, which is the time from the reception timing of the ECM to the timing of receiving the broadcast signal to be descrambled using the scramble key (Ks) contained in the ECM. , ECM 2140 and ECM 2150 have not been completed yet.

Therefore, "4.1 (8)" described in Non-Patent Document 4.
-Regarding the EMM reception command and the EMM individual message reception command, issue a command issued from the receiver to the IC card within 30 seconds after receiving the EMM and EMM individual message addressed to the own card. (There is a related description in main part A-10.
An example in which processing of EMM and processing of an EMM individual message are delayed according to which priority is given to processing of ECM is 2102-2. As in this example, the processing of 2K ECM is completed within 2000 ms which is the updating cycle of 2K ECM by raising the priority of processing of ECM. However, the total processing time of EMM 2121 to ECM 2150 is the processing time of EMM 2121 (650 ms) + the processing time of ECM 2 110 (600 ms) +
Processing time of ECM 2120 (600 ms) + processing time of ECM 2 130 (300 ms) +
Processing time of ECM 2140 (300 ms) + processing time of ECM 2 150 (300 ms) = 2750 ms
Among the 2K ECMs, the processing of the ECM 2150 received by the receiver last in the order is not completed within 2000 ms.

  Therefore, in order to create a shared receiver described in "Shared receiver for current broadcast and advanced BS digital broadcast" in TR-B 39 Vol. 5 Appendix 7, it is necessary to devise a processing order of ECM and EMM further It becomes.

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

By giving priority to the processing of ECM of 2K broadcast, the processing time of ECM of 2K broadcast becomes as follows.
EMM 2121 (650 ms) + ECM 2130 (300 ms) + ECM 2140 (300 ms) + ECM 2150 (300 ms) = 1550 ms
Among the 2K ECMs, processing of the ECM 2150 received by the receiver last in the order is completed within 2000 ms.

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

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

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

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

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

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

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

  As a result of confirmation When there is data waiting for request transmission in the CAS card module 1811 in the 4K 8K broadcast ECM reception buffer (Yes in S2204), the control unit 1806 issues a processing request command to the CAS module, and the response Wait for (S2208).

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

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

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

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

  Next, “After receiving an EMM for which a card ID for itself is set per entity, at least one EMM must be processed to the CAS module in 30 seconds. More than one EMM should be processed. An example is shown in the case where processing is performed according to the rule of “ignore or discard when received”.

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

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

According to the present 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 per 30 seconds per entity. Over 30 seconds. EMM may be discarded. "
The rule is added.

  An EMM reception buffer in the case where this regulation is added, and a processing flowchart thereof will be described.

  In order to realize the process of discarding an EMM exceeding 30 seconds, the control unit 1806 shown in FIG. 18 needs to know the reception time when the EMM is received. Therefore, the control unit 1806 needs to have a storage area for storing the time when the EMM is received, in the EMM reception buffer provided inside.

  FIG. 23 shows an example of an EMM reception buffer having a storage area for storing the time when EMM is received. (A) is an example of a reception buffer which 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 to the CAS module is at least 1 per 30 seconds per entity. EMMs exceeding this are discarded in 30 seconds” It is a processing flowchart of a receiver at the time of adding a prescription.

  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 processing request transmission processing to request the CAS module 1811 to process the EMM (S2400).

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

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

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

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

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

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

  Since the processing of EMM is low in immediacy, for example, the control unit 1806 may control the start of the processing of FIG. 24 by polling or the like.

  Furthermore, this embodiment has the EMM reception buffer shown in FIG. 23, and when controlling the processing request of the EMM according to the processing flow chart as shown in FIG. It is also considered that the reception time is determined, and if the EMM received within 30 seconds already exists in the EMM buffer, the later received EMM is discarded.

  FIG. 25 is a flowchart of the process shown in FIG. 24. “The management time for the EMM buffer waiting for processing is determined for each entity, and the EMM received within 30 seconds already exists in the EMM buffer. It is a processing flowchart of EMM reception of a receiver at the time of adding the rule "discard EMM received later".

  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 entity of the received EMM data, and confirms whether data is stored in the storage area of the same entity in the EMM buffer (S2501).

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

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

  As a result of confirmation, if it is not within 30 seconds (No in S2502), the buffer of the same entity is cleared (S2503), the received EMM is stored in the buffer (S2504), and the processing is ended (S2505).

