Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!philabs!prls!pyramid!hplabs!well!brent
From: brent@well.UUCP (Richard Brent Southard)
Newsgroups: net.micro.amiga
Subject: Interlace filter?
Message-ID: <1249@well.UUCP>
Date: Mon, 9-Jun-86 18:39:48 EDT
Article-I.D.: well.1249
Posted: Mon Jun  9 18:39:48 1986
Date-Received: Wed, 11-Jun-86 00:39:26 EDT
Organization: Whole Earth Lectronic Link, Sausalito, CA
Lines: 22
Keywords: hires interlace

There are a few questions I'd like answered once and for all, if anyone here is
knowledgeable  on  the topic of video signal processing.  I understand the fun-
damentals involved  with  the  Amiga's  interlaced  video  mode.    However,  I
understand  that  a standard television uses the same principles for generating
its display, and yet there is (normally) no flicker noticeable on a  television
screen.    The  only  thing I can figure is that a tv uses a longer-persistance
phosphur than the standard Amiga monitor (model 1080).  This would  imply  that
using  composite  video output from the Amiga with a television would provide a
flicker-free display, although without the clarity of the  RGB  display.    Has
anybody tried this?

Now here's the interesting part...  While conferencing on CompuServe, an Amiga-
Forum member mentioned that he had overcome the flicker problem on his 1080
monitor.  He said that he'd done this by filtering his video signal through an
"Interlaced Signal Filter" (I believe).  Now, I don't understand what this
filter could do  to  the  signal to make it flicker-free.  It seems that the
only way around flicker in 640x400 mode on the 1080 would be to draw all 400
lines in one  scan (1/60th  of a second).  On the other hand, if such a device 
exists, how does it work?  What magic massaging is done to the signal? 
Anybody familiar with this stuff?

brent