JP2020129847A - Receiving method - Google Patents

Abstract

To provide a receiving method that enables viewing of a contract program, without missing processing of ECM and EMM required for descrambling, according to the present embodiment.SOLUTION: According to the embodiment, there are included a tuner unit, a descrambler, a CAS module, and a control unit configured to control them. The control unit sets 30 seconds as a first time period longer than a first cycle as a time period from receiving of the EMM as a unit of a first business entity to transmitting of a first command corresponding to the EMM with respect to the CAS module, and sets that R (an integer greater than or equal to 1) EMMs at minimum should be processed during the first time period. The control unit transmits a second command corresponding to the ECM of the first business entity received by the tuner unit with respect to the CAS module during the first time period, and processes R (an integer greater than or equal to 1) EMMs at minimum during the first time period by transmitting a predetermined number of the first commands corresponding to the EMM with respect to the CAS module during the rest of the time other than time for the processing associated with the transmission of the second command in the first time period.SELECTED DRAWING: Figure 25

Description

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

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

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

The history of this scramble will be described. At the time when BS digital broadcasting started on December 1, 2000, only pay broadcasting was scrambled.
HK) and free commercial broadcasts were non-scrambled broadcasts.

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

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

Conditional access is limited to 3 to allow only subscribers to descramble the program.
Use the double key method. In the triple key system, the master key (Km) stored in the CAS module (IC card) is used, and the individual information EMM (Entitym) sent from the broadcasting station is sent.
ent Management Message) and the work key (Kw) is extracted. Using the extracted work key (Kw), common information ECM (En
The title control message is decrypted and the scramble key (K
s) is taken out. This scramble key (Ks) is used to descramble the scrambled content sent from the broadcasting station.

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

On the other hand, when the BS digital broadcasting was started in December 2000, ARIB TR-B15 was defined as an operating regulation that regulates actual operating parameters of this broadcasting. According to the ARIB TR-B15 Part 1 BS digital broadcasting operation regulations, the fifth edition BS digital broadcasting conditional access system (CAS) receiver specifications and operation regulations, the update cycle of the scramble key (Ks) is the analog television up to that time. However, in view of the dual-screen function (simultaneous viewing) that was commercialized and the so-called back-recording function that records another channel (CH) during viewing, the standard STD
-In contrast to the rule that the update cycle is about 1 second described in B25, the background is specified so that at least two different channels can be viewed or backed up at the same time if the update cycle is 2 seconds or more. ing.

"Access Control Standards for Digital Broadcasting" ARIB STD-B25 6.5 version Revised March 17, 2015, General Incorporated Association ARIB STD-B61 1.2 version Revised December 3, 2015, Access Control System (2nd Generation) and CAS Program Download System Standards for Digital Broadcasting, Japan Association of Radio Industries and Businesses ARIB TR-B14 Version 6.2 Revised on July 6, 2016, Japan Radio Industry Association "BS/Broadband CS Digital Broadcasting Operation Regulations Technical Data" ARIB TR-B15 7.1 version Revised July 6, 2016, General Incorporated Association "Advanced Broadband Satellite Digital Broadcasting Operation Regulations Technical Data" ARIB TR-B39 1.0 version Revised July 6, 2016, General Incorporated Association

In order to descramble the contract broadcast program, the scramble key (Ks) is used as described above.
In order to obtain this scramble key (Ks) (update cycle 2 seconds), the work key (Kw) can be used to decrypt the ECM (update cycle 2 seconds) containing the scramble key (Ks). It is necessary and in order to obtain the work key (Kw), the master key (
It is necessary to use Km) to decrypt the EMM containing the work key (Kw) (eg sent once a day).

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

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

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

According to the embodiment, the first tuner unit receives the first service signal transmitted by the first terrestrial digital broadcasting entity, and determines the first scrambled content included in the first service signal, the predetermined scrambled content. 1a control information (EMM) of the first business entity including an encrypted 1a key (Kw) transmitted at a frequency of, and updated at a first cycle and shorter than the first cycle and predetermined. Receiving second a control information (ECM) of the first entity including an encrypted second a key (Ks) transmitted in a second cycle less than the frequency of
A second tuner unit receives a second service signal transmitted by a second terrestrial digital broadcasting entity, and transmits the second scrambled content included in the second service signal at a predetermined frequency. 1b control information (EMM) of the 1st business entity including an encrypted 1b key (Kw), 4th updated at a 3rd cycle and shorter than said 3rd cycle and smaller than a predetermined frequency Receiving second b control information (ECM) of the second entity including an encrypted second b key (Ks) transmitted at a period of
A descrambler descrambles the first scrambled content output from the first tuner unit,
A descrambler descrambles the second scrambled content output from the second tuner unit,
The control unit checks a predetermined table of the first content and the second content output from the descrambler,
Based on the packet ID included in the predetermined table, the 1a control information (EMM), the 2a control information (ECM), the 1b control information (EMM), the 2b control information (ECM). Controlling the first tuner unit, the second tuner unit, and the descrambler,
The CAS module is controlled by the control unit, and obtains the 1a key (Kw) from the 1a control information (EMM) of the 1st entity using a unique 3rd key (Km), Obtaining the second a key (Ks) for giving to the descrambler from the second a control information (ECM) of the first business entity, using the obtained first a key (Kw);
The CAS module is controlled by the control unit, and obtains the 1b key (Kw) from the 1b control information (EMM) of the second entity using a unique 3rd key (Km). , Obtaining the second b key (Ks) to be given to the descrambler using the obtained first b key (Kw) from the second b control information (ECM) of the first entity. ,,
Further, the control unit is
The 1a control information (EMM) of the first business entity, the 2a control information (ECM) of the first business entity, the 1b control information (EMM) of the second business entity, the Store the second b control information (ECM) of the second entity in a buffer,
The first command transmission corresponding to the 1a control information (EMM) is performed to the CAS module after receiving the 1a control information (EMM) in units of the first terrestrial digital broadcasting entity. A first period that is longer than the first cycle is set as the period, and it is set that at least Ra (integer of 1 or more) pieces of the 1a control information (EMM) are to be processed in the first period. Then
Performing a second command transmission to the CAS module corresponding to the second a control information (ECM) of the first business entity received by the first tuner unit and stored in the buffer during the first period. , A predetermined number of first command transmissions corresponding to the 1a control information (EMM) stored in the buffer to the CAS module at an excessive time other than the processing associated with the second command transmission in the first period. By performing the above, the minimum Ra (integer of 1 or more) pieces of the 1a control information (EMM) are processed in the first period,
The first command transmission corresponding to the 1b control information (EMM) is performed to the CAS module after receiving the 1b control information (EMM) in units of the second business entity of the terrestrial digital broadcasting. A second period longer than the third cycle is set as the period, and it is set that at least Rb (integer of 1 or more) pieces of the 1b control information (EMM) should be processed in the second period. Then
A second command transmission corresponding to the second b control information (ECM) of the second entity received by the second tuner unit and stored in the buffer during the second period is performed to the CAS module. , A predetermined number of first command transmissions corresponding to the first b control information (EMM) stored in the buffer to the CAS module at an excessive time other than the processing associated with the second command transmission in the second period. By performing the above, at least Ra (integer of 1 or more) pieces of the first b control information (EMM) are processed in the second period,
The second a key (Ks) updated in the first cycle is acquired, and the first scrambled content is descrambled by the descrambler and displayed.
The second b key (Ks) updated in the third cycle is acquired, and the first scrambled content is descrambled by the descrambler and displayed.
Discarding or suppressing the 1a control information (EMM) remaining in the buffer after the first period has elapsed since the 1a control information (EMM) of the 1st business entity was stored in the buffer. Then
Discarding or suppressing the 1b control information (EMM) remaining in the buffer after the second period has elapsed after storing the 1b control information (EMM) of the second entity in the buffer. A reception method is provided.

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

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

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

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

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

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

The broadcast station server 101 is an area in which metadata such as program titles, program IDs, program outlines, performers, broadcast dates and other data are stored in advance in order to be transmitted to a receiver by a broadcast signal.

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

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

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

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

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

The receiver 140 includes a digital broadcast receiving function (second basic function 141) and a communication control unit 14.
2, a second security function 143, an application management function 144, an API (API: Application Programming Interface) 145, an application 146, and the control unit 1.
Including 47, it receives a broadcast signal broadcast from the broadcast station 100 to receive various broadcast programs and various service information, and acquires an application from the service provider apparatus 120 via a communication network to operate it. be able to.

The second basic function 141 is a basic function of the receiver, receives a broadcast wave sent from the broadcast station 100, and encodes a video signal (also called a video stream) included in the broadcast wave.
, And has a function of separating control signals such as encoded audio signals (also called 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 a peripheral device connected to the receiver 140, for example, the display 160, and an HDD (Hard Disk Drive) 16 bound to the receiver 140.
2. It also manages connection with the removable media 170 and data transmission/reception.

