JP7423833B2 - Receiving machine - Google Patents

Description

Embodiments relate to a receiver, a reception method, and a system.

In digital broadcasting, ARIB STD-B10 stipulates that a Time Offset Table (TOT) is transmitted in order to provide information regarding the current time and date and offset time information when daylight saving time is implemented. The modified Julian date (MJD) transmitted by TOT is expressed in 16 bits, and the future date is 0xFFFF, which is April 22, 2038. In order to support data beyond April 23, 2038, related standards define a method (extended MJD) that extends until February 28, 2100. Specifically, on the receiver side, the date and time such as when the receiver was shipped is memorized, and if information with a clearly past date is transmitted, "1" is set in the 17th bit. It is calculated and processed as if it were.

TR-B15 Part 4 7.9 edition TR-B39 Part 5 1.7 edition

However, the B-CAS (registered trademark) card included in the receiver has different MJD processing (MJD processing) depending on when the card is issued. B-CAS cards whose payment began after a certain period correspond to dates after April 23, 2038. On the other hand, older B-CAS cards are not compatible with dates after April 23, 2038.

The problem to be solved by the present invention is to provide a receiver, a reception method, and a system that can be operated in a situation where a plurality of B-CAS cards with different MJD processing coexist.

One embodiment is a receiver for digital broadcasting, wherein the decoding information is obtained from a module having decoding information for descrambling a scrambled broadcast signal broadcast by the digital broadcasting, and the decoding information is control means for acquiring the broadcast signal by descrambling the scramble signal, and the control means sends a command to the module when the power of the receiver is turned on and the module is installed in the receiver. means for outputting and obtaining a response from the module that includes information for identifying a version of the module; and based on the version of the module, the module is an older version representing a modified Julian date (MJD) in 16 bits. and a message prompting the use of a new module that expresses the modified Julian date (MJD) in 17 bits or more if the version of the module is an old version that expresses the modified Julian date (MJD) in 17 bits or more; In addition, the display means displays a message to the effect that broadcast reception may become impossible if the old card is continued to be used, and the display of the message by the display means is deleted after a predetermined period of time, or the user To provide a receiver characterized in that erasing is performed according to an instruction from a receiver.

FIG. 1 is a diagram showing an example of the overall configuration of a system of a broadcasting station and a receiver according to an embodiment. FIG. 2 is a diagram schematically showing the configuration of a broadcasting station according to the embodiment. FIG. 3 is a diagram showing in detail the configuration of the receiver according to the embodiment. FIG. 4 is a diagram illustrating an example of the MJD period used by the system according to the embodiment. FIG. 5 is a flowchart showing an example of processing operation when the receiver according to the first embodiment displays an automatic message. FIG. 6 is a flowchart showing a process in which the receiver according to the embodiment interacts with an IC card (B-CAS card). FIG. 7 is a diagram showing an example of a response message area of an automatic display message applied by the receiver according to the embodiment. FIG. 8 is a diagram showing one card identification (version) in the B-CAS card according to the same embodiment. FIG. 9 is a flowchart showing an example of processing operation when the receiver according to the second embodiment displays an automatic message when selecting a channel. FIG. 10 is a diagram illustrating an example of an automatic display message display operation of the receiver according to the embodiment. FIG. 11 is a flowchart showing an example of interaction between the receiver and the IC card (B-CAS card) according to the same embodiment. FIG. 12 is a flowchart illustrating an example of processing operation when displaying an automatic message at the time of initial setting of the receiver according to the third embodiment. FIG. 13 is an example of a command and response format of the system according to the embodiment.

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

FIG. 1 is a diagram illustrating an example of the overall system configuration 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, and encodes (also referred to as encoding) and multiplexes the video signal and audio signal of the program to be broadcast. It has the function of transmitting a broadcast signal of any type of broadcast wave such as digital television broadcasting, BS digital broadcasting, wideband CS digital broadcasting, advanced BS digital broadcasting, advanced wideband CS digital broadcasting, etc.). Therefore, it is assumed that the transmitted signal also includes a route via the satellite. Additionally, the transmitted signal may include a cable route.

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

The broadcasting station server 101 stores metadata such as a program title, program ID, program summary, performers, broadcast date and time, and other data in advance in order to send it to a receiver (also called a receiving device) using a broadcast signal. This is a storage area.

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

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

The application management/distribution 121 manages contents and applications stored in the application server 122 and distributes them to the receiver 140.
The application server 122 is an area that stores content and applications provided to the receiver 140.

In addition, in response to a request from the receiver 140 that has received the first designation information, the service provider device 120 transfers the applications and contents stored in the application server 122 to a communication network such as the Internet using the application management/distribution 121. It is sent to the receiver 140 via .

