Dolby is fixing DPLII bugs?

Discussion in 'Archived Threads 2001-2004' started by Razvan V, Nov 18, 2001.

  1. Razvan V

    Razvan V Stunt Coordinator

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    Here is what I read on a B&K forum:
    "It seems that DTS is still modifying the ES format, which may account for why so few DVDs with the format are available. As for DPLII, apparently there is a problem with how the format handles satellite broadcasts. A solution is in the works, and may in fact already be available. But the Denon 4802 and other receivers of that generation don't include it. B&K is looking at incorporating these latest solutions."
    Has anyone experienced problems with satellite broadcasts when using DPLII?
    Razvan
     
  2. Chuck Kent

    Chuck Kent Supporting Actor

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    The DPL II situation doesn't make a lot of sense. Satellite broadcasts are either PCM or Dolby Digital. Just like what we get from our DVD players.
    I don't understand what the difference is? Why would one be ok and not the other?
    Roger Dressler from Dolby stops by here every once in a while. Maybe he can shed some light on this?
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  3. Chuck Kent

    Chuck Kent Supporting Actor

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    Here is the response I recieved from Dolby on the DPL II "bug" rumour...

     
  4. Wayne Bundrick

    Wayne Bundrick Cinematographer

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    Satellite broadcasts (on DirecTV and Dish Network) are not PCM. They're using digital video compression to squeeze the video data down to 3-5 megabits per second, there's no way they would not compress the audio too. (Stereo PCM is about 1.5 megabits per second.) DirecTV uses MPEG-1 Layer II to compress the audio, and the satellite receiver decodes it to PCM for the digital output. So although there is PCM coming out of the box, that's only the end result for the benefit of your A/V receiver's digital input (becuase A/V receivers don't know how to decode MPEG audio), the audio was not pure PCM from start to finish.

    But Joseph Hull's response makes perfect sense. A ProLogic II decoder doesn't know where the audio came from.
     

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