Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!mips!daver!lynx!vik
From: vik@lynx.uucp (Vikram Sohal)
Newsgroups: comp.sys.amiga
Subject: DigiView Problems
Keywords: Video, Noise, Cables
Message-ID: <8364@lynx.UUCP>
Date: 19 Dec 90 16:59:29 GMT
Reply-To: vik@lynx.UUCP (Vikram Sohal)
Distribution: na
Organization: Lynx Real-Time Systems Inc, Los Gatos, CA
Lines: 26


  I have been trying to use my DigiView frame grabber on my A500 to grab frames 
off of my VCR by using the frame freeze option on the VCR and then grabbing
the signal using DigiView. I get the image, but there is always a lot of 
distorting banding in the form of diagonal stripes across the image. I have the
latest DigiView software, but my actual DigiView hardware is about 3 years old
(I got it from a friend). At first, I thought that it was my VCR (which was
an old 2-head unit with a shaky freeze frame mode) so I replaced it with a 
brand-new SVHS unit with a digital freeze frame mode. I still get the banding.
It looks like what would happen if there was line noise in the signal moving in
horizontal stripes up the screen (the diagonal effect appears to be from the
DigiView hardware grabbing a little bit of the signal at a time thereby allowing
the interference band to move upwards a little before getting it again, but at
a different vertical position). I tried connecting the signal directly to my
TV monitor and did'nt notice too much interference in the signal. 
   Has anyone out there had this problem? How is it solved? Filters? A 
sledgehammer? a new DigiView?

ADVthanksANCE for any help you can send my way!

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Vic Sohal      
Lynx Real-Time Systems                 "MIPS is MIPS"
(408) 354-7770 
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