| 摘要 |
A digital broadcasting system and a method for transmitting and receiving digital broadcast signal are disclosed. The method for processing a digital broadcast signal comprises processing the digital broadcast signal in at least two transmission modes, wherein the processing comprises first processing for a first transmission mode comprising forming a data group including mobile service data and place holder data for main service data, an MPEG-2 header and non-systematic RS parity data, removing the place holder data for main service data and non-systematic RS parity data in the data group, replacing the place holder data for the MPEG-2 header with an MPEG-2 header having a packet ID of mobile service data packets, thereby forming and outputting 118 mobile service data packets including data in the data group, multiplexing the outputted mobile service data packets and 38 main service data packets. Second processing for a second transmission mode of the processing comprises forming a data group including mobile service data, forming and outputting M numbers of mobile service data packets including data in the data group, wherein the M is an integer equal to or greater than 118 and equal to or less than 156, multiplexing the outputted mobile service data packets and N numbers of main service data packets when the N is not zero, wherein a sum of the M and N is 156 and transmitting the first and second processed digital broadcast signal.
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