JP2021036696A - Receiving device - Google Patents

Abstract

To provide a receiving device with even greater variety since there is a wide range of expressions such as image color and contrast in content copy control.SOLUTION: A receiver 110 includes means that receives a broadcast wave in which at least one of first specified information that specifies whether a predetermined coded video format uses a copy protection method that is more advanced than the current copy protection method and second designated information that specifies whether a reception side performs conversion according to the difference from the current broadcast due to the sophistication of the video, display means that displays the video content of a broadcast wave that has undergone at least one of the processing based on the first designated information and the processing based on the second designated information, and means that outputs the video content of the broadcast wave that has undergone at least one of the processing based on the first designated information and the processing based on the second designated information from an output terminal according to a specific copy protection method.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a broadcast wave receiving device.

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

The output terminal of 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, specifically HDCP (High-bandwidth Digital Content Protection System) method at HDMI (registered trademark) terminal and DTCP (Digital Digital) at IP output that can share content viewing on home networks in the home The Transmission Content Protection) method is specified in the ARIB standard.

The removable media of 2) is a recording medium that is not tied to a receiver, such as a BD or an SD card, which enables the program to be played back by a device other than the receiver that received the program. As the copy control in this interface, specifically, the AACS (Advanced Access Content System) method in 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 or a USB-connected HDD, which enables the program to be played back only by the receiver that has received the program.

International Publication No. 2061/031911

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

In the copy control of contents based on the above-mentioned standards, since the range of expression such as the color and contrast of the image is widened, it is desired to realize a method having further diversity.

The broadcast wave receiving device of the present embodiment is a receiving device that receives a broadcast wave that adopts a predetermined coded video format, and the predetermined coded video format is a copy protection method that is more advanced than the current copy protection method. At least of the first designated information that specifies whether or not to use, and the second designated information that specifies whether or not to perform conversion on the receiving side according to the difference from the current broadcast due to the sophistication of video. Video content of the broadcast wave that has undergone at least one of a means for receiving the broadcast wave in which one designated information is arranged, a process based on the first designated information, and a process based on the second designated information. And the video content of the broadcast wave that has undergone at least one of the processing based on the first designated information and the processing based on the second designated information is output according to a specific copy protection method. It is a receiving device having a means for outputting from a terminal.

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 embodied. FIG. 3 is a diagram schematically showing an example of an environment to which the compliance rule of copy control is applied. FIG. 4A is a diagram showing a 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 usage descriptor. FIG. 5B is a diagram showing a bit assignment of retention_mode (temporary storage control), which is one of the components of the content usage descriptor shown in FIG. 5A. FIG. 6 shows a type of program sequence information table including the digital copy control descriptor and the content usage descriptor when the digital copy control descriptor and the content usage descriptor 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 the video format. 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 the control bit (b2) for realizing the requirement (compliance rule) required for receiver mounting when the broadcast wave includes copy control information regarding color gamut and brightness. FIG. 9B is an example of bit assignment of the control bit (b1) for realizing the requirement (compliance rule) required for the receiver implementation when the broadcast wave includes copy control information regarding the resolution. FIG. 9C is an example of bit assignment of the control bit (b0) for realizing the requirement (compliance rule) required for receiver mounting when the broadcast wave includes copy control information regarding color gamut and brightness. FIG. 9D realizes the requirements (compliance rules) required for receiver implementation when the broadcast wave includes copy control information regarding the case where the image quality of a general HD broadcast exceeds something (resolution, brightness, color gamut, etc.). It is a figure which showed an example of the bit assignment of the control bit (b1-b0) for this. FIG. 10 is a diagram showing another example of the requirement (compliance rule) required for the receiver mounting realized by the bit assignment shown in FIGS. 9A, 9B and 9C. FIG. 11 is a diagram showing an example of a content usage descriptor used for realizing the compliance rule on the receiver side when copy control of a video signal having various color gamuts and brightness is performed. .. FIG. 12 is a diagram showing an example of a newly defined descriptor used to realize the compliance rule on the receiver side when copy control of a video signal having various color gamuts and brightness is performed. Is. FIG. 13A is a diagram showing another example of the requirement (compliance rule) required for the receiver implementation realized by other bit assignment of the copy control information regarding the color gamut and the brightness of the broadcast wave. FIG. 13B is a diagram showing another example of the requirement (compliance rule) required for the receiver implementation realized by using a part of the bit assignment of the copy control information shown in FIG. 13A. FIG. 14 is a flowchart illustrating processing on the transmitting side according to the embodiment. FIG. 15 is a flowchart illustrating processing on the receiving side according to the embodiment.

