I am trying to remove undesirable sounds from a recording:

I have a video conference recording that includes sounds such as "Has joined the conference" and "has left the conference" that I am trying to get rid of. The difficulty is that these sounds sometimes appear while someone is speaking.

There are part of the recording when these sounds occur and no one is speaking so I could be able to extract these sounds.

Are you aware of any free software able that would be able to match and remove a specific audio track within a larger audio recording?

All I can find online is how to remove "background noise" and "clicking noise" but nothing that would match a specified sound.

Thank you!

  • 1
    I don't even know of any expensive software that could do it. This is a razor-blade task; one at a time, by hand.
    – Tetsujin
    Commented Dec 8, 2016 at 20:10
  • I am also not aware of any solution to this problem, so rather than talking about a solution, I'd like to discuss the problem. Hopefully some programming genius might some day be inspired to take this on and create a solution. An additional problem regarding removing a sound is the volume and harmonics of other sounds in the area to be modified. Simply subtracting out a waveform is not going to work where that waveform is overlapping other waveforms. A spectrum view of how subtraction works: ![Subtracting one waveform from another](i.stack.imgur.c Commented Dec 18, 2016 at 10:53
  • I'm sorry, but this is utter nonsense.
    – Mark
    Commented Dec 18, 2016 at 10:58
  • Which part do you disagree with, how simple subtracting of a waveform works, or the idea of a 2D visual spectrum editor? Commented Dec 18, 2016 at 11:05
  • First and foremost, this is not the place for a discussion on whether this is a potential answer or not. It's either an answer to the problem or it isn't. IMHO your answer uses lots of long words without really addressing the issue in a manner that communicates that you understand either the concepts or the problem.
    – Mark
    Commented Dec 18, 2016 at 11:09

2 Answers 2


This might be possible with a some kind of electrical or mechanical noise etc. but with human voice (even synthesized voice) the frequency range is simply too wide to remove without also removing most of the fidelity of the recording in question.

That being said, Reaper DAW (free to trial) has a built-in plugin 'ReaFIR' which will allow you to capture sort of "audio signature" and then invert the phase during playback to filter it out. Feel free to give it a shot, but I don't expect the results to be very easy-listening.

Some tutorials exist for this, like this one (Full disclosure: I have not reviewd that video for quality).

  • 1
    Thank you for your answer! I have given it a try and you are right; as the noise that I am trying to remove is actually a voice of someone talking the range of frequencies is just too wide and too close to the other frequencies used by the actual speakers. When I subtract these frequencies from my overall recording the voices of the other speakers become really robotic and "weird". Anyway, thanks for introducing me to Reaper! It could definitely become handy when trying to remove other types of sounds!
    – Yannickv
    Commented Dec 13, 2016 at 11:49

It will be a manual process of:

1/ isolating a clean version of the sound you want to remove 2/ lining up the clean version with an instance of the sound you want to remove - sample accurate - in a new track 3/ inverting the phase of the clean version 4/ summing and bouncing the result.

It will be very difficult to get this right, as you are most likely also dealing with compression artifacts. The result won't be high quality, but it's your best bet. There's nothing out there that will do this for you - not that I am aware of anyway.

  • Thank you for your answer! I have just tried that using the software recommended by DoritoStyle. The result does sound really strange and I do not think there is much that can be done other than re-record the talk of the different speakers. Thank you for the quick answer!
    – Yannickv
    Commented Dec 13, 2016 at 11:54

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