If you have a system where you drive the modulator directly and use txprelim=yes - then you already have limiting If not, and you are using "microphone audio" then you should un-comment txlimonly=yes it is quite possible to overdrive the URI and it sounds nasty when it happens. (You should check that the values for txtone and txvoice that you used in your audio calibration add up to a number less than 1000). GL Ken From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Keith Goobie Sent: Sunday, March 03, 2013 12:19 PM To: REDBUTTON_CTRL Cc: APP RPT Subject: Re: [App_rpt-users] Audio Clipping with IAXRPT / Web Transceiver Client Hi Jon Just checked the configs - All three appearances (we control three URI fobs) of txlinonly are commented out, do you know what the default is. Incoming audio from iaxrpt users seems OK, with no issues. Keith On 3/3/13 11:41 AM, "REDBUTTON_CTRL" <jrorke@cogeco.ca> wrote: Hi Kieth, In the usbradio.conf have you got the "txlinonly = yes'? This should limit TX audio coming from the URI. txlimonly=yes ; Audio limiting with no pre-emphasis on output channel: no,yes ; no - Audio is not limited. ; yes - Audio is limited. ; Suitable for transmitters with no limiting but with pre-emphasis. You can also tell the IAX users to cut back their mic gains. I would start here first. Like a lot of people on Echolink they dont have the computer set up properly. I find that head sets sound the best rather than using the internal mics on lapatops. I would leave the codec as Ulaw. dont bother with GSM, has crappy watery audio. Jon VA3RQ On 3/3/2013 11:31 AM, Keith Goobie wrote: Audio Clipping with IAXRPT / Web Transceiver Client Good day All. We have had our node up at VE3LSR / VE3UOR for a few months and we all have learned a lot about configuration and operation. It is ACID install and version id is 300.3. On our asterisk system, we support three nodes: 27211 - VE3UOR UHF repeater 29133 - VE3LSR coupled through a RLC-DSP404 controller (often connected to VE3UPS and VE3UHN), and 29154 - VA3LSR remote link for VE3LSR into VE3MUS - not too active - ad-hoc RF link. I have also been testing out iaxrpt and the WebTransceiver clients. I am on these systems and the results have been promising. I do notice some clipping on the audio on some stations. Initially I thought it was amplitude related - over-driving the URI-FOB, but I am now beginning to suspect that it may be network related and in my research I hear the term jitter being used - which if activated, adjust operation on the receiving end only. It may be that the system is not powered enough to drive the three uri-fobs. CPU show about 25% busy. [root@VE3LSR etc]# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping : 3 cpu MHz : 2992.898 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni monitor ds_cpl est cid cx16 xtpr bogomips : 5985.79 We do think that the system is sufficiently powered. We are looking for comments & guidance. Are we expecting too much from the system having three fobs connected? We do have good bandwidth into and out of the site. I am listening to other systems - most not to busy, so I am not yet able to get a good reference point. I have not dabbled with the codecs much, but have been focused on using ulaw. I am also testing with GSM - lower bandwidth. So as I said before, thoughts or suggestions are welcome. Keith / VA3YC -- keith@goobie.org Keith Goobie Richmond Hill, ON, CANADA _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users _____ _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users -- keith@goobie.org Keith Goobie Richmond Hill, ON, CANADA