soundsubs
June 3rd 04, 11:04 PM
Yesterday, I was playing around in Sonar, trying to isolate vocals for
a remix. I imported a stereo 128k mp3 into 2 seperate audio tracks
(stereo split). I panned each of the tracks to center. I flipped the
phase on one track only to 180 out and voila, most of the vocals
jumped out, most of the music died. I couldnt believe it! I have been
trying to get a solution for this for oh, say about 159 years! Then I
thought about it and realized that MPEG encoding (mpeg layer 3) does
some sum/difference algorythms to get a smaller file. I think i
remember that one algo. uses a mono channel and then the other channel
is actually only the difference between the two.
So the next thing I tried was to do this on other MP3's I had, rips
from cd's of course. Strangely, my mileage varied, as one track had
the exact opposite--- out of phase strengthened the mono channel,
flipping it killed it. im guessing this has everything to do with the
mpeg encoding itself... On a .wav file, leaving left/right tracks and
flipping phase will cancel mono and leave stereo, NOT the other way
around.
try it out and see what happens. your mileage may vary.
i am curious to hear/read what other people say about this--- perhaps
its the solution ive been waiting for and searching for forever.
---shane
a remix. I imported a stereo 128k mp3 into 2 seperate audio tracks
(stereo split). I panned each of the tracks to center. I flipped the
phase on one track only to 180 out and voila, most of the vocals
jumped out, most of the music died. I couldnt believe it! I have been
trying to get a solution for this for oh, say about 159 years! Then I
thought about it and realized that MPEG encoding (mpeg layer 3) does
some sum/difference algorythms to get a smaller file. I think i
remember that one algo. uses a mono channel and then the other channel
is actually only the difference between the two.
So the next thing I tried was to do this on other MP3's I had, rips
from cd's of course. Strangely, my mileage varied, as one track had
the exact opposite--- out of phase strengthened the mono channel,
flipping it killed it. im guessing this has everything to do with the
mpeg encoding itself... On a .wav file, leaving left/right tracks and
flipping phase will cancel mono and leave stereo, NOT the other way
around.
try it out and see what happens. your mileage may vary.
i am curious to hear/read what other people say about this--- perhaps
its the solution ive been waiting for and searching for forever.
---shane