Hi Def/Blue-ray

[admin_exported]

Is there an improvement from ordinary HD to Blue-Ray. As I understand it, blue-ray is simply the equivalent of HD. So if Save to sky's 1TB hard drive isn't the play back exactly the same as blue ray? Thanks

 

[nads]

ordinary HD is 720p or 1081i while Blu/HD DVD "Full HD" is 1080p yes there is a difference. not to mention the sound tracks.

 

[AlmaataKZ]

As far as I undertand the max resolution brodcaseted on TV:
picture: 1080i (that is 1080 horisontal lines but only every second one shows at a time, thus called 'interlaced')
Sound: 5.1 encoded in a lossy compressed codec

Every broadcast system/channel has its own picture and sound quality/availability.

Bluray disc/player can play:
picture: 1080p (that is 1080 horisontal lines in every frame)
sound: 7.1 channels, 24bit/96khz (or is it 192?) in each channel (in several surround hd standards) i.e. lossless (?)

so, yes, there is an improvement availalble with blu ray for both picture and sound, subject to content actually containing it and hardware (bd player, av receiver, tv) being able to play it.

 

[Anonymous]

It is true Bd can Support 24bit/192KHZ, but all movies i have seen where in either 24bit/48KHZ or 16bit/48Khz, that pointed out the uncompressed audio is far better then the standard audio.

 

[fayeanddavid]

All the preceding is basically correct

BD movies are mostly 1080p/24fps (if your display can accept) as originally filmed, gives improved motion and stability.

Sound is a big step up as DTS HD MA bit rate is in excess of 5Mbs (variable) as opposed to standard DVD DTS of approx 640kbs, greater headroom, almost lossless sound

Hope this helps

 

[professorhat]

It's not just a difference in resolution and interlacing vs progressive picture, but also compression. HD channels on Sky, Freesat, Freeview HD etc. have far lower bitrates than a Blu-Ray - broadcast channels in the UK are around 9 - 15 Mbps, whereas Blu-Rays are in the 30 - 40 Mbps region and this results in a much better picture.

 

[fayeanddavid]

professorhat:
It's not just a difference in resolution and interlacing vs progressive picture, but also compression. HD channels on Sky, Freesat, Freeview HD etc. have far lower bitrates than a Blu-Ray - broadcast channels in the UK are around 9 - 15 Mbps, whereas Blu-Rays are in the 30 - 40 Mbps region and this results in a much better picture.

professorhat

spot on as usual, and in typical anorak style I have being leaving the info bar up on the S370 looking at bit rates for picture and sound.

It is quite staggering just how much information (in Mbps) is processed in our quest for perfection in both PQ and SQ