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#86384 - 06/06/02 10:20 PM Phase problem. Is there a cure?
Dan Weiss Offline
Founding Member

Registered: 07/20/99
Posts: 3615
Loc: New York NY USA
I recorded my wife singing with acoustic guitar on a song which was supposed to be nothing more than a reference, just so we'd knew what we wrote a few days later. I had up a couple of mics, one on the guitar and one for the vocal. I didn't do any check for phase, in fact I barely did anything but hit record. Of course, as you might have guessed, it was a particularly great vocal performance. Unfortunately, there's considerable vox leakage into the guitar mic, and the phase problem is quite noticable.

This is a serious bummer, and I'd love to salvage this track if I can. I've tried reversing the phase on the guitar mic and shifting one of the tracks up and back a few samples. Neither of these helped at all. Also, it's not the kind of guitar part that she'd be able to do over.

If anyone has an idea of how I might fix this, I'd appreciate the suggestion.

Thanks,

Dan

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#86385 - 06/06/02 11:03 PM Re: Phase problem. Is there a cure?
Nick Batzdorf Offline
Founding Member

Registered: 04/15/99
Posts: 11960
Loc: Los Angeles, CA, USA
The first thing I'd try is to line up the vox track with the vox leakage, zooming way in to get it spot on. Just moving things around a few samples or reversing the phase isn't accurate enough.

If that doesn't work - in other words if there's also a lot of guitar in the vocal track - try taking a copy of the vox track, lining it up with the vox waveform in the guitar track, and then reversing its phase.

This should remove a good amount of the vocal in the guitar track, but how much it'll take with it I don't know.

You can also try the reverse to remove guitar from the vocal track.

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#86386 - 06/06/02 11:54 PM Re: Phase problem. Is there a cure?
Dan Weiss Offline
Founding Member

Registered: 07/20/99
Posts: 3615
Loc: New York NY USA
Thanks Nick,

I'll try these ideas. There's not a lot of guitar in the vocal track. Maybe lining it up more accurately is what's needed. --Dan

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#86387 - 06/07/02 02:06 AM Re: Phase problem. Is there a cure?
Tim Offline
Founding Member

Registered: 06/02/00
Posts: 2241
Loc: Woodland Hills Ca. :eek:
What if you delay the guitar track several (10 - 25) milliseconds? That of course would put an "effect" on the vocal, but it might be better than out of phase. Then maybe delay the gtr again, and pan 'em hard!

I think your wife can sing and play it again though.

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#86388 - 06/07/02 05:21 AM Re: Phase problem. Is there a cure?
NYC Drew Offline
Member

Registered: 02/09/02
Posts: 50
Loc: Metro Area, NYC
Given that the vocal performance is the better of the two, why not get another take of the a. guitar

NYC Drew

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#86389 - 06/07/02 06:01 AM Re: Phase problem. Is there a cure?
jeremy hesford Offline
Founding Member

Registered: 05/06/99
Posts: 6219
Loc: odenton md.
I'm currently mixing a band where everything was tracked with a 184 on an acoustic and a Rode Classic on the vox at the same time.

What I did to improve the phase or just the overall sound was pan the GTR track to L4 and the vocal to R3. Them put a .6 delay between them. This greatly improved the sound and lessened the hollowness in the vocal. Also adding a small room verb helped smooth it out.

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#86390 - 06/07/02 12:23 PM Re: Phase problem. Is there a cure?
Dan Weiss Offline
Founding Member

Registered: 07/20/99
Posts: 3615
Loc: New York NY USA
Thank you for your suggestions. I spent a little time on this today but need more. I did zoom way in on the sample and shifted the track and it seemed to help significantly. For some reason the track seems to line up differently at different sections of the song. Maybe because she was moving around, I'm not sure. But I guess I'll break the track down into sections and slide them in place as needed.

The effect on the voice idea is good, but would not be appropriate for this song and setting, which is pretty raw.
And because it's a finger picking guitar part that goes in and out of time, she would not be able to match it.

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#86391 - 06/07/02 12:39 PM Re: Phase problem. Is there a cure?
Tim Offline
Founding Member

Registered: 06/02/00
Posts: 2241
Loc: Woodland Hills Ca. :eek:
 Quote:
Originally posted by dweiss:

And because it's a finger picking guitar part that goes in and out of time, she would not be able to match it.
VocAlign!

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#86392 - 06/07/02 08:10 PM Re: Phase problem. Is there a cure?
Dan Weiss Offline
Founding Member

Registered: 07/20/99
Posts: 3615
Loc: New York NY USA
Please say more...

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#86393 - 06/08/02 01:07 AM Re: Phase problem. Is there a cure?
Tim Offline
Founding Member

Registered: 06/02/00
Posts: 2241
Loc: Woodland Hills Ca. :eek:
 Quote:
Originally posted by dweiss:
Please say more...
I was kinda kidding but who knows.

Vocalign is a time compression/expansion software originaly developed for ADR (automatic dialog replacement). When an actor comes in to re record his/her lines, and they're not in sync with the original recording (and the lip movement on film), Vocalign will compare both waveforms then line up the new with the original. It can also be used for tightening up BGs and vocal doubles (great, more ****ing perfection).
I'm not sure how it would handle an ac gtr part like yours, esp with the vox in the track. It aint cheap either.

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