Re: Open hardware AV to digital conversion

From: Ingo Korb <>
Date: Mon, 05 Jan 2015 00:45:04 +0100
Message-ID: <> writes:

> - reconstruct proper, norm compliant, interlaced signal in almost real time 

Yuck, NO!

Too many devices today already treat the C64's signal as interlaced and
apply deinterlacing methods of varying horribleness to it. This results
in effects such as smeared moving objects, vertical jitter in horizontal
scrollers or temporary vertical shifts.

It's a progressive video signal, just treat it as such and don't try to
force the display into deinterlacing it - if 240p/288p is a problem,
line-doubling it to 480p/576p is very simple and doesn't need much RAM.

An example, taken from a PAL Atari ST in color mode (320x200):

Signal incorrectly treated as 576i and deinterlaced (GBS-8220):

Signal correctly treated as 288p and linedoubled (Micomsoft XRGB Mini):

On the C64, Giana Sisters is a really nice test case for this, but I
don't have a good sample video online right now.


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Received on 2015-01-05 00:00:03

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