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DuMont's Vitascan system was used to televise small set, single
camera shows such as news. The entire set was enclosed in a box and
the camera projected the light from a high-resolution white phosphor
raster through the camera lens onto the subject. Large reflector
scoops, similar to those used for floodlights, housed multiple
phototubes, which were equipped with R, G, and B Dichroic filters.
The photo tubes picked up a continuous stream of R, G, and B video
signals in perfect sync with the scanning system, which could be
displayed line by line rather than field sequentially. To aid in
walking around inside the enclosed set strobe lights were pulsed
during vertical blanking interval, which produced a ghostly sort of
moonlight effect. The Vita Scan system was very simple using only a
single camera tube, which eliminated multiple tube camera
registration problems. It would have worked great outdoors if we
could have figured out a way to pulse the sun to shine only during
vertical blanking. At a trade show RCA posted a sign on their new
camera "Works In The Sunlight" and Bob Bollen's sign on the
Vitascan camera countered with "Works In The Dark."
Vitascan was designed to work with the NTSC color system.
Steve Dichter sent us this 1956
Vitascan Ad ad from station WITI in Wisconsin. The ad announces
their color tv premiere using the DuMont Vitascan system. The two features
listed at the right "Captain's Paradise" was a b&w picture, while "Blanche
Fury", which aired at the end of the week, was in Technicolor. The
image is from the
Milwaukee
Television History site, courtesy of Dick Golembiewski. Here is a
technical paper presented in 1956 on Vitascan,
a brochure, and an article from the
September, 1955 issue of Popular Science, courtesy of Wallace Dickson.
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