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

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

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

FIG. 2 is a diagram schematically showing a main configuration of the broadcasting station 200 (corresponding to 100 in FIG. 1).
The broadcasting station 200 has a video encoder 201, an audio encoder 202, and a caption encoder 203.
, And ancillary data generation unit 204 that generates ancillary data including control data such as transmission control signals, service data, and application control information that controls the application 145 operating in the receiver 140. In addition, the broadcasting station 200 includes a broadcasting station server 211 (see FIG.
No. 101), the first security function 212 (corresponding to 102 in FIG. 1), and the transmission/reception unit 213 cooperate with each other. Video encoder 201, audio encoder 202, subtitle encoder 203, attached data generation unit 204, multiplexing unit 205, scrambler 206, transmitter 20
7. The transmitter/receiver 213 is collectively referred to as a first basic function 210 (corresponding to 103 in FIG. 1).

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

In addition, the multiplexing system is a multiplexing system of MPEG-2 Systems or MMT (Mpeg
Media Transport) may be used, or both may be mixed and used. Further, the multiplexing method is not limited to this.

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

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

FIG. 3 is a diagram showing a detailed configuration of the receiver 300 (corresponding to 140 in FIG. 1) according to the embodiment. The receiver 300 has a second basic function 315 (corresponding to 141 in FIG. 1) that is a reception function for 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 30.
6, audio decoder 307, subtitle decoder 308, analysis unit 309, data broadcasting engine 31
Including 0.

The broadcast tuner 301 demodulates a stream (broadcast signal) sent by a broadcast wave. The demodulated stream (broadcast signal) is input to the descrambler 302. The descrambler 302 processes the input stream by using CAS (Conditional Access S).
system) descramble using the key from the module 303. Descrambler 3
The stream descrambled by 02 is input to the demultiplexer 304.

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

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

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

Further, the data broadcast stream separated by the demultiplexer 304 is sent to the data broadcast reception processing unit 305, and reception processing is performed. The data broadcast reception processing unit 305 uses the data broadcast stream sent from the demultiplexer 304 to display the data as a data broadcast on the display 32.
The display signal to be displayed on 8 is taken out, and the taken out display signal is sent to the data broadcasting engine 3
Enter in 10. The data broadcasting engine 310 analyzes the transmitted display signal and outputs the analyzed content via the synthesizer 326 to the display control unit 327. The display control unit 327 displays the display content on the display device 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 displayed on the display controller 327.
Is output to the display device 328 via. The display control unit 327 performs gamma characteristic setting, display screen size setting, display signal level setting, and the like.

The audio data decoded by the audio decoder 307 is the speaker 329 (16 in FIG. 1).
(Corresponding to 1) is output.

Note that FIG. 3A describes the display 328 and the speaker 329 as an example incorporated in the receiver 300, but an external display and speaker connected by an I/F such as HDMI may be used, for example. Good. In the display control unit 327, the display 328 is displayed on the receiver 300 by the HDM.
Even in the case of an external display device connected by an I/F such as I, the content displayed on the display device 328 is controlled.

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

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

Further, the receiver 300 has a control unit 330 as a means for controlling the overall operation. The control unit 330 controls the second security function 322 (corresponding to 143 in FIG. 1), the application management function 323 (corresponding to 144 in FIG. 1), the API 324 (corresponding to 145 in FIG. 1), and the application 325 (146 in FIG. 1). It corresponds 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. , When the content is output to a connected peripheral device (not shown, corresponding to 162 and 170 in FIG. 1), content protection processing is performed. API 32
Reference numeral 4 denotes an I/F for the application management function 323 and the application 325 to operate in cooperation with each other.

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

The codec type of the video decoder 306 is a broadcast medium received by the broadcast tuner 301, that is, terrestrial digital television broadcast, BS digital broadcast, broadband CS digital broadcast, advanced BS digital broadcast, advanced broadband CS digital broadcast, narrow band CS digital. MPEG-2 (terrestrial digital television broadcast, BS digital broadcast, broadband BS digital broadcast), H.264 as a codec type according to the received broadcast such as broadcast. H.264 (AVC: Advance Video
Coding) (narrowband CS digital broadcasting), H.264. 265 (HEVC: High Efficiency Video Codi
ng) (advanced BS digital broadcasting, advanced broadband CS digital broadcasting). The codec type is not limited to this. The communication control unit 340 uses the communication network 3
Network I/F 341, which is an I/F with 51, and a remote controller (remote controller)
It has a remote control I/F 342 which is an I/F with 352.

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

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

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

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

Scramble key (Ks) 401, work key (Kw) 402, and master key (Km) 4
A key 03 is managed by the broadcasting station 200. Also, 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,
An encryption unit managed by the broadcasting station 200.

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

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

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

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

The ECM 410 is related information common to the receivers and transmitted by the broadcasting station 200. ECM410
Contains the scramble key (Ks). This ECM 410 is a work key (Kw) 40
2 is used for encryption by the encryption unit 405.

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

The master key (Km) 423 is stored in a hidden state in the CAS module (IC card). The subscriber applies to the broadcasting station for the CAS module ID (card ID) that is the identification information of the CAS module (IC card) 303 when acquiring the right to view the program broadcast by the specific broadcasting station 200. The broadcasting station 200 uses a key management system (not shown) to manage the subscriber's C corresponding to the applied CAS module ID (card ID).
The master key (Km) 423 of the AS module 303 can be identified. In this way, the broadcasting station 200 can obtain the master key 403 which is the same as the master key 423 of the subscriber's CAS module 303 from the above-mentioned key management system.

That is, the broadcasting station 200 can encrypt the EMM 411 by using the master key (Km) 403 with the information CAS module ID (card ID) obtained when applying for the subscriber. Further, the broadcasting station 200 sets the information of the CAS module ID (card ID) obtained when applying for the subscriber in the non-encrypted part of the EMM 411 to transmit the EMM4.
11 can be set for each subscriber.

The receiver 300 receives the CAS module ID (in the non-encrypted part of the received EMM 411).
EMM411 for the self is extracted from the information of the card ID), and the extracted EMM for the self is extracted.
411 to the CAS module 303. The CAS module 303 that has received the EMM 411 uses the master key (Km) 423 stored in a secret state inside to use the EMM.
The decrypting unit 426 decrypts 411 to extract the work key (Kw) 422. Further, the CAS module 303 uses the extracted work key (Kw) 422 to decrypt the ECM 410 with the decryption unit 425, and extracts the scramble key (Ks) 421 included therein. CAS
The 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 scramble key (K
The descrambler 420 that has received s) internally sets the received scramble key (Ks).

The descrambler 420 of the receiver 300 has a scramble key (Ks) set internally.
The broadcast wave received using 421 is descrambled 420, and the program content included in the broadcast wave is provided to the user.

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

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

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

442 is an ECM received by the receiver 300 and a scramble key (K
s) represents a temporal transition. ECM1 includes scramble keys Ks0 and Ks1, ECM2 includes scramble keys Ks1 and Ks2, and ECM3 includes scramble keys Ks2 and Ks3. In this way, the ECM has an ODD (odd number) key and an EVEN (
It is possible to store both scramble keys (Ks) of even-numbered keys.

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

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

In the advanced BS digital broadcasting and the advanced broadband CS digital broadcasting, the time relationship between the ECM and the scramble key (Ks) contained therein and the broadcast signal to be descrambled using the scramble key (Ks) is shown in the figure. 4B, the update cycle of the scramble key (Ks) is changed from 2000 ms to 8000 ms, and the timing of preceding reception of ECM is set to 160
The principle is the same if read from 0 ms to 7600 ms.

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

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

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

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

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

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

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

If the result of determination is that it has not been transmitted (No in S603), the control unit 506 sends an NIT (Network Information Table) sent from the TS decoder 503.
), the tuner unit 501 is controlled in order to select the broadcast wave in which the service_id is transmitted (S610).

The control unit 506 controls the CAT (Conditional Ac) arranged in the selected broadcast wave.
PID (Packet Identi) of the EMM included inside the cess Table.
recognizing the file) and receiving the EMM. The control unit 506 determines the EMM addressed to itself from the received EMMs based on the card ID information set in the non-encrypted portion of the EMM. When the control unit 506 extracts the EMM addressed to itself based on the card ID information, the EMM is extracted.
Is transmitted to the IC card 511. Upon receiving the EMM from the control unit 506, the IC card 511 decrypts the encrypted EMM using the master key (Km) provided therein, and the work key (Kw
) Is extracted and saved (S611).

Further, the control unit 506 refers to the received PAT (S605) and selects the service to be tuned to.
The PMT with the ce_id is received (S606), and the ECM P included in the received PMT.
The ID is recognized and the ECM is received (S607). When the control unit 506 receives the ECM,
An ECM reception command is issued to the IC card 511.

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

The IC card 511 extracts the scramble key (Ks) normally (Yes in S612).
), the scramble key (Ks) is sent to the control unit 50 as a normal response to the ECM received command.
Send to 6.

