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Participant
January 26, 2009
Question

Can Audition fix distortion?

  • January 26, 2009
  • 13 replies
  • 33076 views
It seems most of my footage, which we recorded on Sony HDCAM tapes, is poor. There is distortion in a lot of the dialog, which sounds very tinny or has annoying echoes. (There's also a lot of static and background noise, but I know Audition can fix that.) I've been told that there's no way to fix distortion if the audio has been recorded poorly to begin with. Just thought I'd ask the experts here if you agree or there actually is a way to fix it. (If not with Audition, any other possibilities?)
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    13 replies

    Participant
    January 26, 2009
    Thanks for the input, guys. What are the tools or techniques for repairing at least some of the distortion?
    SteveG_AudioMasters_
    Community Expert
    Community Expert
    January 26, 2009
    >'Distortion' is actually missing data, and you can't bring forward something that simply isn't there.

    Well that's true, but not by any means the only definition. Distortion can also be caused by too much data, and not all of it is removable by any means. Basically, it's mixed in with what's wanted - and like cakes, you can't exactly 'unbake' them after the event.

    The real issue is that in a system that by absolute necessity has to be automated (far too much variable data to be analysed by hand), the automated system has no real means of identifying what's wanted and what isn't - with a few relatively minor exceptions. In order to remove a component in this scenario, it has to be capable of isolation in an electrical sense - so for instance, with a stereo signal, it's not impossible to establish what portion of it is at any given position in the stereo field, and remove just what's at that position. Which means that something like a vocal, which is generally in a single fixed place, can be operated on with a reasonable degree of success (although anything else in that position will also be affected). But the same principle, when applied to something like reverb, simply won't work - because reverb is invariably decorrelated, and occurs all over the soundfield. And because it can't be isolated, it can't be either treated or removed.

    There are various things that may in the future be possible, but they are going to require massive amounts of processing, because at the very least multiple tracking FFT systems will be required.
    January 26, 2009
    You can make the sound slightly less unpleasant to listen to with some EQ and even noise reduction I guess. Static and background noise can in some cases be removed pretty well especially if it is continuous; i.e. a soft fan noise is possible, but varying static and random noises is in practice very difficult or impossible. It's a budget / time thing too; Audition have some amazing surgical tools for you if you have the time, skill and persistence, but even they can only do that much. 'Distortion' is actually missing data, and you can't bring forward something that simply isn't there.