Digital broadcasting receiving system and method of processing data

Abstract

A digital broadcasting receiving system and method is disclosed. In the data processing method, a known data sequence is tuned so as to be received, when the known data sequence is periodically inserted in valid data and transmitted. Then, the timing error is detected by using a correlation characteristic of the received known data sequence. Thereafter, a timing clock that is in proportion to the detected timing error is created, thereby interpolating the received data.

1 - 27 . (canceled) 
     
     
         28 . A method for transmitting a digital broadcast signal, the method comprising:
 encoding enhanced video and audio data for a second service to build a two-dimensional (2D) Reed-Solomon (RS) frame, the 2D RS frame including cyclic redundancy check (CRC) error flags in each row of the RS frame and RS parity bytes in each column of the RS frame;   forming data groups including the encoded enhanced data, wherein at least one of the data groups includes first, second and third regions, wherein the second region is located between the first and third regions;   forming data packets including data in the data groups;   multiplexing the data packets and main data packets having main video and audio data for a first service;   trellis encoding data of the multiplexed data packets; and   transmitting the digital broadcast signal including the trellis encoded data and known data symbol sequences that are training sequences, wherein the second region includes the enhanced data and the known data symbol sequences,   wherein the first and third regions include the enhanced data and the main data, and   wherein at least two of the known data symbol sequences are regularly spaced in the second region and at least one known data symbol sequence has a repeated pattern.   
     
     
         29 . The method of  claim 28  further comprising;
 block processing the encoded enhanced data with a specific code rate. 
 
     
     
         30 . An apparatus for transmitting a digital broadcast signal, the apparatus comprising:
 an encoder configured to encode enhanced video and audio data for a second service to build a two-dimensional (2D) Reed-Solomon (RS) frame, the 2D RS frame including cyclic redundancy check (CRC) error flags in each row of the RS frame and RS parity bytes in each column of the RS frame;   a group formatter configured to form data groups including the encoded enhanced data, wherein at least one of the data groups includes first, second and third regions, wherein the second region is located between the first and third regions;   a packet formatter configured to form data packets including data in the data groups;   a multiplexer configured to multiplex the data packets and main data packets having main video and audio data for a first service;   a trellis encoder configured to trellis encode data of the multiplexed data packets; and   a transmission unit configured to transmit the digital broadcast signal including the trellis encoded data and known data symbol sequences that are training sequences,   wherein the second region includes the enhanced data and the known data symbol sequences,   wherein the first and third regions include the enhanced data and the main data, and   wherein at least two of the known data symbol sequences are regularly spaced in the second region and at least one known data symbol sequence has a repeated pattern.   
     
     
         31 . The apparatus of  claim 30 , further comprising;
 a block processor configured to block process the encoded enhanced data with a specific code rate.