JP2015139175A - Transmitter, transmission method, receiver, and reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an advanced service of area broadcast.SOLUTION: A transmitter 10 acquires additional information used for service of area broadcast and information descriptor containing meta information regarding the additional information, and generates transport stream multiplexed based on a file type provided from video data, audio data and a file-processing unit 107. A transmission unit 109 transmits the generated transport stream via an antenna 110 by a broadcast wave of area broadcast.

Description

  The present technology relates to a transmission device, a transmission method, a reception device, and a reception method, and in particular, a transmission device, a transmission method, a reception device, and a reception method that can provide a more advanced area broadcasting service. About.

  In terrestrial digital broadcasting, a frequency band of about 6 MHz in the UHF (Ultra High Frequency) band is divided into 13 segments, of which 12 segments are broadcast to a fixed receiving terminal such as a television receiver. Then, in the remaining one segment, broadcasting for mobile receiving terminals, that is, one segment broadcasting (hereinafter also referred to as “one segment broadcasting”) is performed.

  Currently, in the one-segment broadcasting that is performed as a broadcast for mobile receiving terminals, the same content as that for a fixed receiving terminal is broadcast, and a central segment of 13 segments is used.

  After a complete transition from terrestrial analog broadcasting to terrestrial digital broadcasting, terrestrial digital broadcasting is performed on physical channels called channels 13 to 52 in the UHF band. However, in each region, not all of the 13 to 52 channels are actually used for terrestrial digital broadcasting. Therefore, an empty channel that is a physical channel not used for terrestrial digital broadcasting is generated.

  In recent years, methods for effectively using this empty channel have been studied. One of them is to use an arbitrary segment of an empty channel and receive the broadcast wave in an area of about several tens of meters to several kilometers centered on a transmission device that transmits the broadcast wave of one-segment broadcasting in an arbitrary segment. One-seg broadcasting (hereinafter referred to as “area broadcasting”) is performed as a broadcasting area that can perform broadcasting (see, for example, Patent Document 1).

JP 2011-2111627 A

  By the way, in the case of the conventional one-seg type area broadcasting, since the transmission capacity is limited, there is a limit to the services that can be provided, but in the future, various services can be provided by the advancement of area broadcasting. It is assumed that

  However, at present, a technical method for providing a more advanced area broadcasting service has not been established.

  The present technology has been made in view of such a situation, and makes it possible to provide a more advanced area broadcasting service.

  The transmission device according to the first aspect of the present technology includes a transmission unit that transmits a broadcast wave of an area broadcast that is broadcast by an arbitrary segment, and a first acquisition unit that acquires additional information used in the area broadcast service. A second acquisition unit that acquires an information descriptor including meta information related to the additional information, and the transmission unit transmits the information descriptor together with the additional information by a broadcast wave of the area broadcast.

  The information descriptor may be transmitted in a dedicated independent section.

  The additional information may be one or more contents, and the meta information may include information indicating an ID, a type, and a version of the contents.

  The meta information may further include information indicating a differential transmission flag indicating whether or not the data of the updated part of the stored content is differentially transmitted.

  The meta information may further include information indicating an ID of linked content executed in conjunction with the content.

  The meta information may further include information indicating a name of the content.

  The additional information may be one or more applications, and the meta information may include information indicating an ID of the application.

  The broadcast wave has a frequency band divided into 13 segments. One segment of the 13 segments is broadcast in one segment, and the additional information is transmitted in all segments or segments of any hierarchy. You can make it.

  The section can be specified by an identifier that can identify the section, which is arranged in the area broadcast descriptor included in a network information table (NIT) defined by a predetermined standard. .

  The transmission device may be an independent device or an internal block constituting one device.

  The transmission method according to the first aspect of the present technology is a transmission method corresponding to the transmission device according to the first aspect of the present technology described above.

  In the transmission device and the transmission method according to the first aspect of the present technology, a broadcast wave of an area broadcast that is a broadcast by an arbitrary segment is transmitted, additional information used in the area broadcast service is acquired, and the additional information An information descriptor including meta information is acquired, and the information descriptor is transmitted together with the additional information by the broadcast wave of the area broadcast.

  A receiving device according to a second aspect of the present technology includes a receiving unit that receives a broadcast wave in a broadcast area that can receive a broadcast wave transmitted from a transmitter that performs area broadcasting that is broadcast by an arbitrary segment. And a control unit that controls the operation of each unit that performs predetermined processing relating to the additional information, based on meta information relating to the additional information used in the area broadcasting service, included in the information descriptor obtained from the broadcast wave. Is provided.

  The information descriptor may be transmitted in a dedicated independent section.

  The additional information may be one or more contents, and the meta information may include information indicating an ID, a type, and a version of the contents.

  The meta information further includes information indicating a differential transmission flag indicating whether or not the data of the updated part of the accumulated content is differentially transmitted, and the control unit is configured to store the content that has been accumulated based on the meta information. Some data of can be updated.

  The meta information further includes information indicating an ID of linked content executed in conjunction with the content, and the control unit controls an operation of the linked content based on the meta information. it can.

  The meta information may further include information indicating the name of the content, and the control unit may display the name of the content based on the meta information.

  The additional information may be one or more applications, and the meta information may include information indicating an ID of the application.

  The broadcast wave has a frequency band divided into 13 segments. One segment of the 13 segments is broadcast in one segment, and the additional information is transmitted in all segments or segments of any hierarchy. You can make it.

  The section may be specified by an identifier that can identify the section, which is arranged in the descriptor for area broadcasting included in the NIT defined by a predetermined standard.

  The receiving device may be an independent device or an internal block constituting one device.

  The reception method according to the second aspect of the present technology is a reception method corresponding to the reception device according to the second aspect of the present technology described above.

  In the receiving device and the receiving method according to the second aspect of the present technology, in the broadcast area that can receive a broadcast wave transmitted from a transmitter that performs area broadcasting, which is broadcast by an arbitrary segment, the broadcast wave is transmitted. Based on the meta information regarding the additional information used in the area broadcasting service, which is received and included in the information descriptor obtained from the broadcast wave, the operation of each unit that performs a predetermined process regarding the additional information is controlled.

  According to the first aspect and the second aspect of the present technology, a more advanced area broadcasting service can be provided.

  Note that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

It is a figure explaining the outline | summary of the transmission system of the area broadcast to which this technique is applied. It is a figure which shows the system outline | summary and process image of area broadcasting to which this technique is applied. It is a figure which shows the example of the transmission format of the meta information contained in a stream data information section. It is a figure explaining the meaning of each field arrange | positioned at a stream data information section. It is a figure which shows the example of a format of a content information descriptor. It is a figure explaining the meaning of each field arrange | positioned at a content information descriptor. It is a figure which shows the example of a format of an application information descriptor. It is a figure explaining the meaning of each field arrange | positioned at an application information descriptor. It is a figure which shows the operation | movement sequence of a receiver. It is a figure which shows the protocol stack of area broadcasting. It is a figure explaining the detail of a difference transmission flag (diff flag). It is a figure which shows the example of difference accumulation | storage when Overwrite is designated as a difference transmission flag. It is a figure which shows the example of difference accumulation | storage when Replace is designated as a difference transmission flag. It is a figure explaining the outline | summary of area broadcasting. It is a block diagram showing one embodiment of an area broadcasting system to which the present technology is applied. It is a block diagram which shows one Embodiment of the transmitter which applied this technique. It is a block diagram which shows one Embodiment of the receiver to which this technique is applied. It is a block diagram which shows the detailed structural example of a control part. It is a flowchart explaining a transmission process. It is a flowchart explaining a 1st reception / accumulation | storage process. It is a figure which shows the example of a content list. It is a flowchart explaining a 2nd reception / accumulation | storage process. It is a figure which shows the example of a content list. It is a flowchart explaining a reproduction | regeneration process. It is a flowchart explaining a 3rd reception / accumulation | storage process. It is a flowchart explaining a 3rd reception / accumulation | storage process. It is a flowchart explaining the detail of a difference transmission determination process. It is a figure which shows the structural example of a computer.

  Hereinafter, embodiments of the present technology will be described with reference to the drawings. However, description will be given in the following order.

1. 1. Transmission method for area broadcasting to which this technology is applied 2. Transmission of differential content in area broadcasting to which this technology is applied System configuration 4. 4. Specific processing flow performed in each device Computer configuration

<1. Area broadcasting transmission method using this technology>

(Overview of area broadcasting transmission methods using this technology)
FIG. 1 is a diagram illustrating an outline of an area broadcasting transmission method to which the present technology is applied.

  In terrestrial digital broadcasting, the frequency band of about 6 MHz in the UHF band is divided into 13 segments, and broadcasting for fixed receiving terminals such as television receivers is performed in 12 segments (B layer) of them. In addition, one-segment broadcasting for mobile receiving terminals is performed in the remaining one segment (A layer).

