JP6942645B2 - Reception method - Google Patents

Description

The description of the embodiment relates to a receiving device for receiving a broadcast signal, but also extends to a broadcast signal transmitting device, a broadcasting signal transmitting / receiving device, and a method for realizing the device.

Currently, in devices that receive terrestrial digital television broadcasts, BS digital broadcasts, and broadband CS digital broadcasts, multiple different programs can be recorded at the same time (double recording function), and all channels can be recorded at the same time. Devices that can simultaneously record (record) the programs to be broadcast have been commercialized.

On the other hand, these broadcasts are scrambled on most channels regardless of whether they are pay-TV or free-to-air, and a CAS (Conditional Access System) module (IC card) is essential to receive and watch programs. There is.

The background of this scramble will be explained. When BS digital broadcasting started on December 1, 2000, only pay broadcasting was scrambled, and NHK and free commercial broadcasting were non-scrambled broadcasting.

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

A television broadcasting mechanism that allows contract programs to be descrambled only to subscribers is called a conditional access system (CAS). The limited reception method is defined by ARIB (Association of Radio Industries and Businesses) standard STD-B25 for domestic terrestrial digital television broadcasting, BS digital broadcasting, and wideband CS digital broadcasting, and the conceptual diagram is the standard STD. -B25, Part 1, Chapter 3.

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

Broadcasters frequently change and send scrambled keys (Ks) to prevent unauthorized descramble (the same key can be used for about 1 second). Therefore, the broadcasting station sends the ECM having the scramble key (Ks) of the scrambled key (Ks) of the video by the broadcast wave prior to the video to be descrambled.

On the other hand, when BS digital broadcasting started in December 2000, ARIB TR-B15 was stipulated as an operation regulation that regulates the actual operation parameters of this broadcasting. According to the ARIB TR-B15 Part 1 BS Digital Broadcasting Operation Regulations, Volume 5 BS Digital Broadcasting Limited Reception (CAS) Receiver Specifications and Operation Regulations, the scramble key (Ks) update cycle is the analog television up to that time. However, in consideration of the two-screen function (simultaneous viewing) that has been commercialized and the so-called back-recording function that records another channel (CH) during viewing, the update cycle described in the standard STD-B25 is set to about 1 second. On the other hand, the background is described so that at least two different channels can be simultaneously viewed and back-recorded if the update cycle is set to 2 seconds or more.

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

A scramble key (Ks) is required to descramble a contract broadcast program as described above, and a work key (Kw) is used to obtain this scramble key (Ks) (update cycle 2 seconds). It is necessary to decrypt the ECM (update cycle 2 seconds) including the scramble key (Ks), and in order to obtain the work key (Kw), the work key (Km) unique to the CAS module is used. It is necessary to decode the EMM containing (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 being broadcast at a certain time, such as an all-channel recording function, has been commercialized. in short,
(1) There is an environment in which many tuners can be used simultaneously in the receiver. In this case, each scramble key (Ks1 to Ksn) for a large number of tuners is required within 1 second or 2 seconds, but it is examined whether the receiver can take out the scramble key within a predetermined time. There is a need.
(2) Further, in the limited reception method, the EMM is transmitted for displaying / deleting the pay broadcasting contract information and the automatically displayed message, but there are mainly two types of transmission purposes. One is EMM transmission for regular renewal of the expiration date of the paid contract, and the other is a request to unlock or delete the automatically displayed message immediately after applying for subscription when a new subscriber subscribes to the operator. In some cases, the erasing EMM may be sent immediately in order to respond to the above. At this time, the same EMM may be repeatedly sent in the broadcast signal within 1 second or 2 seconds, assuming that the receiver may miss the EMM acquisition. Since the control unit of the receiver cannot determine whether or not the EMM contents have been updated, it can be received by a large number of tuners described in (1) within 1 second or 2 seconds even in such an environment. It is necessary that each scrambled key (Ks1 to Ksn) is surely acquired by the receiver for each scrambled video signal.

Consideration for ensuring that this scrambled key is obtained at the receiver needs to be considered in the current rules. If the receiver fails to obtain the scramble key, some contractors will not be able to watch the contracted program.

Therefore, in the present embodiment, for example, even if it is exactly one CAS module, a receiving method capable of viewing a contract program without missing the ECM and EMM processing required for descramble is provided. The purpose is.

According to the embodiment
The first tuner unit receives the first service signal transmitted by the first business entity of BS digital broadcasting, and transmits the first scrambled content included in the first service signal at a predetermined frequency. The first a control information (EMM) of the first entity, including the encrypted first a key (Kw), is updated in the first cycle and is shorter than the first cycle and less frequently than the predetermined frequency. Receiving the second a control information (ECM) of the first business entity including the encrypted second a key (Ks) transmitted in the cycle of
The second tuner unit receives the second service signal transmitted by the second business entity of CS digital broadcasting, and transmits the second scrambled content included in the second service signal at a predetermined frequency. The first b control information (EMM) of the second entity, including the encrypted first b key (Kw), is updated in the third cycle and is shorter than the third cycle and less frequently than the predetermined frequency. Receiving the second b control information (ECM) of the second entity, including the encrypted second b key (Ks) transmitted in the cycle of
The descrambler descrambles the first scrambled content output from the first tuner unit.
The 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.
The first a control information (E) is based on the packet ID included in the predetermined table.
MM), the second a control information (ECM), the first b control information (EMM), the second b control information (ECM), the first tuner unit, the second tuner unit, and the descrambler. To control,
The CAS module is controlled by the control unit, and obtains the first a key (Kw) from the first a control information (EMM) of the first business entity using a unique third key (Km). Using the acquired first a key (Kw) from the second a control information (ECM) of the first business entity, the second a key (Ks) to be given to the descrambler is acquired.
The CAS module is controlled by the control unit, and the first b key (Kw) is acquired from the first b control information (EMM) of the second business entity using a unique third key (Km). , The second b key (Ks) to be given to the descrambler is acquired by using the acquired first b key (Kw) from the second b control information (ECM) of the second business entity. , With
Further, the control unit
The first a control information (EMM) of the first business entity, the second a control information (ECM) of the first business entity, the first b control information (EMM) of the second business entity, the first The second b control information (ECM) of the second business entity is stored in the buffer, and the second b control information (ECM) is stored in the buffer.
The first a control information (EMM) in units of the first business entity of the BS digital broadcasting.
Is received, and then the first command transmission corresponding to the first a control information (EMM) is transmitted to the CAS.
As the period to be performed on the module, 30 seconds is set as the first period longer than the first period, and the first a control information (EMM) is set to the minimum Ra (integer of 1 or more) in the first period. ) Set what should be processed individually,
Performing a second command transmission corresponding to the first said period of first the 2a control information of the first entity stored in received the buffer by the tuner unit (ECM) to the CAS module , the predetermined number of transmitting said first command corresponding to the 1a control information stored in the buffer (EMM) during the time of treatment except with the transmitting the second command in the first period to the CAS module By doing so, the first Ra (integer of 1 or more) of the first a control information (EMM) is processed in the first period.
The 1b control information (EMM) in units of the second business entity of the CS digital broadcasting.
Is received, and then the first command transmission corresponding to the first b control information (EMM) is transmitted to the CAS.
As the period to be performed on the module, 30 seconds is set as the second period longer than the third period, and the first b control information (EMM) is set to the minimum Rb (1 or more) in the second period. Set what should be processed (integer),
The second received by the second tuner unit and stored in the buffer during the second period.
The 2b performs second command transmission corresponding to the control information (ECM) to the CAS module, the buffer during the time of processing other than that caused by transmitting the second command in the second period of the entities By transmitting a predetermined number of the first commands corresponding to the first b control information (EMM) stored in the CAS module to the CAS module, the first b control information (EMM) can be reduced to the minimum Rb (EMM) in the second period. Process 1 or more integers) and
Above discard the first 1a control information remaining in the buffer (EMM) after a lapse of the first period the the 1a control information of the first entity (EMM) from the stored in the buffer ,
To discard the remaining claim 1b control information (EMM) in the buffer after the lapse of the second period the claim 1b control information of the second entity (EMM) from the stored in the buffer , The receiving method is provided.