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

First, the outline leading to the idea of the present embodiment will be described. In 2K broadcasting, it is possible to operate video signals with the following abilities according to the above-mentioned documents that can be broadcast as higher-level video signals than the current broadcasting (Note that the ability information of the current method 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, interlaced)
In addition to the above, in 4K and 8K, in addition to the above,
Resolution: 4K and 8K (2K)
Frame frequency: 120Hz (30Hz)
Current general HD (High Definition) broadcasting is broadcasting with resolution 2K, pixel bit (gradation): 8bit, colorimetry (color gamut): BT.709, SDR, frame frequency 30 / 1.01Hz, 30Hz. There is, but the resolution exceeds this: 4K and 8K, pixel bit: 10 bits, colorimetric: BT.2020 (xvYCC is also possible with 2K SDR broadcasting for communication), HDR, frame rate: 60 / 1.01Hz, 60Hz , 120 / 1.001Hz, 120Hz can be operated.

Reception with these parameters of "resolution", "pixel bit (gradation)", "color gamut", "dynamic range (HDR / SDR"", and "frame frequency" that exceed the current general HD broadcasting. It is necessary to consider whether to allow or disable the conversion of the parameters of the program according to the purpose of use by the receiver. Also, before and after the parameter conversion, connect to the receiver. It is also necessary to consider providing a control bit indicating whether or not a copy control method more advanced than the current 2K broadcasting is required when outputting to a device or recording to removable media.

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

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

Further, the receiver 110 is an output terminal and a removable interface, which are the three types of interfaces described above, based on the information on the protection (copy control) of the program included in the transmission control signal and the attribute information of the connected peripheral device. Copy control processing is executed on the media and storage medium.

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

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

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

The broadcasting station 200 transmits a video signal and an audio signal compressed and multiplexed in the MPEG2 format, and a transmission control signal described in Non-Patent Document 2 and Non-Patent Document 3 accompanying them as a broadcast signal by radio waves. The transmission control signal includes program specific information (PSI, Program Specific Information) and program sequence information (SI, Service Information). The specific program information is information necessary for specifying a desired program from a stream of multiplexed video signals and audio signals. The program arrangement information is various information defined for convenience when the receiver selects a program. The broadcast signal may be any of a terrestrial broadcast signal, a BS broadcast signal, and a CS broadcast signal.

The broadcasting station 200 operates the broadcasting station server 201. The broadcasting station server 201 stores the program title, the program ID, the program outline, the performers, the broadcasting date and time, and other information associated with the program to be broadcast, and provides the receiver 210 with the information.

The security function 202 sets the protection (copy control) of the program included in the broadcast wave transmitted by the broadcasting station. The specific contents of the copy control will be described with reference to FIGS. 4A to 13.

The receiver 210 includes a basic function 214 and a security function 213. It also includes 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. The application 211 and the API 212 may be provided in the receiver 210 in advance, or the user of the receiver 210 may install the application 211 and the API 212 in the receiver 210 at an arbitrary timing. Alternatively, the receiver 210 itself may automatically install the information based on the information acquired via the broadcast wave or the information acquired via the network (not shown).

The basic function 214 is a basic function of the receiver, receives a broadcast wave sent from the broadcast station 200, separates a video signal, an audio signal, and an accompanying transmission control signal included in the broadcast wave, and performs a video. Decodes signal and audio signals and analyzes transmission control signals. Further, the basic function 214 connects to peripheral devices connected to the receiver 210, for example, a display device 220, an HDD (HradDiscDrive) 230 bound to the display device 220, a removable media 240, and a smartphone 250, and transmits / receives data. To manage.

The security function 213 reads the transmission control signal analyzed by the basic function 214, and analyzes the information related to the protection (copy control) of the program set by the broadcasting station 200 included in the transmission control signal. The security function 213 is provided in the output terminal, removable media, and storage medium, which are the three types of interfaces described above, based on the analysis result of the copy control information and the attribute information of the peripheral device connected to the receiver 210. Executes copy control processing.

