JP7171676B2 - receiver - Google Patents

Description

An embodiment of the present invention relates to a receiver for broadcast waves.

As a technical standard for digital television broadcasting, there is a standard issued by the Association of Radio Industries and Businesses (ARIB). This standard defines compliance rules for copy control with respect to protection of programs (contents) when users use (view, record, and reproduce) the programs (also called content). This rule is defined mainly for three types of interfaces. These three types of interfaces are 1) output terminals, 2) removable media, and 3) storage media.

The output terminal 1) is an interface for a receiver that has received a program to output the received program with compatibility with other devices. Copy control in this interface includes, specifically, the HDCP (High-bandwidth Digital Content Protection System) method at the HDMI (registered trademark) terminal and the DTCP (Digital Transmission Content Protection) method is specified by the ARIB standard.

The removable media of 2) are recording media such as BDs and SD cards, which are not tied to receivers and which allow the programs to be played back by equipment other than the receiver that received the programs. As copy control in this interface, specifically, the AACS (Advanced Access Content System) method for BD is specified by the ARIB standard.

The storage medium of 3) is a recording medium bound to a receiver, such as a built-in HDD, a USB-connected HDD, or the like, which enables only the receiver that receives the program to reproduce the program.

WO2061/031911

"Digital Terrestrial Television Broadcasting Operation Regulations Technical Data" ARIB TR-B14 Version 6.2 Revised on July 6, 2016, Association of Radio Industries and Businesses "Video coding, audio coding and multiplexing methods in digital broadcasting" "Standard" ARIB TR-B32 Ver.3.8 Part 1 Appendix 5 Revised on July 6, 2016, Association of Radio Industries and Businesses "Program Sequence Information Standard for Digital Broadcasting" ARIB STD-B10 Version 5.9 Revised on September 29, 2016, Association of Radio Industries and Businesses "Media transport method standard by MMT in digital method" ARIB STD-B60 Version 1.8 Revised on September 29, 2016, Association of Radio Industries and Businesses "BS/Broadband CS Digital Broadcasting Operation Regulations Technical Data" ARIB TR-B15 Version 7.1 Revised on July 6, 2016, Association of Radio Industries and Businesses "Advanced Broadband Satellite Digital Broadcasting Operational Regulations Technical Data" ARIB TR-B39 Version 1.1 Revised on September 29, 2016, Association of Radio Industries and Businesses

In content copy control based on the above-mentioned standards, there is a demand for a more diverse method because the range of expression such as image color and contrast is expanding.

The receiving device of the present embodiment includes first designation information for designating whether or not to use a copy protection method that is more advanced than the current copy protection method when outputting a received broadcast program from the receiving device , and video sophistication. 4K broadcasting that adopts an encoded video format that is configured to place the second designation information that designates whether or not the receiving side performs conversion according to the difference from the current broadcasting accompanying 8K broadcasting on the broadcast wave of 8K broadcasting A receiving device for receiving broadcast waves, wherein the broadcast waves of the 8K broadcast are MMT broadcast waves, and the sophistication of the video includes resolution, pixel bit (gradation), frame frequency (frame rate), indicates that one or more parameters of colorimetry (color gamut) and dynamic range are higher than the current broadcast video, and the first designation information and/or the second designation information is PMT for each broadcast program (program map table), wherein the second designation information indicates whether or not the broadcast wave receiving side can convert any of the one or more parameters. When processing a video included in the received broadcast wave, the first and processing means for processing based on the designation information of and the second designation information, the advanced copy protection method is advanced copy protection control, the resolution conversion of the video is resolution control, and the video dynamic A receiver in which at least one of the requirements listed below is specified based on the descriptor and executed in the process on the receiver side when range conversion is DR controlled:
Requirement 1: Said advanced copy protection control is necessary, said resolution control is impossible;
Requirement 2: Said advanced copy protection control is unnecessary, said resolution control is impossible;
Requirement 3: The advanced copy protection control is necessary, and the resolution control is possible;
Requirement 4: The advanced copy protection control is unnecessary, and the resolution control is possible.

