KR101672287B1 - method of receiving a broadcasting signal and apparatus for receiving a broadcasting signal - Google Patents

Abstract

The present invention relates to a broadcast signal receiving method and a broadcast signal receiving apparatus. According to an embodiment of the present invention, an embodiment of the present invention is a broadcast signal receiving method of a broadcast receiving apparatus, comprising: a first encoding step of encoding a first encoded data and a second encoded data, Receiving encoded data description information in non-real time, receiving a file including the first encoded data in non-real time according to the first encoded data description information, And decoding the first encoded data received in the non-real time and the second encoded data received in real time together to present the content.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a broadcast signal receiving method and a broadcast signal receiving apparatus,

The present invention relates to a broadcast signal receiving method and a broadcast signal receiving apparatus.

Digital television (DTV) has been able to provide a variety of services in addition to providing video and audio, which are unique functions of television (TV). For example, an electronic program guide (EPG) or the like can be provided to a user, and the content can be provided as a real-time or non-real-time transmission channel. Particularly, a broadcasting signal receiving apparatus is provided with a large-capacity storage device or a service that can be provided using a broadcast signal while being connected to the Internet or a data communication channel capable of two-way communication.

In such an environment, a broadcasting signal transmitting / receiving method for providing a real time broadcasting service and a non-real time broadcasting service and a broadcasting signal receiving device capable of realizing the same are being developed.

Meanwhile, scalable video / audio coding method is expected to be adopted as a next-generation broadcasting video codec for high-definition / high-efficiency video / audio viewing and recording, and thus various functions using the scalable video / audio coding scheme are expected to be introduced. Conventionally, the restriction and authority for viewing and recording high-definition video data have not been considered in isolation. Currently, real-time terrestrial broadcasting is free-to-air and viewing of high-quality / high-impact video / audio data is not a problem if the receiver is capable of receiving high-quality / high-performance video / audio data. However, video / audio data recording of high quality / high effect may cause various problems. For example, conventionally, when recording high-quality video, the quality of the image is down-graded, which requires additional equipment such as a transcoder. Data of scalable video coding scheme can be transmitted separately for each video layer (base layer, enhancement layer). Especially, for high-definition video (for example, enhancement layer) There is a technical problem to be solved.

It is an object of the present invention to provide a broadcast signal receiving method and a broadcast signal receiving apparatus capable of efficiently providing a broadcast service transmitted in real time and a non-real time broadcast service.

It is an object of the present invention to provide a broadcast signal receiving method and a broadcast signal receiving apparatus capable of recording and displaying only high-quality content coded by a coding scheme such as SVC (scalable video coding) or MVC (multiview video coding) .

According to an embodiment of the present invention, there is provided a broadcast signal receiving method of a broadcast receiving apparatus, comprising the steps of: receiving first encoded data and first encoded data description information describing the first encoded data among contents encoded with the second encoded data, receiving the file including the first encoded data in non-real time according to the first encoded data description information, receiving the file in non-real time according to the first encoded data description information, And decoding the first encoded data and the second encoded data received in real time together to display the content.

According to another embodiment of the present invention, there is provided an information processing apparatus including first encoded data description information for describing the first encoded data among contents encoded with first encoded data and second encoded data, A receiver for receiving the encoded data in non-real time and receiving the second encoded data in real time, a broadcast technology information decoding unit for decoding the received first encoded data description information, and a decoding unit for decoding the decoded first encoded data And a control unit for decoding the first encoded data and the second encoded data according to the descriptive information, and outputting a program by combining the decoded first encoded data and the second encoded data.

The first encoded data description information includes a channel identifier, a program identifier, and an identifier of the second encoded data from which the first encoded data is received.

The first encoded data description information may include storage permission information for the first encoded data.

Wherein the storage permission information includes information indicating that the first encoded data is not permitted to be stored, information allowing temporary storage for the TIME-SHIFT function of the first encoded data, information for allowing the first encoded data to be stored for a limited period of time Information for allowing the first encoded data to be stored only for a limited number of reproduction times, and information for allowing the first encoded data to be stored permanently.

The first encoded data description information may include a reception start time of the first encoded data and a reception end time of the first encoded data.

The first encoded data description information may further include a file attribute descriptor describing an encoding method of the first encoded data.

The file attribute description information may include a media type of the first encoded data, a component type included in the media, a codec type of the first encoded data, and information on whether or not the first encoded data is encrypted.

The first encoded data description information may further include an identifier (file_id) of the first encoded data, position information (file_loacator) capable of receiving the first encoded data, and the second encoded data description information .

The second encoded data description information may further include channel information capable of receiving the second encoded data, a start time of receiving the second encoded data, and a reception end time of the second encoded data.

The first encoded data may be enhancement layer data according to SVC coding, and the second encoded data may be base layer data.

According to the embodiment of the present invention, high quality content can be prevented from being reproduced or reproduced according to whether some data of non-real time transmitted content is stored.

According to an embodiment of the present invention, information describing base layer or enhancement layer data transmitted in non-real time and real time data related thereto can be described.

According to the embodiment of the present invention, non-real-time data and real-time data related thereto can be combined to obtain high-quality contents only by an authorized user.

1 is a conceptual diagram for transmitting and receiving scalable video / audio data;
2 is a diagram illustrating a structure of a broadcast stream according to a scalable coding scheme;
3 is a diagram showing an embodiment of a decoder for decoding SVC or MVC coding data
4 is a diagram illustrating program description information including storage permission information of enhancement layer data;
5 is a diagram illustrating an example of enhancement layer description information including permission information of enhancement layer data
6 is a diagram showing an example of the storage permission information
7 is a diagram illustrating details of program description information including storage permission information for an enhancement layer of a high-quality program
8 is a view showing a detailed example of a descriptor for describing enhancement layer data
9 is a diagram showing an embodiment of a method of receiving a broadcast signal
10 is a diagram showing an embodiment of a broadcast signal receiving apparatus
11 is a diagram illustrating layer data description information
12 is a diagram illustrating information included in the NRT descriptor of FIG. 11
13 is a diagram showing a detailed example of an associated data descriptor
14 is a diagram illustrating an EIT that may include an associated data descriptor
15 is a drawing illustrating a table section as a detailed example of describing layer data description information
16 is a diagram showing a detailed example of the NRT descriptor
FIG. 17 is a diagram illustrating a specific example of an associated data descriptor
18 is a diagram illustrating a descriptor describing attributes of a file;
19 is a diagram illustrating an embodiment of a method of receiving base layer data as NRT service data using an NRT descriptor
20 is a diagram illustrating an embodiment for updating schedule information using a schedule information flag included in an associated data descriptor or associated metadata
21 is a diagram showing an embodiment of a broadcast signal receiving method including non-real-time service data and real-time service data
22 is a diagram illustrating an embodiment of a broadcast signal receiving apparatus;
23 is a view for explaining an embodiment of a broadcast signal receiving apparatus;
24 is a view for explaining another embodiment of the broadcast signal receiving apparatus
FIG. 25 is a view showing still another example of the broadcast signal receiving apparatus; FIG.

A service transmitted in real time (RT) is a service for receiving and displaying the on-air service currently being broadcasted by a receiver. A service transmitted in non-real time (NRT) But rather a service that receives and displays data at a specific point in time. The non-real-time service is a service for transmitting a program using an extra bandwidth among some broadcasting channels, especially broadcasting channels. The non-real-time service can be used for a service for storing and playing back data rather than real-

For example, the receiver may receive data transmitted in non-real-time and store the data in a storage medium, and may selectively or co-operate the received data and the stored data when a certain time or data related to the stored data is received have. A service transmitted in real time refers to a service that receives and displays in real time like current terrestrial broadcasting. For example, a broadcasting station transmits a real-time service and transmits video supplementary information such as a news clip, weather information, advertisement, Push VOD, EPG, and enhancement video layer through a non-real-time service.

On the other hand, it is necessary to prevent unauthorized recording and copying of high-resolution video contents using a scalable coding scheme (or a multi-view video coding scheme). The embodiment described below separates the base layer and the enhancement layer of video / audio according to the scalable coding scheme into a real time (RT) service or a non-real time (NRT) service, It is possible to prevent unauthorized recording and duplication. A detailed example is as follows.

