Zenien
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This is the best I could find about explaining PCM, it's from IGN.
Uncompressed PCM 5.1: Found on a large number of Blu-Ray discs but not supported on HD-DVD, uncompressed PCM 5.1 is simply that: an uncompressed version of the film’s standard 5.1 to 7.1 soundtrack. While that doesn’t sound too exciting, believe me when I say PCM 5.1 is a joy to hear. I’ll post my own experiences in a second, but here’s what many reviewers of BD and HD-DVD discs have to say about PCM audio:
”Buena Vista continues to aggressively support uncompressed PCM soundtracks on its Blu-ray releases, and I say cheers to that. With so much talk about new audio formats such as Dolby TrueHD and DTS-HD (which are indeed great, make no mistake), it is easy to forgot that plain ol' PCM can produce some the best sound around.”
”If you haven't heard uncompressed PCM you really don't know what you're missing. I haven't heard anything from DD, DD+, True HD or even DTSHD quite on the same level. Of course the later can currently only be based on hearing the core DTS on DTS MA tracks from Fox. And I'm not convinced that the TrueHD tracks that I've heard were the best the codec can do. Regardless, PCM has delivered the most transparent audio presentations I've ever heard even at 16bit. It's like listening directly to the master tapes. Or so I imagine.”
” Buena Vista rolls out the red carpet with an uncompressed PCM 5.1 surround track at 48kHz/16-bit. What impressed me most were the quietest moments...'Flightplan' definitely delivers some of the best atmosphere I've heard yet on a Blu-ray release.”
” I have little doubt that the uncompressed PCM 5.1 surround track on this disc easily stands shoulder-to-shoulder with the best soundtracks I've heard on either next-gen format.”
”PCM again lives up to the hype, preserving a broad, open transparency with newfound detail and clarity that DVD just can't touch.“
While DD5.1 tracks for DVDs have been compressed to fit, PCM audio allows them to breathe. It’s like listening to an MP3 you downloaded off Limewire & then listening to the same track on the original CD. Another comparison would be listening to a movie with earmuffs on, and PCM audio taking those muffs off, allowing you to hear subtle details like the rain pitter-pattering on the windshield, the hum of an elevator as it moves upwards...if you think I’m exaggerating, believe me, I’m not. It’s incredible how much uncompressed PCM turns your room into a living, breathing environment. It’s almost like going from 5.1 to 20.1.
http://blogs.ign.com/chubigans/2006/12/29/41597/
Uncompressed PCM 5.1: Found on a large number of Blu-Ray discs but not supported on HD-DVD, uncompressed PCM 5.1 is simply that: an uncompressed version of the film’s standard 5.1 to 7.1 soundtrack. While that doesn’t sound too exciting, believe me when I say PCM 5.1 is a joy to hear. I’ll post my own experiences in a second, but here’s what many reviewers of BD and HD-DVD discs have to say about PCM audio:
”Buena Vista continues to aggressively support uncompressed PCM soundtracks on its Blu-ray releases, and I say cheers to that. With so much talk about new audio formats such as Dolby TrueHD and DTS-HD (which are indeed great, make no mistake), it is easy to forgot that plain ol' PCM can produce some the best sound around.”
”If you haven't heard uncompressed PCM you really don't know what you're missing. I haven't heard anything from DD, DD+, True HD or even DTSHD quite on the same level. Of course the later can currently only be based on hearing the core DTS on DTS MA tracks from Fox. And I'm not convinced that the TrueHD tracks that I've heard were the best the codec can do. Regardless, PCM has delivered the most transparent audio presentations I've ever heard even at 16bit. It's like listening directly to the master tapes. Or so I imagine.”
” Buena Vista rolls out the red carpet with an uncompressed PCM 5.1 surround track at 48kHz/16-bit. What impressed me most were the quietest moments...'Flightplan' definitely delivers some of the best atmosphere I've heard yet on a Blu-ray release.”
” I have little doubt that the uncompressed PCM 5.1 surround track on this disc easily stands shoulder-to-shoulder with the best soundtracks I've heard on either next-gen format.”
”PCM again lives up to the hype, preserving a broad, open transparency with newfound detail and clarity that DVD just can't touch.“
While DD5.1 tracks for DVDs have been compressed to fit, PCM audio allows them to breathe. It’s like listening to an MP3 you downloaded off Limewire & then listening to the same track on the original CD. Another comparison would be listening to a movie with earmuffs on, and PCM audio taking those muffs off, allowing you to hear subtle details like the rain pitter-pattering on the windshield, the hum of an elevator as it moves upwards...if you think I’m exaggerating, believe me, I’m not. It’s incredible how much uncompressed PCM turns your room into a living, breathing environment. It’s almost like going from 5.1 to 20.1.
http://blogs.ign.com/chubigans/2006/12/29/41597/