peterk@cbmger.UUCP (Peter Kittel GERMANY) (03/19/91)
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: >>> >>>Hmm. Does anyone know what C= plans to do about the A3000 problems >>>(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*! It starts at the same height as the 1st line of the other field, so they interlace perfectly when you imagine them being a little slanted to the right (vertical deflection causing this). So there is really only one half line of video data to display. Now this is all valid for a standard analog TV set. Hmm, but how is it managed in the Amiga bitplanes? I think I remember they are built of all full lines, also in interlace. So, am I puzzled, or what am I? -- Best regards, Dr. Peter Kittel // E-Mail to \\ Only my personal opinions... Commodore Frankfurt, Germany \X/ {uunet|pyramid|rutgers}!cbmvax!cbmger!peterk
ddyer@hubcap.clemson.edu (Doug Dyer) (03/20/91)
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? -- Hi, I'm a .signature file! Weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee! flames to comp.sys.ibm.pc.misc --------------------------------------------------------------------------- Doug Dyer ddyer@hubcap.clemson.edu (2B)|!(2B) -> ?
pselver@euler.mit.edu (Peter Selverstone) (03/22/91)
In article <1991Mar19.192651.16390@hubcap.clemson.edu> ddyer@hubcap.clemson.edu (Doug Dyer) writes: >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? No. >-- >Hi, I'm a .signature file! Weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee! > flames to comp.sys.ibm.pc.misc >--------------------------------------------------------------------------- > Doug Dyer ddyer@hubcap.clemson.edu (2B)|!(2B) -> ? -- Peter Selverstone - Spy Pond Systems - Arlington, MA - (617)648-7468 pselver@euler.mit.edu bix:pselverstone PLINK:pselverst CIS:72527,2652