Jump to content



Sign up for a free account to remove the pop-up ads

Signing up for an account is fast and free. As a member you can join in the conversation, enter contests and remove the pop-up ads that guests get. Click here to create your free account.

Photo
- - - - -

TrueHD BD Discs with 96khz Sampling Rate?


This topic has been archived. This means that you cannot reply to this topic.
7 replies to this topic

#1 of 8 OFFLINE   Mark_TB

Mark_TB

    Second Unit



  • 340 posts
  • Join Date: Jun 06 2005
  • LocationOmaha, Nebraska

Posted August 30 2008 - 04:37 PM

Okay, I hope I don't sound like an idiot here, but I've spent most of the evening trying unsuccessfully to google an answer, so I hope someone here can help me out.

This week I finally picked up a receiver with HDMI inputs (Yamaha RX-V663) so I could fully enjoy the sound from my BD and HD-DVD players (Panasonic BD-30 and Toshiba HD-A2).

On the discs I've checked, the HD-DVD player outputs TrueHD as PCM at a sampling rate of 96khz. However, I've only found one BD in my collection with a 96khz sampling rate, and that was using DTS-HD -- everything else is 48khz, both TrueHD and DTS-HD.

Why is this? Is it simply because most BDs use a 48khz sampling rate? Does it really make any noticeable difference, or should I just relax and enjoy?

Thanks in advance for any responses!

Mark

EDIT: Is there a website that lists the sampling rates of HD discs?

#2 of 8 OFFLINE   Craig_Ehr

Craig_Ehr

    Second Unit



  • 327 posts
  • Join Date: Jul 15 2002

Posted August 31 2008 - 03:48 AM

Quote:
Originally Posted by Mark_TB
Okay, I hope I don't sound like an idiot here, but I've spent most of the evening trying unsuccessfully to google an answer, so I hope someone here can help me out.

This week I finally picked up a receiver with HDMI inputs (Yamaha RX-V663) so I could fully enjoy the sound from my BD and HD-DVD players (Panasonic BD-30 and Toshiba HD-A2).

On the discs I've checked, the HD-DVD player outputs TrueHD as PCM at a sampling rate of 96khz. However, I've only found one BD in my collection with a 96khz sampling rate, and that was using DTS-HD -- everything else is 48khz, both TrueHD and DTS-HD.

Why is this? Is it simply because most BDs use a 48khz sampling rate? Does it really make any noticeable difference, or should I just relax and enjoy?

Thanks in advance for any responses!

Mark

EDIT: Is there a website that lists the sampling rates of HD discs?

I would be careful in assuming TrueHD sampling rates on HD DVDs are encoded at a sampling rate of 96kHz. My PS3 can output good old red book CDs at 176.4 kHz (via upsampling.) I'm not familiar with Toshiba products personally, but it is possible your HD DVD is doing something similar. My understanding is the vast majority of movie soundtracks are recorded at 48kHz, and usually at only 16-bit resolution but that is changing more and more to 24-bit. I believe there are a few music-related discs encoded at 96kHz (or better), e.g. 'Dave Matthews and Tim Reynolds: Live at Radio City'.

Here's hoping that DSD is made an optional codec for BD Profile 3 (but I'm not holding my breath.) Posted Image

#3 of 8 OFFLINE   Robert George

Robert George

    Screenwriter



  • 1,014 posts
  • Join Date: Jul 03 1997

Posted August 31 2008 - 03:59 AM

The new John Mayer BD has a 96/24 TrueHD track. There are no movie titles I am aware of with anything above 48kHz sampling rate audio.

#4 of 8 OFFLINE   Mark_TB

Mark_TB

    Second Unit



  • 340 posts
  • Join Date: Jun 06 2005
  • LocationOmaha, Nebraska

Posted August 31 2008 - 04:46 AM

Okay, let me make sure I understand this. Most HD soundtracks are 48khz, and my Toshiba HD_DVD player is just "upconverting" to 96khz.

My Queen - Rock Montreal BD states right on the packaging that it has a DTS-HD 96khz track and is the only disc I own that even mentions 96khz, so I assume that this is the exception rather than the norm (as are the Dave Matthews & Tim Reynolds and John Mayer discs).

Does that sound about right?

Also, I just want to thank everyone here at the HTF, because you all have been very helpful to this HD newbie. I'd really be lost without you guys.

Mark

#5 of 8 OFFLINE   Robert George

Robert George

    Screenwriter



  • 1,014 posts
  • Join Date: Jul 03 1997

Posted August 31 2008 - 06:49 AM

Quote:
Does that sound about right?

Pretty much. About the only discs you will find with anything above 48 kHz sampling frequency (actual) will be the odd music program. Upsampling in a player is not that uncommon, but should not be mistaken for the real thing.

#6 of 8 OFFLINE   Wayne_j

Wayne_j

    Supporting Actor



  • 646 posts
  • Join Date: Nov 07 2006
  • Real Name:Wayne

Posted August 31 2008 - 09:36 AM

The Celine Dion Vegas BD has a 24bit/96K stereo PCM track and a 5.1 24bit/96K DTHD track.

#7 of 8 OFFLINE   Douglas Monce

Douglas Monce

    Producer



  • 5,514 posts
  • Join Date: Nov 16 2006

Posted August 31 2008 - 02:10 PM

The fact of the matter is the vast majority of sound effects libraries that are still used on most movies today are delivered on music CDs. Meaning that they are recorded at 44khz 16bit. Most location sound is also recorded at this rate, although some are going up to 24bit, its not universal yet.

While a film may have been mixed at 96khz 24bit (which is a good idea for error correction), the original sounds being used in that film are likely no where near that resolution. So having the ability to play back at that resolution probably won't give you any advantages with the majority of material out there.

Of course there is a move to upgrade everything to 96/24 and many films that used custom sounds probably are recording at that level, but no film uses 100% custom recordings.

The point being the sound you hear in a movie is a mixed bag at best. In fact many movies are still using sound effects that were recorded for Dracula in 1932. The famous thunderclap called "castle thunder" can be heard in films from Star Wars to Back to the Future, to Transformers.

Doug
"I'm in great shape, for the shape I'm in."
Bob Hope in The Ghostbreakers

#8 of 8 OFFLINE   Ed St. Clair

Ed St. Clair

    Producer



  • 3,320 posts
  • Join Date: May 07 2001

Posted August 31 2008 - 05:31 PM

Quote:
Originally Posted by Wayne_j
BD has a 24bit/96K stereo PCM track
That answers my question.
Would be GREAT if this turned into a list of high bit/sampling rate titles.
Thanks again.
Movies are: "The Greatest Artform".
HD should be for EVERYONE!





Forum Nav Content I Follow