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Help! Need files fixed, glitch every 96 samples.

Discussion in 'Recording' started by Lem0ns, Aug 12, 2014.

  1. Lem0ns

    Lem0ns Active Member

    Help, please!

    I need help fixing these audio files. They were recorded at 48khz, 24bit through a Focusrite liquid 56 interface. The ASIO buffer was set at 96.

    This has never been an issue before and I was monitoring direct (not through the DAW) so there was no apparent distortion. There are 4, 20-25 minute podcasts. 2 microphones in the same room.

    As you will hear from this example, there is a crackle/distortion throughout, which gets more apparent as the signal gets louder.

    When you inspect the file, there is a single sample out of place every 96 samples. If I select the area (adjacent samples) and use a repair tool in Audacity, or SoundForge etc. I've had good success in "fixing" it. (much better than any decrackle I've tried)

    I can't find a tool that will do just this task. It seems that all "declick/decrackle" plugins "listen" for the crackle and then try to remove it. But if I could tell them that it happens every 96 samples then I'm sure it would work better. If you can find a tool that does this I would greatly appreciate.

    I've considered scripting. I don't have access to soundforge .. just a demo, but I understand you can do some scripting with it. Apparently if you have some programming skills you can do scripting in Audacity. (requires a recompile of the software and then knowledge of python) I created a keyboard macro that would select the bits, apply the repair tool, then move ahead 96 samples, then repeat. It works for a while but the software gets bogged down with too many commands after a while. And it is very slow.

    Re-recording is not an option. The whole project would be scrapped if it can't be repaired. If you can help, please download the attached file and then contatct me. Thanks in advance!

    https://www.dropbox.com/s/bymb0lh7kvu8901/Audio 07.wav
  2. RemyRAD

    RemyRAD Well-Known Member

    You have the Audacity to be using Audacity.

    View: https://soundcloud.com/remyrad/audio-07nr

    So I cleaned this up with some other software quickly. I didn't pass the Audition. That is, I didn't pass on Audition. I passed it through, Audition. I didn't win the Audition. I had to buy it. So it's now noise reduced from the Audition. It was easy. Took mere seconds.

    It's not perfect but it will have to do. I'm perfect.
    Mx. Remy Ann David
  3. Lem0ns

    Lem0ns Active Member

    It is better than my results with iZotope! Thanks. I'll PM you.
  4. RemyRAD

    RemyRAD Well-Known Member

    I went to your homepage and gave you my direct e-mail.
  5. Lem0ns

    Lem0ns Active Member

    Email Sent!
  6. Josh Conley

    Josh Conley Active Member

    i think the looming question is still: why did it happen and how to prevent it?
  7. audiokid

    audiokid Staff

    nice clean up Remy.

    To the OP,
    Sounds like your buffer is set to low. Change it to 128/ 256 or until it stops this.
  8. Lem0ns

    Lem0ns Active Member

    It isn't normally a problem. I can usually record 16+ tracks with some plugins running with the buffer set at 96 and the CPU barely hitting 20%
    I can't replicate the issue. I can even go down to 64 samples without any problems. The only other time this happened I caught it right away and fixed by just restarting the DAW/resetting the interface.
  9. audiokid

    audiokid Staff

    Ya, it definitely sounds like in a conversion/interface issue or a bug that threw it off a nudge. . Restarting it would make scene as it reset your clock.
  10. Lem0ns

    Lem0ns Active Member

    I got thinking about it and decided to give iZotope a try again.

    I ended up duplicating the track and processing the high and low frequencies separately.
    After the recombine it seems to have done a pretty good job.

  11. audiokid

    audiokid Staff

    Good plan. good luck.
    Hey, make your dropbox examples public. Right now you need to download them. When I post my work, MP3 will stream.
  12. Lem0ns

    Lem0ns Active Member

    (Dead Link Removed)

    Hopefully that works.
  13. audiokid

    audiokid Staff


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