Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1992-09-04
1994-02-01
Groody, James J.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
375 13, H04N 708, H04N 514, H04N 5208, H04N 5213
Patent
active
052836509
ABSTRACT:
A system for improved ghost cancellation for use in particular in television receivers. The system featuring a superior ghost cancellation reference (GCR) signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwidth necessary for effective channel characterization which also exhibiting a higher and more evenly distributed amplitude versus time characteristic than that provided by known, non-cyclic ghost cancellation signals. The GCR signal is encoded a selected television line of an eight field sequence of lines however the polarity of the GCR signal is reversed selectively from field to field prior to inserting it in respective television lines. At a decoder or television receiver incorporating the invention, the selected television lines are combined in a manner which provides for both a robust received GCR value and cancellation of the effects of pair-wise constant television line signals on the GCR signals.
REFERENCES:
patent: 4047224 (1977-09-01), Yamaguti
patent: 4393397 (1983-07-01), Holmes
patent: 5117291 (1992-05-01), Ardekani et al.
patent: 5121211 (1992-06-01), Koo
patent: 5184221 (1993-02-01), Nishi et al.
Greenberg Craig B.
Koo David
Sato Takashi
Burgess Glenton B.
Groody James J.
Marion Michael E.
North American Philips Corporation
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