Method of transmitting and receiving digital broadcasting signal and reception system

[0046] First embodiment

[0047] FIG. 1 is a view schematically showing FIC and MSC of a digital broadcast signal according to an embodiment of the present invention.

[0048] In the following, a method of transmitting more audio services in the MSC will be schematically described with reference to FIG. 1. The implementation method according to the present invention can be understood through the second to sixth embodiments.

[0049] As shown in Figure 1, in the present invention, audio services compressed using a masked adaptive universal subband integrated coding and multiplexing (MUSICAM) audio coding method and some audio compressed using alternative audio coding methods can be transmitted in the MSC service.

[0050] For ease of description, in the present invention, the audio service compressed using the MUSICAM audio coding method is called MUSICAM audio (MA), and the audio service compressed using the alternative audio coding method is called alternative audio (AA).

[0051] The MSC indicates the channel used to transmit audio service components and data service components. The MSC is a data channel divided into multiple coded sub-channels. Each sub-channel transmits one or more service components. Here, the organization of sub-channels and service components is called multiplexing configuration.

[0052]The alternative audio coding method may be an advanced audio coding (AAC) method or a bit slice arithmetic coding (BSAC) method. Compared with the case of transmitting audio services compressed only using the MUSICAM audio coding method, in the case of using the AAC method or the BSAC method, more audio services can be provided.

[0053] In the present invention, the alternative audio coding method may also be the Band Copy (SBR) method or the Surround Motion Picture Experts Group (MPEG) method.

[0054] For example, conventionally, one DMB service and three audio services compressed using the MISICAM audio coding method can be transmitted in a frequency band of 1.5 MHz. However, in the present invention, one DMB service compressed using the MUSICAM audio coding method, one audio service, and three or four audio services compressed using an alternative audio coding method can be transmitted in the 1.5 MHz frequency band.

[0055] As a result, since one or two audio services can be further transmitted in the present invention, the broadcasting station can improve the audio service transmission efficiency, and the user can have the opportunity to select more audio services.

[0056] As described above, new information must be added to the FIC so that the broadcast receiver decodes and outputs audio services compressed using alternative audio coding methods.

[0057] The FIC that is changed by adding new information will be described in detail in the third and fourth embodiments.

[0058] FIC indicates a channel that allows broadcasting receivers to quickly acquire various information related to digital audio broadcasting. For example, FIC is used to transmit composite structure information (MCI) and service information (SI).

[0059] In order to facilitate the understanding of the third and fourth embodiments, the basic concept of FIC will be described in the second embodiment.

[0060] Second embodiment

[0061] FIG. 2 is a view showing the structure of a fast information block (FIB) of digital broadcasting.

[0062] FIG. 3 is a view showing the structure of a fast information group (FIG) in the FIB.

[0063] FIG. 4 is a view showing the service organization when the FIG type is 0 and the extension field is 2.

[0064] Hereinafter, the concepts of FIC, FIB, and FIG will be briefly described with reference to FIGS. 2 to 4 (together with FIG. 1).

[0065] FIC includes FIB.

[0066] As shown in Figure 2, FIB has 256 bits and includes FIB data field and cyclic redundancy check (CRC).

[0067] The FIB data field includes one or more FIGs, end tags, and padding.

[0068] Each FIG includes a FIG header and a FIG data field, and the FIG header includes the FIG type and length.

[0069] When the FIG type is 0, the FIG application can indicate information about MCI and SI.

[0070] When the FIG type is 0, the FIG data field includes current/next (C/N) field, other ensemble (OE) field, program/data (P/D) field, extension field, etc.

[0071] When the FIG type is 0, the extension field can be defined by 32 different usages.

[0072] For example, when the FIG type is 0 and the extension field has a value of 2, the basic service organization is defined.

[0073] That is, in the FIC, the FIG type 0 is used to transmit the MCI that informs the assembly structure, service structure, and information of the business component.

[0074] Figure 4 shows the structure of MCI information when the extension is 2 and the FIG type is 0.

