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Audio edit question

U

Undercover_Man

[H]ard Surgeon
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Jan 17, 2010
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Hello. I have a few programs that can edit audio. I have had a question for a long time. I'll try to simplify it:

I have three separate sounds: A, B, C
I also have them combined: ABC
Can I take one of the separate sounds and subtract or isolate it from the combined sound if the combined sound is totally unaltered from the three combined sounds?
So like take B and make it from ABC to AC.

I'm guessing not, but there's still a lot of tools and areas in audio editing that I'm still not familiar with. Just wondering.
 
Yes you can. The way the waves work if you have ABC then the waveforms are a combination of all three atany point. So if you subtract C from the original that you shall just be left with A and B. Its not always perfect for many reasons, and usually depends on how close the waves are to one another. Programs like Izotope Rx are good for this kind of thing. Its quite old, but goldwaves clipboard function (i've forgotten the name of it) is great for that too. I use that lots when remixing other peoples work using the backing track to isolate the vocals from the full track when I dont have seperate chanels. One problem you might find is if anything like compression has been applied because the sound got louder when combined and went above digital 0dB.
 
the trick to doing this is you take for example track C and invert the phase and then combine it with ABC, what will happen is when the C portion of ABC is positive the inverted track C will be negative effectively cancelling out that portion. hopefully that helps.
 
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