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From: stever@videovax.UUCP (Steven E. Rice)
Newsgroups: net.micro.amiga
Subject: Re: Interlace filter?
Message-ID: <1771@videovax.UUCP>
Date: Sun, 15-Jun-86 04:10:49 EDT
Article-I.D.: videovax.1771
Posted: Sun Jun 15 04:10:49 1986
Date-Received: Wed, 18-Jun-86 04:55:45 EDT
References: <1249@well.UUCP>
Reply-To: stever@videovax.UUCP (Steven E. Rice)
Organization: Tektronix, Comm Group, TV R&D
Lines: 30
Keywords: hires interlace
Summary: When you have interlace, you'll have flicker!

In article <1249@well.UUCP>, Richard Brent Southard (brent@well.UUCP) writes:

> 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
> fundamentals 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?
> 
> . . .

The standard television phosphors are not long-persistence -- this would
cause smearing of moving objects.  The difference is in the material
being displayed.  If you put a high-resolution display composed of all
capital "E"s up on either an Amiga 1080 monitor or a television set in
such a way that the horizontal bars are all written on one field, the
flicker will knock your eyes out!

For a demonstration of interlace artifacts, look closely at thin,
horizontal lines or at the horizontal edges of letters generated by
a character generator.  They can be pretty awful!

					Steve Rice

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