FIG. 1 is a diagram showing a configuration example of an entire system of a broadcasting station and a receiver (also referred to as a receiving device) according to an embodiment. FIG. 2 is a diagram schematically showing 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 shows a conceptual diagram of the limited reception method described in Non-Patent Document 1. FIG. 4B shows the ECM in the case of terrestrial digital television broadcasting, BS digital broadcasting, and wideband CS digital broadcasting, the scramble key (Ks) contained therein, and the broadcast to be descrambled using the scramble key (Ks). It is a figure which shows the temporal relationship of a signal. FIG. 4C is a conceptual diagram of the limited reception method described in Non-Patent Document 2. FIG. 5 is a basic configuration diagram when the receiver descrambles, which is described in Non-Patent Document 4. FIG. 6 is a processing flowchart of the limited reception process performed by the receiver shown in FIG. 5 described in Non-Patent Document 1. FIG. 7 is a diagram conceptually showing the update cycle of the scrambled key (Ks) and the processing of ECM and EMM. FIG. 8 is a basic configuration diagram of a receiver for descrambled broadcast waves when having two tuners, as opposed to the basic configuration of the receiver when having one tuner shown in FIG. FIG. 9 is a basic configuration diagram of a receiver for descrambled broadcast waves when it has three tuners, as opposed to the basic configuration of the receiver when it has two tuners shown in FIG. FIG. 10 is a diagram showing the temporal relationship between the ECM, the EMM, and the scrambled key (Ks). FIG. 11 illustrates the timing at which the transmitting side described in Non-Patent Document 4 transmits an ECM including a scrambled key (Ks) and the timing at which a descrambled video signal is transmitted using the scrambled key (Ks) included in the ECM. It is the one that was scrambled. FIG. 12 is an explanatory diagram relating to an implementation example of limited reception of the receiver in the transmission / reception system according to the transmission rule shown in FIG. FIG. 13 is a diagram showing an embodiment in which the number of tuner units is increased to three and a recording / recording unit is added to the basic configuration of the receiver shown in FIG. FIG. 14 is an explanatory diagram relating to an implementation example of the limited reception of the receiver shown in FIG. FIG. 15 is a basic configuration diagram of an advanced BS digital broadcast and an advanced wideband CS digital (hereinafter 4K8K) broadcast receiver described in Non-Patent Document 5. FIG. 16 is a basic configuration diagram of another receiver for descrambled a broadcast wave when the receiver having the basic configuration of FIG. 15 has three tuner units. FIG. 17 is an explanatory diagram relating to an implementation example of the limited reception of the receiver shown in FIG. FIG. 18 is a diagram showing a basic configuration example of a receiver which is another embodiment and has two tuner units for 4K8K reception and three tuner units for 2K reception. FIG. 19 is an explanatory diagram relating to an implementation example of the limited reception of the receiver shown in FIG. FIG. 20 is an explanatory diagram relating to an implementation example of limited reception of the receiver as in FIG. 12. In the receiver shown in FIG. 18, FIG. 21A shows the first tuner section (4K8K) 1801-1, the second tuner section (4K8K) 1801-2, the third tuner section (2K) 1801-3, and the fourth tuner section. It is a figure which shows the example of the time chart which received ECM, EMM from (2K) 1801-4, 5th tuner part (2K) 1801-5. FIG. 21B is a diagram showing a temporal transition in which the integrated CAS module of FIG. 18 processes the ECM / EMM shown in FIG. 21A with respect to the ECM and the EMM. FIG. 22 is a flowchart in which the receiver requests the CAS module to process the ECM and the EMM in order to give the highest priority to the ECM processing of the 2K broadcast described with reference to FIGS. 21A and 21B. FIG. 23 is a diagram showing an example of an EMM reception buffer having a storage area for storing the time when the EMM is received. FIG. 24 is a data processing flowchart of the receiver according to the embodiment that operates according to a predetermined regulation. FIG. 25 shows the processing flowchart shown in FIG. 24, “The EMM managed for each business entity, the reception time of the EMM buffer waiting for processing is determined, and the EMM received within the EMM processing grace period (30 seconds) is in the EMM buffer. It is a processing flowchart of the EMM reception of the receiver when the provision of "discarding the received EMM later when it already exists in" is added.

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 referred to as a receiving device) according to an embodiment.

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

The first basic function 103 is a basic function of the broadcasting station 100, in which a video signal, an audio signal, or the like of a program to be broadcast is encoded (also referred to as encoding) and multiplexed, and a broadcasting signal (the broadcasting signal is terrestrial). It has a function of transmitting as a broadcast signal of any broadcast wave type such as digital television broadcasting, BS digital broadcasting, wideband CS digital broadcasting, advanced BS digital broadcasting, and advanced wideband CS digital broadcasting). Therefore, the transmitted signal shall include the route via the satellite. In addition, the transmission signal may include a cable path.

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

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

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

The service provider device (sometimes referred to as a service provider) 120 creates and manages content in a service that simultaneously provides application functions added to a program broadcast by the broadcasting station 100 in cooperation with 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 the 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 device 120 responds to the request from the receiver 140 that has received the first designated information, and manages and distributes the applications and contents stored in the application server 122 by the application management / distribution 121 to a communication network such as the Internet. It is sent to the receiver 140 via.

The receiver 140 has a digital broadcast reception function (second basic function 141), a communication control unit 142, a second security function 143, an application management function 144, an API (API: Application Programming Interface) 145, an application 146, and the like. The control unit 147 is included, and the broadcast signal broadcast from the broadcast station 100 is received to receive various broadcast programs and various service information, or an application is acquired from the service provider device 120 via a communication network and operated. Can be done.

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

The second basic function 141 is to connect to peripheral devices connected to the receiver 140, for example, the display 160, the HDD (Hard Disk Drive) 162 bound to the receiver 140, and the removable media 170, and to send and receive data. It also manages.

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

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

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

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

Further, as the multiplexing method, an MPEG-2 Systems multiplexing method or an MMT (Mpeg Media Transport) multiplexing method may be used, or both may be used in combination. 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. The multiplexed stream (broadcast signal) is scrambled by the scrambler 206, transmitted to the transmitter 207 as the scrambled multiplexed stream, and transmitted from the antenna by the broadcast radio wave.

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

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

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

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

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

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

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

Further, the data broadcasting stream separated by the demultiplexer 304 is sent to the data broadcasting reception processing unit 305 to perform reception processing. The data broadcasting reception processing unit 305 extracts a display signal to be displayed on the display 328 as a data broadcasting from the data broadcasting stream sent from the demultiplexer 304, and inputs the extracted display signal to the data broadcasting engine 310. .. The data broadcasting engine 310 analyzes the sent display signal and outputs the analyzed content to the display control unit 327 via the synthesizer 326. The display control unit 327 displays the display content on the display 328 (corresponding to 160 in FIG. 1) based on the analysis content of the transmitted display signal.

The decoded video signal and subtitle signal are combined by the synthesizer 326 and output to the display 328 via the display control unit 327. The display control unit 327 sets the gamma characteristic, the display screen size, the display signal level, and the like.

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

Note that FIG. 3A describes the display 328 and the speaker 329 as an example of being built in the receiver 300, but even if it is an external display and speaker connected by an I / F such as HDMI, for example. good. The display control unit 327 also controls the content to be displayed on the display 328 even when the display 328 is an external display connected to the receiver 300 by an I / F such as HDMI.

The analysis unit 309 analyzes the application control information, the service data, and the control data, and sends the analysis result to the control unit 330 at any time.

The transmission control signal included in the control data includes the channel identification information and the 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 designated 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 designated information by analyzing the received control data, and transmits the extraction result to the control unit 330 at any time.

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

The second security function 322 reads information on 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 / F341. , Content protection processing is performed when outputting to a connected peripheral device (not shown, corresponding to 162 and 170 in FIG. 1). The API 324 is an I / F for the application management function 323 and the application 325 to operate in cooperation with each other.

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

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

Further, the control unit 330 decrypts the ECM and EMM from the encrypted ECM and EMM sent from the analysis unit 309 to the CAS module 303 in order to extract the scramble key (Ks) required for descramble. Give instructions to do. The CAS module 303 decodes the ECM and EMM and extracts the scramble key (Ks) based on the instruction of the control unit 330. When the CAS module 303 extracts the scrambled key (Ks), the CAS module 303 transmits the extracted scrambled key (Ks) to the control unit 330. When the control unit 330 receives the scramble key (Ks) from the CAS module 303, the control unit 330 transmits the received scramble key (Ks) to the descrambler 302. When the descrambler 302 receives the scramble key (Ks) from the control unit 330, the descrambler 302 internally sets the received scramble key (Ks). When descramble the scrambled broadcast signal, the descrambler 302 performs descramble using the scramble key (Ks) stored inside.

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

FIG. 4A shows a conceptual diagram of the limited reception method described in Non-Patent Document 1.

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

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

On the other hand, the CAS module 303 inserted in the receiver 300 is a decoding unit 425 that decodes the ECM using the work key 422, and the decoding unit 426 that decodes the EMM using the master key 423 is the receiver 300. It is a decoding unit managed by the CAS module 303 inserted in. Further, 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 generates an ECM 410 including a scramble key (Ks) and an EMM 411 including a work key (Kw) at their respective required timings. The broadcasting station 200 multiplexes the generated ECM410 and EMM411 with other program contents and the like, scrambles them with the scrambler 400 using the scramble key (Ks) 401 transmitted by the broadcast wave at that time, and uses the broadcast wave. Send.

The receiver 300 uses the scramble key (Ks) 421 obtained from the CAS module 303 to descramble the received broadcast wave with the descrambler 420, 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 particular station to watch the program broadcast by that station. Therefore, it is necessary that only the receiver 300 of the subscriber can take out the scramble key (Ks) 421 transmitted by the broadcast wave.

The ECM 410 is related information common to receivers transmitted by the broadcasting station 200. The ECM410 contains scrambled keys (Ks). The ECM 410 is encrypted by the encryption unit 405 using the work key (Kw) 402.

The EMM 411 is related information of the receiver identification unit (CAS module ID unit) transmitted by the broadcasting station 200. The EMM 411 includes a work key (Kw) 402 used to encrypt the ECM 410. The EMM 411 is encrypted by the encryption unit 406 with the master key (Km) 403. That is, the receiver 300 is loaded with CAS from the EMM which is the related information of the receiver identification unit (CAS module ID unit) linked one-to-one with the master key (Km) broadcast by the broadcasting station 200. If the EMM addressed to oneself can be recognized by the CAS module ID (card ID) obtained from the module 303, the EMM encrypted using the master key (Km) hidden in the CAS module (IC card) is decrypted and included in the decryption. The work key (Kw) to be obtained can be taken out, and the scramble key (Ks) contained in the encrypted ECM can be taken out by using the taken out work key (Kw).

The master key (Km) 423 is stored in a CAS module (IC card) in a concealed state. The subscriber applies to the broadcasting station for the CAS module ID (card ID), which is the identification information of the CAS module (IC card) 303, when acquiring the right to watch the program broadcast by the specific broadcasting station 200. The broadcasting station 200 can determine the master key (Km) 423 of the subscriber's CAS module 303, which is opposed to the applied CAS module ID (card ID), by the key management system (not shown) that manages the broadcasting station 200. .. In this way, the broadcasting station 200 can obtain the same master key 403 as the master key 423 of the subscriber 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 at the time of the subscriber's application. Further, the broadcasting station 200 can set the EMM 411 to be transmitted for each subscriber by setting the information of the CAS module ID (card ID) obtained at the time of applying for the subscriber in the unencrypted part of the EMM 411. can.

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

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

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

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

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

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

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

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

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

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

In broadcasting, the same signal is sent to all recipients, so if you continue to use the scramble key (Ks) for a long period of time, the scramble method itself is a public method specified by the ministerial ordinance notification, so all the keys for the key length It is possible to analyze Ks by brute force of. When such a situation occurs, the purpose of limited reception cannot be achieved. Therefore, in the current broadcasting, scrambled keys (Ks) that change with time are used. Non-Patent Document 1 defines the usage time of the same Ks as a minimum of about 1 second per ECM.

