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January 03, 2009, 04:03:11 AM
66313 Posts in 6739 Topics by 1707 Members
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Topic: Auto Phase Correction  (Read 793 times)
« on: November 03, 2008, 11:28:15 PM »
tcatzere Offline
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Posts: 158



In AA 3.0, which of the "Auto Phase Correction" presets works best for a quick track phase tuneup and repair (if needed)?
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Reply #1
« on: November 04, 2008, 07:28:58 PM »
MusicConductor Offline
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Posts: 1435



Oops...  I was going to help you with this, only to discover that something has eaten my presets!!!  That is not helpful.

Meanwhile, I can say from experience that cranking the settings until you grind your CPU to a halt does improve quality.  It's really a question of how carefully you need it to work and whether or not you can hear the difference.  The only setting that is counter-intuitive is that "Ultra-Slow" is higher in quality than "Ultra Fast."  So play with it and see if you like what you hear.  Monitor the processed portion in both mono and stereo to ascertain what you have for a result.
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Reply #2
« on: November 04, 2008, 11:19:12 PM »
tcatzere Offline
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Posts: 158



Darn . . . really wanted to know about those presets, but thanks for the input anyway.
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Reply #3
« on: November 05, 2008, 08:13:52 PM »
MusicConductor Offline
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Posts: 1435



You know, I think I've got a successful restoration of presets here and only have one for the Auto Phase Corrector, simply labelled "PhaseCorrect" (settings Auto Align, Time Res 3.0, Responsiveness Medium, both channels, Analysis size=256). 

This is not a function like EQ or Noise Reduction where, if you overdo it, audible artifacts can give away that it's been altered.  It really becomes a question of how hard you want your computer to work and how long you're willing to wait for the processing to finish.  The more the effort, the more the likelihood that the phase stays "locked down" between channels.  The max setting is: Auto Align, Time res=1.0, Responsiveness=Ultra Slow, Channel=both, Analysis size=4096.  I'm pretty sure that's the most powerful result; it's simply unnecessary to hit it that hard for everything.
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Reply #4
« on: November 05, 2008, 08:37:45 PM »
tcatzere Offline
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Posts: 158



That's really strange.  In my AA 3, I have four presets in Automatic Phase Correction (under Restoration):  Default, Center Panning, Manual Correction and Repair.
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Reply #5
« on: November 07, 2008, 02:55:45 AM »
MusicConductor Offline
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Posts: 1435



Well, this isn't the first time I've had to do a folder restore, so it looks like my "factory default" presets were fritzed prior to the first restore point.

Someone else want to jump in who still has the real deal?  I'm not inclined to do a full reinstall just now.
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Reply #6
« on: November 07, 2008, 10:32:15 AM »
ryclark Offline
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Posts: 432



You should get them back if you remove or rename the Audition effects settings .xml files from C:\Documents and Settings\Administrator\Application Data\Adobe\Audition\3.0. Audition will then reinstate the defaults when you next open it.
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Reply #7
« on: November 10, 2008, 06:53:52 PM »
MusicConductor Offline
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Posts: 1435



Yep, that worked.  Silly me, I should have known that.  But I've always avoided messing with those things except to make a backup.  Now I have the presets back -- thank you -- and have even successfully edited the XML file to move the 'default' presets into my otherwise good presets file.  All is well.

The "repair" preset is the one closest to what I was expecting for high quality work.  To screw it down even tighter, lower the number of samples for the analysis size.

What's really intriguing to me is the correction of only one channel, which appears to make it then lock down to the other channel, which is left untouched.  For phase correction of a cassette transfer, that might not be helpful if both channels skew around in the normal fashion.  Or maybe it just sounds the same.  In any case, that's a good concept to experiment with.

Understanding the Help file is really important on this one, as those settings details do make a difference.
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Reply #8
« on: November 10, 2008, 11:56:38 PM »
tcatzere Offline
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Posts: 158



Glad you got your presets back.  And thanks again for your comments -- exactly what I wanted to know.

I, too, noticed the correction of one channel only and thought it was interesting.  But I'm sure that what you've concluded to be the reason for it is exactly right.  Thanks for your input. 
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Reply #9
« on: November 13, 2008, 08:06:49 PM »
MusicConductor Offline
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Posts: 1435



I will be playing with this more over the next few weeks as part of a restoration job.  If I learn anything new, I'll chime in again here.
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Reply #10
« on: November 13, 2008, 08:49:54 PM »
tcatzere Offline
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Posts: 158



Thank you.
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