The receiver 140 includes 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 (Application Programming Interface) 145, an application 146, and It includes a control unit 147, and receives broadcast signals broadcast from the broadcast station 100 to receive various broadcast programs and various service information, and acquires and operates applications from the service provider device 120 via the communication network. You can

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

The second basic function 141 also includes connection and data transmission/reception with peripheral devices connected to the receiver 140, such as a display 160, an HDD (Hard Disk Drive) 162 bound to the receiver 140, and a removable media 170. It also manages the

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

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

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

FIG. 2 is a diagram schematically showing the main configuration of a broadcasting station 200 (corresponding to 100 in FIG. 1).

The broadcasting station 200 generates a video encoder 201, an audio encoder 202, a subtitle encoder 203, and accompanying data including control data such as transmission control signals, service data, and application control information for controlling an application 145 running on the receiver 140. The attached data generation unit 204 is provided. Further, in the broadcasting station 200, a broadcasting station server 211 (corresponding to 101 in FIG. 1), a first security function 212 (corresponding to 102 in FIG. 1), and a transmitting/receiving unit 213 cooperate. The video encoder 201, the audio encoder 202, the subtitle encoder 203, the attached data generator 204, the multiplexer 205, the scrambler 206, the transmitter 207, and the transmitter/receiver 213 together form the first basic function 210 (corresponding to 103 in FIG. 1). ).
The codec type of the video encoder 201 is MPEG-2, H. 264 (MPEG-4AVC (AVC:Advanced Video Coding)), H.264 (MPEG-4AVC (AVC:Advanced Video Coding)) 265 (HEVC: High Efficiency Video Coding). Further, the codec type is not limited to this.

Further, as the multiplexing method, an MPEG-2 system method such as the MPEG-2 TS method or an MPEG Media Transport method (MMT method) may be used, or both may be used in combination. Further, the multiplexing method is not limited to this.

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

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

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

The second basic functions 315 include a broadcast tuner 301, a descrambler 302, a CAS module 303, an IC card reader/writer 303a, a demultiplexer 304, a data broadcast reception processing section 305, a video decoder 306, an audio decoder 307, a subtitle decoder 308, and an analysis 309 and a data broadcasting engine 310.

Note that the CAS module 303 is a separate device from the receiver, and the IC card reader/writer 303a serves as an interface to communicate with the CAS module 303 (B-CAS card).

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

The demultiplexer 304 separates the multiplexed stream into a video stream, an audio stream, a data broadcasting stream, a subtitle stream, and ancillary data, and sends the video stream to the video decoder 306, the audio stream to the audio decoder 307, and the data broadcasting 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 a video decoder 306, the audio stream is decoded by an audio decoder 307, and the subtitle stream is decoded by a subtitle decoder 308.

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

Further, the data broadcast stream separated by the demultiplexer 304 is sent to a data broadcast reception processing section 305, where reception processing is performed. The data broadcast reception processing unit 305 extracts a display signal to be displayed on the display 328 as a data broadcast from the data broadcast stream sent from the demultiplexer 304, and inputs the extracted display signal to the data broadcast engine 310. . The data 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 sent display signal.

The decoded video signal and subtitle signal are combined by a combiner 326 and output to a display 328 via a display control unit 327. The display control unit 327 performs settings such as gamma characteristics, display screen size, and display signal level.

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

Although FIG. 3 shows an example in which the display 328 and speaker 329 are built into the receiver 300, they may be external displays and speakers connected via an I/F such as HDMI. good. The display control unit 327 controls the content displayed on the display 328 even when the display 328 is an external display connected to the receiver 300 via an I/F such as HDMI.

The analysis unit 309 analyzes application control information, service data, and control data, and sends the analysis results to the control unit 330 as needed. The transmission control signal included in the control data includes channel identification information and program identification information of the program of the multiplexed video signal, and further includes application functions for the program of the multiplexed video signal. First designation information indicating that a service to be provided at the same time is added is included. The analysis unit 309 extracts the channel identification information, program identification information, and first designation information by analyzing the received control data, and transmits the extraction results to the control unit 330 at any time.

Furthermore, the receiver 300 has a control section 330 as a means for controlling the overall operation. The control unit 330 includes a second security function 322 (corresponding to 143 in FIG. 1), an application management function 323 (corresponding to 144 in FIG. 1), an API 324 (corresponding to 145 in FIG. 1), and an application 325 (corresponding to 146 in FIG. 1). (corresponding to). The control unit 330 may be a computer including a CPU and memory that can execute computer programs.

