TrueHD or Uncompressed? - Blu-ray Forum

AquaticGoat · 03-01-2008, 06:38 PM

If a movie has the option for both, which sounds better, TrueHD or Uncompressed?

JasonR · 03-01-2008, 06:39 PM

TrueHD is Uncompressed...

Do you mean PCM?

AquaticGoat · 03-01-2008, 06:40 PM

yes

Blu-ray Fanatic · 03-01-2008, 06:41 PM

What's DTS Master Audio?

crackinhedz · 03-01-2008, 06:49 PM

Quote:

TrueHD is Uncompressed...

Do you mean PCM?

..now now, I know you know better.

TrueHD is 'compressed'...but still Lossless.

crackinhedz · 03-01-2008, 06:51 PM

High-Def FAQ: Uncompressed vs. Lossless Audio

AquaticGoat · 03-01-2008, 06:52 PM

Quote:

Originally Posted by crackinhedz

..now now, I know you know better.

TrueHD is 'compressed'...but still Lossless.

So is there a discernable dfference between TrueHd and PCM?

JasonR · 03-01-2008, 06:52 PM

Quote:

Originally Posted by crackinhedz

..now now, I know you know better.

TrueHD is 'compressed'...but still Lossless.

Ooops, I should think before I speak next time...

crackinhedz · 03-01-2008, 06:54 PM

Quote:

So is there a discernable dfference between TrueHd and PCM?

technically speaking, no. When TrueHD is decoded it is converted back into PCM (Uncompressed).

But how your Receiver handles Linear PCM vs. Bitstream signals is a whole 'nother topic.

AquaticGoat · 03-01-2008, 06:56 PM

Quote:

Originally Posted by crackinhedz

technically speaking, no. When TrueHD is decoded it is converted back into PCM (Uncompressed).

But how your Receiver handles Linear PCM vs. Bitstream signals is a whole 'nother topic.

Thanks for your help.

crackinhedz · 03-01-2008, 06:57 PM

To basically answer your Question...try out both, and go with the one that sounds best to you.

And call it a day.

Theres no real clear winner, only debate. So to avoid the debate, just go with what you think sounds the best and you'll be happy.

crackinhedz · 03-01-2008, 06:58 PM

...real question is what bluray player and receiver combo do you have? is it connected with HDMI?

JimPullan · 03-01-2008, 06:59 PM

Geeeezzzz . . . . . How many times do we have to go over this ????

Dolby HD, Dolby Tru HD, DTS HD, and DTS HD Master Audio all all Lossless Audio Codecs - with compression. Where Linear PCM is Uncompressed Audio. All of these are in the Digital domain. All Audio is converted from digital to analog before it gets amplified. Only analog signals are reproduced by your speakers. Because the compression is less and the bandwith of the lossless audio is greater, it will produce a sound far better than what we've been listening too - ie: Dolby Digital and DTS.

The Movie Studios determine which Audio codec they'll use based upon disc capacity, and what suppliments they will be adding beyond the feature presentation. So, a 50gb. Blu-ray disc will allow for the better codecs or even the uncompressed audio, which is what's on the D2 master at the studio.

Does this information help ?

Jim

crackinhedz · 03-01-2008, 07:12 PM

Quote:

Dolby HD, Dolby Tru HD, DTS HD, and DTS HD Master Audio all all Lossless Audio Codecs - with compression.

Dolby Digital Plus and Dts-HD High Resolution are 'Lossy' compressed codecs...not Lossless.

...but would anyone notice any difference? probably not.

JimPullan · 03-01-2008, 07:20 PM

Quote:

Originally Posted by crackinhedz

Dolby Digital Plus and Dts-HD High Resolution are 'Lossy' compressed codecs...not Lossless.

...but would anyone notice any difference? probably not.

Hmmm . . . very interesting! My understanding has been that standard Dolby Digial and standard DTS are 'lossy' and the Advanced Audio Codes are 'lossless', and finally Linear PCM is totally uncompressed Audio.

I would like to read 'absolute' evidence that I am incorrect, with links to the experts. If your so certain, please provide documentation supporting your position. Thanks !!!

Jim

JasonR · 03-01-2008, 07:23 PM

http://en.wikipedia.org/wiki/Lossless_data_compression

No DTS-HD or DD+ listed.

crackinhedz · 03-01-2008, 07:24 PM

Dtsonline.com

Blu-ray and HD-DVD: Packaging Guidelines

"For DTS-HD High Resolution – "Lossy" Encodes...At a minimum, use this logo (including the ™) for packaging and inserts for all content that is encoded in DTS-HD High Resolution Audio ("Lossy") bit-streams."

www.dtsonline.com/media/DTS-HD_WhitePaper.pdf

"DTS-HD High Resolution Audio offers a "lossy audio stream" with 7.1 channels and ..."

crackinhedz · 03-01-2008, 07:26 PM

Dolby Digital Plus 1.5Mbps bitrate speaks for itself.

JimPullan · 03-01-2008, 07:40 PM

Thanks Crackinhedz for the links. Cool !!!

