First, I want tothank the group for the wonderful tutorials on GNU Radio Companion. My problem needs touse an external signal as the Audio Source. GNURadiodefaults to using the microphone in the laptop. I added an externalUSB/audio device to connect the external signal. After unsuccessfullytrying 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 dongleis 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 adevice /dev/hidraw1. So the systemrecognizes the device when it is present. The documentationfor Audio Source says: The specificaudio 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 triedevery 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 theidentical results on a different computer running Debian testing (akasqueeze) and GRC 3.7.10 Google could not find any helpful information for this error message.
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