Re: [Discuss-gnuradio] Soundcards / alsa block / sample rates

I solved the problem.

The issue was an overdriven amplifier because the output gain was to high and so there are a lot of noise and phantom signals.

Gesendet: Freitag, 25. September 2015 um 23:12 Uhr
Von: "Andreas Ladanyi" <address@hidden>
An: "Marcus Müller" <address@hidden>
Cc: address@hidden
Betreff: Re: [Discuss-gnuradio] Soundcards / alsa block / sample rates

Hi Marcus,

i changed the audio_sink.xml and add the sample option of 192k sample rate. Now ich could choose them in the flow graph. The parameter seems to be set by alsa because the alsa output on the terminal tells me nothing about setting a lower sample rate below 192k in the device.

The device is: hw,HD,0

Now im wondering because there should be signals from 57 khz to 76 khz and not more. If i put my speakter to the soundcard i can hear signals. If i remember corretly all signals over 25khz couldnt be heared ?!

The FFT Sink of gnuradio shows the signals correctly between 57 khz and 76khz.

regards,

Andy

Gesendet: Montag, 21. September 2015 um 22:39 Uhr
Von: "Marcus Müller" <address@hidden>
An: address@hidden
Betreff: Re: [Discuss-gnuradio] Soundcards / alsa block / sample rates

What device string are you using?

On 21.09.2015 22:32, Andreas Ladanyi wrote:

Hi Tom,

> I'm not sure that I understand. What "alsa block"? Are you talking about the audio source/sink blocks? And I'm assuming you mean inside GRC?

Yes, sorry, I mean the audio sink block which talks to the alsa system.

>The sample rate of this blocks is a combo box that is editable, which means you can set your own value there. The drop-down selections are just a handful of known sample rates.

Yes, but i couldnt change the sample rate to 192k. So the block seems not to negotiate / recognize the possible sample rates. So i asking myself how i could set the correct sample rate of 192k or how it could be detected and used by the audio sink automatically.

Andy
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From:	Andreas Ladanyi
Subject:	Re: [Discuss-gnuradio] Soundcards / alsa block / sample rates
Date:	Sat, 26 Sep 2015 18:48:36 +0200