KR100710248B1 - Broadcasting receiver, method for discriminating broadcasting service, and data structure - Google Patents

Abstract

In the present invention, in addition to the mobile broadcast service, identification information for identifying whether the mobile broadcast service is audio service is transmitted through the FIC and / or the MSC so that the received broadcast service is broadcast Or whether it is a broadcasting service that is a main video. The results can also be applied to various fields such as a channel selection menu.

DMB, audio, classification

Description

TECHNICAL FIELD [0001] The present invention relates to a broadcast receiver, a broadcast service classification method, and a data structure,

1 is a diagram showing an example of an ensemble structure of a mobile broadcast service according to the present invention;

2 is a diagram showing a structure of a transmission frame of a mobile broadcast service according to the present invention;

3 is a view showing the detailed structure of each FIB shown in Fig. 2

4 is a diagram showing a structure of FIG type 0 extension 2 for information transmission according to the present invention;

5 is a diagram showing a PMT syntax structure for information transmission according to the present invention;

6 is a diagram showing an embodiment of a descriptor according to the present invention.

7 is a block diagram showing a configuration of a broadcast receiver according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast receiver, and more particularly, to a method and a data structure capable of distinguishing an audio broadcast in a mobile broadcast service.

Digital multimedia broadcasting (DMB) in mobile broadcasting is based on Eureka-147 Digital Audio Broadcasting (DAB) adopted as European terrestrial radio standard. That is, although the Eureka-147 is designed for digital audio broadcasting (DAB), it is also used as an underlying technology of a terrestrial DMB that provides a small screen size video using a narrow frequency bandwidth of 2 MHz.

In the DAB, the audio is compression-encoded using a MUSICAM (Masking Pattern) type adaptive sub-band integrated coding and multiplexing (MUSICAM) scheme. On the other hand, in the DMB, audio is compression-encoded using a BSAC (Bit Sliced Arithmetic Coding) method, and video is compression-encoded using H.264 / AVC (Advanced Video Coding) (MPEG-4 Part 10).

At this time, the broadcast may be only audio service using MUSICAM, or only audio service using BSAC. BSAC and H.264 can also be used for audio and video services.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a broadcast receiver, a demultiplexing method, and a data structure for enabling a mobile broadcasting service to distinguish whether or not an audio service is primarily used by inserting an identification descriptor into a transmission frame.

According to another aspect of the present invention, there is provided a method for classifying a broadcast service according to an embodiment of the present invention, which comprises the steps of: (a) determining whether the mobile broadcast service is a broadcast service in which audio is main, Including identification information including a descriptor describing a type of a mobile broadcast service; And (b) parsing the transmitted identification information to determine whether the transmitted mobile broadcast service is broadcast audio.

delete

delete

The method of classifying a broadcast service according to another embodiment of the present invention comprises the steps of: (a) identifying, in addition to a mobile broadcast service, identification information identifying whether the mobile broadcast service is a main broadcast audio service, Comprising: transmitting; And (b) parsing identification information from the transmitted FIC to determine whether the transmitted mobile broadcast service is broadcast audio.

delete

delete

In another aspect of the present invention, there is provided a method of classifying a broadcast service according to yet another aspect of the present invention, comprising the steps of: (a) transmitting, along with a mobile broadcast service, identification information for identifying whether the mobile broadcast service is a main broadcast audio service, Including the steps of: And (b) parsing identification information from the transmitted MSC to determine whether the transmitted mobile broadcast service is broadcast audio.

delete

delete

The program map table describing the unique information of each individual bit stream constituting the program according to the embodiment of the present invention is characterized by including a descriptor for describing the type of the mobile broadcast service.

The broadcast receiver according to an embodiment of the present invention includes a descriptor for describing a type of a mobile broadcast service so that the mobile broadcast service can distinguish whether the mobile broadcast service is a main broadcast audio service A broadcast receiver for receiving the identification information; A decoding unit decoding the received mobile broadcast service; And a controller for parsing the received identification information to determine whether the mobile broadcast service is broadcast audio.