  In normal area broadcasting, a broadcast wave of one-segment broadcasting is transmitted in one central segment. However, since the transmission capacity is limited, there is a limit to the services that can be provided. Therefore, in the present technology, information (hereinafter referred to as “additional information”) for providing a service for more advanced area broadcasting (hereinafter also referred to as “advanced area broadcasting”) is defined, 13 segments are used for transmission.

  A receiver such as a portable receiving terminal receives additional information such as contents and applications together with contents of one-segment broadcasting from a transmitter capable of transmitting area broadcasting. The receiver can receive and reproduce additional information such as content, or can receive and accumulate additional information such as content and reproduce it.

  Here, the additional information includes AV (Audio Visual) streaming in PES (Packetized Elementary Stream) format, various data in IP (Internet Protocol) format, and the like, and is transmitted by being included in a broadcast wave of area broadcasting. As data in the PES format, for example, stream data for real-time content such as extended video and extended audio can be transmitted. Further, as data in the IP format, for example, stored content data such as video files and audio files can be transmitted. Further, data such as a still image file, a text file, and an application may be transmitted as IP format data.

  Then, a process using various kinds of additional information is executed in the receiver, so that a user possessing the receiver can receive provision of a more advanced area broadcasting service.

(System overview and processing image of area broadcasting using this technology)
FIG. 2 is a diagram illustrating a system overview and processing image of area broadcasting to which the present technology is applied.

  As shown in FIG. 2, TS (Transport Stream) includes data of layer A and layer B multiplexed. The A layer includes PSI / SI (Program Specific Information / Service Information) in addition to the one-segment service stream. PSI / SI includes PMT and NIT. A PMT (Program Map Table) stores each PID (Packet Identification) such as video data and audio data included in the program.

  The NIT (Network Information Table) stores information about a network to be transmitted, such as a channel number, a modulation method, and a guard interval. The NIT includes an area broadcast information descriptor. For example, the area broadcast information descriptor describes information related to a transmitter that transmits a broadcast wave of area broadcast. Further, additional service info is described in the area broadcast information descriptor.

  In additional service info, PID (Packet Identification) of the stream data information section is described. Here, “0x1800” is described as the PID of the section data of the meta information transmitted in the dedicated independent section. As a result, the receiver can acquire the section data with PID = "0x1800" from the data in the B layer.

  In the stream data information section acquired in this way, the content information descriptor 1, the content information descriptor 2, and the content information descriptor are added to the meta information descriptor loop related to the transmission content. Three types of content information descriptors 3 are described. In addition to the content information descriptor, an application information descriptor describing application meta information can be described in the meta information descriptor loop, but the description thereof is omitted here.

  Each content information descriptor describes meta information of each content and PID of ES (Elementary Stream) constituting the content.

  In the content information descriptor 1, “0x601” (AAC) and “0x600” (AVC) are described as PID, and “0x602” is described as PCR_PID. Based on the content information descriptor 1, the receiver extracts the ES with PID = "0x601" (AAC) and the ES with PID = "0x600" (AVC) from the data in the B layer, Data of content 1 can be acquired. Also, a PCR (Program Clock Reference) with PCR_PID = "0x602" is obtained.

  In the content information descriptor 2, “0x800” (ULE) is described as the PID. The receiver can acquire the data of the content 2 by extracting the ES of PID = “0x800” (ULE) based on the content information descriptor 2.

  In the content information descriptor 3, “0x801” (ULE) is described as the PID. The receiver can acquire the data of the content 3 by extracting the ES of PID = “0x801” (ULE) based on the content information descriptor 3.

  In FIG. 2, “0x1B” indicates a video stream in the PES format, and “0x1F” indicates an audio stream in the PES format. “0x91” indicates accumulated data (IP format data or FLUTE (File Delivery over Unidirectional Transport) format file data), and “0x0D” indicates a data carousel.

  When transmitting additional information such as content, in addition to the data itself, meta information indicating the content and usage method of the additional information, such as title, structure, size, validity period, and rights information, is stored in a dedicated independent section. Since it is transmitted, the receiver can perform a predetermined process related to the additional information using the meta information related to the additional information.

(Meta information transmission format)
FIG. 3 is a diagram illustrating an example of a transmission format of the meta information of FIG.

  As described above, meta information is transmitted in a stream data information section. FIG. 4 shows the meaning of each field arranged in the stream data information section, which will be described with reference to it as appropriate.

  table_id is an 8-bit field and indicates the id of the table. section_syntax_indicator consists of a 1-bit field and indicates a section syntax instruction. section_length consists of a 12-bit field and indicates the section length. table_id_extension consists of a 16-bit field and indicates a table identification extension.

  version_number is a 5-bit field and indicates a version number. current_next_indicator is a 1-bit field and indicates a current next instruction. section_number consists of an 8-bit field and indicates the section number. last_section_number consists of an 8-bit field and indicates the last section number.

  Note that the last_section_number from the table_id is defined by STD B10 of the ARIB (Association of Radio Industries and Broadcast) standard, and is arranged in the section header.

  descriptors_loop_length consists of a 16-bit field, and specifies the total byte length of the subsequent descriptor (descriptor) that ends immediately before the first byte of CRC_32. In descriptor (), information descriptors such as a content information descriptor (Contents Information Descriptor) and an application information descriptor (Application Information Descriptor) are described.

  However, one information descriptor is allocated to one content information descriptor. Similarly, one information descriptor is assigned to one application information descriptor. In addition, there is no particular upper limit on the number of information descriptors to be arranged. Therefore, the content information descriptor is transmitted by the number of contents to be transmitted.

  Note that the content information descriptor and the application information descriptor are an example of a meta information descriptor group related to additional information, and other information descriptors corresponding to the type of additional information may be arranged.

  CRC_32 is a 32-bit field, and includes a CRC value such that the register output becomes zero after the entire section is processed in the decoder.

(Content information descriptor format)
FIG. 5 is a diagram showing an example of the format of the content information descriptor (Contents Information Descriptor) of FIG. FIG. 6 shows the meaning of each field arranged in the content information descriptor, and will be described with reference to it as appropriate.

  The descriptor tag consists of an 8-bit field and indicates the table identification. The descriptor length consists of a 12-bit field and indicates the size of the information descriptor.

  The content id is a 16-bit field and indicates the content ID. The content type is an 8-bit field and indicates the content type. The content size consists of a 32-bit field and indicates the size of the content. The content version is an 8-bit field and indicates the content version.

  The security level consists of a 2-bit field and indicates the content protection level. For example, when “00” is designated in the security level, it indicates that the content is not encrypted. If “01” is designated, it indicates that the content is encrypted at level 1. Also, for example, when “10” is specified for the security level, the content is encrypted at level 2, and when “11” is specified, the content is encrypted at level 3. Indicates that In addition, although it is an encryption level, it can be set as a thing with higher encryption strength, for example, the level with a larger number.

  The diff flag consists of a 2-bit field and indicates a differential transmission flag. For example, when “00” is designated in the diff flag, it indicates that differential transmission is not performed. When “01” is designated, it indicates that the difference data is overwritten on the accumulated content. When “10” is designated, it indicates that difference data is to be replaced for the accumulated content. Details of the differential transmission flag will be described later.

  The expire date is a 16-bit field and indicates the content expiration date. The content ad id is a 16-bit field, and indicates a linked content ID of content (hereinafter referred to as “linked content”) executed in conjunction with the content specified by the content ID.

  PCR_PID is a 13-bit field and indicates PID (Packet Identification) for transmitting PCR (Program Clock Reference). However, when PCR is not used, “0x1FFF” is specified. The number of components is an 8-bit field, and indicates the number of ESs (Elementary Streams) (PID number) constituting the content. In this number of components loop, stream type and elementary PID are arranged. The stream type consists of an 8-bit field and indicates the stream format type. The elementary PID is a 13-bit field and indicates an elementary PID.

  Note that the PID, stream type, and elementary PID are defined by STB B10 of the ARIB standard.

  The content title length is an 8-bit field and indicates the character string length of the content name. In the content title length loop, title char is arranged. The title char is an 8 × N-bit field and indicates a character string of the content name. That is, the content title length and the title char specify a character string of the content name intended to be shown to the user.

  The content path length consists of an 8-bit field and indicates the character string length of the relative path. In the content path length loop, path char is arranged. The path char is an 8 × N bit field and indicates a character string of a relative path. That is, the relative path character string in the transmission content for location resolution, that is, the relative path to the top access file is specified by the content path length and the path char. For example, when the content is composed of an HTML (HyperText Markup Language) file set, the relative path of the index.html file is designated.

  The content linked URL length is an 8-bit field and indicates the length of the URL (Uniform Resource Locator) of the website. A url char is arranged in the loop of content linked URL length. The url char is an 8 × N bit field and indicates the URL of the WEB site. That is, the URL of the WEB site related to the content is specified by the content linked URL length and url char.