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

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

  In TR-B39 Vol. 5 “4.9.3.1 EMM section and sending frequency of EMM individual message section”, “EMM / EMM individual messages for the same receiver can not be sent together to reduce the processing load on the receiver” As such, EMM or EMM individual messages addressed to the same receiver shall be up to 8 per 8 seconds. It is stipulated that. This specification essentially means that all the 8K, 4K, 2K tuners equipped with EMM for the CAS module ID of the receiver are not simultaneously transmitted during EMM processing grace period (eg 30 seconds) After receiving EMM received for 8 seconds in 8 seconds other than ECM processing, it may be possible in the EMM processing grace period (for example, 30 seconds), but it is 4K (or 8K depending on the timing of EMM transmission in the onboard tuner ) Even if 8 tuners can receive 8 EMMs in 8 seconds, they may not be processed in 30 seconds after reception. Originally, 8 EMMs should be sent every 30 seconds to process EMM without being dropped by the receiver, but if the broadcaster permits, 8 EMMs received within 8 seconds will be EMMs. One EMM process is performed for at least 30 seconds without discarding even if the processing grace period (30 seconds) passes, and eight cached EMMs are processed for one EMM grace period (example 30 seconds), and grace is provided at the latest. Since the purpose of the present invention can be achieved even if processing is allowed during the period x 8 (e.g. 240 seconds), defining as an exceptional case has no problem in the purpose and effect of the present proposal. It is important to define rules that can be transmitted and received, taking into consideration the performance of the CAS module so that the receiver can perform without missing the EMM processing.

As described above, according to the present embodiment, the first control information (EMM) including at least the encrypted first key (Kw) and the second control information (ECM) including the encrypted second key (Ks) And a tuner unit for receiving a service signal including scrambled content, a descrambler for receiving the scrambled content output from the tuner unit, a control unit for controlling at least the tuner unit and the descrambler, and the control unit. The first key (Kw) is controlled using the unique third key (Km) from the first control information (EMM), and the first key (Kw) obtained from the second control information (ECM) A CAS module for obtaining the second key (Ks) to be provided to the descrambler using one key (Kw);
The control unit
Set the minimum number of R (one or more integers) pieces of the first control information (EMM) per entity within the processing grace period to the CAS module after receiving the EMM as prescribed After the first control information (EMM) of the one entity is detected, after performing R-piece processing within the EMM processing grace period, the first control information (EMM next to the one entity) is detected. A reception apparatus is provided, which suppresses command transmission to the card unit with respect to the first control information (EMM) at least within the EMM processing grace period.

It goes without saying that the above-described embodiment has a function as a receiver and a feature as a transmitter and a transmission / reception system, as can be understood from the above description. Hereinafter, additional points of the above-described embodiment will be collectively described.
(1) The maximum number of EMM / EMM individual messages to be sent to the same receiver per M entity per 30 (see * 1) seconds shall be M (see * 2 below).
(2) EMM / EMM individual messages sent to the same receiver up to M (see * 2 below) and 30 (see below * 2) per M2 (see below * 2) per 30 seconds per entity (see below * 1) * 2 See below).
(3) EMM / EMM individual messages sent to the same receiver are up to M2 (see * 2, 4 below) in 2 (see * 3 below) seconds per entity.
(4) The maximum number of EMMs to be sent to the same receiver per 30 (see * 1 below) seconds per entity shall be M (see * 2 below), and EMM individual messages will be 30 per 1 entity (see * 1 below) ) Maximum M3 per second (see * 2 and 5 below).
(5) The maximum number of EMMs to be sent to the same receiver per 30 (see * 1 below) seconds per entity shall be M (see * 2 below), and 2 for each EMM individual message (see * 3 below) ) Maximum M3 per second (see * 2, 5 below).
The maximum number of EMMs to be sent to the same receiver per 2 business units per 2 (see * 3 below) seconds will be M * 2 pieces, and EMM individual messages will be maximum M3 per 30 seconds per 1 unit (see * 1 below) * See 2, 5).
* 1 ... 30 seconds is a grace period until processing is performed to CAS after receiving EMM / EMM individual message specified in the present operation regulations,
* 2 ... The number of TR-B14 and B15 is the same, another value for TR-B39,
* 3 ... 2 seconds is the operation rule TR-B14 in current broadcast (2K), ECM (Ks) update cycle in TR-B15, advanced BS · CS (4K8K) TR-B39 8 seconds,
* 4 ... M2 is the case where the value of M is 3 or more, etc., and it is necessary to specify the case of sending in burst mode within one Ks update period,
* 5: The response time performance of EMM and EMM individual message CAS is actually different. Although the operation of EMM individual messages is small, EMM is a case where the business operator's request to change the frequency is taken into consideration.

