First, I want to
thank the group for the wonderful tutorials on GNU Radio Companion.
My problem needs to
use an external signal as the Audio Source. GNURadio
defaults to using the microphone in the laptop. I added an external
USB/audio device to connect the external signal.
After unsuccessfully
trying several other ways to run GNUradio, I downloaded
ubuntu-14.04.5-desktop-amd64-gnuradio-3.7.10.1.iso and am running it
“live” off a USB stick.
When the USB dongle
is installed,
`arecord -l`
...
card 1: Device
[C-Media USB Audio Device], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0:
subdevice #0
Also there is a
device /dev/hidraw1.
So the system
recognizes the device when it is present.
The documentation
for Audio Source says:
The specific
audio device to use can be specified as the device_name parameter.
Typical choices are:
- pulse,
hw:0,0, plughw:0,0, surround51, /dev/dsp
Well, I have tried
every variation of the above I and think of. No entry and “pulse”
use the internal microphone. Everything else returns:
RuntimeError:
audio_alsa_source
I repeated the
identical results on a different computer running Debian testing (aka
squeeze) and GRC 3.7.10
Google could not find any helpful information for this error message.