The second security function 322 reads out content protection information from transmission control signals included in broadcast waves and outputs it to other devices (not shown) on the home network via the network I/F 341. , performs content protection processing when outputting to connected peripheral devices (not shown, corresponding to 162 and 170 in FIG. 1). The API 324 is an I/F for the application management function 323 and the application 325 to operate in cooperation.

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

Note that the codec type of the video decoder 306 is based on the broadcast 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, and narrowband CS digital broadcasting. MPEG-2 (digital terrestrial television broadcasting, BS digital broadcasting, wideband BS digital broadcasting), H. 264 (AVC: Advance Video Coding) (narrowband CS digital broadcasting), H.264 (Advance Video Coding) (narrowband CS digital broadcasting). 265 (HEVC: High Efficiency Video Coding) (advanced BS digital broadcasting, advanced wideband CS digital broadcasting). Further, the codec type is not limited to this.

The communication control unit 340 has a network I/F 341 that is an I/F with a communication network 351, and a remote control I/F 342 that is an I/F with a remote controller (remote controller) 352.

The control unit 330 decrypts the ECM and EMM for the CAS module 303 in order to extract the scramble key (Ks) necessary for descrambling from the encrypted ECM and EMM sent from the analysis unit 309. issue instructions (commands) to The CAS module 303 decrypts the ECM and EMM and extracts the scramble key (Ks) based on instructions from the control unit 330. After extracting the scramble key (Ks), the CAS module 303 transmits the extracted scramble key (Ks) to the control unit 330. Upon receiving the scramble key (Ks) from the CAS module 303, the control unit 330 transmits the received scramble key (Ks) to the descrambler 302. Upon receiving the scramble key (Ks) from the control unit 330, the descrambler 302 sets the received scramble key (Ks) in an internal memory (not shown) or the like. When descrambling a scrambled broadcast signal, the descrambler 302 performs the descrambling using an internally stored scramble key (Ks). The CAS module 303 is, for example, a B-CAS card, and as described above, receives commands (instructions) output by the control unit 330, operates according to the commands, and outputs a response to the control unit 330. do.

The future date of MJD, which is expressed as encoded 16 bits transmitted in TOT (Time Offset Table) included in SI (Signaling Information) such as transmission control information, is expressed as 0xFFFF and is April 22, 2038. means. For this reason, for the period after April 23, 2038, ARIB TR-B15 Volume 4, "16.3 Regarding MJD after 2038" specifies a method of extending it until February 28, 2100. Further, in ARIB TR-B39, Volume 5, "5.24 Regarding the concept of MJD in CAS," the reference date for CAS is clearly defined as when "1" is considered to be present in the 17th bit of MJD in receiver processing.

FIG. 4 is a diagram showing an example of the MJD period used by the system according to the embodiment, and is a diagram shown in ARIB TR-B39 FIG. 5-5. The concept of MJD in CAS is explained below based on FIG.

The lower 16 bits (MJD value) of the encoded bits indicating MJD (Modified Julian Date) are all "1" on one day in the year 2038, and all "0" on the next day. , Part 4, 16.3 (about MJD after 2038) states, ``On the receiver side, remember the date and time such as when the receiver was shipped, and if information with a clearly past date is transmitted. is calculated and processed assuming that the 17th bit is set to "1".

On the other hand, in CAS, since the same MJD value is shared and used by the receiver 300 and the IC card (CAS module 303), it is necessary to unify the interpretations of both so that there is no discrepancy. Therefore, we decided to set a reference date for MJD as a CAS, and set that reference date as the most recent day (the minimum day when the 17th bit is calculated as "0"), and set the date one smaller than that reference date as the most recent day. Set it as the future day (the maximum day calculated assuming that the 17th bit is set to "1"). Specifically, this idea is applied to the following MJD used in CAS.
(1) Message code area/expiration date of EMM individual message section (2) Contract confirmation command/program broadcast date (3) Automatic display message display information acquisition command/current date (command)
・Expiration date (response)
(4) Energization control information request command/energization start reference date In this embodiment, the expiration dates of (1) and (3) above are used by the CAS module 303 (IC card, B-CAS card), This is a value that is not used by receiver 300. In FIG. 4, the reference date of MJD as CAS is 0x5840 (September 25, 1920). The furthest day in the future is 0x1583F (February 28, 2100, a value where the 17th bit is hypothetically "1").

