Trellis encoder and trellis encoding device having the same

A digital broadcast encoder comprising:

• a transport stream generator to generate a transport stream to be transmitted to a receiver;
• a randomizer to randomize the transport stream;
• a supplementary reference signal (SRS) stuffer to insert a supplemental reference signal (SRS) into an insertion region provided in the transport stream;
• a Reed-Solomon (RS) encoder to encode the transport stream into which the SRS is inserted;
• an interleaver to interleave the transport stream encoded by the RS encoder;
• and
• a trellis encoding device to trellis encode the interleaved transport stream,
• wherein the trellis encoding device comprises:
• a plurality of trellis encoders to perform the trellis-encoding of the transport stream into which the supplementary reference signal (SRS) has been inserted at the insertion region, and memories included in the plurality of trellis encoders are reset before processing the transport stream at the insertion region into which the SRS has been inserted so as to remove a DC offset caused by the SRS.