|Subject:||Re: [Discuss-gnuradio] GNU Radio Companion - ALSA|
|Date:||Sun, 19 Feb 2017 17:27:35 +0100|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1|
Hi Robin, I think that the PI audio hardware is stereo.So set in your audio sink the number of inputs to to and than connect the second input channel to the same port of the preceding port the first channel is connected to.
-- Volker Am 19.02.2017 um 17:17 schrieb Robin A. Jensen:
Hello Volker My audiosink is in mono. 1 input. If I put in a 2. Rationel Sampler and gonnect it's input to WBFM Revicer and then put Rat. Samp. 2 to a second input on audio sink, i'll get: RuntimeError: audio_alsa_sink don't know another way to make WBFM into 2 channel? Best regards Robin. Den 19-02-2017 kl. 17:05 skrev Volker Schroer:Hi Robin, that means , you got the correct device name, but your selected topology is wrong. That happens for example if you provide one input to a stereo device. -- Volker Am 19.02.2017 um 16:52 schrieb Robin A. Jensen:Hello Volker It will still create error: RuntimeError: check topology failed on audio_alsasink(8) using ninputs=1, noutputs=0 Best regards Robin. Den 19-02-2017 kl. 16:44 skrev Volker Schroer:Robin, try to use hw:0 or plughw:0 as device string. The hardware device must be written in lowercase. If I user uppercase I get the same error as you reported. ALSA lib /var/tmp/portage/media-libs/alsa-lib-1.1.2/work/alsa-lib-1.1.2/src/pcm/pcm.c:2450:(snd_pcm_open_noupdate) Unknown PCM HW:2,0 ERROR: [HW:2,0]: Datei oder Verzeichnis nicht gefunden If in lowercase: audio_alsa_sink[hw:2,0]: using S32_LE -- Volker Am 19.02.2017 um 16:15 schrieb Robin A. Jensen: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.sinkHm, 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 getLow 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: 500Certainly not :) 8 MS/s · 500 = 4 GS/sDecimation: 48Aside 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 workingI 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, MarcusWith best regards Robin. _______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio_______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio_______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio_______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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