Patent ID: 7907635

Claim:
A digital broadcast transmitter, comprising: a pre-processor configured to pre-process enhanced data, the enhanced data being included in a first data group having known data, wherein the pre-processor further configured to de-interleave the first data group to output a second data group, each packet of both the first data group and the second data group consisting of 207 bytes, the first segment and the last segment in the first data group having RS parity data; a multiplexer configured to multiplex the enhanced data with one or more main audio and video data; a post-processor configured to post-process the multiplexed data by encoding only the enhanced data included in the multiplexed data with a coding rate of G/H, wherein G and H are positive integers and G is less than H; a data encoding and interleaving unit configured to add first parity data into the post-processed data and interleave the post-processed data having the first parity data; a trellis encoder configured to have at least one memory and trellis-encode the interleaved data, the at least one memory being initialized by initialization data when data outputted from the data encoding and interleaving unit corresponds to a start of the known data; and a data transmission unit configured to insert synchronization data into the trellis-encoded data, modulate the trellis-encoded data having the synchronization data, and transmitting the modulated data, wherein the enhanced data includes a status information, which includes prediction information on a link travel time, and a traffic information message, which includes location information corresponding to the status information.