Current date and current time information (JST_time) is transmitted by TOT. This time is defined by ARIB STD-B10 as "UTC (Universal Standard Time) + 9 hours" and will not change throughout the year even if the daylight saving time system is introduced. The receiver 300 can use the TOT to calibrate its internal clock, and uses this as a reference for time display, synchronized presentation, and the like. Date and time information is a total of 40 bits, consisting of the lower 16 bits of encoded MJD (year, month, day) and 24 bits of JTC (hour, minute, second) encoded with JST in six binary coded decimal numbers of 4 bit units. (See ARIB STD-B10 Part 2 Appendix C). The MJD after 2038 is shown below.

The lower 16 bits of MJD are all "1" on a certain day in the year 2038, and all "0" on the next day. If the conversion formula in Appendix C of ARIB STD-B10 Part 2 is used, all "0" goes back to the 1800s. Therefore, BS digital broadcasting operates as follows.
・The conversion formula specified in Appendix C of Part 2 of ARIB STD-B10 will continue to be used after 2038 until February 28, 2100, and the lower 16 bits of the converted MJD value will be sent.
・On the receiver 300 side, the date and time such as when the receiver was shipped is memorized, and if information on a date that is clearly in the past is transmitted, the 17th bit is assumed to be "1" and calculated. and process it.
・For the years after 2100, it is necessary to newly define the MJD conversion formula itself, which is currently unknown.

(First embodiment)
In this embodiment, the receiver 300 checks the IC card (CAS module 303) when the user turns on the sub power of the receiver 300, and when receiving a channel on which automatic display message service is performed, the receiver 300 checks the IC card (CAS module 303). An example will be shown in which a default automatic display message is displayed for a certain period of time if the IC card is not installed or is not a valid IC card. The automatic message display function is an essential function in CAS.

FIG. 5 is a flowchart showing an example of a processing operation when the receiver according to the first embodiment displays an automatic message, and may be implemented by a computer program.

A user transmits a power-on command to turn on the power of the receiver 140 from the remote control 352, for example. Receiver 140 receives the power ON command, turns on the sub power supply according to the power ON command, and receives the broadcast signal. The control unit 330 analyzes the received broadcast signal and confirms that the channel (designated by the CA_service_descriptor of CAT included in the transmission information signal) on which the automatic display message service is provided is being received (step S102). The confirmation in step S102 may include a case where a program received and stored by a receiver having a storage reception function (not shown) is played back. In step S102, if the receiving service is an automatic display message service, the control unit 330 checks the IC card (CAS module 303) (YES in step S102).

FIG. 6 is a flowchart showing a process in which the receiver according to the embodiment interacts with an IC card (B-CAS card), and may be implemented by a computer program.

The control unit 330 checks that the CA_system_id written in the CA service descriptor written in the received CAT matches the CA_system_id obtained from the IC card response, and that the service_id currently being selected is written (step S121). The control unit 330 analyzes the received broadcast signal, determines whether the EMM message included in the broadcast signal is an email or an automatic display message, and receives the automatic display message (step S121). More specifically, this is done by referring to the message control of the non-encrypted header of the message body in the EMM individual message section. If it is "IC card storage (0x01)", it is a message that corresponds to an automatic display message. The automatic display message is obtained from or includes an EMM individual message (IC card storage message) transmitted to each receiver 300 and an EMM common message commonly transmitted to all receivers. EMM individual messages are stored in the IC card, and EMM common messages are basically received when display is executed.

The EMM individual message of the automatic display message is always encrypted, decrypted by the CAS module 303 (IC card or B-CAS card), and stored in the IC card. In addition, there are B-CAS cards that are compatible only with 2K terrestrial digital broadcasting/satellite digital broadcasting, and ACAS chips that are compatible with 4K advanced wideband satellite digital broadcasting and 2K terrestrial digital broadcasting/satellite digital broadcasting, and these are collectively called CAS modules. It is called. The control unit 330 sends a message code area to the attached IC card using the EMM individual message reception command/response, and obtains a response message code (steps S123, S124). More specifically, the length of the message code area is shorter than the message division length obtained by the initial setting condition command, and the control unit 330 sends it to the IC card in one command without dividing it (step S123). The CAS module 303 (IC card) responds to the control unit 330 with the decoded automatic display message and the value of the message code area (step S124).

FIG. 7 is a diagram showing an example of the response message area of the automatic display message applied by the receiver according to the embodiment, and shows "item in message code area" and "description of left item" for each of D101 to D107. , indicates "the number of bits assigned to the left item".

