Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2005-08-09
2005-08-09
Chin, Stephen (Department: 2634)
Pulse or digital communications
Equalizers
Automatic
C375S229000, C375S231000, C348S607000, C348S608000, C708S300000, C708S819000
Reexamination Certificate
active
06928111
ABSTRACT:
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.
REFERENCES:
patent: 4077053 (1978-02-01), Ishiguro
patent: 5508752 (1996-04-01), Kim et al.
patent: 5602602 (1997-02-01), Hulyalkar
Chin Stephen
File Erin
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