Furthermore, various effects can be obtained as described below by the above-described configuration of the receiver. That is,
(B1)
Receive first control information (EMM) including at least an encrypted first key (Kw), second control information (ECM) including an encrypted second key (Ks), and a service signal including scrambled content A tuner unit, a descrambler for receiving the scrambled content output from the tuner unit, at least the tuner unit, a control unit for controlling the descrambler, and the control unit are controlled by the first control information (EMM And the first key (Kw) using the unique third key (Km), and using the first key (Kw) obtained from the second control information (ECM), And a CAS module for obtaining the second key (Ks) for giving to the descrambler.
The control unit
Set the minimum number of R (one or more integers) pieces of the first control information (EMM) per entity within the processing grace period to the CAS module after receiving the EMM as prescribed And after performing R processing within the grace period of EMM processing after detecting the first control information (EMM) of the one entity, the first control information following the one entity is detected. A receiver, which suppresses command transmission to the card unit with respect to the first control information (EMM) at least within the grace period when (EMM) is detected.

According to the configuration of (B1) above, even if exactly one CAS module is used, it is possible to view a contracted program without losing ECM and EMM processing required for descrambling. Or a transmitter or transceiver can be provided.
(B2)
In the receiver, the control unit controls the first control information (EMM in the case where the tuner unit is receiving terrestrial digital television broadcasting and the case where BS digital broadcasting / wideband CS digital broadcasting is being received). To determine the frequency or the number of processing obligations of the first control information (EMM) on the assumption that the frequency of the transmission of the same or the number of processing duties of the first control information (EMM) is the same. Processing the first control information (EMM) in common.

According to the configuration of (B2) above, there is an advantage that the numbers of EMM frequencies (processing duties) of the TR-B 14 and the TR-B 15 are the same. In other words, TR-B14 and TR-B15 are the standard specifications of 2K TV of 3 wave shared devices of terrestrial digital · BS · 110CS, regardless of broadcast media (digital terrestrial, BS, 110CS), per business unit If the EMM processing frequency specification is the same, the implementation conditions are not complicated in the CAS processing. Under the same conditions, when the verification is easy in the receiver development stage and the number of transmissions is specified, TR-B 14 and B 15 are the same B-CAS system, and the EMM transmission facilities can be made common.
(B3)
The control unit controls whether the tuner unit is receiving terrestrial digital television broadcasting or receiving advanced broadband satellite digital broadcasting.
Assuming that the frequency at which the first control information (EMM) is sent is different within the grace period (for example, 30 seconds), or that the number of processing duties 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.

According to the configuration of (B3) above, the TR-B 14 is terrestrial digital, and although it is possible to use pay broadcasting in terms of operation rules, it is substantially only free broadcasting and the possibility of using EMM is extremely low. There is a possibility that more EMMs can be processed by EMMs different from the pay broadcast mandatory TR-B 39, and the number of terrestrial digital tuners mounted can be set by setting the frequency of TR-B 14 low. Is likely to increase.
(B4)
The control unit is configured to receive the BS digital broadcast / wideband CS digital broadcast and the high-bandwidth satellite digital broadcast when the tuner unit receives the BS digital broadcast / wideband CS digital broadcast.
Assuming that the frequency at which the first control information (EMM) is sent is different within the grace period (for example, 30 seconds), or that the number of processing duties of the first control information (EMM) is different. Assuming that information for determining the frequency or the number is different, the first control information (EMM) is processed.

