Mini DV Sound Glitches

Discussion in 'Amateur Video Production' started by Gary Eickmeier, May 13, 2005.

  1. This may be a simple question. Hope so.

    I have been using my Sony VX2000 for a couple of years now with no
    problems. Lately, I have been getting sound dropouts, just for a split
    second, randomly. Video carries on fine. I'm wondering how the sound
    could drop out separate from the video, since it is all recorded by the
    helical scan heads in the same pass, and is digital. Is there something
    about the scan sequence or format that could make the sound more
    delicate than the video, in case of clogged or dirty heads?

    I have, of course, cleaned the heads. I have been cleaning them as best
    I could with wet swabs, but it is really hard to get a good motion
    around the whole head. I just kind of nudge the head around with the
    swab itself, hoping there will be enough action against the heads and
    enough chemical to clean them.

    But this time I used a regular cassette head cleaner, and it seems to be
    better. Do you use the abrasive cleaner tapes, chemical, or what? Anyone
    else ever experience sound drop outs?

    GAry Eickmeier
    Gary Eickmeier, May 13, 2005
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  2. Gary Eickmeier

    Harry Kiri Guest

    Does this happen when listening to audio straight out of the camera?
    If so, ignore the rest of the post.

    What does the timeline look like? Are you losing just a single frames'
    worth of audio?

    If so, it might be an old problem (usually only experienced on Canon
    cameras), of the audio sample rate running slightly off a true 48KHz.
    Sony's were immune to the problem because their cameras were an order
    of magnitude more accurate in sample rate than Canon. The XL1 was
    notoriously bad for running off their correct sample rate. Doesn't
    seem likely with a VX, but I guess the crystal might have drifted off
    a bit by now. The video frame rate and the audio sample rate aren't
    locked on a VX.

    The problem first surfaced on Canon cameras back around 1998 - 1999,
    lots of posts on XL1 audio "glitches" at the time, you could search on
    XL1 and glitches for more info.

    Harry Kiri, May 13, 2005
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  3. No. Several frames.
    Thanks. I guess that's not my problem.

    GAry Eickmeier
    Gary Eickmeier, May 14, 2005
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