HD & Blue Ray discs

[ruthie]

I have been trying to find some technical information on the above subject as I am doing a case study for a college course and am finding it incredibly difficult to find the in depth information I need. So, I was wondering if anybody out there would be able to point me in the right direction. Firstly I need to know about the different codecs used for compression on HD & BD. I am also struggling to find any technical information on the signal flow between the laser and the disc, how the information is written and retrieved, i have the basics re the pits and the layers but i need to obtain a deeper level of information, which i don't truly understand myself. If anyone can help me I would be soo grateful as I am very confused at the moment.

[alsenior]

i think some of the information you need is under license and would be hard to get hold of without paying a large license fee and a NDA. i might be wrong though a good place to start might be the Doom9 forums. the people on there have alot more experience with that type of stuff than on here.

[peterb]

A quick Google showed this (fairly old) link

Disclosure of Specifications for Large Capacity Optical Disc Recording Format Utilizing

which said that the specification costs $5,000 and is subject to signing an NDA - I suspect HD will be similar - although a (very) quick Google didn't throw up anything obvious.

However it did throw up this

Blu-ray and HD-DVD - What You Need To Know About The Blu-Ray and HD-DVD High Definition DVD Formats

which gives some background info, although probably not detailed enough for you.

I thgink you are in for a fair bit of Googling, and also search through the specialised technical press and databases. Possibly the IETE INSPEC database may have some information, if your college has a subscription to it.

It depends to what depth you need to go - lasrter wavelengths, multi-layer recording technology etc. The principles are pretty much public domain, the detail may not be.

[directhex]

the video codecs are mpeg2, h264 (mpeg4 part 10) and vc-1 (windows media). these are used by BOTH formats

for audio, blue ray REQUIRES support for ac3 (dolby digital), dts, or lpcm (uncompressed) and may additionally optionally support dolby digital plus, dolby truehd, and dts hd, or dts master audio as additional audio tracks. all discs need to include one mandatory codec as minimum

for audio, hd-dvd REQUIRES support for ac3 (dolby digital), dts, lpcm (uncompressed), dolby digital plus, or dolby truehd and may additionally support tds hd or dts master audio as additional audio tracks. all discs need to include one mandatory codec as minimum

[Funkstar]

yeah try the following:

AVForums Home
Doom9.net - The Definitive DVD Backup Resource

And obviously you have looked at:
Blu-ray Disc - Wikipedia, the free encyclopedia
and
HD DVD - Wikipedia, the free encyclopedia

I know a lot (perhaps most) Universities, Collages and schools don't let you use Wikipedia as a source, but it is good for background and there are always the sources and reference links from those pages.

[ruthie]

hi thanks for your input will give it a go.

[Mit321]

btw Blue Ray is spelt Blu-ray quite a fundamental thing lol

[ruthie]

Yes I realised it after I posted it well done.

[ruthie]

thanks very much for your reply thats great.