Patent ID: 8074152

Claim:
An apparatus for receiving a broadcast signal, the apparatus comprising: a receiving unit configured to receive the broadcast signal including a transmission frame comprising a parade of data groups, wherein each data group includes a plurality of regions comprising data blocks, wherein a first region includes four central data blocks, a second region includes two data blocks which are concentric about the first region, a third region includes two data blocks which are concentric about the first and second regions, and a fourth region includes two data blocks which are concentric about the first, second, and third regions, wherein the parade of data groups include mobile service data which constructs a primary Reed-Solomon (RS) frame or primary and secondary RS frames according to an RS Frame mode information, wherein the RS frame mode information indicates a single frame mode or a dual frame mode, and wherein the primary RS frame is built per the parade of data groups when the RS frame mode information indicates the single frame mode, and the primary and secondary RS frames are built per the parade of data groups when the RS frame mode information indicates the dual frame mode; a RS frame decoder configured to perform Cyclic Redundancy Checking (CRC) decoding and RS decoding on data located in the primary RS frame or the primary and secondary RS frames according to the RS frame mode information; and a decoder configured to decode audio data in an audio stream of the mobile service data according to Huffman table information.