fixing dc offset from mono recordings.

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elijahlucian
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2013/01/20 22:43:57 (permalink)

fixing dc offset from mono recordings.

hey all. 

I am recording some voice over stuff and i am getting some dc offset and just wondering how to fix it.

I am recording voice using a rode nt-2a thru a Focusrite ISA-One preamp. 

here is a pic of it

http://www.elijahlucian.ca/dcoffset.jpg

I heard that putting an "allpass" filter on it would fix it. but I don't know where to find said filter in Sonar...

I also heard that using a hi-pass at 30hz would do the trick but I tried it with no success. (36db slope)

any suggestions? I am trying to get really loud voiceover stuff, but this dc offset is taking almost 10db of energy away in some cases...




Running X2a 64bit - RME Fireface UFX - Win 7 64 - i7 3770k - 32gb ram

Me http://www.elijahlucian.ca
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    scook
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    Re:fixing dc offset from mono recordings. 2013/01/20 23:02:11 (permalink)
    Process > Apply Effect > Remove DC Offset The documentation discusses how to use this during and after recording.
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    elijahlucian
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    Re:fixing dc offset from mono recordings. 2013/01/21 00:30:37 (permalink)
    thanks for the tip, but unfortunately that had no effect on the audio... 

    I read the page on the documentation, tried a couple different thresholds etc... nothings seems to be working. 


    Running X2a 64bit - RME Fireface UFX - Win 7 64 - i7 3770k - 32gb ram

    Me http://www.elijahlucian.ca
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    bvideo
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    Re:fixing dc offset from mono recordings. 2013/01/21 09:32:44 (permalink)
    An asymmetric appearance of a wave does not prove DC offset. What counts is the area between the top part (>0) and zero of the wave vs. the bottom part, not the height. That would be pretty hard to judge by eye. But if you zoom out, it's possible you would be able to see that the negative "peaks" are wider than the positive peaks. An audio file editor, like Sound Forge, would be able to show you the numerical value of DC offset, if you don't trust Sonar's "remove" process.
    post edited by bvideo - 2013/01/21 12:25:57
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