English NTSC TV's.

[Jon A.]

Originally Posted by NewVista

Fortunately Canadian bureaucrats were on the ball.

Not something that can normally be said abut them.

Our flag for example: Yuck! Before that was brought in, the country's "de jure" flag was the Royal Union flag.

Enough about that I guess.

[NewVista]

Wise government in Ottawa seeks compatibility with US standards.
I always thought Ottawa was in French Quebec! Till I looked it up! This morning!
If it was, Canada would have been SECAM ( Séquentiel couleur à mémoire )!

[Colly0410]

Originally Posted by NewVista

Wise government in Ottawa seeks compatibility with US standards.
I always thought Ottawa was in French Quebec! Till I looked it up! This morning!
If it was, Canada would have been SECAM ( Séquentiel couleur à mémoire )!

& probably 819 lines then convert to 625 lines, both with positive modulation & AM sound..

[colorfixer]

Originally Posted by Colly0410

& probably 819 lines then convert to 625 lines, both with positive modulation & AM sound..

With Pierre Trudeau citing the need for SECAM towards allegiance with France and its two islands St. Pierre and Miquelon. He'd also want to ensure that Canadians wouldn't have full access to US programming in a way not unlike East Germany and West Berlin.

[Penthode]

With Pierre Trudeau citing the need for SECAM towards allegiance with France and its two islands St. Pierre and Miquelon.

What has Trudeau to do with the choice of the Canadian colour standard? The CBC began NTSC colour more than two years before Trudeau became PM.

[colorfixer]

Originally Posted by Penthode

What has Trudeau to do with the choice of the Canadian colour standard? The CBC began NTSC colour more than two years before Trudeau became PM.

"...his close ties with Co-operative Commonwealth Federation (CCF) intellectuals (including F. R. Scott, Eugene Forsey, Michael Kelway Oliver and Charles Taylor) led to his support of and membership in that federal democratic socialist party throughout the 1950s."

"His decision to join the Liberal Party of Canada rather than the CCF's successor, the New Democratic Party (NDP) was partly based on his belief that the federal NDP could not achieve power. He also doubted the feasibility of the centralizing policies of the party."

He was in government in the late 60's and his propensity to intervene across portfolios in government was legendary. He later waged a personal campaign for example against what he figured was the Americanizing of Canadian media... the story of CKLW was a perfect example. Given the chance and if technology existed, he would have had no issue closing off Canadians' access to US media. What we have now through regulation of the CRTC (and previously via the CBC) was a direct result of his mandate.

[NewVista]

KS0127 datasheet.

Says it comb filtered PAL with two lines storage, didn't know that could be done, wonder if later PAL TVs that promised Comb filtering really did it?

[ceebee23]

Fascinating you find the 50hz flicker an issue.... I never notice it.

I do notice the problem of 100 less lines though with 480i.

Have you watched 625/50 in a 50hz environment? I am wondering if your problem is the mix of 50hz flicker and 60hz lighting?

The CT100 of course had true phosphors.

[dtvmcdonald]

The 50Hz I have seen has all been in 50Hz South American countries, Malaysia,
and England.

I was in Malaysia at the height of the CRT to flat screen "always on"
transition and the flicker difference between
CRT and LCD was amazing. In the US one could see flicker (at 60 HZ)
on CRTs only on the brightest computer monitors with a full-white
screen. It seemed to go away about 72 or 75 Hz

Of course, given the terrible 50HZ flicker problem, perhaps
European producers avoided white screens even more
than ours did (because of blooming in tube sets
on white screens).

I never noticed a resolution difference between 525 and 625 lines,
vertical resolution. But I never compared side to side.

[wa2ise]

Originally Posted by dtvmcdonald

The 50Hz I have seen has all been in 50Hz South American countries, Malaysia,
and England.
...

Back in the 80's there was talk of using frame stores to store the image and play it twice, to get the refresh rate to 100Hz. This was when CRTs were the only game in town.

[ppppenguin]

Originally Posted by wa2ise

Back in the 80's there was talk of using frame stores to store the image and play it twice, to get the refresh rate to 100Hz. This was when CRTs were the only game in town.

I first saw this in a lab in the mid 1980s, before commercially available 100Hz sets. At first I could hardly see flicker even at 50Hz but after a while I became attuned to it. Watching 100Hz pictures felt very relaxed compared to 50Hz.

LCD sets inherently don't flicker, regardless of frame rate. The LCD cells have a zero order hold function by their nature. Motion portrayal is a different problem. LCDs have a laggy response, almost inevitably worse than CRTs, despite the whole arsenal of tricks employed by panel and set makers.

[NewVista]

People from 60hz countries often see flicker in 50hz countries for first day, then it goes away for rest of vacation!

By 1980s Tint control hidden in menu and best not messed with as solid state TVs had very accurate burst-Φ lock. To assess ⌂Φ over cable or network one would need a reference signal, chroma stairstep or color bars, on a vertical interval (VI) line and a vectorscope at receiving end. A cheap way would be to have a signal at burst phase in VI at 50% picture level & micro trim Φ with this?

[NewVista]

405/525 line systems benefit from improved vert sync design for interlace, reduction of overscan to <1%, progressive scan with upscaling interpolation to 1080 & vertical aperture correction. For horizontal, analog or digital comb filtering, picture peaking and deactivation of scan-velocity-modulation. Results can look like good 35mm film.

[Colly0410]

My Wife has got epilepsy & was always affected (she'd get a headache & had to limit her viewing) by the 50hz flicker on CRT TV's in England, France, Spain & Malta. When we went to America (60hz flicker) she was hardly affected at all, she could watch a TV film all the way through with no ill effects. So what did she watch the most ? Eastenders that she'd already seen on WPBT (PBS) channel 2 Miami. Girls. (sigh)

We've now got an LCD TV that doesn't flicker at all, had it 6 years. Went to a friends house the other day & they'd got an old CRT TV connected to a digital converter box & boy did it flicker, I found it really annoying, but years ago it never bothered me at all, I think my brains flicker filter has stopped working through non use..

[ceebee23]

BUT how would 525/60 PAL look compared to 525/60 NTSC? How bad was phase error in broadcast tv?

And the reverse what would 625/50 NTSC be like?

Ironically I think in good broadcast conditions ..hardly any difference ...but what happens in less than ideal reception conditions with multipath etc issues?

And afterall the 50hz/60hz issue is related to power supply... and in 1950s not really a matter of choice for the television system.