High-Def FAQ: Uncompressed vs. Lossless Audio

Joshu Zyber writes, "A couple of months ago, I wrote a column called Blu-ray and HD DVD Audio Explained that spelled out the basic functions, features, and differences among the various audio formats available on both High-Def disc types. In it, I explained that uncompressed PCM audio (as found on many Blu-rays) is an exact replication of the studio master, encoded on disc without compression, and that the lossless audio formats Dolby TrueHD and DTS-HD Master Audio are also bit-for-bit identical to the studio master once decoded. Doing the math, that should mean that a lossless track is also identical to an uncompressed track. Indeed, that is the case. However, some confusion remains as to whether an uncompressed track is actually better than a lossless one."

"The number of new audio formats on Blu-ray and HD DVD have caused a great deal of consumer confusion, especially with three separate formats (PCM, Dolby TrueHD, and DTS-HD Master Audio) all designed to accomplish the exact same goal -- a perfect replication of the movie's audio master. Apprehensions about lossless compression being inferior to an uncompressed version of the same soundtrack are not borne out by the facts. One methodology may have technical advantages over the other in terms of space savings, but the end result is the same whether the disc you buy has an uncompressed soundtrack or a lossless one. They're both equally good, so sit back and enjoy."

Read Full Story >>
The story is too old to be commented.
Lord Anubis3754d ago

what a waste of time reading absolutely nothing but a person going in circles to justify D true-HD. Uncompressed carries the true track while the others drop what they call white noise to reduce the size of the track.

jaja14343754d ago

See your comment alone tells me you didn't read the article. Had you actually read it you would know thats not how this type of audio compression actually works.

What you said is basically how an mp3 works and to a lesser extent a wav. Perhaps next time a quick read would be better?

blackmagic3753d ago (Edited 3753d ago )

I think you are confusing the section on lossy compression with lossless compression. The whole point of lossless compression is being 'lossless' in other words identical to the original sample. As he points out in the article, the Linear PCM track or Lossless track could still be a downsampled 16 bit version of the master audio for various reasons from disc space issues to the Master not being a high enough quality to begin with as is the case in many older movies. Joshua Zyber is an exceptional columnist in the industry.

power of Green 3754d ago (Edited 3754d ago )

Who cares really... Sold my HD-A2 because I found out I'm getting a HD-A35 for Xmas. I have a Yamaha HTR-5940 AV Recever with an BIC Venturi DV62CLR-S 6.5” 2-Way Center Channel Speaker with two sets of
Bose Acoustimass 5 Series III Speakers for surround sound.

My system's hardly a sound setup that has me worried about the content of this post as if I know what it all means. All I no is I do not have $10,000 tower speakers etc as my set up is average.

green3754d ago (Edited 3754d ago )

same here.i will just get the HD-DVD add on for the 360.HD-DVD is cheep and i don't have the financial power yet to buy a PS3 because i want to watch HD movies.Its just storage space that is the difference.And i like hd-dvd feature of making dvd on one side and hd-dvd on the other so even if hd-dvd fails i wouldn't have lost much because my movies will still play on a regular DVD.

IGNFTW3754d ago


jaja14343754d ago

Playing Guitar Hero does not mean you make music. :)

jaja14343754d ago

Interesting read. I already learn most of that this semester when we studied compression techniques, but still very Interesting.

Now will this stop the "loss less is worse than..." crap that goes on in the HD vs BR threads?

ITR3754d ago

Read the new Harry Potter movie review on HD Digest..the reviewer basically says I can't tell the difference between the two.

Show all comments (20)
The story is too old to be commented.