Patent ID: 7720062

Claim:
A digital broadcast transmitter, comprising: a pre-processor configured to pre-process traffic information data, wherein the traffic information data are included in a data group comprising known data in advance known to the receiver and a digital broadcast transmitter, the known data inserted continuously and periodically in the data group, the data group divided into at least two areas, one area of them having main data and the traffic information data able to be coded at a first code rate, and another area of them having the traffic information data able to be coded at a second code rate lower than the first code rate; a multiplexer configured to multiplex the traffic information data with one or more main audio and video (AV) data; a trellis encoder configured to have at least one memory and trellis-code the multiplexed data, the at least one memory being initialized by initialization data when data outputted from the multiplexer correspond to a beginning of a sequence 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 transmit the modulated data, wherein the traffic information data include at least one of road change information and traffic route shape information.