Re: [Discuss-gnuradio] GNU Radio Companion - ALSA

[Marcus Müller]

Hm, that looks like there's no HW in the list, so that would be an
initial debugging success!

So, the easiest is probably if you just use "pulse" in the Device Name
field.

Best regards,

Marcus


On 19.02.2017 16:15, Robin A. Jensen wrote:
> Yes of course.
> Here we go:
>
> aplay -L
>
> null
>     Discard all samples (playback) or generate zero samples (capture)
>
> pulse
>     PulseAudio Sound Server
> sysdefault:CARD=ALSA
>     bcm2835 ALSA, bcm2835 ALSA
>     Default Audio Device
>
> dmix:CARD=ALSA,DEV=0
>     bcm2835 ALSA, bcm2835 ALSA
>     Direct sample mixing device
>
> dmix:CARD=ALSA,DEV=1
>     bcm2835 ALSA, bcm2835 IEC958/HDMI
>     Direct sample mixing device
>
> dsnoop:CARD=ALSA,DEV=0
>     bcm2835 ALSA, bcm2835 ALSA
>     Direct sample snooping device
>
> dsnoop:CARD=ALSA,DEV=1
>     bcm2835 ALSA, bcm2835 IEC958/HDMI
>     Direct sample snooping device
>
> hw:CARD=ALSA,DEV=0
>     bcm2835 ALSA, bcm2835 ALSA
>     Direct hardware device without any conversions
>
> hw:CARD=ALSA,DEV=1
>     bcm2835 ALSA, bcm2835 IEC958/HDMI
>     Direct hardware device without any conversions
>
> plughw:CARD=ALSA,DEV=0
>     bcm2835 ALSA, bcm2835 ALSA
>     Hardware device with all software conversions
>
> plughw:CARD=ALSA,DEV=1
>     bcm2835 ALSA, bcm2835 IEC958/HDMI
>     Hardware device with all software conversions
>
> If i use @: speaker-test -f 800 -t sinus -r 48000 -c 1-s 1
> I'll get a fine sinus tone.
> So there are sound through the system.
>
> Best regards
> Robin.
>
>
> Den 19-02-2017 kl. 15:48 skrev Marcus Müller:
>> You're right, we should tackle this more systematically.
>>
>> My problem is that I don't have a RPi3 to play around with at hand, so I
>> have to trust you on the "HW:0,0"; it's not a very typical string,
>> through, as most alsa device names are lowercase. Could you share the
>> output of "aplay -L" with us?
>>
>> Best regards,
>> Marcus
>>
>> On 19.02.2017 15:16, Robin A. Jensen wrote:
>>> Hello Marcus.
>>>
>>> Thanks for your reply and your welcomming to the community.
>>>
>>> I've made the changes as suggested.
>>> Also i've made a setup on a Windows 10 machine, to ensure the script
>>> runs.
>>> With the changes the sound is much better! :-)
>>>
>>> But when i run the same setup on RPi 3 / Jessie-distro i've end up
>>> with the same result, no matter what I do with the Audio sink.
>>> I'm using Gnu Radio Companion 3.7.5
>>> The error code is still:
>>>
>>> ALSA libpcm.c2239:)snd_pcm_open_noupdate) Unknown PCM HW:0,0 <-- 10
>>> times this line
>>> gr::log :ERROR: audio_alsa_sink0 - [HW:0,0]: No such file or directory.
>>> File "/home/pi/radio/top_block.py", line133, in <module>
>>>   tb= top_block()
>>> File "/home/pi/radio/top_block.py", line82, in __init__
>>> self.audio_sink_0 = audio.sink(48000, "HW:0,0", True)
>>> File "/usr/lib/python2.7/dist-packages/gnuradio/audio/audio_swig.py",
>>> line 195, in make
>>> return _ausio_swig.sink_make(*args, **kwargs)
>>> RuntimeError: audio_alsa_sink
>>>
>>> I know is alwayes is eassy to blame the software, but could it be a
>>> bug?
>>> As i said. i've tried with all the suggested lines from documentation
>>> of the block.
>>>
>>> Best regards
>>> Robin.
>>>
>>> Den 18-02-2017 kl. 18:17 skrev Marcus Müller:
>>>> Hi Robin,
>>>>
>>>> first of all: Welcome to the GNU Radio community!
>>>>
>>>>
>>>> On 02/18/2017 05:29 PM, Robin A. Jensen wrote:
>>>>> Hello all of you.
>>>>>
>>>>> I've just recieved my RTL-SDR dongle and is all new to this
>>>>> sdr-stuff,
>>>>> so please bear over with me, if i'm at the wrong place.
>>>>> I'm using GNU Radio Companion on a RPi 3 and no mather what i'll
>>>>> do, i
>>>>> can't get the sound to work.
>>>>> If a'im using rtl_fm and aplay, i'll get sound but it won't set on
>>>>> the
>>>>> radiostation.
>>>> aha, so that's good, the sound system as it does work.
>>>> You'll probably want to use "aplay -L" to find the possible ALSA
>>>> device