Hereinafter, an example of transmitting video / audio according to a scalable coding scheme is described, but an example of transmitting video data for each view according to a multi-view video coding scheme is also applicable. That is, the user can view data at a desired view point by transmitting different data captured by a plurality of cameras at a plurality of viewpoints in non-real time. As another example, in a receiver having a capability of processing 3D, 3D related information data transmitted in non-real time is received, and 3D additional information stored when 2D data is broadcast in real time is applied to a receiver It is also possible to view the broadcast with 3D data instead of 2D data.

1 is a conceptual diagram for transmitting and receiving scalable video / audio data. scalable video / audio data can be transmitted in real-time service RT data and non-real time service (NRT) data.

A broadcasting station or a service provider can transmit scalable coded video / audio data separately for each layer. For example, a broadcasting station may transmit base layer data and enhancement layer data to a real-time service or a non-real-time service, respectively.

A high-end device can combine enhancement layer data with base layer data received in real-time or non-real-time. In a high-end device, either base layer data or enhancement layer data can be received as real-time service data and the other as non-real-time service data, and the two service data can be combined and displayed.

However, a low-end device that can not process scalable video coding data can only display base layer data.

2 illustrates a structure of a broadcast stream according to a scalable coding scheme. For example, when a video stream according to a scalable coding scheme is transmitted, base layer data and enhancement layer data can be multiplexed and transmitted to each other on a frame basis. Base layer video frame 1 followed by enhancement layer video frame 1, base layer video frame 2 followed by enhancement layer video frame 2. Data coded by a multi view video coding (MVC) scheme can be transmitted as well. Base layer data or enhancement layer data can be transmitted in non real time and stored in the receiver. In addition, enhancement layer data corresponding to a base layer transmitted in a non-real-time service or base layer data corresponding to an enhancement layer transmitted in a non-real-time service can be received in real time. Therefore, it is possible to display the high-quality content in combination with the stored non-real-time service at the time when the real-time service is received. Operations to store non-real-time services or operations to combine non-real-time services and real-time services can be provided only to users of a particular receiver, thereby granting limited rights to viewing and storing high-quality content.

FIG. 3 shows an embodiment of a decoder for decoding SVC or MVC coding data. Since the principle of decoding the SVC or MVC coding data is the same, this embodiment illustrates the operation of the decoder of the SVC coding data.

When the data in which the base layer data and the enhancement layer data are multiplexed is input to the demultiplexer, the demultiplexer can separate the base layer data and the enhancement layer data and output them. The base layer decoder decodes the base layer data and stores the decoded data in a base layer picture memory. The enhancement layer decoder decodes the enhancement layer data and stores the decoded enhancement layer data in an enhancement layer picture memory.

The interlayer prediction unit (or the inter-view prediction unit) outputs the high-definition video data using the base layer enhancement layer data (or multi-view data) stored in the base layer picture memory and enhancement layer picture memory.

On the other hand, a receiver that can not process enhancement layer data has only a base layer decoder, so it can decode base layer data and output low-quality video data.

The first encoded data and the second encoded data may be decoded and combined according to the content reproduction quality after each data of the content is encoded into the first encoded data and the second encoded data according to the encoding method, And the second encoded data may be decoded. As the encoding / decoding method, there are SVC and MVC for video data. Hereinafter, for convenience of explanation, an example in which SVC-coded base layer data and enhancement layer data are separately transmitted in real time / .

As a first embodiment, information for controlling selective storage of enhancement layer data of a program may be transmitted and received. The receiver can then selectively store enhancement layer data of the program to control unauthorized recording of high quality video / audio data.

As a second embodiment, base layer data or enhancement layer data can be separately transmitted in real time or in non-real time, and information allowing only allowed users to combine layer data can be transmitted and received. Thus, it is possible to provide high-quality / high-effect video / audio data selectively to an authorized user.

In order to combine base layer data or enhancement layer data transmitted in real-time or non-real-time, information describing the relationship between base layer data and enhancement layer data is required. For example, when base layer data is transmitted in non-real-time and stored in a receiver, and enhancement layer data is transmitted in real time, information about when and which program's enhancement layer data is displayed is transmitted and received .

When base layer data or enhancement layer data is transmitted in a non-real-time service, non-real-time data description information is transmitted first or together. And non-real-time data description information may include descriptive information of real-time data information that can be combined with the non-real-time data. The real-time data description information may be transmitted separately from the non-real-time data description information. Then, the real-time data is combined with the non-real-time data already stored using the real-time data description information. Real-time data or non-real-time data can be base layer data or enhancement layer data. Therefore, high-quality video / audio data can be reproduced through a channel through which real-time / non-real-time data is transmitted.

Hereinafter, the first embodiment and the second embodiment will be described in order.

4 is a diagram illustrating program description information including storage permission information of enhancement layer data. When base layer data or enhancement layer data of a program is transmitted, program description information including storage permission information for the enhancement layer data of the program can be transmitted and received first. The program description information may include a channel identifier, a program identifier, an identifier of base layer data, and an identifier of enhancement layer data.

A channel identifier indicates an identifier of a channel capable of receiving a program. If the receiver is a terrestrial or cable broadcast receiver, it may be an identifier of a physical channel or a logical channel. For example, information such as carrier frequency, channel TSID, program number, and source id may correspond to this. When a receiver receives a program on the Internet, such as IPTV, information about IP address information or flute session may be a channel identifier. The receiver can tune to the corresponding service location using the channel identifier.

A program identifier indicates an identifier of an event or a program among service data transmitted through a channel, an IP address, or a session indicated by the channel identifier. A program or an event is an element included in one service, and data for video, audio, and data broadcasting may correspond to a program or an event. This may be the program number, major / minor channel identifier, content id, and event id.

The base layer data identifier and the enhancement layer identifier include information that can identify base layer data or enhancement layer data included in a high-quality program. For example, in the case of IP / UDP, the base layer or enhancement layer can be identified by using the port number of the UDP header. The base layer data identifier, enhancement layer identifier may be identified by the PID of the packet or a new stream type. A more detailed embodiment of FIG. 4 will be described below.

Permission information on enhancement layer data can be transmitted so that copying is not free for high-resolution video / audio data.

FIG. 5 shows an example of enhancement layer description information including permission information of enhancement layer data. The storage permission information of the enhancement layer data includes a program identifier, attribute information of an enhancement layer, and storable information.

The program identifier indicates a program identifier related to the enhancement layer data. The attribute information of the enhancement layer is attribute information defined by the SVC, and may include information for allowing the receiver to refer to the coding information when combining the SVC coded data. For example, the attribute information of the enhancement layer of the video data may include nal_unit_header_svc_extension information defined in ISO / IEC 14496-10 annex G and other video attribute description information. The video attribute description information may be information such as scalability type, video frame rate, and resolution when enhancement layer data is decoded.

The storage allowance information indicates whether or not enhancement layer data can be stored in the SVC coding data. Detailed examples are described with reference to the following drawings.

In this way, information on the storage permission of the enhancement layer data can be transmitted / received among data coded by the SVC, and the receiver stores the enhancement layer data according to the storage permission information, thereby preventing unauthorized copying of the content of the svc coding method . The enhancement layer description information may have a table section or an XML format, which will be described in detail later.

6 shows an example of the storage permission information. The storage permission information is information for controlling whether or not the enhancement layer data is stored in the receiver.

In this example, no recording is information that prevents the receiver from storing enhancement layer data. Buffering for time-shift allowed allows the receiver to store enhancement layer data only for time shift functionality. The time shift function temporarily stores the received data and outputs the data, thereby displaying a video signal having a time difference compared with a case where the received data is immediately decoded and output. Therefore, a receiver that does not have the ability to process SVC-coded data or does not have a time shift function can not store or process enhancement layer data according to this information.

Recording allowed with expiration date indicates the storable information that allows the receiver to store enhancement layer data for a limited period of time.

