On 09/21/2016 09:40 AM, Paul Zander wrote: > Cinaed, > > Your suggestion about testing the audio suggested an new experiment that > may be a work-around. > > With Settings >> Sound >> Input >> Internal Microphone, my GRC with (QT > GUI Time Sink) shows a signal that responds to the internal microphone. > Speaking or clapping hands causes a response on the graph. > > When I change the Input to Microphone, USB Audio Device, and re-execute > the flowgraph, the signal is very small and does not respond to > sounds. Maybe Audio Source only works with the default input from the > system.
Use the PulseAudio Volume control to turn up the volume on the input device. You can find the find the input device under Inputs. > > See additional comments below. > >>On 9/21/2016 1:22 AM Cinaed Simson wrote: >> >>> On 09/20/2016 11:23 PM, Paul Zander wrote: >> >>> 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. >>> >>> downloaded ubuntu-14.04.5-desktop-amd64-gnuradio-3.7.10.1.iso and am >> running it “live” off a USB stick. >> >>Type >> >> groups >> >>You should be member of pulse, pulse-access, and audio at the minimum. > > Ah, exactly where am I supposed to type "groups"? > > Am I being naive to expect that a live distribution named gnuradio > would have all of the required dependencies? > >>> >>> When the USB dongle is installed, >>> `arecord -l` >>... >>> 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 >>> >>> >> >>Are hw:1,0 or plughw:1,0 ones you thought of? > > Yes. Those were my first choices. > > >>In any case, pulseaudio is probably controlling the device. Under >>Multimedia, start PulseAudio Volume Control and click on the device it >>displays and it should drop down a menu with both devices. Select the >>device you want. >> >>Confirm the device actually works. >> > > I am running ubuntu-14.04.5-desktop-amd64-gnuradio-3.7.10.1.iso > There is no "Multimedia", but under system settings, there is "Sound" > It shows the USB Audio Device (when it is plugged in). > > > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