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

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

The receiver 500 includes a tuner section 501 (corresponding to 301 in FIG. 3), a descrambler 502 (corresponding to 302 in FIG. 3), a TS (Transport Stream) decoding section 503 (corresponding to 304 in FIG. 3), and video / audio decoding. Unit 504 (corresponding to 306 and 307 in FIG. 3), display unit 505 (corresponding to 327 in FIG. 3), control unit 506 (corresponding to 330 in FIG. 3), and key input unit 507 (corresponding to 342 in FIG. 3). include. The TS decoding unit 503 analyzes the transmitted broadcast signal after descramble, sequentially extracts the transmission control signal, and transmits the transmission control signal to the control unit 506. The control unit 506 can control the tuner unit 501, the descrambler 502, and the display unit 505 based on the transmission control signal sent from the TS decoding unit 503. Further, the control unit 506 can receive the operation input signal from the remote controller 510 via the key input unit 507. The IC card 511 (corresponding to 303 in FIG. 3) is a CAS module capable of performing ECM and EMM processing based on a command given from the control unit 506 and extracting a work key (Kw) and a scramble key (Ks). be. 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 process performed by the receiver 500 shown in FIG. 5 described in the non-patent sentence 1.

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

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

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

Further, the control unit 506 refers to the received PAT (S605), receives the PMT of the service_id to tune in (S606), recognizes the ECM PID contained inside the received PMT, and receives the ECM (S607). ). When the control unit 506 receives the ECM, the control unit 506 issues an ECM reception command to the IC card 511.

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

When the IC card 511 normally takes out the scramble key (Ks) (Yes in S612), the IC card 511 transmits the scramble key (Ks) to the control unit 506 as a normal response to the ECM reception command.

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

The descrambler 502 descrambles the broadcast signal sent from the tuner section 501 using the set scramble key (Ks) at the required 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 or speaker (not shown).

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

Next, a case where the receiver 300 is equipped with two tuners will be described.

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

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

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

In order to process a plurality of channels (multiple 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) and a CAS module (IC card) It is conceivable to consider a method that enables processing of a plurality of ECMs and EMMs within the time of the update cycle of the scrambled key (Ks) of 1 second by improving the performance of the scrambled key (Ks).

Actually, in Non-Patent Document 4, it is explained as follows.

"A-3-2 update cycle,
The update cycle of ECM is described in the update / retransmission of 5.8.5 ECM of this volume. The timing according to the processing capacity of the IC card is
-Assuming a maximum processing of 800 ms for 1 ECM-Receiver specifications are assumed on the assumption that the update interval of different ECMs is 1000 ms or more. With the revision of this document ver1.0, the update cycle has been reviewed assuming the following.
-While watching the BS broadcast on the TV screen, the BS counterprogram recording can be processed with one IC card.
-The same thing can be done with one IC card for simultaneous display of any BS channel on two screens.
From the above, if the ECM update interval is 2000 ms or more, at least two scramble services for input in different TSs can be processed by one IC card. "
That is, the CAS module (IC card) conforming to Non-Patent Document 1 can process the scramble key (Ks) with an update cycle of 1 second. Therefore, by setting the ECM update cycle to 2 seconds, at least It is possible to process two channels (two tuners).

That is, by setting the update cycle of the ECM to 2 seconds, if the CAS module (IC card) conforms to Non-Patent Document 1, up to 2 channels (2 tuners) are allowed according to the operation regulations regardless of the command response performance. That's what I did.

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

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

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

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

FIG. 8 is a basic configuration diagram of the receiver 800 for descrambled broadcast waves when it has two tuner units, as opposed to the basic configuration of the receiver when it has one tuner unit shown in FIG. Is. The difference from FIG. 5 of FIG. 8 is that one tuner section is added and the first tuner section 801-1 and the second tuner section 801-2 are configured, and the tuner section is distributed to correspond to the two tuner sections. The point that the vessel 813 is added and the point that the built-in recording / recording unit 812 is added. The other 802 to 810 and 811 are the same as 502 to 510 and 511 in FIG.

The receiver 800 has two tuner units, a first tuner unit 801-1 and a second tuner unit 801-2, so that the program selected by one tuner unit is output to the monitor, and at the same time, another tuner unit is output. It is possible to record a program different from the program output to the monitor 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 when the broadcast wave of channel 1 to be output on the monitor is selected by the first tuner section 801-1 and the broadcast wave of channel 2 to be recorded by the recording / recording section 812 is selected by the second tuner section 801-2 at the same time. Will be explained.

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

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

The control unit 806 recognizes the PID of the EMM contained inside the CAT arranged in the selected broadcast wave, and receives the EMM. The control unit 806 determines the EMM addressed to itself from the received EMMs from the card ID information set in the unencrypted portion of the EMMs. When the control unit 806 extracts the EMM addressed to itself based on the card ID information, the control unit 806 transmits the EMM to the IC card 811. The IC card 811 that has received the EMM from the control unit 806 decrypts the encrypted EMM using the internal master key (Km), extracts the work key (Kw), and stores it.

Further, the control unit 806 receives the PMT of the service_id_1 to be tuned in with reference to the received PAT, recognizes the ECM PID contained in the received PMT, and receives the ECM. When the control unit 806 receives the ECM, the control unit 806 issues an ECM reception command to the IC card 811.

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

When the IC card 811 normally takes out the scrambled key (Ks), the IC card 811 transmits the scrambled key (Ks) to the control unit 806 as a normal response to the ECM reception command.

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

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

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

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

The control unit 806 recognizes the PID of the EMM contained inside the CAT arranged in the selected broadcast wave, and receives the EMM. The control unit 806 determines the EMM addressed to itself from the received EMMs from the card ID information set in the unencrypted portion of the EMMs. When the control unit 806 extracts the EMM addressed to itself based on the card ID information, the control unit 806 transmits the EMM to the IC card 811. The IC card 811 that has received the EMM from the control unit 806 decrypts the encrypted EMM using the internal master key (Km), extracts the work key (Kw), and stores it.

Further, the control unit 806 receives the PMT of the service_id_2 to be tuned in with reference to the PAT, recognizes the ECM PID contained in the received PMT, and receives the ECM. When the control unit 806 receives the ECM, the control unit 806 issues an ECM reception command to the IC card 811.

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

The processing of the IC card 811 starts the processing in response to a request from the receiver, but the exchange of data between the control unit 806 and the IC card 811 is a request from the control unit 806 to the IC card 811. Until the response from the IC card 811 to the control unit 806 is returned, the control unit 806 has a rule that the next request cannot be transmitted to the IC card 811.

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

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

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

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

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

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

When the receiver is equipped with three or more tuners, for example, when supporting the so-called W back recording function that can record two different channels at the same time other than the program being viewed, ECM processing and EMM processing become complicated. Become.

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

FIG. 9 is a basic configuration diagram of the receiver 900 when descramble the broadcast wave when having three tuners, as opposed to the basic configuration of the receiver when having two tuners shown in FIG. ..

The difference from FIG. 8 of FIG. 9 is that the third tuner unit 901-3 is added, and one IC card is added, and it is composed of 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 the same as those of 802 to 810 and 812 in FIG.

The broadcast wave of channel 1 to be output on the monitor is selected by the first tuner section 901-1, and the broadcast wave of channel 2 to be recorded by the recording / recording section 912 at the same time is selected by the second tuner section 901-2 and recorded at the same time. A process in which the broadcast wave of the channel 3 recorded by the recording unit 912 is selected by the third tuner unit 901-3 will be described.

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

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

The control unit 906 recognizes the PID of the EMM contained inside the CAT arranged in the selected broadcast wave, and receives the EMM. The control unit 906 determines the EMM addressed to itself from the received EMMs from the card ID information set in the unencrypted portion of the EMMs. When the control unit 906 extracts the EMM addressed to itself based on the card ID information, the control unit 906 transmits the EMM to either the predetermined first IC card 911-1 or the second IC card 911-2. The first IC card 911-1 or the second IC card 911-2 that received the EMM from the control unit 906 decrypts the encrypted EMM using the internal master key (Km) and extracts the work key (Kw). And save.

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

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

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

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

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

In the reserved recording, the user makes a desired program recording reservation of two different channels at the same time in an electronic program guide (EPG, not shown), and the control unit 906 sets the recording reservation for the program. When the start time is approached, the second tuner section 901-2 and the third tuner section 901-3 are controlled to select the channel reserved for recording.

The control unit 906 recognizes the PID of the EMM because it is included in the CAT arranged in the selected broadcast wave, and receives the EMM. , The control unit 906 determines the EMM addressed to itself from the received EMMs from the card ID information set in the unencrypted portion of the EMMs. 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 911-2 that received the EMM from the control unit 906 decrypts the encrypted EMM using the internal master key (Km) and extracts the work key (Kw). And save.

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

Since the IC cards 911-1 and 911-2 are guaranteed to process up to two channels simultaneously with one IC card by the operation regulations, the first tuner section 901-1 and the second tuner section 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 the setting screen such as the user interface. Yes (not shown).

For example, the first tuner unit 901-1 and the second tuner unit 901-2 are associated with each other so as to be processed by the first IC card 911-1 and the third tuner unit 901-1-3 to be processed by the second IC card 911-2. Shall be. In this case, a subscription contract is made to acquire the right to watch channels A, B, and C provided as pay broadcasting with the information of the card ID of the first IC card 911-1, and the card ID of the second IC card 911-2. When a subscription contract is made to acquire the right to watch channels D, E, and F provided as pay-TV with the information of, for example, when simultaneously recording channels A and F while watching channel C. If channel C is selected by the first tuner section 901-1, channel A is selected by the second tuner section 901-2, and channel F is selected by the third tuner section 901-3, the contracted pay broadcasting can be performed. Correspondence between the channel and the first IC card 911-1 and the second IC card 911-2 can be taken.

However, when the third tuner unit 901-3 tries to process the broadcast wave of channel A, the contract for viewing the broadcast wave of channel A is not contracted with the second IC card 911-2, so that 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. Also, if one IC card (CAS module) is contracted for three different channels (for example, channels A, B, C) and EMM is received, one of these three channels will not be viewed at different times. Although it is possible to record, it is possible to perform simultaneous processing of simultaneous recording of channels B and C while watching channel A. However, as described above, as described in Non-Patent Document 4, one IC is in a restricted state in which only one IC card can process TS of two channels (tuners) at the same time. There is a problem that the card cannot process TS of 3 different channels at the same time.