Recording allowed with limited number of playback indicates information that allows the enhancement layer data to be stored only until the receiver has a limited number of regeneration times and to erase the stored enhancement layer data if the number of times is exceeded.

Permanent storage allowed indicates the ability of the receiver to store enhancement layer data.

7 is a diagram illustrating details of program description information including storage permission information of an enhancement layer of a high-quality program. Here, the program description information illustrates a table section type. Enhancement layer program description information can be sent to VCT or PMT in either descriptor or table format. In this drawing, the table section of the program description information is referred to as video_layer_info_table_section. The Table_id field indicates the identifier of this table, and the zero field and reserved can be included. Section_length indicates the length of the section, and after the zero field, the protocol_version field contains the version information of the corresponding table section.

First_index represents the index of the enhancement layer data unit described by this table section. When more than one enhancement layer data unit is transmitted, first_index may indicate the index information of the data units by a value from 1 to 255.

Number_of_programs represents the number of programs corresponding to enhancement layer data.

For each program, channel information to which the corresponding program is transmitted using a major channel number, a minor channel number, and a channel TSID may be defined. At least one of the three fields may correspond to the channel identifier of FIG. 4 .

The program number and the source_id are identification information of each program, and at least one of the two fields can correspond to the program identifier of FIG.

Base_layer_video_PID and enhancement_layer_video_PID indicate the PIDs of base layer data and enhancement layer data, respectively. These two fields may be the base layer video identifier and the enhancement layer video identifier of FIG. 4, respectively.

As enhancement layer description information, a descriptor describing enhancement layer data may be included in this table section.

8 is a diagram showing a detailed example of a descriptor for describing enhancement layer data.

 Descriptor_tag and descriptor_length each indicate an identifier and a length of the descriptor.

Enhancement_layer_video_PID is an identifier of a packet that transmits enhancement layer data. The enhancement layer video packet identifier may correspond to Enhancement_layer_video_PID described in video_layer_info_table_section which is program description information.

The enhancement_type may be a value referred to as spatial scalability, temporary scalability, or SNR (quality) scalability. The receiver can use this value to know the scalability type of Enhancement_layer_data.

The Video_width field and the Video_height field represent the width and height of the high-quality video reproduced on the screen, respectively. The Frame_rate and video_bit_rate fields indicate the frame rate and the video bit rate of video data to be described, respectively.

The Record_enable_code field is storage permission information of enhancement layer data, and may be the value illustrated in FIG.

The Record_attributes field can control the stream to be stored if the receiver stores the enhancement layer data according to record_enable_code. For example, if the record_enable_code is "Recording Allowed with Expiration Date ", the expiration date or time may be indicated. As another example, it is possible to relatively express the storable date. That is, if this field has a value of n, the receiver can delete the enhancement layer data after n days of storage.

If the record_enable_code has a value corresponding to "Recording Allowed with Limited Number of Playback ", the record_attributes field may indicate the number of reproducible times of the stream.

If the record_enable_code has a value corresponding to "Buffering for Time-shift Allowed" and the record_attributes field has a value of 0, the time-shift function is performed within the time range supported by the receiver. Or record_enable_code has a value corresponding to "Buffering for Time-shift Allowed ", record_attributes may indicate the time (e.g., expressed in seconds) during which the receiver performs the time-shift function.

9 is a diagram illustrating an embodiment of a method for receiving a broadcast signal.

The program description information including the storage permission information on the enhancement layer data of the program A is received (S110). The program description information including the storage permission information for the enhancement layer data of the program A can be received in the table section (FIG. 7) or in the IP packet.

The base layer data and the enhancement layer data of the program A are received (S120). If the enhancement layer data of the program A can be stored according to the program description information (S130 yes), the value for the storage permission information for the enhancement layer data (S140).

The enhancement layer data of the program A is stored according to the storage allowance information of the enhancement layer data of the program A (S150). An example of the storage permission information may have a value illustrated in FIG.

For example, if the storage permission information does not permit storage of enhancement layer data, the enhancement layer data of program A is not stored but only base layer data is stored (S151).

Alternatively, the storage permission information may be information that allows temporary storage of the enhancement layer data of the program A. In such a case, the enhancement layer data of program A is temporarily stored for the time-shift function. (S153)

If the storage permission information is information that restricts the enhancement layer data to be reproduced for a limited number of times or a limited time, the enhancement layer data of the program A is stored until the number of times or the time is reproduced (S155).

If the storage permission information is information for allowing the enhancement layer data to be stored without limitation, enhancement layer data is permanently stored (S157).

If the enhancement layer of program A can not be stored (S130 no), the enhancement layer data associated with program A is not stored. Therefore, it is possible to view the high-quality video only when viewing the program A in real time (S160).

The base layer and the enhancement layer can be transmitted in real time or non-real time, respectively. In this case, the storage permission information of the enhancement layer data can also be included in the enhancement layer data description information. This embodiment will be described later.

Accordingly, the storage allowance information for selectively storing the enhancement layer data for the program A is stored, thereby allowing reproduction and storage of a program provided as a high-quality service only by a user or a receiver having a specific function.

10 is a diagram showing an embodiment of a broadcast signal receiving apparatus. Although the broadcast signal receiving apparatus exemplifies the case of storing enhancement layer data of an SVC transmitted in non-real time using the storage allowance information to display high-quality video, the same concept is applied to audio data or MVC coded data Can be applied. A stream filter 1, a storage control unit 2, a metadata generating unit 3, a storage unit 4, a video demultiplexing unit 5, A first decoder 6, a second decoder 7, a first video storage 8, a second video storage 9, and a video combiner 10.

The stream demultiplexer (0) can receive the multiplexed broadcast signal and divide it into a stream to be stored and a stream to be output. For example, the video demultiplexer 5 separates base layer data and enhancement layer data in order to directly store the received high quality video.

The first decoder 6 decodes the enhancement layer data and the second decoder 7 decodes the base layer data. For example, the first decoder 6 and the second decoder 7 can decode video data composed of a video algorithm such as H.264. The first video storage unit 8 stores decoded enhancement layer data, and the second video storage unit 9 stores decoded baselayer data. The video combining unit 10 may combine base layer data and enhancement layer data using inter-layer predication to output high quality video data. If video data of the base layer decoded by the second decoder 7 is output, low-quality video is output. The first decoder 6 and the second decoder 7 can decode the base layer and the enhancement layer transmitted in real time to display high quality video

On the other hand, although not shown, the stream demultiplexer 0 can receive and demultiplex the program description information describing the enhancement layer data of the program A to be received and reproduced in non-real time or real time. Examples of the program description information are illustrated in Figs. 4, 5, 7 and 8, and the program description information may be decoded and stored in the storage unit 4 or in a separate program description information storage unit (not shown) .

When enhancement layer data is transmitted in non-real time, the stream demultiplexer (0) can demultiplex a stream transmitted in non-real time according to the program description information. For example, data transmitted in non-real-time can be identified by a specific PID, and when transmitted in an IP / UDP stream, it can be identified by a port number of a UDP header or the like.

The stream filter 1 illustrated here can selectively filter the enhancement layer data based on the PID of the packet transmitted in non-real time according to enhancement layer description information of the program description information

That is, the program A transmitted in real time and composed only of the base layer is played back in real time through the video demultiplexer 5 and the second decoder 7, and enhancement layer description information related to the program B, Data may be transmitted together with the program A. The enhancement layer description information and the enhancement layer data are stored in the storage unit 4 via the stream filter 1 and the storage control unit 2. Meta data for enhancement layer data may be generated and stored in the metadata storage unit of the storage unit 4 when the metadata is stored in the storage unit 4. If the base layer of program B is broadcast later, the receiver can reproduce the program with high quality by combining the stored enhancement layer data with the broadcast base layer.

The storage control unit 2 stores the enhancement layer data in the storage unit 4 in accordance with the storage permission information of the program description information. For example, the storage controller 2 may store a packet corresponding to enhancement layer data using a PID of enhancement layer data. The storage permission information is illustrated in FIG. Depending on the storage allowance information, the enhancement layer data may not be stored, limitedly stored, or permanently stored. If the storage is restricted, it can be temporarily stored for performing time shifting function, stored only for a specified period, or reproduced for a specific number of times.