Regarding the copy control process, take as an example the case where the receiver 210 outputs the video signal sent from the broadcasting station 200 to the display device (resolution is 2K, brightness is not HDR compatible, color gamut is BT.709) 220. explain.

The video signal sent from the broadcast wave has a resolution of 4K, a brightness of HDR, and a color gamut of BT. Let it be 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 the information on the protection (copy control) of the program analyzed by the security function 213, and sets the resolution from 4K to 2K, the brightness from HDR to SDR, and the color gamut from BT. It is determined whether or not the program after conversion from 2020 to BT.709 can be output, and if output is possible, the converted video signal is output to the display device 220.

Similarly, the case where the receiver 210 records the video sent from the broadcasting station 200 on the 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 according to the attribute of the BD in the program sent from the broadcasting station for recording on the BD. Therefore, the basic function 214 receives the information on the protection (copy control) of the program analyzed by the security function 213, and sets the resolution from 4K to 2K, the brightness from HDR to SDR, and the color gamut from BT. It is determined whether or not the program can be recorded after the conversion from 2020 to BT.709, and if recording is possible, the converted video signal is recorded on the BD.

The application 211 and the API 212 have a function of making the function of the receiver 210 user-friendly. These functions can be updated sequentially, thereby improving the usability of the user of the receiver 210.

The receiver 210 can be connected to a display device 220 for displaying the received program and a BD (registered trademark) or SD (registered trademark) which is a recording medium 240 for recording the received program. Further, the receiver 210 can be 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. ..

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

As shown in FIG. 1, the smartphone 250 shown in FIG. 2 may be a smartphone 150 having a resolution of, for example, 4K as shown in FIG. Regarding the color gamut, for example, BT. A smartphone 150 having 2020 may be used. As for the brightness, as shown in FIG. 1, for example, a smartphone 150 that does not support HDR may be used.

In the present embodiment, regarding the implementation of the compliance rule that has been conventionally defined, by further adding information on the color gamut and brightness as judgment factors, the attributes of the peripheral device connected to the receiver and the attributes of the received program can be determined. , 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 for copy control in the three interfaces shown above are applied. The receiver 210 that has received the broadcast signal sent from the broadcast station 200 is specified in ARIB (Non-Patent Documents 1, 5, and 6) to output the received broadcast signal to the connected peripheral device. It must be output in accordance with the content protection regulations that have been made.

As described above, the content protection regulations are defined for the three interfaces of the output terminal, the removable media, and the storage medium.

The protection of the content recorded on the removable media or storage medium is for the received program according to the copy control information specified in the digital copy control descriptor and the content usage descriptor included in the transmission control signal sent from the broadcasting station. It is a mechanism to limit the number of copies and temporary storage time.

Content protection via the output terminal eliminates the intervention of a third party to illegally acquire programs by performing connection authentication and encrypted communication between the output terminal of the receiver and the output destination device. It is a mechanism. As a mechanism for preventing a third party from intervening and illegally acquiring a program, for example, the HDCP method and the DTCP method are specified.

4A and 4B show the data structure of the digital copy control descriptor defined in Non-Patent Document 2 and the bit assignment of the digital copy control information which is a component thereof. The digital copy control descriptor indicates information that controls the copy generation in the digital recording device, and when digital recording is expected to be performed, the broadcasting station that is the program producer provides information on the recording or copying of the program. Used to tell the receiver.

In the digital copy control descriptor, there are 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 3rd byte from the beginning of the digital copy control descriptor are assigned, and the 2 bits have the meaning of "description" shown in FIG. 4B. It is assigned. For example, the “business operator definition” of bit assignment = 01 indicates that the business operator defines the content of copy control independently. Further, "only one generation can be copied" with bit assignment = 10 indicates that the received program can be recorded (copy of the first generation), but the recorded program cannot be duplicated.

FIGS. 5A and 5B also show the data structure of the content utilization descriptor defined in Non-Patent Document 2 and the bit assignment of the temporary storage allowable time which is a component in the data structure. The content usage 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.