The control unit 330 ignores (does not check) the tampering check (corresponding to D101 in FIG. 7) and the expiration date (corresponding to D102 in FIG. 7) included in the response message code area in the response received in step S124. Alternatively, those confirmation functions are stopped (steps S125, S126). This allows automatic display messages to be used without depending on expiration dates. Further, in the case of an automatic display message, stuffing (corresponding to D107 in FIG. 7) may exist in the final part of the response message code area. The control unit 330 does not check (ignore) the stuffing portion or stops the checking function. If there is an automatic display message in the response received in step S124, the control unit 330 displays it on the display 328 (YES in step S127, step S128). Note that the default automatic message may be stored in a memory (not shown) of the receiver 300, and the default automatic message stored in the memory may be displayed on the display 328 when a response is received from the IC card.

Through the above procedure, the control unit 330 can check for tampering (D101 in FIG. 7) and expiration date (D102 in FIG. 7) of the response message received from the CAS module 303 (IC card, B-CAS card). Automatic display messages may be displayed on display 328.

Returning to step S102 in FIG. 5, if the control unit 330 confirms that there is an automatic display message in the response received in step S127 in FIG. YES, step S103). The status of the IC card (valid/invalid/unusable) is defined as follows in TR-B15 Part 1, Part 5, Section 4.16.

The IC card reader/writer 303a of the receiver 300 has a function (electrical detection, etc.) to detect whether or not an IC card is attached, so the receiver 300 can detect the attachment status of the IC card based on the output from the IC card reader/writer 303a. Can be confirmed.
- A valid IC card means one that obtains the responses of ca_system_id and system_management_id described in Part 7 of this book in the "Initial Setting Condition Command" of Part 1 of ARIB STD-B25.
・Invalid IC card means one that does not meet the above-mentioned conditions for a valid IC card and the card type is "00" (prepaid card, not used for operational purposes).
-Even if the IC card is valid, if the return code is A1FF or A102, it is treated as an unusable card in this document to distinguish it from an invalid IC card.
- If the program being received is scrambled broadcasting, and the IC card is invalid or unusable, the error message described in 4.18 Error Notification Screen of the main story will be displayed.
- If the program being received is non-scrambled and the service_id being selected is written in the CA service descriptor written in CAT, and if the IC card is invalid, check 4.19 If a valid IC card is inserted. Perform the actions described in "What to do if there is no such thing." If the card cannot be used, the error message described in 4.18 ``Error Notification Screen'' of this volume will be displayed.
- Processing after power-on (for example, last channel display, menu display, etc.) is not specified.

If the IC card (CAS module 303) is not installed or invalid, the control unit 330 displays a default automatic display message on the display 328 for a certain period of time (YES in step S103, S104). The message display in step S104 is performed by counting the display time using an internal clock or the like, and after displaying the message for a predetermined time specified in advance by SI (EMM), the message is erased or the display is stopped (YES in step S105, S106). . Further, in step S105, the user may press a confirmation button from the remote control 352 or the like, and after the control unit 330 receives a command to delete the message, the process in step S106 may be deleted or stopped. After erasing the displayed message in step S106, the user views the program (step S107). With this procedure, it is possible to prevent the display of the default message from interfering with the user's viewing. Note that the timing for displaying and erasing the default automatic message (steps S104 and S107) is specified in the EMM included in the broadcast signal. The default automatic message is that if the IC card (CAS module 303) is not installed or disabled, the message ``No valid IC card is installed'' will be displayed, and in the case of a contract renewal notification, for example, `` The contract will end in xx days. If the cancellation procedure is not completed, the contract will be automatically renewed."

On the other hand, in step S103, if the IC card (CAS module 303) is not installed and is a valid IC card (if the IC card is not installed or invalid), the "card identification version" is determined by the card identification. (NO in step S103, S108). In this embodiment, a "card identification version" is defined, and a B-CAS card to be displayed, such as a new version of the card, is identified using the "card identification version." The "card identification version" is identified, and based on the identification result, only the old card is targeted for message (MSG) display. Furthermore, in the case of NO in step S102, the process similarly moves to step S108.

FIG. 8 is a diagram showing an example of card identification (version) in the B-CAS card according to the same embodiment.

001,002,003 is used as the card identification (version) for the B-CAS card. 001 is a first generation card and indicates that the bit number in MJD notation is 16 bits, 002 is a second generation card and indicates that the bit number in MJD notation is 16 bits, and 003 is a third generation card. It is a generation card, and the number of bits in MJD notation indicates that it is 17 bits.

