Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1995-11-29
1997-04-22
Peng, John K.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348607, H04N 521
Patent
active
056233205
ABSTRACT:
An improved ghost prevention apparatus for a television capable of preventing ghost of a picture of a television, which occurs due to a detection wave distortion, by generating a key pulse within a part of a horizontal synchronous section of a timing signal generator, by turning on an automatic phase controller for the key pulse generation section and turning off the same for the remaining horizontal synchronous, which includes a synchronous separator for separating horizontal and vertical synchronous signals, respectively, from a combined picture signal detected by a picture wave detector; a timing signal generator for generating a key pulse in a horizontal synchronous range in accordance with a horizontal synchronous signal outputted from the synchronous separator and for generating a vertical blanking signal in a vertical synchronous range in accordance with a vertical synchronous signal; a first sampling holder for sample-holding a phase control signal outputted from the picture wave detector, outputting the thusly sample-holden phase control signal to the picture wave detector in accordance with a key pulse outputted from the timing signal generator, and enabling the picture wave detector; and a second sampling holder for sample-holding an AGC wave detection signal outputted from an AGC circuit, disabling the AGC circuit in accordance with a vertical blanking signal outputted from the timing signal generator.
REFERENCES:
patent: 4364093 (1982-12-01), Holmes
patent: 4374400 (1983-02-01), Holmes
patent: 5311315 (1994-05-01), Sakata
patent: 5389977 (1995-02-01), Lee
Grant Chris
LG Electronics Inc.
Peng John K.
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