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This is probably an extremely easy question for you, but I'm very new to this. I found a video file of my niece talking and screaming on my phone, but I'm trying to hear the voice in the background. Both voices are talking at almost the same time. The video file is about 40sec long. I was playing around with AVS Audio Editor but couldn't figure out how to lower the baby's voice, if it's even possible. It's the high frequency that I need to lower, the other is a low frequency, thinking that it can be done? Like I said, I'm new to this, so I got very confused with the terminology on other sites and forums. I'm hoping you guys can help me out or point me in the right direction at least.

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2 Answers

Normally mixing is done with a single voice on each channel because it is impossible to completely separate one audio signal from another after they are combined. Sound is additive and there isn't a way to identify one from the other to pull apart cleanly.

That said, what you can do is enhance parts of the sound that will make one voice more clear than the other. When we talk, the frequencies we use to distinguish words vary from person to person. If you use an EQ to reduce the frequency of the child's voice and boost the ones of the voice of the speaker you want to hear, you may be able to make out what they are saying more easily.

It isn't a guarantee though and if the voices are close, there likely won't be anything you can do other than have someone listen to it with well trained ears that might be able to make it out.

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Basically what you want to do is:

  1. Find the range of frequencies for each person. The main problem is here since frequencies might overlap. You said that one of the speakers is heard through a phone, maybe it will result in more easily separable frequency ranges.
  2. Raise the volume of range of frequencies of the person you want to hear
  3. Lower the other range accordingly.

This is easily done using parametric equalizer which lets you choose any set of frequencies from audio signals, however I doubt there are any such software provided free. Also bear in mind that after all the voice still can be too low to hear\understand if there are too much overlapping frequencies.

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The main problem is that the frequencies overlap. Parametric equalizers, on the other hand, are not rocket science and available in many open-source projects (e.g. Audacity, SoX). –  chirlu Aug 14 '13 at 9:58
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