According to the configuration of (B4) above, even if the command response performance of EMM and ECM in the CAS module compliant with TR-B39 is different from the command response performance of the IC card based on TR-B14 and 15 based on TR-B39 compliant The EMM frequency can be set according to the performance of the CAS module, and in the TR-B39, since EMM can be acquired even via the communication channel, frequency setting different from TR-B14 and TR-B15 which can only transmit EMMs only for broadcast waves Because TR-B39 targets later digital broadcasts as compared to 2K broadcasts such as TR-B14 and TR-B15, it is possible for new 4K8K pay broadcast subscribers. To improve service, increase the number of EMMs sent for a certain period of time, and even if EMM is dropped 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). Moreover, in TR-B 39, it is also possible to define the priority by definition by EMM acquisition via communication channel and EMM acquisition by broadcast wave. For example, via communication channel, in order to immediately perform key opening for pay viewing. It goes without saying that raising the priority of processing EMMs via communication next to ECM is also effective in terms of user convenience.
(B5)
In the case where the tuner unit is receiving terrestrial digital television broadcast and when receiving the BS digital broadcast / wideband CS digital broadcast and when receiving the advanced broadband satellite digital broadcast, the control unit is used. The first control information (EMM) is sent on the assumption that the frequencies are the same, or on the assumption that the number of processing duties of the first control information (EMM) is the same, The first control information (EMM) is processed with the information of the determination of the frequency or the number in common.

According to the configuration of (B5) above, the processing at the receiver is simplified. The same EMM processing timing is possible regardless of the reception netowrk (ground digital, 2 KBS, 2 KCS, 4 K 8 KBS, 4 K 110 CS).
(B6)
The control unit is configured to receive the BS digital broadcast / wideband CS digital broadcast and the first case of receiving the advanced broadband satellite digital broadcast by the tuner unit.
Assuming that the frequency at which the first control information (EMM) is sent is the same, or assuming that the number of processing duties of the first control information (EMM) is the same, the frequency Or processing the first control information (EMM) with the information of the determination of the number in common.
In the second case where the tuner unit is receiving digital terrestrial television broadcasting, the first control information (the information for determining the frequency or the number is different from the first case). Process EMM).

According to the configuration of (B6) above, TR-B14 differs in the frequency of EMM being sent, and B15 and B39 have the same frequency. The TR-B15 and the TR-B39 including the pay system and the terrestrial digital without the actual pay broadcast (separated by the TR-B14) have an advantage similar to the above (B3). Further, by setting the frequency of the TR-B 14 low, there is a high possibility that the number of terrestrial digital tuners mounted can be increased.
(B7)
The tuner unit receives the first control information (EMM) corresponding to the one entity and an EMM individual message transmitted for each receiver and indicating a pointer of an automatic display message;
Receive EMM individual message,
The control unit divides and processes the first control information (EMM) corresponding to the one entity and the EMM individual message.

(B8) <Configuration in which the number of EMM frequencies (processing duties) of EMMs and EMM individual messages is different>
The tuner unit receives the first control information (EMM) corresponding to the one entity and an EMM individual message transmitted for each receiver and indicating a pointer of an automatic display message, and the control unit is configured to receive the one 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) corresponding to the EMM and the EMM individual message are different from each other. Processing the first control information (EMM) and the EMM individual message.

According to the configurations of (B7) and (B8) above, the numbers of EMM frequencies (processing duties) of EMMs and EMM individual messages are different. As a result, it is assumed that the EMM and EMM individual message CAS module response performances are sufficiently different, short response time, and the EMM individual message size is expected to be smaller than EMM, and response performance is short. Therefore, it is also possible to specify that the frequency be higher than that of EMM. Also, compared to EMM, EMM individual message is the individuality part (for example, subscriber's name etc.) for each ID of EMM mail and automatic display message, and the actual frequency of use is considered to be less. EMM and ECM processing by decreasing the frequency of EMMs, that is, by setting the number in a span longer than the EMM processing grace period, or reducing the number even in the same processing grace period, since immediacy such as confirmation to It is expected as an advantage that the time taken to
(B9)
The frequency of the first control information (EMM) is set according to the processing grace period of the first control information (EMM).

According to the configuration of the above (B9), the EMM frequency is determined by the EMM processing grace period, thereby processing the number of EMMs necessary for any time within the grace period, for the purpose of setting the grace period It can be said that it is a useful means of setting. Also in 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 cycle of the second key (Ks) of the first control information (EMM).

