Bad humming in audio problem

Discussion in 'Microphones (live or studio)' started by dojugoo, May 2, 2005.

  1. dojugoo

    dojugoo Guest

    I know someone who has some audio, that can't be redone, and there's bad humming throughout it. I dunno what he used to record it, but is there some things he can do to fix this? Thanks

    And also, is there ways to fix this if he already tried running filters through it?
  2. poprocks

    poprocks Guest

    Try this on the off chance it will work ... take a section of audio where there is as close to silence as possible (i.e. just the hum). Put the copied section of hum on a different channel. Now reverse the phase of the copied section. If the hum disappears, cut and paste that section together to span the whole song.

    I heard this work on a very short 'pop' in a recording that needed to be fixed ... don't know if it'll work for something as pervasive as a constant hum.

  3. axel

    axel Guest

    depending on how strong it is, bias soundsoap has done several times a good job in my case, if applied subtle... at least to reduce a good amount, but the phase reverse trick helps sometimes as well, really depending on the individuell track... and if you can seperate first a 'hum only section'
  4. o2x

    o2x Active Member

    Mar 17, 2005
    If you can afford it, get it restored.

    The problem with phase reversal is that it can cut out bits of the track that you actually want. Pro restoration tools use complex algorithms to remove unwanted artefacts while trying not to alter the wanted stuff.

    I've used CEDAR several times to remove crap from archive film material. You will be astonished by the results. Pyramix also make a very good system, but these are harder to find than CEDAR equipped studios.
  5. poprocks

    poprocks Guest

    Absolutely true. But, the pro restoration tools are also spendy, no? Phase reverse may be a "poor man's" trick!


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