Changes between Version 80 and Version 81 of Old/Tutorials/k0SDR/Tutorial00

Timestamp:

Nov 30, 2007, 4:18:42 PM (16 years ago)

Author:

Joseph F. Miklojcik III

Comment:

corrected numerous problems in audio section

Old/Tutorials/k0SDR/Tutorial00

@@ -148 +148 @@
 To hear remote audio generated by GNURadio with the USRP:
 
-1. Tunnel from local machine to node. The default port to enable is 8000.
-
-2. Install nas 
+1. Install nasd on machine with sound hardware.
 
 {{{
@@ -156 +154 @@
 }}}
 
-and run nasd (server) on the local machine. The local machine should have a way to play sounds locally (soundcard). Start nas daemon on the local machine:
+and run nasd on the machine with the sound making device. Start nas daemon on the local machine:
 
 {{{
-$ nasd :8000 -aa
+sound$ nasd -aa
 }}}
 
-3. Install NAS
+or configure nasd.conf like a sane person and run it from init.d.
+
+2. Install nas clients on node.
 
 {{{
-$ apt-get install nas
-$ apt-get install nas-bin
+node$ apt-get install nas-bin
 }}}
-
-nas-bin package contains a lot of utility programs which names start with "au" like ''auinfo'', ''auplay''...
 
 Set system variable AUDIOSERVER 
 
 {{{
-root@node1-1:~$ export AUDIOSERVER=<ip address of local machine>:0
+root@node1-1:~$ export AUDIOSERVER=<sound making machine>:0
 }}}
-and run auinfo (client) on the remote machine. There should be an output describing all potential audio outputs on the local machine running nasd. Running auinfo is simply a means of checking if the remote connection is working as intended. You can also try "auplay FILE" to actually play sounds remotely.
+and run auinfo (client) on the node. There should be an output describing all potential audio outputs on the local machine running nasd.  You can also try "auplay FILE" to actually play sounds remotely.
 
-4. Modify the gnuradio audio scripts to use NAS libraries. Image "gnuradio_audio.ndz" already has modified audio blocks. Note: if you use the custom image, OSS audio is disabled.
+4. Modify the gnuradio audio scripts to use NAS libraries.
 
-5. Run any example scripts from /gnuradio-examples/python/audio (mono_tone.py, dial_tone.py preferred). Also, any gnuradio script which outputs to audio_sink will work.
-
-Steps 1-3 are necessary for any remote audio applications that use NAS. Step 4 inserts NAS functions into the GNURadio audio block.
-There exists a wrapper library, libaudiooss, that takes all input to /dev/dsp and "pipes" it to NAS. Thus, conceivably, any program that outputs OSS audio can be played remotely. Examples: SoX, mpg123, ... However, libaudiooss currently does not work on the node. If it did, then step 4 could be omitted.
+5. Run any example scripts from /gnuradio-examples/python/audio (for example, mono_tone.py, dial_tone.py). Also, any gnuradio script which outputs to audio_sink will work.
 
 http://www.orbit-lab.org/attachment/wiki/Documentation/GNURadio/gnusound.wav
-
-This is a recording of an AM station that GNURadio demodulated, downsampled, and converted to floats. NAS moved the data from the remote machine to a local machine. So, this is actually a "recording of real-time audio".
 
 == Troubleshooting ==