According to the configuration of (B10) above, the EMM frequency is determined by the Ks update cycle. The EMM processing grace period is currently 30 seconds, and the Ks update period is shorter. In the receiver, the definition of the number in a short time makes sense in terms of how much EMM addressed to oneself may come in a short time when examining the filtering performance of the EMM. However, the case is that the business operator issues multiple EMMs in a short time. In addition, issuing multiple EMMs in a short time is effective when it is desired to send the same EMM in a short time if it is desired that the receiver acquire EMMs as soon as possible. However, EMM's cache area will increase as far as the EMM's transmission grace rate (30 seconds) remains if only the EMM's transmission rate is set. The provisions of are valid.
(B11)
<Determining 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 cycle of the second key (Ks) of the first control information (EMM). Being
According to the configuration of (B11) above, in the configuration of (B11), the EMM frequency is determined by the Ks update cycle. Even if it is sufficient to receive one in 30 seconds, if you want it to be received as soon as possible, for example, "The receiver needs at least one process per entity in 30 seconds. However, the delivery of EMM is If the EMM is sent at a ratio of 2 in 2 seconds, but the EMM acquired in 30 seconds after receiving it may be discarded or not received, it is 1 in the processing grace period of 30 seconds. Because the remaining time can be spent on EMM and ECM processing of other tuners, and sending more EMMs for a fixed time enables EMM reception more quickly, allowing viewers to check contracts in a shorter time The receiver side can also estimate the amount of temporary EMM cache.

The broadcast signal transmission system described below in this embodiment other than the above-mentioned main point.
Elements of are also included, ie,
(C1)
On the receiving side
Receive first control information (EMM) including at least an encrypted first key (Kw), second control information (ECM) including an encrypted second key (Ks), and a service signal including scrambled content A tuner unit, a descrambler for receiving the scrambled content output from the tuner unit, at least the tuner unit, a control unit for controlling the descrambler, and the control unit are controlled by the first control information (EMM And the first key (Kw) using the unique third key (Km), and using the first key (Kw) obtained from the second control information (ECM), A CAS module (IC card) for acquiring the second key (Ks) to be provided to the descrambler, the transmission facility comprising 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) Terrestrial digital television broadcasting and BS digital broadcasting / wide band CS digital broadcasting
It is assumed that the frequency at which each of the transmission equipments sends the first control information (EMM) is the same, or the number of processing duties of the first control information (EMM) is the same.
The broadcast signal transmission system according to C1, wherein the information on the frequency or the number is determined on the reception side in common and the first control information (EMM) can be processed.
(C3) In terrestrial digital television broadcasting and advanced broadband satellite digital broadcasting, the frequency at which the first control information (EMM) sends out differs within the EMM processing grace period (30 seconds) in each of the transmission facilities, or The number of processing duties of the first control information (EMM) may be different, and the receiving side may process the first control information (EMM) with different information for determining the frequency or the number. The broadcast signal transmission system according to C1.
(C4) In the terrestrial digital television broadcast, the BS digital broadcast / wide band CS digital broadcast, and the advanced broadband satellite digital broadcast, each of the transmission facilities performs the first control information (EMM within 30 seconds of the EMM processing grace period). Are different from each other, or the number of processing duties of the first control information (EMM) is different, and the receiving side makes the information for determining the frequency or the number different. The broadcast signal transmission system according to (C1) above, capable of processing control information (EMM).
(C5) In the BS digital broadcast / wide band CS digital broadcast and the advanced broadband satellite digital broadcast, the respective transmission facilities send the first control information (EMM) at the same frequency, or the first control The number of processing duties of information (EMM) is assumed to be the same, and the information on determination of the frequency or the number is made common on the receiving side so that the first control information (EMM) can be processed. The broadcast signal transmission system according to C1).
(C6) In the first case of BS digital broadcast / wide band CS digital broadcast and advanced broadband satellite digital broadcast, each of the transmission facilities has the same frequency at which the first control information (EMM) is sent Or the number of processing duties of the first control information (EMM) is the same, and the receiving side processes the first control information (EMM) with the information of the frequency or the number of determinations in common. In the second case of the terrestrial digital television broadcasting on the receiving side, the first control information (the information for determining the frequency or the number is different from that in the first case). The broadcast signal transmission system according to (C1) above, capable of processing EMM).
(C7) The transmitting equipment transmits the EMM individual message indicating the pointer of the automatic display message transmitted for each receiver and the first control information (EMM) corresponding to the one entity, and the receiving side The broadcast signal transmission system according to (C1), wherein the first control information (EMM) corresponding to the one entity and the EMM individual message are separately processed.
(C8) The transmitting equipment transmits the first control information (EMM) corresponding to the one entity and an EMM individual message indicating a pointer of an automatic display message transmitted for each receiver, and the receiving side transmits the EMM specific message. 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 first control information (EMM) and the EMM individual message can be processed by changing information for determination.
(C9) The broadcast signal according to any one of C1 to C8, wherein the frequency of the first control information (EMM) is set according to a processing grace period of the first control information (EMM). Transmission system.
(C10) The frequency of the first control information (EMM) is set based on an update cycle of the second key (Ks) of the first control information (EMM). The broadcast signal transmission system according to 1.
(C11) The frequency of the first control information (EMM) is in a processing grace period of the first control information (EMM) and an update cycle of the second key (Ks) of the first control information (EMM). The broadcast signal transmission system according to any one of C1 to C8, which is set based on the above.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof. Furthermore, in each of the constituent elements in the claims, the constituent elements may be divided and expressed, or a plurality of the constituent elements may be expressed together or they may be expressed in combination, which falls within the scope of the present invention. Also, a plurality of embodiments may be combined, and an embodiment configured by this combination is also within the scope of the invention.