Other objects, features and advantages of the present invention will become apparent from the detailed description of embodiments with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration and an operation of an embodiment of the present invention will be described with reference to the accompanying drawings, and the configuration and operation of the present invention shown in and described by the drawings will be described as at least one embodiment, The technical idea of the present invention and its essential structure and action are not limited.

In the present invention, to distinguish whether the transmitted mobile broadcast service is for audio main service, first, the main service defines an audio service.

That is, not only the audio broadcasting using the existing MUSICAM system but also the audio service is mainly used and the still service or interactive data broadcasting is included in addition to the audio service.

For example, a broadcasting service for additionally transmitting audio-only broadcasting service using BSAC, a broadcasting service for additionally transmitting low-speed video service such as slide to audio using BSAC, a broadcasting service for additionally transmitting interactive service to audio using BSAC , A broadcasting service for additionally transmitting a low-speed video service and an interactive service to audio using the BSAC.

Also, even though the video service using H.264 is included in the audio service, the broadcast service may be classified into a broadcast service that is mainly used for the audio service, depending on its weight. The broadcasting service in which the audio service is the main service may be changed according to the classification condition on the transmission side.

The broadcast service in which the audio service is the main service may be applied to a wider range of applications, so that the present invention is not limited to the above example.

In the present invention, the transmitting side includes identification information that can distinguish whether the audio service is a main broadcasting service, and transmits the identification information to various applications on the receiving side. For example, when the channel selection menu is displayed on the receiver side, the audio service can be applied to a case in which the broadcast channel in which the audio service is the main channel is displayed separately from the channel.

A method and a data structure for distinguishing whether a mobile broadcasting service is primarily aimed at an audio service will be described in the first and second embodiments.

1st Example

The DMB includes a DAB, and the DMB can service at least one ensemble in one physical channel frequency range.

FIG. 1 shows an example in which three ensembles of block A, block B, and block C are served in a frequency range corresponding to one analog TV channel (for example, channel 12).

At this time, each ensemble is composed of at least one service, and each service is again composed of at least one service component.

The service corresponds to one channel of TV or radio. The service element refers to video, audio, traffic information, or broadcast service information constituting a broadcast. The service element can be a sub-channel of an MSC (Main Service Channel) and a Fast Information Data Channel (FIDC).

Multiplex Configuration Information (MCI) is information indicating the services multiplexed in the ensemble, the service elements constituting each service, and where the service elements are located.

That is, the DMB transmission frame is composed of a synchronization channel, a fast information channel (FIC), and a main service channel (MSC) as shown in FIG.

The synchronization channel has a predetermined format to recognize that the DMB receiver is the initial frame, and a null symbol and a phase reference symbol (PRS) are allocated.

The FIC is composed of a plurality of FIBs (Fast Information Blocks), and is used to transmit various information for receiving a broadcasting service. In addition, the MSC includes at least one Common Interleaved Frame (CIF), and is used for transmitting a broadcasting service such as video, voice, and data.

In other words, the FIC includes information indicating the structure of data loaded in the CIF in the MSC, and each CIF contains actual data such as video data and audio data. The number of FIBs placed in the FIC and the number of CIFs placed in the MSC vary according to the transmission mode. For example, in transmission mode I, the FIC consists of 12 FIBs, and the MSC consists of 4 CIFs. Therefore, the DMB receiver can decode the data in CIF units to provide the user with video and audio services.

As described above, an MCI indicating a structure between an ensemble, a service, and a service element is transmitted through the FIC. The FIC includes a plurality of FIBs.

Each FIB is composed of a plurality of FIGs (Fast Information Groups) as shown in FIG. 3, and each FIG is divided into a FIG header and a FIG data field. At this time, the length of the FIG is variable but can not exceed 30 bytes including a header.

The FIG uses five types of eight available types. Each type of FIG can be extended by type. For example, in the case of FIG type 0, there are 32 possible extensions. Among them, 30 extensions are used. They are used for the configuration information of the ensemble, the content of the subchannel, the paging, and the like.

Table 1 below shows the types of information carried in accordance with the FIG type.