  CRC_32 is a 32-bit field, and includes a CRC value such that the register output becomes zero after the entire section is processed in the decoder.

(Application information descriptor format)
FIG. 7 is a diagram showing an example of the format of the application information descriptor (Application Information Descriptor) of FIG. FIG. 8 shows the meaning of each field arranged in the application information descriptor, and will be described with reference to it as appropriate.

  The descriptor tag consists of an 8-bit field and indicates the table identification. The descriptor length consists of a 12-bit field and indicates the size of the information descriptor.

  number of application indicates the number of application information. 0 to 31 is specified for number of application. However, when there is no application information, “0” is designated.

  The security level consists of a 2-bit field and indicates the protection level of the application. For example, when “00” is designated as the security level, this indicates that the application is not encrypted. When “01” is designated, it indicates that the application is level 1 encrypted. Also, for example, when “10” is specified as the security level, the application is encrypted at level 2, and when “11” is specified, the application is encrypted at level 3. Indicates that

  In addition, although it is an encryption level, it can be set as a thing with higher encryption strength, for example, the level with a larger number. In addition to the encryption strength, it may be possible to designate whether the application is charged or not.

  application id is a 30-bit field and indicates an application ID.

  The application title length is an 8-bit field and indicates the character string length of the application name. Title char is arranged in the loop of application title length. The title char is an 8 × N bit field and indicates a character string of the application name. That is, a character string of an application name is specified by application title length and title char.

  The application path length is an 8-bit field and indicates the character string length of the application acquisition destination URI (Uniform Resource Identifier). A path char is placed in the loop of application path length. The path char is an 8 × N bit field and indicates the application acquisition destination URI. That is, the application acquisition destination URI is specified by application path length and path char.

  CRC_32 is a 32-bit field, and includes a CRC value such that the register output becomes zero after the entire section is processed in the decoder.

(Receiver operation sequence)
FIG. 9 is a diagram illustrating an operation sequence of the receiver. In this operation sequence, as an example of the operation of the receiver, an operation when the content to be stored selected by the user is stored and an operation when the stored content is reproduced will be described.

  As shown in FIG. 9, in the receiver, when an application activation instruction is given by the user, the tuner is activated and a channel selection process is performed. Thus, the receiver receives a broadcast wave of real-time content according to the user's channel selection from a terrestrial broadcast station that performs normal one-segment broadcasting, and displays a normal one-segment broadcast program.

  In addition, when the receiver enters an area where a broadcast wave from an area broadcast station that performs area broadcast can be received, the receiver acquires an area broadcast information descriptor from the broadcast wave of the area broadcast. Then, the receiver acquires a stream data information section transmitted in a dedicated independent section according to the PID of additional service info described in the area broadcast information descriptor. In this stream data information section, a content information descriptor and an application information descriptor are arranged, and meta information related to additional information such as content and application is described.

  For example, the receiver acquires the name of the transmission content described in the content information descriptor and displays it on the display, thereby presenting a list of content names that can be stored to the user. When the user selects an item (item) indicating the desired content from the content list, accumulation of the selected content is started. As a result, the receiver acquires the content to be stored (additional information) from the broadcast wave of the area broadcast according to the PID described in the content information descriptor of the content to be stored, and stores it in the storage. In addition, during the accumulation of the content to be accumulated, the progress status is appropriately notified to the user. When the accumulation of the content to be accumulated is completed, the user is notified of the completion of the accumulation.

  In addition, when the user instructs the reproduction of the accumulated content, the receiver reads the content accumulated in the storage and reproduces the accumulated content. Further, when the user gives an instruction to end the application, the application ends. At the end of the application, the tuner is stopped.

  In this way, it is assumed that the broadcast wave of the area broadcast received by the receiver is transmitted according to the “advanced area broadcast” protocol stack shown in FIG. In the following description, a normal area broadcast service is also referred to as a “one seg service”, and an advanced area broadcast service is also referred to as a “one seg additional information service”.

<2. Transmission of differential content in area broadcasting using this technology>

  By the way, when the content components (objects, etc.) have already been transmitted and the same content as the stored content is transmitted, rather than transmitting all the components (objects, etc.) again, If only the components (objects, etc.) corresponding to the difference are sent, the transmission capacity and transmission time can be greatly reduced. For example, in the distribution of information that changes with time, such as news and announcement information at that time, it is efficient to distribute only the data of the updated portion.

  Therefore, in area broadcasting to which the present technology is applied, more advanced area broadcasting services are provided by performing differential transmission using the above-described meta information for content transmitted as additional information. Specifically, a difference transmission flag (diff flag) of the content information descriptor (FIG. 5) is used.

(Details of differential transmission flag)
FIG. 11 is a diagram for explaining the details of the differential transmission flag (diff flag).

  As shown in FIG. 11, the differential transmission flag is a 2-bit field. When “00” is designated in the diff flag, it indicates that the full set content, that is, differential transmission is not performed. Further, when “01” is designated in the diff flag, it indicates that overwrite (overwrite), that is, overwriting of the difference data is performed on the accumulated content. This Overwrite operation corresponds to overwriting of an object or addition of an object.

  Further, when “10” is designated in the diff flag, it indicates that the difference data is to be replaced for the replaced content, that is, the accumulated content. This Replace operation is equivalent to overwriting, adding, or deleting an object. Furthermore, diff flag = "11" indicates reserved, that is, it may be defined in the future.

  The Overwrite operation can be performed by performing the Replace operation. However, since it is assumed that the frequency of the overwrite operation is the highest in practice, this differential transmission flag is an independent item. Overwrite is suitable for replacement of fixed-length objects, fixed-size objects, objects with the same name, etc., which are very small or a small number of changes to the scale of all content components. .

(Differential accumulation for Overwrite)
FIG. 12 is a diagram illustrating an example of difference accumulation when Overwrite (diff flag = "01") is designated.

  In the “before differential transmission” on the left side of the figure, the content accumulated in the receiver is composed of a plurality of objects (for example, files) having a hierarchical structure. If attention is paid to an object group surrounded by a dotted line among the circular objects in the figure, the object A exists in the lower hierarchy of the object 4 with the pattern.

  Here, when the meta information of the content information descriptor specifies “01” as the diff flag and a location (for example, a relative path starting from the top object 1) pointing to the object 4 as the content path (path char) , The object in the lower hierarchy of the object 4 is overwritten.

  Further, in “difference transmission” in the center of the figure, objects A and B which are lower layers of the object 4 are transmitted as difference objects (for example, files). Note that the differentially transmitted objects A and B may be transmitted after being combined into one object using a ZIP file format or the like. However, in this case, after receiving the ZIP file, the receiver side needs to expand the ZIP file.

  When such “differential transmission” is performed, objects “A” and “B” which are lower layers of the object 4 among the plurality of objects constituting the content accumulated in the receiver in “after differential transmission” on the right side of FIG. Only the difference is accumulated. Specifically, the object A exists in the lower hierarchy of the object 4, but the objects A and B are transmitted differentially, and the objects are different before and after the differential transmission. In addition, since diff flag = "01" is specified, Overwrite, that is, an object before differential transmission is overwritten on an object after differential transmission.

  Accordingly, among the objects in the lower hierarchy of the object 4, the object A has existed before the differential transmission, and as a result, the object is overwritten (Overwrite). On the other hand, the object B does not exist before the differential transmission, and as a result, the object is added (Append). That is, in addition to object A, object B also exists in the lower hierarchy of object 4 after “differential transmission”. In the example of difference accumulation in FIG. 12, even if the object A before difference transmission is replaced with the object A after difference transmission (Replace), the same result is obtained.

  In this way, in the receiver, when updating the accumulated old content, instead of updating all the data of the component (e.g., object etc.), only the difference data of the updated part is transmitted and the configuration is made. By updating (for example, overwriting or adding) a part of data of an element, new content can be accumulated efficiently.

(Differential accumulation for Replace)
FIG. 13 is a diagram illustrating an example of difference accumulation when Replace (diff flag = “10”) is designated.

  In the “before differential transmission” on the left side of the figure, the content accumulated in the receiver is composed of a plurality of objects (for example, files) having a hierarchical structure. If attention is paid to an object group surrounded by a dotted line among the circular objects in the figure, objects A and B exist in the lower hierarchy of the object 3.

  Here, when the meta information of the content information descriptor specifies “10” as the diff flag and the location pointing to the object 3 as the content path (path char) (for example, a relative path starting from the top object 1) The object in the lower hierarchy of the object 3 is replaced.

  Further, in “difference transmission” in the center of the figure, objects X, Y, and Z that are lower layers of the object 3 are transmitted as difference objects (for example, files). Note that the differentially transmitted objects X, Y, and Z may be transmitted after being combined into one object using a ZIP file format or the like. However, in this case, after receiving the ZIP file, the receiver side needs to expand the ZIP file.

