alsa and sox questions

[Kerry Hoath]

Yes you can do channel fiddling I do this when I am copying 4-track tapes.
You use the pick effect to split out a channel like this:
sox stereo.wav -c1 mono_left.wav pick -l
sox stereo.wav -c1 mono-right.wav pick -r
You need the -c 1  to tell sox to o nly write 1 channel to the output.
If you have a mono wav you _can_ duplicate the left channel like this:
sox mono.wav -c2 stereo.wav
but mono plays in the center of the stereo image and you are simply duplicating data.
The only reason I can see for wanting to turn mon into stereo is if you have
some high quality mono samples you want to play on an audio cd that wants stereo data.
I had to do this with some mono minidiscs so they'd play on a normal cd player without
leaving the right channel silent or playing at the worng sample rate.

Regards, Kerry.
On Thu, Mar 28, 2002 at 10:17:06PM -0600, Gregory Nowak wrote:
> Hi all,
> 
> I've been reading here recently that people have been installing alsa 0.90 beta 11. Where did all of you get that from? The newest thing on the alsa-project.org ftp site is still 0.90 beta 9.
> 
> I also have a sox question. As we know, most audio tapes are recorded to play through both left and right speakers. I think this is defined as left and right channels, but if this isn't correct, please assume that it is throughout this post. Based on reading the sox man page, I think I can do the following, but I need someone to reassure me. 
> 
> Say again that I have a standard audio tape recorded with left and right channels. Is there a way for me to strip one of the channels from a wave file recording of that tape using sox? What I'm asking is if I record this tape as a wave file, can I then strip either the left or right channels from this recording?
> 
> Alternatively, let's say that I already have a wave recording where one of the channels has already been stripped, which leaves me with a left channel only from the original tape. Can I use sox to mix the data on that left channel into both a left and right channels? 
> 
> Please forgive the weirdness of theese questions. However, I really do not care to elaborate why I'm asking them. Yes, it is for a purpose, and depending on what answers I get, I may or may not do what I'm planning, it really is a long story. Thanks for bearing with me, and for any help in advance.
> Greg
> 
> 
> _______________________________________________
> Speakup mailing list
> Speakup at braille.uwo.ca
> http://speech.braille.uwo.ca/mailman/listinfo/speakup
> 

-- 
Kerry Hoath:  kerry at gotss.net kerry at gotss.eu.org or  kerry at gotss.spice.net.au
ICQ: 8226547 msn: kerry at gotss.net Yahoo: kerryhoath at yahoo.com.au