Dolby 3/2.1?

Discussion in 'Archived Threads 2001-2004' started by Sacha_C, Jan 21, 2003.

  1. Sacha_C

    Sacha_C Second Unit

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    Why does my receiver say "Dolby 3/2.1" when a 5.1 signal is sent? Is it for 3 front 2 rear 1 sub? Why doesn't it say 5.1?

    Thanks
     
  2. DarrylM

    DarrylM Stunt Coordinator

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    That's pretty much it; 3 channels in the front and 2 in the rear. The Dolby scheme in most receivers allows for other configurations of the 5.1 soundtrack, like a "phantom center" mode if you do not have a center channel speaker. I believe this would probably display something like "2/2," instead of "3/2."
     
  3. Steve Schaffer

    Steve Schaffer Producer

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    This is pretty much standard practice for receiver displays. Dolby Digital can in fact be anything from Mono to 2.0 to 5.0 to 5.1. The display typically is a representation of what channels are actually encoded on the particular disc, so you're not always going to see 3/2/1 even when playing a Dolby Digital soundtrack.

    I'm sure your receiver came with an owner's manual, which may be able to answer many of your questions.
     
  4. Wes

    Wes Screenwriter

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    Which brand of receiver is it? I think Sony likes to word DD like that, most receivers show 3/2.1 as 5.1!

    Wes
     
  5. GregK

    GregK Screenwriter

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    Hmmm.. I can think of one situation where Dolby's channel ID system can a little more descriptive than the 5.1, 4.1, 2.0, etc..

    A typical four channel mag film from the 1950's could be presented in DD 4.0 or 4.1 (Dolby's ID system would call this 3/1.0 or 3/1.1).. Note however a typical 4-channel quadraphonic mix from the 1970's could also be DD 4.0, but it's a different channel layout than film's 4-channel channel assignments. Dolby's ID system would show quad's layout a little better: 2/2.0 ..which indicates stereo fronts, stereo rears, but no center or LFE track.

    In the end though, it's still all good. [​IMG]
     
  6. Brian_Tho

    Brian_Tho Stunt Coordinator

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    The reason your receiver says that is because that is the way all sonys work know. My friend and I just conversed and he says his does the same thing. You are correct in assuming that 3/2.1 is 5.1 just another way of naming it. Hope this helps.
     
  7. SvenS

    SvenS Second Unit

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    You also will get 3/2+1 if it is DD-EX (is your receiver decodes DD-EX), and 3/3 if it's DTS-ES Discrete.
     
  8. Wes

    Wes Screenwriter

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  9. SvenS

    SvenS Second Unit

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  10. BruceLongee

    BruceLongee Agent

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    My Sony (STR-DE985) shows DD 5.1 EX as "DOLBY DIGITAL[3/2.1]" (same as regular DD 5.1), and DTS ES as "dts[3/3.1]" (as opposed to "dts[3/2.1]" for regular DTS 5.1.
     
  11. John_F

    John_F Stunt Coordinator

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    Isn't the "phantom center" more of a setup issue, which is different from the signal sent? I would think the display would be "3/2.1" even if you had a "phantom center".

    Regards,
    John Flegert
     
  12. DaveVan

    DaveVan Extra

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    There is a "Dolby Digital 3" mode, that uses front speakers to generate a virtual rear surround effect. Could that be it?
    Saw this on the list of modes for the RCA RT2500.
     
  13. Brian_Tho

    Brian_Tho Stunt Coordinator

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    The reason your receiver says that is because that is the way all sonys work know. My friend and I just conversed and he says his does the same thing. You are correct in assuming that 3/2.1 is 5.1 just another way of naming it. Hope this helps.

    The reason your receiver says that is because that is the way all sonys work know. My friend and I just conversed and he says his does the same thing. You are correct in assuming that 3/2.1 is 5.1 just another way of naming it. Hope this helps.

    The reason your receiver says that is because that is the way all sonys work know. My friend and I just conversed and he says his does the same thing. You are correct in assuming that 3/2.1 is 5.1 just another way of naming it. Hope this helps.
     
  14. Sacha_C

    Sacha_C Second Unit

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    "My Sony (STR-DE985) shows DD 5.1 EX as "DOLBY DIGITAL[3/2.1]" (same as regular DD 5.1), and DTS ES as "dts[3/3.1]" (as opposed to "dts[3/2.1]" for regular DTS 5.1."

    Are you saying the DE985 supports DTS ES? Or does it just recognize it on the display.
     
  15. BruceLongee

    BruceLongee Agent

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    I believe the 985 recognizes DTS ES as such, and then decodes it via matrix decoding. I don't know for sure because I don't have a back surround speaker set up yet...
     

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