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Reader Comments (Page 1 of 1)
SimbaDogg @ Apr 26th 2007 7:56PM
ok....heres one thing that i dont understand, maybe someone can clue me in here. The main difference between the DTS and Dobly Digital formats of years past was the amount of compression that was basically put on the audio mix itself. That was, if my thinking is correct, the primary difference between the two formats. Now that we have the storage capabilities to do completely lossless audio, with no compression...why is there still a DTS-HD and DOBLY-HD. if my reason is faulted please someone let me know...
bfdtv @ Apr 26th 2007 9:31PM
"Now that we have the storage capabilities to do completely lossless audio, with no compression...why is there still a DTS-HD and DOBLY-HD. if my reason is faulted please someone let me know..."
The link provided by engadget explains it.
But simply said, there isn't space to provide "completely lossless audio, with no compression" on most disks. Completely lossless audio for all modern films is 24-bit, 48kHz. But there isn't space for that on most disks used today. So what do studios do? They "downres" the 24-bit, 48kHz LPCM master track to 16-bit, 48kHz LPCM. It's still uncompressed audio, but it's no longer lossless compared to the master. It's lossy.
TrueHD and DTS-HD MA are lossless compression codecs -- like zip files -- which are used to "zip" the 24-bit, 48kHz LPCM so it can fit on every disk. That eliminates the need to "downres" the audio to lower / lossy resolution.