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Hi Michael, If the USB sound device is on a hub, try plugging it directly to one of the computer's USB ports. Bandwidth reservation is also an issue, and generally there should be one active audio device per USB bus. Many, but not all, of the ports on a PC motherboard are their own USB bus, some of them can be ports on an internal hub. "lsusb" can help you figure out the topography. Additional USB cards are cheap if you have a desktop with slots free. Get the console output with the "dmesg" command (as root) and see if the driver complains. None of these USB interfaces are running at the exact same sample rate. This should not be a problem if the hardware is OK and your transmissions are in minutes rather than hours. Thanks Bruce On 06/26/2014 08:58 AM, Michael Hartje
wrote:
dear list, when i use freedv 0.96.6.beta (ubuntu saucy on a laptop) in a configuration, where I give the TX-out-signal back to the RX-Input, I can hear analog or digital feed through-signals. The Ubuntu saucy uses kernel 3.11. the internal soundcard is use to head the TRX, an USB-Soundcard is used for headphone and mic. The soundcard is a USB-SC with CM108 (cmedia).There is a smal time delay between direct speach to microphone and feed back audio from the speaker. This is for analog and for digital nearly the same delaytime. -- ok I think this is not dramatic and is the principle of digital signal processing. But after some ten seconds or after some time with loud microphone signals (Amplitude up to .8) i observe (in digtial and in analog feed through) a drastic increase of cpu usage from 30 to 35 % up to 65 and sometimes 77 %. On the audio output-signal at the same time there begins a stuttering signal If I use the USB-SC for TRX, in digital mode I get some errors -- the signal "frm radio" shows interruptions with the configuration USB-SC for headphone and mic, there are no errors, but the audio is stuttering as well. It seems to be no a freeDV-problem but an USB-Soundcard-problem. Are there any hints out there where to put screwdriver on the os or anywhere else? thanks Michael DK5HH ------------------------------------------------------------------------------ Open source business process management suite built on Java and Eclipse Turn processes into business applications with Bonita BPM Community Edition Quickly connect people, data, and systems into organized workflows Winner of BOSSIE, CODIE, OW2 and Gartner awards http://p.sf.net/sfu/Bonitasoft _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2 |
------------------------------------------------------------------------------ Open source business process management suite built on Java and Eclipse Turn processes into business applications with Bonita BPM Community Edition Quickly connect people, data, and systems into organized workflows Winner of BOSSIE, CODIE, OW2 and Gartner awards http://p.sf.net/sfu/Bonitasoft
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