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

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

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

In this embodiment, one business entity newly sets one card ID in consideration of the ECM retransmission cycle, update cycle, command response performance, etc. described in the specifications of the CAS module (IC card). It specifies the frequency of EMM transmission or the number of EMMs that the receiver should process per entity within a certain period of time. That is, what is newly specified is the number of EMMs to be processed within a certain period, and whether the number of EMMs to be processed within a certain period is specified as a transmission rule or the number of EMMs to be processed within a certain period is specified as a receiver rule. Means. This makes it possible to strictly examine how many tuners can perform simultaneous reception processing with one CAS module (IC card). As a result, the convenience of the receiver manufacturer can be obtained.

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

(1b). Digital that specifies the minimum number of EMMs that need to be processed in the grace period from the receipt of EMMs to the issuance of commands to the CAS module among the EMMs and / or individual EMM messages sent to one CAS module ID. Broadcast transmitter / receiver.

(2). In broadcasting that operates an access control method (limited reception method or content protection method), when two or more receptions are viewed, recorded, or recorded at the same time, the ECM retransmission cycle, update cycle, and the same reception per business entity. The frequency of sending the EMM and / or EMM individual message to be sent to the machine (CAS module ID) is set, and the grace period from receiving the EMM and / or EMM individual message addressed to the receiver until issuing a command to the CAS module. A digital broadcast receiving device that controls the issuance schedule of the EMM and / or EMM individual message processing of each of the plurality of tuners mounted in the period from the EMM and / or EMM individual message transmission frequency to the CAS module.

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

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

(4). Above (1). In the description of, the frequency of sending an EMM and / or an EMM individual message addressed to one CAS module ID is specified by the number of EMMs to be transmitted in the grace period from receiving the EMM to issuing a command to the CAS module. Broadcast transmitter / receiver.

(5). Above (1). A digital broadcast transmission / reception device in which the frequency of sending an EMM and / or an EMM individual message addressed to one CAS module ID is specified by the number of EMMs and / or EMM individual messages to be transmitted per renewal cycle of the ECM or scramble key.

(6). Above (1). In the description of, the transmission frequency of the EMM and / or EMM individual message addressed to one CAS ID is transmitted in the grace period from the reception of the EMM and / or the EMM individual message to the issuance of the command to be executed for the CAS module. A digital broadcast transmitter / receiver specified by the number of EMMs and / or EMM individual messages to be used, and the number of EMMs and / or EMM individual messages to be transmitted per ECM or scramble key update cycle.

(7). Above (2). In the description of, the EMM to be transmitted is controlled in the issuance schedule to the CAS module during the grace period from the receipt of the EMM and / or the EMM individual message addressed to the CAS module to the issuance of the command to be performed to the CAS module. And / or a digital broadcast receiver controlled by the number of EMM individual messages.

(8). Above (2). In the description of, ECM or scramble is performed during the grace period from receiving the EMM and / or EMM individual message addressed to the CAS module to issuing the command to the CAS module to control the issuance schedule to the CAS module. A digital broadcast receiver controlled by the number of EMMs and / or EMM individual messages sent per key renewal cycle.

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

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

(11). Above (3). A digital broadcasting transmitter that controls the frequency of sending EMMs and / or EMM individual messages sent to the same receiver by the number of EMMs and / or EMM individual messages transmitted per Scramble key update cycle.

(12). Above (3). In the description of, the frequency of sending the EMM and / or the EMM individual message to be sent to the same receiver is the grace period from the reception of the EMM / EMM individual message to the CAS module to the issuance of the command to be executed to the CAS module. A digital broadcast transmitter controlled by the number of EMMs to be transmitted and the number of EMMs and / or EMM individual messages sent per ECM or scramble key update cycle during a period.

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

According to the conventional standards and operating regulations, it is necessary to consider the following in order to enable simultaneous processing of two different tuners in one CAS module (IC card). Therefore, when assuming a receiver with 3 or more tuners, in addition to the conventional standards and operational standards, commands with CAS modules (IC cards) such as ECM and EMM of the CAS modules (IC cards) to be mounted are used. It is necessary to understand the performance required for the response.

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

Generally, the ECM is updated every few seconds, so even if the retransmission cycle is sent every 100 ms, the ECM process must be prioritized when a plurality of tuners are mounted.

On the other hand, EMM has an attribute that does not require immediate processing as compared with ECM, but in some cases, although it is not as immediate as ECM, it may require processing as quickly as possible. for example,
(A) Viewer A, who wants to acquire the right to watch a program broadcast by a specific broadcasting station (business entity), calls the customer center of the subscribing broadcasting station (business entity) for procedures related to subscription and troubleshooting at the time of subscription. Then, according to the guidance of the telephone, the channel of the broadcasting station is selected by the self-receiver, and the card ID number of the receiver of the viewer A is announced. , The broadcasting station (business entity) immediately transmits the EMM set with the card ID number notified by telephone. (C) If the receiver of the viewer A receives the EMM and can take out the scramble key (Ks), It is possible to descramble the broadcast signal of the channel (so-called unlocking is possible).
(D) This allows Viewer A to confirm the completion of the contract procedure.
In the case of the scenes (a) to (d) above, although the EMM processing is not as immediate as the ECM, it is a reality that the processing may be required as quickly as possible.

In this way, when the business entity and the viewer make a telephone call and the viewer performs the viewing contract procedure while checking the reception status of the receiver, it is assumed that the receiver may make a mistake in receiving the EMM. Therefore, it is assumed that the broadcasting station (business entity) transmits the EMM with the same card ID in a burst for a certain period of time, assuming that the receiver makes a mistake in receiving 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 according to the renewal of the scramble key (Ks). The receiver does not control the reception of the EMM, receives all the EMMs sent to itself, and sends all the received EMMs to the CAS module (IC card) to request processing. It is believed that doing is the basis.

Therefore, it is desirable that the receiver processes the CAS module (IC card) with a certain period of time after receiving the EMM. Therefore, in the ARIB standard, the response performance of the CAS module (IC card) is shown by the CAS module provider, and the EMM reception command is issued to the CAS module (IC card) after the receiver receives the EMM. The grace period until the above is stipulated.

According to this regulation, assuming that the EMM is sent to the same CAS module (IC card) infrequently, the problem is practically less likely to occur, but as mentioned above, when the key is unlocked by telephone, etc. It is also expected that multiple EMMs will be sent in a short time.

Recently, the number of tuners installed has increased, and receivers equipped with a multi-channel recording function and CAS for high-bandwidth BS / CS broadcasting (so-called 4K8K broadcasting) are included in Appendix 7 of Part 1 of Non-Patent Document 5. It has been stipulated that the CAS of the current broadband satellite broadcasting (so-called 2K broadcasting) may be mounted on an integrated CAS module.

There is the following description in Appendix 7.
"Appendix 7 Shared Receivers for Current Broadcasting and Advanced BS Digital Broadcasting Reception of Advanced BS Digital Broadcasting and BS Digital Broadcasting / Broadband CS Digital Broadcasting specified in ARIB TR-B15 or Terrestrial Digital Television specified in ARIB TR-B14 The provisions for applying the same CAS module to the reception of BS digital broadcasting / wideband CS digital broadcasting and terrestrial digital television broadcasting at the time of shared reception capable of receiving at least one of John broadcasting are shown below. " ..

However, when the number of installed tuners is large in the receiver that receives the current wideband satellite broadcasting (so-called 2K broadcasting), or the receiver that receives the advanced wideband satellite broadcasting (so-called 4K8K broadcasting) and the current broadcasting (so-called 2K broadcasting) It is quite possible that one CAS module (IC card) will receive and process a large number of channels in the future.

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

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

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

In the triple key structure limited reception method shown in FIG. 4A, in addition to the technical regulation of the ECM update cycle of 2000 ms and the retransmission cycle of 100 ms, "EMM is one CAS module ID per business entity". However, it is assumed that the content of the regulation "send one in 30 seconds" is newly added.

FIG. 10 is a diagram showing the temporal relationship between the ECM, the EMM, and the scrambled key (Ks) in the limited reception method.

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 details of the temporal relationship between the scrambled key (Ks) included in the ECM and the scrambled key (ks) for descramble the broadcast signal using the included scrambled key (Ks) are shown in FIG. 4B. It's a street.

FIG. 11 shows the timing at which the transmitting side transmits the ECM including the scramble key (Ks) and the scramble key (Ks) included in the ECM, which is described in FIG. The timing of transmitting the video signal to be scrambled is illustrated. The horizontal axis is the time axis.

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

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

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

FIG. 12 is an implementation example of limited reception of the receiver in the transmission / reception system according to the transmission rule shown in FIG. 1201 is a temporal transition of the received program. The received program 1201 is scrambled at Ks0 until time T11, scrambled at Ks1 between times T11 and T12, scrambled at Ks2 between times T12 and T13, and scrambled at Ks3 between times T13 and T14. It shows that it is.

1202 is a temporal transition of the received ECM. The ECM2 is received at the timing of time T21, indicating that the ECM contains the scramble keys (Ks) Ks1 and Ks2. The above receiver is at time T21 while watching the program. Receives ECM2 and issues a command to the CAS module (IC card). The CAS module (IC card) completes the ECM processing between the times of the section T21 and the section T12. The CAS module (IC card) transmits the scrambled key Ks2 obtained by the ECM processing to the receiver, the receiver is set in the MULTI2 descrambler, and the scrambled program is transmitted from time T12 using Ks2. Desk rumble.

When switching from another channel between sections T22 and T13, the receiver receives the ECM3 and issues a command to the CAS module (IC card).

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

As shown in FIG. 7, the CAS module (IC card) conforming to Non-Patent Document 1 is expected to have a total value of ECM and EMM processing 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 can be processed by one CAS module (IC card)? , It will be possible after the following examination.

Assuming that the EMM addressed to the self-receiver is received between the sections T21 and T12, the EMM processing is not performed at the time of T21, so the receiver processes four ECMs at 1600ms between the sections T21 and T12. It is possible (case 1 in FIG. 12).

