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MPEG Audio signal? Confused

Discussion in 'Blu-ray & DVD Players & Recorders' started by tomacwhite, Nov 22, 2003.

  1. tomacwhite

    tomacwhite
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    In the setup to my Sony 730p DVD player, there is an option to switch the MPEG signal from PCM or MPEG.

    I currently have it set on PCM and apparently this is for you are connecting to an audio component without an built-in MPEG decoder.

    Just wondering what this means basically? Surely the DVD player is the MPEG decoder? What else would be an MPEG decoder that you would connect your DVD player to?


    Can anyone help?

    Thanks.
     
  2. Jase

    Jase
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    There is a thing such as MPEG 5.1 but hardly any discs have this format on them (Region 2 Jerry Maguire is one of them). Most amps/receivers don't have a decoder for this format though. Oddly enough my old Panasonic A360 dvd player had Dolby, DTS and MPEG 5.1 decoding on board.

    Just make sure you are outputting a Bitstream signal for Dolby & DTS and not PCM or you won't get proper 5.1 sound.
     
  3. tomacwhite

    tomacwhite
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    Thanks. Well I have set the DOLBY DIGITAL output to DOLBY DIGITAL and not PCM. Is this what you mean?
     
  4. Jase

    Jase
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    Yes. :)
     
  5. Reiner

    Reiner
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    AFAIK it is called MPEG-MC (Multi-Channel) and was specified to support up to 7.1 but Dolby Digital established itself as "the" standard.
    MPEG-MC is not to be confused with the MPEG-2 Video compression of the pictures (frames) on the DVD.
     
  6. vonhosen

    vonhosen
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    MPEG audio is multi-channel digital audio, using lossy compression from original PCM format with sample rate of 48 kHz at 16 or 20 bits. Both MPEG-1 and MPEG-2 formats are supported. The variable bit rate is 32 kbps to 912 kbps, with 384 being the normal average rate. MPEG-1 is limited to 384 kbps. Channel combinations are (front/surround): 1/0, 2/0, 2/1, 2/2, 3/0, 3/1, 3/2, and 5/2. The LFE channel is optional with all combinations. The 7.1 channel format adds left-center and right-center channels, but is rare for home use. MPEG-2 surround channels are in an extension stream matrixed onto the MPEG-1 stereo channels, which makes MPEG-2 audio backwards compatible with MPEG-1 hardware (an MPEG-1 system will only see the two stereo channels.) MPEG Layer 3 (MP3) and MPEG-2 AAC (also known as NBC or unmatrix) are not supported by the DVD-Video standard. MPEG audio is not used much on DVDs, although some inexpensive DVD recording software programs use MPEG audio, even on NTSC discs, which goes against the DVD standard and is not supported by all NTSC players
     

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