The content usage descriptor is also a bit assignment that has the meaning shown in the "data structure". Taking retention_state (allowable time for temporary storage) as an example, the bits from the beginning of the third byte to the fifth to the seventh bit of the content usage descriptor are assigned, and the three bits are shown in FIG. 5B. It is a bit assignment that has the meaning of "description". Taking image_constraint_token (resolution limit bit) as an example, if the 3rd bit from the beginning of the 3rd byte from the beginning of the content usage descriptor is assigned and the field is "0", the output video signal This means that you need to limit the resolution.

These digital copy control descriptors and content usage descriptors are included in the program sequence information table and sent from the broadcasting station.

FIG. 6 shows the types of a table of program specific information or program sequence information including a copy control descriptor and a content usage descriptor. The PMT (Program Map Table) is a table that specifies packet identification of TS packets that transmit each coded signal that constitutes a broadcast program. The SDT (Service Description Table) is a table for transmitting information related to the organization channel, such as the name of the organization channel and the name of the broadcasting company. The EIT (Event Information Table) is a table for instructing information about a program such as a program name, a broadcast date and time, and an explanation of the contents.

FIG. 7 is a diagram conceptually showing the direction of evolution of the video format from five viewpoints. There are three viewpoints of resolution evolution: two-dimensional resolution (plane resolution), three-dimensional resolution (gradation), and four-dimensional resolution (frame rate). On the other hand, as the direction of evolution of the expression range, there are a color expression range and a brightness expression range. Therefore, as mentioned in the explanations of FIGS. 1 and 2, the present embodiment is connected to the receiver by adding information on the color expression range (color gamut) and the brightness expression range to the copy control compliance rule. Depending on the attributes of the peripheral device and the attributes of the received program, it is possible to perform more detailed copy control including the color gamut and brightness.

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. 1 and 2, the peripheral device outputs or records the video signal. An example of a conversion pattern for converting an image according to various attributes of the image is shown. The "original video" represents the attributes of the video signal sent from the broadcasting station. "Video converted by the receiver" represents the attributes of the converted video signal obtained by converting the video signal sent from the broadcasting station by the receiver according to the attributes of the peripheral devices connected to the receiver. There is. For example, the combination of No. 1 is an example in which a 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 converted by the receiver = BT.709". Further, the combination of No. 7 is an example in which the receiver is connected to the recording medium to reduce the resolution and record the received program. In this case, an example is shown in which the number of pixels is converted from "original video = 4K" to "video converted by the receiver = 2K". This makes it possible to record for a long time on a recording medium having a 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 wave) is more advanced than the current general HD (High Definition) video (number of pixels = 2K, brightness = SDR, color gamut = BT.709). In the case of "images with higher brightness and color gamut specifications than general HD images)", for example
A) If the original video is an advanced video, apply more advanced copy protection technology than the current one regardless of the converted video. B) The converted video is
-For current general HD video, the 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. is an advanced image that exceeds the current general HD image, apply advanced copy protection technology.
C) If the resolution of the converted video is 2K or less, the 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 converted video, advanced copy protection technology is not required and the current copy protection technology can be applied (can be used in combination with advanced copy protection technology).
The "advanced copy protection technology" of "applying the advanced copy protection technology" is, for example, DTCP2 for DTCP used in the interface of the current output terminal. Compared to DTCP, this DTCP2 has stronger robustness rules and compliance rules regarding authentication output destinations.

As a requirement (compliance rule) required for mounting the control bit and the receiver for realizing the above rule, for example, a combination as shown in FIG. 10 can be considered.

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

FIG. 9D shows that the copy protection technology is applied according to the conversion result of the receiver on the premise that the resolution, HDR / SDR, color gamut, etc. exceeding HD, which is common in the receiver, can be converted. An example of the requirements (compliance rules) required for receiver mounting realized by this bit assignment is shown by using 2 bits of b1-b0. FIG. 10 shows FIGS. 9A (b2) and 9B (b1). ) 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 2-bit (b1-b0) bit assignment is also possible, and the definition of the bit to be assigned and the number of bits are appropriately defined according to the required requirements. By selecting it, it is possible to control the requirements (compliance rules) required for the receiver implementation required. FIG. 9D shows an example in which how to obtain the converted copy protection technology from the receiver is controlled by 2 bits on the premise that the resolution, color gamut, HDR / SDR, etc. can be converted by the receiver. Is.

