An equalizer is controlled using a sync signal in a digital vestigial sideband
system is provided, in which the sync signal is accurately separated even though
a ghost having a short delay time and a large size is generated. A switching unit
is provided between a matched filter and the equalizer, which selects one of two
input signals according to rejection filter on/off control signals and separates
a data segment sync signal and a data field sync signal from the selected input
signal. A control signal is produced via the separated sync signal to control the
equalizer to operate in one of a blind mode and a training sequence mode. Since
the equalizer performs sync signal separation by using the ghost removed signal,
a system initial operational time becomes shorter, and accurate sync signal separation
is possible even if severe ghosts occur, to thereby improve degeneration of system
performance greatly.