FIG. 1 is a diagram schematically showing a receiver to which this embodiment is applied and its peripheral devices. FIG. 2 is a diagram showing an example in which the configuration of FIG. 1 is further specified. FIG. 3 is a diagram schematically showing an example of an environment in which copy control compliance rules are applied. FIG. 4A is a diagram showing the data structure of a digital copy control descriptor. FIG. 4B is a diagram showing bit assignments of digital_recording_control_data (digital copy control information), which is one of the components of the digital copy control descriptor shown in FIG. 4A. FIG. 5A is a diagram showing the data structure of the Content Availability Descriptor. FIG. 5B is a diagram showing bit assignment of retention_mode (temporary storage control), which is one of the components of the content availability descriptor shown in FIG. 5A. FIG. 6 shows the types of table of service information including digital copy control descriptors and content use descriptors when the digital copy control descriptors and content use descriptors shown in FIGS. 4A and 5A are transmitted by broadcast waves. It is a figure which shows. FIG. 7 is a diagram conceptually showing the direction of evolution of video formats. FIG. 8 shows an example of a conversion pattern in which the receiver converts the video sent from the broadcasting station according to the attributes of the peripheral device connected to the receiver. FIG. 9A is an example of bit assignment of control bits (b2) for realizing requirements (compliance rules) required for receiver implementation when broadcast waves contain copy control information regarding color gamut and luminance. FIG. 9B is an example of bit assignment of control bits (b1) for realizing requirements (compliance rules) required for receiver implementation when broadcast waves contain copy control information related to resolution. FIG. 9C is an example of bit assignment of control bits (b0) for realizing requirements (compliance rules) required for receiver implementation when broadcast waves contain copy control information regarding color gamut and luminance. FIG. 9D realizes the requirements (compliance rules) required for receiver implementation when the broadcast wave contains copy control information related to the case where the image quality of general HD broadcasting is exceeded in some way (resolution, brightness, color gamut, etc.). FIG. 10 is a diagram showing an example of bit assignments of control bits (b1-b0) for . FIG. 10 is a diagram showing another example of requirements (compliance rules) required for implementation of a receiver realized by the bit assignments shown in FIGS. 9A, 9B and 9C. FIG. 11 is a diagram showing an example of a content usage descriptor that is used to implement compliance rules on the receiver side when copy control is performed on a video signal that has diversity in color gamut and brightness. . FIG. 12 is a diagram showing an example of a newly defined descriptor that is used to implement compliance rules on the receiver side when copy control is performed on a video signal that has diversity in color gamut and luminance. is. FIG. 13A is a diagram showing another example of requirements (compliance rules) required for implementation of a receiver that implements other bit assignments of copy control information relating to color gamut and luminance to broadcast waves. FIG. 13B is a diagram showing another example of requirements (compliance rules) required for implementation of a receiver that uses part of the copy control information bit assignment shown in FIG. 13A. FIG. 14 is a flowchart illustrating processing on the sender side according to one embodiment. FIG. 15 is a flowchart illustrating processing on the receiving side according to one embodiment.

Embodiments will be described below with reference to the drawings.

First, an overview of the idea of the present embodiment will be described. In 2K broadcasting, it is possible to broadcast as a video signal that is more advanced than the current broadcasting, according to the above-mentioned document, it is possible to operate the video signal with the following capabilities (note that the current system capability information is described in parentheses) .

Brightness: HDR (High Dynamic Range) (SDR (Standard Dynamic Range))
Color Gamut: BT.2020 (BT.709)
Gradation: Pixel bit 10 bits (8 bits)
Frame frequency: 60Hz, progressive (30Hz, interlace)
In 4K and 8K, in addition to the above,
Resolution: 4K and 8K (2K)
Frame frequency: 120Hz (30Hz)
Current general HD (High Definition) broadcasting has a resolution of 2K, pixel bit (gradation): 8bit, colorimetry (color gamut): BT.709, SDR, frame frequency is 30/1.001Hz, 30Hz. Yes, but higher resolutions: 4K and 8K, pixel bits: 10 bits, colorimetry: BT.2020 (xvYCC is also acceptable for 2K SDR broadcasting for information purposes), HDR, frame rate: 60/1.001 Hz, 60 Hz , 120/1.001 Hz, and 120 Hz.

Reception with parameters such as "resolution", "pixel bit (gradation)", "colorimetry (color gamut)", "dynamic range (HDR/SDR", and "frame frequency" that exceed current general HD broadcasting Depending on the purpose of use of the program, it is necessary to consider whether the parameter conversion is allowed or not. It is also necessary to consider providing a control bit indicating whether or not to require a more advanced copy control method than the current 2K broadcasting when outputting to a device that is present or recording on removable media.