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

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

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

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

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

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

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

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

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

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

"A-3-2 Update cycle,
The ECM update cycle is described in 5.8.5 ECM update/retransmission in this volume.
As the timing according to the processing capacity of the IC card,
・Maximum processing time of 1 ECM is 800 ms. ・Receiver specifications are assumed under the assumption that the update interval of different ECMs is 1000 ms or more. With the revision of version 1.0 of this document, the update cycle was reviewed with the following assumptions.
・While watching BS broadcasting on the TV screen, BS backside program recording can be processed with one IC card.
・The same thing can be done with one card as an IC card for simultaneous display of two BS channel screens.
From the above, if the ECM update interval is 2000 ms or more, two scramble services for at least inputs in different TSs can be processed by one IC card. "
That is, the CAS module (IC card) conforming to Non-Patent Document 1 has a scramble key (K
Since the processing can be performed with respect to the update cycle of 1 second of s), at least 2 channels (two tuners) can be processed by setting the update cycle of the ECM to 2 seconds.

That is, by setting the update cycle of the ECM to 2 seconds, if the CAS module (IC card) conforming to Non-Patent Document 1 has 2 channels (
Up to two tuners) are allowed.

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

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

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

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

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

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

Processing for selecting the broadcast wave of channel 1 to be output to the monitor by the first tuner section 801-1 and simultaneously selecting the broadcast wave of channel 2 to be recorded by the recording/recording section 812 by the second tuner section 801-2 Will be explained.

Channel 1 (servi) output to the monitor by the user operating the remote controller 810.
If ce_id_1) is selected, the control unit 806 receives the PAT extracted by the TS decoding unit 803 and determines whether the PMT of service_id_1 is transmitted in the currently received broadcast wave.

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

The control unit 806 controls the PID of the EMM included in the CAT arranged in the selected broadcast wave.
To receive the EMM. The control unit 806 controls the EMM addressed to itself from the received EMM.
From the information of the card ID set in the non-encrypted part of the EMM. Control unit 80
6 extracts the EMM addressed to itself based on the information of the card ID, and transmits the EMM to the IC card 811. The IC card 811 that has received the EMM from the control unit 806 decrypts the encrypted EMM using the master key (Km) that it has, extracts the work key (Kw), and stores it.

In addition, the control unit 806 refers to the received PAT and refers to the service_id_to be selected.
1 PMT is received, ECM PID included in the received PMT is recognized, and ECM is recognized.
To receive. Upon receiving the ECM, the control unit 806 issues an ECM reception command to the IC card 811.

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

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

The control unit 806 that receives the scramble key (Ks) receives the scramble key (Ks).
To the descrambler 802. The descrambler 802 internally sets the received scramble key (Ks).

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

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

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

The control unit 806 controls the PID of the EMM included in the CAT arranged in the selected broadcast wave.
To receive the EMM. The control unit 806 selects the EM addressed to itself from the received EMM.
M is judged from the information of the card ID set in the non-encrypted part of the EMM. Control unit 8
06 extracts the EMM addressed to itself based on the information of the card ID, and transmits the EMM to the IC card 811. The IC card 811 that has received the EMM from the control unit 806 decrypts the encrypted EMM using the master key (Km) that it has, extracts the work key (Kw), and stores it.

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

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

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

Therefore, the control unit 806, when the ECMs are continuously received from the TS decoding unit, the ECM
The timing for requesting the ECM processing is adjusted in consideration of the resending cycle and the ECM reception command for requesting the processing.

Similarly, in the processing of EMM, the IC card 811 is the first tuner unit 801-1.
Since it is necessary to perform both the processing of the EMM included in the broadcast wave selected in step 1 and the processing of the EMM included in the broadcast wave selected by the second tuner section 801-2, the control section 806 controls each of them. The timing for requesting the EMM processing is adjusted so as not to overlap with the timing for requesting the ECM processing, and the command is issued to the IC card 811.

The IC card 811 has already received the contracted EMM at the time of processing the ECM included in the broadcast wave selected by the first tuner unit 801-1. From the received EMM, the work key (Kw ) Has been extracted, the work key (Kw) can be used to decrypt the EMC requested to be processed to extract the scramble key (Ks). IC card 81
When decrypting the EMC and extracting the scramble key (Ks), 1 transmits the scramble key (Ks) to the control unit 806 as a normal response to the ECM received command to the control unit 811.

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

When reproducing the recorded program stored in the recording/recording unit 821, the recording/recording unit 8
The recording format stored in 21 is returned to the format decoded by the TS decoding unit 803, and output to the monitor by the video/audio decoding unit 804.

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

When the receiver is equipped with three or more tuners, for example, when it corresponds to a so-called W back-recording function capable of simultaneously recording two different channels other than the program being viewed, ECM processing, E
The MM process becomes complicated.

If one CAS module (IC card) can support up to 2 channels, 3
In order to reliably process one tuner, it is necessary to mount two CAS modules (IC cards).

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

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

The first tuner section 901-1 selects the broadcast wave of the channel 1 to be output to the monitor, and the second tuner section 901-2 simultaneously selects the broadcast wave of the channel 2 to be recorded by the recording/recording section 912, and simultaneously records the same. The third tuner unit 901 outputs the broadcast wave of channel 3 recorded by the recording unit 912.
A process for selecting a channel at -3 will be described.

Channel 1 (servi) output to the monitor by the user operating the remote controller 810.
If ce_id_1) is selected, the control unit 906 receives the PAT extracted by the TS decoding unit 903 and determines whether the PMT of service_id_1 is transmitted in the currently received broadcast wave.

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

The control unit 906 controls the PID of the EMM included in the CAT placed in the selected broadcast wave.
To receive the EMM. The control unit 906 selects the EM addressed to itself from the received EMM.
M is judged from the information of the card ID set in the non-encrypted part of the EMM. Control unit 9
06 extracts the EMM addressed to itself based on the information of the card ID, and transmits the EMM to either the first IC card 911-1 or the second IC card 911-2 which is determined in advance. The first IC card 911-1 or the second IC card 911-2, which has received the EMM from the control unit 906, decrypts the encrypted EMM using the master key (Km) provided therein,
The work key (Kw) is extracted and saved.

In addition, the control unit 906 refers to the received PAT, and selects the service_id_to be selected.
1 PMT is received, ECM PID included in the received PMT is recognized, and ECM is detected.
To receive. Upon receiving the ECM, the control unit 906 determines a predetermined first IC card 91.
The ECM reception command is issued to either 1-1 or the second IC card 911-2.

The first IC card 911-1 or the second IC card 91 that has received the ECM reception command
1-2 decrypts the ECM encrypted using the extracted work key (Kw) and extracts the scramble key (Ks).

The first IC card 911-1 or the second IC card 911-2 has a scramble key (K
When s) is normally extracted, the scramble key (Ks) is transmitted to the control unit 906 as a normal response to the ECM reception command.

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

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

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

Since the control unit 906 is included inside the CAT arranged in the selected broadcast wave, the P
Recognize the ID and receive the EMM. The control unit 906 determines the EMM addressed to itself from the received EMMs based on the card ID information set in the non-encrypted portion of the EMM. When the control unit 906 extracts the EMM addressed to itself based on the card ID information, the control unit 906 transmits the EMM to a predetermined first IC card 911-1 or second IC card 911-2.
The first IC card 911-1 or the second IC card 9 that has received the EMM from the control unit 906
11-2 decrypts the EMM encrypted using the master key (Km) that it has, extracts the work key (Kw), and stores it.

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

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

For example, the first tuner unit 901-1 and the second tuner unit 901-2 are connected to the first IC card 91.
It is assumed that the processing is performed by 1-1, and the third tuner unit 901-3 is associated with the second IC card 911-2. In this case, a subscription contract is made in order to acquire the right to watch channels A, B, and C provided as pay broadcast by the information of the card ID of the first IC card 911-1, and the card ID of the second IC card 911-2. When a subscription contract is made to acquire the right to watch channels D, E, and F provided as pay broadcasting by the information of, for example, channel A and F are simultaneously recorded while watching channel C. Is the first tuner section 90
If channel C is selected in 1-1, channel A is selected in the second tuner section 901-2, and channel F is selected in the third tuner section 901-3, the contracted pay broadcasting channel and the first IC card 911 are selected. -1 and the second IC card 911-2 can be associated.

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

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

In the present embodiment, in a receiver equipped with a plurality of tuners for the convenience of the user,
In order to reduce the burden on the user of setting the association relationship between a plurality of tuners and a plurality of IC cards and to reduce costs, a rule is created to enable processing with as few IC cards (CAS modules) as possible.

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

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

The summary of the main points of this embodiment can be summarized as follows.
(1). EMM and/or EMM individual message sent to the same receiver (CAS module ID) per ECM retransmission cycle, update cycle, and one broadcaster in a broadcast operating an access control method (conditional access method or content protection method) A digital broadcast transmitter/receiver that specifies the transmission frequency of.

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

(2). In broadcasts that operate access control methods (conditional access method or content protection method), when more than two reception/viewing or recording/recording are performed at the same time, the ECM retransmission cycle, update cycle, and the same reception per business entity Frequency of EMM and/or EMM individual message to be sent to the receiver (CAS module ID) is set, and E to the receiver is set.
In the grace period from the reception of the MM and/or EMM individual message to the command issuance to the CAS module, the EMM and/or EMM individual message processing of each of the mounted tuners is performed based on the EMM and/or EMM individual message transmission frequency. Digital broadcasting receiving device that controls the issuance schedule to.

