Patent ID: 7126646

Claim:
A device for tracking a phase error in a digital TV receiver, in which an I signal is restored from a signal transmitted in VSB modulation system, a Q signal is estimated from the restored I signal, a phase noise is tracked from the restored I signal and the estimated Q signal, and the phase noise is compensated, comprising: an error determining part for subtracting the phase noise compensated I signal from I level reference signals of VSB signal, to obtain an error of the I signal; a basic phase error estimating part for multiplying a sign of the Q signal having a phase noise thereof compensated to the error of the I signal from the error determining part, to estimate a basic phase error; a phase error compensating part for determining a phase error compensating area, multiplying a preset constant ‘α’ to the basic phase error to provide a final phase error in the determined phase error compensating area, and providing the basic phase error as it is as the final phase error in other areas; and a phase noise compensating part for adjusting a gain of the estimated final phase error, making complex multiplication of a sine value and a cosine value proportional to the gain adjusted phase error value to the restored I signal and the estimated Q signal, to compensate for the phase error remained in the restored I signal and the estimated Q signal.