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Subject: Identifying changes in vocal audio
Posted by: rcraighogan
Date: 1/28/2015 9:56:01 AM

I need to identify changes in voice audio by comparing the original with a version containing changes. They are identical except for some responses inserted into a recording of the original audio. I understand I can do something to merge the original and changed versions so whatever is in the original is cancelled out and only the changes remain. Does anyone know anything about that?

Craig

Subject: RE: Identifying changes in vocal audio
Reply by: Iacobus
Date: 1/28/2015 1:05:02 PM

If they are identical minus the changes, you could mix the original and the one with the changes together using the "invert data" command. It's as easy as dragging one waveform onto the other to initiate the process.

SpectraLayers Pro may be able to help you out here too, though it has a learning curve to learn its UI. If you have the Audio Master Suite, it's included.

Subject: RE: Identifying changes in vocal audio
Reply by: Chienworks
Date: 1/28/2015 4:06:19 PM

Did the inserts add time to the file, making it longer? If so, then the entire rest of the file starting at the first change is going to show up as "changed". This will make it a much more manual effort.

Rather than trying to use the cancellation i'd line the two files up in Vegas on separate tracks and play them along until you hear something different. Put a marker there and split the original track, then drag what's left of the original track forward until it once again lines up with the new track. Put another marker there. Repeat until you've reached the end of the file. You'll now have pairs of markers and visible gaps at each of the inserts.

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