Re: [Discuss-gnuradio] unable to get sound from alsa sink

[Barry Duggan]

Hi Chris,

You didn't mention your OS or your platform, but this works for a Linux 
system:

Using a terminal screen, enter 'aplay -L'

Here is an excerpt from my Raspberry Pi:

"""
default:CARD=ALSA
    bcm2835 ALSA, bcm2835 ALSA
    Default Audio Device
hw:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct hardware device without any conversions
hw:CARD=Device,DEV=0
    USB Audio Device, USB Audio
    Direct hardware device without any conversions
"""

The Pi has a headphone jack, an HDMI port, and I have a USB audio 
dongle. What you need to do is pick the appropriate entry for your 
system, and the enter the Device Name in the Audio Sink properties. For 
example, I use "hw:CARD=ALSA,DEV=1" to get sound on my monitor.

On Windows or Mac, you might just enter "default:CARD=ALSA".

Good luck,
--
Barry Duggan

On Sun, 25 Aug 2019 17:27:31 -0400, Chris Gorman wrote:

Hello All,

I have been hacking at a python script with an attempt to pass two
frequencies to be added to audio sink.  I can't seem to get any sound
out of the sound card, though.  When I run the script I get "gr::log
:INFO: audio source - Audio sink arch: alsa".  The script follows.  My
python and QT skills are very poor, I simply started with
gnuradio-companion code and tried to hack the result.  Can anyone see
where I might fix this?

Thanks in advance.

Chris

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