Talk:Philips circle pattern

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using the correct or best image

when i found this page it was showing a rather ugly hand drawn version of the PM5544 so i uploaded and used my own version. it is also drawn, but it is very accurate due to following the technical specification of the PM5544 as close as possible. then someone called RTFMASAP comes and reverts it *and* changes the correct, screencapped, PM5644 (widescreen) with another drawn, and wrong, one.

some examples of differences:

- the color bars and yellow at the bottom are really 75%, not 100%. this is because (modulated) composite video cannot show fully saturated colors at 100% brightness. this is also used for "blue only" mode, where they have the same brightness as the grey block pattern right above it.

- the resolution pattern below the centre is a sine wave pattern, not a square wave pattern, hence it looks blurry.

- the colors in the [ ] aren't chosen at random, they are special YUV colors and can be accurately calculated.

- the horizontal grid lines are all 2 scanlines thick. the horizontal convergence test line in the center is also 2 scanlines thick, and at an odd number of scanlines difference from the grid lines to allow for an interlaced line pairing test.Bewareircd (talk) 17:42, 13 July 2008 (UTC)[reply]

- the grid squares are 42 scanlines high.

- also, PM5644, widescreen, is *not* HDTV. it is standard definition PAL, but simply stretched out to 16:9 aspect ratio. —Preceding unsigned comment added by Bewareircd (talk • contribs) 22:26, 12 July 2008 (UTC)[reply]

the other testcard: [1]

my testcard: [2]

reference page: [3] you can read the full specs, and also make visual comparisons between my and the other test card here, and the numerous test card pictures on that page - scroll down on it. Bewareircd (talk) 22:14, 12 July 2008 (UTC)[reply]

Equipment vs. Test Pattern

The article doesn't make a clear distinction between the PM5544 test pattern generator (the equipment) and the PM5544 test card (the output signal) that it generates. In the opening sentence the PM5544 is described as a "test pattern generator", later the article talks about "this test pattern", and later again about "the unit", suggesting equipment again. I believe this should be solved. Note that the Philips PM5544 is not the only equipment used to generate PM5544 test patterns. Jaho 07:06, 1 December 2007 (UTC)[reply]

By the way, does someone have a picture of an original Philips PM5544 unit (the equipment)? Jaho 07:12, 1 December 2007 (UTC)[reply]

PM5544 test pattern technical questions

Which tests and checks can be done with this test card? Abdull 13:27, 17 April 2006 (UTC)[reply]

An answer to your question can be found here: [4]. Jaho 03:26, 1 December 2007 (UTC)[reply]

Don't know how much this explains, but in the Swedish version, there was a small line moving, and the correct time was given digitally. 惑乱分からん 19:12, 28 September 2006 (UTC)[reply]

Apparently you're talking about the animated digital version. Info about that moving line can be found on the same article as above (here: [5]; scroll down a bit). Jaho 06:25, 1 December 2007 (UTC)[reply]

Test Pattern used in Australia

This Test Pattern was also used by ABC Television Australia. Kathleen.wright5 11:30, 15 September 2007 (UTC)[reply]

Actually a huge number of broadcasters around the world are using this test pattern in some form, I believe it wouldn't be a good idea to mention them all here on wikipedia. I've removed your remark from the article. Jaho 03:18, 1 December 2007 (UTC)[reply]

SABC in South Africa

SABC in South Africa used a variation of the Philips PM5544 Test Card in the 1980s. -- Firefishy (talk) 10:33, 3 March 2009 (UTC)[reply]

Better version of the 16x9 (PM5644) test pattern added

The existing screen captured version was small and very jagged, so I uploaded a full resolution version I have created in graphics software to match specifications as closely as possible. It reveals the small circles with definition lines, as well as the non-switched carriers in the outermost columns which were used in analog broadcasts to reveal phase errors in the color decoding.

Zacabeb (talk) 22:27, 13 May 2009 (UTC)[reply]