Patent ID: 7712124

Claim:
A method of processing digital broadcast data, the method comprising: demodulating a digital television (DTV) signal containing additional service data multiplexed with data for a digital television receiver, wherein the additional service data result from pre-processing original additional service data before multiplexing with the data for the digital television receiver by coding the original additional service data for first forward error correction (FEC) and periodically inserting predefined data into the coded additional service data, wherein the additional service data further result from coding the pre-processed additional service data for second FEC and interleaving the second FEC coded additional service data; detecting signaling information from the demodulated DTV signal; decoding the additional service data in the demodulated DTV signal for the first FEC in order to correct errors in the additional service data that occurred during reception of the DTV signal; separating the additional service data from the data for the digital television receiver; reordering the error-corrected additional service data; and decoding the reordered additional service data for the second FEC in order to additionally correct errors in the additional service data that occurred during reception of the DTV signal.