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

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

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

The above describes an example of the performance of the CAS module (IC card) and the EMM transmission frequency per business entity in the EMM processing grace period. Next, an embodiment in the case where one CAS module (IC card) processes more than two tuners in the receiver will be described.

FIG. 13 shows that the number of tuners is increased to three and the recording / recording section is increased with respect to the basic configuration of the receiver shown in FIG. 4.1, Volume 5 of Non-Patent Document 4 shown in FIG. It is an added block diagram.

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

The three tuner units may be either terrestrial digital television broadcasting, BS digital broadcasting, wideband CS digital broadcasting, or a tuner capable of three-wave channel selection, and can watch or record any three channels as receiver specifications.・ It shall be possible to record.

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

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

1401 is a temporal transition of the received program. The received program 1401 is scrambled at Ks0 until time T11, scrambled at Ks1 between times T11 and T12, scrambled at Ks2 between times T12 and T13, and scrambled at Ks3 between times T13 and T14. It shows that it is. 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. The ECM of each channel selected by the second tuner unit 1301-2 and the third tuner unit 1301-3 and the EMM of at least one of the channels can be processed.

As shown in FIG. 14, the EMM received by the first tuner unit 1301-1 is processed between the times T21 and T12, and the EMM received by the second tuner unit 1301-2 is processed between the times T22 and T13. , The EMM received by the third tuner unit 13010-3 may be processed between the 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 tuners) + (EMM response processing time = 500 ms) = 1400 ms ≦ 1600 ms.
In the IC card 1311, which is, processing is possible for three tuners.

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

When channel 1 (service_id_1) is selected by the operation of the remote controller 1310 by the user, the control unit 1306 receives the PAT extracted by the TS decoding unit 1303 to see if the PMT of the service_id is transmitted in the broadcast wave currently being received. To judge.

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

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

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

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

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

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

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

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

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

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

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

If the result of the determination is not transmitted, the control unit 1306 refers to the NIT sent from the TS decoding unit 1303 and selects the broadcast wave to which the service_id_2 of the program A is transmitted, so that the second tuner unit 1301- 2 is controlled.

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

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

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

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

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

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

When playing back the scheduled recorded program A or program B, the recorded program list is displayed on the user interface (not shown) shown on the screen, the program to be played is selected, and then the control unit 1306 records. -Read from the recording unit 1312, descramble with the key unique to the receiver, obtain the compressed video / audio signal, and then decode the compressed signal with the video / audio decoding unit 1304 to monitor or speaker (not shown). Output to.

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

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

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

FIG. 16 is a basic configuration diagram of the receiver 1600 when descrambled a broadcast wave when three tuner units are provided with respect to the basic configuration of FIG.

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

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

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

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

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

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

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

1701 is a temporal transition of the received program. The received program 1701 is scrambled at Ks0 until time T11, scrambled at Ks1 between times T11 and T12, scrambled at Ks2 between times T12 and T13, and scrambled at Ks3 between times T13 and T14. It shows that it is. 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 the times T21 and T12, and the EMM received by the second tuner unit 1601-2 is processed between the times T22 and T13. , The EMM received by the third tuner unit 1601-3 may be processed between the times T23 and T14. That is, in this case, the total processing time of the ECM and EMM of the CAS module 1611 is (ECM response processing time = 600 ms) × (3 tuners) + (EMM response processing time = 650 ms) = 2450 ms ≦ 7600 ms.
In the CAS module 1611, it is possible to process three tuners.

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

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

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

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

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

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

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

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

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

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

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

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

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

In the case of the reserved program D as well, similarly to the reserved program C, after the channel selection process is performed by the third tuner unit 1601-3, the program is stored in the recording / recording unit 1612.

When playing back the scheduled recorded program C or program D, the recorded program list is displayed on the user interface (not shown) shown on the screen, the program to be played is selected, and then the control unit records. After reading from the recording unit, descrambled with the above-mentioned receiver-specific key, and obtaining the compressed video / audio asset, the video / audio decoding unit 1604 decodes the compressed signal and monitors or speakers (not shown). Output to.

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

The receiver configuration of FIG. 18 is based on the basic configuration of the receiver described in Volume 5 of Non-Patent Document 4 which is a 2K broadcasting operation regulation, and the number of installed tuners is increased. Based on the basic receiver configuration described in Volume 5 of Document 5, it also has the configuration of FIG. 16 with an increased number of installed tuners, and has two tuners for 4K8K reception and two tuners for 2K reception. This is a basic configuration example of a receiver having three.

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

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

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

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

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

Since the receiver 1800 complies with Non-Patent Document 3, Non-Patent Document 4, and Non-Patent Document 5, the grace period from receiving the EMM addressed to itself to issuing a command to the CAS module 1811 is 30 seconds or less. do.

In addition, if the sender newly stipulates that "the frequency with which one business entity sends one EMM with one card ID set within the EMM processing grace period is one in 30 seconds", or a new reception As a rule on the machine side, "At least one EMM must be processed for the CAS module within 30 seconds after receiving the EMM addressed to the CAS ID of the own receiver per business entity.
If the receiver receives more than the specified EMM, it may be ignored or discarded. "Suppose that the provision is made.

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

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

1901 is a temporal transition of the received 4K8K program. The received program 1901 was received between times T11-4, between times T11-4 and T12-4, between times T12-4 and T13-4, and between times T13-4 and T14-4. It shows that they are scrambled with different scrambled keys (Ks). 1902 is a temporal transition of reception of ECM and EMM for the program of 1901. 1903 is a temporal transition of the received 2K program. The received program 1903 was received between times T11-2, between times T11-2 and T12-2, between times T12-2 and T13-2, and between times T13-2 and T14-2. It shows that they are scrambled with different scrambled keys (Ks). 1904 is a temporal transition of reception of ECM and EMM 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 of the 2K broadcast can be processed by the CAS module 1811 are verified.

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

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

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

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

That is, the first tuner section (4K8K) 1801-1 and the second tuner section (4K8K) 1801-2 can be processed within 7600 ms until the ECM is updated and the Ks of the broadcast signal is updated. As in the case, in the case of an entity whose channels selected by the first tuner section (4K8K) 1801-1 and the second tuner section (4K8K) 1801-2 are different, the first tuner section (4K8K) takes 30 seconds. ) 1801-1, it is necessary that at least one EMM transmitted on the channel selected by the second tuner unit (4K8K) 1801-2, that is, two can be processed.

From the above, first, the Ks update cycle of 2K broadcasting is shorter than the Ks update cycle of 4K8K, and in ECM and EMM, ECM requires immediate processing. Therefore, as a priority, when processing ECM in 2K broadcasting, processing for 3 tuners is performed within 1600 ms after each update of ECM, then processing of ECM in 4K8K broadcasting is performed, and then 2K broadcasting or 4K8K broadcasting is performed. It is appropriate to prioritize the processing of processing the EMM in. It is verified whether the processing using one CAS module 1811 is possible with the above processing priorities.

As the most severe case, 5 tuner parts (1st tuner part (4K8K) 1801-1, 2nd tuner part (4K8K) 1801-2, 3rd tuner part (2K) 1801-3, 4th tuner part (2K) 1801 -4, In the program received by the tuner unit (2K) 1801-5), the case where the update timings of the scramble keys (Ks) match will be described as an example.

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

Since the ECM response time of the 4K8K broadcast is 600 ms in this example, the 4K8K ECM can be processed at 1600-900 = 700 ms in the section up to the time T12-2 of the update timing of the scramble key (Ks) of the 2K broadcast. 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 from the end of this response process to the next ECM update timing time T22 of the 2K broadcast. Since it is only 500 ms, it is too short to process the ECM of 4K8K broadcast.

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

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

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

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

Next, in the Ks update timing T13-4 or later of 4K8K broadcasting, the difference from the timing T12-4 or later is that the fifth tuner section (2K) 1801-5 is used instead of the EMM processing of the fourth tuner section (2K) 1801-4. EMM processing is performed. The number of 4K8K tuners installed is two in this example, and EMM processing is not required.

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

As described above, even when the CAS module for 2K broadcasting and the CAS for 4K8K broadcasting are integrated and the Ks update cycle for 2K broadcasting and 4K8K broadcasting is different, the ECM update cycle and the EMM processing grace period are added. By defining the minimum number of EMMs required to be processed per business entity within the EMM processing grace period, it is possible to control the processing timing without missing the ECM or EMM processing.

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

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

FIG. 20 is an implementation example of limited reception 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 until the time T12 excluding the EMM processing time is 1600 ms-EMM processing time 400 ms = 1200 ms, and since it is necessary to perform ECM processing at this time, up to 4 tuners can be mounted. ..

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

In the example of FIG. 20, if the margin of 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. In 30 seconds, up to 30 EMMs can be processed.

However, under conditions different from the above operation, for example, among the conditions of the above example (Example 2), it is possible to transmit 8 times in 30 seconds for one ID per business entity which is the transmission frequency of EMM. If it is specified that there is a property (Example 3), a maximum of 32 EMMs (for 8 x 4 tuners) will be sent in 30 seconds with 4 tuners, and in terms of desk calculation, the Ks update cycle is per 2000 ms. 2 EMMs can be processed in, and up to 30 EMMs can be processed in 30 seconds, but up to 32 EMMs may be sent, so 2 EMMs cannot be processed. ..

Therefore, even if ECM processing is possible, considering the processing capacity of EMM, it is possible to process up to 3 tuners, that is, processing 24 EMMs in 30 seconds.

In the actual design, the EMM or ECM at the receiver is designed in consideration of the margin such as the time taken out from the multiplexed broadcast wave.

The above method of defining the frequency of EMM is the number of tuners that receive the EMM addressed to the ID of the CAS module (IC card) mounted on the receiver and then send it to the CAS module (IC card) per grace period. However, the method of specifying is not limited to this, and the frequency of sending EMM per business entity and one card ID may be quantitatively specified.

For example, the frequency of sending EMM per business entity and one card ID per Ks update cycle may be used. For example, the maximum number of EMMs transmitted from one business entity to one card ID per 2000 ms is a maximum of two.