>>>> names that you can use in the GNU Radio Audio sink.
>>>>> I'll take on that later.
>>>>> I've createt a small FM Reciever in GNU Radio companion and everytime
>>>>> i'll execute the script i'll get an error:
>>>>>
>>>>> RuntimeError.audio.alsa.sink
>>>> Hm, I've never seen a GNU Radio error being printed like this; but
>>>> that
>>>> might just be me. However, I can't reproduce this error printing shape
>>>> as hard as I try.
>>>>> I've been all over the internet to find a solution but with no luck.
>>>>> So now i'm have a hope that this mailling list can help me?
>>>>>
>>>> My suspicion is that your audio device doesn't like the sampling rate
>>>> your trying to use, or you need to specify a device name (or both).
>>>> Can
>>>> you make things work on the PC you use to design these flow graphs?
>>>>
>>>> I'd start with a signal source (sampling rate == the sampling rate
>>>> that
>>>> you set in your Audio sink), configured to produce a "float" output
>>>> sine
>>>> of 1 kHz, directly connected to an Audio sink. If that works, move on.
>>>>
>>>> --------------------------------------------------------------------------------
>>>>
>>>>
>>>>
>>>> What I say about the flow graph in the following has, as far as I can
>>>> tell, nothing to do with the error you're getting. Still, there's
>>>> mistakes in the flow graph that would make it impossible to
>>>> successfully
>>>> run it, and thus I'd like to avoid frustration later on by pointing
>>>> them
>>>> out know:
>>>>
>>>>
>>>> So, the main issue with your flow graph is that the sampling rate
>>>> at the
>>>> audio sink must be what you configured your audio sink for (48 kHz).
>>>> But: that rate is the result of your SDR's sampling rate (2MS/s),
>>>> multiplied with all interpolations, divided by all decimations in the
>>>> path between.
>>>>
>>>>> My setup is:
>>>>> RTL-SDR Source: samplerate:  2M, frequency 96.5 MHz ->
>>>>> Rationel Sampler: Interpolation 4, Decimation: 1 ->
>>>> Uh, that means that you have now 8MS/s. That seems unnecessary,
>>>> since to
>>>> capture a <100 kHz wide FM channel, you wouldn't even need the 2MS/s
>>>> you get
>>>>> Low Pass Filter: Sample rate: 2M, Cutoff freq: 100K, Transition
>>>>> Width:
>>>>> 100k ->
>>>> Which contradicts the 2MS/s used here, so you're actually getting
>>>> 400kHz
>>>> passband width, 400kHz transition width. Also, this feels like a prime
>>>> candidate for including decimation in the filter (because the
>>>> resulting
>>>> bandwidth is 200 kHz (if you overlap the two transition widths),
>>>> and for
>>>> that you'd only need 200 kS/s of complex digital signal).
>>>>> WBFM Recive: Quadrature: 500K, Audio Decimation: 1 ->
>>>> This is now off by a factor of 16; are you sure you should be using
>>>> "interpolation=4,decimation=1" instead of the inverse?
>>>>> Rationel Sampler: Interpolation: 500
>>>> Certainly not :) 8 MS/s · 500 = 4 GS/s
>>>>> Decimation: 48
>>>> Aside from that not even having greatest common denominator of 1 with
>>>> 500 (you can't know that this is important, not blaming you), this
>>>> would
>>>> give you an output sampling rate of 4GS/s/48 = 1 GS/s / 12 = 83.333
>>>> MS/s. Which isn't even a multiple of 48 kHz, which you use in the
>>>> audio
>>>> sink:
>>>>> ->
>>>>> Audio Sink: Sample Rate: 48 KHz, Device Name: HW:0,0
>>>>>
>>>>> I've found that recipie on a Hack5 video and there it's working
>>>> I think there's some error in the way you configured these
>>>> resamplers. I
>>>> don't know the Video you're referring to, but the amount of rational
>>>> resamplers used here alone, paired with the fact that you don't
>>>> decimate
>>>> in the WBFM receiver makes me kind of suspicious this might not have
>>>> been the optimal video to take reference designs from!
>>>>
>>>> --------------------------------------------------------------------------------
>>>>
>>>>
>>>>
>>>> Best regards,
>>>> Marcus
>>>>> With best regards
>>>>> Robin.
>>>>>
>>>>>
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