Dolby Digital Plus question

Discussion in 'Playback Devices' started by DavidDTS, Jun 13, 2006.

  1. DavidDTS

    DavidDTS Agent

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    Here is a simple question for the HD folks out there:
    Does my receiver have to HDMI inputs in order to get the DD+ or can this also come through with Optical Digital cable (from player to receiver) ?
     
  2. Mark Zimmer

    Mark Zimmer Producer

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    On the HD-A1, you have to have either HDMI, or 5.1 analog outputs to get DD+. Optical and Coax give you encoded DTS.
     
  3. Rob_HD

    Rob_HD Stunt Coordinator

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    You can get this sound via Analog inputs on your AV/R or HDMI. As Mark says, you can also get them via optical and coax, but these two connectors cannot transport the higher bandwidth that DD+ offers, so for optical and coax, the players convert the decoded DD+ audio into a 1.5 megabit DTS stream.
     
  4. DavidDTS

    DavidDTS Agent

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    Thank you both for the reply. So am I to assume you both prefer DD+ over the DTS encoding?
     
  5. Neil Joseph

    Neil Joseph Lead Actor

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    Then there is DD True HD and I have only seen 1 or maybe two HD-DVD's with that audio encoded, Pahntom Of The Opera being one of them.
     
  6. Rob_HD

    Rob_HD Stunt Coordinator

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    Getting the decoded DD+ as PCM is the ideal, as it will not be altered by recoding to DTS. So if you have an AVR with HDMI inputs, then this is the best solution. Any version of HDMI will do, you don't need HDMI 1.3 to pass this decoded DD+ PCM 5.1 (or even 7.1) audio.

    But if you have to use optical, the DD+ recoded to 1.5 megabit DTS is still better than a regular DD soundtrack, so it's not a big problem. It's good to have the legacy support.
     
  7. Doug Schiller

    Doug Schiller Supporting Actor

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    Well, Perfect Storm says it has a Dolby HD 5.1 track.

    Does the Toshiba player decode the signal?
    So, if I have analog inputs, am I getting the true signal?
     
  8. Dan Hitchman

    Dan Hitchman Cinematographer

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    Only the left and right stereo channels of the Dolby TrueHD track can be decoded by the Toshiba.

    Dumb!!

    The Blu-Ray titles are the same resolution as the HD-DVD titles: 16 bit/48 kHz (basically downconverted CD quality, not high resolution from the archival masters) and are placed as uncompressed Linear PCM 5.1 tracks so far... so in layman's terms the same quality as the current Dolby TrueHD 5.1 lossless compressed tracks on HD-DVD.

    Dan
     
  9. Reagan

    Reagan Supporting Actor

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    I agree. This is one of the strangest things about the Toshiba. I can't understand why it was done. Why not 5.1 channel analog? Anyone know?

    -Reagan
     
  10. Doug Schiller

    Doug Schiller Supporting Actor

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    I would guess the PC they have inside the Toshiba can't handle it. They probably would have had to put in a dedicated sound/codec card.
    It still doesn't make sense. I guess it is like the first generation of SD DVD players that couldn't play DTS.
    Remember that?
     
  11. Cees Alons

    Cees Alons Moderator
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    Yes, but there was a different reason for that: DTS came too late with the official proposal and wasn't included in the first operative specs of the format. After a year, or so, it was agreed upon.


    Cees
     
  12. Dave H

    Dave H Producer

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    Aren't most movie masters at 16/48?
     
  13. Paul Anthony

    Paul Anthony Stunt Coordinator

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    Why is Toshiba advertising in their current HD-DVDs for 7.1 lossless sound if it's not available? Will a firmware upgrade do the trick? [​IMG]
     
  14. Rob_HD

    Rob_HD Stunt Coordinator

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    Uhhhh.... The HD DVD players DO IN FACT use hardware decoders for this, not the Intel CPU. There are four Analog Devices SHARC chips which handle this and two of them are flash-upgradable.

    Word going around is that within 3 weeks there will be a firmware update which MAY support 5.1 TruHD decoding...
     
  15. Rob_HD

    Rob_HD Stunt Coordinator

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    It can handle L-PCM lossless audio as well...
     
  16. Rob_HD

    Rob_HD Stunt Coordinator

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    My guess is the code for the decoder chips wasn't ready in time.

    There is a firmware update coming in the next three weeks which MAY add 5.1 TRU HD decoding...
     
  17. Lew Crippen

    Lew Crippen Executive Producer

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    Not a challenge Rob, but your source for this would be? …
     
  18. Dan Hitchman

    Dan Hitchman Cinematographer

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    From what I've read from a sound mixer at Todd-AO most newer soundtracks are mixed at 24 bit/48 kHz and Warner Brothers is adding support for 24/96 soon.

    From comments by Stacy Spears on AVS Forum it looks like they're downgrading to 16/48 in order to squeeze the bitrates. A 24/48 or 24/96 lossless compressed track can still require peaks of 6-8 Megabits/sec. This is based off of DVD-Audio lossless tracks, which use Meridian Lossless Packing (MLP). MLP is the backbone of Dolby TrueHD lossless with more channels and higher resolution than DVD-Audio music discs as a possibility.

    Dan
     
  19. Rob_HD

    Rob_HD Stunt Coordinator

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  20. JohnS

    JohnS Producer

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    So, I would need one of these cables to hook up to my HD DVD player and my Denon reciever, to get DD+

    Cable
     

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