Question about making mono from stereo

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Question about making mono from stereo

Permanent link to this post Posted by pdun459 » Wed Jan 03, 2018 5:14 pm

I can see two ways of making a mono track from stereo:

1. Menu Bar>Tracks>Stereo Track to Mono
or
2. Track Control Panel>Dropdown Menu>Split Stereo to Mono. Then export one of the two mono tracks.

I was wondering if method one has any advantages over two? Two is a lot faster, just wondering if quality should be about the same. It's an ebook mp3, mostly voice.
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Re: Question about making mono from stereo

Permanent link to this post Posted by steve » Wed Jan 03, 2018 5:50 pm

pdun459 wrote:1. Menu Bar>Tracks>Stereo Track to Mono

This "mixes" the left and the right channels to create a single mono track. This is most useful when the stereo track has very different left / right channels and you want both sides in the mono version.

pdun459 wrote:2. Track Control Panel>Dropdown Menu>Split Stereo to Mono. Then export one of the two mono tracks.

This literally splits the stereo track so that the upper (left) channel of the stereo track becomes one mono track, and the lower (right) channel becomes another mono track.
This is particularly useful if you have a stereo recording with one good channel and one bad channel. You would (of course) discard the bad channel. It is also useful when the two channels in the stereo track are the same, or very nearly the same, because it is so much quicker than mixing down to mono.
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Re: Question about making mono from stereo

Permanent link to this post Posted by pdun459 » Wed Jan 03, 2018 7:04 pm

Thanks for that very good explanation. Is there a way to analyze each track to see how similar they are? The look the same and basically sound the same. It's an ebook so I assume they're basically the same, but I'd be curious analyze them in a more precise way. Thanks.
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Re: Question about making mono from stereo

Permanent link to this post Posted by steve » Wed Jan 03, 2018 10:42 pm

pdun459 wrote:I'd be curious analyze them in a more precise way.

A fairly quick and easy way:
1) Select the track.
2) Apply the "Vocal Remover" effect with default settings (as shown here: http://manual.audacityteam.org/man/vocal_remover.html)
Whatever is left, is the mathematical difference between the two tracks.

A more precise (but much slower) way is to use the "Analyze" option in the "Vocal Reduction and Isolation" effect: http://manual.audacityteam.org/man/voca ... ation.html
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Re: Question about making mono from stereo

Permanent link to this post Posted by pdun459 » Thu Jan 04, 2018 3:07 pm

That's excellent. The files I've tested so far are virtually the same on both tracks. Thank you very much, Audacity's awesome.
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