DTS-HDMA vs. Uncompressed PCM - Page 3 - Blu-ray Forum

Luis_A51 · 04-10-2008, 07:21 PM

PCM should sound the same as DTS-MA.

It has ABSOLUTELY NOTHING to do with the speakers/receiver you have (assuming the player does the decoding).

The only time they will sound different is if the audio engineer mixes the DTS-MA in a weird way. But technically speaking, they should be identical.

Remember, PCM is THE reference audio track. There is nothing better than pure PCM.

Luis_A51 · 04-10-2008, 07:22 PM

Quote:

Originally Posted by Memnoch

I have one of the first 605s to hit the market WAY back with they were up for preorder. I am pretty sure I don't have the newest firmware update for the 605. I was under the impression that the firmware update fixed some decoding issues with this DTS-HDMA stuff so I was going to wait until the PS3 could actually bitstream DTS-HDMA to the receiver to bother upgrading it. So since we are getting that capability in a week, do I need this upgrade?

PS3 wont bitstream. It will send it as PCM.

Pelican170 · 04-10-2008, 07:22 PM

Quote:

Originally Posted by DutchBoy

I'm not technically minded enough to understand all of the inner workings of it, but I don't see why this wouldn't be possible (and by the way, this is how I understand it to work too).

If it's taking the TrueHD or DTS-HD and converting it, sound for sound, to another format (PCM), it's going to sound exactly the same as before the convert.

That's why receiver's getting those codecs from the PS3 don't show "TrueHD" or "DTS-HD" on their screens -- they're getting PCM signals from the PS3 that are identical to the original codecs that have been converted.

Now I'M confuseded...

hahaha, im begining to confuse myself. If the signal is sent PCM, the receiver will show PCM not dolby because it is already decoded and the receiver isnt touching the signal. Ive tried this with regular Dolby Digital, if you do this where the PS3 is set to LPCM, the receiver still says Multichannel PCM, if you switch that to bitstream, the receiver will change to show DD.

Sith · 04-10-2008, 07:23 PM

yeah but don't you need a receiver with hdmi in, i thought that uncompresed
audio couldn't be transmitted thru a optical cable?

DutchBoy · 04-10-2008, 07:24 PM

Quote:

Originally Posted by Sith

so is all you need to get truehd and dtshdma a receiver that has a hdmi in....

Please help, i am ready to buy some new equipment for my birthday...

Can't just use any HDMI receiver. Not all of them handle HDMI audio.

Make sure you get one that can handle PCM audio, and you'll be set.

ClaytonMG · 04-10-2008, 07:24 PM

Quote:

Originally Posted by Sith

so is all you need to get truehd and dtshdma a receiver that has a hdmi in....

Please help, i am ready to buy some new equipment for my birthday...

As long as it accepts PCM, it should work. And make sure you get one that accepts 7.1 PCM. There's a few that only accept 5.1 which isn't that big of a deal, but there are a couple (I think only from New Line and Lionsgate) titles out there that have DTS-HDMA/HR 7.1 tracks.

un4gvn94538 · 04-10-2008, 07:24 PM

Quote:

Originally Posted by Sith

yeah but don't you need a receiver with hdmi in, i thought that uncompresed
audio couldn't be transmitted thru a optical cable?

with a ps3, yes. other players can output the same with 5.1 or 7.1 analog outs to a receiver with analogs in.

Sith · 04-10-2008, 07:24 PM

Quote:

Originally Posted by Pelican170

hahaha, im begining to confuse myself. If the signal is sent PCM, the receiver will show PCM not dolby because it is already decoded and the receiver isnt touching the signal. Ive tried this with regular Dolby Digital, if you do this where the PS3 is set to LPCM, the receiver still says Multichannel PCM, if you switch that to bitstream, the receiver will change to show DD.

this can be confusing as F***

Luis_A51 · 04-10-2008, 07:24 PM

Quote:

Originally Posted by Pelican170

I dont agree with this either. How is the ps3 going to decode the DTS-HDMA, then convert it to a Uncompressed PCM file, then decode that then send? If you look, press select when LPCMing DD True HD. Its shows what is being decoded and sent via pcm to the receiver. It will say DD True HD, which is what is being heard. If im wrong, please explain...

PCM is uncompressed sound. DTS-MA and TrueHD are encoded versions of PCM.

Therefore the PS3 decodes the PCM signal from DTS-MA/TrueHD and sends it to the receiver as PCM. The receiver then plays that PCM signal.

CptGreedle · 04-10-2008, 07:24 PM

Quote:

Originally Posted by Sith

so is all you need to get truehd and dtshdma a receiver that has a hdmi in....

Please help, i am ready to buy some new equipment for my birthday...

No... the PS3 can not bitstream DTS-HD MA or TrueHD to a receiver. Your receiver does not have to be able to handle them either. The PS3 will decode it.

Sith · 04-10-2008, 07:25 PM

Quote:

Originally Posted by un4gvn94538

with a ps3, yes. other players can output the same with 5.1 or 7.1 analog outs to a receiver with analogs in.

yeah but you told me you wouldn't be happy till the light lights up saying
dts ma, right...