[0075] Figure 4 shows information about N services. Each service includes a service identifier (SId) field, a local flag field, a conditional access identifier (CAId) field, a number of business components field, and k business component description fields.

[0076] Here, depending on whether the current service is a program service (for example, radio) or a data service (for example, TV or data), the number of bits of the SId field changes.

[0077] For example, in the case of a program service (ie, in a case where the P/D field has a value of 0), the SId field has 16 bits and includes a 4-bit country identifier field and a 12-bit service reference field. In the case of data services (ie, in the case where the P/D field has a value of 1), the SId field has 32 bits and includes an 8-bit extended country code (ECC) field, a 4-bit country identifier field, and a 20-bit service reference Field.

[0078] The local flag field indicates whether the transmitted service can be used only in a specific area served by a specific assembly or can be used in all areas.

[0079] The CAId field is used to identify the access control system (ACS) used for the transmitted service.

[0080] The number of service components field is used to identify the number of service components related to the transmitted service.

[0081] Each service component description field has 16 bits and includes a TMId field in the upper two bits, and the TMId field is used to indicate the type of broadcast service according to the transmission mode. The field assigned to the lower 14 bits and its value can vary according to the value of the TMId field.

[0082] For example, when the TMId field has the value "00", the TMId field indicates the MSC streaming audio mode, and when the TMId field has the value "01", the TMId field indicates the MSC streaming data mode. When the TMId field has the value "10", the TMId field indicates the FIC Data Channel (FIDC) mode, and when the TMId field has the value "11", the TMId field indicates the packet mode.

[0083] When the TMId field has the value "00", the audio service component type (ASCTy) field, the subchannel identifier (SubchId) field, the primary/secondary (P/S) field, and the conditional access (CA) flag field are assigned to the lower 14 Bit.

[0084] Although the case where the TMId field has the value "00" is described in the present invention, the present invention can also be applied to the case where the TMId field has other values.

[0085] That is, even when another alternative encoding method is used to encode or compress and transmit a video service component or a data service component, the broadcast receiver according to the present invention can decode the component.

[0086] The ASCTy field indicates the type of audio service component.

[0087] The SubChId field is used to identify the subchannel used to transmit service components.

[0088] The P/S field indicates whether the transmitted service component is a main component or an auxiliary component.

[0089] The CA flag field indicates whether access control is applied to the transmitted service component.

[0090] The third embodiment

[0091] According to an embodiment of the present invention, the alternative coding information of the currently transmitted audio service component is defined in the ASCTy field. The ASCTy field is transferred to the FIC of the transmission frame and the actual audio service component is transferred to the MSC.

[0092] That is, the value assigned to the ASCTy field can be used to confirm an alternative audio coding method for the audio service component transmitted through the MSC.

[0093] The ASCTy field indicates a value for identifying an audio service component coded using the MUSICAM audio coding method or another coding method.

[0094] Therefore, the broadcast receiver can decode audio service components compressed and transmitted using various encoding methods by parsing the ASCTy field.

[0095] FIG. 5 is a view showing the value of the ASCTy field according to an embodiment of the present invention.

[0096] FIG. 6 is a view showing the value of ASCTy according to another embodiment of the present invention.

[0097] FIG. 7 is a view showing the value of ASCTy according to another embodiment of the present invention.

[0098] According to an embodiment of the present invention, for example, by assigning a value such as 3, 4, or 5 to the ASCTy field instead of 0, 1, or 2, it can indicate that the audio service component is compressed using an alternative audio coding method instead of the MUSICAM method of.

[0099] The value of the ASCTy field is only exemplary and can be set to have other values.

[0100] 5 to 7 show various alternative audio coding methods and ASCTy fields allocated to the alternative audio coding methods.

[0101] Hereinafter, a method for encoding and transmitting audio services according to the present invention will be described with reference to FIGS. 5 to 7. According to the following embodiments of the present invention, the transmission method can be changed according to an alternative audio coding method.