[Table 1]

FIG type number FIG type FIG application       0   000 MCI and part of SI       One   001 Labels, etc. (part of the SI)       2   010 Reserved       3   011 Reserved       4   100 Reserved       5   101 FIC Data Channel (FIDC)       6   110 Conditional Access (CA)       7   111 In house (expert for Length 31)

In Table 1, the MCI indicating the structure of the ensemble and each service and the service element information is Type 0, the other SI (Service Information) is Type 1, the FIDC is Type 5, and the CA (Conditional Access) .

That is, the MCI that informs the structure of the ensemble, each service structure, and information related to the service element is transmitted in Type 0 of FIG in the FIC.

In the first embodiment of the present invention, the transmission type mobile service is included in the type 0 of the FIG to transmit whether or not the audio service is the main broadcasting service. In particular, the first embodiment of the present invention is to transmit whether the transmitted mobile broadcast service is included in the FIG type 0 extension 2 of the FIG type 0 whether or not the broadcast service is a mainstream audio service.

FIG. 4 is a diagram showing the structure of FIG type 0 / extension 2 (FIG type 0 for extension 2) among the MCI information.

4, information on a plurality of services is shown. Each service includes a service ID (SId), a conditional access identifier (CAId), a number of service elements, and k service element descriptions service component description) field.

16 bits are assigned to each service element description field. The TMId field indicating the type of the broadcasting service according to the transmission mode is allocated to the upper 2 bits of the service element description field, and the TMId field is allocated to the lower 14 bits according to the TMId field value. The fields and their values are different.

For example, if TMId is 00, the corresponding service element loaded on the MSC means an audio-only broadcast service using a DAB service, that is, MUSICAM (MSC stream audio), and if TMId is 01, it means MSC stream data . If TMId is 10, data is loaded in FIC instead of MSC because FIDC, and if TMId is 11, packet data is loaded.

If the TMId field value is 01, that is, the DMB data, the lower 14 bits are composed of a DSCTy field, a subchannel ID field, a Primary / Secondary (P / S) field, and a CA (Conditional Access) flag field.

At this time, if the DSCTy field value is 011000, the corresponding service element data loaded on the MSC means a stream conforming to the terrestrial digital radio transmission / reception matching standard. That is, it means DMB service using BSAC and H.264.

However, this alone does not know whether the DMB service is a broadcasting service that is mainly audio service or a broadcasting service that is a mainstream video service.

Therefore, in the first embodiment of the present invention, a plurality of values are assigned to the DSCTy field, and the DMB service type can be identified by the value.

For example, 011001 is allocated to the DSCTy field value if the audio service is a main broadcasting service, and 011000 is allocated if the video service is a main broadcasting service.

The audio service includes an audio-only broadcasting service using BSAC, a broadcasting service for additionally transmitting a low-speed video service such as a slide to audio using BSAC, an interactive service for audio using BSAC, A broadcasting service for additionally transmitting a low-speed video service and an interactive service to audio using the BSAC, and the like. That is, the present invention is also applicable to a case where a low-speed moving picture, a still picture or an interactive data broadcast is included in addition to the audio service while the audio service is mainly used.

The type of DMB service that can be distinguished according to the value assigned to the DSCTy field is also different.

According to an embodiment of the present invention, it is possible to distinguish whether the currently transmitted DMB service is a broadcasting service in which an audio service is a main service.

As described above, in the first embodiment of the present invention, the FIC in the transmission frame includes information capable of distinguishing whether the transmitted mobile broadcasting service is a broadcasting service in which audio is the main broadcasting service.

Second Example

On the other hand, the audio and / or video data compression-encoded in the BSAC and / or H.264 format on the transmitting side is packetized into the PES format and then divided into a plurality of MPEG-2 TS packets having a fixed length and transmitted through the MSC .

Since the MPEG-2 TS transmits a plurality of video and audio individual bit streams, it is necessary to select which program from among a plurality of programs, which packet is to be taken and how to decode it. That is, in the decoding of the MPEG-2 TS, one of a plurality of programs must be selected and then the packet identification number (PID) of the transport packet of the individual bit stream necessary for decoding of the program must be known. Then, the parameter information and linkage information of these individual bit streams must be known. A plurality of additional information (PSI) tables are required for such a multi-step operation.

A PAT (Program Association Table) among the plurality of tables is special information transmitted by a packet having PID = 0. That is, the PAT describes the components of the program for each program number, and indicates the PID of the transport packet for transmitting the program map table (PMT).

