Re: [Discuss-gnuradio] How to specify Audio Source device_name?

[Cinaed Simson]

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).
> 
> 
>