A hack solution would be to delete one of the stereo tracks in post. You'll use only mono in the end anyway, so...
Jan On 1/27/07, J. Rhett Aultman <[EMAIL PROTECTED]> wrote: > > Philip, > > Thanks for the very clear treatment of this information. I didn't know > so much about XLR phase inversion in the signal, but I had started to > figure that the problem was due to the way things were getting combined, > so I did a "Fill From Left" channel, and that had fixed it. Now I know > the more clear solution...and knowing is half the battle! I'll have to > consider another adapter cable or, minimally, just roll with the punches > in post. Thanks for giving me the full picture. > > -- > Rhett > http://www.weatherlight.com/freetime > > Philip Clark wrote: > > >Hi Rhett -- > > > >Sounds like phase cancellation to me. Simply put, when the polarity > >is reversed on one channel of a stereo recording, and the recording > >is summed to mono, then the peaks of one waveform coincide with the > >valleys of the other waveform and they wind up cancelling each other > >out. The result is a drastically quieter signal, maybe even silence, > >depending on the waveforms of the source material. > > > >http://en.wikipedia.org/wiki/Destructive_interference > > > >The technically correct solution would involve using an audio editor > >to invert the polarity on one of your stereo channels, then > >recombining these channels into a new mono file. An even quicker > >solution that would probably work for you in this case would be to > >simply isolate one of your stereo channels, and use that channel by > >itself as your mono mix. > > > >If you don't have access to fancy editing software, you can use > >Audacity, which is freeware. Open your source stereo file in > >Audacity; click the down arrow and select "Split Stereo Track"; click > >the X on one of the resulting tracks to delete it; click the down > >arrow on the remaining track and select "Mono." Export that file, and > >you're done. > > > >If phase cancellation is indeed the culprit, the fault is most likely > >with whatever adapter you are using to go from XLR to 1/8". > > > >XLR cables are meant to be used as mono sources. They send normal- > >and inverted-polarity signals along two of their three pins (using > >phase cancellation as a tool to lessen induced noise). Your 1/8" > >adapter then thinks these signals represent the two channels of a > >stereo sound... which is very much not the case! > > > >Hope this helps. > >-- > >xo philip > >http://swordfight.org > > > >On 27-Jan-07, at 10:54 PM, J. Rhett Aultman wrote: > > > > > > > >>Guys, > >> > >>Our first Sundance video is stalled from being released because of a > >>critical issue that I don't know how to fix! I bought us a new mic to > >>use on the road...it's a handheld Shure that uses an XLR input. I step > >>that down to the 1/8" plug on the camera. > >> > >>The audio sounds beautiful "in the can" and any cut I make of it that > >>has the audio in stereo also sounds great. The moment I ask Adobe > >>Premiere Elements or QuicktimePro to make a mono version of the video, > >>the audio using that specific microphone becomes too quiet to hear. I > >>don't want to put out a stereo version because it'll make the file > >>size > >>pretty big, but the audio for that microphone is borderline silent > >>unless I keep it in stereo! > >> > >>What the heck is going on here, and does anyone know how to fix it? > >> > >>-- > >>Rhett. > >>http://www.weatherlight.com/freetime > >> > >> > >> > >> > > > > > > > >[Non-text portions of this message have been removed] > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > -- The Faux Press - better than real http://fauxpress.blogspot.com [Non-text portions of this message have been removed]