  When such “difference transmission” is performed, only the object that is a lower layer of the object 3 among the plurality of objects constituting the content accumulated in the receiver in the “after difference transmission” on the right side of FIG. Will be accumulated. Specifically, the objects A and B exist in the lower hierarchy of the object 3, but the difference transmission is the objects X, Y, and Z, and all the objects are different before and after the difference transmission. ing. Since diff flag = "10" is specified, Replace, that is, the object before the difference transmission is replaced with the object after the difference transmission.

  Therefore, among the objects in the lower hierarchy of the object 3, the objects A and B existed before the differential transmission, but do not exist after the differential transmission. As a result, the object is deleted. On the other hand, the objects X, Y, and Z do not exist before the differential transmission, but exist after the differential transmission. As a result, the object is added. That is, instead of the objects A and B, the objects X, Y, and Z exist in the lower hierarchy of the object 3 “after differential transmission”.

  In this way, in the receiver, when updating the accumulated old content, instead of updating all the data of the component (e.g., object etc.), only the difference data of the updated part is transmitted and the configuration is made. By updating (for example, adding or deleting) a part of data of an element, new content can be accumulated efficiently.

<3. System configuration>

  Next, a specific system configuration for realizing area broadcasting to which the present technology is applied will be described. Here, first, an overview of area broadcasting will be described with reference to FIG. However, in FIG. 14, in addition to the area broadcast stations 3-1 to 3-3 that transmit broadcast waves of area broadcast, the terrestrial broadcast station 2 that performs normal one-segment broadcast is shown.

  The terrestrial broadcasting station 2 is a broadcasting station that performs digital terrestrial broadcasting. The terrestrial broadcasting station 2 performs broadcasting for fixed reception terminals with 12 segments, and broadcasting for mobile reception terminals (normal one-segment broadcasting) with one segment.

  The area broadcast stations 3-1 to 3-3 are transmitters (corresponding to a transmission device 10 in FIG. 15 and the like described later) that transmit area broadcast broadcast waves, and any one or more of vacant channels of digital terrestrial broadcasting The broadcast wave of the area broadcast is transmitted in each of the segments.

  That is, the area broadcasting station 3-1 performs area broadcasting that can be received only in the broadcasting area A. The area broadcasting station 3-2 performs area broadcasting that can be received only in the broadcasting area B, and the area broadcasting station 3-3 performs area broadcasting that can be received only in the broadcasting area C. Here, the area broadcast includes, for example, a broadcast related to the theme park that can be received only at the theme park, a broadcast related to a store that can be received only in a certain ward or city, and the like. In area broadcasting, broadcasters can use the same frequency segment between area broadcast stations where broadcast areas do not overlap.

  That is, for example, in FIG. 14, the broadcast area A and the broadcast area B do not overlap, so the area broadcast station 3-1 in the broadcast area A and the area broadcast station 3-2 in the broadcast area B are the same. Area broadcasting can be performed in the frequency segment. In FIG. 14, the broadcast area B and the broadcast area C do not overlap, so the area broadcast station 3-2 in the broadcast area B and the area broadcast station 3-3 in the broadcast area C have the same frequency. Area broadcasting can be performed in the segment.

  However, in FIG. 14, the broadcast area A and the broadcast area C are partially overlapped, so the area broadcast station 3-1 in the broadcast area A and the area broadcast station 3-3 in the broadcast area C The same frequency segment cannot be used for area broadcasting (as long as broadcasting is performed simultaneously).

  For example, the receiving device 20 is a receiver that can receive both normal one-segment broadcasting and area broadcasting. For example, as illustrated in FIG. 14, when the user who has the receiving device 20 is in the broadcast area A, the receiving device 20 performs both normal one-segment broadcasting and area broadcasting by the area broadcasting station 3-1 in the broadcasting area A. Can be received. In the following description, in order to simplify the description, only the process for the receiving device 20 to receive the area broadcast will be described.

(Configuration of area broadcasting system)
FIG. 15 is a block diagram illustrating an embodiment of an area broadcasting system to which the present technology is applied.

  As illustrated in FIG. 15, the area broadcasting system 1 includes a transmission device 10, a reception device 20, and an additional information providing server 30. The receiving device 20 and the additional information providing server 30 are connected to each other via the Internet 90.

  The transmission device 10 transmits a broadcast wave of area broadcasting. However, as shown in FIG. 14, the broadcast wave of the area broadcast transmitted from the transmission device 10 can be received only in a predetermined broadcast area. The transmitting device 10 transmits additional information such as content and application together with area broadcast content in the broadcast wave of area broadcast.

  The receiving device 20 is a mobile receiving terminal that incorporates a tuner such as a mobile phone, a smartphone, or a tablet-type terminal device. The receiving device 20 receives the broadcast wave of the area broadcast from the transmitting device 10 when the user having the receiving device 20 is in the broadcasting area of the transmitting device 10. The receiving device 20 displays the content video obtained from the broadcast wave of the area broadcast on the display, and outputs sound synchronized with the video from the speaker.

  The receiving device 20 acquires additional information from the broadcast wave of the area broadcast, and performs a predetermined process regarding the additional information. For example, the receiving device 20 acquires content transmitted as additional information and stores it in the storage. In addition, when the reproduction of the accumulated content is instructed, the reception device 20 reads the accumulated content from the storage and reproduces it.

  The additional information providing server 30 provides additional information such as contents and applications via the Internet 90 in response to a request from the receiving device 20. The receiving device 20 acquires additional information provided from the additional information providing server 30 via the Internet 90, and performs a predetermined process regarding the additional information.

  In the configuration of FIG. 15, only one receiving device 20 is illustrated for simplicity of explanation, but in reality, the area broadcasting system 1 is configured to include a plurality of receiving devices 20. Each receiving device 20 receives the content of the area broadcast from the transmitting device 10.

  The area broadcasting system 1 is configured as described above. Next, with reference to the block diagrams of FIGS. 16 to 18, a configuration example of each device configuring the area broadcasting system 1 of FIG. 15 will be described.

(Configuration example of transmitter)
FIG. 16 is a block diagram illustrating a detailed configuration example of the transmission device 10 of FIG.

  In FIG. 16, the transmission apparatus 10 includes a control signal acquisition unit 101, a video data acquisition unit 102, a video encoder 103, an audio data acquisition unit 104, an audio encoder 105, a file data acquisition unit 106, a file processing unit 107, a multiplexer 108, and a transmission. The unit 109 and the antenna 110 are included.

  The control signal acquisition unit 101 acquires the control signal by generating a control signal such as PSI / SI and supplies it to the multiplexer 108 as section data. Further, the control signal acquisition unit 101 acquires the stream data information section (FIG. 3) by generation, and supplies it to the multiplexer 108 as section data.

  The video data acquisition unit 102 acquires video data of a one-segment service from a built-in HDD (Hard Disk Drive), an external server, a camera, and the like, and supplies the video data to the video encoder 103. Further, when sending AV streaming data of the one-segment additional information service, the video data acquisition unit 102 acquires the video data from an external server, camera, or the like and supplies the video data to the video encoder 103.

  The video encoder 103 encodes the video data supplied from the video data acquisition unit 102 in accordance with an encoding method such as MPEG, and supplies the encoded data to the multiplexer 108.

  The audio data acquisition unit 104 acquires audio data of the one seg service from a built-in HDD, an external server, a microphone, or the like, and supplies it to the audio encoder 105. Also, the audio data acquisition unit 104 acquires the audio data from an external server, microphone, or the like when supplying AV streaming data of the one-segment additional information service, and supplies the audio data to the audio encoder 105.

  The audio encoder 105 encodes the audio data supplied from the audio data acquisition unit 104 in accordance with an encoding method such as MPEG, and supplies the encoded data to the multiplexer 108.

  When sending the file format data of the one-segment additional information service, the file data acquisition unit 106 receives the file format data such as video, audio, binary, text, application, etc. from the built-in HDD or an external server. Obtained and supplied to the file processing unit 107.

  The file processing unit 107 converts the data in the file format supplied from the file data acquisition unit 106 into, for example, IP format data according to IP over MPEG2-TS, and supplies the data to the multiplexer 108.

  The multiplexer 108 multiplexes various data from the control signal acquisition unit 101, video data from the video encoder 103, audio data from the audio encoder 105, and IP format data from the file processing unit 107 to generate a TS. Then, the data is supplied to the transmission unit 109.

  The transmission unit 109 transmits the TS supplied from the multiplexer 108 via the antenna 110 in a predetermined segment.

  However, AV streaming data of the 1Seg service is transmitted in one segment (A layer) together with PSI / SI, etc., and AV streaming data of the 1Seg additional information service and IP format data, that is, additional information such as content The data is transmitted in, for example, 12 segments (B layer) or 13 segments. Further, the data of the stream data information section is transmitted in, for example, 12 segments (B layer) or 13 segments.

(Configuration example of receiving device)
FIG. 17 is a block diagram illustrating a detailed configuration example of the reception device 20 of FIG.