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

(3). EMMs sent to the same receiver (CAS module ID) per entity in broadcasting that operates access control methods (conditional access method or content protection method)
And/or a digital broadcast transmission device that controls transmission of the EMM individual message so as to be transmitted at a predetermined frequency.

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

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

(6). Above (1). The EMM and/or E addressed to one CAS ID
The transmission frequency of the MM individual message is the EM to be transmitted in the grace period from the reception of the EMM and/or the EMM individual message until the command is issued to the CAS module.
A digital broadcast transmitter/receiver device defined by the number of M 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 content described in, the control of the issuance schedule to the CAS module is transmitted in the grace period from the reception of the EMM and/or the EMM individual message addressed to the CAS module to the issuance of the command to the CAS module.
A digital broadcast receiving device controlled by the number of MM and/or EMM individual messages.

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

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

(10). Above (3). In the contents described in, EMM/EM sent to the same receiver
The frequency of sending M individual messages is the number of EMM and/or EMM individual messages to be transmitted in the grace period from the reception of the EMM and/or EMM individual message addressed to the CAS module to the issuing of the command to the CAS module. Digital broadcasting transmitter controlled by.

(11). Above (3). The digital broadcast transmitting apparatus according to the above description, wherein the transmission frequency of EMM and/or EMM individual messages transmitted to the same receiver is controlled by the number of EMM and/or EMM individual messages transmitted per ECM or scramble key update period.

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

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

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

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

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

On the other hand, the EMM has an attribute that does not require immediate processing as compared with the ECM, but in some cases, the processing is not as immediate as the ECM, but may require processing as quickly as possible. For example,
(A) A viewer A who wants to acquire the right to watch a program broadcast by a specific broadcasting station (entity)
Call the customer center of the broadcasting station (entity) to subscribe for procedures regarding subscription and troubles at the time of subscription, select the channel of the broadcasting station with your own receiver according to the guidance of the telephone,
(B) Viewer A reports the card ID number of the receiver of viewer A, and the broadcasting station (entity) sets the card ID number notified by phone while the viewer A is on the phone. (C) If the receiver of the viewer A receives the EMM and extracts the scramble key (Ks), the broadcast signal of the channel can be descrambled (so-called unlocking is possible). Become)
(D) With this, the viewer A can confirm the completion of the contract procedure,
In the case of the scenes (a) to (d), the EMM processing is not as immediate as the ECM, but in reality, it may be necessary to perform the processing as quickly as possible.

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

The ECM may control the reception of the ECM so that the receiver receives at least one within the period in which the same Ks is used in accordance with the update of the scramble key (Ks). Since the receiver does not control the reception of the EMM, all the EMMs transmitted to itself are received and all the received EMMs are CAS modules (IC cards).
It is believed that the basic method is to send the request to the company for processing.

Therefore, after the receiver receives the EMM, the CAS module (IC
It is desirable to process the card). Therefore, in the ARIB standard, the CAS module provider has shown the response performance of the CAS module (IC card), and at the same time, after the receiver receives the EMM, the EMM reception command is issued to the CAS module (IC card). The grace period before doing was specified.

According to this stipulation, EMMs are unlikely to cause problems so much on the assumption that the EMMs are sent to the same CAS module (IC card) less frequently. It is also envisaged to send multiple EMMs in a short time.

Recently, the number of tuners installed has increased, and receivers equipped with a multi-channel recording function have been added. Furthermore, Appendix 5 of Part 1 of Non-Patent Document 5 for advanced broadband BS/CS broadcasting (so-called 4
K8K broadcasting) CAS and current wideband satellite broadcasting (so-called 2K broadcasting) CAS are integrated CA
Regulations that can be mounted on the S module have been specified.

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

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

Under such circumstances, in Non-Patent Document 5, Non-Patent Document 3 and Non-Patent Document 4, EC
If the update cycle of M (scramble key (Ks)) is different, or if ECM or EMM response performance is different between advanced broadband satellite broadcasting (so-called 4K8K) and current broadcasting (so-called 2K), the receiver Strict timing control examination is essential for ECM and EMM processing.

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

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

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

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

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

The scramble key (Ks) included in the ECM and the scramble key (Ks) included in the ECM
The details of the temporal relationship of the scramble key (ks) that descrambles the broadcast signal using (s) are as shown in FIG. 4B.

FIG. 11 shows the non-patent document 3 fifth edition, FIG. 5.8-1, the transmitting side is the scramble key (Ks).
5 is a diagram illustrating a timing of transmitting an ECM including a symbol and a timing of transmitting a video signal to be descrambled using a scramble key (Ks) included in the ECM. The horizontal axis is the time axis.

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

The section of T1+T2 is a section in which the same ECM is transmitted. The section of T3 is T1+T
This is a section in which the video signal descrambled using the scramble key (Ks) included in the ECM sent in section 2 is transmitted. The ECM containing the scramble key (Ks) is
From the video signal descrambled using the scramble key (Ks) included in the ECM, T
1 (=1600 ms) ahead, and transmitted from the broadcasting station.

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 time transition of the received program. The received program 1201 is time T
11 is scrambled with Ks0, from time T11 to T12 is scrambled with Ks1, from time T12 to T13 is scrambled with Ks2, and from time T13 to T14.
During the period, it indicates that the data is scrambled with Ks3.

1202 is a temporal transition of the received ECM. The ECM2 is received at the timing of the time T21, and it is shown that the ECM includes the scramble key (Ks) Ks1 and Ks2. The receiver is watching the program at the time T21. The ECM2 is received and the CAS module (I
Issue a command to C card). The CAS module (IC card) completes the ECM processing during the time from section T21 to section T12. The CAS module (IC card) transmits the scramble key Ks2 obtained by the ECM processing to the receiver, and the receiver receives the MUL.
It is set in the TI2 system descrambler, and the scrambled program is descrambled using Ks2 from time T12.

When switching from another channel between the sections T22 and T13, the receiver is
CM3 is received and a command is issued to the CAS module (IC card).

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

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

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

Assuming that the EMM addressed to the own receiver is received between the sections T21 and T12, T2
Since the EMM processing is not performed at the time point of 1, the receiver has 160 times between the sections T21 and T12.
At 0 ms, four ECMs can be processed (case 1 in FIG. 12).

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

Next, if the receiver starts the processing of the EMM received during the time T21 to T12 from the time T12, the CAS module (IC card) requires 500 ms for the processing of the EMM. The timing of receiving the notification of the completion of processing of the four ECMs from the IC card) exceeds the time of the time T22 at which descrambling is started using the next scramble key Ks3 by 100 ms. In other words, the receiver is the timing E of this T12.
When the MM process is started, the ECM process must be completed until T13 is 1500.
Since it is ms, only 3 ECMs can be processed (case 2 in FIG. 12).

Next, when the receiver receives the EMM at T23, which is the update timing of the ECM, and starts the processing, there is 1100 ms remaining between the sections T23 and T14, and up to two ECMs can be processed (FIG. 12). Case 3). That is, under the above assumptions, one CAS module (I
It is possible to consider that the number of tuners that can be processed by C card) is up to 2 tuners.

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

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

The difference between FIG. 13 and FIG. 5 is that two tuner units are added and the tuner unit is composed of a first tuner unit 1301-1, a second tuner unit 1301-2, and a third tuner unit 1301-3, and three tuners. A distributor 1313 is added to correspond to the unit, and the built-in recording/recording unit 13
12 is added. Other than 1302 to 1311, 502 to 5 in FIG.
Same as 11.

The three tuner units are terrestrial digital television broadcasting, BS digital broadcasting, and broadband CS.
Any tuner of digital broadcasting or a tuner capable of selecting three waves may be used, and it is assumed that any three channels can be viewed or recorded/recorded as the specifications of the receiver.

It is assumed that one IC card 1311 (CAS module) used here has the response performance of ECM and EMM capable of processing three tuners. For example, regarding the response performance of the IC card 1311, the response performance of the ECM is 300 ms and the response performance of the EMM is 500 ms. Receiver 1
300 receives 1 within the grace period in which EMM processing is required for the IC card 1311 after receiving EMM.
Suppose you have sent one EMM per entity.

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

1401 is a temporal transition of the received program. The received program 1401 is at time T1
It is shown that Ks0 is scrambled up to 1, Ks1 is scrambled from time T11 to T12, Ks2 is scrambled from time T12 to T13, and Ks3 is scrambled from time T13 to T14. .. 1402 is a temporal transition of the received ECM.

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

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

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

Channel 1 (service_id_1) when the user operates the remote controller 1310
If is selected, the control unit 1306 determines that the service wave is being received in the currently received broadcast wave.
It is judged whether the PMT of e_id is transmitted by receiving the PAT extracted by the TS decoding unit 1303.

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

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

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

The IC card 1311 that has received the EMM from the control unit 1306 has a master key (
The encrypted EMM is decrypted using Km), and the work key (Kw) is extracted and saved.

In addition, the first tuner unit 1301-using a program guide (not shown) previously operated by the user.
Recording reservations are made for programs A and B of two channels different from the channel selected in 1 and output to the monitor, which are scheduled to be broadcast at the same time zone.

