Mr. Clark is absolutely correct. Jan
On 1/27/07, Philip Clark <[EMAIL PROTECTED]> 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 > > > > -- The Faux Press - better than real http://fauxpress.blogspot.com [Non-text portions of this message have been removed]
