Date: Wed Jun 10, 2009 4:30 pm ((PDT))
Where the original files two channel mono or true stereo?
If they were indeed stereo you are losing the information for one
channel. It sounds like they were two channel mono (the same signal
going to both channels). When you convert to a mono file you will
still here the sound from both the right and left channel.
Nature Images and Sounds, LLC
The Songs of Insects
On Jun 10, 2009, at 6:26 PM, Juan Mazar Barnett wrote:
> Dear alls,
> I noticed something odd, and I=B4ll try to explain.
> I received large audio tape files of bird recordings made on
> cassettes. They were digitised by the Cornell Lab.
> They are stereo (S) files, and very heavy, c.60Mb, and slow to work
> When I open them in Adobe audition or a Cool Edit, I get the two
> horizontal bands or chanells of course (left and right). So I tried
> something, that worked, to make the files smaller. I did "select all",
> to select the 30 min of uninterrupted recording (representing a
> cassette side), copied it, and pasted it on a new file which I chose
> to be mono. Sure enough, I now see only one band or channell (be it
> waveform or spectral) and the new file is c.30Mb. I still hear it as S
> ! (beats me why this happens, but it is a relief...).
> Now, I noticed that instead of "painting" or selecting all of the
> screen, I can just paint one of the two bands alone. And repeat the
> same process, paste it in a new mono file, and save it as such. As in
> the earlier exaple, the waveform display of that single band now
> covers the whole screen.
> And sure enough, now the new file instead of being half the original
> 60Mb monster is now c.15Mb (!!!!!!!!!). And of course it also beats me
> why it STILL sounds in stereo...
> So, besides the question of how come this happen, I wonder if it is ok
> to do this, if I loose a lot of "info" downsizing each file twice or
> four times (from 60 to 15 Mb), or if there are any problems.
> A 15 MB file is a lot easier to handle of course!
> Sorry for the lenghty explaination, I hope I was clear and that some
> of you may be able to enlighten me,