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

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

Therefore, the method of specifying the frequency of the EMM and the EMM individual message may be a method of specifying the EMM and the EMM individual message with the same frequency, or a method of specifying the EMM and the EMM individual message with different frequencies. For example, the method of stipulating that "the maximum number of EMM / EMM individual messages sent to the same receiver is two in 30 seconds per business entity" is the case where the same frequency is stipulated. The number of "maximum 2" is not limited to this value as it is determined in consideration of the actual performance of the CAS module. Further, an example in which the frequency of EMM and EMM individual message is specified individually is shown.

"The maximum number of EMMs sent to the same receiver is 2 in 30 seconds per business entity, and the maximum number of individual EMM messages sent to the same receiver is 3 in 30 seconds per business entity." And the EMM individual message can be changed depending on the width of the sending time. "The maximum number of EMMs sent to the same receiver is 2 in 30 seconds per business entity, and the maximum number of individual EMM messages sent to the same receiver is 3 in 2 seconds per business entity."
In this example, the EMM is specified for 30 seconds together with the update cycle of the transmission frequency scramble key (Ks) of the EMM individual message.

In this way, the frequency of EMM and / or EMM individual messages is necessary for determining the number of tuners and examining the processing margin of the control unit of the receiver in a receiver equipped with two or more tuners. On the other hand, regarding the frequency, the method of applying for subscription of the broadcaster, for example, the method of accepting by telephone and sending immediately without hanging up as described above, or the method of sending immediately without sending immediately, by telephone or online It is possible to specify according to the actual situation of operation, such as when EMM is sent within a certain period of reception (for example, within 30 minutes).

The above is an example in which the EMM (including individual EMM messages) transmission frequency is specified in the operation regulations, but assuming that the EMM is missed by the receiver, the same EMM may be retransmitted in a short time as an actual operation. Is assumed. Therefore, in the operation regulation, there is also a method of specifying the minimum number of EMMs to be received and processed within the grace period for the CAS module after receiving the EMM. For example, "The number of receivers that have received EMM / EMM individual messages addressed to the same receiver should request processing from the CAS module is at least one in 30 seconds per business entity. This is set in 30 seconds. EMMs that exceed the limit may be discarded. ”, Etc., specify the minimum number of EMMs to be processed by the receiver in the EMM processing grace period, and the EMM addressed to the receiver (CAS ID) received within the processing grace period is , It is a method that you can discard anything that exceeds the regulation.

As described above, the receiver processes the CAS module (IC card) after receiving the EMM or EMM individual message addressed to itself (to the card ID of the CAS module inserted in the receiver). It is easy to understand how many EMMs need to be processed in the grace period until the request is made, but it is not limited to this, and it is addressed to oneself per unit time per business entity. It suffices to specify the frequency of sending EMMs and individual EMM messages, and the number of EMMs required to be processed by the receiver.

In addition, in consideration of the demand for receivers equipped with multi-channel tuners and the demand for receivers equipped with 2K, 4K, and 8K in the regulations already in operation, it is assumed in the past to enable strict receiver design. In order to specify the EMM and the EMM individual message transmission frequency without contradiction, it is possible to go through the examination process opposite to the above.

For example, in the implementation example of the limited reception of the receiver shown in FIG. 20, if it is implicitly understood that four tuners can be installed, the receiver is addressed to itself (CAS inserted in the receiver). After receiving the EMM (to the card ID of the module), up to 24 EMM processes can be processed for the CAS module (IC card) within the grace period of 30 seconds, and from 24/4 = 6, By stipulating that "a maximum of 6 EMMs can be sent per 30 seconds (grace period of EMM processing) for one CAS ID per business entity", without overturning the previous implicit matter. It can be specified. Of course, the number of 6 or less may be any number as long as it is an integer of 6 or less.

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

Further, this embodiment is mainly defined in Non-Patent Document 5, which is a broadband satellite broadcasting specified in Non-Patent Document 4, a terrestrial digital television broadcasting specified in Non-Patent Document 3, and an advanced broadband satellite broadcasting, so-called 4K8K broadcasting. In addition to the ECM update cycle and retransmission cycle, the number of EMMs sent within the grace period after receiving the EMMs addressed to the CAS ID mounted on one receiver addressed to the CAS ID per business entity. Alternatively, the exact same effect can be obtained by specifying the minimum number of EMMs to be processed within the EMM processing grace period. Needless to say, the package shape of the CAS module is not limited to the IC card, and the shape of the IC chip does not change at all.

In the receiver shown in FIG. 18, FIG. 21A shows the first tuner (4K8K) 1801-1, the second tuner (4K8K) 1801-2, the third tuner (2K) 1801-3, and the fourth tuner (2K) 1801. -4, an example of a time chart in which ECM and EMM are received from the 5th tuner (2K) 1801-5 is shown. The receiver 1800 receives the ECM and the EMM at the time indicated by the arrow, respectively. After receiving EMM2121 from the second tuner (4K8K) 1801-2, ECM2110 from the first tuner (4K8K) 1801-1, ECM2120 from the second tuner (4K8K) 1801-2, and ECM2120 from the first tuner (4K8K) 1801-1. From EMM2111, from the third tuner (2K) 1801-3 to ECM2130, from the fourth tuner (2K) 1801-4 to ECM2140, from the third tuner (2K) 1801-3 to EMM2131, from the fifth tuner (2K) 1801. It shows that ECM2150 is received in order from -5. The horizontal axis is the time axis.

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

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

For example, 2160 represents the time that the CAS module is processing the EMM2121. 2161 represents the time that the CAS module is processing the ECM2110. 2162 represents the time that the CAS module is processing the ECM2120. 2163 represents the time during which the CAS module is processing the EMM2111. Further, FIG. 2102-1 shows that the CAS module processes EMM2121, ECM2110, ECM2120, and EMM2111 in this order.

FIGS. 2102-1, 2102-2, and 2102-3 confirm that when the control unit 1806 receives the EMM2121, there is no other high-priority buffer, and the control unit 1806 is connected to the integrated CAS module 1811. It is a figure which considered the processing of the CAS module when the processing was received in the order of 2110, 2120, 2111, 2130, 2140, 2131, and 2150 immediately after the processing was started. 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 discussion, in order to consider under the worst conditions, 2102-1, 2102-2, and 2102-3 are examples in which the processing of 2160, which is the processing of 2121, is performed first.

2102-1 represents the processing order when the receiver processes the ECM and EMM for the timing reception. In this example, the ECM2130, which must be originally processed within 1600 ms, which is the time from the reception timing of the ECM to the timing of receiving the broadcast signal descrambled using the scramble key (Ks) included in the ECM. , ECM2140, ECM2150 indicates that the processing has not been completed.

Therefore, "4.1 (8)" described in Non-Patent Document 4
-Regarding the EMM reception command and EMM individual message reception command, the receiver issues a command to the IC card within 30 seconds after receiving the EMM and 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 according to the above and the EMM processing and the EMM individual message processing are delayed. 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 of 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) = 2750ms
Therefore, among the 2K ECMs, the processing of the ECM2150 received by the receiver at the end 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 Receivers for Current Broadcasting and Advanced BS Digital Broadcasting”, it is necessary to further devise the processing order of ECM and EMM. It becomes.

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

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

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

First, a buffer for performing ECM and EMM processing will be described. When the control unit 1806 shown in FIG. 18 receives the ECM or EMM from the MMT multiplex separation unit 1803-1 or the TS decoding unit 1803-2, the control unit 1806 requests the CAS module 1811 to process the ECM and EMM, so that the processing request transmission process is performed. Is started (S2200).

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

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

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

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

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

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

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

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

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

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

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

Next, "At least one EMM must be processed for the CAS module within 30 seconds after receiving the EMM for which the card ID addressed to oneself is set per business entity. More EMMs are used. An example is shown in the case where processing is performed in accordance with the provision of "If it is received, it may be ignored or discarded."

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

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

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

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

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

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

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

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

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

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

As a result of the confirmation, when there is data waiting for request transmission in the CAS card module 1811 in the EMM reception buffer (Yes of 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 exceeds 30 seconds (Yes in S2404), the data of the corresponding EMM is cleared (S2405). After clearing the data (S2405), the control unit 1806 returns to S2401 again to continue the process.

If the elapsed time of the confirmation result is not less than 30 seconds (No in S2404), the control unit 1806 issues a processing request command to the CAS module and waits for the response (S2406). When the control unit 1806 receives 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 reception buffer (S2401), the control unit 1806 ends the process when there is no data waiting for request transmission in the CAS card module 1811 (No of S2402) in the EMM reception buffer (S2403). ).

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

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 flowchart as shown in FIG. 24, for example, the EMM buffer managed for each business entity and waiting for processing. It is also conceivable that the reception time is determined, and if the EMM received within 30 seconds already exists in the EMM buffer, the EMM received later is discarded.

FIG. 25 shows the processing flowchart shown in FIG. 24 when “the EMM managed for each business entity, the reception time of the EMM buffer waiting to be processed is determined, and the EMM received within 30 seconds already exists in the EMM buffer. It is a processing flowchart of EMM reception of a receiver when the provision of "discarding EMM received later" is added.

Similarly, FIG. 18 will be described as an example. When the control unit 1806 receives the EMM from the MMT multiplex separation unit 1803-1 or the TS decoding unit 1803-1, the control unit 1806 starts the EMM reception process for storing the received EMM in the EMM reception buffer (S2500).

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

The control unit 1806 refers to the business entity of the received EMM data, and confirms whether 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 passed from the reception time of the stored data (S2502).

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

If 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 business entity is not stored (No of S2501), the control unit 1806 saves the received EMM in the buffer (S2504) and ends the process (S2505).

