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Article #14703Re: Circuit to vertically crop NTSC video (letterbox)
From: jvannes
Date: Wed, 18 Nov 1992 02:49
Date: Wed, 18 Nov 1992 02:49
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In article <1992Nov17.165051.13069@cis.ohio-state.edu>, fontana@apache.cis.ohio-state.edu (Mark Fontana) writes... >I'm interested in constructing a circuit to place in line while >dubbing video between two standard NTSC VHS VCR's that would allow >variable cropping of the image for a "letterboxed" effect. There would Your on the right track. Unfortunately, to modify a video signal you need to separate the video info from the sync pulses, modify the video, then mix the sync back in. Check out the video scene switcher project by Graf/Sheets in the November 89' Radio-Electronics. This has the basic circuit you need. They also did a special effects generator (R-E 9/87, 10/87) that may have some useful info. Good Luck!
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Newsgroups: sci.electronics,rec.video Path: arc1-ca.pugleaf.net!sparky!uunet!caen!saimiri.primate.wisc.edu!zazen!news From: jvannes@vms.macc.wisc.edu Subject: Re: Circuit to vertically crop NTSC video (letterbox) Message-ID: <1992Nov18.085836.11831@macc.wisc.edu> Sender: news@macc.wisc.edu (USENET News System) Organization: University of Wisconsin Academic Computing Center Distribution: usa Date: 18 NOV 92 02:49:50 Lines: 12