On Mon, Mar 4, 2013 at 3:16 AM, Peter Hartmann <span dir="ltr">&lt;<a href="mailto:peter@hartmanncomputer.com" target="_blank">peter@hartmanncomputer.com</a>&gt;</span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<br>
I&#39;m using Ubuntu 12.04-amd64.  I have done some optimizations for<br>
Linux Audio and USB audio. These do seem to have improved the sound<br>
quality through the dongle but they haven&#39;t solved this weird sound<br>
problem on incoming calls.  If anyone&#39;s interested, my tweaks were;<br>
using the lowlatency kernel and adding &#39;snd-usb-audio nrpacks=1&#39; to my<br>
/etc/modules.<br>
<br></blockquote><div><br></div><div>Hello,</div><div><br></div><div>you would better unload any *any* snd* module from kernel. mod_gsmopen do not use the audio subsystem at all, and those module can&#39;t have a positive effect, quite possibly negative. mod_gsmopen has nothing to do with ALSA or OSS, and do not use sound at all.</div>

<div><br></div><div>You would be better served by an install that is exactly as in the wiki page.</div><div><br></div><div>mod_gsmopen exchange digital audio directly at sample level with the dongle, through the serial interface. That dongle is not seen as an audio card from the kernel, but as a modem (exactly as 4 modems).</div>

<div><br></div><div>Also, lowlatency kernel is not required or supported.</div><div><br></div><div>I&#39;ve listened to the recordings, but I cannot hear bad sounds, just some noise at beginning of recording. <br><br>How do you obtain those recordings? Eg: the exact procedure you use to produce those files?</div>

<div><br></div><div>-giovanni</div><div><br></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Has anyone experienced this sound?<br>
<br>
Thanks much!<br>
<br>
<br>
Peter Hartmann<br>
Hartmann Computer Consulting<br>
<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>Sincerely,<br><br>Giovanni Maruzzelli<br>Cell : +39-347-2665618<br>