Solid state image pick-up apparatus for converting the data cloc

Details Solid state image pick-up apparatus for converting the data cloc Solid state image pick-up apparatus for converting the data cloc

1995-07-17

1996-05-28

Metjahic, Safet

Television

Camera, system and detail

Combined image signal generator and general image signal...

348272, 348265, 348492, 348 71, H04N 5228

Patent

active

055216374

ABSTRACT:
A solid-state image pickup apparatus for generating image pickup signals produced by a solid-state image sensor. The image sensor is driven at a data rate of f.sub.s1 with a predetermined phase. Digital luminance signal Y and two digital chrominance signals C.sub.R, C.sub.B are generated by a first digital processing unit, operated at a clock rate related to the data rate of f.sub.s1, from the digitized image pickup signals. These signals are then converted by a second digital processing unit into signals Y, C.sub.R and C.sub.B having a data rate related to f.sub.s2. The second digital processing unit performs bandwidth limitations on these signals by a half band filter having a passband f.sub.s2, f.sub.s2 /2 and f.sub.s2 /2 and performs data rate conversion of from 2f.sub.s1 to f.sub.s2, from f.sub.s1 to f.sub.s2 /2 or f.sub.s2 /4 and from f.sub.s1 to f.sub.s2 /2 or f.sub.s2 /4, for outputting the low order linear phase finite impulse response sufficient to suppress high-order sideband components in the vicinity of n.multidot.2f.sub.s1, n.multidot.f.sub. s1, and n.multidot.f.sub.s1, (n being a positive integer) in a form that can be down-sampled at f.sub.s2, f.sub.s2 /2 or f.sub.s2 /4 and f.sub.s2 /2 or f.sub.s2 /4. The second digital processing unit can have a simplified construction when the characteristics of the half band filter are used to compensate for the band pass rollover characteristics of the rate-converting filter.

REFERENCES:
patent: 4870661 (1989-09-01), Yamada et al.
patent: 5043798 (1991-08-01), Emori
patent: 5136379 (1992-08-01), Ishii
patent: 5272524 (1993-12-01), Nagumo et al.
patent: 5359428 (1994-10-01), Kubota et al.
SMPTE Journal, vol. 100, No. 1, Jan. 1991, U.S., pp. 19-22 "A complete post-production system for all video formats."

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