Based on these considerations, in the embodiment, control information related to parameter conversion and copy control is arranged in the PMT specified in Non-Patent Document 3 and the MPT specified in Non-Patent Document 4, for example. , for example, enables control as described later.

FIG. 1 is a diagram schematically showing a receiver to which this embodiment is applied and its peripheral devices. The broadcast wave 160 includes video signals and audio signals compressed and multiplexed in MPEG2 format, as well as transmission control signals described in Non-Patent Document 2 and the like. When the receiver 110 receives the broadcast wave 160 sent from the broadcasting station 101 or the broadcasting satellite or the communication satellite 102, it decodes the video signal and the audio signal in it, and analyzes the transmission control signal to perform the broadcast. You can receive programs and various service information.

Further, the receiver 110 operates on the basis of the information on program protection (copy control) contained in the transmission control signal and the attribute information of the peripheral device connected to the receiver 110. Copy control processing is executed in media and storage media.

As a peripheral device connected to the receiver 110, for example, a specific example of the removable media 140 is a BD (Blu-ray (registered trademark) Disc). Devices connected to the output terminal include, for example, the display device 120 (4K resolution, non-HDR compatible) or 121 (2K resolution, non-HDR compatible), and the smart phone 150 . Further, as a storage medium, for example, there is an HDD (Hard Disk Drive) 130 or 131 bound to the display device 120 or 121 . The receiver 110 and the smartphone 150 are connected via a Wi-Fi home network 161, for example. The receiver 110 can be connected to peripheral devices having various attribute information. copy control in the three types of interfaces described in .

FIG. 2 is a diagram showing the configuration of FIG. 1 more concretely.

A broadcasting station 200 includes a broadcasting station server 201 and a security function 202 .

Broadcasting station 200 transmits video signals and audio signals compressed and multiplexed in MPEG2 format, and transmission control signals described in Non-Patent Document 2 and Non-Patent Document 3 associated therewith, as broadcast signals by radio waves. The transmission control signal includes program specific information (PSI) and program sequence information (SI). Specific program information is information necessary to specify a desired program from multiplexed video signal and audio signal streams. The program arrangement information is various types of information defined for convenience when the receiver selects programs. The broadcast signal may be any one of a terrestrial broadcast signal, a BS broadcast signal, and a CS broadcast signal.

A broadcasting station 200 operates a broadcasting station server 201 . The broadcasting station server 201 stores program titles, program IDs, program summaries, performers, broadcast dates and other information associated with programs to be broadcast, and provides them to the receiver 210 .

The security function 202 performs settings related to protection (copy control) of programs included in broadcast waves sent out by a broadcasting station. Specific contents of the copy control will be described with reference to FIGS. 4A to 13. FIG.

Receiver 210 includes basic function 214 and security function 213 . It also has an application 211 that operates on the basic function 214 and an API 212 that is an interface between the application 211 and the basic function 214 . Note that the application 211 and the API 212 may be provided in the receiver 210 in advance, or may be installed in the receiver 210 at any timing by the user of the receiver 210 . Alternatively, the receiver 210 itself may automatically install based on information obtained via broadcast waves or information obtained via a network (not shown).

The basic function 214 is a basic function of the receiver, which receives broadcast waves sent from the broadcasting station 200, separates video signals, audio signals, and accompanying transmission control signals contained in the broadcast waves, It decodes signals and audio signals and analyzes transmission control signals. In addition, the basic function 214 includes peripheral devices connected to the receiver 210, such as a display device 220, an HDD (HradDiskDrive) 230 bound to the display device 220, a removable media 240, and a smartphone 250. to manage

The security function 213 reads the transmission control signal analyzed by the basic function 214 and analyzes the information contained therein regarding protection (copy control) of the program set by the broadcasting station 200 . The security function 213 is based on the analysis result of the copy control information and the attribute information of the peripheral device connected to the receiver 210. The security function 213 uses the above-described three types of interfaces, namely, the output terminal, the removable media, and the storage media. Perform copy control processing.

Regarding copy control processing, a case where a receiver 210 outputs a video signal sent from a broadcasting station 200 to a display device (2K resolution, non-HDR luminance, BT.709 color gamut) 220 is taken as an example. explain.

