Problem with DPL II: High Freq's and Dialogue in Surrounds

Discussion in 'Archived Threads 2001-2004' started by Jim Howard, Sep 12, 2001.

  1. Jim Howard

    Jim Howard Auditioning

    Nov 22, 1999
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    To the Forum:
    Lately I've noticed an anoying problem while watching TV in ProLogic II. I get these anoying "robot-like" sounds, that seem to corelate with the dialog, in my surrounds. Very muffled, very coarse.
    Has anyone noticed anything similar with DPL II or other new matrix sound modes? Might I simply have some line noise or other interference? Might it just be dirty cable? I'm not sure if I notice it when listening to DD 2.0 material in DPL 2.
  2. Michael Reuben

    Michael Reuben Studio Mogul

    Feb 12, 1998
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  3. Michael Reuben

    Michael Reuben Studio Mogul

    Feb 12, 1998
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    Deleted (forum glitch).
    [Edited last by Michael Reuben on September 12, 2001 at 10:29 PM]
  4. GregK

    GregK Screenwriter

    Nov 22, 2000
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    Jim is it possible that some of material you're
    listening to is 'stereo enhanced' by the TV station
    broadcasting the program? Some years back at the
    previous TV station I worked for (when we had upgraded
    to stereo) the company, like so many others, thought
    that ALL of our programming should be 'in stereo', so
    a stereo synthesizer was added to the audio chain. Of
    course the Engineers were APPALLED by the nasty device
    which made everything sound like it came out of a tin
    can, and added quite a bit of distortion to boot. To
    make matters worse, when this fake 'tin-can' stereo
    was DPL decoded, it squirted out of all five speakers,
    due the various phase shifts. I am VERY happy to report
    these nasty synthesizers are on the decline nationwide,
    but a few misinformed suits and/or Chief Engineers still
    have some in place.
    Stereo synthesizers aside, a low budget station may be
    using an older VTR with minor head mis-alignments which
    would cause high frequency phase shifting. (Or if a cable
    company is real sloppy with the audio - and it happens)
    These types of situations could cause dialog bleed-over
    into the surrounds. If these dialog bleed-over conditions
    are persistent, I would recommend using the standard Pro-
    logic (aka: Retro) mode with HF limited surrounds for
    broadcast television and use the superior DPL-II Movie
    mode with full range stereo surrounds for higher quality
    2-channel material, like VHS hi-fi, 2-ch DVDs etc..

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