NTSC versus PAL
in [Repair]
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From: William Sommerwerck on 2 Apr 2010 06:50 > I think you'll find that was the intent. However, if the phase error is > too great, the eye averaging doesn't work so well, hence the > introduction of the delay line. > At which point you wonder why bother sending two colour signals in > quadrature if you're just going to average them with the next scan line > anyway. But you don't have to average them. NTSC doesn't. And the delay line can be used for comb filtering. > SECAM avoids that complexity by just going straight to the delay > line. I lived in Paris for 18 months. If there's a quality difference > between a SECAM and PAL picture, it was far from obvious. The problem is, SECAM /requires/ the delay line because the system transmits only the red or blue color-difference signal at any time. This is what I was talking about -- it keeps the transmission side cheap, while making the user pay more for their TV. For most images, you won't see a difference. But in an image with strong vertical color transitions, you'll see aliasing, especially when the image moves vertically.
From: Sylvia Else on 2 Apr 2010 22:49 On 2/04/2010 9:50 PM, William Sommerwerck wrote: >> I think you'll find that was the intent. However, if the phase error is >> too great, the eye averaging doesn't work so well, hence the >> introduction of the delay line. > >> At which point you wonder why bother sending two colour signals in >> quadrature if you're just going to average them with the next scan line >> anyway. > > But you don't have to average them. NTSC doesn't. And the delay line can be > used for comb filtering. > > >> SECAM avoids that complexity by just going straight to the delay >> line. I lived in Paris for 18 months. If there's a quality difference >> between a SECAM and PAL picture, it was far from obvious. > > The problem is, SECAM /requires/ the delay line because the system transmits > only the red or blue color-difference signal at any time. This is what I was > talking about -- it keeps the transmission side cheap, while making the user > pay more for their TV. > > For most images, you won't see a difference. But in an image with strong > vertical color transitions, you'll see aliasing, especially when the image > moves vertically. > > If we were building an analogue colour TV transmission infrastructure now, then maybe we'd go the NTSC route, since it eliminates the delay line. But it's undoubtedly true that, for whatever reasons, in earlier times, NTSC didn't perform that well, whereas those whose systems were PAL or SECAM got good colour pictures from day one. Sylvia.
From: Sylvia Else on 2 Apr 2010 22:58 On 3/04/2010 1:55 PM, Phil Allison wrote: > "Stupider than Anyone Else Alive" > > >> If we were building an analogue colour TV transmission infrastructure now, >> then maybe we'd go the NTSC route, since it eliminates the delay line. > > ** Total insanity. You realise there are two different delay elements required in a PAL/SECAM set? > > >> But it's undoubtedly true that, for whatever reasons, in earlier times, >> NTSC didn't perform that well, > > > ** The laws of nature have not changed since 1953 I think engineering techniques have. Sylvia.
From: stratus46 on 3 Apr 2010 00:36 On Apr 1, 10:08 pm, "Phil Allison" <phi...(a)tpg.com.au> wrote: > <stratu...(a)yahoo.com > > > In * REALITY * the NTSC broadcast signal is massively compromised in > > comparison to a PAL signal. > > PAL has plenty wrong with it and is 'massively compromised' the same > ways as NTSC. > > ** More INSANE CRAPOLOGY !!!!!!!!!! > > Editing in composite PAL ..... > > ** More fuckwit, OFF TOPIC CRAPOLOGY !! > > See the words " broadcast signal " - fuckhead ??? > > Even know what it means ??? > > ..... Phil They still do some composite D-2 editing at CBS network. Or don't they count as broadcast? G²
From: Phil Allison on 3 Apr 2010 00:40
<stratus46(a)yahoo.com> > ** More fuckwit, OFF TOPIC CRAPOLOGY !! > > See the words " broadcast signal " - fuckhead ??? > > Even know what it means ??? > They still do some composite D-2 editing at CBS network. Or don't they count as broadcast? ** Hey fuckwit. In relation to television transmission - where does one find the " broadcast signal " ??? Don't strain you tiny brain thinking too hard. ...... Phil |