Digital broadcast transmitter/receiver having an improved receiving performance and signal processing method thereof

A signal processing method for a digital broadcast transmitter, comprising:

• randomizing a transport stream into a specified position of which stuff bytes are inserted;
• replacing the stuff bytes in the randomized data with specified known data;
• Reed-Solomon (RS) encoding of data having the replaced stuff bytes to add a parity to the data;
• interleaving the RS encoded data;
• performing a trellis encoding of the interleaved data;
• generating another parity for the data changed according to a memory initialization in the trellis encoding, and outputting the generated another parity for use in the trellis encoding;
• and
• modulating the trellis encoded data and performing an RF up-conversion of the modulated data,
• wherein:
• the trellis encoding comprises replacing the parity added in the RS encoding with the another parity generated in the generating of the another parity, and
• the specified known data has a feature that after the specified known data is trellis encoded, the output specified known data has a spectrum similar to that of pseudo noise and has an average DC (direct current) value close to 0.

A digital broadcast transmitter comprising:

• a randomizer to randomize a transport stream into a specified position of which stuff bytes are inserted;
• a stuff-byte exchanger to replace the stuff bytes included in data output from the randomizer with specified known data known by a corresponding receiver;
• a Reed-Solomon (RS) encoder to perform an RS-encoding of data output from the stuff-byte exchanger to add a parity to the data;
• an interleaver to interleave data output from the RS encoder;
• a trellis encoder including a memory to perform a memory initialization with respect to data input in a position into which the stuff bytes are inserted, and to perform a trellis encoding of data output from the interleaver;
• an RS parity generator to receive a value for initializing the memory, to generate another parity, and to output the generated another parity to the trellis encoder for use in the trellis encoding;
• and
• a modulator/RF converter to modulate data output from the trellis encoder and to perform an RF up-converting of the modulated data,
• wherein the specified known data has a feature that after the specified known data pass through the trellis encoder, the output specified known data has a spectrum similar to that of pseudo noise and has an average DC (direct current) value close to 0.

A signal processing method for a digital broadcast transmitter, comprising:

• randomizing a transport stream into a specified position of which stuff bytes are inserted;
• replacing the stuff bytes in randomized data resulting from the randomization with specified known data;
• performing a Reed-Solomon (RS) encoding of data output in the stuff-byte replacing to add a parity to the data;
• interleaving data resulting from the RS encoding;
• performing a trellis encoding of the interleaved data and performing a memory initialization with respect to data input in a position into which the stuff bytes are inserted;
• performing RS parity generation by receiving a value for initializing the memory, generating another parity, and outputting the generated another parity for use in the trellis encoding;
• and
• modulating trellis encoded data and performing an RF up-converting of the modulated data,
• wherein the specified known data has a feature that after the specified known data is trellis encoded, the output specified known data has a spectrum similar to that of pseudo noise and has an average DC (direct current) value close to 0.

A digital broadcast receiver, comprising:

• a tuner to receive a stream;
• a demodulator to demodulate the received stream;
• and
• an equalizer to equalize the demodulated stream,
• wherein the received stream is transmitted from a digital broadcast transmitter comprising a trellis encoder and a Reed Solomon (RS) parity generator,
• wherein the trellis encoder comprises two multiplexers, three internal memories and two adders, each of the two multiplexers receiving values stored in two of the three internal memories from the two internal memories, respectively,
• wherein the three internal memories are initialized when values of an initialization region in an input stream, corresponding to the stream recited by the tuner, are input to the two multiplexers,
• wherein the input stream is changed according to the initialization of the three internal memories,
• wherein the RS parity generator compensates a parity of the input stream according to the values of the initialization region which are changed by the initialization, and
• wherein two symbols, that is, four bits, of four symbols derived from the initialization region are used for the initialization, and last two symbols, that is four bits, derived from the initialization region are not used for the trellis initialization and are treated as symbols from a known data byte.

A signal processing method for a digital broadcast receiver, the method comprising:

• receiving a stream;
• demodulating the received stream;
• and
• equalizing the demodulated stream,
• wherein the received stream is transmitted from a digital broadcast transmitter comprising a trellis encoder and a Reed Solomon (RS) parity generator,
• wherein the trellis encoder comprises two multiplexers, three internal memories and two adders, each of the two multiplexers receiving values stored in two of the three internal memories from the two internal memories, respectively,
• wherein the three internal memories are initialized when values of an initialization region in an input stream, corresponding to the stream recited by the tuner, are input to the two multiplexers,
• wherein the input stream is changed according to the initialization of the three internal memories,
• wherein the RS parity generator compensates a parity of the input stream according to the values of the initialization region which are changed by the initialization, and
• wherein two symbols, that is, four bits, of four symbols derived from the initialization region are used for the initialization, and last two symbols, that is four bits, derived from the initialization region are not used for the trellis initialization and are treated as symbols from a known data byte.