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

In TR-B39 Vol. 5, "4.9.3.1 EMM Section and EMM Individual Message Section Transmission Frequency", "EMM / EMM individual messages addressed to the same receiver are not sent centrally in order to reduce the processing load on the receiver. Therefore, the maximum number of EMMs or individual EMM messages sent to the same receiver is 8 per 8 seconds. ] Is stipulated. This regulation is not applicable to all 8K, 4K, and 2K tuners installed in the EMM addressed to the CAS module ID of the receiver at the same time during the EMM processing grace period (example: 30 seconds). , EMM received 8 times in 8 seconds other than ECM processing may be possible within the EMM processing grace period (example: 30 seconds) after receiving EMM, but it depends on the EMM transmission timing with the on-board tuner 4K (or 8K). ) Even if the tuner can receive 8 EMMs in 8 seconds, it may not be processed in 30 seconds after reception. Originally, 8 EMMs should be sent every 30 seconds in order to perform EMM processing without being missed by the receiver, but if the broadcaster allows, 8 EMMs received in 8 seconds are EMMs. Do not discard even after the processing grace period (30 seconds), perform at least one EMM process every 30 seconds, process one cached eight EMMs in the EMM grace period (eg 30 seconds), and grace at the latest. Since the purpose of the present invention can be achieved even if processing is allowed within the period × 8 (example: 240 seconds), 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 allow transmission and reception, taking into account the performance of the CAS module so that the receiver can perform EMM processing without missing it.

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

As can be understood from the above description, the above-described embodiment has, of course, a function as a receiver and a feature as a transmitter and a transmission / reception system. Further points in the above-described embodiment will be summarized below.
(1) The maximum number of EMM / EMM individual messages sent to the same receiver is M (see * 2 below) per business entity in 30 (see * 1) seconds.
(2) The maximum number of EMM / EMM individual messages sent to the same receiver is M (see * 2 below) per entity in 30 (see * 1 below) seconds, and M2 (see * 3 below) seconds. (See * 2 and 4 below).
(3) The maximum number of EMM / EMM individual messages sent to the same receiver is M2 (see * 2 and 4 below) per entity in 2 (see * 3 below) seconds.
(4) The maximum number of EMMs sent to the same receiver is 30 per business entity (see * 1 below) per second (see * 2 below), and the number of individual EMM messages is 30 per business entity (see * 1 below). ) Maximum M3 per second (see * 2.5 below).
(5) The maximum number of EMMs sent to the same receiver is M (see * 2 below) per business entity in 30 seconds (see * 1 below), and the number of individual EMM messages is 2 per business entity (see * 3 below). ) Maximum M3 per second (see * 2 and 5 below).
The maximum number of EMMs sent to the same receiver is M * 2 per entity in 2 (see * 3 below) seconds, and the maximum number of individual EMM messages is M3 (see * 1 below) per entity in 30 seconds (see * 1 below). * Refer to 2.5).
* 1 ... 30 seconds is the grace period until the CAS is processed after receiving the EMM / EMM individual message specified in the current operation regulations.
* 2: The number of TR-B14 and B15 is the same, and the number of TR-B39 is different.
* 3 ... 2 seconds is the operation regulation TR-B14 for the current broadcast (2K), ECM (Ks) update cycle for TR-B15, 8 seconds for altitude BS / CS (4K8K) TR-B39,
* 4 ... M2 is when the value of M is 3 or more, and when it is necessary to specify the case of sending in burst within one Ks update cycle,
* 5 ... The response time performance of EMM and CAS of individual EMM messages is actually different. In the case of a draft regulation that takes into account the business operator's desire to change the frequency with EMM, although the operation of individual EMM messages is small.

Further, various effects can be obtained as described below depending on the configuration of the receiver described above. That is,
(B1)
Receives at least the first control information (EMM) including the encrypted first key (Kw), the second control information (ECM) including the encrypted second key (Ks), and the service signal including the scrambled content. The tuner unit, the descrambler that receives the scrambled content output from the tuner unit, at least the tuner unit, the control unit that controls the descrambler, and the first control information (EMM) that is controlled by the control unit. ), The first key (Kw) is acquired using the unique third key (Km), and the first key (Kw) acquired from the second control information (ECM) is used to obtain the first key (Kw). It is equipped with a CAS module that acquires the second key (Ks) to be given to the descrambler.
The control unit
It is set that the minimum R (integer of 1 or more) should be processed within the processing grace period to the CAS module after receiving the EMM specified in the regulation for the first control information (EMM) per business entity. After detecting the first control information (EMM) of the one business entity and then performing R processing within the grace period of the EMM processing, the first control information next to the one business entity is performed. When (EMM) is detected, a receiving device that suppresses command transmission to the card unit for the first control information (EMM) within at least the grace period.

According to the configuration of (B1) above, even if it is exactly one CAS module, it is possible to watch a contract program without missing the ECM and EMM processing required for descramble. Alternatively, a transmitter or transmitter / receiver) can be provided.
(B2)
In the receiver, the control unit receives the first control information (EMM) depending on whether the tuner unit receives terrestrial digital television broadcasting or BS digital broadcasting / wideband CS digital broadcasting. ) Is sent to the same frequency, or the number of processing obligations of the first control information (EMM) is the same, in order to determine the frequency or the number. The first control information (EMM) is processed by sharing the same information.

According to the configuration of (B2) above, there is an advantage that the number of EMM frequencies (processing obligations) of TR-B14 and TR-B15 is the same. In other words, TR-B14 and TR-B15 are standard specifications for 2K TV with a 3-wave shared machine of terrestrial digital broadcasting, BS, and 110CS, and per business entity regardless of broadcasting media (terrestrial digital broadcasting, BS, 110CS). If the EMM processing frequency regulation is the same, the mounting conditions will not be complicated in CAS processing. Under the same conditions, if verification is easy at the receiver development stage and the number of transmissions is specified, TR-B14 and B15 use the same B-CAS method, and EMM transmission equipment can be standardized.
(B3)
The control unit determines whether the tuner unit is receiving terrestrial digital television broadcasting or advanced broadband satellite digital broadcasting.
On the premise that the frequency of sending the first control information (EMM) is different within the grace period (for example, 30 seconds), or 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 and the number.

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

According to the configuration of (B4) above, even if the command response performance of EMM and ECM in the TR-B39 compliant CAS module is different from the command response performance of the IC card based on TR-B14,15, it is TR-B39 compliant. Other EMM frequencies can be set according to the performance of the CAS module. Since EMM can be acquired via the communication path with TR-B39, the frequency setting is different from TR-B14 and TR-B15, which can only transmit EMM of broadcast waves only. (Reduce the number of TR-B39), TR-B39 is targeted for later digital broadcasting compared to 2K broadcasting such as TR-B14 and TR-B15, so it can be used for new 4K8K pay broadcasting subscribers. In order to improve the service, it is possible to increase the number of EMM transmissions for a certain period of time, and even if the EMM is missed by the receiver, receive the EMM as soon as possible to shorten the time from application for subscription to unlocking (EMM reception). It is possible. Further, in TR-B39, it is possible to set the priority by the EMM acquisition via the communication path and the EMM acquisition by the broadcast wave, for example, in order to immediately unlock for paid viewing via the communication path. Needless to say, raising the priority of processing EMM via communication next to ECM is also effective in terms of user convenience.
(B5)
In the control unit, there are cases where the tuner unit is receiving terrestrial digital television broadcasting, BS digital broadcasting / wideband CS digital broadcasting, and advanced broadband satellite digital broadcasting. , The frequency of sending the first control information (EMM) is the same, or 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 frequency or the determination of the number.

According to the configuration of (B5) above, the processing at the receiver is simplified. The same EMM processing timing is possible regardless of the reception network (terrestrial digital broadcasting, 2KBS, 2KCS, 4K8KBS, 4K110CS).
(B6)
In the control unit, there are cases where the tuner unit receives BS digital broadcasting / wideband CS digital broadcasting and a first case where the tuner unit receives advanced broadband satellite digital broadcasting.
The frequency is based on the premise that the frequency at which the first control information (EMM) is sent is the same, or the number of processing obligations of the first control information (EMM) is the same. Alternatively, the first control information (EMM) is processed by sharing the information of the determination of the number.
In the second case where the tuner unit receives the terrestrial digital television broadcast, the first control information (the first control information (the information for determining the frequency or the number) is different from that in the first case. EMM) is processed.

According to the configuration of (B6) above, the frequency at which EMMs are sent is different from TR-B14, and B15 and B39 have the same frequency. TR-B15 and TR-B39, which include pay-TV, and terrestrial digital broadcasting (divided by TR-B14), which has virtually no pay-TV, have the same advantages as (B3) above. Further, by setting the frequency of TR-B14 to be low, there is a high possibility that the number of terrestrial digital tuners mounted can be increased.
(B7)
The tuner unit receives the first control information (EMM) corresponding to the one business entity and an EMM individual message transmitted for each receiver and indicating a pointer of an automatic display message.
Receive EMM individual messages,
The control unit processes the first control information (EMM) corresponding to the one business entity and the EMM individual message separately.

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

According to the configurations of (B7) and (B8) above, the number of EMM frequencies (processing obligations) of EMM and EMM individual messages is different. As a result, it is fully assumed that the CAS module response performances of the EMM and the EMM individual message are different, the response time is short, the size of the EMM individual message is predicted to be smaller than that of the EMM, and the response performance is assumed to be short. Therefore, it is possible to specify that the frequency is higher than that of EMM. In addition, compared to EMM, the EMM individual message is an individual part (for example, the name of the subscriber) for each ID of the EMM mail or the automatically displayed message, and it is considered that the actual usage frequency is low, and the contract is being called. Since it is difficult to require immediacy such as confirmation, reduce the frequency of EMM, that is, set the number in a span longer than the EMM processing grace period, or reduce the number even in the same processing grace period to process EMM and ECM. It is expected that the time to turn to will increase as an advantage.
(B9)
The frequency of the first control information (EMM) is set according to the processing grace period of the first control information (EMM).

