Patent ID: 8027369

Claim:
A digital broadcast transmitter, comprising: a pre-processor pre-processing traffic information data including the traffic information message, the pre-processor comprising: an RS frame encoder encoding the traffic information data using a Reed-Solomon scheme; a block-processor encoding the RS-encoded traffic information data at a coding rate of ½ or ¼; a group forming unit forming a data group including the encoded traffic information data and known data; a data de-interleaver de-interleaving data in the data group; and a packet formatter forming traffic information data packets including the de-interleaved data; a multiplexer multiplexing the traffic information data packets with one or more main audio and video (AV) data packets; an encoder performing systematic RS encoding on the main audio and video data packets and non-systematic RS encoding on the traffic information data packets; an interleaver interleaving data in the systematic RS-encoded main audio and video data packets and the non-systematic RS encoded traffic information data packets; a trellis encoder having at least one memory and trellis-encoding the interleaved data, the at least one memory being initialized by initialization data when the interleaved data correspond to a beginning of a known data sequence; and a data transmission unit inserting synchronization data into the trellis-encoded data, modulating the trellis-encoded data having the synchronization data, and transmitting the modulated data.