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Old December 11th, 2007, 09:57 AM   #1
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Problems with mono sound

Hi

I have created MPEG-2 DVD PAL file in Vegas 7e
It sounds OK on my PC, but when I play a DVD on DVD player (not on the PC), the sound is very soft and distorted.

The project uses sound recorded with mono microphone (Rode NTG-2)

The Audio track is stereo, and I render using default DVD PAL template

I tried to combine both chanels and to render audio as mono, but I get distorted soft sound - very similar to what I hear on my DVD

I have a different clip on the same DVD with normal stereo audio track and it plays OK.

What is wrong?

Thanks
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Old December 11th, 2007, 10:11 AM   #2
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If I change Audio clip Channel to Right (or Left) Only it seems to be OK

Is this the right way to deal with mono sound?
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Old December 11th, 2007, 10:46 AM   #3
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Quote:
Originally Posted by Slava Barouline View Post
If I change Audio clip Channel to Right (or Left) Only it seems to be OK

Is this the right way to deal with mono sound?
Yes.

There can be a couple different problems with summing up two "identical" tracks for a mono mix. If one is even the tiniest bit off the timing of the other... or if one is out of phase with the other, either of these conditions can drastically affect mono compatibility.

The best workflow is to select "right-only" or "Left-only" of a dual-mono track.

In years gone by audio-for-video consoles (mixers) would have a "mono" switch for the monitors so that mono compatibility could be checked instantly.
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Old December 11th, 2007, 08:22 PM   #4
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agree, Sounds like your track is out of phase, so the signals are canceling each other out. Either select the right or left channel ONLY and use that, or try another copy of the "stereo track" that might be phase accurate.

Is this an instrumental track, or just a "stereo" voicer ?

If it's an instrumental track that was recorded in stereo, many of the instruments will be panned to one side or the other, negating most (or all) of your phase problems on those instruments. Only the instruments that are recorded to both sides (center) of the sound spectrum will be drastically effected by the phase cancellation. This, BTW, was the primary principal of the Thompson Vocal Eliminator !

If what you have is a dual track mono ( All items equal in both sides ) and
one side is 180% out of phase with the other, than disaster will happen !

Hard to say without hearing the problem though. Hope this helps, good luck.
Mike
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Old December 12th, 2007, 07:27 PM   #5
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I am happy as long as right only wrks for me

It's voice recorded on Rode NTG-2

I sodlered an XLR to 3.5mm adapter and I suspect the signals are 180 out of phase because I probably soldered hot to one channel and cold to the other
;-)

I will get a Beachtek eventually I guess
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Old December 13th, 2007, 07:05 AM   #6
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XLR adapter

Just make sure the xlr to 3.5mm is wired in this fashion

XLR 1 = shield on 3.5
XLR 2 = Tip and ring on 3.5
XLR 3 = jumper between XLR 1 and 3

this is the proper way for the cable to be adapted (which unbalances the signal), so long runs are inadvisable. but with a beachtec or similar box you will remain balanced between the mic and the box, so longer runs are ok.

Hope this helps
Gerry Gallegos is offline   Reply
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