Returning to step S108 in FIG. 5, if the "card identification version" is "001" or "002", the message "Please insert and use the new IC card included in the receiver. If you continue, you may not be able to receive the broadcast.'' message (MSG) is displayed on the display 328 (YES in step S108, S109). After displaying the MSG in step S109, the control unit 330 counts the display time. After the MSG is displayed in step 109, if the user presses a confirmation button to delete the message from the remote control 352 or the like, and the control unit 330 receives a command to delete the message, it deletes the displayed MSG or Stop displaying the MSG (YES in step S110, S112). On the other hand, if the control unit 330 does not receive the command to delete the message (NO in step S110), the control unit 330 checks the counted display time and determines that the display time has elapsed for a predetermined period of time (5 to 10 seconds) or more. If so, the message is deleted or the display is stopped (YES in step S111, S112). After the displayed message is deleted in step S112, the user views the program (step S107). On the other hand, if the MSG display time has not elapsed for more than a predetermined time (5 to 10 seconds) in step S111, the message continues to be displayed (NO in step S111). With this procedure, it is possible to prevent the display of the message from interfering with the user's viewing.

On the other hand, if the "card identification version" is other than "001" or "002", no message is displayed (NO in step S108). Note that the ``card identification manufacturer identification'' is not used for judgment no matter what value it is.

According to the above procedure, when the user turns on the sub power of the receiver 300, the IC card (CAS module 303) is checked, and if the IC card is not installed or is not a valid IC card, the default is set for a certain period of time. automatic display messages can be displayed. Furthermore, when an IC card is inserted and is a valid IC card, an MSG can be displayed according to the card identification bar location. In principle, the display operation of the default automatic message is specified by the EMM included in the broadcast signal (that is, the broadcaster), but the MSG in this embodiment is The display operation is determined based on the card identification version and other factors.

Note that the number of times the message is displayed in steps S104 and S109 may be suppressed so that the message is not displayed frequently and obstructs the user's viewing. For example, it may be displayed once a day, only at the first startup.

(Second embodiment)
In this embodiment, an example will be shown in which a message is displayed when the user selects a channel.

FIG. 9 is a flowchart showing an example of a processing operation when the receiver according to the embodiment displays an automatic message at the time of channel selection, and may be implemented by a computer program.

When selecting a program, the control unit 330 of the receiver 300 acquires the EMM individual message information stored in the IC card by exchanging an automatic display message display information acquisition command/response with the IC card (steps S201 and S202). . The receiver 300 ignores the expiration date (corresponding to D102 in FIG. 7) included in the automatic display message display information acquisition response (step S203). Note that the receiver 300 may have a function of checking the expiration date included in the response, or may actively stop this function.

The receiver 300 must generate one automatic display message information acquisition command from one CA service descriptor. The receiver 300 acquires the message template number from the EMM individual message information obtained from the IC card, and receives the corresponding EMM common message (step S204). Difference information in the EMM individual information message information is added to the received EMM common message information and displayed on the screen (step S205). Note that there may be cases where there is no difference information.

FIG. 10 is a diagram showing an example of the display operation of the automatic display message of the receiver according to the same embodiment. According to the automatic display duration times 1, 2, and 3, display on/off control is performed as shown in FIG. 10, for example. The control unit 330 counts the number of times of automatic display, and repeats the above-mentioned display on/off control for the number of times of automatic display written in the EMM common message body (NO in step 206). After repeating the automatic message display a predetermined number of times, the control unit 330 erases the display (YES in step 206, S207). When a new program is selected again, the receiver 300 executes the above control anew from step S201.

The receiver operations (corresponding to the operations in steps S206 and S207) for the three automatic display and deletion types described in the EMM common message section are as follows.
(1) 0x00: Erasable Messages can be erased by viewer operations during the display period, including on/off of the above-mentioned message. (2) 0x01: Messages cannot be erased by viewer operations during message display periods. Don't go.
(3) 0x02: Display deletion automatic display message is not displayed. If the automatic display message is displayed and the message is updated to "display erased", the display of the automatic display message including the message frame is canceled.

The automatic display message and automatic display deletion type will be explained in detail below.
- By transmitting the grace period sent in the CA service descriptor to the IC card, the period until the automatic display message starts to be displayed is controlled. In this case, since the schedule is managed within the IC card, the receiver does not need to manage the schedule regarding this grace period, and can just follow the automatic display message information acquisition command/response with the IC card.
- Regarding automatic display messages, the retransmission check for the same EMM individual message is performed using the message ID and entity identification written in the EMM individual message section. It is desirable that the receiver be equipped with a mechanism to prevent re-reception of the same message, such as storing the message ID and entity identification of the message received immediately before.
- The EMM common message version monitoring period is the display period of the EMM common message in use (the period calculated by multiplying the sum of automatic display periods 1 to 3 by the number of automatic displays). However, if the automatic display message type is 0x02 (display erased), version monitoring is always performed.
- If the message code itself is updated, it will be reflected and displayed immediately. In addition, the display period at the time of update can be counted either from the time of update (reload) or from the next display period (by channel switching, etc.), but as much as possible. The latter is preferable.
- Items that are changed when the version number of the EMM common message is updated are the message code body (including recommended display position information), automatic display deletion type, automatic display duration 1 to 3, and number of automatic displays.