The video signal sent from the broadcast wave has a resolution of 4K, a brightness of HDR, and a color gamut of BT. 2020. In this case, the receiver 210 needs to convert the received video signal according to the attributes of the display device 220 . Therefore, the basic function 214 receives information on program protection (copy control) analyzed by the security function 213, and changes the resolution from 4K to 2K, the brightness from HDR to SDR, and the color gamut from BT. 2020->BT.709 conversion is determined, and if output is possible, the converted video signal is output to the display device 220 .

Similarly, a case where the receiver 210 records the video sent from the broadcasting station 200 on a BD as the removable media 240 will be taken as an example. In this case, the basic function 214 needs to convert the received video signal of the program sent from the broadcasting station for recording on the BD in accordance with the attributes of the BD. Therefore, the basic function 214 receives information on program protection (copy control) analyzed by the security function 213, and changes the resolution from 4K to 2K, the brightness from HDR to SDR, and the color gamut from BT. 2020->BT.709 conversion is determined, and if recording is possible, the converted video signal is recorded on a BD.

Application 211 and API 212 have functions that make the functionality of receiver 210 user-friendly. These functions can be updated from time to time, thereby improving usability of the receiver 210 for the user.

The receiver 210 can be connected to a display device 220 for displaying received programs, and a BD (registered trademark) or SD (registered trademark) recording medium 240 for recording received programs. Furthermore, the receiver 210 is connected to a mobile terminal 250 such as a smartphone via a home network such as Wi-Fi (registered trademark), and the received program can be displayed or recorded on the smartphone 250. .

The display device 220 shown in FIG. 2 may be either the display device 120 having a resolution of 4K or the display device 121 having a resolution of 2K as shown in FIG. As for the color gamut, as shown in FIG. 1, for example, BT. 2020, the BT. The display device 121 having 709 may also be used. As for brightness, the display devices 120 and 121 that do not support HDR, for example, may be used as shown in FIG.

As for the resolution, the smartphone 250 shown in FIG. 2 may be the smartphone 150 which also has a resolution of, for example, 4K as shown in FIG. As for the color gamut, as shown in FIG. 1, for example, BT. The smart phone 150 having 2020 may also be used. As for luminance, for example, a smartphone 150 not compatible with HDR may be used as shown in FIG.

In this embodiment, regarding the implementation of conventionally defined compliance rules, by adding information on color gamut and luminance as decision elements, , it is possible to perform more detailed copy control including color gamut and brightness.

FIG. 3 is a diagram schematically showing an example of an environment in which the compliance rules of copy control in the three interfaces shown above are applied. The receiver 210, which receives the broadcast signal sent from the broadcasting station 200, outputs the received broadcast signal to the connected peripheral device as defined by ARIB (Non-Patent Documents 1, 5, 6). must be output in accordance with the applicable content protection regulations.

Content protection regulations are defined for the three interfaces of the output terminal, removable media, and storage media, as described above.

Protection of content recorded on removable media and storage media is based on the copy control information stipulated in the digital copy control descriptor and content use descriptor included in the transmission control signal sent from the broadcasting station. This is a mechanism that limits the number of copies and temporary storage time.

Protection of content via the output terminal eliminates illegal acquisition of programs by a third party by performing connection authentication and encrypted communication between the output terminal of the receiver and the output destination device. It's how it works. Mechanisms for eliminating illegal acquisition of programs through the intervention of a third party include, for example, HDCP and DTCP.

FIGS. 4A and 4B show the data structure of the digital copy control descriptor defined in Non-Patent Document 2 and the bit assignments of the digital copy control information, which is a component therein. The digital copy control descriptor indicates information that controls the copy generation in digital recording equipment. When it is assumed that digital recording will be performed, the broadcasting station, which is the producer of the program, will provide information on recording and copying of the program. Used to transmit to the receiver.

The Digital Copy Control Descriptor contains bit assignments having the meaning shown in "Data Structure". Taking digital_recording_control_data (digital copy control information) as an example, the first 2 bits of the third byte from the beginning of the digital copy control descriptor are assigned, and these 2 bits have the meaning of "description" shown in FIG. 4B. It is assigned. For example, "provider definition" with bit assignment=01 indicates that the proprietor independently defines the contents of copy control. Bit assignment=10 and "1st generation copy only" indicates that the received program can be recorded (first generation copy), but the recorded program cannot be duplicated.