The program map table (PMT) describes a program identification number and a PID list and associated information of a transport packet in which individual bit streams such as video and audio constituting a program are transmitted. That is, the role of the PMT in the MPEG-2 TS is to transmit information about which PID the ES (elementary streams) necessary for forming one program are transmitted.

In the second embodiment of the present invention, a new descriptor (DMB_ServiceType descriptor) is added to the MPEG-2 TS layer, and the type of the mobile broadcast service is displayed on the descriptor. The descriptor includes information that can identify whether the current mobile broadcast service is a broadcast service in which audio is the mainstream.

In particular, the second embodiment of the present invention is characterized in that the descriptor (DMB_ServiceType descriptor) is included in the PMT and is transmitted.

FIG. 5 shows an embodiment of a PMT syntax structure applied to the present invention. FIG. 6 shows an embodiment of a syntax structure of a descriptor (DMB_ServiceType descriptor) included in the PMT, As an embodiment. That is, the first loop of the PMT includes the descriptor (DMB_ServiceType descriptor).

Descriptions of the respective fields of the PMT syntax are described in 13818-1 2.4.4.

If audio and / or video compression-coded in MPEG-4 is packetized into MPEG2 TS, the above-mentioned PMT syntax may include an IOD descriptor defined in MPEG-4 and an SL (Sync Layer) descriptor. In this case, the IOD descriptor is included in the descriptor () area in the first loop, and the SL_descriptor is included in the descriptor () area in the second loop.

In the present invention, the DMB_ServiceType descriptor capable of identifying the type of the broadcast service is included in the first loop, but may be included in the second loop.

The structure of the descriptor (DMB_ServiceType descriptor) capable of identifying the broadcast service type includes a descriptor_tag field, a descriptor_length field, and a DMB_service_type field as shown in FIG.

And each 8 bits is allocated to each field.

The Descriptor_tag field value may be assigned an ID that is not currently used or a value corresponding to a user private.

And the identification information for identifying the actual broadcast service type is displayed in the DMB_service_type field. The definition of the field value is determined by the promise of the transmitting / receiving side.

For example, if the value of the DMB_service_type field is 0x00, it indicates that the video service is broadcast in accordance with the standard of the digital radio video transmission and reception, and if it is 0x01, the audio service is the main broadcast. 0x02 ~ 0xFF are reserved for future use. That is, the above values may be used depending on the number of types of broadcasting to be separated.

As described above, in the second embodiment of the present invention, information that can distinguish whether a mobile broadcasting service to be transmitted is a broadcasting service to which audio is mainly transmitted is transmitted through an MSC in a transmission frame. Specifically, a descriptor for displaying identification information is newly allocated, and the allocated descriptor is included in the PMT in the MSC and transmitted.

FIG. 7 is a block diagram of a broadcast receiver according to the first and second embodiments of the present invention. Referring to FIG. 7, a broadcast receiver, an FIC decoder, an MSC decoder, an MPEG-2 system decoder, And a control unit.

That is, the broadcast receiver receives the mobile broadcast service, outputs the FIC information in the transmission frame to the FIC decoder, and outputs the MSC information to the MSC decoder.

If the identification information capable of distinguishing the broadcasting service is transmitted through the FIC as in the first embodiment, the identification information is extracted through the FIC decoder and the control unit. If the identification information is transmitted through the MSC as in the second embodiment, And extracts the identification information through the system decoder and the control unit. That is, the FIC decoder parses the DSCTy field value shown in the FIG type 0 / extension 2 and delivers the DSCTy field value to the controller. Based on the data, the controller determines whether the received mobile broadcasting service is the audio service. The MSC decoder also decodes the MSC information and outputs it to the MPEG-2 system decoder in MPEG-2 TS format. The MPEG-2 system decoder parses the PMT if a descriptor (DMB_ServiceType descriptor) is included in the PMT, and transmits the parsed DMB_ServiceType descriptor to the controller. The controller decides whether the received mobile broadcasting service is based on the DMB_service_type field value in the descriptor, .

The determination result may be applied when configuring the channel selection menu. The application example is an embodiment, and the result of the determination may be variously applied, so that the present invention is not limited thereto.

