Hey Giovanni, Thanks for your help.
You would be better served by an install that is exactly as in the wiki page.
OK, understood.
I've listened to the recordings, but I cannot hear bad sounds, just some noise at beginning of recording.
Yes, that's the strange sound I'm referring to. When I'm saying "a strange sound" I mean this noise at the beginning, not general sound quality using Gsmopen. In spite of having bad signal quality I find the overall sound quality of Gsmopen quite good! As I was saying, sometimes it's 1. not there ,2. only a hiss, 3. sometimes a loud screech.
How do you obtain those recordings? Eg: the exact procedure you use to produce those files?
These particular recordings were done with FS itself just to save me the trouble of hooking up a telephone recording device. Unfortunately my Android phone does not support call recording. The exact procedure was calling out through a Google Voice extension into the Gsmopen endpoint number. This was only done for the convince of recording. The sound happens regardless of how you call in. For instance, here is a recording I made through a POTS line using this device: http://www.radioshack.com/product/index.jsp?productId=2104040 http://hartmanncomputer.com/via-POTS.wav Thanks again! Peter Hartmann Hartmann Computer Consulting On Mon, Mar 4, 2013 at 5:03 AM, Giovanni Maruzzelli <gmaruzz@gmail.com> wrote:
On Mon, Mar 4, 2013 at 3:16 AM, Peter Hartmann <peter@hartmanncomputer.com> wrote:
I'm using Ubuntu 12.04-amd64. I have done some optimizations for Linux Audio and USB audio. These do seem to have improved the sound quality through the dongle but they haven't solved this weird sound problem on incoming calls. If anyone's interested, my tweaks were; using the lowlatency kernel and adding 'snd-usb-audio nrpacks=1' to my /etc/modules.
Hello,
you would better unload any *any* snd* module from kernel. mod_gsmopen do not use the audio subsystem at all, and those module can'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.
You would be better served by an install that is exactly as in the wiki page.
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).
Also, lowlatency kernel is not required or supported.
I've listened to the recordings, but I cannot hear bad sounds, just some noise at beginning of recording.
How do you obtain those recordings? Eg: the exact procedure you use to produce those files?
-giovanni
Has anyone experienced this sound?
Thanks much!
Peter Hartmann Hartmann Computer Consulting
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-- Sincerely,
Giovanni Maruzzelli Cell : +39-347-2665618
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