FIG. 11 is a flowchart showing an example of the exchange between the receiver and the IC card (B-CAS card) according to the same embodiment, and may be implemented by a computer program.

For example, when the user selects a program to be received by the receiver 300 (step S221), the control unit 330 sends the CAS module 303 (B-CAS card) information about the current date and time, MSG (message) being operated, etc. A command including the following is transmitted (step S222). Upon receiving the command, the CAS module 303 makes a determination regarding the MSG (message) and transmits a response (steps S223, S224). More specifically, the CAS module 303 determines the presence or absence of MSG and determines the expiration date of MSG based on the received command (step S223). The CAS module 303 includes the determined presence or absence of the MSG and the expiration date of the MSG together with the MSG sentence number in a response, and transmits the response to the control unit 330 (step S224). The control unit 330 receives and processes the response (step S225). The control unit 330 ignores the expiration date of the MSG in the received response and checks the presence or absence of the MSG, and if it is confirmed that the MSG exists, displays the received MSG on the display 328. On the other hand, the control unit 330 ignores the expiration date of the MSG in the received response and checks the presence or absence of the MSG. If it is confirmed that there is no MSG, the control unit 330 hides the MSG on the display 328.

According to the above procedure, when the user selects a channel on the receiver 300 and a 16-bit MJD processing IC card is used as the CAS module 303, a message (MSG) is displayed on the display unit 328 of the receiver 300. can do.

Therefore, in this embodiment, the MSG expiration date is determined within the card by changing the process (step S226) to ignore the expiration date of the automatic display message responded from the card in the control unit 330 of the receiver 300. There are both types of IC cards, 16 bits MJD processing and 17 bits MJD processing, and it is possible to continue the automatic display message operation even on dates exceeding MJD = 0xFFFF.

(Third embodiment)
In this embodiment, an example will be shown in which a message is displayed in the initial setting functions of the receiver, such as regional setting, channel scan, and network setting, which are performed when the receiver starts to be used for the first time.

FIG. 12 is a flowchart showing an example of a processing operation when displaying an automatic message at the time of initial setting of a receiver according to the third embodiment, and may be implemented by a computer program.

When initializing the receiver 300, the control unit 330 checks the card identification version (steps S301 and S302). If the "card identification version" obtained by the card ID information acquisition command/response is "001" or "002", the message "Please install the new IC card included in the receiver and use it. The old card If you continue to use , you may not be able to receive broadcasts.'' is displayed (YES in step S303, S304). Note that if the initial setting function does not have a card ID information display function, it is desirable to display a message in the card ID information display function such as a menu. Furthermore, the ``card identification manufacturer identification'' is not used for judgment no matter what value it is.

FIG. 13 shows an example of the command and response format of the system according to the same embodiment, in which (a) shows the initial setting condition command in Part 1 of ARIB STD-B25, and (b) shows the initial setting condition response. The "offset", "field", "length (Byte)" and "value (HEX)" of "data" are shown for each of D301 to D305 and D351 to D363.

The command/response format between the IC card (CAS module 303) and the digital DIRD (which may also be the control unit 330) is defined below.
- Regarding the "data" field of the initial setting condition response, only the protocol unit with IC card protocol unit number = 0 is shown.
- Obtain the shared conditions between the DIRD and the IC card, such as the ECM data of the initial setting condition command, information for filtering EMM data, and the type of IC card.
- The card ID obtained by the initial setting condition command is an individual card ID. If the group ID is recorded on the IC card, the response IC card instruction instructs to "obtain card ID information", so the card ID information obtaining command is subsequently issued to obtain the group ID.

Further, the control unit 330 may display the IC card information acquired from the IC card (CAS module 303) on the display 328. More specifically, it may be equipped with the functions of ARIB STD-B25 "Chapter 4 Technical Specifications Related to Receiver 4.2 User Interface, 4.2.10 Card Information Display". The specific functions, inputs, display items, etc. are shown below.
・Display the IC card information obtained from the IC card.
・Display indicating that it is a display of card information ・Display of manufacturer identification (ASCII 1 character) and version (3 digits in decimal) as card identification ・Display indicating that it is card identification ・Display of card identification with ID identification ~ individual Card ID to check code are combined into 20 decimal digits and displayed with a break every 4 digits. The details are displayed as ID identification (1 digit), individual card ID (14 decimal digits), and check code (5 digits), with a break every 4 digits.
・Display indicating that it is a card ID ・If there is a group ID, the information from ID identification to group ID to check code is displayed together as a 20-digit decimal number, with a break every 4 digits.
・Display indicating that it is a group ID ・Display of the group ID number (group ID number including ID identification number) corresponding to the selected ID identification ・If the group ID number corresponding to the selected ID identification is not set A message indicating that it has not been set will be displayed. With the above procedure, if a first or second generation 16-bit MJD processing IC card is used as the CAS module 303 in the initial setting function of the receiver 300, , a message (MSG) can be displayed on the display unit 328 of the receiver 300.

