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
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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

    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
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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
  4. ADR
    Martin Heffels, Oct 1, 2006
  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
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