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Re: [Discuss-gnuradio] How to specify Audio Source device_name?
From: |
Cinaed Simson |
Subject: |
Re: [Discuss-gnuradio] How to specify Audio Source device_name? |
Date: |
Wed, 21 Sep 2016 12:40:59 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
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).
>
>
>