Whenever i watch moving sport especially football I experience much poorer pictu
Brian Butterworth published on UK Free TV What you are seeing is one of the two problems that are well know about the "MPEG-2" system that is used to encode digital TV.
Because of the way the system works, horizontal movement across a crowd requires a disproportionate large amount of data to encode.
Because the bandwidth on Freeview is so limited, and as most broadcasters have decided to have more channels rather than better quality pictures, on most channels the bandwidth is so limited that the effect you see, a blurry mass of blocks is visible.
The sceptical will say that this is simply an excuse to sell you HDTV equipment and channel packages.
The other problem you will see is when strobe effects are used - this will often look like very large black and white boxes.
If these effects trouble you, do not go out and buy yourself a massive TV as they will be simply much clearer to you.
Thursday, 27 October 2011
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David Harold Constantine9:20 PM
Brian
Tks for reply.Yes, using HDMI cable. Is it possible that Dish needs realigning inspite of displayed 100% signal and quality ??
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Friday, 28 October 2011
David Harold Constantine: No, do not move your dish. As a digital service the signal quality cannot effect the picture. Please see How digital television works | ukfree.tv - independent free digital TV advice .
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Friday, 1 November 2013
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Rex Eady3:02 PM
Wisbech
I have a 32 element digital TV aerial fitted on a mast on the roof. On normal digital channels (NON-HD) the picture is fine, but as soon as I try and watch in HD I get "blocking" on the picture, which at times makes watching in HD impossible. Do you have to have a special kind of aerial to watch Freeview HD? - and if so what is it. We use the Sandy heath transmitter.
Thanks.
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Rex's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
Rex Eady: No, and aerial is an aerial. It isn't specifically designed for receiving analogue, digital, high definition or whatever, but it is the frequency of the signals in question which dictate its design.
If this has only started to happen recently then be aware that there are engineering works going on at Sandy Heath.
For BBC One HD check that you are tuned to Sandy Heath on UHF channel 21 (474MHz). Observe the strength and quality when it's good and when it's not so good.
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Monday, 24 November 2014
J
John matthews12:47 PM
I am at NG228FE. HD channel 58 from Waltham has all but dissapeared It has been reliable since it started but now the signal condition quality is just above zero. Certainly can't use the programme guide to effect a recording as it is likely that it will result in a blank screen. Have tried a manual retuned but to no avail.
Is it the weather ?
Strange that the Orange mobile phone signal has weakened too.
John M.
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Monday, 9 May 2016
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nicholas9:34 AM
Hi,re comments on blocking,this isnt what you're led to believe,This is delibrate noise added to persuade
you to purchase the high end stuff,its called Expander noise,used in vhs videos for copying reasons,what
happens is a diode connected to the power lines creates noise which can be modified by the manufacter,to
create what they want.So when you watch football,you see like a ghost trailing behind.
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Monday, 10 October 2016
D
derek gill1:49 PM
what's the difference between 1080p and 1080i.thank's.
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Tuesday, 11 October 2016
MikeP
10:56 AM
Bungay
10:56 AM
Bungay
derek gill:
1080p is a system of progressive scanning in the vertical direction. It means that each adjacent horizontal line making up the picture is sent immediately after the previous one directly above it.
1080i means the picture is interlaced, that is where each alternate line is transmitted until the screen area has been covered by half the number of lines need. Then the other lines in between those already sent are transmitted to fill in the spaces.
Interlaced display was how the 'old' 405 and 625 line analogue transmissions were sent out. Currently, digitally encoded transmissions such as Freeview are sent out as progressive scan. The advantage of progressive is that there is little, if any, flicker and the screen refresh rates can be faster. It is generally considered that progressive gives a better viewing experience.
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MikeP's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
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nicholas12:17 PM
I'm sorry everybody,there is misinformation about this matter,this is DELIBERATE electronic noise added to
the video output of many devices to spoil the picture and try deter copying and also encourage you to
buy the HD version,you can see the effects on utube videos and noticeable particulary on football,where
a ghost outline follows the players.Its used in VHS videos for copyright purposes and basically its called
<expander noise>,from a diode connected to the power rails which provides noise,it is modified to suit
the purpose,<blocking> patterns are quite common,as stated,its a way to make you buy the HD version,no
more,no less.This is per my earlier post,secondly ,the freeview bandwidth isn't restricted,its a lie to make
you buy HD equipment.Its like
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M
MikeB3:01 PM
nicholas: You've told us before...but nobody uses VHS anymore. Of course tinfoil would block out the signals....
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