According to the configuration of (B9) above, the EMM frequency is determined by the EMM processing grace period, whereby the number of EMMs required at any time within the grace period is processed, for the purpose of setting the grace period. It can be said that it is a profitable setting method. Even when considering the flow of the receiver, the degree of freedom increases 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 configuration of (B10) above, the EMM frequency is determined by the Ks update cycle. The EMM processing grace period is currently 30 seconds, and the Ks update cycle is shorter. In the receiver, when examining the filtering performance of EMM, it is meaningful to specify the number of EMMs in a short time in terms of how much EMM addressed to oneself may come in a short time. However, the business operator may issue a plurality of EMMs in a short time. Issuing multiple EMMs in a short time is effective when the receiver makes a mistake in acquiring the EMM, or when you want to acquire the EMM as soon as possible and you want to send the same EMM in a short time. However, if only the EMM transmission rate is used, the EMM cache area will increase as long as the processing grace period (30 seconds) setting remains, so the number is used to estimate the EMM temporary cache area instead of the transmission rate. The provisions of are 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,
According to the configuration of (B11) above, in the configuration of (B11), the EMM frequency is determined by the Ks update cycle. If you want to receive one in 30 seconds, but you want to receive it as soon as possible, for example, "The receiver needs at least one process per enterprise in 30 seconds. However, the EMM is sent. If it is stipulated that "EMMs are sent at a rate of 2 in 2 seconds, but after receiving the EMMs, the EMMs acquired in the following 30 seconds do not have to be discarded or received", 1 piece in the processing grace period of 30 seconds. Since it is sufficient, the remaining time can be used for EMM and ECM processing of other tuners, and by sending a large amount of EMM for a certain period of time, EMM reception becomes possible faster, and the viewer can confirm the contract in a shorter time. In addition, the receiver side can also estimate the amount of temporary EMM cache.

In addition to the above points, in the present embodiment, the broadcast signal transmission system described below.
Elements are also included, that is,
(C1)
On the receiving side
Receives at least the first control information (EMM) including the encrypted first key (Kw), the second control information (ECM) including the encrypted second key (Ks), and the service signal including the scrambled content. The tuner unit, the descrambler that receives the scrambled content output from the tuner unit, at least the tuner unit, the control unit that controls the descrambler, and the first control information (EMM) that is controlled by the control unit. ), The first key (Kw) is acquired using the unique third key (Km), and the first key (Kw) acquired from the second control information (ECM) is used to obtain the first key (Kw). The CAS module (IC card) for acquiring the second key (Ks) to be given to the descrambler is provided, and the frequency with which the first control information (EMM) is transmitted by the transmission equipment per business entity is EMM. A broadcast signal transmission system that sets the minimum number of R (integer of 1 or more) within the processing grace period (30 seconds).
(C2) In terrestrial digital television broadcasting and BS digital broadcasting / wideband CS digital broadcasting,
It is assumed that the transmission equipments transmit the first control information (EMM) at the same frequency, or the number of processing obligations of the first control information (EMM) is the same.
The broadcast signal transmission system according to C1, wherein the receiving side can process the first control information (EMM) by sharing information for determining the frequency or the number.
(C3) In terrestrial digital television broadcasting and advanced broadband satellite digital broadcasting, the frequency at which the first control information (EMM) is transmitted by the transmission equipment is different within the EMM processing grace period (30 seconds), or , The number of processing obligations of the first control information (EMM) is different, so that the receiving side can process the first control information (EMM) by making the information for determining the frequency or the number different. The broadcast signal transmission system according to C1.
(C4) In terrestrial digital television broadcasting, BS digital broadcasting / wideband CS digital broadcasting, and advanced broadband satellite digital broadcasting, the transmission equipment of each of the transmission equipment within the EMM processing grace period (30 seconds) is the first control information (EMM). ) Is sent differently, or the number of processing obligations of the first control information (EMM) is different, and the receiving side has different information for determining the frequency or the number of the first control information (EMM). The broadcast signal transmission system according to (C1) above, which is capable of processing control information (EMM).
(C5) In BS digital broadcasting / wideband CS digital broadcasting and advanced broadband satellite digital broadcasting, the frequency at which the transmission equipment transmits the first control information (EMM) is the same, or the first control Assuming that the number of information (EMM) processing obligations is the same, the receiving side can process the first control information (EMM) by sharing the information of the determination of the frequency or the number of information (EMM). The broadcast signal transmission system according to C1).
(C6) In the first case of BS digital broadcasting / wideband CS digital broadcasting and advanced broadband satellite digital broadcasting, the transmission equipment of each has the same frequency of sending the first control information (EMM). Or, assuming that the number of processing obligations of the first control information (EMM) is the same, the receiving side shares the information of the determination of the frequency or the number, and processes the first control information (EMM). In the second case of terrestrial digital television broadcasting on the receiving side, the information for determining the frequency or the number is different from that of the first case, and the first control information ( The broadcast signal transmission system according to (C1) above, which is capable of processing EMM).
(C7) The transmission facility transmits an EMM individual message indicating the first control information (EMM) corresponding to the one business entity and a pointer of an automatic display message transmitted for each receiver, and the receiving side receives the EMM individual message. The broadcast signal transmission system according to (C1), wherein the first control information (EMM) corresponding to the one business entity and the EMM individual message are processed separately.
(C8) The transmission equipment sends an EMM individual message indicating the first control information (EMM) corresponding to the one business entity and a pointer of an automatic display message transmitted for each receiver, and the receiving side sends the EMM individual message. Assuming that the frequencies of the first control information (EMM) and the EMM individual messages 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 messages are set. The broadcast signal transmission system according to (C1) above, wherein the information for determination is different so that the first control information (EMM) and the EMM individual message can be processed.
(C9) The broadcast signal according to any one of C1 to C8, wherein the frequency of the first control information (EMM) is set according to the processing grace period of the first control information (EMM). Transmission system.
(C10) The frequency of the first control information (EMM) is any one of C1 to C8, which is set based on the update cycle of the second key (Ks) of the first control information (EMM). The broadcast signal transmission system according to 1.
(C11) The frequency of the first control information (EMM) is set to a processing grace period of the first control information (EMM) and an update cycle of the second key (Ks) of the first control information (EMM). The broadcast signal transmission system according to any one of C1 to C8, which is set based on the above.

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 embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof. Furthermore, in each of the constituent elements of the claim, even if the constituent elements are divided and expressed, a plurality of the constituent elements are expressed together, or a combination thereof is expressed, it is within the scope of the present invention. Further, a plurality of embodiments may be combined, and examples composed of these combinations are also within the scope of the invention.

Further, in order to clarify the description, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the actual embodiment, but this is merely an example, and the present invention is provided. It does not limit the interpretation. Further, in the present specification and each figure, components exhibiting the same or similar functions as those described above with respect to the above-mentioned figures may be designated by the same reference numerals, and duplicate detailed description may be omitted as appropriate. .. Further, the apparatus of the present invention is applied even when the claim is expressed as a control logic, when it is expressed as a program including an instruction for executing a computer, and when it is expressed as a computer-readable recording medium in which the instruction is described. be. Further, the names and terms used are not limited, and other expressions are included in the present invention as long as they have substantially the same contents and the same purpose.

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

Claims (1)

The first tuner unit receives the first service signal transmitted by the first business entity of BS digital broadcasting, and transmits the first scrambled content included in the first service signal at a predetermined frequency. The first a control information (EMM) of the first entity, including the encrypted first a key (Kw), is updated in the first cycle and is shorter than the first cycle and less frequently than the predetermined frequency. Receiving the second a control information (ECM) of the first business entity including the encrypted second a key (Ks) transmitted in the cycle of
The second tuner unit receives the second service signal transmitted by the second business entity of CS digital broadcasting, and transmits the second scrambled content included in the second service signal at a predetermined frequency. The first b control information (EMM) of the second entity, including the encrypted first b key (Kw), is updated in the third cycle and is shorter than the third cycle and less frequently than the predetermined frequency. Receiving the second b control information (ECM) of the second entity, including the encrypted second b key (Ks) transmitted in the cycle of
The descrambler descrambles the first scrambled content output from the first tuner unit.
The 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.
The first a control information (E) is based on the packet ID included in the predetermined table.
MM), the second a control information (ECM), the first b control information (EMM), the second b control information (ECM), the first tuner unit, the second tuner unit, and the descrambler. To control,
The CAS module is controlled by the control unit, and obtains the first a key (Kw) from the first a control information (EMM) of the first business entity using a unique third key (Km). Using the acquired first a key (Kw) from the second a control information (ECM) of the first business entity, the second a key (Ks) to be given to the descrambler is acquired.
The CAS module is controlled by the control unit, and the first b key (Kw) is acquired from the first b control information (EMM) of the second business entity using a unique third key (Km). , The second b key (Ks) to be given to the descrambler is acquired by using the acquired first b key (Kw) from the second b control information (ECM) of the second business entity. , With
Further, the control unit
The first a control information (EMM) of the first business entity, the second a control information (ECM) of the first business entity, the first b control information (EMM) of the second business entity, the first The second b control information (ECM) of the second business entity is stored in the buffer, and the second b control information (ECM) is stored in the buffer.
The first a control information (EMM) in units of the first business entity of the BS digital broadcasting.
Is received, and then the first command transmission corresponding to the first a control information (EMM) is transmitted to the CAS.
As the period to be performed on the module, 30 seconds is set as the first period longer than the first period, and the first a control information (EMM) is set to the minimum Ra (integer of 1 or more) in the first period. ) Set what should be processed individually,
Performing a second command transmission corresponding to the first said period of first the 2a control information of the first entity stored in received the buffer by the tuner unit (ECM) to the CAS module , the predetermined number of transmitting said first command corresponding to the 1a control information stored in the buffer (EMM) during the time of treatment except with the transmitting the second command in the first period to the CAS module By doing so, the first Ra (integer of 1 or more) of the first a control information (EMM) is processed in the first period.
The 1b control information (EMM) in units of the second business entity of the CS digital broadcasting.
Is received, and then the first command transmission corresponding to the first b control information (EMM) is transmitted to the CAS.
As the period to be performed on the module, 30 seconds is set as the second period longer than the third period, and the first b control information (EMM) is set to the minimum Rb (1 or more) in the second period. Set what should be processed (integer),
The second received by the second tuner unit and stored in the buffer during the second period.
The 2b performs second command transmission corresponding to the control information (ECM) to the CAS module, the buffer during the time of processing other than that caused by transmitting the second command in the second period of the entities By transmitting a predetermined number of the first commands corresponding to the first b control information (EMM) stored in the CAS module to the CAS module, the first b control information (EMM) can be reduced to the minimum Rb (EMM) in the second period. Process 1 or more integers) and
Above discard the first 1a control information remaining in the buffer (EMM) after a lapse of the first period the the 1a control information of the first entity (EMM) from the stored in the buffer ,
To discard the remaining claim 1b control information (EMM) in the buffer after the lapse of the second period the claim 1b control information of the second entity (EMM) from the stored in the buffer , Receiving method.

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