H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/45
H04N 9/74 (2006.01)
Patent
CA 1106489
ABSTRACT OF THE DISCLOSURE: A part of the luminance signal spectrum Y approximately less than the chrominance signal spectrum is extracted from the input video signal (Y + S.P.) through a single filtering. The subtraction of amplitude of a direct predetermined luminance signal K to the amplitude of luminance signal Y puts out a signal (Y-K). The latter signal is cut out by switching at a reference voltage under the control of a switching signal representing pictures for special effects, and is then subtracted from the video signal (Y + S.P.). When the switching signal selects the reference voltage, the output video signal is identical to the input video signal (Y + S.P.). When the switching signal selects signal (Y-K), the output video signal transmits the special effects pictures with predetermined luminance K and a chrominance equal to that cor- responding to the input video signal.
274810
Macheboeuf Guy R.
Mignot Lucien F.
Robic Robic & Associes/associates
Telediffusion de France
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