[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Audio i/o
From: |
edA-qa mort-ora-y |
Subject: |
Re: Audio i/o |
Date: |
Thu, 23 Dec 2004 10:55:03 +0100 |
User-agent: |
Mozilla Thunderbird 0.8 (X11/20040913) |
Jose Colmenares wrote:
I want to play, using my soundcard, a certain signal.
I could generate the signal, and play it using the
playsound command. Nevertheless, how do I put the
vector in the correcto format? I've searched the web,
Do you need to play them from directly within Octave? If not, then here
is a solution. If yes, then well, use the same advice and simply call
the "system" function. ;)
If you are generating waveforms it is probably fairly convenient for you
to use floating point samples. These samples should be in the range
[-1,1] as that is what a typical sound-card, and the playing system are
expecting. Your vector is a normal Octave vector (one-row) in time
offset order t(1) is first sample, t(2) is second, ...
Once you have a vector you need to write it to a file. You can do this
with a command like:
fwrite( handle, data, "float" )
The "float" instructs it to write in the float format, which should be
32-bit floating point.
Now, for Linux:
Once you have a file you can play it using the program "sox" and
"esdcat". esdcat is installed on most new Linux installs, sox may need
to be additionally installed. RUn this command:
sox -t raw -l -f -r 44100 filename -c 1 -s -w -t raw - | esdcat -r
44100 -m
This converts your RAW file forward into something esdcat can use, and
then it plays it. Replace 44100 with the appropriate byte rate. The
docs on sox/esdcat explain the rest of the options.
Now, for Windows:
Well, from the command line I don't know what to do, but maybe esdcat is
also ported... otherwise open your file in something like CoolEdit and
let it play it.
--
edA-qa mort-ora-y
Idea Architect
http://disemia.com/
-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.
Octave's home on the web: http://www.octave.org
How to fund new projects: http://www.octave.org/funding.html
Subscription information: http://www.octave.org/archive.html
-------------------------------------------------------------
- Audio i/o, Jose Colmenares, 2004/12/22
- Re: Audio i/o, Robert A. Macy, 2004/12/22
- Re: Audio i/o,
edA-qa mort-ora-y <=