Patent ID: 7577208

Claim:
A digital broadcast transmitter, comprising: a convolutional encoder encoding an input signal to generate first and second output signals; and a trellis-coded modulation (TCM) encoder encoding the first and second output signals to generate third, fourth, and fifth output signals, wherein the convolutional encoder comprises: a plurality of multipliers, each i th multiplier multiplying the input signal by a constant k i to generate an i th multiplier value, wherein the constant k i is greater than 1 for at least one value of i; a plurality of memories, a first memory storing a previous value of the second output signal as a first memory value and each i+1 th memory storing an i+1 th memory value obtained by adding an i th memory value stored in an i th memory and the i th multiplier value; and a plurality of adders, each i th adder adding the i th memory value and the i th multiplier value, wherein i=1, 2, 3, . . . , n, and the n+1 th memory value stored in the n+1 th memory is a current value of the second output signal.