Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-06-12
1991-08-27
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 11, 358 22, 358183, H04N 701
Patent
active
050438115
ABSTRACT:
In a scanning line number converting device, a video signal is converted into a digital signal, its scanning lines being thinned out by a thinning-out circuit (5) in the vertical direction to reduce the vertical direction sampling frequency and interpolated so as to form a non-interlace signal. The non-interlace signal is written in a frame memory (7), under control of a writing control circuit (8). A field determination circuit (15) determines a field of a video signal used as reference. According to this determination output, the non-interlace signal is read out of the frame memory while undergoing a conversion into an interlace signal such that its interlace sequence corresponds to that of the reference video signal, resulting in a conversion of the scanning line number. A down-converter for converting a high-resolution TV signal into an NTS signal is configured using this scanning line number converting device. Also, a picture-in-picture television is configures using the scanning line number converting device so as to thin out the scanning lines of a video signal of a sub-picture inserted into a main picture.
REFERENCES:
patent: 4249211 (1981-02-01), Baba
patent: 4698664 (1987-10-01), Nichols
patent: 4791487 (1988-12-01), Kozuki
patent: 4870489 (1989-09-01), Ducret
patent: 4987489 (1991-01-01), Hurley
Britton Howard W.
Conlin David G.
Sharp Kabushiki Kaisha
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