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Dolby Digital Or LPCM

Discussion in 'Home Cinema & Hi-Fi' started by TheHitMan-1973, Jan 20, 2019.

  1. TheHitMan-1973

    Wise Guy

    Joined: Feb 2, 2010

    Posts: 1,280

    Location: Haywards Heath

    I have connected up my Sony HT-XT3 up to my Sky HD box and my Sony blu ray player

    Watching Sky T.V on most channels i get Dolby Digital format , but when i play blu ray dvd i get LPCM format

    Is this normal ?
     
  2. PiKe

    Capodecina

    Joined: Oct 18, 2002

    Posts: 24,564

    Location: Lake District

    Yes, Sky is bandwidth limited so you end up with the compressed DD stream.

    LPCM (basically uncompressed) is on Blu-ray because space isn't of a concern.
     
  3. Nick1881

    Sgarrista

    Joined: Feb 4, 2007

    Posts: 9,403

    Location: Nuneaton, UK

    You may find the blu-ray player has an audio option for bitstream.

    LPCM means the player is doing the encoding, when you get DTS-HD etc on your amp then the amp is doing the processing. I like to have bitstream on so I can see what audio I'm actually getting.
     
  4. TheHitMan-1973

    Wise Guy

    Joined: Feb 2, 2010

    Posts: 1,280

    Location: Haywards Heath

    I have changed all settings on blu ray player but still comes up LPCM on amp not Dolby Digital , when watching Sky its saying Dolby Digital

    Looked in menu on blu ray player , i have set Digital Audio Output to " Auto " the other option is PCM
    Other settings i did change was Downmix to " Surround "
     
  5. TheHitMan-1973

    Wise Guy

    Joined: Feb 2, 2010

    Posts: 1,280

    Location: Haywards Heath

    Other option i had was

    DB Audio MIX Settings " On "
     
  6. PiKe

    Capodecina

    Joined: Oct 18, 2002

    Posts: 24,564

    Location: Lake District

    LPCM IS UNCOMPRESSED

    Why do you WANT a compressed audio stream over an uncompressed one?
     
  7. TheHitMan-1973

    Wise Guy

    Joined: Feb 2, 2010

    Posts: 1,280

    Location: Haywards Heath

    Which is better LPCM or DD ?
     
  8. PiKe

    Capodecina

    Joined: Oct 18, 2002

    Posts: 24,564

    Location: Lake District

    Uncompressed :rolleyes:
     
  9. cyclops12

    Wise Guy

    Joined: Aug 23, 2004

    Posts: 1,762

    They're both uncompressed/lossless, as Nick said LPCM is the player doing the decoding and bitstream the amp is decoding.

    I always bitstream from my 4k player as I also like to see what audio I'm getting.

    Thehitman LPCM or bitstream it'll still be DD or DTS you're listening to.
     
    Last edited: Jan 22, 2019
  10. fezster

    Hitman

    Joined: Jan 7, 2007

    Posts: 506

    DD (Dolby Digital) is not lossless. Neither is DTS.

    However, their "HD" equivalents (Dolby TrueHD and DTS-HD) are considered lossless. They are still compressed, but the resulting sound when uncompressed should be indistinguishable to the original.

    LPCM is uncompressed audio.

    Whether the decoding is done on the player or the amp should be inconsequential in terms of what you hear. The only difference is what you see on the front of the amp.
     
  11. james.miller

    Capodecina

    Joined: Aug 17, 2003

    Posts: 18,380

    Location: Woburn Sand Dunes

    i believe you have to bitstream from the player if you want dts:x or dolby atmos, so there's that. On the flip side, if you like secondary audio then LPCM from the player is better otherwise the audio gets down-res'd. So it's not quite as clear cut as use either because they're both the same.
     
  12. TheHitMan-1973

    Wise Guy

    Joined: Feb 2, 2010

    Posts: 1,280

    Location: Haywards Heath

    So thats for people help , now i know its normal to get LPCM