Though most consumers will not be able discern the differences, it is good to know, especially for someone, like myself, who recommends and sells this stuff. The audio side is most confusing even for us in the profession. Again, thanks !!! [Jim]

lildon24 · 03-01-2008, 07:48 PM

Sound Codecs Quality

Ultimate -Uncompressed

Superior- Dolby TruHD & DTS-MA

Best- Dolby Digital Plus & Dts-HR

Very Good- DTS-ES Discrete 6.1

Good- Dolby Digital 5.1 & DTS 5.1

Poor- Dolby Stereo

Worst- Mono "sometime old classic movies sound good"

03-01-2008, 06:38 PM	#1
AquaticGoat Member Member since:Jul 2007 Location:Alaska Blu-ray reviews:3	TrueHD or Uncompressed? If a movie has the option for both, which sounds better, TrueHD or Uncompressed?

03-01-2008, 06:59 PM	#13
JimPullan Senior Member Member since:Jun 2006 Location:Ocala, FL	Audio Codecs 101 Geeeezzzz . . . . . How many times do we have to go over this ???? Dolby HD, Dolby Tru HD, DTS HD, and DTS HD Master Audio all all Lossless Audio Codecs - with compression. Where Linear PCM is Uncompressed Audio. All of these are in the Digital domain. All Audio is converted from digital to analog before it gets amplified. Only analog signals are reproduced by your speakers. Because the compression is less and the bandwith of the lossless audio is greater, it will produce a sound far better than what we've been listening too - ie: Dolby Digital and DTS. The Movie Studios determine which Audio codec they'll use based upon disc capacity, and what suppliments they will be adding beyond the feature presentation. So, a 50gb. Blu-ray disc will allow for the better codecs or even the uncompressed audio, which is what's on the D2 master at the studio. Does this information help ? Jim

03-01-2008, 07:24 PM	#17
crackinhedz Super Moderator Member since:Feb 2007 Home Theater Gallery:10 Blu-ray reviews:8 Trading Score:19	Dtsonline.com Blu-ray and HD-DVD: Packaging Guidelines "For DTS-HD High Resolution – "Lossy" Encodes...At a minimum, use this logo (including the ™) for packaging and inserts for all content that is encoded in DTS-HD High Resolution Audio ("Lossy") bit-streams." www.dtsonline.com/media/DTS-HD_WhitePaper.pdf "DTS-HD High Resolution Audio offers a "lossy audio stream" with 7.1 channels and ..." Last edited by crackinhedz; 03-01-2008 at 07:30 PM.

03-01-2008, 07:48 PM	#20
lildon24 Active Member Member since:Jun 2007 Location:Why you wanna know? Blu-ray collection:47 Blu-ray reviews: 39	My idea of sound quality Sound Codecs Quality Ultimate -Uncompressed Superior- Dolby TruHD & DTS-MA Best- Dolby Digital Plus & Dts-HR Very Good- DTS-ES Discrete 6.1 Good- Dolby Digital 5.1 & DTS 5.1 Poor- Dolby Stereo Worst- Mono "sometime old classic movies sound good"

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03-01-2008, 06:39 PM	#2
JasonR Super Moderator Top contributor Member since:Nov 2007 Trading Score:12	TrueHD is Uncompressed... Do you mean PCM?

03-01-2008, 06:40 PM	#3
AquaticGoat Member Member since:Jul 2007 Location:Alaska Blu-ray reviews:3	yes

03-01-2008, 06:41 PM	#4
Blu-ray Fanatic Blu-ray Ninja Member since:Aug 2007 Location:San Antonio Blu-ray reviews:1	What's DTS Master Audio?

03-01-2008, 06:51 PM	#6
crackinhedz Super Moderator Member since:Feb 2007 Home Theater Gallery:10 Blu-ray reviews:8 Trading Score:19	High-Def FAQ: Uncompressed vs. Lossless Audio

03-01-2008, 06:57 PM	#11
crackinhedz Super Moderator Member since:Feb 2007 Home Theater Gallery:10 Blu-ray reviews:8 Trading Score:19	To basically answer your Question...try out both, and go with the one that sounds best to you. And call it a day. Theres no real clear winner, only debate. So to avoid the debate, just go with what you think sounds the best and you'll be happy.

03-01-2008, 06:58 PM	#12
crackinhedz Super Moderator Member since:Feb 2007 Home Theater Gallery:10 Blu-ray reviews:8 Trading Score:19	...real question is what bluray player and receiver combo do you have? is it connected with HDMI?

03-01-2008, 07:23 PM	#16
JasonR Super Moderator Top contributor Member since:Nov 2007 Trading Score:12	http://en.wikipedia.org/wiki/Lossless_data_compression No DTS-HD or DD+ listed.

03-01-2008, 07:26 PM	#18
crackinhedz Super Moderator Member since:Feb 2007 Home Theater Gallery:10 Blu-ray reviews:8 Trading Score:19	Dolby Digital Plus 1.5Mbps bitrate speaks for itself.

03-01-2008, 07:40 PM	#19
JimPullan Senior Member Member since:Jun 2006 Location:Ocala, FL	Thanks Crackinhedz for the links. Cool !!! Though most consumers will not be able discern the differences, it is good to know, especially for someone, like myself, who recommends and sells this stuff. The audio side is most confusing even for us in the profession. Again, thanks !!! [Jim]

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