wind noise remedy

Discussion in 'Amateur Video Production' started by l e o, Sep 30, 2006.

  1. l e o

    l e o Guest

    My friend gave me some rare interviews he took in foreign country years
    ago. Unfortunately many outdoor footage are ruined by wind noise. What
    can I do to improve the audio?
     
    l e o, Sep 30, 2006
    #1
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  2. l e o

    Netmask Guest


    The simple answer is very little without affecting the sound quality -
    prevention is better than cure, however the following may improve
    intelligibility.

    Use a high pass filter to remove all frequencies below around 120Hz, the
    sharper the better (40db per octave or better) add a modest amount of boost
    around 3kHz to lift the presence of the voices say 3 to 4 db, If the dialog
    is reasonably clear you could roll down the response starting at 250Hz and
    being about 6db down at 120Hz.

    If the voices sound 'tubby' a small narrow band dip set at 700Hz but no more
    than - 4 to 6 db will help. This is the average natural resonance of a
    typical human chest and accounts for the tubbiness of the sound when chest
    microphones are used or badly placed.

    After doing this pass the result through a compressor to reduce the dynamic
    range, you can then raise the average level of the track to make it
    subjectively sound 'louder'. If you have access to a sound processing tool
    called iZotope Ozone 2 then you could play around with the many presets to
    minimise the wind noise effect.
     
    Netmask, Oct 1, 2006
    #2
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  3. If it is worth it, you can take it to a professional sound
    studio where they can use Cedar or some high-end
    commercial noise reduction software.

    Else, you can play around with it yourself, filtering, etc,
    as suggested by others, but don't get your hopes up.

    This is much more difficult/expensive to do than most
    people realize. Multi-million-dollar budget films find
    it cheaper/faster to hire their million-dollar actors to
    come in and dub the dialog in a quiet studio rather than
    try to remove the noise in the recording. It is the same
    today as it was 50 years ago.
     
    Richard Crowley, Oct 1, 2006
    #3
  4. ADR
    --
     
    Martin Heffels, Oct 1, 2006
    #4
  5. l e o

    Netmask Guest

    The ultimate problem occurs when you are using a microphone without a
    windgag and you get a gust of wind that just flattens the diaphragm against
    the stops - [email protected]!!! no filter will resurrect the words affected. I do
    forensic audio from time to time, I wish I had the 'tools' apparently
    available only to Hollywood fiction writers and various CSI TV schlock's...
    but the plugins I mentioned in the previous post will help. You will need a
    program like Wavelab or Adobe Audition or even DV Six Audio Workstation. Be
    consistent with the settings for the entire program so you don't become
    aware of a particular interviewer in a good situation and a bad situation.
    In other words you have to apply the filter for the total duration - in
    psychoacoustic terms the ear doesn't get a reference point to compare good
    with bad.
     
    Netmask, Oct 1, 2006
    #5
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