Patent ID: 7934145

Claim:
A digital television (DTV) transmitting system for processing digital broadcast data, the system comprising: an RS frame encoder for generating an RS frame by adding RS parity bytes and cyclic redundancy check (CRC) bytes to enhanced data; a block processor for encoding the CRC encoded enhanced data with a coding rate of 1/H, where H is an integer greater than 1; a group formatter for mapping the enhanced data encoded with the coding rate of 1/H into a first data region of a data group and adding regularly spaced known data sequences and signaling information into the first data region; a trellis encoder for trellis encoding the data group; and a transmitting unit for modulating the trellis-encoded data group and transmitting the modulated data group to one or more DTV receiving systems, wherein the modulated data group further includes a second data region comprising a plurality of data segments, wherein at least one of the data segments includes main and enhanced data and a total number of enhanced data bytes in an ith segment is different from a total number of enhanced data bytes in an (i+1)th segment.