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From: ddyer@hubcap.clemson.edu (Doug Dyer)
Newsgroups: comp.sys.amiga.misc
Subject: Re: The 1/2 line artifact (Was: CBM Support is GREAT!)
Message-ID: <1991Mar19.192651.16390@hubcap.clemson.edu>
Date: 19 Mar 91 19:26:51 GMT
References: <1991Mar4.024723.4765@sugar.hackercorp.com> <13397@hubcap.clemson.edu> <19802@cbmvax.commodore.com> <1991Mar13.062558.1013@galois.mit.edu> <976@cbmger.UUCP>
Organization: Clemson University
Lines: 28

peterk@cbmger.UUCP (Peter Kittel GERMANY) writes:

>In article <1991Mar13.062558.1013@galois.mit.edu> pselver@euler.mit.edu (Peter Selverstone) writes:
>>In article <19802@cbmvax.commodore.com> daveh@cbmvax.commodore.com (Dave Haynie) writes:
>>>In article <13397@hubcap.clemson.edu> ddyer@hubcap.clemson.edu (Doug Dyer) writes:
>>>>
>>>>(specifically the deinterlacer's flickering black line)?  Is this a bug
>>>>that they will fix or is it a feature? 
>>>
>>>Technically speaking, it's a feature.  Converting a full NTSC frame the way
>>>the A3000's Amber chip does it is just guaranteed to give you that flickering
>>>1/2 line.  That's an effect of the NTSC standard and the way its different
>>>frames get displayed.
>>
>>No Dave, NTSC has nothing to do with it.  Don't believe everything
>>you hear.  An interlaced field has 262.5 horizontal intervals which
>>become 525 unique lines at twice frequency.  With a static image
>>there is no reason for these lines to change.

>Sorry to disagree. One of those fields (let's assume the odd one)
>begins with *a half line starting in the middle of the screen*!

Damn. Its a feature.  Does the flickerfixer do this too?
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