At this time, the metadata generation unit 3 may separately generate metadata for enhancement layer data and store the metadata in the storage unit 4. The metadata may include information on the playback time (start time or end time) of the corresponding enhancement layer data, the video data frame corresponding to the specific time point, the playback interval, and the like. The metadata generating unit 3 may generate meta data on a transport packet basis and store the generated meta data.

The enhancement layer data can be uploaded using the description information of the layer data obtained from the broadcast signal and decoded together with the base layer data. A detailed example will be described later.

The storage control unit 2 can upload the enhancement layer data from the storage unit 4 using the program description information or the metadata. The uploaded enhancement layer data may be input to the first decoder 6 and decoded according to the storage permission information.

According to the illustrated program description information or storage permission information, enhancement layer data received in non-real time can be combined with base layer data transmitted in real-time or non-real-time to display high-quality video.

Although the above description focuses on processing of video data, the stream demultiplexer 11 may demultiplex stream data, for example, video data and audio data encapsulated. The demultiplexed video / audio data can be stored in encapsulated units.

Hereinafter, an embodiment will be described in which base layer data and enhancement layer data are divided into real-time or non-real-time data to restrict high-quality program copying.

Conventional pay-per-view (PPV) programs use service protection methods such as CAS to limit the use of services, but this approach has allowed unauthorized copying of services when the CAS algorithm is destroyed.

Here, the base layer data for the program to be protected is transmitted in real time, enhancement layer data is transmitted in non-real time, or the base layer data is transmitted in non-real time and enhancement layer data is transmitted in real time to transmit service use An example is disclosed. Base layer data and enhancement layer data must be combined to obtain a high quality program, which can restrict viewing and copying to high quality programs.

Hereinafter, when layer data of either base layer data or enhancement layer data is transmitted in non-real time or real time, information describing the layer data is transmitted. An embodiment is disclosed in which layer data description information is transmitted in real-time or non-real-time to combine with real-time or non-real-time data to be transmitted. The layer data description information may be transmitted in IP or in a table section such as PSI / PSIP. IP, layer data description information can be accessed through SDP, such as ESG or EPG transmission. Here, an example of transmitting the layer data description information in the form of a table section is exemplified.

11 is a diagram illustrating layer data description information. The layer data description information may describe real-time service data or specific layer data transmitted in non-real-time service data. For convenience of explanation, the case where specific layer data is transmitted as non-real-time service data will be described as an example.

Accordingly, the layer data description information illustrated herein may describe base layer data or enhancement layer data to which non-real-time service data is transmitted. Specifically, examples of the layer data description information may include a channel identifier, a program identifier, a service type, a layer type, and an NRT descriptor.

The channel identifier indicates a channel identifier for receiving non-real-time data. When a receiver receives a service on the Internet, such as IPTV, the channel identifier may be IP address information or flute session information. The receiver can use this information to receive services from the identified service location.

A program identifier indicates an identifier of an event or a program among service data transmitted through a channel, an IP address, or a session indicated by the channel identifier. A program or an event is an element included in one service, and may be video, audio, and related data. For example, the program number, the major / minor channel identifier, the content id, and the event id.

The service type indicates whether the data to be described is real-time service data or non-real-time service data. Here, since the base layer data or the enhancement layer data is transmitted as a non-real-time service, the service type can represent a non-real-time service.

The layer type indicates whether the data to be transmitted according to the service type is a base layer or an enhancement layer.

The layer data description information may include an NRT descriptor, and the NRT descriptor may describe non-real-time service data identified by the layer data description information. This will be described in detail.

12 is a diagram illustrating information included in the NRT descriptor of FIG. The NRT descriptor may describe the file descriptor, start time, end time, and associated metadata.

The file descriptor includes information on a file name, a file identifier, a file locator, a file type, a file size, and a file attribute transmitted in a non-real-time manner.

The file name indicates the file name to be transmitted in non-real time. The file identifier indicates an identifier of a file, not a broadcast stream, but can be used as information for identifying a program.

The file locator is a location capable of receiving a file transmitted in non-real time, and may include information such as an IP packet transmitted in a broadcast signal. The file type may indicate whether the file is an audio file or a video file. The file size indicates the size of the file transmitted in non-real time. The attribute of the file is attribute information about data transmitted in non-real time, and may include information on frame rate, video resolution, bit rate, type of codec and the like when the data is video.

The start time and the end time indicate the transmission start time and the transmission end time of the non-real time transmission file, and it is possible to know when to receive the non real time file. The NRT descriptor may include information on the start time and the duration, not the start time and the end time.

Associated metadata can describe data associated with non-real-time transfer files. If the non-real-time file is the base layer data, the associated metadata is metadata of enhancement layer data transmitted in non-real time or real time. If the non-real time file is enhancement layer data, the associated metadata is base Represents metadata of layer data. Associated metadata can include schedule information for associated data.

Associated metadata may include associated data descriptors, associated data schedule information, and associated data details.

The associated data descriptor may include an enhancement layer, which is associated data of data transmitted in non-real time, or a descriptor that describes base layer data, which will be described in detail later.

Associated metadata includes time information of associated data of non real-time data, for example, transmission start time and end time of data transmitted in real time. Or transmission start time and duration of real time data.

The associated layer info of the associated layer data may additionally include detailed information about other real-time data.

Associated metadata or associated data descriptors may be included in other PSI / PSIP table sections or layer data description information in addition to NRT descriptors.

13 shows a detailed example of an associated data descriptor. If the layer data description information includes base layer data (or enhancement layer data) transmitted in non-real time, the associated data descriptor can describe enhancement layer data (or base layer data) transmitted in real time. Layer layer data (or enhancement layer data), which is real-time data, and enhancement layer data (or base layer data) in which the associated data descriptor is non-real-time data.

The associated data descriptor may include a channel identifier, a program identifier, a service type, a layer type, an associated layer identifier, a flag for schedule information, and related layer information.

The channel identifier is an identifier of a channel through which real-time data related to the non-real-time data is transmitted, and the program identifier indicates a program identifier of the real-time data.

The service type illustrates a service type of real-time data. For example, the service type may represent a video service or an audio service.

The layer type indicates whether the real-time data is base layer data or enhancement layer data.

The associated layer identifier indicates a transmission identifier of the data according to a layer type. For example, an associated layer identifier may have an IP address and port number if the associated layer data is transmitted in IP, and a PID value if transmitted in the MPEG-2 TS.

The previous schedule override flag is information for determining whether or not to override the previous schedule information (i.e. start time / end time according to the above example) when the associated data descriptor is continuously transmitted. Or the schedule information flag may be valid if the associated data descriptor (or associated metadata) is transmitted separately from the layer data description information or the NRT descriptor.

For example, schedule information of associated data (base or enhancement layer data) may be included in the layer data description information, or schedule information of real time data related to non-real time data may be included in the NRT descriptor and transmitted. In this case, it may indicate whether to use the schedule information of the transferred layer data description information or the schedule information of the associated data descriptor (or associated metadata).

More specifically, it is assumed that schedule information capable of receiving second layer data related to the first layer data is transmitted to information describing the first layer data. In such a case, an associated data descriptor (or associated metadata) describing the second layer data may be transmitted in a table such as an EPG, an ESG, or another PSIP having schedule information different from the schedule information.

Thus, the associated data descriptor (or associated metadata) may not match the schedule information contained in the EPG, ESG, or PSIP. The schedule information flag may indicate which of the two schedule information should be used to receive the second layer data of the receiving apparatus.

For example, when the schedule information flag of the associated data descriptor is set to 0, the start time and end time included in the associated data descriptor can be set as the start and end times of reception of the second layer data. The schedule information of the second associated data descriptor is ignored and the schedule information included in the EPG, ESG, and PSIP can be used for the second layer data reception time when the schedule information of the associated data descriptor is set to 1. That is, when the schedule information is set to 1, the start time and end time included in the previously received second layer data description information are updated with the start time and end time included in the EPG, ESG, and PSIP. Thus, the schedule information flag may indicate whether to update the reception schedule information of the associated data. This will be described in detail later in Figs. 14 and 20.