The control unit 1306, when making a recording reservation, at least service_i of the program to be reserved.
d, the program start time (including date and time), the end time or the broadcast duration from the program start is stored in a memory area (not shown) for schedule management of the recorded program. The control unit 1306 performs schedule management so that the program A is selected by the second tuner unit 1301-2 and the program B is selected by the third tuner unit 1301-3 for recording reservations of two different channels. Even in the programs selected by the second tuner unit 1301-2 and the third tuner unit 1301-3, the EM
The procedure of acquiring M is the same as that of the first tuner unit 1301-1.

The channel selected by the remote controller 1310 is selected by the first tuner unit 1301-1. The control unit 1306 controls the PAT of the broadcast wave of the program selected by the first tuner unit 1301-1.
, The PMT of the service_id_1 desired to be selected is received, the ECM PID is recognized, and the ECM is received. Upon receiving the ECM, the control unit 1306 receives the IC card 131.
Issue an ECM receive command to 1.

The IC card 1311 that has received the ECM receives the EMM that has already been contracted, and the work key (
If Kw) has been extracted, the scramble key (Ks) is transmitted 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 scramble key (Ks) and sends it to the TS decoding unit 1303. The TS decoding unit 1303, which has received the descrambled broadcast signal,
Extract the specified video and audio signals by the PID of the video or audio ES of the selected channel,
It is sent to the video/audio decoding unit 1304. The video/audio decoding unit 1304 decodes the transmitted video and audio signals and outputs them to the monitor 14 and a speaker (not shown).

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

The control unit 1306 controls the service_id_2 of the program A in the currently received broadcast wave.
The PMT extracted by the TS decoding unit 1303 is received to determine whether the PMT is transmitted.

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

The control unit 1306 controls the CAT arranged in the broadcast wave selected by the second tuner unit 1301-2.
It recognizes the PID of the EMM contained inside and receives the EMM. The control unit 1306 selects the EMM addressed to itself from the received EMM, and the card ID set in the non-encrypted part of the EMM.
Judge from the information in. 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 is the EM encrypted using the internal master key (Km).
M is decrypted, the work key (Kw) is extracted and saved.

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

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

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

Since program A is reserved for recording, video ES, audio ES, and subtitle ES to be recorded and recorded.
The partial TS including the above is reconfigured by the control unit, encrypted with the encryption key unique to the receiver, and
The data is accumulated in the recording/recording unit 1312 such as D.

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

When the reserved program A or the program B is to be played back, the recorded program list is displayed on the user interface (not shown) shown on the screen, and after the program to be played back is selected, the control unit 1306 records it. -Read from the recording unit 1312 and descramble with a key unique to the receiver,
After obtaining the compressed video/audio signal, the video/audio decoding unit 1304 decodes the compressed signal and outputs the decoded signal to a monitor or a speaker (not shown).

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 broadband CS digital (hereinafter 4K8K) broadcast receiver shown in FIG. 5-1 of the fifth edition of Non-Patent Document 5.

The receiver 1500 includes a tuner section 1501, a descrambler 1502, an MMT demultiplexing section 1503, a video/audio decoding section 1504, a display section 1505, a control section 1506, and a key input section 1507. The MMT demultiplexing unit 1503 analyzes the transmitted descrambled broadcast signal, sequentially extracts the transmission control signal, and transmits the transmission control signal to the control unit 1506. Control unit 15
06 can control the tuner unit 1501, the descrambler 1502, and the display unit 1505 based on the transmission control signal sent from the MMT demultiplexing unit 1503. The control unit 1506 can also receive a signal of an operation input from the remote controller 1510 via the key input unit 1507. The CAS module 1511 performs processing of ECM and EMM based on a command given from the control unit 1506, and a work key (Kw) and a scramble key (K
It is a CAS module that can extract s). The communication module 1515 is a module for communicating with a communication network. In the example of FIG. 15, the CAS module 1511 is 1
There are two cases.

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

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

First tuner section 1601-1, second tuner section 1601-2, third tuner section 1601
-3 is a corresponding tuner unit for 4K8K broadcasting. The receiver 1600 has a specification capable of viewing or recording/recording any three channels.

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

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

The response performance of the IC card (CAS module) 1611 is, for example, 6 times that of the ECM.
00 ms, the response performance of EMM is 650 ms.

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

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

1701 is a temporal transition of the received program. The received program 1701 is at time T1
It is shown that Ks0 is scrambled up to 1, Ks1 is scrambled from time T11 to T12, Ks2 is scrambled from time T12 to T13, and Ks3 is scrambled from time T13 to T14. .. 1702 is a temporal transition of the received ECM.

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

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

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

When a specific channel (service_id) is selected by the user's operation of the remote controller 1610, the control unit 1606 uses the TLV-NIT that has been received and stored in advance to set the se.
Get the TLV_stream_id of the rvice_id, get its carrier frequency,
A channel selection process is performed by controlling the first tuner unit 1601-1. The control unit 1606 also performs the following processing.

The control unit 1606 acquires the IP data flow information from the AMT that has previously received and stored the broadcast signal converted into the TLV stream by the first tuner unit 1601-1, and acquires the MMT.
It is set in the demultiplexing unit 1603. PLT (Package List) in PA message
Table) and acquires MPT (MMT Package) of the specified service_id.
Table) IP data flow and packet ID are acquired, and MMT demultiplexing unit 1 is acquired.
Set to 603. The MMT packet of the packet ID is received, the PA message is acquired, and the MPT in the PA message is acquired.

Further, the control unit 1606 recognizes the PID of the EMM from the CAT (MH) arranged in the IP data flow selected by the first tuner unit 1601-1, and receives the EMM. Control unit 160
6 extracts the EMM addressed to itself based on the information of the CAS module 1611,
M is sent to the CAS module 1611.

The control unit 1606 sends the EMM to the CAS module 1611 at the timing shown in FIG. The control unit 1606 temporarily stores the received EMM until the appropriate timing to send the EMM to the CAS module 1611. Upon receiving the EMM from the control unit 1606, the CAS module 1611 receives the master key (K
Decrypt the encrypted EMM using m) and extract and save the work key (Kw).

In addition, the first tuner unit 1601-using a program table (not shown) previously operated by the user.
Recording reservations are made for programs C and D of two channels scheduled to be broadcast in the same time zone, which are different from the channel selected in 1 and output to the monitor.

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

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

The CAS module 1611 that received the ECM receive command receives the extracted work key (K
w) is used to decrypt the encrypted ECM to retrieve the scramble key (Ks).

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

Upon receiving the scramble key (Ks), the control unit 1606 receives the received scramble key (Ks).
) Is transmitted to the descrambler 1602. The descrambler 1602 internally sets the received scramble key (Ks). The descrambler 1602 uses the set scramble key (Ks) at the necessary timing as shown in FIG.
-1 descrambles the broadcast signal sent from -1.

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

The reserved recording is performed by the user for a desired program using an electronic program guide (EPG, not shown) or the like.
The control unit 1606 controls the second tuner unit 1601-at a time slightly before the start time of the program C scheduled to be broadcast in the same time zone reserved in advance in the program guide according to the setting contents of the recording reservation.
Channel 2 is selected to acquire the TLV stream. The assets descrambled by the descrambler 1602 through the same processing as that of the first tuner 1601-1 are processed by the MMT demultiplexing unit 160.
Assets such as video, audio, and subtitles to be recorded in 3 are separated, encrypted with an encryption key unique to the receiver, and stored in the recording/recording unit 1612 such as an HDD.

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

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

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

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

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

First tuner unit (4K8K) 1801-1 and second tuner unit (4K8K) 1801-2
Is a tuner/demodulator that has an IF reception band from the IF frequency of BS right-handed circularly polarized wave to the left-handed polarized wave of 110CS and is also compatible with the 16APSK modulation method.

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

The MMT demultiplexing unit 1803-1 is compatible with the MMT/TLV system multiplexing system operated in 4K8K broadcasting, and the TS decoding unit 1803-2 is compatible with the MPEG-TS system multiplexing system. The video/audio decoding unit 1804-1 is 4K8 for video encoding.
H.K. operated in K broadcasting. H.265/HEVC, MPEG-4 AA for voice coding
It corresponds to C, MPEG-4 ALS and the like. The video/audio decoding unit 1804-2 is an MPEG-2 system used in 2K broadcasting for video encoding, and MPE for audio encoding.
It is compatible with the G-2 AAC system.

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

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

In addition, as a new regulation of the transmitting side, “one business unit has one card I within the EMM processing grace period”.
When the frequency of transmitting EMM with D set is one in 30 seconds", or as a new regulation on the receiver side, "after receiving an EMM addressed to the CAS ID of its own receiver per business entity" , At least one EMM must be processed for the CAS module in 30 seconds,
If the receiver receives more than the specified EMM, it may be ignored or discarded. It is assumed that the regulation "

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

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

1901 is a temporal transition of the received 4K8K program. The received program 1901 is
Until time T11-4, between time T11-4 and T12-4, and time T12-4 to T1
It is shown that different scramble keys (Ks) are scrambled between 3-4 and between times T13-4 and T14-4. Reference numeral 1902 denotes a temporal transition of ECM and EMM reception for the 1901 program. 1903 is a temporal transition of the received 2K program. The received program 1903 includes the time T11-2 and the time T11-2 to T1.
2-2, between times T12-2 and T13-2, and between times T13-2 and T14-2, different scramble keys (Ks) are scrambled. Reference numeral 1904 denotes a temporal transition of ECM and EMM reception for the program of 1903.