As described above, according to the present invention, it is possible to insert an identification descriptor into a transmission frame in which the current mobile broadcasting service can recognize whether the current broadcasting service is audio, / Or the MSC, the receiving side can easily distinguish whether the received broadcasting service is a broadcasting service in which audio is a mainstay or a broadcasting service in which video is a mainstay.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments but should be determined according to the claims.

Claims (21)

(a) including identification information including a descriptor for describing a type of a mobile broadcast service so that the mobile broadcast service can distinguish whether the mobile broadcast service is a main broadcast audio service; And and (b) parsing the transmitted identification information to determine whether the transmitted mobile broadcast service is broadcast audio. The method according to claim 1, Wherein the identification information is included in the FIC of the transmission frame in the step (a). The method according to claim 2, wherein Wherein the identification information is included in the FIG type 0 extension 2 in the MCI of the FIC and is transmitted in step (a). The method of claim 3, Wherein the identification information is transmitted in a DSCTy field of a stream data mode in each service element descriptor field of FIG type 0 / extension 2 (FIG. 0 for extension 2) in step (a) Way. The method according to claim 1, Wherein the identification information is included in an MSC in a transmission frame in step (a). 6. The method of claim 5, Wherein the identification information is included in the PMT in the MSC in step (a). The method according to claim 6, Wherein the identification information is transmitted in a descriptor allocated to a first loop in the PMT in step (a). The method of claim 1, wherein the audio service is a broadcast service An audio only broadcasting service using BSAC, a broadcasting service for additionally transmitting a low-speed video service such as a slide to audio using BSAC, a broadcasting service for additionally transmitting interactive service to audio using BSAC, audio using BSAC And a broadcast service for additionally transmitting a low-speed video service and an interactive service to the broadcast service. (a) including in the FIC in the transmission frame identification information capable of distinguishing whether the mobile broadcasting service is a main broadcasting service with the mobile broadcasting service; And (b) parsing identification information from the transmitted FIC to determine whether the transmitted mobile broadcast service is broadcast audio. 10. The method of claim 9, Wherein the identification information is included in the FIG type 0 extension 2 in the MCI of the FIC and is transmitted in step (a). 11. The method of claim 10, Wherein the identification information is transmitted in the DSCTy field of the stream data mode in each service element descriptor field of the FIG type 0 / extension 2 (FIG type 0 for extension 2) in the step (a) . (a) transmitting, together with a mobile broadcast service, identification information that can distinguish whether the mobile broadcast service is a main broadcast audio service, in an MSC in a transmission frame; And (b) parsing the identification information from the transmitted MSC to determine whether the transmitted mobile broadcast service is broadcast audio. 13. The method of claim 12, Wherein the identification information is included in the PMT in the MSC in step (a). 14. The method of claim 13, Wherein the identification information is transmitted in a descriptor allocated to a first loop in the PMT in step (a). Wherein the program map table describing the unique information of each individual bit stream constituting the program includes a descriptor for describing the type of the mobile broadcast service. 16. The apparatus of claim 15, wherein the descriptor And a field for indicating whether the mobile broadcast service is a broadcast service whose audio is main. A broadcast receiver for receiving identification information including a descriptor for describing a type of a mobile broadcast service so that the mobile broadcast service can distinguish whether the mobile broadcast service is a main broadcast audio service; A decoding unit decoding the received mobile broadcast service; And And parsing the received identification information to determine whether the mobile broadcast service is broadcast audio. 18. The apparatus of claim 17, wherein the control unit Wherein the identification information is extracted by parsing the FIG type 0 / extension 2 (FIG type 0 for extension 2) in the MCI of the FIC in the transmission frame. 19. The apparatus of claim 18, wherein the controller And parses the DSCTy field of the stream data mode in each service element descriptor field of the FIG type 0 / extension 2 (FIG type 0 for extension 2) to extract the identification information. 18. The apparatus of claim 17, wherein the control unit And parses the PMT of the MSC in the transmission frame to extract the identification information. 21. The apparatus of claim 20, wherein the control unit And parses the descriptor assigned to the first loop in the PMT to extract the identification information.

Images