WEBVTT

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if you subscribe to a cable or satellite TV service chances are there's a toggle

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somewhere on your set top box that allows you to switch between 720p or

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1080 I but you've also probably noticed

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that most TVs and monitors advertise

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themselves as 1080p these days which doesn't match up with either of those so

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what gives you see that P you always see

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at the end of 1080p stands for

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Progressive and no I'm not talking about the insurance company or Bernie Sanders

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I'm talking about progressive scan which means it will draw all of the lines in a

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single frame of video sequentially so that each frame contains a complete

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image that fills the screen by contrast

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the little I stands for interlaced in

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which only every other line of an image

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is displayed in one frame interlaced

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signals are common not only for 1920x 1080 TV channels but they were also

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dominant back in the day of analog television where almost everyone was

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watching at 480i or 576i on CRT

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displays but why wouldn't it be more

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straightforward to display one whole image per frame well part of the reason

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was bandwidth you see only so much much

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data can be flung over the airwaves or a

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co-axial cable at Once interlaced video

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saves on bandwidth by only sending half of a complete frame at once this allowed

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older TV sets to refresh more frequently

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for smoother motion as they could show 60 half frames per second instead of 30

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full frames but modern LCD flat panel

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TVs only support Progressive scanning so

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how do they work then with interlaced 108i signals provided by cable or

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satellite TV services well the signals

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have to be what is called deinterlaced this can be done by either

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the set top box or the TV itself but

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either way it's an imperfect science you

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see the two halves of a fully interlaced

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frame aren't two halves of the exact

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same image rather they are usually

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delivered as the halves of two separate slightly different frames so when you

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put them together they don't look quite perfect and on lowquality displays this

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can show up as what's called combing in places where the two half frames don't

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match up very well TVs use processing

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tricks to help avoid really bad artifacting in deinterlaced video and

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generally it works fairly well on displays that are worth their salt and

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although many cable boxes can also de interlay signals it's typically a better

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idea to let your TV do it as cable boxes are all too often made by the lowest

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bidder and the de interlacing logic inside them won't be as good as what

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your tv offers but even with a nicer TV

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it can still be possible to notice a reduction in picture quality when

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there's rapid movement on screen such as if you're watching a sporting event

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because two half frames in sequence

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during something like a hockey game can be way out of sync due to the fast

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motion of the players many sports networks like ESPN have actually chosen

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to broadcast in 720p instead of 108i sacrificing

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resolution for better movement but come

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on lonus this is 2016 why do we have to

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sacrifice anything well due to the cost

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of upgrading systems as well as the fact that most Bourgeois viewers seem to be

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content with 1080i service we probably won't see real 1080p at 60 frames per

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second over cable and satellite anytime soon however the good news is that

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computers have no problem outputting 1080p signals so if you're one of the

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many folks who are constantly using their rigs for everything from gaming to

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watching Netflix in HD or even 4K you won't have to worry about interlacing

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artifacts yet another reason to join the PC Master raced just make sure that you

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the Subscribe button is let's get this show on the road