  In FIG. 17, the receiving device 20 includes an antenna 201, a tuner 202, a demultiplexer 203, a video decoder 204, a display 205, an audio decoder 206, a speaker 207, a file processing unit 208, a storage 209, a control unit 210, an operation unit 211, and The communication unit 212 is configured.

  The antenna 201 receives a UHF band broadcast wave from the transmission device 10 and supplies a broadcast signal obtained by receiving the broadcast wave to the tuner 202.

  The tuner 202 selects (demodulates) an area broadcast (signal) of a predetermined logical channel from the broadcast signal from the antenna 201 in accordance with control from the control unit 210, and sends the TS obtained as a result to the demultiplexer 203. Supply.

  The demultiplexer 203 separates the TS supplied from the tuner 202 into various data such as PSI / SI, video data, audio data, IP format data, and the like according to control from the control unit 210. The demultiplexer 203 supplies various data such as PSI / SI to the control unit 210, supplies video data to the video decoder 204, supplies audio data to the audio decoder 206, and receives IP data according to control from the control unit 210. The format data is supplied to the file processing unit 208.

  The video decoder 204 decodes the video data supplied from the demultiplexer 203 in a method corresponding to the video encoder 103 (FIG. 16) under the control of the control unit 210, and the video data obtained thereby is displayed on the display 205. Supply. The display 205 displays video corresponding to the video data supplied from the video decoder 204. The display 205 can display an image corresponding to video data of an image such as OSD (On Screen Display) in accordance with control from the control unit 210.

  The audio decoder 206 decodes the audio data supplied from the demultiplexer 203 in a manner corresponding to the audio encoder 105 (FIG. 16) under the control of the control unit 210, and the audio data obtained thereby is sent to the speaker 207. Supply. The speaker 207 outputs sound corresponding to the audio data from the audio decoder 206.

  The file processing unit 208 processes the data in the IP format supplied from the demultiplexer 203 according to the control from the control unit 210 in a method corresponding to the file processing unit 107 (FIG. 16), and the file format obtained thereby Is supplied to at least one of the display 205 and the speaker 207.

  For example, when data such as a video file, a still image file, a text file, and an application is acquired as data in the file format, the data in the file format is supplied to the display 205, and a corresponding video or image is displayed. Is done. When data such as an audio file is acquired as the file format data, the data in the file format is supplied to the speaker 207 and the corresponding audio is output.

  Further, the demultiplexer 203 supplies video data, audio data, or IP format data to the storage 209 in accordance with control from the control unit 210. The storage 209 is a large-capacity recording medium such as an HDD. The storage 209 accumulates video data, audio data, or IP format data from the demultiplexer 203 in accordance with control from the control unit 210. Thereby, for example, it is possible to store content transmitted as additional information.

  The storage 209 supplies the accumulated video data to the video decoder 204, supplies the accumulated audio data to the audio decoder 206, and stores the accumulated IP format data as the file processing unit 208 in accordance with the control from the control unit 210. To supply. Then, in the video decoder 204, the audio decoder 206, and the file processing unit 208, the above-described decoding processing and file processing are performed, and the stored content is reproduced.

  The control unit 210 controls each unit constituting the receiving device 20. The operation unit 211 is operated by the user and supplies an operation signal corresponding to the operation to the control unit 210. Note that the operation unit 211 includes buttons displayed as a GUI (Graphics User Interface) on the display 205 in addition to physical buttons and the like. The control unit 210 controls the operation of each unit constituting the receiving device 20 in accordance with an operation signal from the operation unit 211.

  The communication unit 212 exchanges information with various servers such as the additional information providing server 30 connected to the Internet 90 according to control from the control unit 210. The control unit 210 controls the operation of each unit constituting the receiving device 20 in accordance with various data received by the communication unit 212.

(Functional configuration example of control unit)
FIG. 18 is a block diagram illustrating an example of a functional configuration of a portion that performs predetermined processing related to additional information in the control unit 210 of FIG.

  In FIG. 18, the control unit 210 includes a control signal acquisition analysis unit 251, an accumulation control unit 252, and a reproduction control unit 253.

  Based on the PID of the section data specified in the additional service info in the area broadcast information descriptor included in the PSI / SI (NIT) separated by the demultiplexer 203, the control signal acquisition analysis unit 251 performs the stream data information section. Get the data.

  The control signal acquisition analysis unit 251 analyzes one or a plurality of content information descriptors described in the stream data information section, and supplies the analysis result to the accumulation control unit 252 and the reproduction control unit 253. The control signal acquisition / analysis unit 251 analyzes one or more application information descriptors described in the stream data information section, and supplies the analysis result to the accumulation control unit 252 and the reproduction control unit 253.

  The accumulation control unit 252 is configured so that the additional information data separated by the demultiplexer 203 is accumulated in the storage 209 according to the analysis result supplied from the control signal acquisition analysis unit 251. To control the operation. For example, the accumulation control unit 252 controls the demultiplexer 203, the storage 209, and the like so that the content data in the IP format supplied from the demultiplexer 203 is accumulated in the storage 209.

  When the reproduction control unit 253 is instructed to reproduce the accumulated content, the reproduction control unit 253 reproduces the additional information data accumulated in the storage 209 in accordance with the analysis result supplied from the control signal acquisition analysis unit 251. The operation of each unit constituting the receiving device 20 is controlled. For example, the playback control unit 253 controls the file processing unit 208, the storage 209, and the like so that IP-format content data stored in the storage 209 is played back.

  As described above, the accumulation control unit 252 and the reproduction control unit 253 perform each process of performing predetermined processing regarding additional information (for example, content) according to the result of analysis of meta information regarding additional information (for example, content) by the control signal acquisition analysis unit 251. Is controlling the operation.

  The control unit 210 is configured as described above.

<4. Flow of specific processing performed by each device>

  Next, with reference to the flowcharts of FIGS. 19 to 27, the flow of specific processing performed by each device constituting the area broadcasting system 1 of FIG. 15 will be described.

(Transmission process)
First, the transmission process executed by the transmission apparatus 10 in FIG. 15 will be described with reference to the flowchart in FIG.

  In step S <b> 101, the control signal acquisition unit 101 acquires a control signal such as PSI / SI by generating section data such as a stream data information section and supplies it to the multiplexer 108. However, PSI / SI includes PMT and NIT. The NIT includes an area broadcast information descriptor. The additional service info arranged in the area broadcast information descriptor describes the PID of the stream data information section. The stream data information section includes meta information for each additional information descriptor.

  In step S <b> 102, the video data acquisition unit 102 acquires video data of the one-segment service or the one-segment additional information service and supplies the video data to the video encoder 103. In step S 103, the video encoder 103 encodes the video data supplied from the video data acquisition unit 102 and supplies the encoded video data to the multiplexer 108.

  In step S <b> 104, the audio data acquisition unit 104 acquires audio data of the one-segment service or the one-segment additional information service and supplies the audio data to the audio encoder 105. In step S <b> 105, the audio encoder 105 encodes the audio data supplied from the audio data acquisition unit 104 and supplies the encoded audio data to the multiplexer 108.

  In step S <b> 106, the file data acquisition unit 106 acquires file format data of the one-segment additional information service and supplies the data to the file processing unit 107. In step S <b> 107, the file processing unit 107 converts the data in the file format supplied from the file data acquisition unit 106 into data in a predetermined format and supplies the data to the multiplexer 108.

  In step S <b> 108, the multiplexer 108 multiplexes various data from the control signal acquisition unit 101, video data from the video encoder 103, audio data from the audio encoder 105, and IP format data from the file processing unit 107. To generate TS.

  In step S109, the transmission unit 109 transmits the TS supplied from the multiplexer 108 through a predetermined segment to transmit the TS via the antenna 110, and ends the transmission process.

  This is the end of the description of the transmission process.

(First reception / storage process)
Next, the first reception / accumulation process executed by the reception device 20 of FIG. 15 will be described with reference to the flowchart of FIG.

  In step S201, the control unit 210 controls the tuner 202 to activate the tuner 202 and perform channel selection processing. In step S202, the control signal acquisition analysis unit 251 acquires the PSI / SI (A hierarchy) separated by the demultiplexer 203. In addition, the control signal acquisition analysis unit 251 performs PSI / SI analysis.

  In step S203, the control signal acquisition analysis unit 251 determines whether the NIT included in the PSI / SI has an area broadcast information descriptor. If it is determined in step S203 that the NIT does not have an area broadcast information descriptor, the process proceeds to step S204. In this case, the receiving device 20 displays a normal one-seg broadcast program (S204). Note that when the process of step S204 ends, the first reception / storage process ends.

  If it is determined in step S203 that the NIT has an area broadcast information descriptor, the process proceeds to step S205. In step S205, the control signal acquisition analysis unit 251 determines whether there is additional service info in the area broadcast information descriptor. If it is determined in step S205 that there is no additional service info in the area broadcast information descriptor, the process proceeds to step S206. In this case, the receiving device 20 displays a normal area broadcast program, that is, a one-seg service program (S206). Note that when the process of step S206 ends, the first reception / storage process ends.

