Path: utzoo!utgpu!water!watmath!clyde!bellcore!faline!thumper!ulysses!gatech!hubcap!rchampe
From: rchampe@hubcap.UUCP (Richard Champeaux)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Fixing flicker, & future frame rate issues
Message-ID: <1367@hubcap.UUCP>
Date: 11 Apr 88 22:24:23 GMT
References: <11157@ut-sally.UUCP> <8528@agate.BERKELEY.EDU> <11182@ut-sally.UUCP> <8577@agate.BERKELEY.EDU>
Organization: Clemson University, Clemson, SC
Lines: 26

In article <8577@agate.BERKELEY.EDU>, doug@eris (Doug Merritt) writes:
> 
> To be more explicit, you could fix flicker by doing the following:
> 	- get a half-frame of video from the Amiga (say the even lines)
> 	- display it twice in the 1/30th of a second before the next
> 	  half-frame (the odd lines) comes in.
> 	- repeat on this next half-frame (now we're doing odd lines)
> This gives 120hz interlaced, causing a 60hz flicker rate, above the
> 40hz "critical flicker fusion rate", which perceptually eliminates flicker.
> 
> 	Doug Merritt		doug@mica.berkeley.edu (ucbvax!mica!doug)
> 			or	ucbvax!unisoft!certes!doug

     Could you explain this a little more, I not sure I follow what you're
saying.  If you have a horizontal single pixle width line, it would be on the
screen every other 1/60th of a second interval.  (I might be wrong but I
think you meant that each half-frame comes in every 1/60th of a second).
What I'm trying to ask is: no matter how many times you display a half frame
before the next one comes in, won't that horizontal line still be on the screen
only every other 1/60th of a second interval?

  Excuse my comments if they seem stupid or have already been said, because
I kind of dropped in the middle of this debate and missed the earlier messages.

Rich Champeaux
Clemson University