Abstract: A HDTV receiver which is improved in its overall performance and is simplified in its configuration, by improving a symbol timing restoring circuit, includes a tuner for selecting a necessary channel from input signals via an antenna, an IF processing & carrier restoring portion for performing an IF process & carrier restoration from the output of the tuner, an analog-to-digital converter (ADC) for converting the output of the IF processing & carrier restoring portion into a digital signal, a timing restoring portion for restoring a timing from the output of the ADC, a 2:1 down-sampler for 2:1 down-sampling the output of the ADC, a sync detector for detecting a sync from the output of the 2:1 down-sampler, a channel equalizer for performing a channel equalization from the output of the 2:1 down-sampler, a phase controller for correcting the phase error from the output of the channel equalizer, an optimal viterbi decoder for performing a viterbi decoding operation from the output of the phase controller, a dei

Abstract: A demodulating system for a high definition television (HDTV) that includes a tuning circuit for selecting one out of a plurality of received radio frequency (RF) signals and for converting the selected signal into an intermediate frequency (IF) signal according to an input loop-controlling signal. An oscillating circuit generates a sine wave signal. A filtering circuit passes only a pilot signal containing HDTV carrier information from the IF signal and cancels the remainder. A FPLL circuit for using a predetermined algorithm to form a loop-controlling signal for synchronizing the frequency and phase of the pilot signal and the frequency and phase of the sine wave and providing the loop-controlling signal to the tuning circuit.

Abstract: A channel equalizer for a high definition television that enhances the convergent speed of the channel equalizer by renewing first a filter coefficient of a near ghost image and then renewing a filter coefficient of a far ghost image, after distinguishing the filter coefficient corresponding to the near ghost image from the filter coefficient corresponding to the far ghost image.

Abstract: A HDTV receiver which is improved in its overall performance and is simplified in its configuration, by improving a symbol timing restoring circuit, includes a tuner for selecting a necessary channel from input signals via an antenna, an IF processing & carrier restoring portion for performing an IF process & carrier restoration from the output of the tuner, an analog-to-digital converter (ADC) for converting the output of the IF processing & carrier restoring portion into a digital signal, a timing restoring portion for restoring a timing from the output of the ADC, a 2:1 down-sampler for 2:1 down-sampling the output of the ADC, a sync detector for detecting a sync from the output of the 2:1 down-sampler, a channel equalizer for performing a channel equalization from the output of the 2:1 down-sampler, a phase controller for correcting the phase error from the output of the channel equalizer, an optimal viterbi decoder for performing a viterbi decoding operation from the output of the phase contr