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How do you correct 8 ms. out of phase delay on a outdoor recording

Jun 3, 2013 7:27 AM

I recorded an outdoor concert and noticed about an 8 ms delay between the left and right channels (because of mic placement).

 

How would you correct that in CS 6 so the left and right channels line up in phase. autophase correction did not work and to correcting it manually in that function was off the chart so to speak.

 

I tried the standard delay function and entered -4ms for one channel and +4 ms for the other channel.  That seemed to work but is there a better way. 

 

Also what is the calculation to convert samples to msec. in 32 bit, 24 bit and 16 bit. this would get it closer.

 

Thanks

 

Rick

 
Replies
  • Currently Being Moderated
    Jun 3, 2013 9:19 AM   in reply to Rick0725

    Rick0725 wrote:

     

     

     

    Also what is the calculation to convert samples to msec. in 32 bit, 24 bit and 16 bit. this would get it closer.

     

    The bit depth has nothing to do with any timing issue. It's the sample rate that you need for the calculation. So 48kHz sample rate is 48000 samples per second ie. 48 samples per millisecond. So 8 msec = 384 samples.

     
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    Jun 3, 2013 9:30 AM   in reply to Rick0725

    You may want to try Effects > Noise Reduction/Restoration > Automatic Phase Correction  effect.  You can specify a manual shift if you want, but there are plenty of options for automatically aligning the channels

     
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    Jun 4, 2013 12:01 PM   in reply to _durin_

    Auto Phase Correction is an amazing tool, but use it with caution - a stereo source, corrected, can get some squirrly pitch shifting and phase issues when a prominent sound source disappears and reappears in and out of a random phase background.  That's precisely the environment you'll have with separated mics picking up ambient noise of an outdoor event.  Best thing is to test those results by listening in mono as well as stereo.  Another option is to use Effect > Delay and Echo > Delay, setting the controls to the earliest channel to 8 ms, 100% wet mix, and for the later channel the controls to 0.  Still another option is to calculate the exact number of samples the shift is off by zooming way in on a part of the waveform with lots of high frequencies, and use the Delay effect with the "Delay Time Units" down at the bottom of the dialog set to "samples."

     
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    Jun 21, 2013 8:12 PM   in reply to Rick0725

    Thanks for reporting back, Rick, you never know when someone else will pick up on this and be grateful.  And I'm glad you're pleased with the outcome.

     
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