The associated layer information may include nal_unit_header_svc_extension information, which is SVC related encoding information defined in annex G of ISO / IEC 14496-10 when the associated layer data is video data, and other video attribute description information. For example, video attribute description information may include information such as scalability type, video frame rate, and resolution when the associated layer data is decoded.

14 shows a diagram illustrating an EIT that may include an associated data descriptor.

The table_id field (8 bits) indicates the identifier of the event information table section. section_syntax_indicator (1 bit) indicates that the EIT uses the MPEG long-form syntax.

The private_indicator field (1 bit) is set to 1 in PSIP.

The reserved field (2 bits) is an unconfirmed area set to 11.

The section_length field (12 bits) indicates the length of the EIT section.

The source_id field (16 bits) indicates the identifier of the source associated with the EIT.

The reserved field (2 bits) is an unconfirmed area set to 11.

The version_number field (5 bits) indicates the version of the table section, and the version_number field value is changed when the contents of the table are changed.

The current_next_indicator field (1 bit) indicates whether the EIT table section is currently applied or applied to the next table.

The section_number field (8 bits) indicates the number of sections to which event information is transmitted, i.e., the serial number of the section. This value increases from 0 to 1 as the section increases.

The last_section_number field (8 bits) indicates the last section number of the table section.

The protocol_version field (8 bits) indicates the protocol version of this table section.

The num_events_in_section field (8 bits) indicates the number of events included in the table section.

The reserved field (2 bits) is an unconfirmed area set to 11.

The event_id field (16 bits) indicates the identification number of the event to be described.

The start_time field (40 bits) indicates the start time of the event in UTC (Universal Time Coordinated).

The ETM_locatoin field (2 bits) indicates whether the ETT text is applied to the current event.

The length_in_seconds field (20 bits) indicates the duration of the event in seconds.

The Title_length field (8 bits) indicates the length of the next string.

The Title_text field () indicates the structure of the string that encodes the title of the event.

The reserved field (4 bits) is an unspecified area of 4 bits.

Descriptors_length indicates the length of the following descriptor.

In order to describe the layer data of the event according to each event identifier, the descriptor () may include the NRT descriptor and the associated data descriptor as illustrated above.

The EIT includes event identification information, which can be identified by the start time (start time field) and the length (length_in_seconds field) of the event. If the EIT includes the associated data descriptor, the receiver can update the schedule information with the start time field and the length_in_seconds field of the EIT according to the schedule information flag value of the associated data descriptor even if the NRT descriptor previously includes the schedule information. That is, the time information of the event included in the EIT can be used as the base layer data or the reception schedule information of the enhancement layer data. Thus, the receiver can update the schedule information with the time information included in the PSIP, the EPG, and the ESG information such as the EIT. Or the associated data descriptor schedule information to be transmitted later when the associated data descriptor is transmitted several times.

15 illustrates a table section as a detailed example of describing layer data description information. The table section describing the layer data is referred to as video_layer_service_table_section () here.

The Table_id field indicates an identifier of the layer data description information table.

Section_length indicates the length of the layer data description information table section, and the protocol_version field includes version information of the layer data description information table section.

First_index indicates the index of the layer data unit described by this table section and may have a value from 1 to 255. [ Number_of_services Represents the number containing the layer data to be described.

Number_of_programs indicates the number of programs corresponding to base or enhancement layer data to be described.

For base or enhancement layer data, the major channel number, minor channel number, and channel TSID correspond to the channel identifiers to which each layer data is transmitted.

The program number and source_id are identification information of a program including each layer data, and can correspond to the program identifier of FIG.

The Service_type indicates whether the layer data to be described is non-real-time service data or real-time service data.

Stream_layer_type indicates whether the described data is base layer data or enhancement layer data, and corresponds to layer_type in FIG.

Previous_shedule_override_flag corresponds to the schedule information flag described above. The receiver can use this field value to determine whether to override the schedule information on which the layer data is transmitted.

The Service_stream_PID field indicates a PID of a transport packet to which base or enhancement layer data is transmitted.

Transmission_start_time and transmission_end_time represent a start time and an end time at which base or enhancement layer data is transmitted, respectively.

The descriptor may be located in the associated data descriptor of FIG. 13 or may be located in the NRT descriptor.

16 is a diagram showing a detailed example of the NRT descriptor. Here, the NRT descriptor is referred to as a file descriptor. The File_descrptor includes the information described in FIG.

Descriptor_tag and descriptor_length indicate the identifier and length of the file_descriptor.

File_name represents the name of the file to be described, and file_id represents the identifier of the file. File_locator is a location information that can receive a file. For example, 32 bits out of 48 bits can be used to represent an IP address, and 16 bits can be used to describe a port number. File_type indicates the type of the content, such as whether the data transferred to the file is audio data or video data.

File_size represents the size of the file, and codec_type represents a coding algorithm for overwriting the file. For example, H.264 or MPGE-2 or SVC enhancement video may correspond to codec_type. Video_width and video_height represent the width and height of the video displayed on the screen by the video data, respectively, when the file includes video data.

Frame_rate represents the video frame rate for video data, and run_time is the time required to reproduce the video stream from beginning to end, expressed in seconds.

This file descriptor may be included in PSI / PSIP such as PMT and VCT in addition to the illustrated layer data description information.

Figure 17 is a specific illustration of an associated data descriptor.

As described, the associated data descriptor includes enhancement layer data for base layer data and base layer data for enhancement layer data. In other words, when base and enhancement layer data are transmitted independently, complimentary layer data for one layer data is described. For example, when receiving information describing or announcing a base layer video stream of a specific program using a layer data description table (VLST), information of the corresponding enhancement layer video stream is associated can be described by a data descriptor.

For example, when base layer video of program A is referred to as stream B and enhancement layer video is referred to as stream C, the receiver receives first layer data description information (a) including announcement information for stream B. Announcement information for the stream C can be obtained using the associated data descriptor included in the first layer data description information (a).

The announcement information for the stream C may also be received using the second layer data description information (b). At this time, if the second layer data description information (b) includes schedule information different from the information included in the announcement information of the stream B, the previous_schedule_override_flag is set to '1'. Then, the receiver can update the announcement information for the stream C by referring to the second layer data description information (b).

Specifically, each field will be described as follows.

Descriptor_tag and descriptor_length indicate the identifier and length of the associated data descriptor, respectively.

Associated_data_major_channel and associated_data_minor_channel represent the major channel and the minor channel, respectively, to which associated data is transmitted.

The associated_data_channel_TSID indicates the identifier of the transport stream to which the channel to which the associated_data is transmitted is transmitted.

associated_data_program_number represents the number of the program of associated_data. The associated_data_source_id indicates the identifier of the source of the associated_data.

The associated_data_service_type is a service type of associated_data and can represent a detailed service type such as a video service or an audio service.

associated_data_layer_type can indicate whether associated_data is a base layer or enhancement layer data.

Associated_data_transmission_start_time indicates a start time at which associated_data is transmitted, and associated_data_transmission_end_time indicates an end time at which associated_data is transmitted. The end time may be changed to the duration for which associated_data is transmitted.

The associated_data_elementary_PID indicates the identifier of the packet to which the elementary stream included in the associated_data is transmitted. associated_data_video_width and associated_data_video_height represent the width and height displayed on the screen when associated_data is video data.

associated_frame_rate and associated_data_bit_rate can describe the frame rate and bit rate of associated_data, respectively.

18 is a diagram illustrating a descriptor for describing attributes of a file. The descriptor describing the attribute of the file describes attributes of the file or layer data received in non-real-time or real-time so that the receiver can determine whether the receiver or the file or layer data received in real time can be reproduced in the receiver.

Descriptor_tag and Descriptor_length may be identifier and length information of this descriptor.

The file type represents a file attribute transmitted in non-real-time or real-time. For example, a file transmitted in non-real-time or real-time may have properties such as TS, MPEG-4, ES, and IP datagram.