FIGS. 5A and 5B also show the data structure of the content use descriptor defined in Non-Patent Document 2 and the bit assignment of the permissible temporary storage time, which is a component therein. A content use descriptor indicates information for controlling recording and output, and is used in combination with a digital copy control descriptor when a broadcasting station, which is a program producer, controls recording and output of a program.

Content use descriptors also have bit assignments that have the meaning shown in the "data structure". Taking retention_state (temporary storage permissible time) as an example, the bits from the 5th bit to the 7th bit from the beginning of the 3rd byte from the beginning of the content availability descriptor are assigned, and the 3 bits are shown in FIG. 5B It is a bit assignment with the meaning of "description". Also, taking image_constraint_token (resolution limit bit) as an example, the 3rd bit from the 3rd byte from the beginning of the Content Use Descriptor is assigned, and if that field is "0", the video signal to be output is It means that you need to limit the resolution.

These digital copy control descriptors and content use descriptors are included in the table of the service information and sent from the broadcasting station.

FIG. 6 shows types of tables of program specific information or service information including copy control descriptors and content availability descriptors. A PMT (Program Map Table) is a table that designates packet identification of TS packets that transmit each encoded signal that constitutes a broadcast program. The SDT (Service Description Table) is a table that transmits information about organized channels such as the names of organized channels and the names of broadcasters. EIT (Event Information Table) is a table for designating information related to a program such as program name, broadcast date and time, description of contents, and the like.

FIG. 7 is a diagram conceptually showing the direction of evolution of video formats from five viewpoints. There are three viewpoints of resolution evolution: two-dimensional resolution (planar resolution), three-dimensional resolution (gradation), and four-dimensional resolution (frame rate). On the other hand, as a direction of evolution of the expression range, there are a color expression range and a luminance expression range. Therefore, as mentioned in the description of FIGS. 1 and 2, this embodiment adds information about the color expression range (color gamut) and the luminance expression range to the copy control compliance rules, thereby enabling the connection to the receiver. This makes it possible to perform finer copy control including the color gamut and brightness based on the attributes of the peripheral equipment and the attributes of the received program.

FIG. 8 shows that when the receiver 110 outputs or records a video signal sent from a broadcasting station to a connected peripheral device as shown in FIGS. Examples of conversion patterns for converting video according to various attributes are shown. "Original video" represents the attribute of the video signal sent from the broadcasting station. "Video after conversion by the receiver" represents the attribute of the video signal after the receiver converts the video signal sent from the broadcasting station according to the attributes of the peripheral device connected to the receiver. there is For example, combination No. 1 is an example in which the receiver is connected to an existing 2K television to display a video signal. In this case, an example is shown in which the color gamut is converted from "original image=BT.2020" to "image after conversion by the receiver=BT.709". The combination of No. 7 is an example in which the receiver is connected to the recording medium and the received program is recorded with reduced resolution. In this case, an example is shown in which the number of pixels is converted from "original video=4K" to "video after conversion by the receiver=2K". This makes it possible to record for a long time on a recording medium with limited capacity.

Considering the compliance rules based on the use cases assumed as described above, for example, the following rules are assumed.

The original video (video sent by broadcast waves) is “more advanced video (pixel count, Higher specs than general HD video in both brightness and color gamut)”, for example,
A) If the original video is a high-level video, apply a more advanced copy protection technology than the current one regardless of the video after conversion B) The video after conversion is
・In the case of current general HD video, current copy protection technology can be applied (can be used in combination with advanced copy protection technology),
・If at least one of the resolution, HDR/SDR, color gamut, etc. exceeds current general HD video, apply advanced copy protection technology.
C) If the video resolution after conversion is 2K or less, current copy protection technology can be applied (can be used in combination with advanced copy protection technology),
D) Regardless of whether the original video or the video after conversion does not require advanced copy protection technology, current copy protection technology can be applied (can be used in combination with advanced copy protection technology),
The 'advanced copy protection technology' in 'application of advanced copy protection technology' is, for example, DTCP2 as opposed to DTCP used in current output terminal interfaces. Compared to DTCP, DTCP2 has stronger compliance rules regarding robustness rules and authentication output destinations.

As the control bits for realizing the above rules and the requirements (compliance rules) required for the implementation of the receiver, for example, the combinations shown in FIG. 10 are conceivable.