The 3-bit fields shown in FIGS. 9A, 9B, and 9C above for implementing these compliance rules can be extended and assigned in one of the descriptors, or in a newly defined descriptor. Need to be assigned.

FIG. 11 shows an example in which the 3-bit fields shown in FIGS. 9A, 9B and 9C are expanded and assigned to the area shown in 902 in the current content utilization descriptor. After encryption_mode of the existing content usage descriptor, advanced_copy_control_mode which is the advanced copy protection control shown in FIG. 9A, resolution_control_mode which is the resolution control shown in FIG. 9B, and dynamic_range_mode which is the HDR / SDR control shown in FIG. 9C. This is an example in which one bit is assigned to each. It is desirable, but not limited to, these control bits to be added after the bit assignment of the existing content usage descriptor in consideration of compatibility.

FIG. 12 shows an example in which a descriptor (= content_conversion_discriptor) is newly defined and the 3-bit fields shown in FIGS. 9A, 9B and 9C are assigned to the area shown in 1201. 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_discriptor) is included in any of the PMT, SDT, and EIT tables as well as the content usage descriptor.

9A, 9B, and 9C are examples in which control bits are assigned by 3 bits, but the number of control bits is not limited to this.

FIG. 13A is an application example in which the control (b2) by the advanced copy protection shown in FIG. 9A is extended to 2 bits and the control bit is set to 4 bits. The most significant bit (b3) is an advanced copy protection control flag indicating the necessity of advanced copy protection as in b2 shown in FIG. 9A, and the subsequent bit (b2) is a control bit used in combination with b3. In the case of HDR / SDR and video in which at least one of the color regions exceeds the current general HD video, the advanced video protection control flag indicating the necessity of "apply advanced copy protection technology" is used. The resolution control flag (b1) indicating the presence / absence of resolution conversion and the HDR / SDR control flag (b0) indicating the presence / absence of HDR / SDR conversion have the same definitions as b1 and b0 shown in FIG. 9A. As for the bit string of the descriptor when the control bit is 4 bits, for example, the content descriptor 902 shown in FIG. 11 is composed of four 1-bit control flags, and 901 may be changed to 4 bits accordingly. ..

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 is characterized by backward compatibility by adopting the Hybrid Log Gamma method, so it is assumed that it is not necessary to specify the HDR / SDR control flag in the descriptor. Further, when the resolution control flag (b1) shown in FIG. 13A is not specified (Don't care), the same compliance rule as in FIG. 13B is used as an example.

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

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

b1, b0
11: Conversion not possible 10: Conversion to 4K is possible, conversion to 2K is not possible 01: Undefined 00: Conversion to 4K or less is possible FIG. 14 describes the processing on the transmitting side according to one embodiment. It is a flowchart. Before going into the description of this flowchart, the relevance of the terms used in this flowchart to 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 specified information and is represented by one or a plurality of bits. Taking DTCP or AACS as an example of the current copy protection method, DTCP2 or AACS2 can be considered as a more advanced copy protection method. The first designated information is information for designating whether or not to use a copy protection method (DCTP2 or the like) higher than the current copy protection method (DCTP or the like).

For example, the resolution control flag shown in either FIG. 9B or FIG. 10 corresponds to the second designated information and is represented by one or more bits. The HDR / SDR control flag shown in either FIG. 9C or FIG. 10 corresponds to the third designated information and is represented by one or more bits. Although not shown in any of FIGS. 9A, 9B, 9C or 10, for example, a flag indicating the gradation, frame rate, colorimetry (color gamut) indicating the color expression range of FIG. 7 and the like are also the fourth. It can correspond to the specified information. Since both the second designated information and the third designated information are parameters for evolving the expression of the video, the second designated information and the third designated information are used as one designated information in a plurality of bits. It may be expressed. Similarly, the fourth designated information may be expressed by a plurality of bits as "one designated information regarding video quality" together with the second designated information or the third designated information.

In the following description of the processing flow, as the second designated information, the resolution control flag, the HDR / SDR control flag, the gradation in FIG. 7, the frame rate, the colorimetry (color gamut) indicating the color expression range, and the like are shown. Will be described as including. Note that the second designated information does not include these plurality of types of flags, the second designated information includes only the resolution control flag, the third designated information includes only the HDR / SDR control flag, and so on. Even when each flag is included, the processing flow itself is the same only by sequentially executing the processing (1402, 1403, 1502, 1503) for each designated information in the processing flow shown below.