Media_type is a type of media of a file transmitted in non-real-time or real-time, and may have media types such as video only, audio only, video and audio, and data.

The attribute of the corresponding layer data can be described by the number of each media type.

The Component_type indicates the type of component included in the media in each file. For example, video, audio, data, etc. may be components included in the media.

Codec_type is a coding / decoding type of the corresponding media, and may be a video coding scheme such as MPEG-2, H.264, HE-AAC, or an audio coding scheme.

The Profile_level_val may be set to a value that identifies the profile or level of each coding scheme.

Content_protection_flag is a value indicating whether a protection algorithm is applied to the content included in the file. For example, if the content_protection_flag is 1, the content protection algorithm is applied. If 0, the content_protection_flag can indicate that the protection algorithm is not applied. If a content protection algorithm is applied, a cryptographic decryption key may be needed to play the content.

The Service_protection_flag indicates whether or not the service protection algorithm is applied. For example, if this flag is 1, the service protection algorithm is applied, and if so, the service decryption key may be required to receive or download the file when the service protection algorithm is applied.

FIG. 19 shows an embodiment of a method for receiving specific layer data transmitted in non-real time using NRT descriptor, that is, layer data description information.

First, the NRT descriptor is received (S210). The NRT descriptor may be included in the layer data description information, and a detailed example is illustrated in FIG.

If the service type of the data described by the layer data description information corresponds to a non-real-time service (S220), the NRT descriptor is parsed (S230).

When the current time is the start time described in the NRT descriptor (S240), the non-real-time service data among the received broadcast signals is found and received using the information included in the NRT descriptor (S250).

Real-time data is received (S260). The non-real-time data may be base layer data or enhancement layer data.

The non-real-time data is stored until the current time becomes the end time of the description information of the non-real-time data (S270).

Therefore, the base layer data or enhancement layer data included in the broadcast signal is received and stored using the NRT descriptor in the layer data description information.

The receiver of the user who can provide the high quality service can display the high quality media by combining the stored base layer data or enhancement layer data with enhancement layer data or base layer data received in real time.

20 is a diagram illustrating an embodiment for updating schedule information using a schedule information flag included in an associated data descriptor or associated metadata.

The descriptor or layer description information including the schedule information is received and stored (S310). The schedule information of the second layer data related to the first layer may be included in the layer data description information describing the first layer or the layer data description information describing the second layer data or may be included in the NRT descriptor Or an associated data descriptor.

In step S320, it is determined whether the stored schedule information is available by using the schedule information flag included in the received descriptor or layer data description information. For example, when the schedule information other than the stored schedule information is included in the PSIP table, the EPG, or the ESG, the schedule information received and stored in S310 may not be used.

 Accordingly, when the schedule information flag indicates that the current schedule information is available (S320 yes), the second layer data is received using the schedule information included in the received layer data description information, and the first layer data and the 2 layer data is SVC-decoded to display high-quality video (S330).

On the other hand, the schedule information may be repeatedly transmitted to the specific layer data, or the already transmitted schedule information may be changed. Therefore, it is necessary to identify which of the plurality of schedule information is the updated schedule information.

Therefore, it is determined whether the schedule information flag is set to '1' in the newly received descriptor or layer data description information (i.e., whether newly received schedule information is available and to override the previous schedule information) (S340).

If the schedule information flag is set to 1 in the newly received descriptor or layer data description information, the schedule information is updated with the start time and end time of the newly received schedule information, ignoring the previously received schedule information (S350) .

If the received and stored schedule information is not available (S320 no), the ESG, EPG, PSI / PSIP table section, etc. are reproduced using the channel identifier or the program identifier described in the descriptor or the layer data description information including the schedule information (S360).

The schedule information included in the ESG, the EPG, and the PSI is obtained (S370).

The second layer data is received using the obtained schedule information, and the high-quality video is displayed using the received second layer data (S380).

21 shows an embodiment of a broadcast signal receiving method including data transmitted in non-real time or in real time.

 Either the base layer data or enhancement layer data is received and stored in non-real time (S410). The non-real-time data can be identified using NRT descriptor information included in the layer data description information or the layer data description information using the reception channel, reception time, and receivable content fields.

The associated data description information related to the non-real-time data is obtained from the information describing the non-real-time data (S430). Theassociated data description information is illustrated in FIG.

The channel to which the associated data is transmitted is tuned using the parsed associated data description information (S440).

In operation S450, base layer data stored as non-real-time service data or associated data including enhancement layer data or base layer data related to enhancement layer data is received in real time.

The stored non-real-time service data and the real-time service data are combined and output (S460). When base layer data is transmitted as non real-time service data and enhancement layer data is transmitted in real time, base layer data and enhancement layer data can be combined and displayed.

22 is a diagram for explaining an embodiment of a broadcast signal receiving apparatus. The disclosed broadcasting signal receiving apparatus can receive base layer data in real time in enhancement layer data in real time and decode both layer data together to display high quality video.

One embodiment of the broadcast signal receiving apparatus includes a stream demultiplexer 11, a system decoder 13, a first decoder 15 and a first memory 19, and includes a file filter 21, a storage controller 23, a storage unit 25, a second decoder 27, a second memory 29, and a video combining unit 17.

The stream demultiplexing unit 11, the system decoder 13, the first decoder 15 and the first memory 19 process data to be transmitted in real time and store the data in the file filter 21, the storage control unit 23, The first decoder 25, the second decoder 27, and the second memory 29 can process data transmitted in non-real time.

One embodiment of the broadcast signal receiving apparatus receives layer data description information or a table section including an NRT descriptor before receiving data transmitted in non-real time, and obtains information on non-real time data including the reception time of non-real time data You can get it in advance. Real-time data related to the non-real-time data can also be obtained from the associated data description information.

The file filter 21 can filter the file including the raw real-time data. The non-real-time data file may be a file in which base layer data, audio data, and metadata of the base layer data are encapsulated. The metadata may include reproduction information of non-real-time data. Metadata may be extracted from the encapsulated file and stored in the metadata storage unit of the storage unit 25. [

The storage control unit 23 stores the received non real-time data file in the storage unit 25, and can store the NRT data file using the layer data description information and the meta data. Although not shown in the drawing, a metadata generation unit may be provided to generate playback information on base layer data to be stored as separate metadata. The metadata generation unit may separately generate the metadata and store the metadata in the storage unit 25 It is possible.

The second decoder 27 may decode the base layer data uploaded from the storage unit 25 and store the decoded base layer data in the second memory 29.

The stream demultiplexer 11 can demultiplex real-time data into video, audio and data streams. The video stream may contain enhancement layer data of a particular program. The system decoder 13 can decode the video data encapsulated in the video stream and output the video data.

The first decoder 15 may decode the enhancement layer data and store the decoded enhancement layer data in the first memory 19.

The video combining unit 17 may decode enhancement layer data and base layer data stored in the first memory 19 and the second memory 29, respectively, and output high-quality video according to inter layer prediction.

The video combining unit 17 may decode the base layer data and enhancement layer data included in the program using a specific program identifier in the layer data description information. The broadcast signal receiving apparatus can identify non-real-time data and real-time data using the service type of the layer data description information, and can identify the base layer data and the enhancement layer data using the layer type.

In FIG. 22, a receiver stores base layer data information transmitted in non-real-time in advance and combines with base layer data stored when real-time enhancement layer data is transmitted to display high-quality data. In other words, since only enhancement layer data is transmitted in real time, a user who can only process base layer data or a user who is authorized to view only base layer data can not process or play the real time broadcast stream. The embodiment in Fig. 22 allows only an authorized user to watch a program normally, and an unauthorized user can not watch the program itself.

23 is a view for explaining another embodiment of a broadcast signal receiving apparatus. The disclosed broadcasting signal receiving apparatus receives enhancement layer data in non-real time, receives base layer data in real time, decodes both layer data together, and can display high quality video.

