Method and apparatus for processing a ghost cancellation referen

Details Method and apparatus for processing a ghost cancellation referen Method and apparatus for processing a ghost cancellation referen

1995-10-25

1997-04-08

Burgess, Glenton B.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348611, H04N 521

Patent

active

056192789

ABSTRACT:
In a ghost cancellation system, it is necessary to synchronize the system to the ghost cancellation reference (GCR) signal contained in the video signal. A free-running oscillation, having a frequency which is the same as that used in generating a reference GCR signal, is used to clock the sampling of the video signal. This assures frequency coherence between the input GCR signal and the stored reference GCR signal. By using cross-correlation, the phase error between the sampled input GCR signal and the stored GCR signal is determined. Based on this phase error, a phase-corrected reference GCR signal is generated and stored. This phase-corrected reference GCR signal is then used in the generation of an error function involving the sampled input GCR signal, the error function being used for eliminating ghosts in the input video signal.

REFERENCES:
patent: 5047859 (1991-09-01), Koo
patent: 5121211 (1992-06-01), Koo
patent: 5386243 (1995-01-01), Huang et al.
patent: 5389977 (1995-02-01), Lee
patent: 5481316 (1996-01-01), Patel

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