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Confusion over Dolby D & Dolby pl2

Discussion in 'AV Receivers & Amplifiers' started by briandzo, Jul 16, 2003.

  1. briandzo

    briandzo
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    The rear of the 'chaplin' DVD states 'dolby surround'
    whereas within the chaplin setup menus you can choose 'English Dolby Digital' Or 'German dolby digital' as audio options

    whichever u choose the amp displays 'Dolby PL2' as being decoded.

    So is there some misleading info here within the dvd where it states its has a digital soundtrack. althought the sleeve says dolby surround (i assume this means analogue).

    i thought dolby pro logic was effectively an analogue soundtrack and not supposed to referred to as digital.
     
  2. roversd1

    roversd1
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    Dolby Digital comes in many flavours- DD 1.0 (mono), DD2.0 (a.k.a Dolby Surround/ stereo), DD 4.0 (Prologic) DD 5.1 and finally DD 7.1

    The soundtrack on your disk is probably the original Dolby Surround mix transferred directly to the disk. So yes its digital, but only two channels with surround information included for analog processing modes such as PL and PLII.

    Dolby Surround is the comercial 'surround sound' for cinemas whereas Pro Logic is the domestic process introduced for the home many moons ago.
     
  3. Jase

    Jase
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    Dolby Digital comes in various flavours, 5.1, 5.0, 2.0, Mono etc. So I assume that disc only has a Dolby 2.0 soundtrack. Unfortunately it's not always clearly marked on the packaging and sometimes it's labelled incorrectly. :(

    Dolby Surround can be either analogue (VHS) or digital (DVD, Digital Satellite) and decoded by either a Pro Logic or PLII decoder.
     
  4. gmt steve

    gmt steve
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    You are falling into the trap of thinking that all Dolby Digital soundtracks are 5.1.
    DD is a codec, that is a compression format, and can contain anything from a mono to a 5.1 soundtrack. So if a DVD contains a Dolby Surround soundtrack then it is correctly decoded using Dolby Pro-Logic, or Dolby Pro-Logic II. If your 'amp has a small display (usually with little squares for the channels) showing how many channels are present, then that is the easiest way to see exactly how many channels are present.:lesson:
     
  5. gmt steve

    gmt steve
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    Aahgg, you posted first and made me look silly:blush:
     
  6. Reiner

    Reiner
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    Dolby Surround and Dolby Pro-Logic can indeed be carried inside an (analog) stereo track. But the stereo track (including that DS/DPL signal) can also be carried in a Dolby Digital (2.0) stream, whereas the decoder will extract it from there.
    Before digital AV amps/receivers came out DS/DPL decoding was done in the analog domain, today DS/DPL decoding is done digitally.
     
  7. gmt steve

    gmt steve
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    Dolby Pro-Logic is a matrix decoding system, it isn't carried by any medium. It is used to decode Dolby Surround.:lesson:
     
  8. Reiner

    Reiner
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    Yes, gmt steve is correct. My bad. :blush:
     

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