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

[Paul Zander]

So HW:1,0 does work on a "sink". Possibly, the documentation was just copied over to source, but maybe not actually implemented yet...  If so, that should be on the bug list.

BTW, my signals happen to be of audio frequency range, but not really sounds.

I was hoping that I could eventually have one source using "HW:1,0" and another "HW:2,0", HW:3,0 ... to have multiple inputs without having to buy a sound card with several  "stereo microphone" inputs.  

For now, my one channel input is working very well.

---

From: Cinaed Simson <address@hidden>
To: GNURadio Discussion List <address@hidden>
Sent: Friday, September 23, 2016 12:56 PM
Subject: Re: [Discuss-gnuradio] How to specify Audio Source device_name?

On 09/22/2016 12:06 PM, Paul Zander wrote:
> Problem solved.  I used the Sound GUI under the Settingsmenu to select
> the audio source. 
> I am not sure if that is PulseAudio, but the selections and gain
> settings do work.
>
> I even found that I could switch the device while the flowgraph was running.
>
> That said, I am puzzled about the intended usage of HW:1,0 and and
> similar device names.

It occurred to me last night where hw:1,0 is used - it can be used as
the device in the audio sink in grc.

I just tried it and it works.

> Suppose I create |~/.asoundrc |following the instructions at:
>  http://gnuradio.org/redmine/projects/gnuradio/wiki/ALSAPulseAudio
> |
> |
> |Then should I be able to specify the device name in GRC
> |
> |and not have to rely on the audio setings?
> |
>
>
> On 09/21/2016 12:40 PM,Cinaed Simson wrote:
>>
>> 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.


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