  In addition, the drawings may be schematically represented as to the width, thickness, shape, etc. of each portion as compared with the actual embodiment in order to clarify the description, but this is merely an example, and the present invention It does not limit the interpretation. In the specification and the drawings, components having the same or similar functions as those described above with reference to the drawings already described may be denoted by the same reference symbols, and overlapping detailed descriptions may be omitted as appropriate. . When the claims are expressed as control logic, they are expressed as a program including an instruction that causes a computer to execute, and even when they are expressed as a computer-readable recording medium in which the instructions are described, the apparatus of the present invention is applied. is there. In addition, the names and terms used are not limited, and other expressions are included in the present invention as long as they have substantially the same contents and the same purpose.

100: broadcast station, 101: broadcast station server, 102: first security function, 103: first basic function, 120: service provider device, 140: receiver , 141: communication control unit, 142: second basic function, 143: second security function, 144: application management function, 145: API, 146: application, 160 ... indicator, 162 ... HDD, 201 ... video encoder, 306 ... video decoder, 309 ... analysis unit, 330 ... control unit, 327 ... display control unit, 328 · · · · · Display, 329 · · · Speaker,
Tuner unit ... 501,
First tuner unit ... 801-1, 901-1, 1301-1,
Second tuner unit ... 801-2, 901-2, 1301-2,
Third tuner unit ... 1301-3,
Descrambler ... 502, 802, 902, 1302,
Control part ... 506, 806, 906, 1306,
IC card ... 511, 811, 13111,
First IC card ... 911-1,
Second IC card ... 911-2
Tuner, demodulation unit ... 1501,
First tuner unit (4K8K) ... 1601-1, 1801-1,
Second tuner unit (4K8K) ... 1601-2, 1801-2,
Third tuner unit (4K8K) ... 1601-3, 1801-3,
Fourth tuner unit (2K) ... 1801-4,
Fifth tuner unit (2K) ... 1801-5,
Descrambler ... 1502, 1602,
First descrambler ... 1802-1,
Second descrambler ... 1802-2,
Control part ... 506, 806, 906, 1306,
CAS modules ... 1511, 1611, 18111.

Claims (25)