  If it is determined in step S205 that there is additional service info in the area broadcast information descriptor, the process proceeds to step S207. In step S207, the control signal acquisition analysis unit 251 acquires the PID of the section data specified in the additional service info in the area broadcast information descriptor. In step S206, the control signal acquisition analysis unit 251 acquires section data (stream data information section data) specified by the PID of the section data acquired in the process of step S207 from the data of the B layer.

  In step S209, the control signal acquisition analysis unit 251 acquires the first content information descriptor from the content information descriptor described in the stream data information section. Then, the control signal acquisition / analysis unit 251 acquires the content ID (content id), the content version (content version), and the content name (content title) described in the content information descriptor acquired in the process of step S209. (S210, S211).

  In step S212, the accumulation control unit 252 causes the display 205 to display the name of the content acquired by the control signal acquisition analysis unit 251 in the process of step S211.

  In step S213, the control signal acquisition analysis unit 251 determines whether the next content information descriptor exists in the stream data information section. If it is determined in step S213 that the next content information descriptor exists, the process proceeds to step S214. In step S214, the control signal acquisition analysis unit 251 acquires the next content information descriptor from the content information descriptor described in the stream data information section. When the process of step S214 ends, the process returns to step S210, and the processes of steps S210 to S214 described above are repeated.

  That is, for example, as shown in FIG. 2, when there are three content information descriptors in the stream data information section, the processing of steps S210 to S214 is repeated for each content information descriptor. The content ID, version, and name are acquired. As a result, the names of the contents 1 to 3 are displayed on the display 205. If the process for the last content information descriptor is completed and it is determined in step S213 that the next content information descriptor does not exist, the process proceeds to step S215.

  In step S <b> 215, the control unit 210 determines whether a predetermined operation for instructing the start of content storage has been performed based on the operation signal from the operation unit 211. The user can confirm the name of the content (for example, the names of the contents 1 to 3 in FIG. 2) displayed on the display 205 by the process of step S212 before performing the operation. Only when the name is displayed, the start of content storage is instructed.

  As described above, when the content is stored by transmitting the stream data information section including the meta information regarding the content in a dedicated independent section, the content is presented to the user before starting the storage. Therefore, the user can select content to be accumulated.

  In step S215, after waiting for a predetermined operation by the user, the process proceeds to step S216. In step S216, the accumulation control unit 252 acquires the PID corresponding to the content to be stored described in the content information descriptor according to the analysis result by the control signal acquisition analysis unit 251.

  In step S216, the accumulation control unit 252 starts accumulating ES transmitted in the B layer based on the PID acquired in the process of step S216. As a result, the ESs of the contents for which the start of storage is instructed are sequentially stored in the storage 209. In step S218, it is determined whether or not the accumulation of number of components ES described in the content information descriptor has been completed. In step S218, the process proceeds to step S219 after it is determined that the accumulation of number of components ESs has been completed.

  In step S219, the accumulation control unit 252 records the content ID (content id) and version (content version) of the content that has been acquired and acquired in step S210 in the content list. As a result, as shown in FIG. 21, the content list stores the content ID of the content that has been accumulated and its version in association with each other. The content list is stored in the storage 209 or the like.

  Returning to the flowchart of FIG. 20, when the recording process in step S219 ends, the process proceeds to step S220. In step S220, content accumulation by the accumulation control unit 252 is terminated, and the first reception / accumulation process is terminated.

  For example, when the stream data information section of FIG. 2 is acquired, when the start of accumulation of the content 3 is instructed from the contents 1 to 3 that can be accumulated in step S215, the stream information information section is based on the content information descriptor 3. Thus, ES with PID = “0x801” (ULE) is extracted from the data of the B layer and accumulated in the storage 209. At this time, the content list of FIG. 21 stores the content ID of content 3 and its version in association with each other.

  This is the end of the description of the first reception / storage process.

(Second reception / storage process)
Next, the second reception / accumulation process executed by the reception device 20 of FIG. 15 will be described with reference to the flowchart of FIG. Note that the second reception / storage process is a content reception / storage process when there is linked content executed in conjunction with the content.

  In steps S251 to S256, as in steps S201 to S206 of FIG. 20, when it is determined that the NIT does not have an area broadcast information descriptor, the receiving device 20 displays a normal one-seg broadcast program ( S254). If it is determined that there is no additional service info in the area broadcast information descriptor, the receiving device 20 displays a normal area broadcast program, that is, a one-segment service program (S256). On the other hand, if it is determined that there is additional service info in the area broadcast information descriptor, the processing after step S257 is executed, and processing related to the one-segment additional information service is performed.

  In steps S257 to S264, as in steps S207 to S214 of FIG. 20, a stream data information section is acquired, and for each content information descriptor described in the stream data information section, a content ID, a content version, and The name of the content is acquired. In the process of step S260, a linked content ID (content ad id) is further acquired.

  In steps S265 to S270, as in steps S215 to S220 of FIG. 20, when a predetermined operation is performed, ES is selected from the data of the B layer based on the content information descriptor of the content to be accumulated. Extracted and accumulated in the storage 209. When the accumulation of the content to be accumulated is completed, as shown in FIG. 23, the content list includes the content ID (content id = "1234") and the version (content version = "01234") of the content that has been accumulated. In conjunction with “), a linked content ID (content ad id =“ 7770 ”) is stored in association with each other.

  This is the end of the description of the second reception / storage process.

(Reproduction processing)
Next, with reference to the flowchart of FIG. 24, the reproduction process executed by the reception device 20 of FIG. 15 will be described. Note that when executing this reproduction process, the first reception / storage process of FIG. 20 or the second reception / storage process of FIG. 22 has been executed, and the storage 209 stores content. It is assumed that it has been accumulated.

  In step S <b> 301, the control unit 210 determines whether a predetermined operation for instructing content reproduction has been performed based on an operation signal from the operation unit 211. Note that, for example, the reproduction control unit 253 displays a list of names of reproducible contents on the display 205 according to the analysis result by the control signal acquisition analysis unit 251, so that the user can select a desired content from the list. Content can be selected.

  In step S301, after waiting for a predetermined operation by the user, the process proceeds to step S302. In step S302, the playback control unit 253 confirms the content list. In step S303, the playback control unit 253 determines whether or not a linked content ID (content ad id) is associated with the content instructed to be played based on the confirmation result obtained in the process of step S302. .

  If it is determined in step S303 that the linked content ID is associated, the process proceeds to step S304. In step S304, the reproduction control unit 253 controls the operation of each unit to reproduce, for example, linked content such as a CM video or lyrics.

  The linked content may be acquired in advance and stored in the storage 209, or may be acquired via broadcast waves or communication at the timing of this reproduction. For example, when linked content data is stored in the storage 209, the playback control unit 253 causes the stored data to be supplied to the file processing unit 208 and the like so that the linked content can be played back. Done.

  When playback of linked content is started in step S304, the process proceeds to step S305. In step S305, the reproduction control unit 253 controls the operation of each unit to reproduce the content instructed to be reproduced. For example, the reproduction control unit 253 reproduces the accumulated content by supplying the data in the IP format accumulated in the storage 209 to the file processing unit 208.

  As described above, when the linked content ID is associated with the content instructed to be reproduced, the linked content is also reproduced in conjunction with the content instructed to be reproduced. In addition, although it is the display timing of a content and an interlocking content, those content may be displayed simultaneously and each content may be displayed sequentially. As a display method, overlay display, parallel window display, or the like can be employed. However, the display timings and display methods listed here are merely examples, and any display form can be adopted as the display form of the content and the linked content.

  On the other hand, if it is determined in step S303 that the linked content ID is not associated, the process of step S304 is skipped, and the process proceeds to step S305. In step S305, the reproduction control unit 253 controls the operation of each unit to reproduce the content instructed to be reproduced. In this case, the linked content is not reproduced, and only the content instructed to be reproduced is reproduced.

  For example, when the content list of FIG. 23 is confirmed in the process of step S302 and the content ID (content id) of the content instructed to be reproduced is “1234”, the linked content ID (content ad id) is “7770”. Since there is a linked content that becomes "," this linked content (content ad id = "7770") is played back in conjunction with the content (content id = "1234"). Also, for example, when the content list in FIG. 23 is confirmed and the content ID (content id) of the content instructed to be reproduced is “1235”, the linked content ID is not associated, so the content (content id = "1235") only will be played.

  This is the end of the description of the playback process.

(Third reception / storage processing)
Next, with reference to the flowcharts of FIGS. 25 and 26, the third reception / storage process executed by the reception device 20 of FIG. 15 will be described. Note that the third reception / storage process is a content reception / storage process in the case of performing differential transmission of content.

