HD telly 1080i/50

JamesTaylorfan

Anyone explain what 1080i/50 means...it shows up as my Sony Bravia telly boots up.

John mac

means its receiving a 1080i signal at 50 hertz .

is that on sky hd?

ScrubsfanChris

This might be the wrong section, but anyway.....

1080i could be the resolution that the tv is set to display, or if your tv is HD Ready and not Full HD than it is displaying its maximum resolution.
Not sure about the 50 but I think it has something to do with the fps.

ScrubsfanChris

John mac wrote: »

means its receiving a 1080i signal at 50 hertz .

50 hertz seems very slow, how old is the tv JamesTaylorfan?

T-Square

John mac wrote: »

means its receiving a 1080i(nterlaced) signal at 50 hertz .

is that on sky hd?

It means it can write one thousand and eighty lines in two passes, fifty times per second.

A better quality TV will have 1080p, which means it can write all 1080 lines to the screen in one passes. Not-interlaced.

You need 1080p @ 100Hz
which can write the image to all 1080 lines in one go, and do this 100 times per second.

A panel size used in mid-range HDTVs is 1366 x 768; these are often advertised as 1080i "compatible" or "HD ready" - however these HDTVs, while accepting a 1080i signal scales it down to the panel size of 1366x768 as these are physically incapable of displaying 1920x1080 resolutions

crosstownk

T-Square wrote: »

It means it can write one thousand and eighty lines in two passes, fifty times per second.

A better quality TV will have 1080p, which means it can write all 1080 lines to the screen in one passes. Not-interlaced.

You need 1080p @ 100Hz
which can write the image to all 1080 lines in one go, and do this 100 times per second.

Spot on. But it also depends on the source. A 1080p/100 is of no advantage if the input source is 1080i/50.

1080i/50 most likely refers to the input signal. Your TV will up/downscale it to it's native resolution if the TV's native is greater/less than 1080.

My TV receives a 1080i/50 signal, processes it as 1125i and then downscales it to 1280x768 which is the native resolution.

T-Square

crosstownk wrote: »

Spot on. But it also depends on the source. A 1080p/100 is of no advantage if the input source is 1080i/50.

1080i/50 most likely refers to the input signal. Your TV will up/downscale it to it's native resolution if the TV's native is greater/less than 1080.

My TV receives a 1080i/50 signal, processes it as 1125i and then downscales it to 1280x768 which is the native resolution.

Not sure anyone is selling a 100Hz signal. SkyHD is that 50Hz?

John mac

you can only get the 'Full hd ' 1080p signal from a Blu ray player,

Sky broadcast @1080i so no benefit on a 1080p set..

http://en.wikipedia.org/wiki/1080i has some more info..

.

mossym

T-Square wrote: »

s it can write all 1080 lines to the screen in one passes. Not-interlaced.

You need 1080p @ 100Hz
which can write the image to all 1080 lines in one go, and do this 100 times per second.

you don't "need" a 1080p @100hz..if that is the case you "need" a 1080p 200Hz tv which a refresh at twice the rate of a 100Hz tv. there are advantages and disadvantages to 100Hz scanning.

and i fyou hook up a blu-ray, to stop juddering you need to set the output of the player to 1080p24. as 24 isn't a multiple of 50hz, or 100hz, you still need some sort of frame rate adjustment to match up to the refresh rate so for blu-ray 100hz is as big a problem as 50hz..

for sky, they transmit at 1080i 50Hz, so the 100hz tv is just using the same frame and refreshing it wtice..

100hz can be a nice feature if implemented correctly (which it isn't in all tv's)..but it's far from a need to have feature. it can cause as many problems as it solves

Biro

mossym wrote: »

you don't "need" a 1080p @100hz..if that is the case you "need" a 1080p 200Hz tv which a refresh at twice the rate of a 100Hz tv. there are advantages and disadvantages to 100Hz scanning.

and i fyou hook up a blu-ray, to stop juddering you need to set the output of the player to 1080p24. as 24 isn't a multiple of 50hz, or 100hz, you still need some sort of frame rate adjustment to match up to the refresh rate so for blu-ray 100hz is as big a problem as 50hz..

for sky, they transmit at 1080i 50Hz, so the 100hz tv is just using the same frame and refreshing it wtice..

100hz can be a nice feature if implemented correctly (which it isn't in all tv's)..but it's far from a need to have feature. it can cause as many problems as it solves

Yep, it's amazing and annoying how we've slipped backwards a little with the 24p thing that's touted as a good thing. Why are they insisting that the cinema experience is the right one?

mossym

Biro wrote: »

Yep, it's amazing and annoying how we've slipped backwards a little with the 24p thing that's touted as a good thing. Why are they insisting that the cinema experience is the right one?

depends if you see it as a step back, 24 is to match up with film(the physical medium, not meaning movie here),which runs at that rate, so you're seeing the material as it was captured, so for some people(me included, have to say that) proper 1080p24 support is a very nice feature...

when you start talking sport and everything else then it's a different kettle of fish

slegs

John mac wrote: »

you can only get the 'Full hd ' 1080p signal from a Blu ray player,

Sky broadcast @1080i so no benefit on a 1080p set..

http://en.wikipedia.org/wiki/1080i has some more info..

.

Lots of devices can input to a TV at Full HD 1080p - not just bluray.

yuloni

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JamesTaylorfan

T-Square wrote: »

It means it can write one thousand and eighty lines in two passes, fifty times per second.

A better quality TV will have 1080p, which means it can write all 1080 lines to the screen in one passes. Not-interlaced.

You need 1080p @ 100Hz
which can write the image to all 1080 lines in one go, and do this 100 times per second.

Great informative reply...many thanks for that.:)

JamesTaylorfan

John mac wrote: »

means its receiving a 1080i signal at 50 hertz .

is that on sky hd?

Yes, it is Sky HD alright.

fat-tony

JamesTaylorfan wrote: »

Yes, it is Sky HD alright.

The HD signal from SKY/BBC/ITV is transmitted as 1080 lines interlaced, which means the odd numbered lines are sent (say line 1, 3, 5 etc.) as a field followed by the even numbered lines in the next field. This happens 50 times a second. It results in 25 complete frames each second. The interlacing is a hangover from older TV standards and it also reduces the bandwidth (space) needed to transmit the digital signal on satellite or terrestrial transmitters. Plasma or LCD TVs display the frames progressively - all the lines in one pass. The reference to 100Hz or 200Hz or higher is to do with the number of times the display is refreshed each second by the TV. My Panasonic plasma runs at 100Hz. If you switch it to 50Hz there is a slightly noticeable flicker if you look at the screen with your peripheral vision. Most good quality TVs will also handle 29 frames per second used in NTSC video, some will also support 24 frames per second used in some Blu-Ray film transfers to video.

T-Square

Condi wrote: »

This post has been deleted.

12Hz