FIGS. 9A, 9B, and 9C are examples of bit assignment when three bits are assigned as control bits in order to implement the copy control compliance rules A) to D) shown above. FIG. 9A shows the bit assignment of the most significant bit (b2) in the 3-bit (b2-b0) field, which is an advanced copy protection control flag indicating whether advanced copy protection is required. FIG. 9B shows bit assignment of the subsequent 1 bit (b1), which is a resolution control flag indicating whether or not resolution conversion is possible. FIG. 9C shows the bit assignment of the subsequent 1 bit (b0), and shows the HDR/SDR control flag indicating whether HDR/SDR conversion is possible.

FIG. 9D is for applying the copy protection technology according to the result of the conversion in the receiver when it is assumed that the receiver can convert resolution exceeding general HD, HDR/SDR, color gamut, etc. shows an example of requirements (compliance rules) required for receiver implementation realized by this bit assignment, using two bits b1-b0 in FIG. ) and another example of the compliance rule realized by the 3-bit bit assignment of FIG. 9C (b0).

In this way, as shown in FIG. 9C, control by assigning 2 bits (b1-b0) is also possible. By choosing, it is possible to control the requirements (compliance rules) required for the desired receiver implementation. FIG. 9D is an example in which 2-bit control is used to determine how the receiver is to obtain post-conversion copy protection technology, assuming that the receiver can convert resolution, color gamut, HDR/SDR, etc. is.

The 3-bit fields shown in FIGS. 9A, 9B, and 9C for realizing these compliance rules are expanded and assigned in any descriptor, or are assigned in a newly defined descriptor. must be assigned.

FIG. 11 shows an example in which the 3-bit fields shown in FIGS. 9A, 9B, and 9C are extended to the area indicated by 902 and allocated in the current content availability descriptor. After encryption_mode of the existing content usage descriptor, as advanced_copy_control_mode which is advanced copy protection control shown in FIG. 9A, resolution_control_mode which is resolution control shown in FIG. 9B, and dynamic_range_mode which is HDR/SDR control shown in FIG. 9C This is an example in which each 1 bit is assigned. These control bits should preferably be added after the bit assignment of the existing content use descriptor in consideration of compatibility, but the invention is not limited to this.

FIG. 12 shows an example in which a new descriptor (=content_conversion_descriptor) is defined and the 3-bit field shown in FIGS. 9A, 9B, and 9C is assigned to the area indicated by 1201. FIG. As in the case of FIG. 11, 1 bit each is assigned as advanced_copy_control_mode, resolution_control_mode, and dynamic_range_mode. It is desirable that the newly defined descriptor (=content_conversion_descriptor) be included in either the PMT, SDT, or EIT table, like the content usage descriptor.

9A, 9B, and 9C are examples in which three control bits are assigned, but the number of control bits is not limited to this.

FIG. 13A is an application example in which the control (b2) by advanced copy protection shown in FIG. 9A is expanded to 2 bits and the control bits are 4 bits. The most significant bit (b3) is an advanced copy protection control flag indicating whether or not advanced copy protection is required, similar to b2 shown in FIG. 9A. HDR/SDR, in the case of video where at least one of the color gamuts exceeds current general HD video, it is an advanced video protection control flag indicating whether or not "advanced copy protection technology is applied". A resolution control flag (b1) indicating whether resolution conversion is performed or not and an HDR/SDR control flag (b0) indicating whether or not HDR/SDR conversion is performed have the same definition as b1 and b0 shown in FIG. 9A. The bit string of the descriptor when the control bits are 4 bits is, for example, the content descriptor 902 shown in FIG. .

FIG. 13B is an example of a compliance rule when the HDR/SDR control flag (b0) shown in FIG. 13A is not specified in the descriptor (Don't care). This is because HDR features backward compatibility in the adoption of the Hybrid Log Gamma scheme, so it is assumed that there is no need to specify the HDR/SDR control flag in the descriptor. Also, the case where the resolution control flag (b1) shown in FIG. 13A is not specified (Don't care) is also an example of the compliance rule similar to FIG. 13B.

The following control bits may be added, which are not limited to the above examples. That is, in the above example, when considering resolution conversion based on 8K, it is also possible to specify the following with a plurality of bits (b1-b0).

