Abstract: Device and method for tracking a phase error in a digital TV receiver, wherein a phase noise compensated I signal is subtracted from I level reference signals of VSB signal, to obtain an error of the I signal, a sign of the Q signal having a phase noise thereof compensated is multiplied to the error of the I signal from the error determining part, to estimate a basic phase error, and a phase error compensating area is determined, a preset constant ‘&agr;’ is multiplied to the basic phase error to provide a final phase error in the determined phase error compensating area, and the basic phase error is provided as it is as the final phase error in other areas, thereby estimating the phase error more accurately.

Abstract: Disclosed are a channel equalizer and digital television receiver using the same. The equalizer comprises a channel estimator, a channel distortion compensator and noise canceller. The channel estimator estimates an impulse response of a transmission channel from a received signal. The channel distortion compensator transforms and processes the received signal and the estimated impulse response. The noise canceller predicts and eliminates amplified noise generated during equalization.

Abstract: Channel equalizer of VSB modulation system in a digital TV receiver, including a frequency domain equalizer for equalizing a received signal to remove a distorted component from the received signal, a noise removing part for removing noise from the equalized signal, a time domain equalizer for equalizing a signal from the frequency domain equalizer or the noise removing part to remove a distorted component from the signal, and an error providing part for estimating an error required for renewal of a coefficient at the time domain equalizer by using a signal from the time domain equalizer or the noise removing part, and feeding the error back to the time domain equalizer.

Abstract: VSB reception system with a frequency domain equalizer including a demodulating part for receiving, converting, and demodulating a signal, a frequency domain equalizing part for equalizing the demodulated signal for removing a distorted component from the demodulated signal, and a noise removing part for (a) receiving the equalized signal, (b) calculating a reference error signal that is a difference between the equalized signal and the signal having the noise removed therefrom, (c) calculating an error signal that is a difference between the reference error signal and the extracted noise signal, (d) renewing parameters with reference to the reference error signal and the error signal, and (e) calculating a difference between the equalized signal and the extracted noise signal, to provide a signal having the noise removed therefrom.

Abstract: A mixed green light-emitting phosphor for a fluorescent screen of a projection cathode ray tube is prepared by mixing LaOCl phosphor activated with Tb with at least a mixture of phosphors selected from the group of a Y.sub.3 (Al,Ga).sub.5 O.sub.12 phosphor activated with Tb and a Zn.sub.2 SiO.sub.4 phosphor activated with Mn, a Y.sub.3 (Al,Ga).sub.5 O.sub.12 phosphor activated with Tb and a InBo.sub.3 phosphor activated with Tb, or a InBO.sub.3 phosphor activated with Tb and a Zn.sub.2 SiO.sub.4 phosphor activated with Mn. The fluorescent screen of the cathode ray tube is tested under standard drive conditions. From the test results, it is noted that the characteristics of the brightness and the C.I.E. coordinates of the fluorescent screen using the mixed green light-emitting phosphors is remarkably improved compared with that of the conventional Y.sub.3 Al.sub.5 O.sub.12 phosphor activated with Tb.

Abstract: A green emitting phosphor for use in a color cathode ray tube and a cathode ray tube using the said green emitting phosphor are disclosed. The green emitting phosphor according to the present invention satisfies the following general formula:[ZnS:CuAuAlM](where M indicates at least one element of Ce, Tb, Eu, Sc and La.), i.e., the green emitting phosphor according to the present invention is prepared by adding a trace of one of the above mentioned rare earth elements to the conventional [ZnS:CuAuAl] green emitting phosphor. The green emitting phosphor thus prepared according to the present invention is highly luminescent and thermally stabilized, as well as improving the work efficiency.