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Removing differences between two tracks

 
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bru.db



Joined: 09 Jul 2007
Posts: 5

PostPosted: Thu May 22, 2014 4:14 am    Post subject: Removing differences between two tracks Reply with quote

Here's what I'm doing... Recording a mono LP using a stereo cartridge. I end up with a stereo track in Amadeus.

L: music + left channel LP pops
R: music + right channel LP pops

Here's what I want to do... combine music from L and R, but not the LP pops.
How can I accomplish that?

If I invert one channel and combine the two tracks, I'll end up with only the left and right channel LP pops. I want to do the exact opposite of that.
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Jim Edgar



Joined: 01 Mar 2010
Posts: 95

PostPosted: Mon May 26, 2014 5:54 am    Post subject: Removing differences between two tracks Reply with quote

Just guessing, but couldn't you then take the L/R channel LP pops track you describe, invert that and then combine with the original?
Jim Edgar

jimedgarvoices@gmail.com (jimedgarvoices@gmail.com) - @jimedgarvoices
http://www.jimedgarvoices.com  -  http://about.me/jimedgar




On Sun, May 25, 2014 at 9:22 AM, bru db <forum2mail@hairersoft.com (forum2mail@hairersoft.com)> wrote:
Quote:
Here's what I'm doing... Recording a mono LP using a stereo cartridge. I end up with a stereo track in Amadeus.

L: music + left channel LP pops
R: music + right channel LP pops

Here's what I want to do... combine music from L and R, but not the LP pops.
How can I accomplish that?

If I invert one channel and combine the two tracks, I'll end up with only the left and right channel LP pops. I want to do the exact opposite of that.




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Martin Hairer
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Joined: 08 Nov 2006
Posts: 1615

PostPosted: Mon May 26, 2014 7:50 am    Post subject: Removing differences between two tracks Reply with quote

I do not think that theres an obvious way of achieving this: say your clean signal is S and the pops in the L/R channels are PL and PR. The two channels of the record are now

L = S + PL and R = S + PR.

As you mention, by inverting one of them and combining, you get

L - R = PL - PR,

so the signal is gone and only pops remain. You can see however that there is no direct way of combining the two channels that just gives you S back Have you tried removing the pops by using the repair centre? Regards,

Martin

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http://www.hairersoft.com/



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bru.db



Joined: 09 Jul 2007
Posts: 5

PostPosted: Tue May 27, 2014 2:27 am    Post subject: Removing differences between two tracks Reply with quote

Martin, thanks for the reply.

I haven't been completely satisfied with the results when using repair centre. I'd rather listen thru the LP pops than loose any amount of music.

I usually interpolate big pops if they really bother me. Otherwise, I just let it be.
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JEGG



Joined: 24 Feb 2007
Posts: 121

PostPosted: Thu Jun 05, 2014 9:59 pm    Post subject: Reply with quote

Hello bru:
Your question re: "extracting the center" is a very good one, as this is not done by summing or subtracting right/left.

There are applications that offer "center extraction," but I have no idea how this is achieved.

I have one of those - Rx3 - and the feature is specifically oriented toward mono cleaup. It also offers separation of noise and tonal components, too, which is also extremely useful for the sort of background "grunge" that's present on vinyl. Unfortunately, these features are included in the Advanced version only, that's an extremely expensive application.

For far less pricey general cleanup chores, you might try the "non advanced" version of Rx3, and may open up all sorts of "cleanup vistas." It offers sophisticated, very fast removal of ticks, pops, thumps.

With the right settings, you will not loose any music. More importantly, you can audition only the clicks and pops removed, and thus if there is any transient musical material removed, you'll hear exactly what it is. Then you can revise your settings.

You might find both the Declick function and the Peak Repair function (a true wonder!) useful in actually rebuilding as well as repairing damage of program material. Almost everything in Rx can be used for purposes other than their primary function.
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