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

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

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

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

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

That is, the processing of the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 can be performed within 7600 ms until the ECM is updated and the Ks of the broadcast signal is updated. Similarly to the case, when the channel selected by the first tuner unit (4K8K) 1801-1 and the second tuner unit (4K8K) 1801-2 is a different entity, 3
The first tuner section (4K8K) 1801-1 and the second tuner section (4K8K) 1 during 0 seconds.
It is necessary that at least one EMM, that is, two EMMs transmitted on the channel selected by 801-2 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 E
In CM and EMM, ECM requires immediate processing. Therefore, the priority is 2
When performing ECM processing in K broadcasting, 3 tuners are performed within 1600 ms after each ECM update, then ECM processing in 4K8K broadcasting is performed, and then EMM processing in 2K broadcasting or 4K8K broadcasting is performed. It is appropriate to assign the priority of processing. It is verified whether or not the processing using one CAS module 1811 is possible with the above processing priorities.

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

First, the ECMs of the third tuner unit (2K) 1801-3, the fourth tuner unit (2K) 1801-4, and the tuner unit (2K) 1801-5, which are tuner units of 2K broadcasting, are processed from the ECM update timing T21. Start. EC for 2K broadcasting in the CAS module 1811
Since the response processing time of M is 300 ms, the third tuner section (2K) 18 of 2K broadcasting is
01-3, the fourth tuner unit (2K) 1801-4, and the tuner unit (2K) 1801-5 have a response processing time of 900 ms.

Since the ECM response time of the 4K8K broadcast is 600 ms in this example, 1600-900=7 in the section until the time T12-2 of the update timing of the scramble key (Ks) of the 2K broadcast.
A 4K8K ECM can be processed in 00 ms. In this section, the ECM processing of the first tuner section (4K8K) is performed.

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

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

Similarly, from the ECM update cycle T23 of the next 2K broadcast, three 2K broadcast tuners (third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, tuner unit (2K
) 1801-5) ECM processing is performed. Two tuners for 4K8K (first tuner section (4
Since the ECM processing of the K8K) 1801-1 and the second tuner section (4K8K) 1801-2) has already been completed and there is still room before the Ks update timing T12-4 of the 4K8K broadcast, the 2K broadcast ECM update timing. From T13-2, three 2K broadcast tuners (third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, tuner unit (2K
) 1801-5) after performing ECM processing, the third tuner unit (2K) 1801-3 E
Perform MM processing.

Next, at the ECM update timing T24 of 2K broadcasting, three 2K broadcasting tuners (third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, tuner unit (2
K) The first tuner unit (4K8) which is a 4K8K tuner after the ECM processing of 1801-5)
K) Perform 1801-1 EMM processing. At this point, the Ks of the 2K broadcast has been updated four times and 8 seconds have passed, so the timing shifts to 4K8K Ks update timing T12-4.

After the Ks update timing T12-4 of the 4K8K broadcast, the processing flowchart of the Ks update timing T11-4 of the 4K8K broadcast is different from that of the third tuner unit (2K) 18
Instead of the EMM processing of 01-3, the EMM processing of the fourth tuner section (2K) 1801-4
Instead of the EMM processing of the first tuner section (4K8K) 1801-1, the second tuner section (4K
8K) 1801-2 is the point to perform EMM processing.

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

By controlling the order of the processes as described above, the first tuner unit (4K8K) can be updated at the scramble key (Ks) update timings T11-4, T12-4, T13-4 of 4K8K broadcast in 8 seconds×3=24 seconds. 1801-1, second tuner unit (4K8K) 1801-2, third tuner unit (2K) 1801-3, fourth tuner unit (2K) 1801-4, fifth tuner unit (2K)
) At least one EMM of 1801-5 can be processed, and the third tuner unit (2K) is operated every 1600 ms from the ECM update timing of 2K to the next Ks update timing.
) 1801-3, fourth tuner section (2K) 1801-4, fifth tuner section (2K) 180
ECM processing of 1-5 is performed, and ECM processing of the first tuner section (4K8K) and the second tuner section (4K8K) within 7600 ms from the ECM update timing of 4K8K broadcast to the scramble key (Ks) update. Was possible.

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

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

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

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

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

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

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 the period T11 to T12 of 2000 ms in which the scramble key Ks is used. Up to 30 EMMs can be processed in 30 seconds.

However, under the condition different from the above operation, for example, in the condition of the above example (Example 2), the EMM is used.
When it is stipulated that there is a possibility of transmitting 8 times for 30 seconds to one ID per business entity, which is the transmission frequency of (Example 3), a maximum of 32 IDs in 30 seconds with 4 tuners ( (8×4 tuners worth) of EMMs will be sent, and on desktop calculation, two EMMs can be processed per Ks update cycle of 2000 ms, and up to 30 EMMs can be processed within 30 seconds. ,
Up to 32 EMMs may be sent, which means that 2 EMMs cannot be processed.

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

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

As for the method of defining the frequency of the EMM, the tuner is installed in the CAS module (
This is an example in which the EMM addressed to the ID of the IC card) is received and then sent to the CAS module (IC card) per grace period. However, the method to be specified is not limited to this, and per business entity The EMM transmission frequency for one card ID may be quantitatively defined.

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

Further, as a regulation of the transmission frequency of the EMM, a regulation by a combination of the transmission frequency in the case where the transmission side sends the EMM in a burst and the grace period in which the reception side delays the processing to the CAS module after receiving the EMM, for example, one business EMM sent from the body to one CAS ID
There is also a defining method in which a maximum of 3 per 2 seconds and a maximum of 6 per 30 seconds.

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

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

“The maximum number of EMMs sent to the same receiver is two per 30 seconds per enterprise, and the maximum number of EMM individual messages sent to the same receiver is three per 30 seconds per enterprise.
It is also possible to change the width of the transmission time between the EMM and the EMM individual message. "A maximum of two EMMs can be transmitted to the same receiver for 30 seconds per business entity, and can be addressed to the same receiver. The maximum number of EMM individual messages that can be sent to is 3 per 2 seconds per enterprise. ”
In this example, the EMM is sent for 30 seconds, and the transmission frequency scramble key (K
This is the case when it is specified together with the update cycle of s).

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

The above is an example in which the transmission frequency of EMMs (including EMM individual messages) is specified in the operational rules. However, assuming that the EMM is missed by the receiver, the actual operation is also performed when the same EMM is retransmitted in a short time. Is assumed. Therefore, in the operation regulation, there is also a method in which after the EMM is received, the minimum number of EMMs to be received and processed within the grace period for the CAS module is defined. For example, "the number of receivers that have received an EMM/EMM individual message addressed to the same receiver should request the CAS module to perform processing is at least one in 30 seconds per business entity. 3
EMMs that exceed this in 0 seconds may be discarded. , Etc., specifies the minimum number that the receiver should process in the EMM processing grace period, and the receiver (CAS I
The EMM addressed to D) is a method in which it is acceptable to discard those exceeding the regulation.

As described above, the receiver is addressed to itself (C that is inserted in the receiver
After receiving the EMM or EMM individual message (addressed to the card ID of the AS module), CAS
How many EMMs can be used in the grace period until processing is requested for the module (IC card)?
It is easy to understand that it is necessary to process the message, but it is not limited to this, and the transmission frequency of EMM or EMM individual message addressed to itself per unit time per unit, or by the receiver. The number of EMMs that need to be processed may be specified.

In addition, there are demands for receivers equipped with multi-channel tuners, 2K, 4
In view of the demand for receivers with K and 8K integrated, in order to enable rigorous receiver design, in order to define the transmission frequency of EMMs and EMM individual messages consistent with past assumptions, the reverse of the above. It becomes possible by going through the examination process.

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

The number "6" is a temporary calculation of the performance of the CAS module.
It goes without saying that the result may change depending on the performance of the module. As a transmission/reception system,
EM considering the actual status of CAS module performance, ECM update cycle, and EMM processing grace period
The transmission frequency of M or the minimum number of EMMs to be processed within the processing grace period of EMMs is determined.

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

FIG. 21A shows the first tuner (4K8K) 1801-1 in the receiver shown in FIG.
Of the ECM and EMM received from the second tuner (4K8K) 1801-2, the third tuner (2K) 1801-3, the fourth tuner (2K) 1801-4, and the fifth tuner (2K) 1801-5. An example is shown. The receiver 1800 displays E at the time indicated by the arrow.
The receiver receives CM and EMM. EM from the second tuner (4K8K) 1801-2
After receiving M2121, the first tuner (4K8K) 1801-1 to ECM2110, the second tuner (4K8K) 1801-2 to ECM2120, and the first tuner (4K8K).
1801-1 to EMM2111, third tuner (2K) 1801-3 to ECM21
30, the fourth tuner (2K) 1801-4 to the ECM2140, the third tuner (2K)
) 1801-3 to EMM2131, 5th tuner (2K) 1801-5 to ECM2
It shows that 150 is received in order. The horizontal axis is the time axis.

