Patent ID: 7613246

Claim:
A method of processing a digital television (DTV) signal in a DTV receiver, the method comprising: receiving digital broadcast data, wherein the digital broadcast data result from encoding an input bit using a convolutional encoder to output first and second data bits, multiplexing the first and second data bits with ATSC data bits using a multiplexer to output third and fourth data bits, and encoding the third and fourth data bits using a TCM encoder to output fifth, sixth, and seventh data bits, wherein encoding the input bit using the convolutional encoder comprises: pre-storing a first memory value in a first memory, the first memory value being a previous second data bit output from the convolutional encoder; adding the input bit to the first memory value pre-stored in the first memory to obtain a second memory value; and storing the second memory value in a second memory, wherein the first data bit is based on the input bit and the second data bit is the second memory value stored in the second memory; performing TCM decoding on the received broadcast data at a rate of 2/3; and decoding the TCM-decoded broadcast data at a rate of 1/2.