PCM AND Bitstream, what is the difference?

Discussion in 'Playback Devices' started by Jeff Adams, Jun 4, 2003.

  1. Jeff Adams

    Jeff Adams Screenwriter

    Joined:
    Dec 13, 1999
    Messages:
    1,549
    Likes Received:
    0
    Trophy Points:
    0
    This might sound like a stupid question but now that I got a new dvd player and now here a different sound on dvd movies brought me to this question. My old player was a JVC XV-723GD unit. In the setup menu for it, it gave me the option for DD and DTS bitstream or just PCM for DD and DTS. Well I set it to the bitstream and got no audio,then I set it to PCM and got the audio for DTS and DD. Did I set it up properly? I just bought a Denon 1600 and selected Bitstream for both DTS and DD. The sound out of the Denon sounds a lot better now. More open and very detailed, however I have noticed that I have lost some of the low frequency impact that I had with my JVC. What could cause this?
     
  2. jeff lam

    jeff lam Screenwriter

    Joined:
    Jun 4, 2001
    Messages:
    1,798
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    San Jose, CA
    Real Name:
    Jeff Lam
    If you have a receiver with DD and DTS decoders use bitstream. PCM downconverts the 5.1 into 2.0 basically. So if you are using just your TV for sound or just a 2-ch amp then use PCM.
     
  3. Jeff Adams

    Jeff Adams Screenwriter

    Joined:
    Dec 13, 1999
    Messages:
    1,549
    Likes Received:
    0
    Trophy Points:
    0
    I was just told by someone that the difference is if you are using a coax digital connection then you have to set it to PCM and if you are using the toslink then you have to set it to bitstream. I don't know how accurate that is.
     
  4. jeff lam

    jeff lam Screenwriter

    Joined:
    Jun 4, 2001
    Messages:
    1,798
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    San Jose, CA
    Real Name:
    Jeff Lam
    Nope, both are digital connections and allow your receiver to do the decoding if you have a receiver that decodes DD/DTS signals. PCM is for systems that have only 2 speakers.
     
  5. Jeff Adams

    Jeff Adams Screenwriter

    Joined:
    Dec 13, 1999
    Messages:
    1,549
    Likes Received:
    0
    Trophy Points:
    0
    That why I put in the comment, "I don't know how accurate that is" I knew he did not know what he was talking about. I still don't understand why I could not get any audio when set up in bitstream on my old dvd player.
     
  6. Dan Driscoll

    Dan Driscoll Supporting Actor

    Joined:
    Aug 1, 2000
    Messages:
    937
    Likes Received:
    2
    Trophy Points:
    0
     
  7. Jeff Adams

    Jeff Adams Screenwriter

    Joined:
    Dec 13, 1999
    Messages:
    1,549
    Likes Received:
    0
    Trophy Points:
    0
    Coax
     
  8. Dan Driscoll

    Dan Driscoll Supporting Actor

    Joined:
    Aug 1, 2000
    Messages:
    937
    Likes Received:
    2
    Trophy Points:
    0
    Then it should have worked, assuming you had your receiver configured to accept the digital coax input? The only other things that come to mind are a damaged cable, damaged connector of malfunction.
     
  9. Ken Chan

    Ken Chan Producer

    Joined:
    Apr 11, 1999
    Messages:
    3,301
    Likes Received:
    0
    Trophy Points:
    0
     
  10. Jeff Adams

    Jeff Adams Screenwriter

    Joined:
    Dec 13, 1999
    Messages:
    1,549
    Likes Received:
    0
    Trophy Points:
    0
    Ken,
    Yes, now that I get true 5.1 it does say that on my receiver. It did not show up like that before. I now hear a world of difference. I went through and reset everything on my receiver,now everything sounds great.
     

Share This Page