FIG. 21B shows the ECM/EMM shown in FIG. 21A when the integrated CAS module of FIG.
The time transition for performing the ECM and EMM processing is shown. The horizontal axis is the time axis.

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

For example, 2160 represents the time the CAS module is processing the EMM 2121. Reference numeral 2161 represents the time during which the CAS module is processing the ECM 2110. 2162 represents the time during which the CAS module is processing the ECM 2120.
2163 represents the time when the CAS module is processing the EMM2111. Further, FIG. 2102-1 shows that the CAS module includes EMM2121, ECM2110, and ECM2.
This indicates that processing is performed in order of 120 and EMM2111.

2102-1, 2102-2, and 2102-3, the control unit 1806 controls the EMM 212.
When 1 is received, it is confirmed that there is no other high priority buffer, and the control unit 1806 causes the integrated C
Immediately after starting processing to the AS module 1811, 2110, 2120, 2111, 2
FIG. 6 is a diagram in which processing of the CAS module is considered when received in order of 130, 2140, 2131, and 2150. Further, since the processing of the integrated CAS module 1881 cannot be performed in parallel, other processing cannot be performed during the processing time of 2160, which is the processing of 2121, for example. In this consideration, in order to consider the worst condition, 2102-1, 21
In 02-2 and 2102-3, the processing of 2160 which is the processing of 2121 is first performed.

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

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

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

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

By prioritizing the processing of the 2K broadcast ECM, the processing time of the 2K broadcast ECM is as follows.
EMM2121 (650 ms) + ECM2130 (300 ms) + ECM2140 (30
0 ms) + ECM2150 (300 ms) = 1550 ms
Therefore, of the 2K ECMs, the processing of the ECM 2150 received last by the receiver in order is completed within 2000 ms.

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

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

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

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

A flowchart for giving the highest priority to the 2K broadcast ECM processing described with reference to FIG. 22 will be described. The control unit 1806 confirms the inside of the first 2K broadcast ECM reception buffer (S2).
201).

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

As a result of the confirmation, if the CAS card module 1811 does not have data waiting for request transmission in the 2K broadcast ECM reception buffer (No in S2202), the control unit 1806 proceeds to 4K8.
The contents of the K broadcast ECM reception buffer are confirmed (S2203).

As a result of confirmation, the CAS card module 181 is placed in the ECM reception buffer for 4K8K broadcasting.
If there is data waiting to be transmitted in request 1 (Yes in S2204), the control unit 1806 controls the CA
It issues a processing request command to the S module and waits for its response (S2208).

As a result of confirmation, the CAS card module 181 is placed in the ECM reception buffer for 4K8K broadcasting.
If there is no data waiting for request transmission in No. 1 (No in S2204), the control unit 1806 proceeds to E
The contents of the MM reception buffer are confirmed (S2205).

As a result of the confirmation, if there is data waiting to be transmitted to 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 the response ( S2208). The control unit 1806
The data having the oldest reception time in the EMM buffer is extracted, and the command of the processing request is issued to the CAS module 1811.

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

The control unit 1806, which has received the response from the CAS module 1811 in S2208, again executes S
Returning to the processing of 2201, the confirmation of whether there is data waiting for a processing request in the 2K broadcast ECM reception buffer, the 4K8K broadcast ECM reception buffer, and the EMM buffer is continued.

Note that FIG. 22 shows the processing priority only for the processing of ECM/EMM of the present invention. For other commands between the control unit 1805 and the CAS module 1811,
Omitted.

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

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

In Non-Patent Document 5, similarly, regarding the EMM processing grace period of the receiver,
-Regarding the EMM receive command and EMM individual message receive command, the receiver should issue commands to the CAS module within 30 seconds after receiving the EMM and EMM individual message addressed to its own card. (See Appendix 4 for related information.)
There is a description.

According to the present embodiment, for example, “EMM/EMM individual message addressed to the same receiver is C
The number of AS modules to be processed shall be at least one in 30 seconds per business entity. Three
EMMs that exceed this in 0 seconds may be discarded. ”
Is added.

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

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

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

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

An example will be described with reference to FIG. The control unit 1806 controls the MMT demultiplexing unit 1803-1 or T.
Upon receiving the EMM from the S decoding unit 1803-1, the EMM is sent to the CAS module 1811.
In order to request the process (1), the process request transmission process is started (S2400).

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

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

As a result of the confirmation, when the EMM reception buffer has data waiting to be transmitted to the CAS card module 1811 (Yes in S2402), the control unit 1806 confirms the elapsed time from the reception time of the data (S2404).

As a result of confirmation, when the elapsed time is over 30 seconds (Yes in S2404), the corresponding EM
The data of M is cleared (S2405). The control unit 1806 clears the data (S2
After 405), the process returns to S2401 again to continue the processing.

As a result of the confirmation, when the elapsed time has not exceeded 30 seconds (No in S2404), the control unit 180
6 issues a processing request command to the CAS module and waits for its response (S2406).
.. Upon receiving the response from the CAS module 1811, the control unit 1806 ends the process in order to confirm the priority with the ECM.

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

Since the processing of EMM is low in immediacy, the processing of FIG.
6 may be polling or the like to control the start of processing.

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

FIG. 25 is a flowchart showing the processing flow chart shown in FIG.
When the reception time of the M buffer is judged, and the EMM received within 30 seconds already exists in the EMM buffer, the EMM reception of the receiver in the case of adding the “Discard EMM received later” It is a processing flowchart.

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

Here, the EMM reception buffer has an area for storing only one EMM data for each business entity.

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

As a result of the confirmation, when the 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).

When the result of the confirmation is within 30 seconds (Yes in S2502), the control unit 1806 receives the EM.
The M data is discarded (2506), and the process ends (S2506).

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

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

As described above, in order to consider how many tuners can be designed with one CAS module (IC card), the ECM update cycle, the ECM retransmit cycle, and the installed C
In addition to the response performance of the AS module (IC card), one ID per EMM entity
Strictly by one CAS module without omitting ECM and necessary EMM processing by defining the transmission frequency per time or the minimum number of EMMs to be processed within the processing grace period of EMM on the transmitting and receiving system. It is possible to study the number of tuners that can be installed.

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

As described above, according to the present embodiment, at least the first control information (EMM) including the encrypted first key (Kw) and the second control information (ECM) including the encrypted second key (Ks).
And a tuner section for receiving a service signal including scrambled content, a descrambler for receiving the scrambled content output from the tuner section, a control section for controlling at least the tuner section and the descrambler, and the control section. The first key (Km) is controlled from the first control information (EMM) using a unique third key (Km).
CAS module for acquiring w) and acquiring the second key (Ks) for giving to the descrambler from the second control information (ECM) using the acquired first key (Kw). And
The control unit is
The first control information (EMM) per business entity is set to CA after receiving the EMM specified by the regulation.
It is set that at least R (integer of 1 or more) pieces should be processed within the processing grace period for the S module, and after detecting the first control information (EMM) of the one business entity, When the first control information (EMM) next to the one business entity is detected after R pieces are processed within the EMM process grace period, at least the first control information (EMM) within the EMM process grace period.
A receiver is provided that suppresses command transmission to the card unit.

As can be understood from the above description, the above-described embodiment has a function as a receiver,
Of course, it has characteristics as a transmitter and a transmission/reception system. Hereinafter, further main points in the above-described embodiment will be collectively described.
(1) The number of EMM/EMM individual messages sent to the same receiver is 30 (
(See *1) Maximum of M (see *2 below) in seconds.
(2) The number of EMM/EMM individual messages sent to the same receiver is 30 (
The maximum is M (see *2 below) and M2 (see *2 and 4 below) seconds for 2 (see *3 below).
(3) The maximum number of EMM/EMM individual messages sent to the same receiver is M2 (see below *2, 4) for 2 (see below *3) seconds per enterprise.
(4) The maximum number of EMMs sent to the same receiver is 30 (see *1 below) per enterprise (see *2 below), and EMM individual messages are 30 per enterprise (see below *1). ) Maximum M3 (see *2, 5 below) in 2 seconds.
(5) The maximum number of EMMs sent to the same receiver is 30 (see *1 below) per business entity (see *2 below), and 2 EMM individual messages per enterprise (see below *3). )
Maximum of M3 per second (see *2 and 5 below).
EMMs sent to the same receiver are up to M*2 in 2 seconds (see *3 below) per business entity.
The number of individual EMM messages is 30 (see *1 below) for a maximum of M3 per enterprise (see *2 and 5 below).
*1...30 seconds is CA after receiving the EMM/EMM individual message specified in the current operation regulations.
Grace period until processing for S,
*2... TR-B14 and B15 have the same number, TR-B39 has a different value,
*3: 2 seconds is the EC for the operation regulations TR-B14 and TR-B15 for current broadcasting (2K)
M (Ks) update cycle, 8 seconds for advanced BS/CS (4K8K) TR-B39,
*4... M2 is the case where the value of M is three or more, etc., and when the regulation for sending in burst within one Ks update cycle is required,
*5... The response time performances of EMM and EMM individual message CAS are actually different. EM
In the case of a rule proposal that takes into account the demand of operators to change the frequency with EMM, although there are few operations of M individual messages.