As another compliance rule, when considering video with 8K resolution as a base, it is also possible to define resolution conversion with the following bit assignments (b1-b0).

b1, b0
11: Not convertible 10: Possible to convert to 4K, not possible to convert to 2K 01: Undefined 00: Possible to convert to 4K or less FIG. 14 illustrates processing on the transmitting side according to one embodiment. It is a flow chart. Before describing this flowchart, the relationship between the terms used in this flowchart and the terms used in other embodiments will be briefly described.

For example, the advanced copy protection control flag assigned to either FIG. 9A or FIG. 10 corresponds to the first designation information and is represented by 1 or multiple bits. Taking DTCP and AACS as examples of current copy protection schemes, DTCP2 and AACS2 can be considered as more advanced copy protection schemes. The first designation information is information for designating whether or not to use a copy protection method (such as DCTP2) that is more advanced than the current copy protection method (such as DCTP).

For example, the resolution control flag shown in either FIG. 9B or FIG. 10 corresponds to the second designation information and is expressed by 1 or multiple bits. The HDR/SDR control flag shown in either FIG. 9C or FIG. 10 corresponds to the third designation information and is expressed with 1 or multiple bits. Although not shown in any of FIGS. 9A, 9B, 9C, and 10, for example, flags indicating gradation, frame rate, colorimetry (color gamut) indicating the expression range of colors, etc. in FIG. It can correspond to specified information. Since both the second specification information and the third specification information are parameters for evolving the expression of the video, the second specification information and the third specification information are used as one specification information, and a plurality of bits are used. can be expressed. Similarly, the fourth designation information may also be combined with the second designation information or the third designation information, and may be represented by a plurality of bits as "single designation information regarding video quality".

In the following description of the processing flow, as the second specification information, flags indicating resolution control flags, HDR/SDR control flags, gradation in FIG. will be described as containing The second designation information does not contain these plural types of flags, the second designation information contains only the resolution control flag, and the third designation information contains only the HDR/SDR control flag. contains one flag, the processing flow itself is the same, only the processing (1402, 1403, 1502, 1503) for each designated information is executed in order in the processing flow shown below.

In the process (1400) on the transmission side, first, setting is made to the first designation information that designates whether or not the copy control method (DTCP/DTCP2 or AACS/AACS2) applicable to the video (program) to be controlled is applied. Determines the bit pattern to be used. Specifically, it determines whether any of the advanced copy protection control flags in FIGS. 9A to 10 is set to "1 (with advanced copy protection control)" or "0 (without advanced copy protection control)" ( 1401).

Next, second specification information specifying whether or not to convert parameters (resolution, gradation, frame rate, color gamut, luminance dynamic range, etc.) related to the quality of the video to be controlled is determined. Specifically, it is determined whether the resolution control flag and the HDR/SDR control flag in FIGS. 9B and 10 are set to "1 (convertible)" or "0 (convertible)" (1402).

At least one of the first designation information and the second designation information is set at a predetermined location of the broadcast wave (or transmission signal on the network) (1403). For example, the PMT (program map table) of MPEG-TS can be considered as the predetermined setting location. For MMT, an MPT (MMT package table) is conceivable.

In the case of a transmission signal on a network, a packet having a specific name (unique code) as a header is provided, the first designation information and/or the second designation information are described in the packet, and the packet with the specific name header is transmitted. It is conceivable to embed it in the transmission signal.

When the process of setting the first designation information and/or the second designation information for all videos (programs) to be controlled is completed (Yes in 1404), broadcast waves (or A transmission signal) is sent out at a predetermined timing (predetermined broadcast time frame or timing requested by a user on the receiving side) (1405).

FIG. 15 is a flowchart illustrating processing on the receiving side according to one embodiment. A broadcast wave (or transmission signal) in which at least one of the first designation information and the second designation information is set is received by a receiver at a predetermined timing (predetermined broadcast time frame, etc.) (1501). When the first specification information specifying whether or not to apply the set copy control method (DTCP2, etc.) is detected for each received video (program), processing (copy management) corresponding to the content of the descriptor is performed. It becomes executable (1502). When the first designation information is not detected, no processing (copy management) corresponding to the contents of the descriptor is performed.

