Television – Image signal processing circuitry specific to television
Patent
1996-07-26
1999-11-09
Peng, John K.
Television
Image signal processing circuitry specific to television
348525, 348505, 348533, 348733, H04N 544
Patent
active
059824514
ABSTRACT:
A video signal level detector is configured to avoid the erroneous recognition of channels adjacent to normal channels as those which are to be stored during performance of an automatic channel detection and storage function. The video signal level detector separates at least two target signals whose levels are to be detected from an input composite video signal; detects signal levels of the target signals; compares each of the detected levels with a reference voltage level; and logic-operates the result to obtain a final detection so that a storage possibility of automatically detected channels is determined. The video signal level detector includes a signal separator for separating at least two target signals whose levels are to be detected from an input composite video signal; at least two signal level detectors for detecting signal levels of the target signals separated by the signal separator, respectively; at least one comparator installed in each one of the signal level detectors for comparing the signal level of a corresponding one of the target signals with a reference voltage level; and a logic gate for receiving and logic-processing outputs of the comparators.
REFERENCES:
patent: 4543614 (1985-09-01), Chen et al.
patent: 5157492 (1992-10-01), Tults et al.
patent: 5701601 (1997-12-01), Tomoe et al.
LG Semicon Co. Ltd.
Peng John K.
Sajous Wesner
LandOfFree
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