First control information of the first entity comprising a first key that is encrypted (Kw) (EMM), the second control information of the first entity comprising a second key encrypted (Ks) ( A tuner unit for receiving a first service signal broadcasted by the first entity including at least one of terrestrial digital television broadcast including ECM and scrambled content, BS digital broadcast, and broadband CS digital broadcast;
A descrambler for descrambling the scrambled content that has been outputted from the tuner section,
The tuner unit, and a control unit that controls the descrambler;
Under control of the control unit, the first key (Kw) is obtained from the first control information (EMM) of the first business entity using a unique third key (Km), and the first business A CAS module for acquiring the second key (Ks) to be provided to the descrambler using the acquired first key (Kw) from body second control information (ECM);
Equipped with
The control unit
During a predetermined number first command transmission corresponding to the first control information of the first entity received by the tuner unit (EMM) to perform relative CAS module, the first received by the tuner unit A receiver for transmitting a second command corresponding to second control information (ECM) of a business entity to the CAS module . Further has a second buffer for inputting the first second control information of the first control information (EMM) said first entity a first buffer for inputting the entity (ECM),
The control unit is configured to input, to the first buffer, the first control information (EMM) of the first entity received by the tuner unit until the first command is transmitted to the CAS module. The second command transmission corresponding to the second control information (ECM) of the first entity input to the second buffer in the meantime, is performed before the first command transmission to the CAS module The receiver according to claim 1. The control unit performs the first command transmission to the CAS module when the second control information (ECM) of the first entity is not input to the second buffer. Receiving device as described. The tuner unit controls the first control information of the nth entity (EMM from the first service signal including the first control information (EMM) of the first entity broadcasted by the first entity. N) service signals up to the nth service signal including
The first buffer includes n kinds of first control information (EMM) of first control information (EMM) of an nth entity from first control information (EMM) of the first entity by the control unit. The receiving device according to claim 2, having a size greater than n for input . The control unit transmits the first command to the CAS module within a predetermined time after the first control information (EMM) of the first entity received by the tuner unit is input to the first buffer. The receiving device according to claim 2, which performs transmission. The control unit transmits the first control information (EMM) of the first business entity received by the tuner unit to the first buffer and then the predetermined time has elapsed from the CAS module. The receiving device according to claim 5, wherein the first command transmission is suppressed. When the control unit inputs the first control information (EMM) of the first entity received by the tuner unit to the first buffer, the control unit causes the first buffer to receive the first control information of the first entity . The receiving device according to claim 2, wherein the first control information (EMM) of the first entity received by the tuner unit is input when control information (EMM) is not input. Wherein, when inputting the first control information of the first entity, wherein the tuner unit receives (EMM) to the first buffer, already the first beyond said predetermined time to said first buffer when one of the first control information entity (EMM) is input, the first control information of the first entity being input exceeds the predetermined time (EMM), said first delete from the first buffer if the type of the tuner unit receives the first control information of the first entity (EMM), or the first buffer is not be input from the deleted from the buffer The receiving device according to claim 5, wherein the first control information (EMM) of the first entity received by the tuner unit is input. The control unit, when inputting the first control information (EMM) of the first entity received by the tuner unit, to the first buffer, the control unit exceeds the predetermined time in the first buffer and the first control information is received . The first control information (EMM) of an entity of is input, and if the first buffer can be input, the first entity of the first entity being input beyond the predetermined time The receiving device according to claim 5, wherein the first control information (EMM) of the first entity received by the tuner unit is additionally input in addition to the first control information (EMM).   10. The receiving device according to claim 5, wherein the control unit sets the predetermined time to 30 seconds. A plurality of the tuner units are mounted,
The tuner unit can receive a plurality of service signals including the first service signal at any timing,
The control unit inputs the first control information (EMM) of the first entity included in the first service signal received by the tuner unit into the first buffer and then transmits the first command . The second command transmission corresponding to the second control information (ECM) of the first entity received by the plurality of tuner units input to the second buffer until the CAS module is performed , The receiving apparatus according to claim 2, wherein the receiving apparatus performs the first command transmission to the CAS module . Wherein, said after receiving the first control information of the first entity (EMM), at least once in response to the first control information of the first entity within 30 seconds (EMM) said The receiving device according to claim 1, wherein the first command transmission is performed to the CAS module . First control information of the first entity comprising a first key that is encrypted (Kw) (EMM), the second control information of the first entity comprising a second key encrypted (Ks) ( ECM), at least one of terrestrial digital television broadcasting, BS digital broadcasting and broadband CS digital broadcasting including scrambled content and third control information (EMM individual message) of the first entity including a code of a message to be sent to an individual Tuner unit for receiving a first service signal broadcasted by the first business entity including
A descrambler for descrambling the scrambled content that has been outputted from the tuner section,
The tuner unit, and a control unit that controls the descrambler;
Under control of the control unit, the first key (Kw) is obtained from the first control information (EMM) of the first business entity using a unique third key (Km), and the first business A CAS module for acquiring the second key (Ks) to be provided to the descrambler using the acquired first key (Kw) from body second control information (ECM);
Equipped with
The control unit