  In Steps S401 to S406, as in Steps S201 to S206 of FIG. 20, when it is determined that the NIT does not have an area broadcast information descriptor, the reception device 20 displays a normal one-seg broadcast program ( S404). If it is determined that there is no additional service info in the area broadcast information descriptor, the receiving device 20 displays a normal area broadcast program, that is, a one-segment service program (S406). On the other hand, if it is determined that there is additional service info in the area broadcast information descriptor, the processing after step S407 is executed, and processing relating to the one-segment additional information service is performed.

  In steps S407 to S416, as in steps S207 to S214 of FIG. 20, a stream data information section is acquired, and for each content information descriptor described in the stream data information section, the content ID and version of the content are set. In FIG. 25, the processing of steps S411 to S412 is further added, and processing related to differential transmission of content is performed. That is, the control signal acquisition analysis unit 251 performs differential transmission determination processing (S411), and determines whether there is differential transmission of the content to be stored (S412).

  If it is determined in step S412 that there is differential transmission, the process proceeds to step S413. Thereby, the content name (content title) described in the content information descriptor is acquired and displayed. On the other hand, if it is determined in step S412 that there is no differential transmission, the processes in steps S413 to S414 are skipped, and the process proceeds to step S415. That is, the display of the name of the content that is not the target of differential transmission is skipped, and only the name of the content that is the target of differential transmission is displayed. The details of the differential transmission determination process will be described later with reference to the flowchart of FIG.

  In steps S417 to S429, as in steps S215 to S220 of FIG. 20, when a predetermined operation is performed, ES is selected from the data of the B layer based on the content information descriptor of the content to be accumulated. Although it is extracted and stored in the storage 209, the contents of the processing differ depending on whether there is differential transmission of the content to be stored.

  Specifically, if it is determined in step S417 that a predetermined operation for instructing the start of content storage has been performed, the process proceeds to step S418. Then, the control signal acquisition analysis unit 251 performs differential transmission determination processing (S418), and determines whether there is differential transmission of the content to be stored (S419). The details of the differential transmission determination process will be described later with reference to the flowchart of FIG.

  If it is determined in step S419 that there is differential transmission, the process proceeds to step S420. In step S420, the accumulation control unit 252 acquires a PID corresponding to the content to be stored described in the content information descriptor according to the result of analysis by the control signal acquisition analysis unit 251.

  In step S421, the accumulation control unit 252 starts accumulation of ES difference data transmitted in the B layer based on the PID acquired in the process of step S420, and starts the accumulation of the content instructed to start accumulation. Differential data is accumulated sequentially. In step S422, it is determined whether or not the difference accumulation of number of components ES described in the content information descriptor is completed, and after waiting for the difference accumulation of ES to be completed, the process proceeds to step S423. Proceed to

  For example, when “01” is specified as the difference transmission flag (diff flag), it is an overwrite (Overwrite). Therefore, as described in the example of difference accumulation in FIG. Thus, the differential data is overwritten. Further, for example, when “10” is designated as the differential transmission flag (diff flag), the replacement is performed. Therefore, as described in the example of the differential accumulation in FIG. On the other hand, the difference data is replaced.

  In step S423, the accumulation control unit 252 records the version (content version) of the content that has been subjected to differential accumulation, acquired in the process of step S410, in the content list, and updates the version of the content. That is, in the case of differential transmission of content, since only partial differential data of the content is updated, only the version is updated without registering the content ID. In step S424, the content difference accumulation is terminated.

  On the other hand, if it is determined in step S419 that there is no differential transmission, the process proceeds to step S425. In step S425, the accumulation control unit 252 acquires a PID corresponding to the content to be stored described in the content information descriptor according to the analysis result by the control signal acquisition analysis unit 251.

  In step S426, the accumulation control unit 252 starts accumulation of ES data transmitted in the B layer based on the PID acquired in the process of step S425, and the content data instructed to start accumulation. Are sequentially accumulated. In step S427, it is determined whether or not the accumulation of number of components ES described in the content information descriptor has been completed. After the accumulation of ES is completed, the process proceeds to step S428. Be

  In step S428, the storage control unit 252 records the content ID (content id) and the version (content version) of the content that has been acquired and acquired in step S410 in the content list, and newly adds the content. Register. That is, in the case of non-differential transmission of content, since all data of the content is sent, the content ID and version of the content are newly registered. If there is linked content that is executed in conjunction with the content to be stored, the linked content ID is acquired in the process of step S410, and the content ID of the content that has been stored in step S428 and its content Along with the version, the linked content ID will also be registered. Then, in step S429, content accumulation is terminated.

  When the process of step S424 or step S429 ends, the third reception / storage process ends.

  This is the end of the description of the third reception / storage process.

(Differential transmission determination processing)
Finally, with reference to the flowchart of FIG. 27, the details of the differential transmission determination process corresponding to the process of step S411 of FIG. 25 and the process of step S418 of FIG.

  In step S451, the control signal acquisition analysis unit 251 acquires a differential transmission flag (diff flag) described in the content information descriptor. Note that the content version (content version) may be acquired at this timing without being acquired in the process of step S410 in FIG.

  In step S452, the control signal acquisition / analysis unit 251 determines whether diff flag = "01" or diff flag = "10" based on the differential transmission flag acquired in the process of step S451. If it is determined in step S452 that diff flag = "01" or diff flag = "10", that is, overwrite (Overwrite) or replace (Replace), the process proceeds to step S453. .

  In step S453, the control signal acquisition analysis unit 251 confirms the content list. In step S454, the control signal acquisition analysis unit 251 has the same content ID (content id) acquired in the process of step S410 of FIG. 25 in the content list based on the confirmation result obtained in the process of step S453. It is determined whether there is content that has a content ID and an older version of the content (content version).

  If it is determined in step S454 that there is content with the same content ID and an old version in the content list, the process proceeds to step S455. In step S455, the control signal acquisition / analysis unit 251 determines that the content to be stored is “with differential transmission”.

  On the other hand, if it is determined in step S452 that diff flag = "01" or diff flag = "10", that is, diff flag = "00", the difference transmission of the content is not performed. The process proceeds to step S456. If it is determined in step S454 that there is no identical content ID in the content list, or if it is determined that there is no content with an older version even if there is the same content ID, the process proceeds to step S456. It is advanced. In step S456, the control signal acquisition analysis unit 251 determines that the content to be stored is “no differential transmission”.

  When the process of step S455 or step S456 ends, the process returns to the process of step S411 of FIG. 25 or the process of step S418 of FIG. 26, and the subsequent processes are executed.

  This is the end of the description of the differential transmission determination process.

<5. Computer configuration>

  The series of processes described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software is installed in the computer. Here, the computer includes, for example, a general-purpose personal computer capable of executing various functions by installing a computer incorporated in dedicated hardware and various programs.

  FIG. 28 is a block diagram illustrating a configuration example of hardware of a computer that executes the above-described series of processing by a program.

  In the computer 900, a CPU (Central Processing Unit) 901, a ROM (Read Only Memory) 902, and a RAM (Random Access Memory) 903 are connected to each other by a bus 904. An input / output interface 905 is further connected to the bus 904. An input unit 906, an output unit 907, a recording unit 908, a communication unit 909, and a drive 910 are connected to the input / output interface 905.

  The input unit 906 includes a keyboard, a mouse, a microphone, and the like. The output unit 907 includes a display, a speaker, and the like. The recording unit 908 includes a hard disk, a nonvolatile memory, and the like. The communication unit 909 includes a network interface or the like. The drive 910 drives a removable medium 911 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

  In the computer 900 configured as described above, the CPU 901 loads the program stored in the recording unit 908 to the RAM 903 via the input / output interface 905 and the bus 904 and executes the program, for example. A series of processing is performed.

  A program executed by the computer 900 (CPU 901) can be provided by being recorded on a removable medium 911 as a package medium, for example. The program can be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  In the computer 900, the program can be installed in the recording unit 908 via the input / output interface 905 by attaching the removable medium 911 to the drive 910. Further, the program can be received by the communication unit 909 via a wired or wireless transmission medium and installed in the recording unit 908. In addition, the program can be installed in the ROM 902 or the recording unit 908 in advance.

  Note that the program executed by the computer 900 may be a program that is processed in time series in the order described in this specification, or a necessary timing such as when a call is made in parallel. It may be a program in which processing is performed.

  Here, in the present specification, the processing steps for describing a program for causing the computer 900 to perform various processes do not necessarily have to be processed in time series in the order described in the flowchart, and may be performed in parallel or individually. (For example, parallel processing or object processing).

  Further, the program may be processed by one computer, or may be distributedly processed by a plurality of computers. Furthermore, the program may be transferred to a remote computer and executed.

  Furthermore, in this specification, the system means a set of a plurality of components (devices, modules (parts), etc.), and it does not matter whether all the components are in the same housing. Accordingly, a plurality of devices housed in separate housings and connected via a network and a single device housing a plurality of modules in one housing are all systems. .