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

According to the above configuration (B1), even if there is exactly one CAS module, it is possible to view the contracted program without missing the processing of the ECM and EMM necessary for descrambling. Or a transmitter or a transmitter).
(B2)
In the receiver, the control unit controls the first control information (EMM) depending on whether the tuner unit receives terrestrial digital television broadcasting or BS digital broadcasting/broadband CS digital broadcasting. ) Is sent to the same frequency,
Alternatively, the first control information (EMM) is processed on the premise that the number of processing obligations of the first control information (EMM) is the same and the information for determining the frequency or the number is common. To do.

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

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

According to the configuration of (B4) above, the EMM in the CAS module conforming to TR-B39,
Even if the command response performance of the ECM is different from the command response performance of the IC card of TR-B14,15 pure, other EMM frequency can be set according to the performance of the CAS module conforming to TR-B39. In TR-B39, communication is possible. Since EMM can be obtained via the road, E only for broadcast waves
It is possible to set different frequency for TR-B14 and TR-B15 which can only transmit MM (TR-B3
In order to improve the service to new 4K8K pay broadcast subscribers, TR-B39 is targeted for late digital broadcasting as compared to 2K broadcasting such as TR-B14 and TR-B15. By increasing the number of EMMs to be sent for a certain period of time and performing EMM reception as soon as possible even if the receiver misses EMMs, it is possible to shorten the time from application for subscription to unlocking (EMM reception). Further, in the TR-B39, it is possible to set the priority order by regulation between the EMM acquisition via the communication path and the EMM acquisition via the broadcast wave. For example, in order to immediately unlock the pay viewing via the communication path. ECM followed by EMM via communication
Needless to say, increasing the priority of processing is also effective in terms of user convenience.
(B5)
The control unit determines whether the tuner unit receives a terrestrial digital television broadcast, a BS digital broadcast/broadband CS digital broadcast, or an advanced wideband satellite digital broadcast. , Assuming that the frequency of the first control information (EMM) being sent is the same, or assuming that the number of processing obligations of the first control information (EMM) is the same, The first control information (EMM) is processed with the frequency or the information for determining the number being common.

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

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

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

According to the configurations of (B7) and (B8), the number of EMMs (processing obligation) of EMMs and EMM individual messages is different. As a result, it is sufficiently assumed that the CAS module response performances of the EMM and the EMM individual message are different, a short response time and the size of the EMM individual message are predicted to be smaller than that of the EMM, and the response performance is expected to be short. Therefore,
It becomes possible to specify the frequency higher than that of EMM. Also, compared to EMM, the EMM individual message is the individual part (eg subscriber's name etc.) for each ID of EMM mail and automatic display message, so it is considered that the actual usage frequency is low, and the contract is being called. Since it is difficult to request immediacy such as for confirmation, the frequency of EMM is reduced, that is, the number of EMMs is set in a span longer than the EMM processing grace period, or the number is reduced even in the same processing grace period.
The advantage is that the time spent for processing M and ECM increases.
(B9)
The frequency of the first control information (EMM) is set according to the processing delay period of the first control information (EMM).

According to the configuration of (B9) above, the EMM frequency is determined by the EMM processing grace period.
In terms of processing the number of EMMs required at any time within the grace period, it can be said that the setting means is suitable for the purpose of setting the grace period. Even when considering the flow of the receiver, there is more freedom if it is decided during this period.
(B10)
The frequency of the first control information (EMM) is set based on the update cycle of the second key (Ks) of the first control information (EMM).

According to the above configuration (B10), 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. At the receiver, EM
When considering the filtering performance of M, it is meaningful to specify the number of EMMs for itself in a short time in terms of how many EMMs may be addressed to itself. However, this is a case where the business operator issues a plurality of EMMs in a short time. Issuing a plurality of EMMs in a short time is effective when a receiver fails to acquire an EMM or when the user wants to acquire an EMM as soon as possible and wants to send the same EMM in a short time. However, if only the EMM transmission rate is set, the EMM cache area will increase without limit if the processing grace period (30 seconds) remains. Therefore, the number is used to estimate the EMM temporary cache area instead of the transmission rate. Is valid.
(B11)
<Determine EMM frequency by Ks update cycle>
The frequency of the first control information (EMM) is set based on the processing grace period of the first control information (EMM) and the update cycle of the second key (Ks) of the first control information (EMM). Has been done,
According to the configuration of (B11), the EMM frequency is determined by the Ks update cycle in the configuration of (B11). If you want one to be received in 30 seconds, but you want to receive it as soon as possible, for example, “The receiver needs at least one process per business entity in 30 seconds. It is sent at a rate of 2 in 2 seconds, but after receiving the EMM, the EMM acquired in 30 seconds after that may be discarded or not received.” The remaining time is EMMs and Es from other tuners.
EMM can be received earlier by sending a large amount of EMM for a certain period of time for CM processing, allowing viewers to confirm the contract in a shorter time, and the receiver side also has a temporary amount of EMM cache. It is also possible to estimate.

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

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

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

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

Claims (1)

A first tuner unit receives a first service signal transmitted by a first terrestrial digital broadcasting business, and transmits a first scrambled content included in the first service signal at a predetermined frequency. 1a control information (EMM) of the 1st business entity including the encrypted 1a key (Kw), 2nd updated at the 1st cycle and shorter than the 1st cycle and smaller than a predetermined frequency Receiving 2a control information (ECM) of the first entity including an encrypted 2a key (Ks) transmitted at a period of
A second tuner unit receives a second service signal transmitted by a second terrestrial digital broadcasting entity, and transmits the second scrambled content included in the second service signal at a predetermined frequency. 1b control information (EMM) of the 1st business entity including an encrypted 1b key (Kw), 4th updated at a 3rd cycle and shorter than said 3rd cycle and smaller than a predetermined frequency Receiving second b control information (ECM) of the second entity including an encrypted second b key (Ks) transmitted at a period of
A descrambler descrambles the first scrambled content output from the first tuner unit,
A descrambler descrambles the second scrambled content output from the second tuner unit,
The control unit checks a predetermined table of the first content and the second content output from the descrambler,
Based on the packet ID included in the predetermined table, the 1a control information (EMM), the 2a control information (ECM), the 1b control information (EMM), the 2b control information (ECM). Controlling the first tuner unit, the second tuner unit, and the descrambler,
The CAS module is controlled by the control unit, and obtains the 1a key (Kw) from the 1a control information (EMM) of the 1st entity using a unique 3rd key (Km), Obtaining the second a key (Ks) for giving to the descrambler from the second a control information (ECM) of the first business entity, using the obtained first a key (Kw);
The CAS module is controlled by the control unit, and obtains the 1b key (Kw) from the 1b control information (EMM) of the second entity using a unique 3rd key (Km). , Obtaining the second b key (Ks) to be given to the descrambler using the obtained first b key (Kw) from the second b control information (ECM) of the first entity. ,,
Further, the control unit is
The 1a control information (EMM) of the first business entity, the 2a control information (ECM) of the first business entity, the 1b control information (EMM) of the second business entity, the Store the second b control information (ECM) of the second entity in a buffer,
The first command transmission corresponding to the 1a control information (EMM) is performed to the CAS module after receiving the 1a control information (EMM) in units of the first terrestrial digital broadcasting entity. A first period that is longer than the first cycle is set as the period, and it is set that at least Ra (integer of 1 or more) pieces of the 1a control information (EMM) are to be processed in the first period. Then
Performing a second command transmission to the CAS module corresponding to the second a control information (ECM) of the first business entity received by the first tuner unit and stored in the buffer during the first period. , A predetermined number of first command transmissions corresponding to the 1a control information (EMM) stored in the buffer to the CAS module at an excessive time other than the processing associated with the second command transmission in the first period. By performing the above, the minimum Ra (integer of 1 or more) pieces of the 1a control information (EMM) are processed in the first period,
The first command transmission corresponding to the 1b control information (EMM) is performed to the CAS module after receiving the 1b control information (EMM) in units of the second business entity of the terrestrial digital broadcasting. A second period longer than the third cycle is set as the period, and it is set that at least Rb (integer of 1 or more) pieces of the 1b control information (EMM) should be processed in the second period. Then
A second command transmission corresponding to the second b control information (ECM) of the second entity received by the second tuner unit and stored in the buffer during the second period is performed to the CAS module. , A predetermined number of first command transmissions corresponding to the first b control information (EMM) stored in the buffer to the CAS module at an excessive time other than the processing associated with the second command transmission in the second period. By performing the above, at least Ra (integer of 1 or more) pieces of the first b control information (EMM) are processed in the second period,
The second a key (Ks) updated in the first cycle is acquired, and the first scrambled content is descrambled by the descrambler and displayed.
The second b key (Ks) updated in the third cycle is acquired, and the first scrambled content is descrambled by the descrambler and displayed.
Discarding or suppressing the 1a control information (EMM) remaining in the buffer after the first period has elapsed since the 1a control information (EMM) of the 1st business entity was stored in the buffer. Then
Discarding or suppressing the 1b control information (EMM) remaining in the buffer after the second period elapses after storing the 1b control information (EMM) of the second entity in the buffer. Yes, the receiving method.

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