The first command transmission corresponding to the first control information (EMM) of the first entity received by the tuner unit and the third control information (EMM individual message) of the first entity during the third command transmission of the predetermined speed to make to the CAS module, the second command transmission corresponding to the second control information of the first entity received by the tuner unit (ECM) CAS Receiver for the module . Furthermore the first entity first control information a second buffer and said first entity to enter the second control information of the first buffer for inputting (EMM) first entity (ECM) of And a third buffer for inputting third control information (EMM individual message),
The control unit transmits, to the first buffer, first control information (EMM) of the first entity received by the tuner unit, and third control information (EMM individual message) of the first entity . Second control information of the first entity (in the second buffer) which has been input in the third buffer and before the transmission of the first command and the third command to the CAS module. The receiving device according to claim 13, wherein the second command transmission corresponding to the ECM) is performed before the first command transmission and the third command transmission to the CAS module . The control unit transmits the first command and the third command to the CAS module when the second control information (ECM) of the first entity is not input to the second buffer. The receiving device according to claim 14, wherein The tuner unit generates third control information of an nth entity from a first service signal including third control information (EMM individual message) of the first entity broadcasted by the first entity. N service signals can be received up to the nth service signal including (EMM individual message),
The third buffer, the third control of the n different third control information of the by pre-Symbol controller first entity third control information entities of the n from (EMM individual message) (EMM individual message) The receiver according to claim 14, which has a size larger than n in order to input information (EMM individual message) . The control unit transmits, to the first buffer, first control information (EMM) of the first entity received by the tuner unit, and third control information (EMM individual message) of the first entity . The receiving device according to claim 14, wherein the first command transmission and the third command transmission are performed to the CAS module within a predetermined time after being input to the third buffer. The control unit transmits, to the first buffer, first control information (EMM) of the first entity received by the tuner unit, and third control information (EMM individual message) of the first entity . 18. The receiving device according to claim 17, wherein the first command transmission and the third command transmission are suppressed to the CAS module when the predetermined time is exceeded after being input to the third buffer. The control unit, when inputting the third control information (EMM individual message) of the first entity received by the tuner unit to the third buffer, the third buffer of the first entity The reception according to claim 14, wherein the third control information (EMM individual message) of the first entity received by the tuner unit is input when the third control information (EMM individual message) is not input. apparatus. When the third control information (EMM individual message) of the first entity received by the tuner unit is input to the third buffer, the control unit has already exceeded the predetermined time in the third buffer. wherein when the third control information of the first entity (EMM individual message) is input, the third control information (EMM individual message of the first entity being input exceeds a predetermined time ), said third type the third control information from the deleted from the buffer of the first entity, wherein the tuner unit receives (EMM individual message), or wherein when the third buffer is not ready for input The receiver according to claim 17, wherein the third control information (EMM individual message) of the first entity received by the tuner unit after deletion from the third buffer is input. When the third control information (EMM individual message) of the first entity received by the tuner unit is input to the third buffer, the control unit exceeds the predetermined time in the third buffer. The third control information (EMM individual message) of the first entity is input, and when the third buffer can be input , the first input is performed after the predetermined time . in addition to the third control information entities (EMM individual message), enter additional third control information of the first entity, wherein the tuner unit receives (EMM individual message), according to claim 17 Receiving device. Wherein, the receiving apparatus according to claim 17, the predetermined time is 30 seconds, according to claim 18, claim 20 or claim 21. A plurality of the tuner units are mounted,
The tuner unit can receive a plurality of service signals including the first service signal at any timing,
The control unit is configured to set first control information (EMM) of the first entity included in the first service signal received by the tuner unit to the first buffer and the first control information of the first entity. 3) A plurality of pieces of control information (EMM individual message) input to the third buffer, and a plurality of input to the second buffer from the time when the first command transmission and the third command transmission are performed to the CAS module The transmission of the second command corresponding to the second control information (ECM) of the first entity received by the tuner unit is performed before the transmission of the first command and the transmission of the third command to the CAS module. The receiving device according to claim 14, wherein Wherein, after receiving the third control information of the first entity (EMM individual message), in response to the third control information of the first entity within 30 seconds (EMM individual message) at least The receiving device according to claim 13, wherein the third command transmission is performed to the CAS module once . Further, the second control information of the first first control information entities (EMM) and the first third control information entities (EMM individual message) the first buffer for inputting a first entity Have a second buffer to input (ECM),
The control unit inputs, to the first buffer, the first control information (EMM) of the first entity and the third control information (EMM individual message) of the first entity received by the tuner unit. The second control information of the first entity which is input to the second buffer between the time when the first command transmission and the third command transmission are performed to the CAS module after that The receiving device according to claim 13, wherein the second command transmission corresponding to the ECM) is performed before the first command transmission and the third command transmission to the CAS module .

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