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Old 02-28-2008   #341
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kloneman's Avatar
Join Date: Jan 2008
Location: Fort Worth, TX
Posts: 161
Default Re: HD DVD about to fight back...

An interesting excercise:

if 8 ch of 24 bit uncompressed audio sampled at 192 Khz were combined with 3 channels of 16 bit "deep color" video updated at double rate 120 Hz, the raw audio and video bandwidth needed would be:

[Horizontal x Vertical Resolution x number of colors/pixel x bits/color x updates/sec ] + [Audio channels X audio bit depth/channel x audio updates/sec)

[1920 x 1080 x 3 x (16) X (60 or 120)] + [(8) X 24 X (192,000)]

~=[(11.94 Gbits/sec (video)) + (36.9 Mbit/sec (audio))]

That's killer (Its massive even if the video were updated at 60 Hz and the audio were only sampled at 96Khz (grin))!!!

Originally Posted by DaViD Boulet View Post
Your point is moot. Average bit-rate isn't the key issue here: Peak-bit-rate is also important for high-action scenes and most every BD I own from Disney shows video bit-rates that routinely peak above HD DVD's limit.

And besides the simple issue of video max-bit-rate, there's the whole spectrum of signals that share the read-bandwidth. Blu-ray Disc is much better able to deliver optimal video *and* lossless audio and additional features like PIP that all need to share the same bandwidth pipe. It's not just about video rates, it's about the interaction of every signal that needs to share the bandwidth space.
- Kloneman --

Last edited by kloneman; 02-28-2008 at 11:08 PM..
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