Transmitting system and method of processing broadcast data in the transmitting system

Abstract

A method of processing broadcast data in a broadcast transmitting system includes Reed-Solomon (RS) encoding and cyclic redundancy check (CRC) encoding enhanced data bytes; converting the RS-CRC encoded enhanced data bytes into enhanced data bits; encoding each of the converted enhanced data bits with one of a first coding rate and a second coding rate, thereby outputting data symbols; first interleaving the data symbols; converting the first interleaved data symbols into data bytes; forming a first data group including enhanced data corresponding to the converted data bytes; deinterleaving data of the first data group; outputting enhanced data packets including the deinterleaved data of the first data group; multiplexing the enhanced data packets with main data packets including main data; second interleaving data of the multiplexed data packets; and trellis encoding the second interleaved data.

What is claimed is: 
     
       1. A method of processing broadcast data in a broadcast transmitting system, the method comprising:
 Reed-Solomon (RS) encoding and cyclic redundancy check (CRC) encoding enhanced data bytes; 
 converting the RS-CRC encoded enhanced data bytes into enhanced data bits; 
 encoding each of the converted enhanced data bits with one of a first coding rate and a second coding rate, thereby outputting data symbols; 
 first interleaving the data symbols; 
 converting the first interleaved data symbols into data bytes; 
 forming a first data group including enhanced data corresponding to the converted data bytes, wherein the first data group comprises regions A, B and C, wherein the region A is central, the region B is concentric about the region A, and the region C is concentric about the regions A and B, wherein the region A includes enhanced data encoded with the first coding rate and known data sequences, and wherein the regions B and C include enhanced data encoded with the second coding rate, but do not include known data sequences, and wherein the first coding rate is different from the second coding rate; 
 deinterleaving data of the first data group; 
 outputting enhanced data packets including the deinterleaved data of the first data group; 
 multiplexing the enhanced data packets with main data packets including main data; 
 second interleaving data of the multiplexed data packets; and 
 trellis encoding the second interleaved data in a trellis encoding unit. 
 
     
     
       2. The method of  claim 1 , further comprising RS encoding data of the multiplexed data packets and, thereby inserting RS parity data into the multiplexed data packets. 
     
     
       3. The method of  claim 1 , wherein the first coding rate is different from the second coding rate. 
     
     
       4. The method of  claim 1 , wherein the first coding rate is equal to the second coding rate. 
     
     
       5. The method of  claim 1 , wherein the first code rate is either ½ or ¼ and the second code rate is one of either ½ or ¼. 
     
     
       6. A broadcast transmitting system comprising:
 a Reed-Solomon (RS) frame encoder for RS encoding and cyclic redundancy check (CRC) encoding enhanced data bytes; 
 a block processor for converting the RS-CRC encoded enhanced data bytes into enhanced data bits, encoding each of the converted enhanced data bits with one of a first coding rate and a second coding rate and outputting data symbols, first interleaving the data symbols, and converting the first interleaved data symbols into data bytes; 
 a group formatting unit for forming a first data group including enhanced data corresponding to the converted data bytes, wherein the first data group comprises regions A, B and C, wherein the region A is central, the region B is concentric about the region A, and the region C is concentric about the regions A and B, wherein the region A includes enhanced data encoded with the first coding rate and known data sequences, and wherein the regions B and C include enhanced data encoded with the second coding rate, but do not include known data sequences, wherein the first coding rate is different from the second coding rate; 
 a deinterleaver for deinterleaving data of the first data group; 
 a packet formatter for outputting enhanced data packets including the deinterleaved data of the first data group; 
 a multiplexer for multiplexing the enhanced data packets with main data packets including main data; 
 an interleaver for second interleaving data of the multiplexed data packets; and 
 a trellis encoding unit for trellis encoding the second interleaved data. 
 
     
     
       7. The broadcast transmitting system of  claim 6 , further comprising an RS encoder for RS encoding data of the multiplexed data packets and, thereby inserting RS parity data into the multiplexed data packets. 
     
     
       8. The broadcast transmitting system of  claim 6 , wherein the first coding rate is different from the second coding rate. 
     
     
       9. The broadcast transmitting system of  claim 6 , wherein the first coding rate is equal to the second coding rate. 
     
     
       10. The broadcast transmitting system of  claim 6 , wherein the first code rate is either ½ or ¼ and the second code rate is one of either ½ or ¼. 
     
     
       11. The method of claim 1, further comprising:
 initializing at least one memory in the trellis encoding unit at a start of at least one of the known data sequences.   
     
     
       12. The broadcast transmitting system of claim 6, wherein the trellis encoding unit includes at least one memory, and wherein the at least one memory is initialized at a start of at least one of the known data sequences.