[0102] As a first method, there is a method of transmitting service components compressed using multiple alternative audio coding methods through one sub-channel. Various alternative audio coding methods may include, for example, the AAC method, the SBR method, and the MPEG surround method. Alternatively, other audio coding methods can be used.

[0103] As shown in FIG. 5, for example, when the ASCTy field has a value of 3 (000011), it indicates that the service component foreground sound compressed using the AAC method, the SBR method, and the surround MPEG method is transmitted through one subchannel. The AAC method and the SBR method are collectively referred to as the High Efficiency Advanced Audio Coding (HE-AAC) method.

[0104] As shown in FIG. 5, when the ASCTy field has a value of 4 (000100), it indicates that the service component background sound compressed using the AAC method, the SBR method, and the MPEG surround method is transmitted through one subchannel.

[0105] As shown in FIG. 5, when the ASCTy field has a value of 5 (000101), it indicates that the service component multi-channel audio extension compressed using the AAC method, the SBR method, and the MPEG surround method is transmitted through one subchannel.

[0106] Here, the service component multi-channel audio extension may indicate additional information to have an upgraded audio effect. For example, the service component multi-channel audio extension may include information about implementing additional services (e.g., 5.1 channel audio services).

[0107]As a second scheme, there is a method of transmitting a service component compressed using a single alternative audio coding method through one subchannel. The alternative audio coding method may be the AAC method, the SBR method, or the MPEG surround method. Alternatively, other audio coding methods can be used. The solution indicates: when it is assumed that the audio service components are compressed using the AAC method and the SBR method respectively, the audio service components compressed using the AAC method and the audio service components compressed using the SBR method can be transmitted through the corresponding sub-channels.

[0108] As shown in FIG. 6, for example, when the ASCTy field has a value of 3 (000011), it indicates that the service component foreground sound compressed using the AAC method is transmitted through one sub-channel.

[0109] As shown in FIG. 6, when the ASCTy field has a value of 4 (000100), it indicates that the background sound of the service component compressed using the SBR method is transmitted through one subchannel.

[0110] As shown in FIG. 6, when the ASCTy field has a value of 5 (000101), it indicates that the service component multi-channel audio extension compressed using the surround MPEG method is transmitted through one sub-channel.

[0111] As a third scheme, there is a method of transmitting a part of a service component compressed using multiple alternative audio coding methods through one subchannel and transmitting another part through another subchannel. For example, the service component compressed using the AAC method and the SBR method may be transmitted through one subchannel, and the service component compressed using the surround MPEG method may be transmitted through another subchannel. The scheme indicates: when it is assumed that the audio service components are compressed using the AAC method, the SBR method and the MPEG surround method, the audio service components compressed using the AAC method and the SBR method can be transmitted through one sub-channel, and the audio service components compressed using the AAC method and the SBR method can be transmitted through another sub-channel Audio service components compressed using the surround MPEG method.

[0112] As shown in FIG. 7, for example, when the ASCTy field has a value of 3 (000011), it indicates that the foreground sound of the service component compressed using the AAC method and the SBR method is transmitted through one subchannel. The AAC method and the SBR method together are referred to as the High Efficiency Advanced Audio Coding (HE-AAC) method.

[0113] As shown in FIG. 7, when the ASCTy field has a value of 4 (000100), it indicates that the background sound of the service component compressed using the AAC method and the SBR method is transmitted through one subchannel.

[0114] As shown in FIG. 7, when the ASCTy field has a value of 5 (000101), it indicates that the service component multi-channel audio extension compressed using the surround MPEG method is transmitted through one sub-channel.

[0115] As shown in Figures 5 to 7, when the ASCTy field has a value of 63 (111111), it indicates that at least one service component is transmitted in the MPEG-2 transport stream. Here, the value 63 (111111) is only exemplary and another value may be used.

[0116] The at least one service component may include at least one of an audio service component, an A/V service component, and a data service component.

[0117] That is, the present invention is characterized in that the A/V service component and the data service component can also be defined in the ASCTy field and transmitted through the digital broadcast signal.

[0118] In the fourth embodiment, the process of decoding service components compressed using the above method will be described.