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View Full Version : what a con sky hd



vincewrd
03-04-2007, 08:31 PM
i got a 1080p lcd then i ordered sky hd ?300 as i was told it put out 1080p and it dont at all. it only does is 1080i does any body know if i would be able to tell the diffrence between 1080i and 1080p thanks im in two minds to cancel the sky

[IG]Mart
04-04-2007, 10:49 PM
Don`t think there is that much diffrence.

seamouse
05-04-2007, 04:27 PM
1080i vs 1080p

To compare 1080i and 1080p it is important to compare framerates. Due to interlacing 1080i has twice the frame-rate but half the resolution of a 1080p signal using the same bandwidth. This is especially useful in sport-shows and other shows with fast-moving action. However, on some flat screens that don't support interlacing, this instead becomes smeared or jarred artifacts.

Current digital television broadcast systems and standards are not equipped for 1080p50/60 transmission. Also, the majority of consumer televisions offered for sale are currently not equipped to receive or decode a 1080p signal at any frequency. It is less bandwidth-intensive to broadcast a film at 1080p24 than 1080i30, since 20% less data would be transferred. In addition, when the source material is 24 frames per second, as are most films, it would be easy to convert a 1080p24 broadcast to an NTSC 1080i30 format using a 3:2 pulldown process (see telecine). Moreover, displaying a p24 broadcast on an i50 system (such as PAL) requires the speed of video and audio be increased by over 4% (to 25 frames per second).

For movies the frames (25 or 30 per second) are segmented into two interlaced fields with equal time index (psf, progressive in or with segmented frames). The deinterlacer has to perform a simple weave only. This ensures compatibility with 1080i25/30 with only little less coding efficiency than 1080p25/30 and half the bandwidth requirement of 1080p50/60, but the SDTV problems of PAL speed-up and Telecine judder remain.

It is less efficient to transmit any signal with a frame rate significantly higher than that of its source, which is 24fps for films; however, frame differencing in the compression standards used for HDTV transmission greatly reduce the wasted bandwidth in these cases.

mac001
06-04-2007, 01:47 AM
Seamouse has given a very comprehensive replay to the differences to 1080p and 1080i.

Until recently, I had Telewest/Virgin cable with the one BBC HD channel. Look great but very little content.

I would interested to know if SkyHD was any better.

seamouse
06-04-2007, 09:28 AM
well its werid that itv hd has gone, but have been told there is loads off hd on demand, but i dont wanna pay for it,

seamouse
06-04-2007, 10:08 AM
well lookign at more demand today on virgin,

there is movies, bbc hd and 4 hd, playing some shows