Sith · 04-10-2008, 07:25 PM

Quote:

Originally Posted by CptGreedle

No... the PS3 can not bitstream DTS-HD MA or TrueHD to a receiver. Your receiver does not have to be able to handle them either. The PS3 will decode it.

right, it just needs an hdmi in right....

DutchBoy · 04-10-2008, 07:25 PM

Quote:

Originally Posted by Sith

yeah but don't you need a receiver with hdmi in, i thought that uncompresed
audio couldn't be transmitted thru a optical cable?

That's correct - you can't do the advanced codecs via optical. You have to have an HDMI connection.

un4gvn94538 · 04-10-2008, 07:26 PM

Quote:

Originally Posted by Sith

yeah but you told me you wouldn't be happy till the light lights up saying
dts ma, right...

no, i said some people arent happy till they see it. dont recall me saying i wouldnt be happy.

Sith · 04-10-2008, 07:26 PM

Quote:

Originally Posted by DutchBoy

That's correct - you can't do the advanced codecs via optical. You have to have an HDMI connection.

looks like i know what i want for my birthday....

f the iphone

DutchBoy · 04-10-2008, 07:28 PM

Quote:

Originally Posted by Sith

yeah but you told me you wouldn't be happy till the light lights up saying
dts ma, right...

Won't see that with a PS3, I'm afraid. I could care less...give me the sound!

Pelican170 · 04-10-2008, 07:28 PM

Quote:

Originally Posted by CptGreedle

No... the PS3 can not bitstream DTS-HD MA or TrueHD to a receiver. Your receiver does not have to be able to handle them either. The PS3 will decode it.

No, PCM and Uncompressed PCM are different from each other. PCM is a way of sending a signal and Uncompressed PCM is a file format, such as DD True and DTS HDMA. Check it out if you dont believe me. Thats why you can send many different audio formats VIA PCM, doesnt mean its converting the signal to an uncompressed PCM...

CptGreedle · 04-10-2008, 07:28 PM

Now you have really confused me...

I originally said it send the TrueHD/DTS-HD MA to the receiver as a PCM. Than someone says LPCM. Then you say it doesn't. Then I show it does with links... Now you say it does but it doesn't...
I never said the words "uncompressed PCM" or "converts it to uncompressed PCM". But that seems to be the impression you got. Multichannel PCM is what I meant by PCM.

So it internally decodes TrueHD and DTS-HD MA. No doubt about that.
What it does after that is the issue.
I thought it sent it via PCM to the receiver. Is this wrong? and if so link me please.

DutchBoy · 04-10-2008, 07:29 PM

Quote:

Originally Posted by Luis_A51

PCM is uncompressed sound. DTS-MA and TrueHD are encoded versions of PCM.

Therefore the PS3 decodes the PCM signal from DTS-MA/TrueHD and sends it to the receiver as PCM. The receiver then plays that PCM signal.

Here we go again.

supersix4 · 04-10-2008, 07:30 PM

well the point of this is that now instead of having just a standard 5.1 dts 1.5mbps track it will now be on par with PCM

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04-10-2008, 07:21 PM	#41
Luis_A51 Blu-ray Guru Member since:Jun 2007 Location:Calgary, AB Blu-ray reviews:4	PCM should sound the same as DTS-MA. It has ABSOLUTELY NOTHING to do with the speakers/receiver you have (assuming the player does the decoding). The only time they will sound different is if the audio engineer mixes the DTS-MA in a weird way. But technically speaking, they should be identical. Remember, PCM is THE reference audio track. There is nothing better than pure PCM.

04-10-2008, 07:23 PM	#44
Sith Blu-ray Samurai Member since:Dec 2007 Location:Seal Beach, CA Blu-ray collection:168	yeah but don't you need a receiver with hdmi in, i thought that uncompresed audio couldn't be transmitted thru a optical cable?

04-10-2008, 07:28 PM	#58
CptGreedle Blu-ray Ninja Member since:Jul 2007 Location:Sworn super-hero now services Atlanta (and suburbs). Blu-ray collection:128 Blu-ray reviews:5	Now you have really confused me... I originally said it send the TrueHD/DTS-HD MA to the receiver as a PCM. Than someone says LPCM. Then you say it doesn't. Then I show it does with links... Now you say it does but it doesn't... I never said the words "uncompressed PCM" or "converts it to uncompressed PCM". But that seems to be the impression you got. Multichannel PCM is what I meant by PCM. So it internally decodes TrueHD and DTS-HD MA. No doubt about that. What it does after that is the issue. I thought it sent it via PCM to the receiver. Is this wrong? and if so link me please.

04-10-2008, 07:30 PM	#60
supersix4 Blu-ray Archduke Top contributor Member since:Mar 2007 Blu-ray collection:572 Blu-ray reviews: 53 Trading Score:3	well the point of this is that now instead of having just a standard 5.1 dts 1.5mbps track it will now be on par with PCM

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