Patent ID: 8171369
Filing Date: 2012-05-01
Classification: H03M,H04N

Abstract:
1. A digital television (DTV) transmitting system for processing digital broadcast data, the DTV transmitting system comprising: a first randomizer for randomizing enhanced data; a Reed-Solomon (RS) frame encoder for generating an RS frame by adding RS parity data to bottom ends of columns of an RS frame payload and adding Cyclic Redundancy Check (CRC) data to right ends of rows of the RS frame payload having the RS parity data, the RS frame payload including the randomized enhanced data; a block processor for encoding a first data portion in the RS frame with a first coding rate and encoding a second data portion in the RS frame with a second coding rate; a group formatter for mapping the encoded first data portion into a first region of at least one data group, mapping the encoded second data portion into a second region of the at least one data group, and adding known data sequences, signaling information, RS parity data place holders, main data place holders and MPEG header data place holders to the at least one data group; a packet formatter for removing the RS parity data place holders and the main data place holders and replacing the MPEG header data place holders with MPEG header data in order to output enhanced data packets; a multiplexer for multiplexing the enhanced data packets with main data packets including main data; a second randomizer for randomizing the multiplexed main data packets and the MPEG header data in the multiplexed enhanced data packets; a trellis encoding unit for trellis encoding data of the randomized main data packets and data of the enhanced data packets having the randomized MPEG header data; and a transmitting unit for transmitting the trellis encoded data.