When the second specification information, which is specification information related to the set video quality for each received video (program), is detected, processing (resolution conversion, dynamic range conversion, etc.) corresponding to the contents of the descriptor is performed. It becomes executable for each parameter (1503). If the second specification information is not detected, it depends on the definition of the default (state not specified in the descriptor), but if conversion is disabled by default, processing (resolution conversion , dynamic range conversion, etc.) are not performed. Note that when some of the video quality-related parameters, which may exist in multiple numbers, are detected from the second designation information, the corresponding processing (resolution conversion, dynamic range conversion, etc.) is performed individually for each detected parameter. It can be carried out.

If the received video (program) is reserved in advance, or if the user instructs recording of the currently received video (program) by remote control operation (Yes in 1504), recording ( or storage) is allowed. When there is no recording reservation and the user does not instruct recording (No in 1504), the processing in FIG. 15 ends.

When recording (or accumulation) is permitted by the set copy control method (Yes in 1505), the received video (program) is recorded using a recording medium such as an optical disc, and/ Alternatively, storage is performed using a storage medium such as a USB-HDD (1506). This recording (and/or storage) ends when the program ends (or when the remaining capacity of the recording medium/storage medium runs out) (Yes in 1507).

If viewing of the received video (program) has been reserved in advance, or if the user has instructed display of the currently received video (program) by operating the remote control or the like (Yes in 1508), whether viewing is permitted or not is checked. Checked (Watching pay TV for which you are not subscribed or watching parentally locked video is not permitted). If there is no viewing reservation and the user does not issue a display instruction (No in 1508), the processing in FIG. 15 ends.

When viewing is permitted (Yes in 1509), the received video (program) is displayed using the user's receiver (digital TV, etc.) (1510). This display ends when the program ends (or when the user switches the display source of the receiver or turns off the receiver) (Yes in 1511).

The pattern in which the receiver converts the video sent from the broadcasting station shown in FIG. 8 describes an example of down-conversion in the receiver. good too. In this case as well, the requirements (compliance rules) required for mounting the receiver may be determined according to the attributes of the peripheral device connected to the receiver.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof. Furthermore, in each constituent element of the claims, even if the constituent element is divided and expressed, a plurality of constituent elements are expressed together, or a combination of these is expressed, it is within the scope of the present invention. In addition, when the claims are expressed as control logic, when expressed as a program including instructions for executing a computer, and when expressed as a computer-readable recording medium in which the instructions are written, the apparatus of the present invention is applied. be.

101...Broadcasting station, 102...Broadcasting satellite/communication satellite, 110...Receiver, 120...Display device (4K), 121...Display device (2K), 130...HDD, 131 HDD, 140 removable media, 200 broadcasting station, 202 security function, 210 receiver, 213 security function, 214 basic function.

Claims (1)

First specification information specifying whether or not to use a copy protection system more advanced than the current copy protection system when outputting the received broadcast program from the receiving device , and the difference from the current broadcast due to the sophistication of video A receiving device that receives a 4K broadcast broadcast wave that adopts an encoded video format configured to arrange second designation information that designates whether or not the corresponding conversion is to be performed on the receiving side in the 8K broadcast broadcast wave There is
The broadcast waves of the 8K broadcast are MMT broadcast waves,
The sophistication of the video means that one or more parameters of resolution, pixel bit (gradation), frame frequency (frame rate), colorimetry (color gamut), and dynamic range are higher than the video of the current broadcast. indicates that
The first designation information and/or the second designation information is composed of descriptors that can be arranged in a PMT (program map table) for each broadcast program,
The second designation information includes control information indicating whether or not the one or more of the parameters can be converted on the receiving side of the broadcast wave,
the broadcast wave is an MMT broadcast wave,
Receiving means for receiving broadcast waves of 8K broadcasting according to the MMT method;
A processing means for processing based on the first designation information and the second designation information when processing the video included in the received broadcast wave,
When the advanced copy protection method is advanced copy protection control, the video resolution conversion is resolution control, and the video dynamic range conversion is DR control, based on the descriptor, among the requirements listed below: Receiving device, at least one of which is specified and executed in the above processing on the receiving side:
Requirement 1: Said advanced copy protection control is necessary, said resolution control is impossible;
Requirement 2: Said advanced copy protection control is unnecessary, said resolution control is impossible;
Requirement 3: The advanced copy protection control is necessary, and the resolution control is possible;
Requirement 4: The advanced copy protection control is unnecessary, and the resolution control is possible.

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