One embodiment of the broadcast signal receiving apparatus includes a stream demultiplexer 31, a system decoder 33, a first decoder 35 and a first memory 37, and includes a file filter 41, a storage controller 43, a storage unit 45, a second decoder 47, a second memory 49, and a video combining unit 50.

The stream demultiplexing unit 31, the system decoder 33, the first decoder 35 and the first memory 37 process real-time data and are supplied to a file filter 41, a storage control unit 43, a storage unit 45 ), The second decoder 47, and the second memory 49 can process non-real-time data.

Before receiving the non-real-time data, information on the non-real-time data including the reception time of the non-real-time data may be obtained in advance by receiving the layer data description information or the table section including the NRT descriptor.

The file filter 41 can filter files containing non-real-time data. The non-real-time data file may be a file encapsulated with metadata of enhancement layer data, audio and enhancement data thereof. Here, the metadata may include playback information of non-real-time data as described above.

The storage control unit 43 stores the received non-real-time data file in the storage unit 45, and can store the non-real-time data file stored using the layer data description information or the metadata. Similarly, this embodiment may include a metadata generation unit that generates playback information for enhancement layer data as separate metadata. The metadata generation unit may separately generate the metadata and store the metadata in the storage unit 45. [

The second decoder 47 may decode the enhancement layer data uploaded from the storage unit 45 and store enhancement layer data decoded in the second memory 49.

The stream demultiplexing unit 31 can demultiplex real-time data into video, audio, and data streams. The video stream may contain base layer data of a particular program. The system decoder 33 can decode the video data encapsulated in the video stream and output the video data.

The first decoder 35 may decode the base layer data and store the decoded base layer data in the first memory 37.

The video combining unit 50 decodes base layer data and enhancement layer data stored in the first memory 37 and the second memory 49 together with a specific program identifier in the layer data description information, It can output high-quality video.

Since the base layer data information is transmitted in real time in FIG. 23, a user who is not authorized to the enhancement layer data can view the program composed only of the base layer, but can not receive or process the enhancement layer data. I can not watch it.

In the embodiments of FIGS. 22 and 23, the video combiner 17, 50 may use the picture number of the video elementary stream to synchronize the two video layers. However, in this case, the first decoders 15 and 35 and the second decoders 27 and 47 temporarily store base layer data or enhancement data in the buffer. The picture number may be assigned on a frame or field basis, and the decoding or display of the video may be performed according to the picture number.

The video / audio data can be encapsulated and transmitted in the transmission packet of the video / audio data. When video / audio data is output synchronously at the encapsulation layer level, video decoding or display may be performed according to the picture number assigned to the IP, UDP, or RTP packet level.

The storage controllers 23 and 43 may upload base layer (or enhancement layer) data having a picture number corresponding to the picture number of the encapsulated enhancement layer (or base layer) data received in real time. The video combining unit 17 and 50 may combine enhancement layer base layer data and enhancement layer data based on the picture number to synchronize two separately transmitted layer data. The storage control units 23 and 43 have buffers and upload base layer (enhancement layer) data having a necessary picture number from the storage units 25 and 45 in advance. Then, the uploaded data can be output to the first decoder or the second decoder.

24 is a diagram for explaining another embodiment of the broadcast signal receiving apparatus. One embodiment of the broadcast signal receiving apparatus includes a stream demultiplexer 51, a system decoder 53, an input switch 55, a first decoder 57, and a first memory 59 A file filter 61, a storage control unit 63, a storage unit 65, a second decoder 67, a second memory 69, and a video combiner 70.

One embodiment of the illustrated broadcast signal receiving apparatus is similar to the previously disclosed embodiments, except that the input selector 55 may provide identification information on whether data transmitted in real time or in non-real time is base layer data or enhancement layer data And output necessary data to respective decoders in accordance with the identification information.

The stream demultiplexer 51, the system decoder 53, the first decoder 57 and the first memory 59 process the enhancement layer data and store the enhancement layer data in the file filter 61, the storage controller 63, 65, the second decoder 67, the second memory 69, and the video combining unit 70 can process base layer data.

Real-time data including the reception time of non-real-time data can be obtained in advance by receiving the layer data description information or the table section including the NRT descriptor before receiving the data in non-real-time.

The file filter 61 can filter the file including the raw real-time data. Non real-time data files can be enhancement layer data and metadata of enhancement layer data encapsulated in transport packets. The metadata may include non-real-time data playback information. Metadata may be extracted from the encapsulated file and stored in the metadata storage unit of the storage unit 65.

The storage control unit 63 may store the received non real-time data file in the storage unit 65 and may store the non-real-time data file stored using the layer data description information or the metadata.

The storage control unit 63 can output the non-real-time data stored in the storage unit 65 to the input selection unit 55.

On the other hand, the stream demultiplexer 51 can demultiplex the data transmitted in real time into video, audio, and data streams. The video stream may contain base layer data of a particular program. The system decoder 53 may decode the video data encapsulated in the transmission packet in the video stream and output the video data to the input selection unit 55.

The input selector 55 identifies the base layer data decoded by the system decoder 53 or the enhancement layer data uploaded by the storage controller 63 and outputs the data to the first decoder 57 and the second decoder 67 can do. The input selector 55 can obtain base layer / enhancement layer data information included in the layer data description information, the NRT descriptor, and the associated data descriptor. The information contained in the layer data description information, the NRT descriptor, and the associated data descriptor has already been described.

The first decoder 57 may decode the enhancement layer data and store the decoded enhancement layer data in the first memory 59.

The second decoder 67 may decode the base layer data and store the decoded base layer data in the second memory 69.

The video combining unit 70 may decode enhancement layer data and base layer data stored in the first memory 59 and the second memory 69 together to output high quality video according to inter layer prediction.

The video combining unit 70 may decode the base layer data and the enhancement layer data included in the program using a specific program identifier in the layer data description information. The broadcast signal receiving apparatus can identify non-real-time data and real-time data using the service type of the layer data description information, and can identify the base layer data and the enhancement layer data using the layer type.

The enhancement layer data may be stored according to the storage permission information in the layer data description information. The descriptor including the storage permission information is illustrated in FIG.

When enhancement layer data is allowed to be stored, high quality video data can be displayed in combination with base layer data transmitted in real time. If storage is allowed, it may be possible to limit storage for a certain number of times or for a period of time, or to allow persistent storage. Or for certain functions such as time-shift.

Alternatively, if enhancement layer data is not allowed to be stored, low-quality content containing only base layer data is displayed.

Fig. 25 discloses another example of a temporary example of a broadcast signal receiving apparatus. One embodiment of the disclosed broadcast signal receiving apparatus can decode the information on the file attribute shown in Fig. 18 and determine whether the file decoded from the information about the file attribute is a file that can be reproduced by the broadcast signal receiving apparatus.

A demodulator 120, a demultiplexer 130, a service decoding module 133, a first switching unit 135, a content decoding module 137, and a content decoding unit 137. The receiving unit 110, the demodulating unit 120, A first signal parsing unit 141, a second signal parsing unit 145, a storage control unit 150, a temporary storage unit 155, a storage unit 160, a packet processing unit 180, a broadcast technology information decoding unit 200, a broadcast information handler 210, a second switching unit 220, an A / V decoding unit 230, and a control unit 310.

The receiving unit 110 receives, for example, a terrestrial broadcast signal and tunes a desired one of the broadcast signals. The receiving unit 110 may receive the real-time stream and the non-real-time stream.

The demodulator 120 demodulates the broadcast signal of the received channel. For example, when the broadcast signal is a VSB modulation signal, the VSB demodulation process is performed.

The demultiplexer 130 demultiplexes the real-time stream and the non-real-time stream from the broadcast signal. For example, the demultiplexer 130 may demultiplex a real-time stream and a non-real-time stream according to a packet identifier.

The content transmitted in non-real-time can be transmitted in the form of a transport packet (TP), an IP packet, or a file included in the packet.

