How do i get rid of phase problems..

djody · Post by **djody** » Tue Feb 26, 2002 11:02 am

I've made a song ( altitude modulation in the music folder ) And i listen it over a surround set at a frend of mine and the lead sound was going crazy panning from front to back like a stuttering filter.... I believe this is due to phaze problems, but what can i do about it, or where did i go wrong...

Thanks

<font size=-1>[ This Message was edited by: djody on 2002-02-26 11:03 ]</font>

astroman · Post by **astroman** » Tue Feb 26, 2002 1:25 pm

there's a tool to check the mix, something called 'correlation meter'. Afaik it's in the download section (?) too.

subhuman · Post by **subhuman** » Tue Feb 26, 2002 1:27 pm

Just a link... <a href=http://www.planetz.com/forums/viewtopic ... orrelation Meter</a>

emenelton · Post by **emenelton** » Wed Feb 27, 2002 7:44 am

Are you using Dolby pro logic?
If you are, Dolby pro logic decodes by steering elements of the stereo signal to L,C,R+Surround based on differences in the phase relationship between the left and right channel.

djody · Post by **djody** » Wed Feb 27, 2002 4:46 pm

The problem is that i do not use pro logic, but on a pro logic sytem its going mad. So the problem is that i have unwanted phase differance in the stereo signal.
My Question is How do i get rid on this phase problem ( with what kind of tool ) afterwards. or where in the signal path can phase problems be created.. ( I suspect the stereo expanders i use... ? )...

Laterz

Post by **garyb** » Wed Feb 27, 2002 5:06 pm

your mixer allows you to flip phase and most audio editors will do this destructively.be advised that phase is relative and that real audio is a 3 dimensional(actually more that three as time adds a fourth dimension and mathmatically there are more) but your wavefile is only two(amplitude in one direction and time).therefore, when many mics and audio sources are involved,"in phase" is a dynamic,comprimising situation. there may be more than one pleasing solution.also,don't play back audio which is not dolby encoded on a system with dolby engaged and "doubly" is not essential to a good production.(o.k. if you like it)blah blah blah

emenelton · Post by **emenelton** » Wed Feb 27, 2002 8:30 pm

Dolby mixing involves mostly(if not all) mono signals. Place a mono signal on your right channel only, it will play through your right speaker, same with the left channel. Place a mono signal equally on both channels, it will be removed(if you have phantom center turned off and center mode set to normal or wide) from the front left and right, and played on the center speaker. To play through the rear speakers a mono signal is placed in the left channel and the same signal is placed on the right channel but 180 degrees out of phase. When you take your lead sound and put a sophisticated stereo effect on it, that effect will excite the steering circuit of the dolby decoder and cause the effect you expierenced. Building up strong multiple mono tracks is the way to go. Take your lead sound, create a suite of mono effects to your liking and place it dead center in your mix and thats where it will stay. You sould also try voicing the same theme separately on the left and right channels using different sounds and separate takes of the parts. This will give you a stereo feel without 'exciting' the steering. Of course if you really want to get into it you have to mix on a pro logic setup.
Looking foward to hearing a report positive or negative, good luck!

Post by **garyb** » Thu Feb 28, 2002 1:01 am

hmm....it's good to check the mix in mono....

djody · Post by **djody** » Thu Feb 28, 2002 3:46 am

Thanks alot Guy's this is some high profile info your Hammering me with, i'll have to read it a few times cos i'm not engish, but in the essence i get what you both mean, i'm still in the pre-master mix stage so it will take a little while before i get to mastering it again, but with this info it can only become better...

Thanks again, Djody

If there are more people that can enlighten me with more tips it will be welcome, maybe this would make a nice adition to the tips & trich section in the end....

Laterz