Just what is Dolby Digital Plus?
11-16-06 | 12:53 PM
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From: Tennessee
Just what is Dolby Digital Plus?
Perhaps a dumb question, but I couldn’t easily find any detailed info after searching a couple of keywords.
As I understand it, both Dolby Digital TrueHD and DTS-HD are both lossless. So what exactly is Dolby Digital Plus?
As I understand it, both Dolby Digital TrueHD and DTS-HD are both lossless. So what exactly is Dolby Digital Plus?
11-16-06 | 12:59 PM
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DD+ is mandatory in the HD DVD spec and optional for BD. It has a far greater bitstream of 6 mbps, compared to 640 kbps of dvd. I think HD DVD limits it to around 3 mpbs, which is still pretty damn good. The only way to enjoy DD+ is via HDMI or 5.1 analog cables. If you use a digital connection (coaxial/optical), it will re-encode it as DTS at a rate of 1.5 mbps, which is still much higher than a standard dvd.
11-16-06 | 12:59 PM
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From: Dallas, TX
It mainly has to do with compression. This is from the dolby site...
http://www.dolby.com/professional/pr...gies.html#plus
MOD NOTE: Your signature was slightly modified since it took up six lines instead of five (on a 1024x768 screen). Feel free to edit your signature, but keep it at 5 lines or less. Thanks. -namja
http://www.dolby.com/professional/pr...gies.html#plus
MOD NOTE: Your signature was slightly modified since it took up six lines instead of five (on a 1024x768 screen). Feel free to edit your signature, but keep it at 5 lines or less. Thanks. -namja
Last edited by namja; 11-16-06 at 01:35 PM.
11-16-06 | 01:11 PM
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From: Blu-Ray: We Don't Need No Stinkin' Petition
Its simply an updated form of Dolby Digital. It compresses the data better, but it still lossy. HD DVD limits Dolby Digital to 448Kbps, so anything above that, including the 640Kbps Warner tracks, have to be Dolby Digital Plus (if they are Dolby and lossy). For Blu-ray, they allow Dolby Digital up to 640Kbps, and anything above that is Dolby Digital Plus (again, if Dolby and lossy).
11-22-06 | 01:18 PM
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Originally Posted by mmconhea
does that mean I have to buy yet another receiver?
I have DDEX now I think... are these formats backwards compatible?
At the very least, the players will downrez the audio to DTS or DD and output it over optical or coax, just like DVD players do now (optical or coax don't have enough bandwidth to accomodate lossless sound). But, for now, analog out to the receiver is the way to go.
If you DO buy a new reciever, make sure that it has HDMI inputs and you ought to be able to use the digital outputs for improved sound from the High Def disc players.