  The embodiments of the present technology are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present technology. For example, the present technology can take a configuration of cloud computing in which one function is shared by a plurality of devices via a network and jointly processed.

  In addition, each step described in the above flowchart can be executed by being shared by a plurality of apparatuses in addition to being executed by one apparatus. Further, when a plurality of processes are included in one step, the plurality of processes included in the one step can be executed by being shared by a plurality of apparatuses in addition to being executed by one apparatus.

  In addition, this technique can take the following structures.

(1)
A transmission unit that transmits broadcast waves of an area broadcast that is broadcast by an arbitrary segment;
A first acquisition unit for acquiring additional information used in the area broadcasting service;
A second acquisition unit that acquires an information descriptor including meta information related to the additional information,
The transmission unit transmits the information descriptor together with the additional information by a broadcast wave of the area broadcast.
(2)
The transmission device according to (1), wherein the information descriptor is transmitted in a dedicated independent section.
(3)
The additional information is one or more contents,
The transmission apparatus according to (2), wherein the meta information includes information indicating an ID, a type, and a version of the content.
(4)
The transmission apparatus according to (3), wherein the meta information further includes information indicating a differential transmission flag indicating whether or not the data of the updated part of the stored content is differentially transmitted.
(5)
The transmission apparatus according to (3) or (4), wherein the meta information further includes information indicating an ID of linked content executed in conjunction with the content.
(6)
The transmission apparatus according to any one of (3) to (5), wherein the meta information further includes information indicating a name of the content.
(7)
The additional information is one or more applications,
The transmission apparatus according to (2) or (3), wherein the meta information includes information indicating an ID of the application.
(8)
The broadcast wave is
The frequency band is divided into 13 segments,
One segment broadcast is performed by arbitrary one segment among the 13 segments, and the additional information is transmitted by all segments or segments of an arbitrary layer. (2) to (7) Transmitter device.
(9)
The section is specified by an identifier that can identify the section, which is arranged in the area broadcasting descriptor included in the NIT (Network Information Table) defined by a predetermined standard. (2) to (8 The transmission device according to any one of the above.
(10)
In the transmission method of the transmission device,
The transmitting device is
Send broadcast waves of area broadcasts that are broadcast by any segment,
Acquire additional information used in the area broadcasting service,
Obtaining an information descriptor including meta-information on the additional information;
A transmission method including a step of transmitting the information descriptor together with the additional information by a broadcast wave of the area broadcast.
(11)
In a broadcast area capable of receiving a broadcast wave transmitted from a transmitter that performs area broadcast that is broadcast by an arbitrary segment, a receiving unit that receives the broadcast wave;
A control unit that controls the operation of each unit that performs predetermined processing related to the additional information, based on meta information related to the additional information used in the area broadcasting service included in the information descriptor obtained from the broadcast wave. Receiver device.
(12)
The receiving device according to (11), wherein the information descriptor is transmitted in a dedicated independent section.
(13)
The additional information is one or more contents,
The receiving apparatus according to (12), wherein the meta information includes information indicating an ID, a type, and a version of the content.
(14)
The meta information further includes information indicating a differential transmission flag indicating whether or not to differentially transmit the data of the updated part of the stored content,
The receiving device according to (13), wherein the control unit updates a partial data of the accumulated content based on the meta information.
(15)
The meta information further includes information indicating an ID of linked content executed in conjunction with the content,
The receiving device according to (13) or (14), wherein the control unit controls the operation of the linked content based on the meta information.
(16)
The meta information further includes information indicating a name of the content,
The receiving unit according to any one of (13) to (15), wherein the control unit displays a name of the content based on the meta information.
(17)
The additional information is one or more applications,
The receiving apparatus according to (12) or (13), wherein the meta information includes information indicating an ID of the application.
(18)
The broadcast wave is
The frequency band is divided into 13 segments,
One segment broadcast is performed by arbitrary one segment among the 13 segments, and the additional information is transmitted by all segments or segments of an arbitrary layer. (12) to (17) Receiver device.
(19)
The section is specified by an identifier capable of identifying the section, which is arranged in the area broadcast descriptor included in the NIT defined by a predetermined standard. (12) to (18) The receiving device according to item.
(20)
In the receiving method of the receiving device,
The receiving device is
In a broadcast area capable of receiving a broadcast wave transmitted from a transmitter that performs an area broadcast that is a broadcast by an arbitrary segment, the broadcast wave is received,
A receiving method including a step of controlling the operation of each unit that performs a predetermined process relating to the additional information, based on meta information relating to the additional information used in the area broadcasting service included in the information descriptor obtained from the broadcast wave .

  1 area broadcasting system, 10 transmitting device, 20 receiving device, 30 additional information providing server, 90 Internet, 101 control signal acquiring unit, 102 video data acquiring unit, 104 audio data acquiring unit, 106 file data acquiring unit, 109 transmitting unit, 202 tuner, 204 video decoder, 206 audio decoder, 208 file processing unit, 209 storage, 210 control unit, 251 control signal acquisition analysis unit, 252 accumulation control unit, 253 playback control unit, 900 computer, 901 CPU

Claims (20)

A transmission unit that transmits broadcast waves of an area broadcast that is broadcast by an arbitrary segment;
A first acquisition unit for acquiring additional information used in the area broadcasting service;
A second acquisition unit that acquires an information descriptor including meta information related to the additional information,
The transmission unit transmits the information descriptor together with the additional information by a broadcast wave of the area broadcast. The transmission device according to claim 1, wherein the information descriptor is transmitted in a dedicated independent section. The additional information is one or more contents,
The transmission apparatus according to claim 2, wherein the meta information includes information indicating an ID, a type, and a version of the content. The transmission apparatus according to claim 3, wherein the meta information further includes information indicating a differential transmission flag indicating whether or not the data of the updated part of the stored content is differentially transmitted. The transmission apparatus according to claim 3, wherein the meta information further includes information indicating an ID of linked content executed in conjunction with the content. The transmission apparatus according to claim 3, wherein the meta information further includes information indicating a name of the content. The additional information is one or more applications,
The transmission apparatus according to claim 2, wherein the meta information includes information indicating an ID of the application. The broadcast wave is
The frequency band is divided into 13 segments,
The transmission apparatus according to claim 2, wherein one-segment broadcasting is performed in any one segment among the 13 segments, and the additional information is transmitted in all segments or segments in any hierarchy. The section is specified by an identifier capable of identifying the section, which is arranged in the area broadcasting descriptor included in a network information table (NIT) defined by a predetermined standard. Transmitter device. In the transmission method of the transmission device,
The transmitting device is
Send broadcast waves of area broadcasts that are broadcast by any segment,
Acquire additional information used in the area broadcasting service,
Obtaining an information descriptor including meta-information on the additional information;
A transmission method including a step of transmitting the information descriptor together with the additional information by a broadcast wave of the area broadcast. In a broadcast area capable of receiving a broadcast wave transmitted from a transmitter that performs area broadcast that is broadcast by an arbitrary segment, a receiving unit that receives the broadcast wave;
A control unit that controls the operation of each unit that performs predetermined processing related to the additional information, based on meta information related to the additional information used in the area broadcasting service included in the information descriptor obtained from the broadcast wave. Receiver device. The receiving apparatus according to claim 11, wherein the information descriptor is transmitted in a dedicated independent section. The additional information is one or more contents,
The receiving apparatus according to claim 12, wherein the meta information includes information indicating an ID, a type, and a version of the content. The meta information further includes information indicating a differential transmission flag indicating whether or not to differentially transmit the data of the updated part of the stored content,
The receiving device according to claim 13, wherein the control unit updates a partial data of the accumulated content based on the meta information. The meta information further includes information indicating an ID of linked content executed in conjunction with the content,
The receiving device according to claim 13, wherein the control unit controls the operation of the linked content based on the meta information. The meta information further includes information indicating a name of the content,
The receiving device according to claim 13, wherein the control unit displays the name of the content based on the meta information. The additional information is one or more applications,
The receiving device according to claim 12, wherein the meta information includes information indicating an ID of the application. The broadcast wave is
The frequency band is divided into 13 segments,
The receiving apparatus according to claim 12, wherein one-segment broadcasting is performed in any one segment among the 13 segments, and the additional information is transmitted in all segments or segments in any layer. The receiving apparatus according to claim 12, wherein the section is specified by an identifier that can be used to identify the section, which is arranged in the area broadcast descriptor included in the NIT defined by a predetermined standard. In the receiving method of the receiving device,
The receiving device is
In a broadcast area capable of receiving a broadcast wave transmitted from a transmitter that performs an area broadcast that is a broadcast by an arbitrary segment, the broadcast wave is received,
A receiving method including a step of controlling the operation of each unit that performs a predetermined process relating to the additional information, based on meta information relating to the additional information used in the area broadcasting service included in the information descriptor obtained from the broadcast wave .

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