According to at least one embodiment described above, in a situation where B-CAS cards with 16 bits MJD processing and 17 bits MJD processing are mixed, the receiver's CAS processing is performed so that it can be operated without problems even after April 23, 2038. It is possible to provide a receiver, a reception method, and a system for performing the above.

Note that, as described above, this embodiment includes the following characteristic configurations.
(A-1) Determine and display the card identification version when starting the receiver. (When starting the receiver, if the "card identification version" is obtained from the card ID information acquisition command/response and is "001" or "002", the message "Insert the new IC card included in the receiver. If you continue to use an old card, you may not be able to receive broadcasts.'' is displayed for a specified period of time (5 to 10 seconds).
(A-2) The above message display is cleared after being displayed for a predetermined time (5 to 10 seconds) or after the user operates the confirmation button, so that viewing is not interrupted.
(A-3) Reduce the number of times the above message is displayed so that it does not interfere with viewing due to frequent display (e.g. display once a day, only at first startup, etc.)
(A-4) The card identification version is also determined and displayed during initial setup of the receiver. (When starting the receiver, if the "card identification version" is obtained from the card ID information acquisition command/response and is "001" or "002", the message "Insert the new IC card included in the receiver. If you continue to use an old card, you may not be able to receive broadcasts.'' is displayed.

Note that the names, definitions, types, etc. of condition parameters, options for them, values, evaluation indicators, etc. displayed on the analysis screen etc. shown in the drawings are shown as examples in this embodiment, and are not included in this embodiment. It is not limited to what is shown.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention, and Technical elements may be applied to other embodiments. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents. Furthermore, each component of the claims is within the scope of the present invention even when the component is expressed separately, or when a plurality of components are expressed together, or when these are expressed in combination. Furthermore, a plurality of embodiments may be combined, and embodiments constituted by this combination are also within the scope of the invention.

Further, in order to make the explanation clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual aspect. In a block diagram, data and signals may be exchanged between blocks that are not connected, or even in directions where arrows are not shown even if the blocks are connected. The processes shown in flowcharts, sequence charts, etc. are based on hardware such as IC chips and digital signal processors (DSPs), software (programs, etc.) operated on computers including microcomputers, or combinations of hardware and software. It may be realized by a combination. Furthermore, the device of the present invention is applied even when the claims are expressed as control logic, as a program containing instructions for a computer to execute, or as a computer-readable recording medium containing the instructions. be. Furthermore, the names and terms used are not limited, and other expressions are included in the present invention as long as they have substantially the same content and purpose.

100... Broadcasting station, 101... Broadcasting station server, 102... First security function, 103... First basic function, 120... Service provider device, 140... Receiver , 141... Second basic function, 142... Communication control unit, 143... Second security function, 144... Application management function, 145... API, 146... Application, 160 . . . Display device, 162 . . . HDD, 201 . . . Video encoder, 302 . ...Video decoder, 309...Analysis unit, 330...Control unit, 327...Display control unit, 328...Display device, 329...Speaker.

Claims (2)

A digital broadcast receiver,
Obtaining the decoding information from a module that has decoding information for descrambling the scrambled broadcast signal broadcast by the digital broadcasting, and using the decoding information to descramble the scrambled signal to obtain the broadcast signal. comprising control means;
The control means outputs a command to the module when the receiver is powered on and the module is attached to the receiver, and receives a response from the module that includes information for identifying the version of the module. and a means to obtain
means for determining whether the module is an old version that expresses a Modified Julian Date (MJD) in 16 bits based on a version of the module;
If the version of the module is an old version that expresses the modified Julian date (MJD) in 16 bits, a message will be displayed urging you to use a new module that expresses the modified Julian date (MJD) in 17 bits or more, and you will continue to use the old card. and display means for displaying a message to the effect that broadcast reception may become impossible,
A receiver characterized in that the display of the message by the display means is erased after being displayed for a predetermined time, or is erased according to an instruction from a user. The receiver according to claim 1, wherein the control means outputs an initial setting condition command to the module and obtains the response from the module at the time of initial setting of the receiver.

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