The first signal parser 141 can decode the transmission file including the content transmitted in the non-real time. The first signal parser 141 may obtain the metadata of the non-real-time file included in the transport packet. For example, transport packets can be parsed according to ISO / IEC 13818-6 DSM-CC. When the packet for transmitting the non-real-time data is encrypted by the service encryption algorithm, the first signal parser 141 can decode the non-real-time data included in the packet. For example, the first signal parsing unit 141 obtains whether or not the file attribute description information illustrated in FIG. 18 is encrypted according to the service protection flag, and the first signal parsing unit 141 can perform the service decoding algorithm in the TP file according to the file attribute description information have.

The second signal parser 145 may decode non-real-time content or metadata included in the IP packet. Or the second signal parser 145 may decode the content file object or metadata included in the IP packet. For example, according to ATSC A / 90 or A / 92, an IP packet may be included in a transport packet or the second signal parsing unit 145 may decode non-real-time content or metadata of a file format included in a transport packet . The content file object may be encapsulated in UDP, ALC / LCT, and FLUTE according to RFC 3926, and the second signal parser 145 may decapsulate the encapsulated file object.

The content encryption module of the second signal parsing unit 145 may encrypt the decapsulated file and transmit the decrypted file to the storage controller 150 to store the encrypted file in the storage unit 160. The content encryption module obtains encryption information for the obtained content of the file object according to the file attribute description information of the layer data, and encrypts and outputs the content according to the obtained information.

Meanwhile, the demultiplexer 130 demultiplexes the real-time stream. When the real-time stream is encrypted, the service decryption module 133 can decrypt the encrypted base layer (or enhancement layer) data according to the file attribute description information.

The decrypted real time stream is sent to the content encryption module 137 or to the first switching unit 135.

The content encryption module of the second signal processing unit 145 or the content encryption module 137 can encrypt the content according to the file attribute description information.

The storage control unit 150 may store the delivered real-time content in the storage unit 160, store the non-real-time delivered content, or upload the stored content. The storage control unit 150 may receive the transport packet TP from the first signal processing unit 141 or may receive the file from the IP packet or FLUTE session from the second signal processing unit 145. [ A transport packet (TP), an IP packet, or a FLUTE session may include content transmitted in non-real time.

The storage control unit 150 may include a download control unit for controlling downloading of content to the storage unit 160 and an upload control unit for reproducing the content stored in the storage unit 160. [ The download control unit may receive the encrypted file from the content encryption module of the second signal processing unit 145 or may store the encrypted transport stream in the storage unit 160 from the content encryption module 137 encrypting the live stream.

The upload control unit of the storage control unit 150 may include a switch unit for reproducing stored files or packets. The storage control unit 150 may implement the PVR function and may store the metadata of the non-real-time data generated by the metadata generating unit. Alternatively, the storage unit 150 may store a transport packet, IP IP packet, or metadata included in a file transmitted in a broadcast signal. The upload control unit of the storage control unit 150 can decrypt each piece of content according to the file attribute description information of the file or packet when the packet to be uploaded or the content to be delivered by the file is encrypted.

The storage control unit 150 may not store, temporarily store, or store the NRT data according to the storage permission information of the NRT data decoded by the broadcast description information decoding unit 200. [

The storage control unit 150 switches the uploaded file or packet, and the decrypted file is transferred to the second switching unit 220, and the decrypted packet is transmitted to the first switching unit 135.

The storage unit 160 may store the non-real-time transmitted content, the metadata describing the playback time of the content, and the encrypted decryption key transmitted in real-time or in real time.

The first switching unit 135 selectively outputs a packet transmitted in real time or a packet uploaded from the storage unit 160 (not shown).

The packet processing unit 180 can separate the broadcast technology information such as PSI / PSIP from the transport packet and reconstruct the transport packet into the PES. The packet processing unit 180 outputs a PSIP table section or layer data description information including an NRT descriptor, an associated data descriptor, and file attribute description information to the broadcast description information decoding unit 200.

The broadcast technology information decoding unit 200 decodes the received layer data or information on whether the received layered data or file has been coded or encrypted by an algorithm that can be decoded by the broadcast signal receiving apparatus in accordance with the file attribute information shown in Fig. . Based on the decoded information, the broadcast signal receiving apparatus can decode only the encoded media or components of the media with a processable algorithm, and decide not to process the remaining data. The service decryption module 133, the service decryption module of the first signal processing unit 145, the content encryption module of the second signal processing unit 145, the content encryption module 137, and the content decryption module of the storage control unit 150, The encryption / decryption algorithm included in the file attribute description information decrypted by the decryption unit 200 can encrypt or decrypt the corresponding data.

The broadcast technology information decoding unit 200 decodes the PSIP table section and the layer data description information, and outputs the event information including the schedule among the broadcast description information to the broadcast information handler 210. The broadcast information handler 210 may collect event information of a broadcast signal and provide broadcast information including event information to a user.

For example, the broadcasting technology information decoding unit 200 may include program description information including information on whether or not to store data transmitted in non-real time in FIG. 7, layer data description information in FIG. 15, NRT descriptor in FIG. The associated data description information of FIG. 18, and the file attribute description information of FIG. 18 can be parsed.

Meanwhile, the file uploaded by the storage control unit 150 is stored in the temporary storage unit 155 and output to the second switching unit 220.

The temporary storage unit 155 may temporarily store the content transmitted in the non-real time for easy uploading. In particular, the temporary storage unit 155 refers to the layer data description information, the NRT descriptor, or associated data description information in the case where the content transmitted in the non-real time is uploaded without sufficient time in the storage unit 160, Content can be cached.

The second switching unit 220 may selectively output a non-real-time content file uploaded by the storage control unit 150 or a packet output by the file processing unit 180. [ For example, the second switching unit 220 may transmit base layer data and enhancement layer data related to each other to combine base layer data and enhancement layer data using layer data description information, NRT descriptor, and associated data description information, And output it

The A / V decoding unit 230 may decode the A / V data included in the stream or the file selectively outputted by the second switching unit 220 and display the decoded A / V data. For example, the A / V decoding unit 230 decodes base layer (enhancement layer) data transmitted in real time and enhancement layer (base layer) transmitted in non-real time to output high quality video / audio data have.

The control unit 310 may control the component blocks of the broadcast signal receiving apparatus and may operate middleware or the like for providing a broadcast service. 15, the NRT descriptor of FIG. 16, the associated data description information of FIG. 17, and the file of FIG. 18, which are decoded by the broadcast technology information decoding unit 200, Quality content transmitted in real time or in non-real time according to the attribute description information can be controlled to be displayed.

According to the embodiment of the present invention, high quality content can be prevented from being reproduced or reproduced according to whether some data of non-real time transmitted content is stored.

According to an embodiment of the present invention, information describing base layer or enhancement layer data transmitted in non-real time and real time data related thereto can be described.

According to embodiments of the present invention, non-real-time data and real-time data related thereto can be combined to obtain high-quality content only by an authorized user.

Claims (6)

A broadcast signal receiving method for a broadcast receiving apparatus,
The method comprising: receiving first encoded data description information describing first encoded data included in a broadcast service, wherein the broadcast service further comprises second encoded data;
Receiving the file including the first encoded data in non-real time according to the first encoded data description information; And
Displaying the broadcast service using both the first encoded data received in the non-real time and the second encoded data received in real time;
Lt; / RTI >
Wherein the first encoded data description information includes size information for identifying a size of content included in the first encoded data. 2. The method of claim 1, wherein the first encoded data description information comprises:
And location information for identifying a location where the content can be obtained. 2. The method of claim 1, wherein the first encoded data description information comprises:
Further comprising type information for identifying a type of the first encoded data. Receiving first encoded data description information describing first encoded data included in a broadcast service, receiving a file including the first encoded data in non-real time according to the first encoded data description information, A receiving unit for receiving second encoded data included in real time; And
A control unit for presenting the broadcast service using both the first encoded data received in the non-real time and the second encoded data received in the real time;
Lt; / RTI >
Wherein the first encoded data description information includes size information that identifies a size of content included in the first encoded data. 5. The method of claim 4, wherein the first encoded data description information comprises:
Further comprising position information for identifying a position at which the content can be obtained. 5. The method of claim 4, wherein the first encoded data description information comprises:
And type information for identifying the type of the first encoded data.

Images