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Thread: Tape conversion / Spectral noise removal

  1. #1

    Question Tape conversion / Spectral noise removal

    Hi everybody.


    I'm converting an audio tape using iZotope RX 4 Advanced for noise removal.


    I'm achieving a good result, with good fidelity, but I'm still fighting a problem you can see in this spectral screenshot and .wav fileAttachment 2040:



    Clicks.zip


    It sounds like periodic clicks, but declick filters fail in repairing.
    It's very easy to manually repair any clicks using RX's Spectral Repair module where the track is silent (attachment), but it's impossible to fix where it plays loud.
    I've been attempting to repair with other similar software, no way.


    Can anybody suggest any software to "learn" these clicks and cut them from the whole track?


    Thanks everybody.


    Regards

  2. #2
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    From the signal processing viewpoint, you need to convert from the time domain to the spectral domain, remove the offending frequencies and convert the result back to the time domain

    you may accidentally carve out some of the information but that is understood

    If stereo, is it in one channel or both?

  3. #3
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    i don't think you'll be able to "learn" this. How many of them do you have?

    If the declick is not effective enough I think I would try to use a sample of the click against a silent background and "learn" that using denoise.
    Then apply denoise to only the parts of the track that have the click.
    This assumes you can take a sample of noise that is long enough.
    Tim

  4. #4
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    If it is in stereo, try subtracting one channel from the other like they do in karaoke to remove the vocals - if the click is of equal volume in both channels, it will be gone - you will need to bring the levels back up after subtraction

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