Patent ID: 7701850

Claim:
A digital broadcast transmitter, comprising: a pre-processor pre-processing traffic information data, wherein the traffic information data are included in a first data group, the first data group being before reordering a second data group, the first data group further including known data in advance known to a digital broadcast receiver and a transmitter which is inserted continuously and periodically, the second data group having at least one segment, an end of respective segment in the second data group corresponding to MPEG header data; a multiplexer multiplexing the traffic information data packet with one or more main audio and video (AV) data packets; a trellis encoder having at least one memory and trellis-encoding the multiplexed data packets, the at least one memory being initialized by initialization data when data outputted from the multiplexer 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, wherein the traffic information data include tendency information on traffic congestion information and the tendency information corresponds to a value indicating one of improved, deteriorated, constant, and unknown state for a link in the location information.