In the processing (1400) on the transmitting side, first, the copy control method (DTCP / DTCP2 or AACS / AACS2) applicable to the video (program) to be controlled is set as the first designated information for specifying whether or not to apply. Determine the bit pattern to be used. Specifically, it is determined whether the advanced copy protection control flag of any of FIGS. 9A to 10 is set to "1 (with advanced copy protection control)" or "0 (without advanced copy protection control)" (). 1401).

Next, the second designation information for designating whether or not the parameters (resolution, gradation, frame rate, color gamut, luminance dynamic range, etc.) related to the quality of the image to be controlled can be converted 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 (non-convertible)" or "0 (convertible)" (1402).

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

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 specified information and / or the second specified information is described in the packet, and the packet with the specific name header is described. It may be embedded in the transmission signal.

When the process of setting the first designated information and / or the second designated information for all the video (programs) to be controlled is completed (Yes of 1404), the broadcast wave (or the broadcast wave) including the set information is completed. The transmission signal) is transmitted at a predetermined timing (a predetermined broadcast time frame or a timing when a request is received from a user on the receiving side) (1405).

FIG. 15 is a flowchart illustrating processing on the receiving side according to the embodiment. The broadcast wave (or transmission signal) in which at least one of the first designated information and the second designated information is set is received by the receiver at a predetermined timing (such as a predetermined broadcast time frame). Is done (1501). When the first specified information that specifies whether or not the set copy control method (DTCP2, etc.) is applied to each received video (program) is detected, the process (copy management) corresponding to the contents of the descriptor is performed. It becomes feasible (1502). When the first specified information is not detected, the process (copy management) corresponding to the contents of the descriptor is not performed.

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

When the received video (program) is reserved in advance or the user instructs the recording of the currently received video (program) by remote control operation (Yes of 1504), the recorded video (program) is recorded by the set copy control method (Yes). Or it is checked whether accumulation) is allowed. When there is no recording reservation and the user does not give a recording instruction (No. 1504), the process of FIG. 15 ends.

When recording (or storage) is permitted by the set copy control method (Yes of 1505), the received video (program) is recorded using a recording medium such as an optical disk, 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 recording medium / storage medium runs out of stock) (Yes in 1507).

When the received video (program) is reserved for viewing in advance, or when the user instructs the display of the currently received video (program) by remote control operation (Yes of 1508), whether or not viewing is permitted. Checked (Watching unsubscribed pay-TV and viewing locked video is not allowed). When there is no viewing reservation and the user does not give a display instruction (No. 1508), the process of FIG. 15 ends.

When viewing is permitted (Yes of 1509), the received video (program) is displayed using a user's receiver (digital TV or the like) (1510). This display ends when the program ends (or when the user switches the display source of the receiver or turns off the power of 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, but is not limited to this, and up-conversion conversion in the receiver is performed. May be good. In this case as well, the requirements (compliance rules) required for mounting the receiver may be defined according to the attributes of the peripheral devices connected to the receiver.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof. Furthermore, in each of the constituent elements of the claim, even if the constituent elements are divided and expressed, a plurality of the constituent elements are expressed together, or a combination of these is expressed, it is within the scope of the present invention. Further, the apparatus of the present invention is applied even when the claim is expressed as a control logic, when it is expressed as a program including an instruction for executing a computer, and when it is expressed as a computer-readable recording medium in which the instruction is described. is there.

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)

In a receiving device that receives a broadcast wave that employs a predetermined coded video format,
First designation information that specifies whether or not the predetermined coded video format uses a copy protection method that is higher than the current copy protection method, and conversion according to the difference from the current broadcast due to the sophistication of the video. A means for receiving the broadcast wave in which at least one of the second designated information for designating whether or not the reception side is arranged is arranged.
A display means for displaying the video content of the broadcast wave that has undergone at least one of the processing based on the first designated information and the processing based on the second designated information.
A means for outputting the video content of the broadcast wave that has undergone at least one of the processing based on the first designated information and the processing based on the second designated information from the output terminal according to a specific copy protection method. Receiver with.

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